* [hardknott][PATCH 5/9] gcc: Fix CVE-2021-42574
2022-01-11 14:32 [hardknott][PATCH 0/9] Patch review Anuj Mittal
` (3 preceding siblings ...)
2022-01-11 14:32 ` [hardknott][PATCH 4/9] grub2: fix CVE-2021-3981 Anuj Mittal
@ 2022-01-11 14:32 ` Anuj Mittal
2022-01-11 14:32 ` [hardknott][PATCH 6/9] busybox: backport patches to fix CVEs Anuj Mittal
` (3 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Anuj Mittal @ 2022-01-11 14:32 UTC (permalink / raw)
To: openembedded-core
From: pgowda <pgowda.cve@gmail.com>
Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=004bb936d6d5f177af26ad4905595e843d5665a5]
Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=bd5e882cf6e0def3dd1bc106075d59a303fe0d1e]
Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=51c500269bf53749b107807d84271385fad35628]
Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=1a7f2c0774129750fdf73e9f1b78f0ce983c9ab3]
Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=bef32d4a28595e933f24fef378cf052a30b674a7]
Signed-off-by: pgowda <pgowda.cve@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
---
meta/recipes-devtools/gcc/gcc-10.2.inc | 5 +
.../gcc/gcc/0001-CVE-2021-42574.patch | 2906 +++++++++++++++++
.../gcc/gcc/0002-CVE-2021-42574.patch | 2270 +++++++++++++
.../gcc/gcc/0003-CVE-2021-42574.patch | 1724 ++++++++++
.../gcc/gcc/0004-CVE-2021-42574.patch | 138 +
.../gcc/gcc/0005-CVE-2021-42574.patch | 575 ++++
6 files changed, 7618 insertions(+)
create mode 100644 meta/recipes-devtools/gcc/gcc/0001-CVE-2021-42574.patch
create mode 100644 meta/recipes-devtools/gcc/gcc/0002-CVE-2021-42574.patch
create mode 100644 meta/recipes-devtools/gcc/gcc/0003-CVE-2021-42574.patch
create mode 100644 meta/recipes-devtools/gcc/gcc/0004-CVE-2021-42574.patch
create mode 100644 meta/recipes-devtools/gcc/gcc/0005-CVE-2021-42574.patch
diff --git a/meta/recipes-devtools/gcc/gcc-10.2.inc b/meta/recipes-devtools/gcc/gcc-10.2.inc
index 89158258d7..656c43258c 100644
--- a/meta/recipes-devtools/gcc/gcc-10.2.inc
+++ b/meta/recipes-devtools/gcc/gcc-10.2.inc
@@ -75,6 +75,11 @@ SRC_URI = "\
file://0003-CVE-2021-35465.patch \
file://0004-CVE-2021-35465.patch \
file://0039-arm64-neoverse-n2-support.patch \
+ file://0001-CVE-2021-42574.patch \
+ file://0002-CVE-2021-42574.patch \
+ file://0003-CVE-2021-42574.patch \
+ file://0004-CVE-2021-42574.patch \
+ file://0005-CVE-2021-42574.patch \
"
SRC_URI[sha256sum] = "b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c"
diff --git a/meta/recipes-devtools/gcc/gcc/0001-CVE-2021-42574.patch b/meta/recipes-devtools/gcc/gcc/0001-CVE-2021-42574.patch
new file mode 100644
index 0000000000..e0f4f7d32f
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0001-CVE-2021-42574.patch
@@ -0,0 +1,2906 @@
+From 004bb936d6d5f177af26ad4905595e843d5665a5 Mon Sep 17 00:00:00 2001
+From: Lewis Hyatt <lhyatt@gmail.com>
+Date: Tue, 14 Jul 2020 12:05:56 -0400
+Subject: [PATCH] diagnostics: Support conversion of tabs to spaces [PR49973]
+ [PR86904]
+
+Supports conversion of tabs to spaces when outputting diagnostics. Also
+adds -fdiagnostics-column-unit and -fdiagnostics-column-origin options to
+control how the column number is output, thereby resolving the two PRs.
+
+gcc/c-family/ChangeLog:
+
+ PR other/86904
+ * c-indentation.c (should_warn_for_misleading_indentation): Get
+ global tabstop from the new source.
+ * c-opts.c (c_common_handle_option): Remove handling of -ftabstop, which
+ is now a common option.
+ * c.opt: Likewise.
+
+gcc/ChangeLog:
+
+ PR preprocessor/49973
+ PR other/86904
+ * common.opt: Handle -ftabstop here instead of in c-family
+ options. Add -fdiagnostics-column-unit= and
+ -fdiagnostics-column-origin= options.
+ * opts.c (common_handle_option): Handle the new options.
+ * diagnostic-format-json.cc (json_from_expanded_location): Add
+ diagnostic_context argument. Use it to convert column numbers as per
+ the new options.
+ (json_from_location_range): Likewise.
+ (json_from_fixit_hint): Likewise.
+ (json_end_diagnostic): Pass the new context argument to helper
+ functions above. Add "column-origin" field to the output.
+ (test_unknown_location): Add the new context argument to calls to
+ helper functions.
+ (test_bad_endpoints): Likewise.
+ * diagnostic-show-locus.c
+ (exploc_with_display_col::exploc_with_display_col): Support
+ tabstop parameter.
+ (layout_point::layout_point): Make use of class
+ exploc_with_display_col.
+ (layout_range::layout_range): Likewise.
+ (struct line_bounds): Clarify that the units are now always
+ display columns. Rename members accordingly. Add constructor.
+ (layout::print_source_line): Add support for tab expansion.
+ (make_range): Adapt to class layout_range changes.
+ (layout::maybe_add_location_range): Likewise.
+ (layout::layout): Adapt to class exploc_with_display_col changes.
+ (layout::calculate_x_offset_display): Support tabstop parameter.
+ (layout::print_annotation_line): Adapt to struct line_bounds changes.
+ (layout::print_line): Likewise.
+ (line_label::line_label): Add diagnostic_context argument.
+ (get_affected_range): Likewise.
+ (get_printed_columns): Likewise.
+ (layout::print_any_labels): Adapt to struct line_label changes.
+ (class correction): Add m_tabstop member.
+ (correction::correction): Add tabstop argument.
+ (correction::compute_display_cols): Use m_tabstop.
+ (class line_corrections): Add m_context member.
+ (line_corrections::line_corrections): Add diagnostic_context argument.
+ (line_corrections::add_hint): Use m_context to handle tabstops.
+ (layout::print_trailing_fixits): Adapt to class line_corrections
+ changes.
+ (test_layout_x_offset_display_utf8): Support tabstop parameter.
+ (test_layout_x_offset_display_tab): New selftest.
+ (test_one_liner_colorized_utf8): Likewise.
+ (test_tab_expansion): Likewise.
+ (test_diagnostic_show_locus_one_liner_utf8): Call the new tests.
+ (diagnostic_show_locus_c_tests): Likewise.
+ (test_overlapped_fixit_printing): Adapt to helper class and
+ function changes.
+ (test_overlapped_fixit_printing_utf8): Likewise.
+ (test_overlapped_fixit_printing_2): Likewise.
+ * diagnostic.h (enum diagnostics_column_unit): New enum.
+ (struct diagnostic_context): Add members for the new options.
+ (diagnostic_converted_column): Declare.
+ (json_from_expanded_location): Add new context argument.
+ * diagnostic.c (diagnostic_initialize): Initialize new members.
+ (diagnostic_converted_column): New function.
+ (maybe_line_and_column): Be willing to output a column of 0.
+ (diagnostic_get_location_text): Convert column number as per the new
+ options.
+ (diagnostic_report_current_module): Likewise.
+ (assert_location_text): Add origin and column_unit arguments for
+ testing the new functionality.
+ (test_diagnostic_get_location_text): Test the new functionality.
+ * doc/invoke.texi: Document the new options and behavior.
+ * input.h (location_compute_display_column): Add tabstop argument.
+ * input.c (location_compute_display_column): Likewise.
+ (test_cpp_utf8): Add selftests for tab expansion.
+ * tree-diagnostic-path.cc (default_tree_make_json_for_path): Pass the
+ new context argument to json_from_expanded_location().
+
+libcpp/ChangeLog:
+
+ PR preprocessor/49973
+ PR other/86904
+ * include/cpplib.h (struct cpp_options): Removed support for -ftabstop,
+ which is now handled by diagnostic_context.
+ (class cpp_display_width_computation): New class.
+ (cpp_byte_column_to_display_column): Add optional tabstop argument.
+ (cpp_display_width): Likewise.
+ (cpp_display_column_to_byte_column): Likewise.
+ * charset.c
+ (cpp_display_width_computation::cpp_display_width_computation): New
+ function.
+ (cpp_display_width_computation::advance_display_cols): Likewise.
+ (compute_next_display_width): Removed and implemented this
+ functionality in a new function...
+ (cpp_display_width_computation::process_next_codepoint): ...here.
+ (cpp_byte_column_to_display_column): Added tabstop argument.
+ Reimplemented in terms of class cpp_display_width_computation.
+ (cpp_display_column_to_byte_column): Likewise.
+ * init.c (cpp_create_reader): Remove handling of -ftabstop, which is now
+ handled by diagnostic_context.
+
+gcc/testsuite/ChangeLog:
+
+ PR preprocessor/49973
+ PR other/86904
+ * c-c++-common/Wmisleading-indentation-3.c: Adjust expected output
+ for new defaults.
+ * c-c++-common/Wmisleading-indentation.c: Likewise.
+ * c-c++-common/diagnostic-format-json-1.c: Likewise.
+ * c-c++-common/diagnostic-format-json-2.c: Likewise.
+ * c-c++-common/diagnostic-format-json-3.c: Likewise.
+ * c-c++-common/diagnostic-format-json-4.c: Likewise.
+ * c-c++-common/diagnostic-format-json-5.c: Likewise.
+ * c-c++-common/missing-close-symbol.c: Likewise.
+ * g++.dg/diagnostic/bad-binary-ops.C: Likewise.
+ * g++.dg/parse/error4.C: Likewise.
+ * g++.old-deja/g++.brendan/crash11.C: Likewise.
+ * g++.old-deja/g++.pt/overload2.C: Likewise.
+ * g++.old-deja/g++.robertl/eb109.C: Likewise.
+ * gcc.dg/analyzer/malloc-paths-9.c: Likewise.
+ * gcc.dg/bad-binary-ops.c: Likewise.
+ * gcc.dg/format/branch-1.c: Likewise.
+ * gcc.dg/format/pr79210.c: Likewise.
+ * gcc.dg/plugin/diagnostic-test-expressions-1.c: Likewise.
+ * gcc.dg/plugin/diagnostic-test-string-literals-1.c: Likewise.
+ * gcc.dg/redecl-4.c: Likewise.
+ * gfortran.dg/diagnostic-format-json-1.F90: Likewise.
+ * gfortran.dg/diagnostic-format-json-2.F90: Likewise.
+ * gfortran.dg/diagnostic-format-json-3.F90: Likewise.
+ * go.dg/arrayclear.go: Add a comment explaining why adding a
+ comment was necessary to work around a dejagnu bug.
+ * c-c++-common/diagnostic-units-1.c: New test.
+ * c-c++-common/diagnostic-units-2.c: New test.
+ * c-c++-common/diagnostic-units-3.c: New test.
+ * c-c++-common/diagnostic-units-4.c: New test.
+ * c-c++-common/diagnostic-units-5.c: New test.
+ * c-c++-common/diagnostic-units-6.c: New test.
+ * c-c++-common/diagnostic-units-7.c: New test.
+ * c-c++-common/diagnostic-units-8.c: New test.
+
+CVE: CVE-2021-42574
+Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=004bb936d6d5f177af26ad4905595e843d5665a5]
+Signed-off-by: Pgowda <pgowda.cve@gmail.com>
+---
+ gcc/c-family/c-indentation.c | 5 +-
+ gcc/c-family/c-opts.c | 6 -
+ gcc/c-family/c.opt | 4 -
+ gcc/common.opt | 21 +
+ gcc/diagnostic-format-json.cc | 55 +-
+ gcc/diagnostic-show-locus.c | 504 +++++++++++++-----
+ gcc/diagnostic.c | 113 +++-
+ gcc/diagnostic.h | 28 +-
+ gcc/doc/invoke.texi | 68 ++-
+ gcc/input.c | 72 ++-
+ gcc/input.h | 4 +-
+ gcc/opts.c | 14 +
+ .../c-c++-common/Wmisleading-indentation-3.c | 12 +-
+ .../c-c++-common/Wmisleading-indentation.c | 6 +-
+ .../c-c++-common/diagnostic-format-json-1.c | 5 +
+ .../c-c++-common/diagnostic-format-json-2.c | 5 +
+ .../c-c++-common/diagnostic-format-json-3.c | 5 +
+ .../c-c++-common/diagnostic-format-json-4.c | 9 +
+ .../c-c++-common/diagnostic-format-json-5.c | 9 +
+ .../c-c++-common/diagnostic-units-1.c | 28 +
+ .../c-c++-common/diagnostic-units-2.c | 28 +
+ .../c-c++-common/diagnostic-units-3.c | 28 +
+ .../c-c++-common/diagnostic-units-4.c | 28 +
+ .../c-c++-common/diagnostic-units-5.c | 28 +
+ .../c-c++-common/diagnostic-units-6.c | 28 +
+ .../c-c++-common/diagnostic-units-7.c | 28 +
+ .../c-c++-common/diagnostic-units-8.c | 28 +
+ .../c-c++-common/missing-close-symbol.c | 6 +-
+ .../g++.dg/diagnostic/bad-binary-ops.C | 8 +-
+ gcc/testsuite/g++.dg/parse/error4.C | 2 +-
+ .../g++.old-deja/g++.brendan/crash11.C | 4 +-
+ gcc/testsuite/g++.old-deja/g++.pt/overload2.C | 2 +-
+ .../g++.old-deja/g++.robertl/eb109.C | 4 +-
+ .../gcc.dg/analyzer/malloc-paths-9.c | 2 +-
+ gcc/testsuite/gcc.dg/bad-binary-ops.c | 8 +-
+ gcc/testsuite/gcc.dg/format/branch-1.c | 2 +-
+ gcc/testsuite/gcc.dg/format/pr79210.c | 2 +-
+ .../plugin/diagnostic-test-expressions-1.c | 16 +-
+ .../diagnostic-test-string-literals-1.c | 4 +-
+ gcc/testsuite/gcc.dg/redecl-4.c | 2 +-
+ .../gfortran.dg/diagnostic-format-json-1.F90 | 5 +
+ .../gfortran.dg/diagnostic-format-json-2.F90 | 5 +
+ .../gfortran.dg/diagnostic-format-json-3.F90 | 5 +
+ gcc/testsuite/go.dg/arrayclear.go | 3 +
+ gcc/tree-diagnostic-path.cc | 5 +-
+ libcpp/charset.c | 98 ++--
+ libcpp/include/cpplib.h | 40 +-
+ libcpp/init.c | 1 -
+ 48 files changed, 1106 insertions(+), 287 deletions(-)
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-1.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-2.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-3.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-4.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-5.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-6.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-7.c
+ create mode 100644 gcc/testsuite/c-c++-common/diagnostic-units-8.c
+
+diff --git a/gcc/c-family/c-indentation.c b/gcc/c-family/c-indentation.c
+--- a/gcc/c-family/c-indentation.c 2020-07-22 23:35:17.296384022 -0700
++++ b/gcc/c-family/c-indentation.c 2021-12-25 01:20:53.475636694 -0800
+@@ -24,8 +24,7 @@ along with GCC; see the file COPYING3.
+ #include "c-common.h"
+ #include "c-indentation.h"
+ #include "selftest.h"
+-
+-extern cpp_options *cpp_opts;
++#include "diagnostic.h"
+
+ /* Round up VIS_COLUMN to nearest tab stop. */
+
+@@ -294,7 +293,7 @@ should_warn_for_misleading_indentation (
+ expanded_location next_stmt_exploc = expand_location (next_stmt_loc);
+ expanded_location guard_exploc = expand_location (guard_loc);
+
+- const unsigned int tab_width = cpp_opts->tabstop;
++ const unsigned int tab_width = global_dc->tabstop;
+
+ /* They must be in the same file. */
+ if (next_stmt_exploc.file != body_exploc.file)
+diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
+--- a/gcc/c-family/c.opt 2021-12-24 20:23:42.816809230 -0800
++++ b/gcc/c-family/c.opt 2021-12-25 01:20:53.475636694 -0800
+@@ -1876,10 +1876,6 @@ Enum(strong_eval_order) String(some) Val
+ EnumValue
+ Enum(strong_eval_order) String(all) Value(2)
+
+-ftabstop=
+-C ObjC C++ ObjC++ Joined RejectNegative UInteger
+--ftabstop=<number> Distance between tab stops for column reporting.
+-
+ ftemplate-backtrace-limit=
+ C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
+ Set the maximum number of template instantiation notes for a single warning or error.
+diff --git a/gcc/c-family/c-opts.c b/gcc/c-family/c-opts.c
+--- a/gcc/c-family/c-opts.c 2021-12-24 20:23:44.824774786 -0800
++++ b/gcc/c-family/c-opts.c 2021-12-25 01:20:53.475636694 -0800
+@@ -504,12 +504,6 @@ c_common_handle_option (size_t scode, co
+ cpp_opts->track_macro_expansion = 2;
+ break;
+
+- case OPT_ftabstop_:
+- /* It is documented that we silently ignore silly values. */
+- if (value >= 1 && value <= 100)
+- cpp_opts->tabstop = value;
+- break;
+-
+ case OPT_fexec_charset_:
+ cpp_opts->narrow_charset = arg;
+ break;
+diff --git a/gcc/common.opt b/gcc/common.opt
+--- a/gcc/common.opt 2021-12-24 20:23:42.480814993 -0800
++++ b/gcc/common.opt 2021-12-25 01:20:53.475636694 -0800
+@@ -1325,6 +1325,14 @@ Enum(diagnostic_url_rule) String(always)
+ EnumValue
+ Enum(diagnostic_url_rule) String(auto) Value(DIAGNOSTICS_URL_AUTO)
+
++fdiagnostics-column-unit=
++Common Joined RejectNegative Enum(diagnostics_column_unit)
++-fdiagnostics-column-unit=[display|byte] Select whether column numbers are output as display columns (default) or raw bytes.
++
++fdiagnostics-column-origin=
++Common Joined RejectNegative UInteger
++-fdiagnostics-column-origin=<number> Set the number of the first column. The default is 1-based as per GNU style, but some utilities may expect 0-based, for example.
++
+ fdiagnostics-format=
+ Common Joined RejectNegative Enum(diagnostics_output_format)
+ -fdiagnostics-format=[text|json] Select output format.
+@@ -1334,6 +1342,15 @@ SourceInclude
+ diagnostic.h
+
+ Enum
++Name(diagnostics_column_unit) Type(int)
++
++EnumValue
++Enum(diagnostics_column_unit) String(display) Value(DIAGNOSTICS_COLUMN_UNIT_DISPLAY)
++
++EnumValue
++Enum(diagnostics_column_unit) String(byte) Value(DIAGNOSTICS_COLUMN_UNIT_BYTE)
++
++Enum
+ Name(diagnostics_output_format) Type(int)
+
+ EnumValue
+@@ -1362,6 +1379,10 @@ fdiagnostics-path-format=
+ Common Joined RejectNegative Var(flag_diagnostics_path_format) Enum(diagnostic_path_format) Init(DPF_INLINE_EVENTS)
+ Specify how to print any control-flow path associated with a diagnostic.
+
++ftabstop=
++Common Joined RejectNegative UInteger
++-ftabstop=<number> Distance between tab stops for column reporting.
++
+ Enum
+ Name(diagnostic_path_format) Type(int)
+
+diff --git a/gcc/diagnostic.c b/gcc/diagnostic.c
+--- a/gcc/diagnostic.c 2020-07-22 23:35:17.556386887 -0700
++++ b/gcc/diagnostic.c 2021-12-25 01:23:41.300841207 -0800
+@@ -38,6 +38,7 @@ along with GCC; see the file COPYING3.
+ #include "selftest.h"
+ #include "selftest-diagnostic.h"
+ #include "opts.h"
++#include "cpplib.h"
+
+ #ifdef HAVE_TERMIOS_H
+ # include <termios.h>
+@@ -219,6 +220,9 @@ diagnostic_initialize (diagnostic_contex
+ context->min_margin_width = 0;
+ context->show_ruler_p = false;
+ context->parseable_fixits_p = false;
++ context->column_unit = DIAGNOSTICS_COLUMN_UNIT_DISPLAY;
++ context->column_origin = 1;
++ context->tabstop = 8;
+ context->edit_context_ptr = NULL;
+ context->diagnostic_group_nesting_depth = 0;
+ context->diagnostic_group_emission_count = 0;
+@@ -353,8 +357,51 @@ diagnostic_get_color_for_kind (diagnosti
+ return diagnostic_kind_color[kind];
+ }
+
++/* Given an expanded_location, convert the column (which is in 1-based bytes)
++ to the requested units, without converting the origin.
++ Return -1 if the column is invalid (<= 0). */
++
++static int
++convert_column_unit (enum diagnostics_column_unit column_unit,
++ int tabstop,
++ expanded_location s)
++{
++ if (s.column <= 0)
++ return -1;
++
++ switch (column_unit)
++ {
++ default:
++ gcc_unreachable ();
++
++ case DIAGNOSTICS_COLUMN_UNIT_DISPLAY:
++ {
++ cpp_char_column_policy policy (tabstop, cpp_wcwidth);
++ return location_compute_display_column (s, policy);
++ }
++
++ case DIAGNOSTICS_COLUMN_UNIT_BYTE:
++ return s.column;
++ }
++}
++
++/* Given an expanded_location, convert the column (which is in 1-based bytes)
++ to the requested units and origin. Return -1 if the column is
++ invalid (<= 0). */
++int
++diagnostic_converted_column (diagnostic_context *context, expanded_location s)
++{
++ int one_based_col
++ = convert_column_unit (context->column_unit, context->tabstop, s);
++ if (one_based_col <= 0)
++ return -1;
++ return one_based_col + (context->column_origin - 1);
++}
++
+ /* Return a formatted line and column ':%line:%column'. Elided if
+- zero. The result is a statically allocated buffer. */
++ line == 0 or col < 0. (A column of 0 may be valid due to the
++ -fdiagnostics-column-origin option.)
++ The result is a statically allocated buffer. */
+
+ static const char *
+ maybe_line_and_column (int line, int col)
+@@ -363,8 +410,9 @@ maybe_line_and_column (int line, int col
+
+ if (line)
+ {
+- size_t l = snprintf (result, sizeof (result),
+- col ? ":%d:%d" : ":%d", line, col);
++ size_t l
++ = snprintf (result, sizeof (result),
++ col >= 0 ? ":%d:%d" : ":%d", line, col);
+ gcc_checking_assert (l < sizeof (result));
+ }
+ else
+@@ -383,8 +431,14 @@ diagnostic_get_location_text (diagnostic
+ const char *locus_cs = colorize_start (pp_show_color (pp), "locus");
+ const char *locus_ce = colorize_stop (pp_show_color (pp));
+ const char *file = s.file ? s.file : progname;
+- int line = strcmp (file, N_("<built-in>")) ? s.line : 0;
+- int col = context->show_column ? s.column : 0;
++ int line = 0;
++ int col = -1;
++ if (strcmp (file, N_("<built-in>")))
++ {
++ line = s.line;
++ if (context->show_column)
++ col = diagnostic_converted_column (context, s);
++ }
+
+ const char *line_col = maybe_line_and_column (line, col);
+ return build_message_string ("%s%s%s:%s", locus_cs, file,
+@@ -650,14 +704,20 @@ diagnostic_report_current_module (diagno
+ if (! MAIN_FILE_P (map))
+ {
+ bool first = true;
++ expanded_location s = {};
+ do
+ {
+ where = linemap_included_from (map);
+ map = linemap_included_from_linemap (line_table, map);
+- const char *line_col
+- = maybe_line_and_column (SOURCE_LINE (map, where),
+- first && context->show_column
+- ? SOURCE_COLUMN (map, where) : 0);
++ s.file = LINEMAP_FILE (map);
++ s.line = SOURCE_LINE (map, where);
++ int col = -1;
++ if (first && context->show_column)
++ {
++ s.column = SOURCE_COLUMN (map, where);
++ col = diagnostic_converted_column (context, s);
++ }
++ const char *line_col = maybe_line_and_column (s.line, col);
+ static const char *const msgs[] =
+ {
+ N_("In file included from"),
+@@ -666,7 +726,7 @@ diagnostic_report_current_module (diagno
+ unsigned index = !first;
+ pp_verbatim (context->printer, "%s%s %r%s%s%R",
+ first ? "" : ",\n", _(msgs[index]),
+- "locus", LINEMAP_FILE (map), line_col);
++ "locus", s.file, line_col);
+ first = false;
+ }
+ while (! MAIN_FILE_P (map));
+@@ -2042,10 +2102,15 @@ test_print_parseable_fixits_replace ()
+ static void
+ assert_location_text (const char *expected_loc_text,
+ const char *filename, int line, int column,
+- bool show_column)
++ bool show_column,
++ int origin = 1,
++ enum diagnostics_column_unit column_unit
++ = DIAGNOSTICS_COLUMN_UNIT_BYTE)
+ {
+ test_diagnostic_context dc;
+ dc.show_column = show_column;
++ dc.column_unit = column_unit;
++ dc.column_origin = origin;
+
+ expanded_location xloc;
+ xloc.file = filename;
+@@ -2069,7 +2134,10 @@ test_diagnostic_get_location_text ()
+ assert_location_text ("PROGNAME:", NULL, 0, 0, true);
+ assert_location_text ("<built-in>:", "<built-in>", 42, 10, true);
+ assert_location_text ("foo.c:42:10:", "foo.c", 42, 10, true);
+- assert_location_text ("foo.c:42:", "foo.c", 42, 0, true);
++ assert_location_text ("foo.c:42:9:", "foo.c", 42, 10, true, 0);
++ assert_location_text ("foo.c:42:1010:", "foo.c", 42, 10, true, 1001);
++ for (int origin = 0; origin != 2; ++origin)
++ assert_location_text ("foo.c:42:", "foo.c", 42, 0, true, origin);
+ assert_location_text ("foo.c:", "foo.c", 0, 10, true);
+ assert_location_text ("foo.c:42:", "foo.c", 42, 10, false);
+ assert_location_text ("foo.c:", "foo.c", 0, 10, false);
+@@ -2077,6 +2145,41 @@ test_diagnostic_get_location_text ()
+ maybe_line_and_column (INT_MAX, INT_MAX);
+ maybe_line_and_column (INT_MIN, INT_MIN);
+
++ {
++ /* In order to test display columns vs byte columns, we need to create a
++ file for location_get_source_line() to read. */
++
++ const char *const content = "smile \xf0\x9f\x98\x82\n";
++ const int line_bytes = strlen (content) - 1;
++ const int def_tabstop = 8;
++ const int display_width = cpp_display_width (content, line_bytes,
++ def_tabstop);
++ ASSERT_EQ (line_bytes - 2, display_width);
++ temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
++ const char *const fname = tmp.get_filename ();
++ const int buf_len = strlen (fname) + 16;
++ char *const expected = XNEWVEC (char, buf_len);
++
++ snprintf (expected, buf_len, "%s:1:%d:", fname, line_bytes);
++ assert_location_text (expected, fname, 1, line_bytes, true,
++ 1, DIAGNOSTICS_COLUMN_UNIT_BYTE);
++
++ snprintf (expected, buf_len, "%s:1:%d:", fname, line_bytes - 1);
++ assert_location_text (expected, fname, 1, line_bytes, true,
++ 0, DIAGNOSTICS_COLUMN_UNIT_BYTE);
++
++ snprintf (expected, buf_len, "%s:1:%d:", fname, display_width);
++ assert_location_text (expected, fname, 1, line_bytes, true,
++ 1, DIAGNOSTICS_COLUMN_UNIT_DISPLAY);
++
++ snprintf (expected, buf_len, "%s:1:%d:", fname, display_width - 1);
++ assert_location_text (expected, fname, 1, line_bytes, true,
++ 0, DIAGNOSTICS_COLUMN_UNIT_DISPLAY);
++
++ XDELETEVEC (expected);
++ }
++
++
+ progname = old_progname;
+ }
+
+diff --git a/gcc/diagnostic-format-json.cc b/gcc/diagnostic-format-json.cc
+--- a/gcc/diagnostic-format-json.cc 2020-07-22 23:35:17.556386887 -0700
++++ b/gcc/diagnostic-format-json.cc 2021-12-25 01:20:53.475636694 -0800
+@@ -23,6 +23,7 @@ along with GCC; see the file COPYING3.
+ #include "system.h"
+ #include "coretypes.h"
+ #include "diagnostic.h"
++#include "selftest-diagnostic.h"
+ #include "diagnostic-metadata.h"
+ #include "json.h"
+ #include "selftest.h"
+@@ -43,21 +44,43 @@ static json::array *cur_children_array;
+ /* Generate a JSON object for LOC. */
+
+ json::value *
+-json_from_expanded_location (location_t loc)
++json_from_expanded_location (diagnostic_context *context, location_t loc)
+ {
+ expanded_location exploc = expand_location (loc);
+ json::object *result = new json::object ();
+ if (exploc.file)
+ result->set ("file", new json::string (exploc.file));
+ result->set ("line", new json::integer_number (exploc.line));
+- result->set ("column", new json::integer_number (exploc.column));
++
++ const enum diagnostics_column_unit orig_unit = context->column_unit;
++ struct
++ {
++ const char *name;
++ enum diagnostics_column_unit unit;
++ } column_fields[] = {
++ {"display-column", DIAGNOSTICS_COLUMN_UNIT_DISPLAY},
++ {"byte-column", DIAGNOSTICS_COLUMN_UNIT_BYTE}
++ };
++ int the_column = INT_MIN;
++ for (int i = 0; i != sizeof column_fields / sizeof (*column_fields); ++i)
++ {
++ context->column_unit = column_fields[i].unit;
++ const int col = diagnostic_converted_column (context, exploc);
++ result->set (column_fields[i].name, new json::integer_number (col));
++ if (column_fields[i].unit == orig_unit)
++ the_column = col;
++ }
++ gcc_assert (the_column != INT_MIN);
++ result->set ("column", new json::integer_number (the_column));
++ context->column_unit = orig_unit;
+ return result;
+ }
+
+ /* Generate a JSON object for LOC_RANGE. */
+
+ static json::object *
+-json_from_location_range (const location_range *loc_range, unsigned range_idx)
++json_from_location_range (diagnostic_context *context,
++ const location_range *loc_range, unsigned range_idx)
+ {
+ location_t caret_loc = get_pure_location (loc_range->m_loc);
+
+@@ -68,13 +91,13 @@ json_from_location_range (const location
+ location_t finish_loc = get_finish (loc_range->m_loc);
+
+ json::object *result = new json::object ();
+- result->set ("caret", json_from_expanded_location (caret_loc));
++ result->set ("caret", json_from_expanded_location (context, caret_loc));
+ if (start_loc != caret_loc
+ && start_loc != UNKNOWN_LOCATION)
+- result->set ("start", json_from_expanded_location (start_loc));
++ result->set ("start", json_from_expanded_location (context, start_loc));
+ if (finish_loc != caret_loc
+ && finish_loc != UNKNOWN_LOCATION)
+- result->set ("finish", json_from_expanded_location (finish_loc));
++ result->set ("finish", json_from_expanded_location (context, finish_loc));
+
+ if (loc_range->m_label)
+ {
+@@ -91,14 +114,14 @@ json_from_location_range (const location
+ /* Generate a JSON object for HINT. */
+
+ static json::object *
+-json_from_fixit_hint (const fixit_hint *hint)
++json_from_fixit_hint (diagnostic_context *context, const fixit_hint *hint)
+ {
+ json::object *fixit_obj = new json::object ();
+
+ location_t start_loc = hint->get_start_loc ();
+- fixit_obj->set ("start", json_from_expanded_location (start_loc));
++ fixit_obj->set ("start", json_from_expanded_location (context, start_loc));
+ location_t next_loc = hint->get_next_loc ();
+- fixit_obj->set ("next", json_from_expanded_location (next_loc));
++ fixit_obj->set ("next", json_from_expanded_location (context, next_loc));
+ fixit_obj->set ("string", new json::string (hint->get_string ()));
+
+ return fixit_obj;
+@@ -190,11 +213,13 @@ json_end_diagnostic (diagnostic_context
+ else
+ {
+ /* Otherwise, make diag_obj be the top-level object within the group;
+- add a "children" array. */
++ add a "children" array and record the column origin. */
+ toplevel_array->append (diag_obj);
+ cur_group = diag_obj;
+ cur_children_array = new json::array ();
+ diag_obj->set ("children", cur_children_array);
++ diag_obj->set ("column-origin",
++ new json::integer_number (context->column_origin));
+ }
+
+ const rich_location *richloc = diagnostic->richloc;
+@@ -205,7 +230,7 @@ json_end_diagnostic (diagnostic_context
+ for (unsigned int i = 0; i < richloc->get_num_locations (); i++)
+ {
+ const location_range *loc_range = richloc->get_range (i);
+- json::object *loc_obj = json_from_location_range (loc_range, i);
++ json::object *loc_obj = json_from_location_range (context, loc_range, i);
+ if (loc_obj)
+ loc_array->append (loc_obj);
+ }
+@@ -217,7 +242,7 @@ json_end_diagnostic (diagnostic_context
+ for (unsigned int i = 0; i < richloc->get_num_fixit_hints (); i++)
+ {
+ const fixit_hint *hint = richloc->get_fixit_hint (i);
+- json::object *fixit_obj = json_from_fixit_hint (hint);
++ json::object *fixit_obj = json_from_fixit_hint (context, hint);
+ fixit_array->append (fixit_obj);
+ }
+ }
+@@ -320,7 +345,8 @@ namespace selftest {
+ static void
+ test_unknown_location ()
+ {
+- delete json_from_expanded_location (UNKNOWN_LOCATION);
++ test_diagnostic_context dc;
++ delete json_from_expanded_location (&dc, UNKNOWN_LOCATION);
+ }
+
+ /* Verify that we gracefully handle attempts to serialize bad
+@@ -338,7 +364,8 @@ test_bad_endpoints ()
+ loc_range.m_range_display_kind = SHOW_RANGE_WITH_CARET;
+ loc_range.m_label = NULL;
+
+- json::object *obj = json_from_location_range (&loc_range, 0);
++ test_diagnostic_context dc;
++ json::object *obj = json_from_location_range (&dc, &loc_range, 0);
+ /* We should have a "caret" value, but no "start" or "finish" values. */
+ ASSERT_TRUE (obj != NULL);
+ ASSERT_TRUE (obj->get ("caret") != NULL);
+diff --git a/gcc/diagnostic.h b/gcc/diagnostic.h
+--- a/gcc/diagnostic.h 2020-07-22 23:35:17.556386887 -0700
++++ b/gcc/diagnostic.h 2021-12-25 01:20:53.479636627 -0800
+@@ -24,6 +24,20 @@ along with GCC; see the file COPYING3.
+ #include "pretty-print.h"
+ #include "diagnostic-core.h"
+
++/* An enum for controlling what units to use for the column number
++ when diagnostics are output, used by the -fdiagnostics-column-unit option.
++ Tabs will be expanded or not according to the value of -ftabstop. The origin
++ (default 1) is controlled by -fdiagnostics-column-origin. */
++
++enum diagnostics_column_unit
++{
++ /* The default from GCC 11 onwards: display columns. */
++ DIAGNOSTICS_COLUMN_UNIT_DISPLAY,
++
++ /* The behavior in GCC 10 and earlier: simple bytes. */
++ DIAGNOSTICS_COLUMN_UNIT_BYTE
++};
++
+ /* Enum for overriding the standard output format. */
+
+ enum diagnostics_output_format
+@@ -280,6 +294,15 @@ struct diagnostic_context
+ rest of the diagnostic. */
+ bool parseable_fixits_p;
+
++ /* What units to use when outputting the column number. */
++ enum diagnostics_column_unit column_unit;
++
++ /* The origin for the column number (1-based or 0-based typically). */
++ int column_origin;
++
++ /* The size of the tabstop for tab expansion. */
++ int tabstop;
++
+ /* If non-NULL, an edit_context to which fix-it hints should be
+ applied, for generating patches. */
+ edit_context *edit_context_ptr;
+@@ -458,6 +481,8 @@ diagnostic_same_line (const diagnostic_c
+ }
+
+ extern const char *diagnostic_get_color_for_kind (diagnostic_t kind);
++extern int diagnostic_converted_column (diagnostic_context *context,
++ expanded_location s);
+
+ /* Pure text formatting support functions. */
+ extern char *file_name_as_prefix (diagnostic_context *, const char *);
+@@ -470,6 +495,7 @@ extern void diagnostic_output_format_ini
+ /* Compute the number of digits in the decimal representation of an integer. */
+ extern int num_digits (int);
+
+-extern json::value *json_from_expanded_location (location_t loc);
++extern json::value *json_from_expanded_location (diagnostic_context *context,
++ location_t loc);
+
+ #endif /* ! GCC_DIAGNOSTIC_H */
+diff --git a/gcc/diagnostic-show-locus.c b/gcc/diagnostic-show-locus.c
+--- a/gcc/diagnostic-show-locus.c 2020-07-22 23:35:17.556386887 -0700
++++ b/gcc/diagnostic-show-locus.c 2021-12-25 01:20:53.479636627 -0800
+@@ -175,9 +175,10 @@ enum column_unit {
+ class exploc_with_display_col : public expanded_location
+ {
+ public:
+- exploc_with_display_col (const expanded_location &exploc)
++ exploc_with_display_col (const expanded_location &exploc, int tabstop)
+ : expanded_location (exploc),
+- m_display_col (location_compute_display_column (exploc)) {}
++ m_display_col (location_compute_display_column (exploc, tabstop))
++ {}
+
+ int m_display_col;
+ };
+@@ -189,11 +190,11 @@ class exploc_with_display_col : public e
+ class layout_point
+ {
+ public:
+- layout_point (const expanded_location &exploc)
++ layout_point (const exploc_with_display_col &exploc)
+ : m_line (exploc.line)
+ {
+ m_columns[CU_BYTES] = exploc.column;
+- m_columns[CU_DISPLAY_COLS] = location_compute_display_column (exploc);
++ m_columns[CU_DISPLAY_COLS] = exploc.m_display_col;
+ }
+
+ linenum_type m_line;
+@@ -205,10 +206,10 @@ class layout_point
+ class layout_range
+ {
+ public:
+- layout_range (const expanded_location *start_exploc,
+- const expanded_location *finish_exploc,
++ layout_range (const exploc_with_display_col &start_exploc,
++ const exploc_with_display_col &finish_exploc,
+ enum range_display_kind range_display_kind,
+- const expanded_location *caret_exploc,
++ const exploc_with_display_col &caret_exploc,
+ unsigned original_idx,
+ const range_label *label);
+
+@@ -226,22 +227,18 @@ class layout_range
+
+ /* A struct for use by layout::print_source_line for telling
+ layout::print_annotation_line the extents of the source line that
+- it printed, so that underlines can be clipped appropriately. */
++ it printed, so that underlines can be clipped appropriately. Units
++ are 1-based display columns. */
+
+ struct line_bounds
+ {
+- int m_first_non_ws;
+- int m_last_non_ws;
++ int m_first_non_ws_disp_col;
++ int m_last_non_ws_disp_col;
+
+- void convert_to_display_cols (char_span line)
++ line_bounds ()
+ {
+- m_first_non_ws = cpp_byte_column_to_display_column (line.get_buffer (),
+- line.length (),
+- m_first_non_ws);
+-
+- m_last_non_ws = cpp_byte_column_to_display_column (line.get_buffer (),
+- line.length (),
+- m_last_non_ws);
++ m_first_non_ws_disp_col = INT_MAX;
++ m_last_non_ws_disp_col = 0;
+ }
+ };
+
+@@ -351,8 +348,8 @@ class layout
+ private:
+ bool will_show_line_p (linenum_type row) const;
+ void print_leading_fixits (linenum_type row);
+- void print_source_line (linenum_type row, const char *line, int line_bytes,
+- line_bounds *lbounds_out);
++ line_bounds print_source_line (linenum_type row, const char *line,
++ int line_bytes);
+ bool should_print_annotation_line_p (linenum_type row) const;
+ void start_annotation_line (char margin_char = ' ') const;
+ void print_annotation_line (linenum_type row, const line_bounds lbounds);
+@@ -513,16 +510,16 @@ colorizer::get_color_by_name (const char
+ Initialize various layout_point fields from expanded_location
+ equivalents; we've already filtered on file. */
+
+-layout_range::layout_range (const expanded_location *start_exploc,
+- const expanded_location *finish_exploc,
++layout_range::layout_range (const exploc_with_display_col &start_exploc,
++ const exploc_with_display_col &finish_exploc,
+ enum range_display_kind range_display_kind,
+- const expanded_location *caret_exploc,
++ const exploc_with_display_col &caret_exploc,
+ unsigned original_idx,
+ const range_label *label)
+-: m_start (*start_exploc),
+- m_finish (*finish_exploc),
++: m_start (start_exploc),
++ m_finish (finish_exploc),
+ m_range_display_kind (range_display_kind),
+- m_caret (*caret_exploc),
++ m_caret (caret_exploc),
+ m_original_idx (original_idx),
+ m_label (label)
+ {
+@@ -646,6 +643,9 @@ layout_range::intersects_line_p (linenum
+
+ #if CHECKING_P
+
++/* Default for when we don't care what the tab expansion is set to. */
++static const int def_tabstop = 8;
++
+ /* Create some expanded locations for testing layout_range. The filename
+ member of the explocs is set to the empty string. This member will only be
+ inspected by the calls to location_compute_display_column() made from the
+@@ -662,8 +662,11 @@ make_range (int start_line, int start_co
+ = {"", start_line, start_col, NULL, false};
+ const expanded_location finish_exploc
+ = {"", end_line, end_col, NULL, false};
+- return layout_range (&start_exploc, &finish_exploc, SHOW_RANGE_WITHOUT_CARET,
+- &start_exploc, 0, NULL);
++ return layout_range (exploc_with_display_col (start_exploc, def_tabstop),
++ exploc_with_display_col (finish_exploc, def_tabstop),
++ SHOW_RANGE_WITHOUT_CARET,
++ exploc_with_display_col (start_exploc, def_tabstop),
++ 0, NULL);
+ }
+
+ /* Selftests for layout_range::contains_point and
+@@ -964,7 +967,7 @@ layout::layout (diagnostic_context * con
+ : m_context (context),
+ m_pp (context->printer),
+ m_primary_loc (richloc->get_range (0)->m_loc),
+- m_exploc (richloc->get_expanded_location (0)),
++ m_exploc (richloc->get_expanded_location (0), context->tabstop),
+ m_colorizer (context, diagnostic_kind),
+ m_colorize_source_p (context->colorize_source_p),
+ m_show_labels_p (context->show_labels_p),
+@@ -1060,7 +1063,10 @@ layout::maybe_add_location_range (const
+
+ /* Everything is now known to be in the correct source file,
+ but it may require further sanitization. */
+- layout_range ri (&start, &finish, loc_range->m_range_display_kind, &caret,
++ layout_range ri (exploc_with_display_col (start, m_context->tabstop),
++ exploc_with_display_col (finish, m_context->tabstop),
++ loc_range->m_range_display_kind,
++ exploc_with_display_col (caret, m_context->tabstop),
+ original_idx, loc_range->m_label);
+
+ /* If we have a range that finishes before it starts (perhaps
+@@ -1394,7 +1400,7 @@ layout::calculate_x_offset_display ()
+ = get_line_bytes_without_trailing_whitespace (line.get_buffer (),
+ line.length ());
+ int eol_display_column
+- = cpp_display_width (line.get_buffer (), line_bytes);
++ = cpp_display_width (line.get_buffer (), line_bytes, m_context->tabstop);
+ if (caret_display_column > eol_display_column
+ || !caret_display_column)
+ {
+@@ -1445,16 +1451,13 @@ layout::calculate_x_offset_display ()
+ }
+
+ /* Print line ROW of source code, potentially colorized at any ranges, and
+- populate *LBOUNDS_OUT.
+- LINE is the source line (not necessarily 0-terminated) and LINE_BYTES
+- is its length in bytes.
+- This function deals only with byte offsets, not display columns, so
+- m_x_offset_display must be converted from display to byte units. In
+- particular, LINE_BYTES and LBOUNDS_OUT are in bytes. */
++ return the line bounds. LINE is the source line (not necessarily
++ 0-terminated) and LINE_BYTES is its length in bytes. In order to handle both
++ colorization and tab expansion, this function tracks the line position in
++ both byte and display column units. */
+
+-void
+-layout::print_source_line (linenum_type row, const char *line, int line_bytes,
+- line_bounds *lbounds_out)
++line_bounds
++layout::print_source_line (linenum_type row, const char *line, int line_bytes)
+ {
+ m_colorizer.set_normal_text ();
+
+@@ -1469,30 +1472,29 @@ layout::print_source_line (linenum_type
+ else
+ pp_space (m_pp);
+
+- /* We will stop printing the source line at any trailing whitespace, and start
+- printing it as per m_x_offset_display. */
++ /* We will stop printing the source line at any trailing whitespace. */
+ line_bytes = get_line_bytes_without_trailing_whitespace (line,
+ line_bytes);
+- int x_offset_bytes = 0;
+- if (m_x_offset_display)
+- {
+- x_offset_bytes = cpp_display_column_to_byte_column (line, line_bytes,
+- m_x_offset_display);
+- /* In case the leading portion of the line that will be skipped over ends
+- with a character with wcwidth > 1, then it is possible we skipped too
+- much, so account for that by padding with spaces. */
+- const int overage
+- = cpp_byte_column_to_display_column (line, line_bytes, x_offset_bytes)
+- - m_x_offset_display;
+- for (int column = 0; column < overage; ++column)
+- pp_space (m_pp);
+- line += x_offset_bytes;
+- }
+
+- /* Print the line. */
+- int first_non_ws = INT_MAX;
+- int last_non_ws = 0;
+- for (int col_byte = 1 + x_offset_bytes; col_byte <= line_bytes; col_byte++)
++ /* This object helps to keep track of which display column we are at, which is
++ necessary for computing the line bounds in display units, for doing
++ tab expansion, and for implementing m_x_offset_display. */
++ cpp_display_width_computation dw (line, line_bytes, m_context->tabstop);
++
++ /* Skip the first m_x_offset_display display columns. In case the leading
++ portion that will be skipped ends with a character with wcwidth > 1, then
++ it is possible we skipped too much, so account for that by padding with
++ spaces. Note that this does the right thing too in case a tab was the last
++ character to be skipped over; the tab is effectively replaced by the
++ correct number of trailing spaces needed to offset by the desired number of
++ display columns. */
++ for (int skipped_display_cols = dw.advance_display_cols (m_x_offset_display);
++ skipped_display_cols > m_x_offset_display; --skipped_display_cols)
++ pp_space (m_pp);
++
++ /* Print the line and compute the line_bounds. */
++ line_bounds lbounds;
++ while (!dw.done ())
+ {
+ /* Assuming colorization is enabled for the caret and underline
+ characters, we may also colorize the associated characters
+@@ -1510,7 +1512,8 @@ layout::print_source_line (linenum_type
+ {
+ bool in_range_p;
+ point_state state;
+- in_range_p = get_state_at_point (row, col_byte,
++ const int start_byte_col = dw.bytes_processed () + 1;
++ in_range_p = get_state_at_point (row, start_byte_col,
+ 0, INT_MAX,
+ CU_BYTES,
+ &state);
+@@ -1519,22 +1522,44 @@ layout::print_source_line (linenum_type
+ else
+ m_colorizer.set_normal_text ();
+ }
+- char c = *line;
+- if (c == '\0' || c == '\t' || c == '\r')
+- c = ' ';
+- if (c != ' ')
++
++ /* Get the display width of the next character to be output, expanding
++ tabs and replacing some control bytes with spaces as necessary. */
++ const char *c = dw.next_byte ();
++ const int start_disp_col = dw.display_cols_processed () + 1;
++ const int this_display_width = dw.process_next_codepoint ();
++ if (*c == '\t')
++ {
++ /* The returned display width is the number of spaces into which the
++ tab should be expanded. */
++ for (int i = 0; i != this_display_width; ++i)
++ pp_space (m_pp);
++ continue;
++ }
++ if (*c == '\0' || *c == '\r')
+ {
+- last_non_ws = col_byte;
+- if (first_non_ws == INT_MAX)
+- first_non_ws = col_byte;
++ /* cpp_wcwidth() promises to return 1 for all control bytes, and we
++ want to output these as a single space too, so this case is
++ actually the same as the '\t' case. */
++ gcc_assert (this_display_width == 1);
++ pp_space (m_pp);
++ continue;
+ }
+- pp_character (m_pp, c);
+- line++;
++
++ /* We have a (possibly multibyte) character to output; update the line
++ bounds if it is not whitespace. */
++ if (*c != ' ')
++ {
++ lbounds.m_last_non_ws_disp_col = dw.display_cols_processed ();
++ if (lbounds.m_first_non_ws_disp_col == INT_MAX)
++ lbounds.m_first_non_ws_disp_col = start_disp_col;
++ }
++
++ /* Output the character. */
++ while (c != dw.next_byte ()) pp_character (m_pp, *c++);
+ }
+ print_newline ();
+-
+- lbounds_out->m_first_non_ws = first_non_ws;
+- lbounds_out->m_last_non_ws = last_non_ws;
++ return lbounds;
+ }
+
+ /* Determine if we should print an annotation line for ROW.
+@@ -1576,14 +1601,13 @@ layout::start_annotation_line (char marg
+ }
+
+ /* Print a line consisting of the caret/underlines for the given
+- source line. This function works with display columns, rather than byte
+- counts; in particular, LBOUNDS should be in display column units. */
++ source line. */
+
+ void
+ layout::print_annotation_line (linenum_type row, const line_bounds lbounds)
+ {
+ int x_bound = get_x_bound_for_row (row, m_exploc.m_display_col,
+- lbounds.m_last_non_ws);
++ lbounds.m_last_non_ws_disp_col);
+
+ start_annotation_line ();
+ pp_space (m_pp);
+@@ -1593,8 +1617,8 @@ layout::print_annotation_line (linenum_t
+ bool in_range_p;
+ point_state state;
+ in_range_p = get_state_at_point (row, column,
+- lbounds.m_first_non_ws,
+- lbounds.m_last_non_ws,
++ lbounds.m_first_non_ws_disp_col,
++ lbounds.m_last_non_ws_disp_col,
+ CU_DISPLAY_COLS,
+ &state);
+ if (in_range_p)
+@@ -1631,12 +1655,14 @@ layout::print_annotation_line (linenum_t
+ class line_label
+ {
+ public:
+- line_label (int state_idx, int column, label_text text)
++ line_label (diagnostic_context *context, int state_idx, int column,
++ label_text text)
+ : m_state_idx (state_idx), m_column (column),
+ m_text (text), m_label_line (0), m_has_vbar (true)
+ {
+ const int bytes = strlen (text.m_buffer);
+- m_display_width = cpp_display_width (text.m_buffer, bytes);
++ m_display_width
++ = cpp_display_width (text.m_buffer, bytes, context->tabstop);
+ }
+
+ /* Sorting is primarily by column, then by state index. */
+@@ -1696,7 +1722,7 @@ layout::print_any_labels (linenum_type r
+ if (text.m_buffer == NULL)
+ continue;
+
+- labels.safe_push (line_label (i, disp_col, text));
++ labels.safe_push (line_label (m_context, i, disp_col, text));
+ }
+ }
+
+@@ -1976,7 +2002,8 @@ public:
+
+ /* Get the range of bytes or display columns that HINT would affect. */
+ static column_range
+-get_affected_range (const fixit_hint *hint, enum column_unit col_unit)
++get_affected_range (diagnostic_context *context,
++ const fixit_hint *hint, enum column_unit col_unit)
+ {
+ expanded_location exploc_start = expand_location (hint->get_start_loc ());
+ expanded_location exploc_finish = expand_location (hint->get_next_loc ());
+@@ -1986,11 +2013,13 @@ get_affected_range (const fixit_hint *hi
+ int finish_column;
+ if (col_unit == CU_DISPLAY_COLS)
+ {
+- start_column = location_compute_display_column (exploc_start);
++ start_column
++ = location_compute_display_column (exploc_start, context->tabstop);
+ if (hint->insertion_p ())
+ finish_column = start_column - 1;
+ else
+- finish_column = location_compute_display_column (exploc_finish);
++ finish_column
++ = location_compute_display_column (exploc_finish, context->tabstop);
+ }
+ else
+ {
+@@ -2003,12 +2032,12 @@ get_affected_range (const fixit_hint *hi
+ /* Get the range of display columns that would be printed for HINT. */
+
+ static column_range
+-get_printed_columns (const fixit_hint *hint)
++get_printed_columns (diagnostic_context *context, const fixit_hint *hint)
+ {
+ expanded_location exploc = expand_location (hint->get_start_loc ());
+- int start_column = location_compute_display_column (exploc);
+- int hint_width = cpp_display_width (hint->get_string (),
+- hint->get_length ());
++ int start_column = location_compute_display_column (exploc, context->tabstop);
++ int hint_width = cpp_display_width (hint->get_string (), hint->get_length (),
++ context->tabstop);
+ int final_hint_column = start_column + hint_width - 1;
+ if (hint->insertion_p ())
+ {
+@@ -2018,7 +2047,8 @@ get_printed_columns (const fixit_hint *h
+ {
+ exploc = expand_location (hint->get_next_loc ());
+ --exploc.column;
+- int finish_column = location_compute_display_column (exploc);
++ int finish_column
++ = location_compute_display_column (exploc, context->tabstop);
+ return column_range (start_column,
+ MAX (finish_column, final_hint_column));
+ }
+@@ -2035,12 +2065,14 @@ public:
+ correction (column_range affected_bytes,
+ column_range affected_columns,
+ column_range printed_columns,
+- const char *new_text, size_t new_text_len)
++ const char *new_text, size_t new_text_len,
++ int tabstop)
+ : m_affected_bytes (affected_bytes),
+ m_affected_columns (affected_columns),
+ m_printed_columns (printed_columns),
+ m_text (xstrdup (new_text)),
+ m_byte_length (new_text_len),
++ m_tabstop (tabstop),
+ m_alloc_sz (new_text_len + 1)
+ {
+ compute_display_cols ();
+@@ -2058,7 +2090,7 @@ public:
+
+ void compute_display_cols ()
+ {
+- m_display_cols = cpp_display_width (m_text, m_byte_length);
++ m_display_cols = cpp_display_width (m_text, m_byte_length, m_tabstop);
+ }
+
+ void overwrite (int dst_offset, const char_span &src_span)
+@@ -2086,6 +2118,7 @@ public:
+ char *m_text;
+ size_t m_byte_length; /* Not including null-terminator. */
+ int m_display_cols;
++ int m_tabstop;
+ size_t m_alloc_sz;
+ };
+
+@@ -2121,13 +2154,15 @@ correction::ensure_terminated ()
+ class line_corrections
+ {
+ public:
+- line_corrections (const char *filename, linenum_type row)
+- : m_filename (filename), m_row (row)
++ line_corrections (diagnostic_context *context, const char *filename,
++ linenum_type row)
++ : m_context (context), m_filename (filename), m_row (row)
+ {}
+ ~line_corrections ();
+
+ void add_hint (const fixit_hint *hint);
+
++ diagnostic_context *m_context;
+ const char *m_filename;
+ linenum_type m_row;
+ auto_vec <correction *> m_corrections;
+@@ -2173,9 +2208,10 @@ source_line::source_line (const char *fi
+ void
+ line_corrections::add_hint (const fixit_hint *hint)
+ {
+- column_range affected_bytes = get_affected_range (hint, CU_BYTES);
+- column_range affected_columns = get_affected_range (hint, CU_DISPLAY_COLS);
+- column_range printed_columns = get_printed_columns (hint);
++ column_range affected_bytes = get_affected_range (m_context, hint, CU_BYTES);
++ column_range affected_columns = get_affected_range (m_context, hint,
++ CU_DISPLAY_COLS);
++ column_range printed_columns = get_printed_columns (m_context, hint);
+
+ /* Potentially consolidate. */
+ if (!m_corrections.is_empty ())
+@@ -2243,7 +2279,8 @@ line_corrections::add_hint (const fixit_
+ affected_columns,
+ printed_columns,
+ hint->get_string (),
+- hint->get_length ()));
++ hint->get_length (),
++ m_context->tabstop));
+ }
+
+ /* If there are any fixit hints on source line ROW, print them.
+@@ -2257,7 +2294,7 @@ layout::print_trailing_fixits (linenum_t
+ {
+ /* Build a list of correction instances for the line,
+ potentially consolidating hints (for the sake of readability). */
+- line_corrections corrections (m_exploc.file, row);
++ line_corrections corrections (m_context, m_exploc.file, row);
+ for (unsigned int i = 0; i < m_fixit_hints.length (); i++)
+ {
+ const fixit_hint *hint = m_fixit_hints[i];
+@@ -2499,15 +2536,11 @@ layout::print_line (linenum_type row)
+ if (!line)
+ return;
+
+- line_bounds lbounds;
+ print_leading_fixits (row);
+- print_source_line (row, line.get_buffer (), line.length (), &lbounds);
++ const line_bounds lbounds
++ = print_source_line (row, line.get_buffer (), line.length ());
+ if (should_print_annotation_line_p (row))
+- {
+- if (lbounds.m_first_non_ws != INT_MAX)
+- lbounds.convert_to_display_cols (line);
+- print_annotation_line (row, lbounds);
+- }
++ print_annotation_line (row, lbounds);
+ if (m_show_labels_p)
+ print_any_labels (row);
+ print_trailing_fixits (row);
+@@ -2670,9 +2703,11 @@ test_layout_x_offset_display_utf8 (const
+
+ char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+ ASSERT_EQ (line_display_cols,
+- cpp_display_width (lspan.get_buffer (), lspan.length ()));
++ cpp_display_width (lspan.get_buffer (), lspan.length (),
++ def_tabstop));
+ ASSERT_EQ (line_display_cols,
+- location_compute_display_column (expand_location (line_end)));
++ location_compute_display_column (expand_location (line_end),
++ def_tabstop));
+ ASSERT_EQ (0, memcmp (lspan.get_buffer () + (emoji_col - 1),
+ "\xf0\x9f\x98\x82\xf0\x9f\x98\x82", 8));
+
+@@ -2774,6 +2809,111 @@ test_layout_x_offset_display_utf8 (const
+
+ }
+
++static void
++test_layout_x_offset_display_tab (const line_table_case &case_)
++{
++ const char *content
++ = "This line is very long, so that we can use it to test the logic for "
++ "clipping long lines. Also this: `\t' is a tab that occupies 1 byte and "
++ "a variable number of display columns, starting at column #103.\n";
++
++ /* Number of bytes in the line, subtracting one to remove the newline. */
++ const int line_bytes = strlen (content) - 1;
++
++ /* The column where the tab begins. Byte or display is the same as there are
++ no multibyte characters earlier on the line. */
++ const int tab_col = 103;
++
++ /* Effective extra size of the tab beyond what a single space would have taken
++ up, indexed by tabstop. */
++ static const int num_tabstops = 11;
++ int extra_width[num_tabstops];
++ for (int tabstop = 1; tabstop != num_tabstops; ++tabstop)
++ {
++ const int this_tab_size = tabstop - (tab_col - 1) % tabstop;
++ extra_width[tabstop] = this_tab_size - 1;
++ }
++ /* Example of this calculation: if tabstop is 10, the tab starting at column
++ #103 has to expand into 8 spaces, covering columns 103-110, so that the
++ next character is at column #111. So it takes up 7 more columns than
++ a space would have taken up. */
++ ASSERT_EQ (7, extra_width[10]);
++
++ temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
++ line_table_test ltt (case_);
++
++ linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
++
++ location_t line_end = linemap_position_for_column (line_table, line_bytes);
++
++ /* Don't attempt to run the tests if column data might be unavailable. */
++ if (line_end > LINE_MAP_MAX_LOCATION_WITH_COLS)
++ return;
++
++ /* Check that cpp_display_width handles the tabs as expected. */
++ char_span lspan = location_get_source_line (tmp.get_filename (), 1);
++ ASSERT_EQ ('\t', *(lspan.get_buffer () + (tab_col - 1)));
++ for (int tabstop = 1; tabstop != num_tabstops; ++tabstop)
++ {
++ ASSERT_EQ (line_bytes + extra_width[tabstop],
++ cpp_display_width (lspan.get_buffer (), lspan.length (),
++ tabstop));
++ ASSERT_EQ (line_bytes + extra_width[tabstop],
++ location_compute_display_column (expand_location (line_end),
++ tabstop));
++ }
++
++ /* Check that the tab is expanded to the expected number of spaces. */
++ rich_location richloc (line_table,
++ linemap_position_for_column (line_table,
++ tab_col + 1));
++ for (int tabstop = 1; tabstop != num_tabstops; ++tabstop)
++ {
++ test_diagnostic_context dc;
++ dc.tabstop = tabstop;
++ layout test_layout (&dc, &richloc, DK_ERROR);
++ test_layout.print_line (1);
++ const char *out = pp_formatted_text (dc.printer);
++ ASSERT_EQ (NULL, strchr (out, '\t'));
++ const char *left_quote = strchr (out, '`');
++ const char *right_quote = strchr (out, '\'');
++ ASSERT_NE (NULL, left_quote);
++ ASSERT_NE (NULL, right_quote);
++ ASSERT_EQ (right_quote - left_quote, extra_width[tabstop] + 2);
++ }
++
++ /* Check that the line is offset properly and that the tab is broken up
++ into the expected number of spaces when it is the last character skipped
++ over. */
++ for (int tabstop = 1; tabstop != num_tabstops; ++tabstop)
++ {
++ test_diagnostic_context dc;
++ dc.tabstop = tabstop;
++ static const int small_width = 24;
++ dc.caret_max_width = small_width - 4;
++ dc.min_margin_width = test_left_margin - test_linenum_sep + 1;
++ dc.show_line_numbers_p = true;
++ layout test_layout (&dc, &richloc, DK_ERROR);
++ test_layout.print_line (1);
++
++ /* We have arranged things so that two columns will be printed before
++ the caret. If the tab results in more than one space, this should
++ produce two spaces in the output; otherwise, it will be a single space
++ preceded by the opening quote before the tab character. */
++ const char *output1
++ = " 1 | ' is a tab that occupies 1 byte and a variable number of "
++ "display columns, starting at column #103.\n"
++ " | ^\n\n";
++ const char *output2
++ = " 1 | ` ' is a tab that occupies 1 byte and a variable number of "
++ "display columns, starting at column #103.\n"
++ " | ^\n\n";
++ const char *expected_output = (extra_width[tabstop] ? output1 : output2);
++ ASSERT_STREQ (expected_output, pp_formatted_text (dc.printer));
++ }
++}
++
++
+ /* Verify that diagnostic_show_locus works sanely on UNKNOWN_LOCATION. */
+
+ static void
+@@ -3854,6 +3994,27 @@ test_one_liner_labels_utf8 ()
+ }
+ }
+
++/* Make sure that colorization codes don't interrupt a multibyte
++ sequence, which would corrupt it. */
++static void
++test_one_liner_colorized_utf8 ()
++{
++ test_diagnostic_context dc;
++ dc.colorize_source_p = true;
++ diagnostic_color_init (&dc, DIAGNOSTICS_COLOR_YES);
++ const location_t pi = linemap_position_for_column (line_table, 12);
++ rich_location richloc (line_table, pi);
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++
++ /* In order to avoid having the test depend on exactly how the colorization
++ was effected, just confirm there are two pi characters in the output. */
++ const char *result = pp_formatted_text (dc.printer);
++ const char *null_term = result + strlen (result);
++ const char *first_pi = strstr (result, "\xcf\x80");
++ ASSERT_TRUE (first_pi && first_pi <= null_term - 2);
++ ASSERT_STR_CONTAINS (first_pi + 2, "\xcf\x80");
++}
++
+ /* Run the various one-liner tests. */
+
+ static void
+@@ -3884,8 +4045,10 @@ test_diagnostic_show_locus_one_liner_utf
+ ASSERT_EQ (31, LOCATION_COLUMN (line_end));
+
+ char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+- ASSERT_EQ (25, cpp_display_width (lspan.get_buffer (), lspan.length ()));
+- ASSERT_EQ (25, location_compute_display_column (expand_location (line_end)));
++ ASSERT_EQ (25, cpp_display_width (lspan.get_buffer (), lspan.length (),
++ def_tabstop));
++ ASSERT_EQ (25, location_compute_display_column (expand_location (line_end),
++ def_tabstop));
+
+ test_one_liner_simple_caret_utf8 ();
+ test_one_liner_caret_and_range_utf8 ();
+@@ -3900,6 +4063,7 @@ test_diagnostic_show_locus_one_liner_utf
+ test_one_liner_many_fixits_1_utf8 ();
+ test_one_liner_many_fixits_2_utf8 ();
+ test_one_liner_labels_utf8 ();
++ test_one_liner_colorized_utf8 ();
+ }
+
+ /* Verify that gcc_rich_location::add_location_if_nearby works. */
+@@ -4272,25 +4436,28 @@ test_overlapped_fixit_printing (const li
+ /* Unit-test the line_corrections machinery. */
+ ASSERT_EQ (3, richloc.get_num_fixit_hints ());
+ const fixit_hint *hint_0 = richloc.get_fixit_hint (0);
+- ASSERT_EQ (column_range (12, 12), get_affected_range (hint_0, CU_BYTES));
+ ASSERT_EQ (column_range (12, 12),
+- get_affected_range (hint_0, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (12, 22), get_printed_columns (hint_0));
++ get_affected_range (&dc, hint_0, CU_BYTES));
++ ASSERT_EQ (column_range (12, 12),
++ get_affected_range (&dc, hint_0, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (12, 22), get_printed_columns (&dc, hint_0));
+ const fixit_hint *hint_1 = richloc.get_fixit_hint (1);
+- ASSERT_EQ (column_range (18, 18), get_affected_range (hint_1, CU_BYTES));
+ ASSERT_EQ (column_range (18, 18),
+- get_affected_range (hint_1, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (18, 20), get_printed_columns (hint_1));
++ get_affected_range (&dc, hint_1, CU_BYTES));
++ ASSERT_EQ (column_range (18, 18),
++ get_affected_range (&dc, hint_1, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (18, 20), get_printed_columns (&dc, hint_1));
+ const fixit_hint *hint_2 = richloc.get_fixit_hint (2);
+- ASSERT_EQ (column_range (29, 28), get_affected_range (hint_2, CU_BYTES));
+ ASSERT_EQ (column_range (29, 28),
+- get_affected_range (hint_2, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (29, 29), get_printed_columns (hint_2));
++ get_affected_range (&dc, hint_2, CU_BYTES));
++ ASSERT_EQ (column_range (29, 28),
++ get_affected_range (&dc, hint_2, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (29, 29), get_printed_columns (&dc, hint_2));
+
+ /* Add each hint in turn to a line_corrections instance,
+ and verify that they are consolidated into one correction instance
+ as expected. */
+- line_corrections lc (tmp.get_filename (), 1);
++ line_corrections lc (&dc, tmp.get_filename (), 1);
+
+ /* The first replace hint by itself. */
+ lc.add_hint (hint_0);
+@@ -4484,25 +4651,28 @@ test_overlapped_fixit_printing_utf8 (con
+ /* Unit-test the line_corrections machinery. */
+ ASSERT_EQ (3, richloc.get_num_fixit_hints ());
+ const fixit_hint *hint_0 = richloc.get_fixit_hint (0);
+- ASSERT_EQ (column_range (14, 14), get_affected_range (hint_0, CU_BYTES));
++ ASSERT_EQ (column_range (14, 14),
++ get_affected_range (&dc, hint_0, CU_BYTES));
+ ASSERT_EQ (column_range (12, 12),
+- get_affected_range (hint_0, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (12, 22), get_printed_columns (hint_0));
++ get_affected_range (&dc, hint_0, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (12, 22), get_printed_columns (&dc, hint_0));
+ const fixit_hint *hint_1 = richloc.get_fixit_hint (1);
+- ASSERT_EQ (column_range (22, 22), get_affected_range (hint_1, CU_BYTES));
++ ASSERT_EQ (column_range (22, 22),
++ get_affected_range (&dc, hint_1, CU_BYTES));
+ ASSERT_EQ (column_range (18, 18),
+- get_affected_range (hint_1, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (18, 20), get_printed_columns (hint_1));
++ get_affected_range (&dc, hint_1, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (18, 20), get_printed_columns (&dc, hint_1));
+ const fixit_hint *hint_2 = richloc.get_fixit_hint (2);
+- ASSERT_EQ (column_range (35, 34), get_affected_range (hint_2, CU_BYTES));
++ ASSERT_EQ (column_range (35, 34),
++ get_affected_range (&dc, hint_2, CU_BYTES));
+ ASSERT_EQ (column_range (30, 29),
+- get_affected_range (hint_2, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (30, 30), get_printed_columns (hint_2));
++ get_affected_range (&dc, hint_2, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (30, 30), get_printed_columns (&dc, hint_2));
+
+ /* Add each hint in turn to a line_corrections instance,
+ and verify that they are consolidated into one correction instance
+ as expected. */
+- line_corrections lc (tmp.get_filename (), 1);
++ line_corrections lc (&dc, tmp.get_filename (), 1);
+
+ /* The first replace hint by itself. */
+ lc.add_hint (hint_0);
+@@ -4689,6 +4859,8 @@ test_overlapped_fixit_printing_2 (const
+
+ /* Two insertions, in the wrong order. */
+ {
++ test_diagnostic_context dc;
++
+ rich_location richloc (line_table, col_20);
+ richloc.add_fixit_insert_before (col_23, "{");
+ richloc.add_fixit_insert_before (col_21, "}");
+@@ -4696,14 +4868,15 @@ test_overlapped_fixit_printing_2 (const
+ /* These fixits should be accepted; they can't be consolidated. */
+ ASSERT_EQ (2, richloc.get_num_fixit_hints ());
+ const fixit_hint *hint_0 = richloc.get_fixit_hint (0);
+- ASSERT_EQ (column_range (23, 22), get_affected_range (hint_0, CU_BYTES));
+- ASSERT_EQ (column_range (23, 23), get_printed_columns (hint_0));
++ ASSERT_EQ (column_range (23, 22),
++ get_affected_range (&dc, hint_0, CU_BYTES));
++ ASSERT_EQ (column_range (23, 23), get_printed_columns (&dc, hint_0));
+ const fixit_hint *hint_1 = richloc.get_fixit_hint (1);
+- ASSERT_EQ (column_range (21, 20), get_affected_range (hint_1, CU_BYTES));
+- ASSERT_EQ (column_range (21, 21), get_printed_columns (hint_1));
++ ASSERT_EQ (column_range (21, 20),
++ get_affected_range (&dc, hint_1, CU_BYTES));
++ ASSERT_EQ (column_range (21, 21), get_printed_columns (&dc, hint_1));
+
+ /* Verify that they're printed correctly. */
+- test_diagnostic_context dc;
+ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
+ ASSERT_STREQ (" int a5[][0][0] = { 1, 2 };\n"
+ " ^\n"
+@@ -4955,6 +5128,65 @@ test_fixit_deletion_affecting_newline (c
+ pp_formatted_text (dc.printer));
+ }
+
++static void
++test_tab_expansion (const line_table_case &case_)
++{
++ /* Create a tempfile and write some text to it. This example uses a tabstop
++ of 8, as the column numbers attempt to indicate:
++
++ .....................000.01111111111.22222333333 display
++ .....................123.90123456789.56789012345 columns */
++ const char *content = " \t This: `\t' is a tab.\n";
++ /* ....................000 00000011111 11111222222 byte
++ ....................123 45678901234 56789012345 columns */
++
++ const int tabstop = 8;
++ const int first_non_ws_byte_col = 7;
++ const int right_quote_byte_col = 15;
++ const int last_byte_col = 25;
++ ASSERT_EQ (35, cpp_display_width (content, last_byte_col, tabstop));
++
++ temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
++ line_table_test ltt (case_);
++ linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 1);
++
++ /* Don't attempt to run the tests if column data might be unavailable. */
++ location_t line_end = linemap_position_for_column (line_table, last_byte_col);
++ if (line_end > LINE_MAP_MAX_LOCATION_WITH_COLS)
++ return;
++
++ /* Check that the leading whitespace with mixed tabs and spaces is expanded
++ into 11 spaces. Recall that print_line() also puts one space before
++ everything too. */
++ {
++ test_diagnostic_context dc;
++ dc.tabstop = tabstop;
++ rich_location richloc (line_table,
++ linemap_position_for_column (line_table,
++ first_non_ws_byte_col));
++ layout test_layout (&dc, &richloc, DK_ERROR);
++ test_layout.print_line (1);
++ ASSERT_STREQ (" This: ` ' is a tab.\n"
++ " ^\n",
++ pp_formatted_text (dc.printer));
++ }
++
++ /* Confirm the display width was tracked correctly across the internal tab
++ as well. */
++ {
++ test_diagnostic_context dc;
++ dc.tabstop = tabstop;
++ rich_location richloc (line_table,
++ linemap_position_for_column (line_table,
++ right_quote_byte_col));
++ layout test_layout (&dc, &richloc, DK_ERROR);
++ test_layout.print_line (1);
++ ASSERT_STREQ (" This: ` ' is a tab.\n"
++ " ^\n",
++ pp_formatted_text (dc.printer));
++ }
++}
++
+ /* Verify that line numbers are correctly printed for the case of
+ a multiline range in which the width of the line numbers changes
+ (e.g. from "9" to "10"). */
+@@ -5012,6 +5244,7 @@ diagnostic_show_locus_c_tests ()
+ test_layout_range_for_multiple_lines ();
+
+ for_each_line_table_case (test_layout_x_offset_display_utf8);
++ for_each_line_table_case (test_layout_x_offset_display_tab);
+
+ test_get_line_bytes_without_trailing_whitespace ();
+
+@@ -5029,6 +5262,7 @@ diagnostic_show_locus_c_tests ()
+ for_each_line_table_case (test_fixit_insert_containing_newline_2);
+ for_each_line_table_case (test_fixit_replace_containing_newline);
+ for_each_line_table_case (test_fixit_deletion_affecting_newline);
++ for_each_line_table_case (test_tab_expansion);
+
+ test_line_numbers_multiline_range ();
+ }
+diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
+--- a/gcc/doc/invoke.texi 2021-12-24 20:23:46.876739587 -0800
++++ b/gcc/doc/invoke.texi 2021-12-25 01:20:53.487636494 -0800
+@@ -293,7 +293,9 @@ Objective-C and Objective-C++ Dialects}.
+ -fdiagnostics-show-template-tree -fno-elide-type @gol
+ -fdiagnostics-path-format=@r{[}none@r{|}separate-events@r{|}inline-events@r{]} @gol
+ -fdiagnostics-show-path-depths @gol
+--fno-show-column}
++-fno-show-column @gol
++-fdiagnostics-column-unit=@r{[}display@r{|}byte@r{]} @gol
++-fdiagnostics-column-origin=@var{origin}}
+
+ @item Warning Options
+ @xref{Warning Options,,Options to Request or Suppress Warnings}.
+@@ -4424,6 +4426,31 @@ Do not print column numbers in diagnosti
+ diagnostics are being scanned by a program that does not understand the
+ column numbers, such as @command{dejagnu}.
+
++@item -fdiagnostics-column-unit=@var{UNIT}
++@opindex fdiagnostics-column-unit
++Select the units for the column number. This affects traditional diagnostics
++(in the absence of @option{-fno-show-column}), as well as JSON format
++diagnostics if requested.
++
++The default @var{UNIT}, @samp{display}, considers the number of display
++columns occupied by each character. This may be larger than the number
++of bytes required to encode the character, in the case of tab
++characters, or it may be smaller, in the case of multibyte characters.
++For example, the character ``GREEK SMALL LETTER PI (U+03C0)'' occupies one
++display column, and its UTF-8 encoding requires two bytes; the character
++``SLIGHTLY SMILING FACE (U+1F642)'' occupies two display columns, and
++its UTF-8 encoding requires four bytes.
++
++Setting @var{UNIT} to @samp{byte} changes the column number to the raw byte
++count in all cases, as was traditionally output by GCC prior to version 11.1.0.
++
++@item -fdiagnostics-column-origin=@var{ORIGIN}
++@opindex fdiagnostics-column-origin
++Select the origin for column numbers, i.e. the column number assigned to the
++first column. The default value of 1 corresponds to traditional GCC
++behavior and to the GNU style guide. Some utilities may perform better with an
++origin of 0; any non-negative value may be specified.
++
+ @item -fdiagnostics-format=@var{FORMAT}
+ @opindex fdiagnostics-format
+ Select a different format for printing diagnostics.
+@@ -4459,11 +4486,15 @@ might be printed in JSON form (after for
+ "locations": [
+ @{
+ "caret": @{
++ "display-column": 3,
++ "byte-column": 3,
+ "column": 3,
+ "file": "misleading-indentation.c",
+ "line": 15
+ @},
+ "finish": @{
++ "display-column": 4,
++ "byte-column": 4,
+ "column": 4,
+ "file": "misleading-indentation.c",
+ "line": 15
+@@ -4479,6 +4510,8 @@ might be printed in JSON form (after for
+ "locations": [
+ @{
+ "caret": @{
++ "display-column": 5,
++ "byte-column": 5,
+ "column": 5,
+ "file": "misleading-indentation.c",
+ "line": 17
+@@ -4488,6 +4521,7 @@ might be printed in JSON form (after for
+ "message": "...this statement, but the latter is @dots{}"
+ @}
+ ]
++ "column-origin": 1,
+ @},
+ @dots{}
+ ]
+@@ -4500,10 +4534,34 @@ A diagnostic has a @code{kind}. If this
+ an @code{option} key describing the command-line option controlling the
+ warning.
+
+-A diagnostic can contain zero or more locations. Each location has up
+-to three positions within it: a @code{caret} position and optional
+-@code{start} and @code{finish} positions. A location can also have
+-an optional @code{label} string. For example, this error:
++A diagnostic can contain zero or more locations. Each location has an
++optional @code{label} string and up to three positions within it: a
++@code{caret} position and optional @code{start} and @code{finish} positions.
++A position is described by a @code{file} name, a @code{line} number, and
++three numbers indicating a column position:
++@itemize @bullet
++
++@item
++@code{display-column} counts display columns, accounting for tabs and
++multibyte characters.
++
++@item
++@code{byte-column} counts raw bytes.
++
++@item
++@code{column} is equal to one of
++the previous two, as dictated by the @option{-fdiagnostics-column-unit}
++option.
++
++@end itemize
++All three columns are relative to the origin specified by
++@option{-fdiagnostics-column-origin}, which is typically equal to 1 but may
++be set, for instance, to 0 for compatibility with other utilities that
++number columns from 0. The column origin is recorded in the JSON output in
++the @code{column-origin} tag. In the remaining examples below, the extra
++column number outputs have been omitted for brevity.
++
++For example, this error:
+
+ @smallexample
+ bad-binary-ops.c:64:23: error: invalid operands to binary + (have 'S' @{aka
+diff --git a/gcc/input.c b/gcc/input.c
+--- a/gcc/input.c 2020-07-22 23:35:17.664388078 -0700
++++ b/gcc/input.c 2021-12-25 01:20:53.487636494 -0800
+@@ -913,7 +913,7 @@ make_location (location_t caret, source_
+ source line in order to calculate the display width. If that cannot be done
+ for any reason, then returns the byte column as a fallback. */
+ int
+-location_compute_display_column (expanded_location exploc)
++location_compute_display_column (expanded_location exploc, int tabstop)
+ {
+ if (!(exploc.file && *exploc.file && exploc.line && exploc.column))
+ return exploc.column;
+@@ -921,7 +921,7 @@ location_compute_display_column (expande
+ /* If line is NULL, this function returns exploc.column which is the
+ desired fallback. */
+ return cpp_byte_column_to_display_column (line.get_buffer (), line.length (),
+- exploc.column);
++ exploc.column, tabstop);
+ }
+
+ /* Dump statistics to stderr about the memory usage of the line_table
+@@ -3608,33 +3608,46 @@ test_line_offset_overflow ()
+
+ void test_cpp_utf8 ()
+ {
++ const int def_tabstop = 8;
+ /* Verify that wcwidth of invalid UTF-8 or control bytes is 1. */
+ {
+- int w_bad = cpp_display_width ("\xf0!\x9f!\x98!\x82!", 8);
++ int w_bad = cpp_display_width ("\xf0!\x9f!\x98!\x82!", 8, def_tabstop);
+ ASSERT_EQ (8, w_bad);
+- int w_ctrl = cpp_display_width ("\r\t\n\v\0\1", 6);
+- ASSERT_EQ (6, w_ctrl);
++ int w_ctrl = cpp_display_width ("\r\n\v\0\1", 5, def_tabstop);
++ ASSERT_EQ (5, w_ctrl);
+ }
+
+ /* Verify that wcwidth of valid UTF-8 is as expected. */
+ {
+- const int w_pi = cpp_display_width ("\xcf\x80", 2);
++ const int w_pi = cpp_display_width ("\xcf\x80", 2, def_tabstop);
+ ASSERT_EQ (1, w_pi);
+- const int w_emoji = cpp_display_width ("\xf0\x9f\x98\x82", 4);
++ const int w_emoji = cpp_display_width ("\xf0\x9f\x98\x82", 4, def_tabstop);
+ ASSERT_EQ (2, w_emoji);
+- const int w_umlaut_precomposed = cpp_display_width ("\xc3\xbf", 2);
++ const int w_umlaut_precomposed = cpp_display_width ("\xc3\xbf", 2,
++ def_tabstop);
+ ASSERT_EQ (1, w_umlaut_precomposed);
+- const int w_umlaut_combining = cpp_display_width ("y\xcc\x88", 3);
++ const int w_umlaut_combining = cpp_display_width ("y\xcc\x88", 3,
++ def_tabstop);
+ ASSERT_EQ (1, w_umlaut_combining);
+- const int w_han = cpp_display_width ("\xe4\xb8\xba", 3);
++ const int w_han = cpp_display_width ("\xe4\xb8\xba", 3, def_tabstop);
+ ASSERT_EQ (2, w_han);
+- const int w_ascii = cpp_display_width ("GCC", 3);
++ const int w_ascii = cpp_display_width ("GCC", 3, def_tabstop);
+ ASSERT_EQ (3, w_ascii);
+ const int w_mixed = cpp_display_width ("\xcf\x80 = 3.14 \xf0\x9f\x98\x82"
+- "\x9f! \xe4\xb8\xba y\xcc\x88", 24);
++ "\x9f! \xe4\xb8\xba y\xcc\x88",
++ 24, def_tabstop);
+ ASSERT_EQ (18, w_mixed);
+ }
+
++ /* Verify that display width properly expands tabs. */
++ {
++ const char *tstr = "\tabc\td";
++ ASSERT_EQ (6, cpp_display_width (tstr, 6, 1));
++ ASSERT_EQ (10, cpp_display_width (tstr, 6, 3));
++ ASSERT_EQ (17, cpp_display_width (tstr, 6, 8));
++ ASSERT_EQ (1, cpp_display_column_to_byte_column (tstr, 6, 7, 8));
++ }
++
+ /* Verify that cpp_byte_column_to_display_column can go past the end,
+ and similar edge cases. */
+ {
+@@ -3645,10 +3658,13 @@ void test_cpp_utf8 ()
+ /* 111122223456
+ Byte columns. */
+
+- ASSERT_EQ (5, cpp_display_width (str, 6));
+- ASSERT_EQ (105, cpp_byte_column_to_display_column (str, 6, 106));
+- ASSERT_EQ (10000, cpp_byte_column_to_display_column (NULL, 0, 10000));
+- ASSERT_EQ (0, cpp_byte_column_to_display_column (NULL, 10000, 0));
++ ASSERT_EQ (5, cpp_display_width (str, 6, def_tabstop));
++ ASSERT_EQ (105,
++ cpp_byte_column_to_display_column (str, 6, 106, def_tabstop));
++ ASSERT_EQ (10000,
++ cpp_byte_column_to_display_column (NULL, 0, 10000, def_tabstop));
++ ASSERT_EQ (0,
++ cpp_byte_column_to_display_column (NULL, 10000, 0, def_tabstop));
+ }
+
+ /* Verify that cpp_display_column_to_byte_column can go past the end,
+@@ -3662,21 +3678,25 @@ void test_cpp_utf8 ()
+ /* 000000000000000000000000000000000111111
+ 111122223333444456666777788889999012345
+ Byte columns. */
+- ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 2));
+- ASSERT_EQ (15, cpp_display_column_to_byte_column (str, 15, 11));
+- ASSERT_EQ (115, cpp_display_column_to_byte_column (str, 15, 111));
+- ASSERT_EQ (10000, cpp_display_column_to_byte_column (NULL, 0, 10000));
+- ASSERT_EQ (0, cpp_display_column_to_byte_column (NULL, 10000, 0));
++ ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 2, def_tabstop));
++ ASSERT_EQ (15,
++ cpp_display_column_to_byte_column (str, 15, 11, def_tabstop));
++ ASSERT_EQ (115,
++ cpp_display_column_to_byte_column (str, 15, 111, def_tabstop));
++ ASSERT_EQ (10000,
++ cpp_display_column_to_byte_column (NULL, 0, 10000, def_tabstop));
++ ASSERT_EQ (0,
++ cpp_display_column_to_byte_column (NULL, 10000, 0, def_tabstop));
+
+ /* Verify that we do not interrupt a UTF-8 sequence. */
+- ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 1));
++ ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 1, def_tabstop));
+
+ for (int byte_col = 1; byte_col <= 15; ++byte_col)
+ {
+- const int disp_col = cpp_byte_column_to_display_column (str, 15,
+- byte_col);
+- const int byte_col2 = cpp_display_column_to_byte_column (str, 15,
+- disp_col);
++ const int disp_col
++ = cpp_byte_column_to_display_column (str, 15, byte_col, def_tabstop);
++ const int byte_col2
++ = cpp_display_column_to_byte_column (str, 15, disp_col, def_tabstop);
+
+ /* If we ask for the display column in the middle of a UTF-8
+ sequence, it will return the length of the partial sequence,
+diff --git a/gcc/input.h b/gcc/input.h
+--- a/gcc/input.h 2020-07-22 23:35:17.664388078 -0700
++++ b/gcc/input.h 2021-12-25 01:20:53.487636494 -0800
+@@ -38,7 +38,9 @@ STATIC_ASSERT (BUILTINS_LOCATION < RESER
+
+ extern bool is_location_from_builtin_token (location_t);
+ extern expanded_location expand_location (location_t);
+-extern int location_compute_display_column (expanded_location);
++
++extern int location_compute_display_column (expanded_location exploc,
++ int tabstop);
+
+ /* A class capturing the bounds of a buffer, to allow for run-time
+ bounds-checking in a checked build. */
+diff --git a/gcc/opts.c b/gcc/opts.c
+--- a/gcc/opts.c 2020-07-22 23:35:17.708388562 -0700
++++ b/gcc/opts.c 2021-12-25 01:20:53.487636494 -0800
+@@ -2439,6 +2439,14 @@ common_handle_option (struct gcc_options
+ dc->parseable_fixits_p = value;
+ break;
+
++ case OPT_fdiagnostics_column_unit_:
++ dc->column_unit = (enum diagnostics_column_unit)value;
++ break;
++
++ case OPT_fdiagnostics_column_origin_:
++ dc->column_origin = value;
++ break;
++
+ case OPT_fdiagnostics_show_cwe:
+ dc->show_cwe = value;
+ break;
+@@ -2825,6 +2833,12 @@ common_handle_option (struct gcc_options
+ check_alignment_argument (loc, arg, "functions");
+ break;
+
++ case OPT_ftabstop_:
++ /* It is documented that we silently ignore silly values. */
++ if (value >= 1 && value <= 100)
++ dc->tabstop = value;
++ break;
++
+ default:
+ /* If the flag was handled in a standard way, assume the lack of
+ processing here is intentional. */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c 2020-07-22 23:35:17.908390765 -0700
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c 2021-12-25 01:20:53.487636494 -0800
+@@ -8,17 +8,22 @@
+ We can't rely on any ordering of the keys. */
+
+ /* { dg-regexp "\"kind\": \"error\"" } */
++/* { dg-regexp "\"column-origin\": 1" } */
+ /* { dg-regexp "\"message\": \"#error message\"" } */
+
+ /* { dg-regexp "\"caret\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-1.c\"" } */
+ /* { dg-regexp "\"line\": 4" } */
+ /* { dg-regexp "\"column\": 2" } */
++/* { dg-regexp "\"display-column\": 2" } */
++/* { dg-regexp "\"byte-column\": 2" } */
+
+ /* { dg-regexp "\"finish\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-1.c\"" } */
+ /* { dg-regexp "\"line\": 4" } */
+ /* { dg-regexp "\"column\": 6" } */
++/* { dg-regexp "\"display-column\": 6" } */
++/* { dg-regexp "\"byte-column\": 6" } */
+
+ /* { dg-regexp "\"locations\": \[\[\{\}, \]*\]" } */
+ /* { dg-regexp "\"children\": \[\[\]\[\]\]" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c 2020-07-22 23:35:17.908390765 -0700
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c 2021-12-25 01:20:53.487636494 -0800
+@@ -8,6 +8,7 @@
+ We can't rely on any ordering of the keys. */
+
+ /* { dg-regexp "\"kind\": \"warning\"" } */
++/* { dg-regexp "\"column-origin\": 1" } */
+ /* { dg-regexp "\"message\": \"#warning message\"" } */
+ /* { dg-regexp "\"option\": \"-Wcpp\"" } */
+ /* { dg-regexp "\"option_url\": \"https:\[^\n\r\"\]*#index-Wcpp\"" } */
+@@ -16,11 +17,15 @@
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-2.c\"" } */
+ /* { dg-regexp "\"line\": 4" } */
+ /* { dg-regexp "\"column\": 2" } */
++/* { dg-regexp "\"display-column\": 2" } */
++/* { dg-regexp "\"byte-column\": 2" } */
+
+ /* { dg-regexp "\"finish\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-2.c\"" } */
+ /* { dg-regexp "\"line\": 4" } */
+ /* { dg-regexp "\"column\": 8" } */
++/* { dg-regexp "\"display-column\": 8" } */
++/* { dg-regexp "\"byte-column\": 8" } */
+
+ /* { dg-regexp "\"locations\": \[\[\{\}, \]*\]" } */
+ /* { dg-regexp "\"children\": \[\[\]\[\]\]" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c 2020-07-22 23:35:17.908390765 -0700
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c 2021-12-25 01:20:53.487636494 -0800
+@@ -8,6 +8,7 @@
+ We can't rely on any ordering of the keys. */
+
+ /* { dg-regexp "\"kind\": \"error\"" } */
++/* { dg-regexp "\"column-origin\": 1" } */
+ /* { dg-regexp "\"message\": \"#warning message\"" } */
+ /* { dg-regexp "\"option\": \"-Werror=cpp\"" } */
+ /* { dg-regexp "\"option_url\": \"https:\[^\n\r\"\]*#index-Wcpp\"" } */
+@@ -16,11 +17,15 @@
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-3.c\"" } */
+ /* { dg-regexp "\"line\": 4" } */
+ /* { dg-regexp "\"column\": 2" } */
++/* { dg-regexp "\"display-column\": 2" } */
++/* { dg-regexp "\"byte-column\": 2" } */
+
+ /* { dg-regexp "\"finish\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-3.c\"" } */
+ /* { dg-regexp "\"line\": 4" } */
+ /* { dg-regexp "\"column\": 8" } */
++/* { dg-regexp "\"display-column\": 8" } */
++/* { dg-regexp "\"byte-column\": 8" } */
+
+ /* { dg-regexp "\"locations\": \[\[\{\}, \]*\]" } */
+ /* { dg-regexp "\"children\": \[\[\]\[\]\]" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c 2020-07-22 23:35:17.908390765 -0700
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c 2021-12-25 01:20:53.487636494 -0800
+@@ -24,15 +24,20 @@ int test (void)
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-4.c\"" } */
+ /* { dg-regexp "\"line\": 8" } */
+ /* { dg-regexp "\"column\": 5" } */
++/* { dg-regexp "\"display-column\": 5" } */
++/* { dg-regexp "\"byte-column\": 5" } */
+
+ /* { dg-regexp "\"finish\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-4.c\"" } */
+ /* { dg-regexp "\"line\": 8" } */
+ /* { dg-regexp "\"column\": 10" } */
++/* { dg-regexp "\"display-column\": 10" } */
++/* { dg-regexp "\"byte-column\": 10" } */
+
+ /* The outer diagnostic. */
+
+ /* { dg-regexp "\"kind\": \"warning\"" } */
++/* { dg-regexp "\"column-origin\": 1" } */
+ /* { dg-regexp "\"message\": \"this 'if' clause does not guard...\"" } */
+ /* { dg-regexp "\"option\": \"-Wmisleading-indentation\"" } */
+ /* { dg-regexp "\"option_url\": \"https:\[^\n\r\"\]*#index-Wmisleading-indentation\"" } */
+@@ -41,11 +46,15 @@ int test (void)
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-4.c\"" } */
+ /* { dg-regexp "\"line\": 6" } */
+ /* { dg-regexp "\"column\": 3" } */
++/* { dg-regexp "\"display-column\": 3" } */
++/* { dg-regexp "\"byte-column\": 3" } */
+
+ /* { dg-regexp "\"finish\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-4.c\"" } */
+ /* { dg-regexp "\"line\": 6" } */
+ /* { dg-regexp "\"column\": 4" } */
++/* { dg-regexp "\"display-column\": 4" } */
++/* { dg-regexp "\"byte-column\": 4" } */
+
+ /* More from the nested diagnostic (we can't guarantee what order the
+ "file" keys are consumed). */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c 2020-07-22 23:35:17.908390765 -0700
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c 2021-12-25 01:20:53.487636494 -0800
+@@ -13,6 +13,7 @@ int test (struct s *ptr)
+ We can't rely on any ordering of the keys. */
+
+ /* { dg-regexp "\"kind\": \"error\"" } */
++/* { dg-regexp "\"column-origin\": 1" } */
+ /* { dg-regexp "\"message\": \".*\"" } */
+
+ /* Verify fix-it hints. */
+@@ -23,11 +24,15 @@ int test (struct s *ptr)
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-5.c\"" } */
+ /* { dg-regexp "\"line\": 8" } */
+ /* { dg-regexp "\"column\": 15" } */
++/* { dg-regexp "\"display-column\": 15" } */
++/* { dg-regexp "\"byte-column\": 15" } */
+
+ /* { dg-regexp "\"next\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-5.c\"" } */
+ /* { dg-regexp "\"line\": 8" } */
+ /* { dg-regexp "\"column\": 21" } */
++/* { dg-regexp "\"display-column\": 21" } */
++/* { dg-regexp "\"byte-column\": 21" } */
+
+ /* { dg-regexp "\"fixits\": \[\[\{\}, \]*\]" } */
+
+@@ -35,11 +40,15 @@ int test (struct s *ptr)
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-5.c\"" } */
+ /* { dg-regexp "\"line\": 8" } */
+ /* { dg-regexp "\"column\": 15" } */
++/* { dg-regexp "\"display-column\": 15" } */
++/* { dg-regexp "\"byte-column\": 15" } */
+
+ /* { dg-regexp "\"finish\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-5.c\"" } */
+ /* { dg-regexp "\"line\": 8" } */
+ /* { dg-regexp "\"column\": 20" } */
++/* { dg-regexp "\"display-column\": 20" } */
++/* { dg-regexp "\"byte-column\": 20" } */
+
+ /* { dg-regexp "\"locations\": \[\[\{\}, \]*\]" } */
+ /* { dg-regexp "\"children\": \[\[\]\[\]\]" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-1.c b/gcc/testsuite/c-c++-common/diagnostic-units-1.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-1.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-1.c 2021-12-25 01:20:53.487636494 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=byte -fshow-column -fdiagnostics-show-caret -Wmultichar" } */
++
++/* column units: bytes (via arg)
++ column origin: 1 (via default)
++ tabstop: 8 (via default) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "11: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "18: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "19: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-2.c b/gcc/testsuite/c-c++-common/diagnostic-units-2.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-2.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-2.c 2021-12-25 01:20:53.487636494 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=display -fshow-column -fdiagnostics-show-caret -Wmultichar" } */
++
++/* column units: display (via arg)
++ column origin: 1 (via default)
++ tabstop: 8 (via default) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "18: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "18: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "25: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-3.c b/gcc/testsuite/c-c++-common/diagnostic-units-3.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-3.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-3.c 2021-12-25 01:20:53.487636494 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=byte -fshow-column -fdiagnostics-show-caret -ftabstop=200 -Wmultichar" } */
++
++/* column units: bytes (via arg)
++ column origin: 1 (via fallback from overly large argument)
++ tabstop: 8 (via default) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "11: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "18: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "19: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-4.c b/gcc/testsuite/c-c++-common/diagnostic-units-4.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-4.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-4.c 2021-12-25 01:20:53.487636494 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=byte -fshow-column -fdiagnostics-show-caret -fdiagnostics-column-origin=0 -Wmultichar" } */
++
++/* column units: bytes (via arg)
++ column origin: 0 (via arg)
++ tabstop: 8 (via default) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "10: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "17: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "18: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-5.c b/gcc/testsuite/c-c++-common/diagnostic-units-5.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-5.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-5.c 2021-12-25 01:20:53.491636427 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=display -fshow-column -fdiagnostics-show-caret -fdiagnostics-column-origin=0 -Wmultichar" } */
++
++/* column units: display (via arg)
++ column origin: 0 (via arg)
++ tabstop: 8 (via default) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "17: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "17: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "24: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-6.c b/gcc/testsuite/c-c++-common/diagnostic-units-6.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-6.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-6.c 2021-12-25 01:20:53.491636427 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=byte -fshow-column -fdiagnostics-show-caret -fdiagnostics-column-origin=100 -Wmultichar" } */
++
++/* column units: bytes (via arg)
++ column origin: 100 (via arg)
++ tabstop: 8 (via default) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "110: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "117: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "118: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-7.c b/gcc/testsuite/c-c++-common/diagnostic-units-7.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-7.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-7.c 2021-12-25 01:20:53.491636427 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fdiagnostics-column-unit=byte -fshow-column -fdiagnostics-show-caret -ftabstop=9 -Wmultichar" } */
++
++/* column units: bytes (via arg)
++ column origin: 1 (via default)
++ tabstop: 9 (via arg) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "11: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "19: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "20: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-units-8.c b/gcc/testsuite/c-c++-common/diagnostic-units-8.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-units-8.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-units-8.c 2021-12-25 01:20:53.491636427 -0800
+@@ -0,0 +1,28 @@
++/* { dg-do compile } */
++/* { dg-additional-options "-fshow-column -fdiagnostics-show-caret -ftabstop=9 -Wmultichar" } */
++
++/* column units: display (via default)
++ column origin: 1 (via default)
++ tabstop: 9 (via arg) */
++
++/* This line starts with a tab. */
++ int c1 = 'c1'; /* { dg-warning "19: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c1 = 'c1';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces. */
++ int c2 = 'c2'; /* { dg-warning "19: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c2 = 'c2';
++ ^~~~
++ { dg-end-multiline-output "" } */
++
++/* This line starts with <tabstop> spaces and has an internal tab after
++ a space. */
++ int c3 = 'c3'; /* { dg-warning "28: multi-character character constant" } */
++/* { dg-begin-multiline-output "" }
++ int c3 = 'c3';
++ ^~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/c-c++-common/missing-close-symbol.c b/gcc/testsuite/c-c++-common/missing-close-symbol.c
+--- a/gcc/testsuite/c-c++-common/missing-close-symbol.c 2020-07-22 23:35:17.912390810 -0700
++++ b/gcc/testsuite/c-c++-common/missing-close-symbol.c 2021-12-25 01:20:53.491636427 -0800
+@@ -24,9 +24,9 @@ void test_static_assert_different_line (
+ _Static_assert(sizeof(int) >= sizeof(char), /* { dg-message "to match this '\\('" } */
+ "msg"; /* { dg-error "expected '\\)' before ';' token" } */
+ /* { dg-begin-multiline-output "" }
+- "msg";
+- ^
+- )
++ "msg";
++ ^
++ )
+ { dg-end-multiline-output "" } */
+ /* { dg-begin-multiline-output "" }
+ _Static_assert(sizeof(int) >= sizeof(char),
+diff --git a/gcc/testsuite/c-c++-common/Wmisleading-indentation-3.c b/gcc/testsuite/c-c++-common/Wmisleading-indentation-3.c
+--- a/gcc/testsuite/c-c++-common/Wmisleading-indentation-3.c 2020-07-22 23:35:17.904390722 -0700
++++ b/gcc/testsuite/c-c++-common/Wmisleading-indentation-3.c 2021-12-25 01:20:53.487636494 -0800
+@@ -36,20 +36,20 @@ int fn_6 (int a, int b, int c)
+ /* ... */
+ if ((err = foo (a)) != 0)
+ goto fail;
+- if ((err = foo (b)) != 0) /* { dg-message "2: this 'if' clause does not guard..." } */
++ if ((err = foo (b)) != 0) /* { dg-message "9: this 'if' clause does not guard..." } */
+ goto fail;
+- goto fail; /* { dg-message "3: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'" } */
++ goto fail; /* { dg-message "17: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'" } */
+ if ((err = foo (c)) != 0)
+ goto fail;
+ /* ... */
+
+ /* { dg-begin-multiline-output "" }
+- if ((err = foo (b)) != 0)
+- ^~
++ if ((err = foo (b)) != 0)
++ ^~
+ { dg-end-multiline-output "" } */
+ /* { dg-begin-multiline-output "" }
+- goto fail;
+- ^~~~
++ goto fail;
++ ^~~~
+ { dg-end-multiline-output "" } */
+
+ fail:
+diff --git a/gcc/testsuite/c-c++-common/Wmisleading-indentation.c b/gcc/testsuite/c-c++-common/Wmisleading-indentation.c
+--- a/gcc/testsuite/c-c++-common/Wmisleading-indentation.c 2020-07-22 23:35:17.904390722 -0700
++++ b/gcc/testsuite/c-c++-common/Wmisleading-indentation.c 2021-12-25 01:20:53.487636494 -0800
+@@ -65,9 +65,9 @@ int fn_6 (int a, int b, int c)
+ /* ... */
+ if ((err = foo (a)) != 0)
+ goto fail;
+- if ((err = foo (b)) != 0) /* { dg-message "2: this 'if' clause does not guard..." } */
++ if ((err = foo (b)) != 0) /* { dg-message "9: this 'if' clause does not guard..." } */
+ goto fail;
+- goto fail; /* { dg-message "3: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'" } */
++ goto fail; /* { dg-message "17: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'" } */
+ if ((err = foo (c)) != 0)
+ goto fail;
+ /* ... */
+@@ -178,7 +178,7 @@ void fn_16_tabs (void)
+ while (flagA)
+ if (flagB) /* { dg-message "7: this 'if' clause does not guard..." } */
+ foo (0);
+- foo (1);/* { dg-message "2: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'" } */
++ foo (1);/* { dg-message "9: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'" } */
+ }
+
+ void fn_17_spaces (void)
+diff --git a/gcc/testsuite/gcc.dg/analyzer/malloc-paths-9.c b/gcc/testsuite/gcc.dg/analyzer/malloc-paths-9.c
+--- a/gcc/testsuite/gcc.dg/analyzer/malloc-paths-9.c 2020-07-22 23:35:18.124393144 -0700
++++ b/gcc/testsuite/gcc.dg/analyzer/malloc-paths-9.c 2021-12-25 01:20:53.491636427 -0800
+@@ -288,7 +288,7 @@ int test_3 (int x, int y)
+ | | ~~~~~~~~~~
+ | | |
+ | | (4) ...to here
+- | NN | to dereference it above
++ | NN | to dereference it above
+ | NN | return *ptr;
+ | | ~~~~
+ | | |
+diff --git a/gcc/testsuite/gcc.dg/bad-binary-ops.c b/gcc/testsuite/gcc.dg/bad-binary-ops.c
+--- a/gcc/testsuite/gcc.dg/bad-binary-ops.c 2020-07-22 23:35:18.128393190 -0700
++++ b/gcc/testsuite/gcc.dg/bad-binary-ops.c 2021-12-25 01:20:53.491636427 -0800
+@@ -35,10 +35,10 @@ int test_2 (void)
+ ~~~~~~~~~~~~~~~~
+ |
+ struct s
+- + some_other_function ());
+- ^ ~~~~~~~~~~~~~~~~~~~~~~
+- |
+- struct t
++ + some_other_function ());
++ ^ ~~~~~~~~~~~~~~~~~~~~~~
++ |
++ struct t
+ { dg-end-multiline-output "" } */
+ }
+
+diff --git a/gcc/testsuite/gcc.dg/format/branch-1.c b/gcc/testsuite/gcc.dg/format/branch-1.c
+--- a/gcc/testsuite/gcc.dg/format/branch-1.c 2020-07-22 23:35:18.152393454 -0700
++++ b/gcc/testsuite/gcc.dg/format/branch-1.c 2021-12-25 01:20:53.491636427 -0800
+@@ -10,7 +10,7 @@ foo (long l, int nfoo)
+ {
+ printf ((nfoo > 1) ? "%d foos" : "%d foo", nfoo);
+ printf ((l > 1) ? "%d foos" /* { dg-warning "23:int" "wrong type in conditional expr" } */
+- : "%d foo", l); /* { dg-warning "16:int" "wrong type in conditional expr" } */
++ : "%d foo", l); /* { dg-warning "23:int" "wrong type in conditional expr" } */
+ printf ((l > 1) ? "%ld foos" : "%d foo", l); /* { dg-warning "36:int" "wrong type in conditional expr" } */
+ printf ((l > 1) ? "%d foos" : "%ld foo", l); /* { dg-warning "23:int" "wrong type in conditional expr" } */
+ /* Should allow one case to have extra arguments. */
+diff --git a/gcc/testsuite/gcc.dg/format/pr79210.c b/gcc/testsuite/gcc.dg/format/pr79210.c
+--- a/gcc/testsuite/gcc.dg/format/pr79210.c 2020-07-22 23:35:18.152393454 -0700
++++ b/gcc/testsuite/gcc.dg/format/pr79210.c 2021-12-25 01:20:53.491636427 -0800
+@@ -20,4 +20,4 @@ LPFC_VPORT_ATTR_R(peer_port_login,
+ "Allow peer ports on the same physical port to login to each "
+ "other.");
+
+-/* { dg-warning "6: format .%d. expects argument of type .int., but argument 4 has type .unsigned int. " "" { target *-*-* } .-12 } */
++/* { dg-warning "20: format .%d. expects argument of type .int., but argument 4 has type .unsigned int. " "" { target *-*-* } .-12 } */
+diff --git a/gcc/testsuite/gcc.dg/plugin/diagnostic-test-expressions-1.c b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-expressions-1.c
+--- a/gcc/testsuite/gcc.dg/plugin/diagnostic-test-expressions-1.c 2020-07-22 23:35:18.172393674 -0700
++++ b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-expressions-1.c 2021-12-25 01:20:53.491636427 -0800
+@@ -540,15 +540,15 @@ void test_builtin_types_compatible_p (un
+ __emit_expression_range (0,
+ f (i) + __builtin_types_compatible_p (long, int)); /* { dg-warning "range" } */
+ /* { dg-begin-multiline-output "" }
+- f (i) + __builtin_types_compatible_p (long, int));
+- ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
++ f (i) + __builtin_types_compatible_p (long, int));
++ ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ { dg-end-multiline-output "" } */
+
+ __emit_expression_range (0,
+ __builtin_types_compatible_p (long, int) + f (i)); /* { dg-warning "range" } */
+ /* { dg-begin-multiline-output "" }
+- __builtin_types_compatible_p (long, int) + f (i));
+- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
++ __builtin_types_compatible_p (long, int) + f (i));
++ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
+ { dg-end-multiline-output "" } */
+ }
+
+@@ -671,8 +671,8 @@ void test_multiple_ordinary_maps (void)
+ /* { dg-begin-multiline-output "" }
+ __emit_expression_range (0, foo (0,
+ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+- "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"));
+- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
++ "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"));
++ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ { dg-end-multiline-output "" } */
+
+ /* Another expression that transitions between ordinary maps; this
+@@ -685,8 +685,8 @@ void test_multiple_ordinary_maps (void)
+ /* { dg-begin-multiline-output "" }
+ __emit_expression_range (0, foo (0, "01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789",
+ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+- 0));
+- ~~
++ 0));
++ ~~
+ { dg-end-multiline-output "" } */
+ }
+
+diff --git a/gcc/testsuite/gcc.dg/plugin/diagnostic-test-string-literals-1.c b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-string-literals-1.c
+--- a/gcc/testsuite/gcc.dg/plugin/diagnostic-test-string-literals-1.c 2020-07-22 23:35:18.172393674 -0700
++++ b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-string-literals-1.c 2021-12-25 01:20:53.491636427 -0800
+@@ -335,11 +335,11 @@ pr87652 (const char *stem, int counter)
+ /* { dg-error "unable to read substring location: unable to read source line" "" { target c } 329 } */
+ /* { dg-error "unable to read substring location: failed to get ordinary maps" "" { target c++ } 329 } */
+ /* { dg-begin-multiline-output "" }
+- __emit_string_literal_range(__FILE__":%5d: " format, \
++ __emit_string_literal_range(__FILE__":%5d: " format, \
+ ^~~~~~~~
+ { dg-end-multiline-output "" { target c } } */
+ /* { dg-begin-multiline-output "" }
+- __emit_string_literal_range(__FILE__":%5d: " format, \
++ __emit_string_literal_range(__FILE__":%5d: " format, \
+ ^
+ { dg-end-multiline-output "" { target c++ } } */
+
+diff --git a/gcc/testsuite/gcc.dg/redecl-4.c b/gcc/testsuite/gcc.dg/redecl-4.c
+--- a/gcc/testsuite/gcc.dg/redecl-4.c 2020-07-22 23:35:18.192393895 -0700
++++ b/gcc/testsuite/gcc.dg/redecl-4.c 2021-12-25 01:20:53.491636427 -0800
+@@ -15,7 +15,7 @@ f (void)
+ /* Should get format warnings even though the built-in declaration
+ isn't "visible". */
+ printf (
+- "%s", 1); /* { dg-warning "8:format" } */
++ "%s", 1); /* { dg-warning "15:format" } */
+ /* The type of strcmp here should have no prototype. */
+ if (0)
+ strcmp (1);
+diff --git a/gcc/testsuite/g++.dg/diagnostic/bad-binary-ops.C b/gcc/testsuite/g++.dg/diagnostic/bad-binary-ops.C
+--- a/gcc/testsuite/g++.dg/diagnostic/bad-binary-ops.C 2020-07-22 23:35:17.972391472 -0700
++++ b/gcc/testsuite/g++.dg/diagnostic/bad-binary-ops.C 2021-12-25 01:20:53.491636427 -0800
+@@ -33,10 +33,10 @@ int test_2 (void)
+ ~~~~~~~~~~~~~~~~
+ |
+ s
+- + some_other_function ());
+- ^ ~~~~~~~~~~~~~~~~~~~~~~
+- |
+- t
++ + some_other_function ());
++ ^ ~~~~~~~~~~~~~~~~~~~~~~
++ |
++ t
+ { dg-end-multiline-output "" } */
+ }
+
+diff --git a/gcc/testsuite/g++.dg/parse/error4.C b/gcc/testsuite/g++.dg/parse/error4.C
+--- a/gcc/testsuite/g++.dg/parse/error4.C 2020-07-22 23:35:18.012391910 -0700
++++ b/gcc/testsuite/g++.dg/parse/error4.C 2021-12-25 01:20:53.491636427 -0800
+@@ -7,4 +7,4 @@ struct X {
+ int);
+ };
+
+-// { dg-error "4:'itn' has not been declared" "" { target *-*-* } 6 }
++// { dg-error "18:'itn' has not been declared" "" { target *-*-* } 6 }
+diff --git a/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90 b/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90
+--- a/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90 2020-07-22 23:35:18.512397420 -0700
++++ b/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90 2021-12-25 01:20:53.491636427 -0800
+@@ -8,17 +8,22 @@
+ ! We can't rely on any ordering of the keys.
+
+ ! { dg-regexp "\"kind\": \"error\"" }
++! { dg-regexp "\"column-origin\": 1" }
+ ! { dg-regexp "\"message\": \"#error message\"" }
+
+ ! { dg-regexp "\"caret\": \{" }
+ ! { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-1.F90\"" }
+ ! { dg-regexp "\"line\": 4" }
+ ! { dg-regexp "\"column\": 2" }
++! { dg-regexp "\"display-column\": 2" }
++! { dg-regexp "\"byte-column\": 2" }
+
+ ! { dg-regexp "\"finish\": \{" }
+ ! { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-1.F90\"" }
+ ! { dg-regexp "\"line\": 4" }
+ ! { dg-regexp "\"column\": 6" }
++! { dg-regexp "\"display-column\": 6" }
++! { dg-regexp "\"byte-column\": 6" }
+
+ ! { dg-regexp "\"locations\": \[\[\{\}, \]*\]" }
+ ! { dg-regexp "\"children\": \[\[\]\[\]\]" }
+diff --git a/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90 b/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90
+--- a/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90 2020-07-22 23:35:18.512397420 -0700
++++ b/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90 2021-12-25 01:20:53.491636427 -0800
+@@ -8,6 +8,7 @@
+ ! We can't rely on any ordering of the keys.
+
+ ! { dg-regexp "\"kind\": \"warning\"" }
++! { dg-regexp "\"column-origin\": 1" }
+ ! { dg-regexp "\"message\": \"#warning message\"" }
+ ! { dg-regexp "\"option\": \"-Wcpp\"" }
+ ! { dg-regexp "\"option_url\": \"\[^\n\r\"\]*#index-Wcpp\"" }
+@@ -16,11 +17,15 @@
+ ! { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-2.F90\"" }
+ ! { dg-regexp "\"line\": 4" }
+ ! { dg-regexp "\"column\": 2" }
++! { dg-regexp "\"display-column\": 2" }
++! { dg-regexp "\"byte-column\": 2" }
+
+ ! { dg-regexp "\"finish\": \{" }
+ ! { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-2.F90\"" }
+ ! { dg-regexp "\"line\": 4" }
+ ! { dg-regexp "\"column\": 8" }
++! { dg-regexp "\"display-column\": 8" }
++! { dg-regexp "\"byte-column\": 8" }
+
+ ! { dg-regexp "\"locations\": \[\[\{\}, \]*\]" }
+ ! { dg-regexp "\"children\": \[\[\]\[\]\]" }
+diff --git a/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90 b/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90
+--- a/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90 2020-07-22 23:35:18.512397420 -0700
++++ b/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90 2021-12-25 01:20:53.491636427 -0800
+@@ -8,6 +8,7 @@
+ ! We can't rely on any ordering of the keys.
+
+ ! { dg-regexp "\"kind\": \"error\"" }
++! { dg-regexp "\"column-origin\": 1" }
+ ! { dg-regexp "\"message\": \"#warning message\"" }
+ ! { dg-regexp "\"option\": \"-Werror=cpp\"" }
+ ! { dg-regexp "\"option_url\": \"\[^\n\r\"\]*#index-Wcpp\"" }
+@@ -16,11 +17,15 @@
+ ! { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-3.F90\"" }
+ ! { dg-regexp "\"line\": 4" }
+ ! { dg-regexp "\"column\": 2" }
++! { dg-regexp "\"display-column\": 2" }
++! { dg-regexp "\"byte-column\": 2" }
+
+ ! { dg-regexp "\"finish\": \{" }
+ ! { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-3.F90\"" }
+ ! { dg-regexp "\"line\": 4" }
+ ! { dg-regexp "\"column\": 8" }
++! { dg-regexp "\"display-column\": 8" }
++! { dg-regexp "\"byte-column\": 8" }
+
+ ! { dg-regexp "\"locations\": \[\[\{\}, \]*\]" }
+ ! { dg-regexp "\"children\": \[\[\]\[\]\]" }
+diff --git a/gcc/testsuite/go.dg/arrayclear.go b/gcc/testsuite/go.dg/arrayclear.go
+--- a/gcc/testsuite/go.dg/arrayclear.go 2020-07-22 23:35:18.588398257 -0700
++++ b/gcc/testsuite/go.dg/arrayclear.go 2021-12-25 01:20:53.491636427 -0800
+@@ -1,5 +1,8 @@
+ // { dg-do compile }
+ // { dg-options "-fgo-debug-optimization" }
++// This comment is necessary to work around a dejagnu bug. Otherwise, the
++// column of the second error message would equal the row of the first one, and
++// since the errors are also identical, dejagnu is not able to distinguish them.
+
+ package p
+
+diff --git a/gcc/testsuite/g++.old-deja/g++.brendan/crash11.C b/gcc/testsuite/g++.old-deja/g++.brendan/crash11.C
+--- a/gcc/testsuite/g++.old-deja/g++.brendan/crash11.C 2020-07-22 23:35:18.048392308 -0700
++++ b/gcc/testsuite/g++.old-deja/g++.brendan/crash11.C 2021-12-25 01:20:53.491636427 -0800
+@@ -9,13 +9,13 @@ class A {
+ int h;
+ A() { i=10; j=20; }
+ virtual void f1() { printf("i=%d j=%d\n",i,j); }
+- friend virtual void f2() { printf("i=%d j=%d\n",i,j); } // { dg-error "9:virtual functions cannot be friends" }
++ friend virtual void f2() { printf("i=%d j=%d\n",i,j); } // { dg-error "16:virtual functions cannot be friends" }
+ };
+
+ class B : public A {
+ public:
+ virtual void f1() { printf("i=%d j=%d\n",i,j); }// { dg-error "" } member.*// ERROR - member.*
+- friend virtual void f2() { printf("i=%d j=%d\n",i,j); } // { dg-error "9:virtual functions cannot be friends" }
++ friend virtual void f2() { printf("i=%d j=%d\n",i,j); } // { dg-error "16:virtual functions cannot be friends" }
+ // { dg-error "private" "" { target *-*-* } .-1 }
+ };
+
+diff --git a/gcc/testsuite/g++.old-deja/g++.pt/overload2.C b/gcc/testsuite/g++.old-deja/g++.pt/overload2.C
+--- a/gcc/testsuite/g++.old-deja/g++.pt/overload2.C 2020-07-22 23:35:18.072392572 -0700
++++ b/gcc/testsuite/g++.old-deja/g++.pt/overload2.C 2021-12-25 01:20:53.491636427 -0800
+@@ -12,5 +12,5 @@ int
+ main()
+ {
+ C<char*> c;
+- char* p = Z(c.O); //{ dg-error "13:'Z' was not declared" } ambiguous c.O
++ char* p = Z(c.O); //{ dg-error "29:'Z' was not declared" } ambiguous c.O
+ }
+diff --git a/gcc/testsuite/g++.old-deja/g++.robertl/eb109.C b/gcc/testsuite/g++.old-deja/g++.robertl/eb109.C
+--- a/gcc/testsuite/g++.old-deja/g++.robertl/eb109.C 2020-07-22 23:35:18.076392617 -0700
++++ b/gcc/testsuite/g++.old-deja/g++.robertl/eb109.C 2021-12-25 01:20:53.491636427 -0800
+@@ -48,8 +48,8 @@ ostream& operator<<(ostream& os, Graph<V
+
+ // The compiler does not like this line!!!!!!
+ typename Graph<VertexType, EdgeType>::Successor::iterator
+- startN = G[i].second.begin(), // { dg-error "14:no match" } no index operator
+- endN = G[i].second.end(); // { dg-error "14:no match" } no index operator
++ startN = G[i].second.begin(), // { dg-error "21:no match" } no index operator
++ endN = G[i].second.end(); // { dg-error "21:no match" } no index operator
+
+ while(startN != endN)
+ {
+diff --git a/gcc/tree-diagnostic-path.cc b/gcc/tree-diagnostic-path.cc
+--- a/gcc/tree-diagnostic-path.cc 2020-07-22 23:35:18.628398698 -0700
++++ b/gcc/tree-diagnostic-path.cc 2021-12-25 01:20:53.491636427 -0800
+@@ -493,7 +493,7 @@ default_tree_diagnostic_path_printer (di
+ doesn't have access to trees (for m_fndecl). */
+
+ json::value *
+-default_tree_make_json_for_path (diagnostic_context *,
++default_tree_make_json_for_path (diagnostic_context *context,
+ const diagnostic_path *path)
+ {
+ json::array *path_array = new json::array ();
+@@ -504,7 +504,8 @@ default_tree_make_json_for_path (diagnos
+ json::object *event_obj = new json::object ();
+ if (event.get_location ())
+ event_obj->set ("location",
+- json_from_expanded_location (event.get_location ()));
++ json_from_expanded_location (context,
++ event.get_location ()));
+ label_text event_text (event.get_desc (false));
+ event_obj->set ("description", new json::string (event_text.m_buffer));
+ event_text.maybe_free ();
+diff --git a/libcpp/charset.c b/libcpp/charset.c
+--- a/libcpp/charset.c 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/charset.c 2021-12-25 01:20:53.491636427 -0800
+@@ -2276,49 +2276,90 @@ cpp_string_location_reader::get_next ()
+ return result;
+ }
+
+-/* Helper for cpp_byte_column_to_display_column and its inverse. Given a
+- pointer to a UTF-8-encoded character, compute its display width. *INBUFP
+- points on entry to the start of the UTF-8 encoding of the character, and
+- is updated to point just after the last byte of the encoding. *INBYTESLEFTP
+- contains on entry the remaining size of the buffer into which *INBUFP
+- points, and this is also updated accordingly. If *INBUFP does not
++cpp_display_width_computation::
++cpp_display_width_computation (const char *data, int data_length, int tabstop) :
++ m_begin (data),
++ m_next (m_begin),
++ m_bytes_left (data_length),
++ m_tabstop (tabstop),
++ m_display_cols (0)
++{
++ gcc_assert (m_tabstop > 0);
++}
++
++
++/* The main implementation function for class cpp_display_width_computation.
++ m_next points on entry to the start of the UTF-8 encoding of the next
++ character, and is updated to point just after the last byte of the encoding.
++ m_bytes_left contains on entry the remaining size of the buffer into which
++ m_next points, and this is also updated accordingly. If m_next does not
+ point to a valid UTF-8-encoded sequence, then it will be treated as a single
+- byte with display width 1. */
++ byte with display width 1. m_cur_display_col is the current display column,
++ relative to which tab stops should be expanded. Returns the display width of
++ the codepoint just processed. */
+
+-static inline int
+-compute_next_display_width (const uchar **inbufp, size_t *inbytesleftp)
++int
++cpp_display_width_computation::process_next_codepoint ()
+ {
+ cppchar_t c;
+- if (one_utf8_to_cppchar (inbufp, inbytesleftp, &c) != 0)
++ int next_width;
++
++ if (*m_next == '\t')
++ {
++ ++m_next;
++ --m_bytes_left;
++ next_width = m_tabstop - (m_display_cols % m_tabstop);
++ }
++ else if (one_utf8_to_cppchar ((const uchar **) &m_next, &m_bytes_left, &c)
++ != 0)
+ {
+ /* Input is not convertible to UTF-8. This could be fine, e.g. in a
+ string literal, so don't complain. Just treat it as if it has a width
+ of one. */
+- ++*inbufp;
+- --*inbytesleftp;
+- return 1;
++ ++m_next;
++ --m_bytes_left;
++ next_width = 1;
++ }
++ else
++ {
++ /* one_utf8_to_cppchar() has updated m_next and m_bytes_left for us. */
++ next_width = cpp_wcwidth (c);
+ }
+
+- /* one_utf8_to_cppchar() has updated inbufp and inbytesleftp for us. */
+- return cpp_wcwidth (c);
++ m_display_cols += next_width;
++ return next_width;
++}
++
++/* Utility to advance the byte stream by the minimum amount needed to consume
++ N display columns. Returns the number of display columns that were
++ actually skipped. This could be less than N, if there was not enough data,
++ or more than N, if the last character to be skipped had a sufficiently large
++ display width. */
++int
++cpp_display_width_computation::advance_display_cols (int n)
++{
++ const int start = m_display_cols;
++ const int target = start + n;
++ while (m_display_cols < target && !done ())
++ process_next_codepoint ();
++ return m_display_cols - start;
+ }
+
+ /* For the string of length DATA_LENGTH bytes that begins at DATA, compute
+ how many display columns are occupied by the first COLUMN bytes. COLUMN
+ may exceed DATA_LENGTH, in which case the phantom bytes at the end are
+- treated as if they have display width 1. */
++ treated as if they have display width 1. Tabs are expanded to the next tab
++ stop, relative to the start of DATA. */
+
+ int
+ cpp_byte_column_to_display_column (const char *data, int data_length,
+- int column)
++ int column, int tabstop)
+ {
+- int display_col = 0;
+- const uchar *udata = (const uchar *) data;
+ const int offset = MAX (0, column - data_length);
+- size_t inbytesleft = column - offset;
+- while (inbytesleft)
+- display_col += compute_next_display_width (&udata, &inbytesleft);
+- return display_col + offset;
++ cpp_display_width_computation dw (data, column - offset, tabstop);
++ while (!dw.done ())
++ dw.process_next_codepoint ();
++ return dw.display_cols_processed () + offset;
+ }
+
+ /* For the string of length DATA_LENGTH bytes that begins at DATA, compute
+@@ -2328,14 +2369,11 @@ cpp_byte_column_to_display_column (const
+
+ int
+ cpp_display_column_to_byte_column (const char *data, int data_length,
+- int display_col)
++ int display_col, int tabstop)
+ {
+- int column = 0;
+- const uchar *udata = (const uchar *) data;
+- size_t inbytesleft = data_length;
+- while (column < display_col && inbytesleft)
+- column += compute_next_display_width (&udata, &inbytesleft);
+- return data_length - inbytesleft + MAX (0, display_col - column);
++ cpp_display_width_computation dw (data, data_length, tabstop);
++ const int avail_display = dw.advance_display_cols (display_col);
++ return dw.bytes_processed () + MAX (0, display_col - avail_display);
+ }
+
+ /* Our own version of wcwidth(). We don't use the actual wcwidth() in glibc,
+diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
+--- a/libcpp/include/cpplib.h 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/include/cpplib.h 2021-12-25 01:20:53.491636427 -0800
+@@ -312,9 +312,6 @@ enum cpp_normalize_level {
+ carries all the options visible to the command line. */
+ struct cpp_options
+ {
+- /* Characters between tab stops. */
+- unsigned int tabstop;
+-
+ /* The language we're preprocessing. */
+ enum c_lang lang;
+
+@@ -1322,14 +1319,43 @@ extern const char * cpp_get_userdef_suff
+ (const cpp_token *);
+
+ /* In charset.c */
++
++/* A class to manage the state while converting a UTF-8 sequence to cppchar_t
++ and computing the display width one character at a time. */
++class cpp_display_width_computation {
++ public:
++ cpp_display_width_computation (const char *data, int data_length,
++ int tabstop);
++ const char *next_byte () const { return m_next; }
++ int bytes_processed () const { return m_next - m_begin; }
++ int bytes_left () const { return m_bytes_left; }
++ bool done () const { return !bytes_left (); }
++ int display_cols_processed () const { return m_display_cols; }
++
++ int process_next_codepoint ();
++ int advance_display_cols (int n);
++
++ private:
++ const char *const m_begin;
++ const char *m_next;
++ size_t m_bytes_left;
++ const int m_tabstop;
++ int m_display_cols;
++};
++
++/* Convenience functions that are simple use cases for class
++ cpp_display_width_computation. Tab characters will be expanded to spaces
++ as determined by TABSTOP. */
+ int cpp_byte_column_to_display_column (const char *data, int data_length,
+- int column);
+-inline int cpp_display_width (const char *data, int data_length)
++ int column, int tabstop);
++inline int cpp_display_width (const char *data, int data_length,
++ int tabstop)
+ {
+- return cpp_byte_column_to_display_column (data, data_length, data_length);
++ return cpp_byte_column_to_display_column (data, data_length, data_length,
++ tabstop);
+ }
+ int cpp_display_column_to_byte_column (const char *data, int data_length,
+- int display_col);
++ int display_col, int tabstop);
+ int cpp_wcwidth (cppchar_t c);
+
+ #endif /* ! LIBCPP_CPPLIB_H */
+diff --git a/libcpp/init.c b/libcpp/init.c
+--- a/libcpp/init.c 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/init.c 2021-12-25 01:20:53.491636427 -0800
+@@ -190,7 +190,6 @@ cpp_create_reader (enum c_lang lang, cpp
+ CPP_OPTION (pfile, discard_comments) = 1;
+ CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
+ CPP_OPTION (pfile, max_include_depth) = 200;
+- CPP_OPTION (pfile, tabstop) = 8;
+ CPP_OPTION (pfile, operator_names) = 1;
+ CPP_OPTION (pfile, warn_trigraphs) = 2;
+ CPP_OPTION (pfile, warn_endif_labels) = 1;
diff --git a/meta/recipes-devtools/gcc/gcc/0002-CVE-2021-42574.patch b/meta/recipes-devtools/gcc/gcc/0002-CVE-2021-42574.patch
new file mode 100644
index 0000000000..5b1896ed69
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0002-CVE-2021-42574.patch
@@ -0,0 +1,2270 @@
+From bd5e882cf6e0def3dd1bc106075d59a303fe0d1e Mon Sep 17 00:00:00 2001
+From: David Malcolm <dmalcolm@redhat.com>
+Date: Mon, 18 Oct 2021 18:55:31 -0400
+Subject: [PATCH] diagnostics: escape non-ASCII source bytes for certain
+ diagnostics
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf8
+Content-Transfer-Encoding: 8bit
+
+This patch adds support to GCC's diagnostic subsystem for escaping certain
+bytes and Unicode characters when quoting source code.
+
+Specifically, this patch adds a new flag rich_location::m_escape_on_output
+which is a hint from a diagnostic that non-ASCII bytes in the pertinent
+lines of the user's source code should be escaped when printed.
+
+The patch sets this for the following diagnostics:
+- when complaining about stray bytes in the program (when these
+are non-printable)
+- when complaining about "null character(s) ignored");
+- for -Wnormalized= (and generate source ranges for such warnings)
+
+The escaping is controlled by a new option:
+ -fdiagnostics-escape-format=[unicode|bytes]
+
+For example, consider a diagnostic involing a source line containing the
+string "before" followed by the Unicode character U+03C0 ("GREEK SMALL
+LETTER PI", with UTF-8 encoding 0xCF 0x80) followed by the byte 0xBF
+(a stray UTF-8 trailing byte), followed by the string "after", where the
+diagnostic highlights the U+03C0 character.
+
+By default, this line will be printed verbatim to the user when
+reporting a diagnostic at it, as:
+
+ beforeÏXafter
+ ^
+
+(using X for the stray byte to avoid putting invalid UTF-8 in this
+commit message)
+
+If the diagnostic sets the "escape" flag, it will be printed as:
+
+ before<U+03C0><BF>after
+ ^~~~~~~~
+
+with -fdiagnostics-escape-format=unicode (the default), or as:
+
+ before<CF><80><BF>after
+ ^~~~~~~~
+
+if the user supplies -fdiagnostics-escape-format=bytes.
+
+This only affects how the source is printed; it does not affect
+how column numbers that are printed (as per -fdiagnostics-column-unit=
+and -fdiagnostics-column-origin=).
+
+gcc/c-family/ChangeLog:
+ * c-lex.c (c_lex_with_flags): When complaining about non-printable
+ CPP_OTHER tokens, set the "escape on output" flag.
+
+gcc/ChangeLog:
+ * common.opt (fdiagnostics-escape-format=): New.
+ (diagnostics_escape_format): New enum.
+ (DIAGNOSTICS_ESCAPE_FORMAT_UNICODE): New enum value.
+ (DIAGNOSTICS_ESCAPE_FORMAT_BYTES): Likewise.
+ * diagnostic-format-json.cc (json_end_diagnostic): Add
+ "escape-source" attribute.
+ * diagnostic-show-locus.c
+ (exploc_with_display_col::exploc_with_display_col): Replace
+ "tabstop" param with a cpp_char_column_policy and add an "aspect"
+ param. Use these to compute m_display_col accordingly.
+ (struct char_display_policy): New struct.
+ (layout::m_policy): New field.
+ (layout::m_escape_on_output): New field.
+ (def_policy): New function.
+ (make_range): Update for changes to exploc_with_display_col ctor.
+ (default_print_decoded_ch): New.
+ (width_per_escaped_byte): New.
+ (escape_as_bytes_width): New.
+ (escape_as_bytes_print): New.
+ (escape_as_unicode_width): New.
+ (escape_as_unicode_print): New.
+ (make_policy): New.
+ (layout::layout): Initialize new fields. Update m_exploc ctor
+ call for above change to ctor.
+ (layout::maybe_add_location_range): Update for changes to
+ exploc_with_display_col ctor.
+ (layout::calculate_x_offset_display): Update for change to
+ cpp_display_width.
+ (layout::print_source_line): Pass policy
+ to cpp_display_width_computation. Capture cpp_decoded_char when
+ calling process_next_codepoint. Move printing of source code to
+ m_policy.m_print_cb.
+ (line_label::line_label): Pass in policy rather than context.
+ (layout::print_any_labels): Update for change to line_label ctor.
+ (get_affected_range): Pass in policy rather than context, updating
+ calls to location_compute_display_column accordingly.
+ (get_printed_columns): Likewise, also for cpp_display_width.
+ (correction::correction): Pass in policy rather than tabstop.
+ (correction::compute_display_cols): Pass m_policy rather than
+ m_tabstop to cpp_display_width.
+ (correction::m_tabstop): Replace with...
+ (correction::m_policy): ...this.
+ (line_corrections::line_corrections): Pass in policy rather than
+ context.
+ (line_corrections::m_context): Replace with...
+ (line_corrections::m_policy): ...this.
+ (line_corrections::add_hint): Update to use m_policy rather than
+ m_context.
+ (line_corrections::add_hint): Likewise.
+ (layout::print_trailing_fixits): Likewise.
+ (selftest::test_display_widths): New.
+ (selftest::test_layout_x_offset_display_utf8): Update to use
+ policy rather than tabstop.
+ (selftest::test_one_liner_labels_utf8): Add test of escaping
+ source lines.
+ (selftest::test_diagnostic_show_locus_one_liner_utf8): Update to
+ use policy rather than tabstop.
+ (selftest::test_overlapped_fixit_printing): Likewise.
+ (selftest::test_overlapped_fixit_printing_utf8): Likewise.
+ (selftest::test_overlapped_fixit_printing_2): Likewise.
+ (selftest::test_tab_expansion): Likewise.
+ (selftest::test_escaping_bytes_1): New.
+ (selftest::test_escaping_bytes_2): New.
+ (selftest::diagnostic_show_locus_c_tests): Call the new tests.
+ * diagnostic.c (diagnostic_initialize): Initialize
+ context->escape_format.
+ (convert_column_unit): Update to use default character width policy.
+ (selftest::test_diagnostic_get_location_text): Likewise.
+ * diagnostic.h (enum diagnostics_escape_format): New enum.
+ (diagnostic_context::escape_format): New field.
+ * doc/invoke.texi (-fdiagnostics-escape-format=): New option.
+ (-fdiagnostics-format=): Add "escape-source" attribute to examples
+ of JSON output, and document it.
+ * input.c (location_compute_display_column): Pass in "policy"
+ rather than "tabstop", passing to
+ cpp_byte_column_to_display_column.
+ (selftest::test_cpp_utf8): Update to use cpp_char_column_policy.
+ * input.h (class cpp_char_column_policy): New forward decl.
+ (location_compute_display_column): Pass in "policy" rather than
+ "tabstop".
+ * opts.c (common_handle_option): Handle
+ OPT_fdiagnostics_escape_format_.
+ * selftest.c (temp_source_file::temp_source_file): New ctor
+ overload taking a size_t.
+ * selftest.h (temp_source_file::temp_source_file): Likewise.
+
+gcc/testsuite/ChangeLog:
+ * c-c++-common/diagnostic-format-json-1.c: Add regexp to consume
+ "escape-source" attribute.
+ * c-c++-common/diagnostic-format-json-2.c: Likewise.
+ * c-c++-common/diagnostic-format-json-3.c: Likewise.
+ * c-c++-common/diagnostic-format-json-4.c: Likewise, twice.
+ * c-c++-common/diagnostic-format-json-5.c: Likewise.
+ * gcc.dg/cpp/warn-normalized-4-bytes.c: New test.
+ * gcc.dg/cpp/warn-normalized-4-unicode.c: New test.
+ * gcc.dg/encoding-issues-bytes.c: New test.
+ * gcc.dg/encoding-issues-unicode.c: New test.
+ * gfortran.dg/diagnostic-format-json-1.F90: Add regexp to consume
+ "escape-source" attribute.
+ * gfortran.dg/diagnostic-format-json-2.F90: Likewise.
+ * gfortran.dg/diagnostic-format-json-3.F90: Likewise.
+
+libcpp/ChangeLog:
+ * charset.c (convert_escape): Use encoding_rich_location when
+ complaining about nonprintable unknown escape sequences.
+ (cpp_display_width_computation::::cpp_display_width_computation):
+ Pass in policy rather than tabstop.
+ (cpp_display_width_computation::process_next_codepoint): Add "out"
+ param and populate *out if non-NULL.
+ (cpp_display_width_computation::advance_display_cols): Pass NULL
+ to process_next_codepoint.
+ (cpp_byte_column_to_display_column): Pass in policy rather than
+ tabstop. Pass NULL to process_next_codepoint.
+ (cpp_display_column_to_byte_column): Pass in policy rather than
+ tabstop.
+ * errors.c (cpp_diagnostic_get_current_location): New function,
+ splitting out the logic from...
+ (cpp_diagnostic): ...here.
+ (cpp_warning_at): New function.
+ (cpp_pedwarning_at): New function.
+ * include/cpplib.h (cpp_warning_at): New decl for rich_location.
+ (cpp_pedwarning_at): Likewise.
+ (struct cpp_decoded_char): New.
+ (struct cpp_char_column_policy): New.
+ (cpp_display_width_computation::cpp_display_width_computation):
+ Replace "tabstop" param with "policy".
+ (cpp_display_width_computation::process_next_codepoint): Add "out"
+ param.
+ (cpp_display_width_computation::m_tabstop): Replace with...
+ (cpp_display_width_computation::m_policy): ...this.
+ (cpp_byte_column_to_display_column): Replace "tabstop" param with
+ "policy".
+ (cpp_display_width): Likewise.
+ (cpp_display_column_to_byte_column): Likewise.
+ * include/line-map.h (rich_location::escape_on_output_p): New.
+ (rich_location::set_escape_on_output): New.
+ (rich_location::m_escape_on_output): New.
+ * internal.h (cpp_diagnostic_get_current_location): New decl.
+ (class encoding_rich_location): New.
+ * lex.c (skip_whitespace): Use encoding_rich_location when
+ complaining about null characters.
+ (warn_about_normalization): Generate a source range when
+ complaining about improperly normalized tokens, rather than just a
+ point, and use encoding_rich_location so that the source code
+ is escaped on printing.
+ * line-map.c (rich_location::rich_location): Initialize
+ m_escape_on_output.
+
+Signed-off-by: David Malcolm <dmalcolm@redhat.com>
+
+CVE: CVE-2021-42574
+Upstream-Status: Backport [https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=bd5e882cf6e0def3dd1bc106075d59a303fe0d1e]
+Signed-off-by: Pgowda <pgowda.cve@gmail.com>
+
+---
+ gcc/c-family/c-lex.c | 6 +-
+ gcc/common.opt | 13 +
+ gcc/diagnostic-format-json.cc | 3 +
+ gcc/diagnostic-show-locus.c | 580 +++++++++++++++---
+ gcc/diagnostic.c | 10 +-
+ gcc/diagnostic.h | 18 +
+ gcc/doc/invoke.texi | 43 +-
+ gcc/input.c | 62 +-
+ gcc/input.h | 7 +-
+ gcc/opts.c | 4 +
+ gcc/selftest.c | 15 +
+ gcc/selftest.h | 2 +
+ .../c-c++-common/diagnostic-format-json-1.c | 1 +
+ .../c-c++-common/diagnostic-format-json-2.c | 1 +
+ .../c-c++-common/diagnostic-format-json-3.c | 1 +
+ .../c-c++-common/diagnostic-format-json-4.c | 2 +
+ .../c-c++-common/diagnostic-format-json-5.c | 1 +
+ .../gcc.dg/cpp/warn-normalized-4-bytes.c | 21 +
+ .../gcc.dg/cpp/warn-normalized-4-unicode.c | 19 +
+ gcc/testsuite/gcc.dg/encoding-issues-bytes.c | Bin 0 -> 595 bytes
+ .../gcc.dg/encoding-issues-unicode.c | Bin 0 -> 613 bytes
+ .../gfortran.dg/diagnostic-format-json-1.F90 | 1 +
+ .../gfortran.dg/diagnostic-format-json-2.F90 | 1 +
+ .../gfortran.dg/diagnostic-format-json-3.F90 | 1 +
+ libcpp/charset.c | 63 +-
+ libcpp/errors.c | 82 ++-
+ libcpp/include/cpplib.h | 76 ++-
+ libcpp/include/line-map.h | 13 +
+ libcpp/internal.h | 23 +
+ libcpp/lex.c | 38 +-
+ libcpp/line-map.c | 3 +-
+ 31 files changed, 942 insertions(+), 168 deletions(-)
+ create mode 100644 gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c
+ create mode 100644 gcc/testsuite/gcc.dg/cpp/warn-normalized-4-unicode.c
+ create mode 100644 gcc/testsuite/gcc.dg/encoding-issues-bytes.c
+ create mode 100644 gcc/testsuite/gcc.dg/encoding-issues-unicode.c
+
+diff --git a/gcc/c-family/c-lex.c b/gcc/c-family/c-lex.c
+--- a/gcc/c-family/c-lex.c 2020-07-22 23:35:17.296384022 -0700
++++ b/gcc/c-family/c-lex.c 2021-12-25 01:30:50.669689023 -0800
+@@ -587,7 +587,11 @@ c_lex_with_flags (tree *value, location_
+ else if (ISGRAPH (c))
+ error_at (*loc, "stray %qc in program", (int) c);
+ else
+- error_at (*loc, "stray %<\\%o%> in program", (int) c);
++ {
++ rich_location rich_loc (line_table, *loc);
++ rich_loc.set_escape_on_output (true);
++ error_at (&rich_loc, "stray %<\\%o%> in program", (int) c);
++ }
+ }
+ goto retry;
+
+diff --git a/gcc/common.opt b/gcc/common.opt
+--- a/gcc/common.opt 2021-12-25 01:29:12.915317374 -0800
++++ b/gcc/common.opt 2021-12-25 01:30:50.669689023 -0800
+@@ -1337,6 +1337,10 @@ fdiagnostics-format=
+ Common Joined RejectNegative Enum(diagnostics_output_format)
+ -fdiagnostics-format=[text|json] Select output format.
+
++fdiagnostics-escape-format=
++Common Joined RejectNegative Enum(diagnostics_escape_format)
++-fdiagnostics-escape-format=[unicode|bytes] Select how to escape non-printable-ASCII bytes in the source for diagnostics that suggest it.
++
+ ; Required for these enum values.
+ SourceInclude
+ diagnostic.h
+@@ -1351,6 +1355,15 @@ EnumValue
+ Enum(diagnostics_column_unit) String(byte) Value(DIAGNOSTICS_COLUMN_UNIT_BYTE)
+
+ Enum
++Name(diagnostics_escape_format) Type(int)
++
++EnumValue
++Enum(diagnostics_escape_format) String(unicode) Value(DIAGNOSTICS_ESCAPE_FORMAT_UNICODE)
++
++EnumValue
++Enum(diagnostics_escape_format) String(bytes) Value(DIAGNOSTICS_ESCAPE_FORMAT_BYTES)
++
++Enum
+ Name(diagnostics_output_format) Type(int)
+
+ EnumValue
+diff --git a/gcc/diagnostic.c b/gcc/diagnostic.c
+--- a/gcc/diagnostic.c 2021-12-25 01:29:12.915317374 -0800
++++ b/gcc/diagnostic.c 2021-12-25 01:30:50.669689023 -0800
+@@ -223,6 +223,7 @@ diagnostic_initialize (diagnostic_contex
+ context->column_unit = DIAGNOSTICS_COLUMN_UNIT_DISPLAY;
+ context->column_origin = 1;
+ context->tabstop = 8;
++ context->escape_format = DIAGNOSTICS_ESCAPE_FORMAT_UNICODE;
+ context->edit_context_ptr = NULL;
+ context->diagnostic_group_nesting_depth = 0;
+ context->diagnostic_group_emission_count = 0;
+@@ -2152,8 +2153,8 @@ test_diagnostic_get_location_text ()
+ const char *const content = "smile \xf0\x9f\x98\x82\n";
+ const int line_bytes = strlen (content) - 1;
+ const int def_tabstop = 8;
+- const int display_width = cpp_display_width (content, line_bytes,
+- def_tabstop);
++ const cpp_char_column_policy policy (def_tabstop, cpp_wcwidth);
++ const int display_width = cpp_display_width (content, line_bytes, policy);
+ ASSERT_EQ (line_bytes - 2, display_width);
+ temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
+ const char *const fname = tmp.get_filename ();
+diff --git a/gcc/diagnostic-format-json.cc b/gcc/diagnostic-format-json.cc
+--- a/gcc/diagnostic-format-json.cc 2021-12-25 01:29:12.915317374 -0800
++++ b/gcc/diagnostic-format-json.cc 2021-12-25 01:30:50.669689023 -0800
+@@ -264,6 +264,9 @@ json_end_diagnostic (diagnostic_context
+ json::value *path_value = context->make_json_for_path (context, path);
+ diag_obj->set ("path", path_value);
+ }
++
++ diag_obj->set ("escape-source",
++ new json::literal (richloc->escape_on_output_p ()));
+ }
+
+ /* No-op implementation of "begin_group_cb" for JSON output. */
+diff --git a/gcc/diagnostic.h b/gcc/diagnostic.h
+--- a/gcc/diagnostic.h 2021-12-25 01:29:12.919317307 -0800
++++ b/gcc/diagnostic.h 2021-12-25 01:30:50.669689023 -0800
+@@ -38,6 +38,20 @@ enum diagnostics_column_unit
+ DIAGNOSTICS_COLUMN_UNIT_BYTE
+ };
+
++/* An enum for controlling how to print non-ASCII characters/bytes when
++ a diagnostic suggests escaping the source code on output. */
++
++enum diagnostics_escape_format
++{
++ /* Escape non-ASCII Unicode characters in the form <U+XXXX> and
++ non-UTF-8 bytes in the form <XX>. */
++ DIAGNOSTICS_ESCAPE_FORMAT_UNICODE,
++
++ /* Escape non-ASCII bytes in the form <XX> (thus showing the underlying
++ encoding of non-ASCII Unicode characters). */
++ DIAGNOSTICS_ESCAPE_FORMAT_BYTES
++};
++
+ /* Enum for overriding the standard output format. */
+
+ enum diagnostics_output_format
+@@ -303,6 +317,10 @@ struct diagnostic_context
+ /* The size of the tabstop for tab expansion. */
+ int tabstop;
+
++ /* How should non-ASCII/non-printable bytes be escaped when
++ a diagnostic suggests escaping the source code on output. */
++ enum diagnostics_escape_format escape_format;
++
+ /* If non-NULL, an edit_context to which fix-it hints should be
+ applied, for generating patches. */
+ edit_context *edit_context_ptr;
+diff --git a/gcc/diagnostic-show-locus.c b/gcc/diagnostic-show-locus.c
+--- a/gcc/diagnostic-show-locus.c 2021-12-25 01:29:12.919317307 -0800
++++ b/gcc/diagnostic-show-locus.c 2021-12-25 01:30:50.673688956 -0800
+@@ -175,10 +175,26 @@ enum column_unit {
+ class exploc_with_display_col : public expanded_location
+ {
+ public:
+- exploc_with_display_col (const expanded_location &exploc, int tabstop)
+- : expanded_location (exploc),
+- m_display_col (location_compute_display_column (exploc, tabstop))
+- {}
++ exploc_with_display_col (const expanded_location &exploc,
++ const cpp_char_column_policy &policy,
++ enum location_aspect aspect)
++ : expanded_location (exploc),
++ m_display_col (location_compute_display_column (exploc, policy))
++ {
++ if (exploc.column > 0)
++ {
++ /* m_display_col is now the final column of the byte.
++ If escaping has happened, we may want the first column instead. */
++ if (aspect != LOCATION_ASPECT_FINISH)
++ {
++ expanded_location prev_exploc (exploc);
++ prev_exploc.column--;
++ int prev_display_col
++ = (location_compute_display_column (prev_exploc, policy));
++ m_display_col = prev_display_col + 1;
++ }
++ }
++ }
+
+ int m_display_col;
+ };
+@@ -313,6 +329,31 @@ test_line_span ()
+
+ #endif /* #if CHECKING_P */
+
++/* A bundle of information containing how to print unicode
++ characters and bytes when quoting source code.
++
++ Provides a unified place to support escaping some subset
++ of characters to some format.
++
++ Extends char_column_policy; printing is split out to avoid
++ libcpp having to know about pretty_printer. */
++
++struct char_display_policy : public cpp_char_column_policy
++{
++ public:
++ char_display_policy (int tabstop,
++ int (*width_cb) (cppchar_t c),
++ void (*print_cb) (pretty_printer *pp,
++ const cpp_decoded_char &cp))
++ : cpp_char_column_policy (tabstop, width_cb),
++ m_print_cb (print_cb)
++ {
++ }
++
++ void (*m_print_cb) (pretty_printer *pp,
++ const cpp_decoded_char &cp);
++};
++
+ /* A class to control the overall layout when printing a diagnostic.
+
+ The layout is determined within the constructor.
+@@ -345,6 +386,8 @@ class layout
+
+ void print_line (linenum_type row);
+
++ void on_bad_codepoint (const char *ptr, cppchar_t ch, size_t ch_sz);
++
+ private:
+ bool will_show_line_p (linenum_type row) const;
+ void print_leading_fixits (linenum_type row);
+@@ -386,6 +429,7 @@ class layout
+ private:
+ diagnostic_context *m_context;
+ pretty_printer *m_pp;
++ char_display_policy m_policy;
+ location_t m_primary_loc;
+ exploc_with_display_col m_exploc;
+ colorizer m_colorizer;
+@@ -398,6 +442,7 @@ class layout
+ auto_vec <line_span> m_line_spans;
+ int m_linenum_width;
+ int m_x_offset_display;
++ bool m_escape_on_output;
+ };
+
+ /* Implementation of "class colorizer". */
+@@ -646,6 +691,11 @@ layout_range::intersects_line_p (linenum
+ /* Default for when we don't care what the tab expansion is set to. */
+ static const int def_tabstop = 8;
+
++static cpp_char_column_policy def_policy ()
++{
++ return cpp_char_column_policy (8, cpp_wcwidth);
++}
++
+ /* Create some expanded locations for testing layout_range. The filename
+ member of the explocs is set to the empty string. This member will only be
+ inspected by the calls to location_compute_display_column() made from the
+@@ -662,10 +712,13 @@ make_range (int start_line, int start_co
+ = {"", start_line, start_col, NULL, false};
+ const expanded_location finish_exploc
+ = {"", end_line, end_col, NULL, false};
+- return layout_range (exploc_with_display_col (start_exploc, def_tabstop),
+- exploc_with_display_col (finish_exploc, def_tabstop),
++ return layout_range (exploc_with_display_col (start_exploc, def_policy (),
++ LOCATION_ASPECT_START),
++ exploc_with_display_col (finish_exploc, def_policy (),
++ LOCATION_ASPECT_FINISH),
+ SHOW_RANGE_WITHOUT_CARET,
+- exploc_with_display_col (start_exploc, def_tabstop),
++ exploc_with_display_col (start_exploc, def_policy (),
++ LOCATION_ASPECT_CARET),
+ 0, NULL);
+ }
+
+@@ -950,6 +1003,164 @@ fixit_cmp (const void *p_a, const void *
+ return hint_a->get_start_loc () - hint_b->get_start_loc ();
+ }
+
++/* Callbacks for use when not escaping the source. */
++
++/* The default callback for char_column_policy::m_width_cb is cpp_wcwidth. */
++
++/* Callback for char_display_policy::m_print_cb for printing source chars
++ when not escaping the source. */
++
++static void
++default_print_decoded_ch (pretty_printer *pp,
++ const cpp_decoded_char &decoded_ch)
++{
++ for (const char *ptr = decoded_ch.m_start_byte;
++ ptr != decoded_ch.m_next_byte; ptr++)
++ {
++ if (*ptr == '\0' || *ptr == '\r')
++ {
++ pp_space (pp);
++ continue;
++ }
++
++ pp_character (pp, *ptr);
++ }
++}
++
++/* Callbacks for use with DIAGNOSTICS_ESCAPE_FORMAT_BYTES. */
++
++static const int width_per_escaped_byte = 4;
++
++/* Callback for char_column_policy::m_width_cb for determining the
++ display width when escaping with DIAGNOSTICS_ESCAPE_FORMAT_BYTES. */
++
++static int
++escape_as_bytes_width (cppchar_t ch)
++{
++ if (ch < 0x80 && ISPRINT (ch))
++ return cpp_wcwidth (ch);
++ else
++ {
++ if (ch <= 0x7F) return 1 * width_per_escaped_byte;
++ if (ch <= 0x7FF) return 2 * width_per_escaped_byte;
++ if (ch <= 0xFFFF) return 3 * width_per_escaped_byte;
++ return 4 * width_per_escaped_byte;
++ }
++}
++
++/* Callback for char_display_policy::m_print_cb for printing source chars
++ when escaping with DIAGNOSTICS_ESCAPE_FORMAT_BYTES. */
++
++static void
++escape_as_bytes_print (pretty_printer *pp,
++ const cpp_decoded_char &decoded_ch)
++{
++ if (!decoded_ch.m_valid_ch)
++ {
++ for (const char *iter = decoded_ch.m_start_byte;
++ iter != decoded_ch.m_next_byte; ++iter)
++ {
++ char buf[16];
++ sprintf (buf, "<%02x>", (unsigned char)*iter);
++ pp_string (pp, buf);
++ }
++ return;
++ }
++
++ cppchar_t ch = decoded_ch.m_ch;
++ if (ch < 0x80 && ISPRINT (ch))
++ pp_character (pp, ch);
++ else
++ {
++ for (const char *iter = decoded_ch.m_start_byte;
++ iter < decoded_ch.m_next_byte; ++iter)
++ {
++ char buf[16];
++ sprintf (buf, "<%02x>", (unsigned char)*iter);
++ pp_string (pp, buf);
++ }
++ }
++}
++
++/* Callbacks for use with DIAGNOSTICS_ESCAPE_FORMAT_UNICODE. */
++
++/* Callback for char_column_policy::m_width_cb for determining the
++ display width when escaping with DIAGNOSTICS_ESCAPE_FORMAT_UNICODE. */
++
++static int
++escape_as_unicode_width (cppchar_t ch)
++{
++ if (ch < 0x80 && ISPRINT (ch))
++ return cpp_wcwidth (ch);
++ else
++ {
++ // Width of "<U+%04x>"
++ if (ch > 0xfffff)
++ return 10;
++ else if (ch > 0xffff)
++ return 9;
++ else
++ return 8;
++ }
++}
++
++/* Callback for char_display_policy::m_print_cb for printing source chars
++ when escaping with DIAGNOSTICS_ESCAPE_FORMAT_UNICODE. */
++
++static void
++escape_as_unicode_print (pretty_printer *pp,
++ const cpp_decoded_char &decoded_ch)
++{
++ if (!decoded_ch.m_valid_ch)
++ {
++ escape_as_bytes_print (pp, decoded_ch);
++ return;
++ }
++
++ cppchar_t ch = decoded_ch.m_ch;
++ if (ch < 0x80 && ISPRINT (ch))
++ pp_character (pp, ch);
++ else
++ {
++ char buf[16];
++ sprintf (buf, "<U+%04X>", ch);
++ pp_string (pp, buf);
++ }
++}
++
++/* Populate a char_display_policy based on DC and RICHLOC. */
++
++static char_display_policy
++make_policy (const diagnostic_context &dc,
++ const rich_location &richloc)
++{
++ /* The default is to not escape non-ASCII bytes. */
++ char_display_policy result
++ (dc.tabstop, cpp_wcwidth, default_print_decoded_ch);
++
++ /* If the diagnostic suggests escaping non-ASCII bytes, then
++ use policy from user-supplied options. */
++ if (richloc.escape_on_output_p ())
++ {
++ result.m_undecoded_byte_width = width_per_escaped_byte;
++ switch (dc.escape_format)
++ {
++ default:
++ gcc_unreachable ();
++ case DIAGNOSTICS_ESCAPE_FORMAT_UNICODE:
++ result.m_width_cb = escape_as_unicode_width;
++ result.m_print_cb = escape_as_unicode_print;
++ break;
++ case DIAGNOSTICS_ESCAPE_FORMAT_BYTES:
++ result.m_width_cb = escape_as_bytes_width;
++ result.m_print_cb = escape_as_bytes_print;
++ break;
++ }
++ }
++
++ return result;
++}
++
+ /* Implementation of class layout. */
+
+ /* Constructor for class layout.
+@@ -966,8 +1177,10 @@ layout::layout (diagnostic_context * con
+ diagnostic_t diagnostic_kind)
+ : m_context (context),
+ m_pp (context->printer),
++ m_policy (make_policy (*context, *richloc)),
+ m_primary_loc (richloc->get_range (0)->m_loc),
+- m_exploc (richloc->get_expanded_location (0), context->tabstop),
++ m_exploc (richloc->get_expanded_location (0), m_policy,
++ LOCATION_ASPECT_CARET),
+ m_colorizer (context, diagnostic_kind),
+ m_colorize_source_p (context->colorize_source_p),
+ m_show_labels_p (context->show_labels_p),
+@@ -977,7 +1190,8 @@ layout::layout (diagnostic_context * con
+ m_fixit_hints (richloc->get_num_fixit_hints ()),
+ m_line_spans (1 + richloc->get_num_locations ()),
+ m_linenum_width (0),
+- m_x_offset_display (0)
++ m_x_offset_display (0),
++ m_escape_on_output (richloc->escape_on_output_p ())
+ {
+ for (unsigned int idx = 0; idx < richloc->get_num_locations (); idx++)
+ {
+@@ -1063,10 +1277,13 @@ layout::maybe_add_location_range (const
+
+ /* Everything is now known to be in the correct source file,
+ but it may require further sanitization. */
+- layout_range ri (exploc_with_display_col (start, m_context->tabstop),
+- exploc_with_display_col (finish, m_context->tabstop),
++ layout_range ri (exploc_with_display_col (start, m_policy,
++ LOCATION_ASPECT_START),
++ exploc_with_display_col (finish, m_policy,
++ LOCATION_ASPECT_FINISH),
+ loc_range->m_range_display_kind,
+- exploc_with_display_col (caret, m_context->tabstop),
++ exploc_with_display_col (caret, m_policy,
++ LOCATION_ASPECT_CARET),
+ original_idx, loc_range->m_label);
+
+ /* If we have a range that finishes before it starts (perhaps
+@@ -1400,7 +1617,7 @@ layout::calculate_x_offset_display ()
+ = get_line_bytes_without_trailing_whitespace (line.get_buffer (),
+ line.length ());
+ int eol_display_column
+- = cpp_display_width (line.get_buffer (), line_bytes, m_context->tabstop);
++ = cpp_display_width (line.get_buffer (), line_bytes, m_policy);
+ if (caret_display_column > eol_display_column
+ || !caret_display_column)
+ {
+@@ -1479,7 +1696,7 @@ layout::print_source_line (linenum_type
+ /* This object helps to keep track of which display column we are at, which is
+ necessary for computing the line bounds in display units, for doing
+ tab expansion, and for implementing m_x_offset_display. */
+- cpp_display_width_computation dw (line, line_bytes, m_context->tabstop);
++ cpp_display_width_computation dw (line, line_bytes, m_policy);
+
+ /* Skip the first m_x_offset_display display columns. In case the leading
+ portion that will be skipped ends with a character with wcwidth > 1, then
+@@ -1527,7 +1744,8 @@ layout::print_source_line (linenum_type
+ tabs and replacing some control bytes with spaces as necessary. */
+ const char *c = dw.next_byte ();
+ const int start_disp_col = dw.display_cols_processed () + 1;
+- const int this_display_width = dw.process_next_codepoint ();
++ cpp_decoded_char cp;
++ const int this_display_width = dw.process_next_codepoint (&cp);
+ if (*c == '\t')
+ {
+ /* The returned display width is the number of spaces into which the
+@@ -1536,15 +1754,6 @@ layout::print_source_line (linenum_type
+ pp_space (m_pp);
+ continue;
+ }
+- if (*c == '\0' || *c == '\r')
+- {
+- /* cpp_wcwidth() promises to return 1 for all control bytes, and we
+- want to output these as a single space too, so this case is
+- actually the same as the '\t' case. */
+- gcc_assert (this_display_width == 1);
+- pp_space (m_pp);
+- continue;
+- }
+
+ /* We have a (possibly multibyte) character to output; update the line
+ bounds if it is not whitespace. */
+@@ -1556,7 +1765,8 @@ layout::print_source_line (linenum_type
+ }
+
+ /* Output the character. */
+- while (c != dw.next_byte ()) pp_character (m_pp, *c++);
++ m_policy.m_print_cb (m_pp, cp);
++ c = dw.next_byte ();
+ }
+ print_newline ();
+ return lbounds;
+@@ -1655,14 +1865,14 @@ layout::print_annotation_line (linenum_t
+ class line_label
+ {
+ public:
+- line_label (diagnostic_context *context, int state_idx, int column,
++ line_label (const cpp_char_column_policy &policy,
++ int state_idx, int column,
+ label_text text)
+ : m_state_idx (state_idx), m_column (column),
+ m_text (text), m_label_line (0), m_has_vbar (true)
+ {
+ const int bytes = strlen (text.m_buffer);
+- m_display_width
+- = cpp_display_width (text.m_buffer, bytes, context->tabstop);
++ m_display_width = cpp_display_width (text.m_buffer, bytes, policy);
+ }
+
+ /* Sorting is primarily by column, then by state index. */
+@@ -1722,7 +1932,7 @@ layout::print_any_labels (linenum_type r
+ if (text.m_buffer == NULL)
+ continue;
+
+- labels.safe_push (line_label (m_context, i, disp_col, text));
++ labels.safe_push (line_label (m_policy, i, disp_col, text));
+ }
+ }
+
+@@ -2002,7 +2212,7 @@ public:
+
+ /* Get the range of bytes or display columns that HINT would affect. */
+ static column_range
+-get_affected_range (diagnostic_context *context,
++get_affected_range (const cpp_char_column_policy &policy,
+ const fixit_hint *hint, enum column_unit col_unit)
+ {
+ expanded_location exploc_start = expand_location (hint->get_start_loc ());
+@@ -2013,13 +2223,11 @@ get_affected_range (diagnostic_context *
+ int finish_column;
+ if (col_unit == CU_DISPLAY_COLS)
+ {
+- start_column
+- = location_compute_display_column (exploc_start, context->tabstop);
++ start_column = location_compute_display_column (exploc_start, policy);
+ if (hint->insertion_p ())
+ finish_column = start_column - 1;
+ else
+- finish_column
+- = location_compute_display_column (exploc_finish, context->tabstop);
++ finish_column = location_compute_display_column (exploc_finish, policy);
+ }
+ else
+ {
+@@ -2032,12 +2240,13 @@ get_affected_range (diagnostic_context *
+ /* Get the range of display columns that would be printed for HINT. */
+
+ static column_range
+-get_printed_columns (diagnostic_context *context, const fixit_hint *hint)
++get_printed_columns (const cpp_char_column_policy &policy,
++ const fixit_hint *hint)
+ {
+ expanded_location exploc = expand_location (hint->get_start_loc ());
+- int start_column = location_compute_display_column (exploc, context->tabstop);
++ int start_column = location_compute_display_column (exploc, policy);
+ int hint_width = cpp_display_width (hint->get_string (), hint->get_length (),
+- context->tabstop);
++ policy);
+ int final_hint_column = start_column + hint_width - 1;
+ if (hint->insertion_p ())
+ {
+@@ -2047,8 +2256,7 @@ get_printed_columns (diagnostic_context
+ {
+ exploc = expand_location (hint->get_next_loc ());
+ --exploc.column;
+- int finish_column
+- = location_compute_display_column (exploc, context->tabstop);
++ int finish_column = location_compute_display_column (exploc, policy);
+ return column_range (start_column,
+ MAX (finish_column, final_hint_column));
+ }
+@@ -2066,13 +2274,13 @@ public:
+ column_range affected_columns,
+ column_range printed_columns,
+ const char *new_text, size_t new_text_len,
+- int tabstop)
++ const cpp_char_column_policy &policy)
+ : m_affected_bytes (affected_bytes),
+ m_affected_columns (affected_columns),
+ m_printed_columns (printed_columns),
+ m_text (xstrdup (new_text)),
+ m_byte_length (new_text_len),
+- m_tabstop (tabstop),
++ m_policy (policy),
+ m_alloc_sz (new_text_len + 1)
+ {
+ compute_display_cols ();
+@@ -2090,7 +2298,7 @@ public:
+
+ void compute_display_cols ()
+ {
+- m_display_cols = cpp_display_width (m_text, m_byte_length, m_tabstop);
++ m_display_cols = cpp_display_width (m_text, m_byte_length, m_policy);
+ }
+
+ void overwrite (int dst_offset, const char_span &src_span)
+@@ -2118,7 +2326,7 @@ public:
+ char *m_text;
+ size_t m_byte_length; /* Not including null-terminator. */
+ int m_display_cols;
+- int m_tabstop;
++ const cpp_char_column_policy &m_policy;
+ size_t m_alloc_sz;
+ };
+
+@@ -2154,15 +2362,16 @@ correction::ensure_terminated ()
+ class line_corrections
+ {
+ public:
+- line_corrections (diagnostic_context *context, const char *filename,
++ line_corrections (const char_display_policy &policy,
++ const char *filename,
+ linenum_type row)
+- : m_context (context), m_filename (filename), m_row (row)
++ : m_policy (policy), m_filename (filename), m_row (row)
+ {}
+ ~line_corrections ();
+
+ void add_hint (const fixit_hint *hint);
+
+- diagnostic_context *m_context;
++ const char_display_policy &m_policy;
+ const char *m_filename;
+ linenum_type m_row;
+ auto_vec <correction *> m_corrections;
+@@ -2208,10 +2417,10 @@ source_line::source_line (const char *fi
+ void
+ line_corrections::add_hint (const fixit_hint *hint)
+ {
+- column_range affected_bytes = get_affected_range (m_context, hint, CU_BYTES);
+- column_range affected_columns = get_affected_range (m_context, hint,
++ column_range affected_bytes = get_affected_range (m_policy, hint, CU_BYTES);
++ column_range affected_columns = get_affected_range (m_policy, hint,
+ CU_DISPLAY_COLS);
+- column_range printed_columns = get_printed_columns (m_context, hint);
++ column_range printed_columns = get_printed_columns (m_policy, hint);
+
+ /* Potentially consolidate. */
+ if (!m_corrections.is_empty ())
+@@ -2280,7 +2489,7 @@ line_corrections::add_hint (const fixit_
+ printed_columns,
+ hint->get_string (),
+ hint->get_length (),
+- m_context->tabstop));
++ m_policy));
+ }
+
+ /* If there are any fixit hints on source line ROW, print them.
+@@ -2294,7 +2503,7 @@ layout::print_trailing_fixits (linenum_t
+ {
+ /* Build a list of correction instances for the line,
+ potentially consolidating hints (for the sake of readability). */
+- line_corrections corrections (m_context, m_exploc.file, row);
++ line_corrections corrections (m_policy, m_exploc.file, row);
+ for (unsigned int i = 0; i < m_fixit_hints.length (); i++)
+ {
+ const fixit_hint *hint = m_fixit_hints[i];
+@@ -2635,6 +2844,59 @@ namespace selftest {
+
+ /* Selftests for diagnostic_show_locus. */
+
++/* Verify that cpp_display_width correctly handles escaping. */
++
++static void
++test_display_widths ()
++{
++ gcc_rich_location richloc (UNKNOWN_LOCATION);
++
++ /* U+03C0 "GREEK SMALL LETTER PI". */
++ const char *pi = "\xCF\x80";
++ /* U+1F642 "SLIGHTLY SMILING FACE". */
++ const char *emoji = "\xF0\x9F\x99\x82";
++ /* Stray trailing byte of a UTF-8 character. */
++ const char *stray = "\xBF";
++ /* U+10FFFF. */
++ const char *max_codepoint = "\xF4\x8F\xBF\xBF";
++
++ /* No escaping. */
++ {
++ test_diagnostic_context dc;
++ char_display_policy policy (make_policy (dc, richloc));
++ ASSERT_EQ (cpp_display_width (pi, strlen (pi), policy), 1);
++ ASSERT_EQ (cpp_display_width (emoji, strlen (emoji), policy), 2);
++ ASSERT_EQ (cpp_display_width (stray, strlen (stray), policy), 1);
++ /* Don't check width of U+10FFFF; it's in a private use plane. */
++ }
++
++ richloc.set_escape_on_output (true);
++
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_UNICODE;
++ char_display_policy policy (make_policy (dc, richloc));
++ ASSERT_EQ (cpp_display_width (pi, strlen (pi), policy), 8);
++ ASSERT_EQ (cpp_display_width (emoji, strlen (emoji), policy), 9);
++ ASSERT_EQ (cpp_display_width (stray, strlen (stray), policy), 4);
++ ASSERT_EQ (cpp_display_width (max_codepoint, strlen (max_codepoint),
++ policy),
++ strlen ("<U+10FFFF>"));
++ }
++
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_BYTES;
++ char_display_policy policy (make_policy (dc, richloc));
++ ASSERT_EQ (cpp_display_width (pi, strlen (pi), policy), 8);
++ ASSERT_EQ (cpp_display_width (emoji, strlen (emoji), policy), 16);
++ ASSERT_EQ (cpp_display_width (stray, strlen (stray), policy), 4);
++ ASSERT_EQ (cpp_display_width (max_codepoint, strlen (max_codepoint),
++ policy),
++ 16);
++ }
++}
++
+ /* For precise tests of the layout, make clear where the source line will
+ start. test_left_margin sets the total byte count from the left side of the
+ screen to the start of source lines, after the line number and the separator,
+@@ -2704,10 +2966,10 @@ test_layout_x_offset_display_utf8 (const
+ char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+ ASSERT_EQ (line_display_cols,
+ cpp_display_width (lspan.get_buffer (), lspan.length (),
+- def_tabstop));
++ def_policy ()));
+ ASSERT_EQ (line_display_cols,
+ location_compute_display_column (expand_location (line_end),
+- def_tabstop));
++ def_policy ()));
+ ASSERT_EQ (0, memcmp (lspan.get_buffer () + (emoji_col - 1),
+ "\xf0\x9f\x98\x82\xf0\x9f\x98\x82", 8));
+
+@@ -2855,12 +3117,13 @@ test_layout_x_offset_display_tab (const
+ ASSERT_EQ ('\t', *(lspan.get_buffer () + (tab_col - 1)));
+ for (int tabstop = 1; tabstop != num_tabstops; ++tabstop)
+ {
++ cpp_char_column_policy policy (tabstop, cpp_wcwidth);
+ ASSERT_EQ (line_bytes + extra_width[tabstop],
+ cpp_display_width (lspan.get_buffer (), lspan.length (),
+- tabstop));
++ policy));
+ ASSERT_EQ (line_bytes + extra_width[tabstop],
+ location_compute_display_column (expand_location (line_end),
+- tabstop));
++ policy));
+ }
+
+ /* Check that the tab is expanded to the expected number of spaces. */
+@@ -3992,6 +4255,43 @@ test_one_liner_labels_utf8 ()
+ " bb\xf0\x9f\x98\x82\xf0\x9f\x98\x82\n",
+ pp_formatted_text (dc.printer));
+ }
++
++ /* Example of escaping the source lines. */
++ {
++ text_range_label label0 ("label 0\xf0\x9f\x98\x82");
++ text_range_label label1 ("label 1\xcf\x80");
++ text_range_label label2 ("label 2\xcf\x80");
++ gcc_rich_location richloc (foo, &label0);
++ richloc.add_range (bar, SHOW_RANGE_WITHOUT_CARET, &label1);
++ richloc.add_range (field, SHOW_RANGE_WITHOUT_CARET, &label2);
++ richloc.set_escape_on_output (true);
++
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_UNICODE;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ (" <U+1F602>_foo = <U+03C0>_bar.<U+1F602>_field<U+03C0>;\n"
++ " ^~~~~~~~~~~~~ ~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~\n"
++ " | | |\n"
++ " | | label 2\xcf\x80\n"
++ " | label 1\xcf\x80\n"
++ " label 0\xf0\x9f\x98\x82\n",
++ pp_formatted_text (dc.printer));
++ }
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_BYTES;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ
++ (" <f0><9f><98><82>_foo = <cf><80>_bar.<f0><9f><98><82>_field<cf><80>;\n"
++ " ^~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
++ " | | |\n"
++ " | | label 2\xcf\x80\n"
++ " | label 1\xcf\x80\n"
++ " label 0\xf0\x9f\x98\x82\n",
++ pp_formatted_text (dc.printer));
++ }
++ }
+ }
+
+ /* Make sure that colorization codes don't interrupt a multibyte
+@@ -4046,9 +4346,9 @@ test_diagnostic_show_locus_one_liner_utf
+
+ char_span lspan = location_get_source_line (tmp.get_filename (), 1);
+ ASSERT_EQ (25, cpp_display_width (lspan.get_buffer (), lspan.length (),
+- def_tabstop));
++ def_policy ()));
+ ASSERT_EQ (25, location_compute_display_column (expand_location (line_end),
+- def_tabstop));
++ def_policy ()));
+
+ test_one_liner_simple_caret_utf8 ();
+ test_one_liner_caret_and_range_utf8 ();
+@@ -4434,30 +4734,31 @@ test_overlapped_fixit_printing (const li
+ pp_formatted_text (dc.printer));
+
+ /* Unit-test the line_corrections machinery. */
++ char_display_policy policy (make_policy (dc, richloc));
+ ASSERT_EQ (3, richloc.get_num_fixit_hints ());
+ const fixit_hint *hint_0 = richloc.get_fixit_hint (0);
+ ASSERT_EQ (column_range (12, 12),
+- get_affected_range (&dc, hint_0, CU_BYTES));
++ get_affected_range (policy, hint_0, CU_BYTES));
+ ASSERT_EQ (column_range (12, 12),
+- get_affected_range (&dc, hint_0, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (12, 22), get_printed_columns (&dc, hint_0));
++ get_affected_range (policy, hint_0, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (12, 22), get_printed_columns (policy, hint_0));
+ const fixit_hint *hint_1 = richloc.get_fixit_hint (1);
+ ASSERT_EQ (column_range (18, 18),
+- get_affected_range (&dc, hint_1, CU_BYTES));
++ get_affected_range (policy, hint_1, CU_BYTES));
+ ASSERT_EQ (column_range (18, 18),
+- get_affected_range (&dc, hint_1, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (18, 20), get_printed_columns (&dc, hint_1));
++ get_affected_range (policy, hint_1, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (18, 20), get_printed_columns (policy, hint_1));
+ const fixit_hint *hint_2 = richloc.get_fixit_hint (2);
+ ASSERT_EQ (column_range (29, 28),
+- get_affected_range (&dc, hint_2, CU_BYTES));
++ get_affected_range (policy, hint_2, CU_BYTES));
+ ASSERT_EQ (column_range (29, 28),
+- get_affected_range (&dc, hint_2, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (29, 29), get_printed_columns (&dc, hint_2));
++ get_affected_range (policy, hint_2, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (29, 29), get_printed_columns (policy, hint_2));
+
+ /* Add each hint in turn to a line_corrections instance,
+ and verify that they are consolidated into one correction instance
+ as expected. */
+- line_corrections lc (&dc, tmp.get_filename (), 1);
++ line_corrections lc (policy, tmp.get_filename (), 1);
+
+ /* The first replace hint by itself. */
+ lc.add_hint (hint_0);
+@@ -4649,30 +4950,31 @@ test_overlapped_fixit_printing_utf8 (con
+ pp_formatted_text (dc.printer));
+
+ /* Unit-test the line_corrections machinery. */
++ char_display_policy policy (make_policy (dc, richloc));
+ ASSERT_EQ (3, richloc.get_num_fixit_hints ());
+ const fixit_hint *hint_0 = richloc.get_fixit_hint (0);
+ ASSERT_EQ (column_range (14, 14),
+- get_affected_range (&dc, hint_0, CU_BYTES));
++ get_affected_range (policy, hint_0, CU_BYTES));
+ ASSERT_EQ (column_range (12, 12),
+- get_affected_range (&dc, hint_0, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (12, 22), get_printed_columns (&dc, hint_0));
++ get_affected_range (policy, hint_0, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (12, 22), get_printed_columns (policy, hint_0));
+ const fixit_hint *hint_1 = richloc.get_fixit_hint (1);
+ ASSERT_EQ (column_range (22, 22),
+- get_affected_range (&dc, hint_1, CU_BYTES));
++ get_affected_range (policy, hint_1, CU_BYTES));
+ ASSERT_EQ (column_range (18, 18),
+- get_affected_range (&dc, hint_1, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (18, 20), get_printed_columns (&dc, hint_1));
++ get_affected_range (policy, hint_1, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (18, 20), get_printed_columns (policy, hint_1));
+ const fixit_hint *hint_2 = richloc.get_fixit_hint (2);
+ ASSERT_EQ (column_range (35, 34),
+- get_affected_range (&dc, hint_2, CU_BYTES));
++ get_affected_range (policy, hint_2, CU_BYTES));
+ ASSERT_EQ (column_range (30, 29),
+- get_affected_range (&dc, hint_2, CU_DISPLAY_COLS));
+- ASSERT_EQ (column_range (30, 30), get_printed_columns (&dc, hint_2));
++ get_affected_range (policy, hint_2, CU_DISPLAY_COLS));
++ ASSERT_EQ (column_range (30, 30), get_printed_columns (policy, hint_2));
+
+ /* Add each hint in turn to a line_corrections instance,
+ and verify that they are consolidated into one correction instance
+ as expected. */
+- line_corrections lc (&dc, tmp.get_filename (), 1);
++ line_corrections lc (policy, tmp.get_filename (), 1);
+
+ /* The first replace hint by itself. */
+ lc.add_hint (hint_0);
+@@ -4866,15 +5168,16 @@ test_overlapped_fixit_printing_2 (const
+ richloc.add_fixit_insert_before (col_21, "}");
+
+ /* These fixits should be accepted; they can't be consolidated. */
++ char_display_policy policy (make_policy (dc, richloc));
+ ASSERT_EQ (2, richloc.get_num_fixit_hints ());
+ const fixit_hint *hint_0 = richloc.get_fixit_hint (0);
+ ASSERT_EQ (column_range (23, 22),
+- get_affected_range (&dc, hint_0, CU_BYTES));
+- ASSERT_EQ (column_range (23, 23), get_printed_columns (&dc, hint_0));
++ get_affected_range (policy, hint_0, CU_BYTES));
++ ASSERT_EQ (column_range (23, 23), get_printed_columns (policy, hint_0));
+ const fixit_hint *hint_1 = richloc.get_fixit_hint (1);
+ ASSERT_EQ (column_range (21, 20),
+- get_affected_range (&dc, hint_1, CU_BYTES));
+- ASSERT_EQ (column_range (21, 21), get_printed_columns (&dc, hint_1));
++ get_affected_range (policy, hint_1, CU_BYTES));
++ ASSERT_EQ (column_range (21, 21), get_printed_columns (policy, hint_1));
+
+ /* Verify that they're printed correctly. */
+ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
+@@ -5141,10 +5444,11 @@ test_tab_expansion (const line_table_cas
+ ....................123 45678901234 56789012345 columns */
+
+ const int tabstop = 8;
++ cpp_char_column_policy policy (tabstop, cpp_wcwidth);
+ const int first_non_ws_byte_col = 7;
+ const int right_quote_byte_col = 15;
+ const int last_byte_col = 25;
+- ASSERT_EQ (35, cpp_display_width (content, last_byte_col, tabstop));
++ ASSERT_EQ (35, cpp_display_width (content, last_byte_col, policy));
+
+ temp_source_file tmp (SELFTEST_LOCATION, ".c", content);
+ line_table_test ltt (case_);
+@@ -5187,6 +5491,114 @@ test_tab_expansion (const line_table_cas
+ }
+ }
+
++/* Verify that the escaping machinery can cope with a variety of different
++ invalid bytes. */
++
++static void
++test_escaping_bytes_1 (const line_table_case &case_)
++{
++ const char content[] = "before\0\1\2\3\r\x80\xff""after\n";
++ const size_t sz = sizeof (content);
++ temp_source_file tmp (SELFTEST_LOCATION, ".c", content, sz);
++ line_table_test ltt (case_);
++ const line_map_ordinary *ord_map = linemap_check_ordinary
++ (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
++ linemap_line_start (line_table, 1, 100);
++
++ location_t finish
++ = linemap_position_for_line_and_column (line_table, ord_map, 1,
++ strlen (content));
++
++ if (finish > LINE_MAP_MAX_LOCATION_WITH_COLS)
++ return;
++
++ /* Locations of the NUL and \r bytes. */
++ location_t nul_loc
++ = linemap_position_for_line_and_column (line_table, ord_map, 1, 7);
++ location_t r_loc
++ = linemap_position_for_line_and_column (line_table, ord_map, 1, 11);
++ gcc_rich_location richloc (nul_loc);
++ richloc.add_range (r_loc);
++
++ {
++ test_diagnostic_context dc;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ (" before \1\2\3 \x80\xff""after\n"
++ " ^ ~\n",
++ pp_formatted_text (dc.printer));
++ }
++ richloc.set_escape_on_output (true);
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_UNICODE;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ
++ (" before<U+0000><U+0001><U+0002><U+0003><U+000D><80><ff>after\n"
++ " ^~~~~~~~ ~~~~~~~~\n",
++ pp_formatted_text (dc.printer));
++ }
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_BYTES;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ (" before<00><01><02><03><0d><80><ff>after\n"
++ " ^~~~ ~~~~\n",
++ pp_formatted_text (dc.printer));
++ }
++}
++
++/* As above, but verify that we handle the initial byte of a line
++ correctly. */
++
++static void
++test_escaping_bytes_2 (const line_table_case &case_)
++{
++ const char content[] = "\0after\n";
++ const size_t sz = sizeof (content);
++ temp_source_file tmp (SELFTEST_LOCATION, ".c", content, sz);
++ line_table_test ltt (case_);
++ const line_map_ordinary *ord_map = linemap_check_ordinary
++ (linemap_add (line_table, LC_ENTER, false, tmp.get_filename (), 0));
++ linemap_line_start (line_table, 1, 100);
++
++ location_t finish
++ = linemap_position_for_line_and_column (line_table, ord_map, 1,
++ strlen (content));
++
++ if (finish > LINE_MAP_MAX_LOCATION_WITH_COLS)
++ return;
++
++ /* Location of the NUL byte. */
++ location_t nul_loc
++ = linemap_position_for_line_and_column (line_table, ord_map, 1, 1);
++ gcc_rich_location richloc (nul_loc);
++
++ {
++ test_diagnostic_context dc;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ (" after\n"
++ " ^\n",
++ pp_formatted_text (dc.printer));
++ }
++ richloc.set_escape_on_output (true);
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_UNICODE;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ (" <U+0000>after\n"
++ " ^~~~~~~~\n",
++ pp_formatted_text (dc.printer));
++ }
++ {
++ test_diagnostic_context dc;
++ dc.escape_format = DIAGNOSTICS_ESCAPE_FORMAT_BYTES;
++ diagnostic_show_locus (&dc, &richloc, DK_ERROR);
++ ASSERT_STREQ (" <00>after\n"
++ " ^~~~\n",
++ pp_formatted_text (dc.printer));
++ }
++}
++
+ /* Verify that line numbers are correctly printed for the case of
+ a multiline range in which the width of the line numbers changes
+ (e.g. from "9" to "10"). */
+@@ -5243,6 +5655,8 @@ diagnostic_show_locus_c_tests ()
+ test_layout_range_for_single_line ();
+ test_layout_range_for_multiple_lines ();
+
++ test_display_widths ();
++
+ for_each_line_table_case (test_layout_x_offset_display_utf8);
+ for_each_line_table_case (test_layout_x_offset_display_tab);
+
+@@ -5263,6 +5677,8 @@ diagnostic_show_locus_c_tests ()
+ for_each_line_table_case (test_fixit_replace_containing_newline);
+ for_each_line_table_case (test_fixit_deletion_affecting_newline);
+ for_each_line_table_case (test_tab_expansion);
++ for_each_line_table_case (test_escaping_bytes_1);
++ for_each_line_table_case (test_escaping_bytes_2);
+
+ test_line_numbers_multiline_range ();
+ }
+diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
+--- a/gcc/doc/invoke.texi 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/doc/invoke.texi 2021-12-25 01:30:50.681688823 -0800
+@@ -295,7 +295,8 @@ Objective-C and Objective-C++ Dialects}.
+ -fdiagnostics-show-path-depths @gol
+ -fno-show-column @gol
+ -fdiagnostics-column-unit=@r{[}display@r{|}byte@r{]} @gol
+--fdiagnostics-column-origin=@var{origin}}
++-fdiagnostics-column-origin=@var{origin} @gol
++-fdiagnostics-escape-format=@r{[}unicode@r{|}bytes@r{]}}
+
+ @item Warning Options
+ @xref{Warning Options,,Options to Request or Suppress Warnings}.
+@@ -4451,6 +4452,38 @@ first column. The default value of 1 co
+ behavior and to the GNU style guide. Some utilities may perform better with an
+ origin of 0; any non-negative value may be specified.
+
++@item -fdiagnostics-escape-format=@var{FORMAT}
++@opindex fdiagnostics-escape-format
++When GCC prints pertinent source lines for a diagnostic it normally attempts
++to print the source bytes directly. However, some diagnostics relate to encoding
++issues in the source file, such as malformed UTF-8, or issues with Unicode
++normalization. These diagnostics are flagged so that GCC will escape bytes
++that are not printable ASCII when printing their pertinent source lines.
++
++This option controls how such bytes should be escaped.
++
++The default @var{FORMAT}, @samp{unicode} displays Unicode characters that
++are not printable ASCII in the form @samp{<U+XXXX>}, and bytes that do not
++correspond to a Unicode character validly-encoded in UTF-8-encoded will be
++displayed as hexadecimal in the form @samp{<XX>}.
++
++For example, a source line containing the string @samp{before} followed by the
++Unicode character U+03C0 (``GREEK SMALL LETTER PI'', with UTF-8 encoding
++0xCF 0x80) followed by the byte 0xBF (a stray UTF-8 trailing byte), followed by
++the string @samp{after} will be printed for such a diagnostic as:
++
++@smallexample
++ before<U+03C0><BF>after
++@end smallexample
++
++Setting @var{FORMAT} to @samp{bytes} will display all non-printable-ASCII bytes
++in the form @samp{<XX>}, thus showing the underlying encoding of non-ASCII
++Unicode characters. For the example above, the following will be printed:
++
++@smallexample
++ before<CF><80><BF>after
++@end smallexample
++
+ @item -fdiagnostics-format=@var{FORMAT}
+ @opindex fdiagnostics-format
+ Select a different format for printing diagnostics.
+@@ -4518,9 +4551,11 @@ might be printed in JSON form (after for
+ @}
+ @}
+ ],
++ "escape-source": false,
+ "message": "...this statement, but the latter is @dots{}"
+ @}
+ ]
++ "escape-source": false,
+ "column-origin": 1,
+ @},
+ @dots{}
+@@ -4607,6 +4642,7 @@ of the expression, which have labels. I
+ "label": "T @{aka struct t@}"
+ @}
+ ],
++ "escape-source": false,
+ "message": "invalid operands to binary + @dots{}"
+ @}
+ @end smallexample
+@@ -4660,6 +4696,7 @@ might be printed in JSON form as:
+ @}
+ @}
+ ],
++ "escape-source": false,
+ "message": "\u2018struct s\u2019 has no member named @dots{}"
+ @}
+ @end smallexample
+@@ -4717,6 +4754,10 @@ For example, the intraprocedural example
+ ]
+ @end smallexample
+
++Diagnostics have a boolean attribute @code{escape-source}, hinting whether
++non-ASCII bytes should be escaped when printing the pertinent lines of
++source code (@code{true} for diagnostics involving source encoding issues).
++
+ @end table
+
+ @node Warning Options
+diff --git a/gcc/input.c b/gcc/input.c
+--- a/gcc/input.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/input.c 2021-12-25 01:30:50.681688823 -0800
+@@ -913,7 +913,8 @@ make_location (location_t caret, source_
+ source line in order to calculate the display width. If that cannot be done
+ for any reason, then returns the byte column as a fallback. */
+ int
+-location_compute_display_column (expanded_location exploc, int tabstop)
++location_compute_display_column (expanded_location exploc,
++ const cpp_char_column_policy &policy)
+ {
+ if (!(exploc.file && *exploc.file && exploc.line && exploc.column))
+ return exploc.column;
+@@ -921,7 +922,7 @@ location_compute_display_column (expande
+ /* If line is NULL, this function returns exploc.column which is the
+ desired fallback. */
+ return cpp_byte_column_to_display_column (line.get_buffer (), line.length (),
+- exploc.column, tabstop);
++ exploc.column, policy);
+ }
+
+ /* Dump statistics to stderr about the memory usage of the line_table
+@@ -3609,43 +3610,50 @@ test_line_offset_overflow ()
+ void test_cpp_utf8 ()
+ {
+ const int def_tabstop = 8;
++ cpp_char_column_policy policy (def_tabstop, cpp_wcwidth);
++
+ /* Verify that wcwidth of invalid UTF-8 or control bytes is 1. */
+ {
+- int w_bad = cpp_display_width ("\xf0!\x9f!\x98!\x82!", 8, def_tabstop);
++ int w_bad = cpp_display_width ("\xf0!\x9f!\x98!\x82!", 8, policy);
+ ASSERT_EQ (8, w_bad);
+- int w_ctrl = cpp_display_width ("\r\n\v\0\1", 5, def_tabstop);
++ int w_ctrl = cpp_display_width ("\r\n\v\0\1", 5, policy);
+ ASSERT_EQ (5, w_ctrl);
+ }
+
+ /* Verify that wcwidth of valid UTF-8 is as expected. */
+ {
+- const int w_pi = cpp_display_width ("\xcf\x80", 2, def_tabstop);
++ const int w_pi = cpp_display_width ("\xcf\x80", 2, policy);
+ ASSERT_EQ (1, w_pi);
+- const int w_emoji = cpp_display_width ("\xf0\x9f\x98\x82", 4, def_tabstop);
++ const int w_emoji = cpp_display_width ("\xf0\x9f\x98\x82", 4, policy);
+ ASSERT_EQ (2, w_emoji);
+ const int w_umlaut_precomposed = cpp_display_width ("\xc3\xbf", 2,
+- def_tabstop);
++ policy);
+ ASSERT_EQ (1, w_umlaut_precomposed);
+ const int w_umlaut_combining = cpp_display_width ("y\xcc\x88", 3,
+- def_tabstop);
++ policy);
+ ASSERT_EQ (1, w_umlaut_combining);
+- const int w_han = cpp_display_width ("\xe4\xb8\xba", 3, def_tabstop);
++ const int w_han = cpp_display_width ("\xe4\xb8\xba", 3, policy);
+ ASSERT_EQ (2, w_han);
+- const int w_ascii = cpp_display_width ("GCC", 3, def_tabstop);
++ const int w_ascii = cpp_display_width ("GCC", 3, policy);
+ ASSERT_EQ (3, w_ascii);
+ const int w_mixed = cpp_display_width ("\xcf\x80 = 3.14 \xf0\x9f\x98\x82"
+ "\x9f! \xe4\xb8\xba y\xcc\x88",
+- 24, def_tabstop);
++ 24, policy);
+ ASSERT_EQ (18, w_mixed);
+ }
+
+ /* Verify that display width properly expands tabs. */
+ {
+ const char *tstr = "\tabc\td";
+- ASSERT_EQ (6, cpp_display_width (tstr, 6, 1));
+- ASSERT_EQ (10, cpp_display_width (tstr, 6, 3));
+- ASSERT_EQ (17, cpp_display_width (tstr, 6, 8));
+- ASSERT_EQ (1, cpp_display_column_to_byte_column (tstr, 6, 7, 8));
++ ASSERT_EQ (6, cpp_display_width (tstr, 6,
++ cpp_char_column_policy (1, cpp_wcwidth)));
++ ASSERT_EQ (10, cpp_display_width (tstr, 6,
++ cpp_char_column_policy (3, cpp_wcwidth)));
++ ASSERT_EQ (17, cpp_display_width (tstr, 6,
++ cpp_char_column_policy (8, cpp_wcwidth)));
++ ASSERT_EQ (1,
++ cpp_display_column_to_byte_column
++ (tstr, 6, 7, cpp_char_column_policy (8, cpp_wcwidth)));
+ }
+
+ /* Verify that cpp_byte_column_to_display_column can go past the end,
+@@ -3658,13 +3666,13 @@ void test_cpp_utf8 ()
+ /* 111122223456
+ Byte columns. */
+
+- ASSERT_EQ (5, cpp_display_width (str, 6, def_tabstop));
++ ASSERT_EQ (5, cpp_display_width (str, 6, policy));
+ ASSERT_EQ (105,
+- cpp_byte_column_to_display_column (str, 6, 106, def_tabstop));
++ cpp_byte_column_to_display_column (str, 6, 106, policy));
+ ASSERT_EQ (10000,
+- cpp_byte_column_to_display_column (NULL, 0, 10000, def_tabstop));
++ cpp_byte_column_to_display_column (NULL, 0, 10000, policy));
+ ASSERT_EQ (0,
+- cpp_byte_column_to_display_column (NULL, 10000, 0, def_tabstop));
++ cpp_byte_column_to_display_column (NULL, 10000, 0, policy));
+ }
+
+ /* Verify that cpp_display_column_to_byte_column can go past the end,
+@@ -3678,25 +3686,25 @@ void test_cpp_utf8 ()
+ /* 000000000000000000000000000000000111111
+ 111122223333444456666777788889999012345
+ Byte columns. */
+- ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 2, def_tabstop));
++ ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 2, policy));
+ ASSERT_EQ (15,
+- cpp_display_column_to_byte_column (str, 15, 11, def_tabstop));
++ cpp_display_column_to_byte_column (str, 15, 11, policy));
+ ASSERT_EQ (115,
+- cpp_display_column_to_byte_column (str, 15, 111, def_tabstop));
++ cpp_display_column_to_byte_column (str, 15, 111, policy));
+ ASSERT_EQ (10000,
+- cpp_display_column_to_byte_column (NULL, 0, 10000, def_tabstop));
++ cpp_display_column_to_byte_column (NULL, 0, 10000, policy));
+ ASSERT_EQ (0,
+- cpp_display_column_to_byte_column (NULL, 10000, 0, def_tabstop));
++ cpp_display_column_to_byte_column (NULL, 10000, 0, policy));
+
+ /* Verify that we do not interrupt a UTF-8 sequence. */
+- ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 1, def_tabstop));
++ ASSERT_EQ (4, cpp_display_column_to_byte_column (str, 15, 1, policy));
+
+ for (int byte_col = 1; byte_col <= 15; ++byte_col)
+ {
+ const int disp_col
+- = cpp_byte_column_to_display_column (str, 15, byte_col, def_tabstop);
++ = cpp_byte_column_to_display_column (str, 15, byte_col, policy);
+ const int byte_col2
+- = cpp_display_column_to_byte_column (str, 15, disp_col, def_tabstop);
++ = cpp_display_column_to_byte_column (str, 15, disp_col, policy);
+
+ /* If we ask for the display column in the middle of a UTF-8
+ sequence, it will return the length of the partial sequence,
+diff --git a/gcc/input.h b/gcc/input.h
+--- a/gcc/input.h 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/input.h 2021-12-25 01:30:50.681688823 -0800
+@@ -39,8 +39,11 @@ STATIC_ASSERT (BUILTINS_LOCATION < RESER
+ extern bool is_location_from_builtin_token (location_t);
+ extern expanded_location expand_location (location_t);
+
+-extern int location_compute_display_column (expanded_location exploc,
+- int tabstop);
++class cpp_char_column_policy;
++
++extern int
++location_compute_display_column (expanded_location exploc,
++ const cpp_char_column_policy &policy);
+
+ /* A class capturing the bounds of a buffer, to allow for run-time
+ bounds-checking in a checked build. */
+diff --git a/gcc/opts.c b/gcc/opts.c
+--- a/gcc/opts.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/opts.c 2021-12-25 01:30:50.681688823 -0800
+@@ -2447,6 +2447,10 @@ common_handle_option (struct gcc_options
+ dc->column_origin = value;
+ break;
+
++ case OPT_fdiagnostics_escape_format_:
++ dc->escape_format = (enum diagnostics_escape_format)value;
++ break;
++
+ case OPT_fdiagnostics_show_cwe:
+ dc->show_cwe = value;
+ break;
+diff --git a/gcc/selftest.c b/gcc/selftest.c
+--- a/gcc/selftest.c 2020-07-22 23:35:17.820389797 -0700
++++ b/gcc/selftest.c 2021-12-25 01:30:50.681688823 -0800
+@@ -193,6 +193,21 @@ temp_source_file::temp_source_file (cons
+ fclose (out);
+ }
+
++/* As above, but with a size, to allow for NUL bytes in CONTENT. */
++
++temp_source_file::temp_source_file (const location &loc,
++ const char *suffix,
++ const char *content,
++ size_t sz)
++: named_temp_file (suffix)
++{
++ FILE *out = fopen (get_filename (), "w");
++ if (!out)
++ fail_formatted (loc, "unable to open tempfile: %s", get_filename ());
++ fwrite (content, sz, 1, out);
++ fclose (out);
++}
++
+ /* Avoid introducing locale-specific differences in the results
+ by hardcoding open_quote and close_quote. */
+
+diff --git a/gcc/selftest.h b/gcc/selftest.h
+--- a/gcc/selftest.h 2020-07-22 23:35:17.820389797 -0700
++++ b/gcc/selftest.h 2021-12-25 01:30:50.681688823 -0800
+@@ -112,6 +112,8 @@ class temp_source_file : public named_te
+ public:
+ temp_source_file (const location &loc, const char *suffix,
+ const char *content);
++ temp_source_file (const location &loc, const char *suffix,
++ const char *content, size_t sz);
+ };
+
+ /* RAII-style class for avoiding introducing locale-specific differences
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-1.c 2021-12-25 01:30:50.681688823 -0800
+@@ -9,6 +9,7 @@
+
+ /* { dg-regexp "\"kind\": \"error\"" } */
+ /* { dg-regexp "\"column-origin\": 1" } */
++/* { dg-regexp "\"escape-source\": false" } */
+ /* { dg-regexp "\"message\": \"#error message\"" } */
+
+ /* { dg-regexp "\"caret\": \{" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-2.c 2021-12-25 01:30:50.681688823 -0800
+@@ -9,6 +9,7 @@
+
+ /* { dg-regexp "\"kind\": \"warning\"" } */
+ /* { dg-regexp "\"column-origin\": 1" } */
++/* { dg-regexp "\"escape-source\": false" } */
+ /* { dg-regexp "\"message\": \"#warning message\"" } */
+ /* { dg-regexp "\"option\": \"-Wcpp\"" } */
+ /* { dg-regexp "\"option_url\": \"https:\[^\n\r\"\]*#index-Wcpp\"" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-3.c 2021-12-25 01:30:50.681688823 -0800
+@@ -9,6 +9,7 @@
+
+ /* { dg-regexp "\"kind\": \"error\"" } */
+ /* { dg-regexp "\"column-origin\": 1" } */
++/* { dg-regexp "\"escape-source\": false" } */
+ /* { dg-regexp "\"message\": \"#warning message\"" } */
+ /* { dg-regexp "\"option\": \"-Werror=cpp\"" } */
+ /* { dg-regexp "\"option_url\": \"https:\[^\n\r\"\]*#index-Wcpp\"" } */
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-4.c 2021-12-25 01:30:50.681688823 -0800
+@@ -19,6 +19,7 @@ int test (void)
+
+ /* { dg-regexp "\"kind\": \"note\"" } */
+ /* { dg-regexp "\"message\": \"...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'\"" } */
++/* { dg-regexp "\"escape-source\": false" } */
+
+ /* { dg-regexp "\"caret\": \{" } */
+ /* { dg-regexp "\"file\": \"\[^\n\r\"\]*diagnostic-format-json-4.c\"" } */
+@@ -39,6 +40,7 @@ int test (void)
+ /* { dg-regexp "\"kind\": \"warning\"" } */
+ /* { dg-regexp "\"column-origin\": 1" } */
+ /* { dg-regexp "\"message\": \"this 'if' clause does not guard...\"" } */
++/* { dg-regexp "\"escape-source\": false" } */
+ /* { dg-regexp "\"option\": \"-Wmisleading-indentation\"" } */
+ /* { dg-regexp "\"option_url\": \"https:\[^\n\r\"\]*#index-Wmisleading-indentation\"" } */
+
+diff --git a/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c b/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c
+--- a/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c 2021-12-25 01:29:12.927317174 -0800
++++ b/gcc/testsuite/c-c++-common/diagnostic-format-json-5.c 2021-12-25 01:30:50.681688823 -0800
+@@ -14,6 +14,7 @@ int test (struct s *ptr)
+
+ /* { dg-regexp "\"kind\": \"error\"" } */
+ /* { dg-regexp "\"column-origin\": 1" } */
++/* { dg-regexp "\"escape-source\": false" } */
+ /* { dg-regexp "\"message\": \".*\"" } */
+
+ /* Verify fix-it hints. */
+diff --git a/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c b/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c
+--- a/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-bytes.c 2021-12-25 01:30:50.681688823 -0800
+@@ -0,0 +1,21 @@
++// { dg-do preprocess }
++// { dg-options "-std=gnu99 -Werror=normalized=nfc -fdiagnostics-show-caret -fdiagnostics-escape-format=bytes" }
++/* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
++
++/* འ= U+0F43 TIBETAN LETTER GHA, which has decomposition "0F42 0FB7" i.e.
++ U+0F42 TIBETAN LETTER GA: à½
++ U+0FB7 TIBETAN SUBJOINED LETTER HA: ྷ
++
++ The UTF-8 encoding of U+0F43 TIBETAN LETTER GHA is: E0 BD 83. */
++
++foo before_\u0F43_after bar // { dg-error "`before_.U00000f43_after' is not in NFC .-Werror=normalized=." }
++/* { dg-begin-multiline-output "" }
++ foo before_\u0F43_after bar
++ ^~~~~~~~~~~~~~~~~~~
++ { dg-end-multiline-output "" } */
++
++foo before_à½_after bar // { dg-error "`before_.U00000f43_after' is not in NFC .-Werror=normalized=." }
++/* { dg-begin-multiline-output "" }
++ foo before_<e0><bd><83>_after bar
++ ^~~~~~~~~~~~~~~~~~~~~~~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-unicode.c b/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-unicode.c
+--- a/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-unicode.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/gcc.dg/cpp/warn-normalized-4-unicode.c 2021-12-25 01:30:50.681688823 -0800
+@@ -0,0 +1,19 @@
++// { dg-do preprocess }
++// { dg-options "-std=gnu99 -Werror=normalized=nfc -fdiagnostics-show-caret -fdiagnostics-escape-format=unicode" }
++/* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
++
++/* འ= U+0F43 TIBETAN LETTER GHA, which has decomposition "0F42 0FB7" i.e.
++ U+0F42 TIBETAN LETTER GA: à½
++ U+0FB7 TIBETAN SUBJOINED LETTER HA: ྷ */
++
++foo before_\u0F43_after bar // { dg-error "`before_.U00000f43_after' is not in NFC .-Werror=normalized=." }
++/* { dg-begin-multiline-output "" }
++ foo before_\u0F43_after bar
++ ^~~~~~~~~~~~~~~~~~~
++ { dg-end-multiline-output "" } */
++
++foo before_à½_after bar // { dg-error "`before_.U00000f43_after' is not in NFC .-Werror=normalized=." }
++/* { dg-begin-multiline-output "" }
++ foo before_<U+0F43>_after bar
++ ^~~~~~~~~~~~~~~~~~~~~
++ { dg-end-multiline-output "" } */
+diff --git a/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90 b/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90
+--- a/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90 2021-12-25 01:29:12.931317107 -0800
++++ b/gcc/testsuite/gfortran.dg/diagnostic-format-json-1.F90 2021-12-25 01:30:50.681688823 -0800
+@@ -9,6 +9,7 @@
+
+ ! { dg-regexp "\"kind\": \"error\"" }
+ ! { dg-regexp "\"column-origin\": 1" }
++! { dg-regexp "\"escape-source\": false" }
+ ! { dg-regexp "\"message\": \"#error message\"" }
+
+ ! { dg-regexp "\"caret\": \{" }
+diff --git a/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90 b/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90
+--- a/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90 2021-12-25 01:29:12.931317107 -0800
++++ b/gcc/testsuite/gfortran.dg/diagnostic-format-json-2.F90 2021-12-25 01:30:50.681688823 -0800
+@@ -9,6 +9,7 @@
+
+ ! { dg-regexp "\"kind\": \"warning\"" }
+ ! { dg-regexp "\"column-origin\": 1" }
++! { dg-regexp "\"escape-source\": false" }
+ ! { dg-regexp "\"message\": \"#warning message\"" }
+ ! { dg-regexp "\"option\": \"-Wcpp\"" }
+ ! { dg-regexp "\"option_url\": \"\[^\n\r\"\]*#index-Wcpp\"" }
+diff --git a/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90 b/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90
+--- a/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90 2021-12-25 01:29:12.931317107 -0800
++++ b/gcc/testsuite/gfortran.dg/diagnostic-format-json-3.F90 2021-12-25 01:30:50.681688823 -0800
+@@ -9,6 +9,7 @@
+
+ ! { dg-regexp "\"kind\": \"error\"" }
+ ! { dg-regexp "\"column-origin\": 1" }
++! { dg-regexp "\"escape-source\": false" }
+ ! { dg-regexp "\"message\": \"#warning message\"" }
+ ! { dg-regexp "\"option\": \"-Werror=cpp\"" }
+ ! { dg-regexp "\"option_url\": \"\[^\n\r\"\]*#index-Wcpp\"" }
+diff --git a/libcpp/charset.c b/libcpp/charset.c
+--- a/libcpp/charset.c 2021-12-25 01:29:12.931317107 -0800
++++ b/libcpp/charset.c 2021-12-25 01:30:50.681688823 -0800
+@@ -1549,12 +1549,14 @@ convert_escape (cpp_reader *pfile, const
+ "unknown escape sequence: '\\%c'", (int) c);
+ else
+ {
++ encoding_rich_location rich_loc (pfile);
++
+ /* diagnostic.c does not support "%03o". When it does, this
+ code can use %03o directly in the diagnostic again. */
+ char buf[32];
+ sprintf(buf, "%03o", (int) c);
+- cpp_error (pfile, CPP_DL_PEDWARN,
+- "unknown escape sequence: '\\%s'", buf);
++ cpp_error_at (pfile, CPP_DL_PEDWARN, &rich_loc,
++ "unknown escape sequence: '\\%s'", buf);
+ }
+ }
+
+@@ -2277,14 +2279,16 @@ cpp_string_location_reader::get_next ()
+ }
+
+ cpp_display_width_computation::
+-cpp_display_width_computation (const char *data, int data_length, int tabstop) :
++cpp_display_width_computation (const char *data, int data_length,
++ const cpp_char_column_policy &policy) :
+ m_begin (data),
+ m_next (m_begin),
+ m_bytes_left (data_length),
+- m_tabstop (tabstop),
++ m_policy (policy),
+ m_display_cols (0)
+ {
+- gcc_assert (m_tabstop > 0);
++ gcc_assert (policy.m_tabstop > 0);
++ gcc_assert (policy.m_width_cb);
+ }
+
+
+@@ -2296,19 +2300,28 @@ cpp_display_width_computation (const cha
+ point to a valid UTF-8-encoded sequence, then it will be treated as a single
+ byte with display width 1. m_cur_display_col is the current display column,
+ relative to which tab stops should be expanded. Returns the display width of
+- the codepoint just processed. */
++ the codepoint just processed.
++ If OUT is non-NULL, it is populated. */
+
+ int
+-cpp_display_width_computation::process_next_codepoint ()
++cpp_display_width_computation::process_next_codepoint (cpp_decoded_char *out)
+ {
+ cppchar_t c;
+ int next_width;
+
++ if (out)
++ out->m_start_byte = m_next;
++
+ if (*m_next == '\t')
+ {
+ ++m_next;
+ --m_bytes_left;
+- next_width = m_tabstop - (m_display_cols % m_tabstop);
++ next_width = m_policy.m_tabstop - (m_display_cols % m_policy.m_tabstop);
++ if (out)
++ {
++ out->m_ch = '\t';
++ out->m_valid_ch = true;
++ }
+ }
+ else if (one_utf8_to_cppchar ((const uchar **) &m_next, &m_bytes_left, &c)
+ != 0)
+@@ -2318,14 +2331,24 @@ cpp_display_width_computation::process_n
+ of one. */
+ ++m_next;
+ --m_bytes_left;
+- next_width = 1;
++ next_width = m_policy.m_undecoded_byte_width;
++ if (out)
++ out->m_valid_ch = false;
+ }
+ else
+ {
+ /* one_utf8_to_cppchar() has updated m_next and m_bytes_left for us. */
+- next_width = cpp_wcwidth (c);
++ next_width = m_policy.m_width_cb (c);
++ if (out)
++ {
++ out->m_ch = c;
++ out->m_valid_ch = true;
++ }
+ }
+
++ if (out)
++ out->m_next_byte = m_next;
++
+ m_display_cols += next_width;
+ return next_width;
+ }
+@@ -2341,7 +2364,7 @@ cpp_display_width_computation::advance_d
+ const int start = m_display_cols;
+ const int target = start + n;
+ while (m_display_cols < target && !done ())
+- process_next_codepoint ();
++ process_next_codepoint (NULL);
+ return m_display_cols - start;
+ }
+
+@@ -2349,29 +2372,33 @@ cpp_display_width_computation::advance_d
+ how many display columns are occupied by the first COLUMN bytes. COLUMN
+ may exceed DATA_LENGTH, in which case the phantom bytes at the end are
+ treated as if they have display width 1. Tabs are expanded to the next tab
+- stop, relative to the start of DATA. */
++ stop, relative to the start of DATA, and non-printable-ASCII characters
++ will be escaped as per POLICY. */
+
+ int
+ cpp_byte_column_to_display_column (const char *data, int data_length,
+- int column, int tabstop)
++ int column,
++ const cpp_char_column_policy &policy)
+ {
+ const int offset = MAX (0, column - data_length);
+- cpp_display_width_computation dw (data, column - offset, tabstop);
++ cpp_display_width_computation dw (data, column - offset, policy);
+ while (!dw.done ())
+- dw.process_next_codepoint ();
++ dw.process_next_codepoint (NULL);
+ return dw.display_cols_processed () + offset;
+ }
+
+ /* For the string of length DATA_LENGTH bytes that begins at DATA, compute
+ the least number of bytes that will result in at least DISPLAY_COL display
+ columns. The return value may exceed DATA_LENGTH if the entire string does
+- not occupy enough display columns. */
++ not occupy enough display columns. Non-printable-ASCII characters
++ will be escaped as per POLICY. */
+
+ int
+ cpp_display_column_to_byte_column (const char *data, int data_length,
+- int display_col, int tabstop)
++ int display_col,
++ const cpp_char_column_policy &policy)
+ {
+- cpp_display_width_computation dw (data, data_length, tabstop);
++ cpp_display_width_computation dw (data, data_length, policy);
+ const int avail_display = dw.advance_display_cols (display_col);
+ return dw.bytes_processed () + MAX (0, display_col - avail_display);
+ }
+diff --git a/libcpp/errors.c b/libcpp/errors.c
+--- a/libcpp/errors.c 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/errors.c 2021-12-25 01:30:50.681688823 -0800
+@@ -27,6 +27,31 @@ along with this program; see the file CO
+ #include "cpplib.h"
+ #include "internal.h"
+
++/* Get a location_t for the current location in PFILE,
++ generally that of the previously lexed token. */
++
++location_t
++cpp_diagnostic_get_current_location (cpp_reader *pfile)
++{
++ if (CPP_OPTION (pfile, traditional))
++ {
++ if (pfile->state.in_directive)
++ return pfile->directive_line;
++ else
++ return pfile->line_table->highest_line;
++ }
++ /* We don't want to refer to a token before the beginning of the
++ current run -- that is invalid. */
++ else if (pfile->cur_token == pfile->cur_run->base)
++ {
++ return 0;
++ }
++ else
++ {
++ return pfile->cur_token[-1].src_loc;
++ }
++}
++
+ /* Print a diagnostic at the given location. */
+
+ ATTRIBUTE_FPTR_PRINTF(5,0)
+@@ -52,25 +77,7 @@ cpp_diagnostic (cpp_reader * pfile, enum
+ enum cpp_warning_reason reason,
+ const char *msgid, va_list *ap)
+ {
+- location_t src_loc;
+-
+- if (CPP_OPTION (pfile, traditional))
+- {
+- if (pfile->state.in_directive)
+- src_loc = pfile->directive_line;
+- else
+- src_loc = pfile->line_table->highest_line;
+- }
+- /* We don't want to refer to a token before the beginning of the
+- current run -- that is invalid. */
+- else if (pfile->cur_token == pfile->cur_run->base)
+- {
+- src_loc = 0;
+- }
+- else
+- {
+- src_loc = pfile->cur_token[-1].src_loc;
+- }
++ location_t src_loc = cpp_diagnostic_get_current_location (pfile);
+ rich_location richloc (pfile->line_table, src_loc);
+ return cpp_diagnostic_at (pfile, level, reason, &richloc, msgid, ap);
+ }
+@@ -142,6 +149,43 @@ cpp_warning_syshdr (cpp_reader * pfile,
+
+ va_end (ap);
+ return ret;
++}
++
++/* As cpp_warning above, but use RICHLOC as the location of the diagnostic. */
++
++bool cpp_warning_at (cpp_reader *pfile, enum cpp_warning_reason reason,
++ rich_location *richloc, const char *msgid, ...)
++{
++ va_list ap;
++ bool ret;
++
++ va_start (ap, msgid);
++
++ ret = cpp_diagnostic_at (pfile, CPP_DL_WARNING, reason, richloc,
++ msgid, &ap);
++
++ va_end (ap);
++ return ret;
++
++}
++
++/* As cpp_pedwarning above, but use RICHLOC as the location of the
++ diagnostic. */
++
++bool
++cpp_pedwarning_at (cpp_reader * pfile, enum cpp_warning_reason reason,
++ rich_location *richloc, const char *msgid, ...)
++{
++ va_list ap;
++ bool ret;
++
++ va_start (ap, msgid);
++
++ ret = cpp_diagnostic_at (pfile, CPP_DL_PEDWARN, reason, richloc,
++ msgid, &ap);
++
++ va_end (ap);
++ return ret;
+ }
+
+ /* Print a diagnostic at a specific location. */
+diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
+--- a/libcpp/include/cpplib.h 2021-12-25 01:29:12.931317107 -0800
++++ b/libcpp/include/cpplib.h 2021-12-25 01:30:50.685688757 -0800
+@@ -1176,6 +1176,14 @@ extern bool cpp_warning_syshdr (cpp_read
+ const char *msgid, ...)
+ ATTRIBUTE_PRINTF_3;
+
++/* As their counterparts above, but use RICHLOC. */
++extern bool cpp_warning_at (cpp_reader *, enum cpp_warning_reason,
++ rich_location *richloc, const char *msgid, ...)
++ ATTRIBUTE_PRINTF_4;
++extern bool cpp_pedwarning_at (cpp_reader *, enum cpp_warning_reason,
++ rich_location *richloc, const char *msgid, ...)
++ ATTRIBUTE_PRINTF_4;
++
+ /* Output a diagnostic with "MSGID: " preceding the
+ error string of errno. No location is printed. */
+ extern bool cpp_errno (cpp_reader *, enum cpp_diagnostic_level,
+@@ -1320,42 +1328,95 @@ extern const char * cpp_get_userdef_suff
+
+ /* In charset.c */
+
++/* The result of attempting to decode a run of UTF-8 bytes. */
++
++struct cpp_decoded_char
++{
++ const char *m_start_byte;
++ const char *m_next_byte;
++
++ bool m_valid_ch;
++ cppchar_t m_ch;
++};
++
++/* Information for mapping between code points and display columns.
++
++ This is a tabstop value, along with a callback for getting the
++ widths of characters. Normally this callback is cpp_wcwidth, but we
++ support other schemes for escaping non-ASCII unicode as a series of
++ ASCII chars when printing the user's source code in diagnostic-show-locus.c
++
++ For example, consider:
++ - the Unicode character U+03C0 "GREEK SMALL LETTER PI" (UTF-8: 0xCF 0x80)
++ - the Unicode character U+1F642 "SLIGHTLY SMILING FACE"
++ (UTF-8: 0xF0 0x9F 0x99 0x82)
++ - the byte 0xBF (a stray trailing byte of a UTF-8 character)
++ Normally U+03C0 would occupy one display column, U+1F642
++ would occupy two display columns, and the stray byte would be
++ printed verbatim as one display column.
++
++ However when escaping them as unicode code points as "<U+03C0>"
++ and "<U+1F642>" they occupy 8 and 9 display columns respectively,
++ and when escaping them as bytes as "<CF><80>" and "<F0><9F><99><82>"
++ they occupy 8 and 16 display columns respectively. In both cases
++ the stray byte is escaped to <BF> as 4 display columns. */
++
++struct cpp_char_column_policy
++{
++ cpp_char_column_policy (int tabstop,
++ int (*width_cb) (cppchar_t c))
++ : m_tabstop (tabstop),
++ m_undecoded_byte_width (1),
++ m_width_cb (width_cb)
++ {}
++
++ int m_tabstop;
++ /* Width in display columns of a stray byte that isn't decodable
++ as UTF-8. */
++ int m_undecoded_byte_width;
++ int (*m_width_cb) (cppchar_t c);
++};
++
+ /* A class to manage the state while converting a UTF-8 sequence to cppchar_t
+ and computing the display width one character at a time. */
+ class cpp_display_width_computation {
+ public:
+ cpp_display_width_computation (const char *data, int data_length,
+- int tabstop);
++ const cpp_char_column_policy &policy);
+ const char *next_byte () const { return m_next; }
+ int bytes_processed () const { return m_next - m_begin; }
+ int bytes_left () const { return m_bytes_left; }
+ bool done () const { return !bytes_left (); }
+ int display_cols_processed () const { return m_display_cols; }
+
+- int process_next_codepoint ();
++ int process_next_codepoint (cpp_decoded_char *out);
+ int advance_display_cols (int n);
+
+ private:
+ const char *const m_begin;
+ const char *m_next;
+ size_t m_bytes_left;
+- const int m_tabstop;
++ const cpp_char_column_policy &m_policy;
+ int m_display_cols;
+ };
+
+ /* Convenience functions that are simple use cases for class
+ cpp_display_width_computation. Tab characters will be expanded to spaces
+- as determined by TABSTOP. */
++ as determined by POLICY.m_tabstop, and non-printable-ASCII characters
++ will be escaped as per POLICY. */
++
+ int cpp_byte_column_to_display_column (const char *data, int data_length,
+- int column, int tabstop);
++ int column,
++ const cpp_char_column_policy &policy);
+ inline int cpp_display_width (const char *data, int data_length,
+- int tabstop)
++ const cpp_char_column_policy &policy)
+ {
+ return cpp_byte_column_to_display_column (data, data_length, data_length,
+- tabstop);
++ policy);
+ }
+ int cpp_display_column_to_byte_column (const char *data, int data_length,
+- int display_col, int tabstop);
++ int display_col,
++ const cpp_char_column_policy &policy);
+ int cpp_wcwidth (cppchar_t c);
+
+ #endif /* ! LIBCPP_CPPLIB_H */
+diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h
+--- a/libcpp/include/line-map.h 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/include/line-map.h 2021-12-25 01:30:50.685688757 -0800
+@@ -1732,6 +1732,18 @@ class rich_location
+ const diagnostic_path *get_path () const { return m_path; }
+ void set_path (const diagnostic_path *path) { m_path = path; }
+
++ /* A flag for hinting that the diagnostic involves character encoding
++ issues, and thus that it will be helpful to the user if we show some
++ representation of how the characters in the pertinent source lines
++ are encoded.
++ The default is false (i.e. do not escape).
++ When set to true, non-ASCII bytes in the pertinent source lines will
++ be escaped in a manner controlled by the user-supplied option
++ -fdiagnostics-escape-format=, so that the user can better understand
++ what's going on with the encoding in their source file. */
++ bool escape_on_output_p () const { return m_escape_on_output; }
++ void set_escape_on_output (bool flag) { m_escape_on_output = flag; }
++
+ private:
+ bool reject_impossible_fixit (location_t where);
+ void stop_supporting_fixits ();
+@@ -1758,6 +1770,7 @@ protected:
+ bool m_fixits_cannot_be_auto_applied;
+
+ const diagnostic_path *m_path;
++ bool m_escape_on_output;
+ };
+
+ /* A struct for the result of range_label::get_text: a NUL-terminated buffer
+diff --git a/libcpp/internal.h b/libcpp/internal.h
+--- a/libcpp/internal.h 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/internal.h 2021-12-25 01:30:50.685688757 -0800
+@@ -758,6 +758,9 @@ struct _cpp_dir_only_callbacks
+ extern void _cpp_preprocess_dir_only (cpp_reader *,
+ const struct _cpp_dir_only_callbacks *);
+
++/* In errors.c */
++extern location_t cpp_diagnostic_get_current_location (cpp_reader *);
++
+ /* In traditional.c. */
+ extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *, bool);
+ extern bool _cpp_read_logical_line_trad (cpp_reader *);
+@@ -946,6 +949,26 @@ int linemap_get_expansion_line (class li
+ const char* linemap_get_expansion_filename (class line_maps *,
+ location_t);
+
++/* A subclass of rich_location for emitting a diagnostic
++ at the current location of the reader, but flagging
++ it with set_escape_on_output (true). */
++class encoding_rich_location : public rich_location
++{
++ public:
++ encoding_rich_location (cpp_reader *pfile)
++ : rich_location (pfile->line_table,
++ cpp_diagnostic_get_current_location (pfile))
++ {
++ set_escape_on_output (true);
++ }
++
++ encoding_rich_location (cpp_reader *pfile, location_t loc)
++ : rich_location (pfile->line_table, loc)
++ {
++ set_escape_on_output (true);
++ }
++};
++
+ #ifdef __cplusplus
+ }
+ #endif
+diff --git a/libcpp/lex.c b/libcpp/lex.c
+--- a/libcpp/lex.c 2021-12-24 20:23:45.568762024 -0800
++++ b/libcpp/lex.c 2021-12-25 01:30:50.685688757 -0800
+@@ -1268,7 +1268,11 @@ skip_whitespace (cpp_reader *pfile, cppc
+ while (is_nvspace (c));
+
+ if (saw_NUL)
+- cpp_error (pfile, CPP_DL_WARNING, "null character(s) ignored");
++ {
++ encoding_rich_location rich_loc (pfile);
++ cpp_error_at (pfile, CPP_DL_WARNING, &rich_loc,
++ "null character(s) ignored");
++ }
+
+ buffer->cur--;
+ }
+@@ -1297,6 +1301,28 @@ warn_about_normalization (cpp_reader *pf
+ if (CPP_OPTION (pfile, warn_normalize) < NORMALIZE_STATE_RESULT (s)
+ && !pfile->state.skipping)
+ {
++ location_t loc = token->src_loc;
++
++ /* If possible, create a location range for the token. */
++ if (loc >= RESERVED_LOCATION_COUNT
++ && token->type != CPP_EOF
++ /* There must be no line notes to process. */
++ && (!(pfile->buffer->cur
++ >= pfile->buffer->notes[pfile->buffer->cur_note].pos
++ && !pfile->overlaid_buffer)))
++ {
++ source_range tok_range;
++ tok_range.m_start = loc;
++ tok_range.m_finish
++ = linemap_position_for_column (pfile->line_table,
++ CPP_BUF_COLUMN (pfile->buffer,
++ pfile->buffer->cur));
++ loc = COMBINE_LOCATION_DATA (pfile->line_table,
++ loc, tok_range, NULL);
++ }
++
++ encoding_rich_location rich_loc (pfile, loc);
++
+ /* Make sure that the token is printed using UCNs, even
+ if we'd otherwise happily print UTF-8. */
+ unsigned char *buf = XNEWVEC (unsigned char, cpp_token_len (token));
+@@ -1304,11 +1330,11 @@ warn_about_normalization (cpp_reader *pf
+
+ sz = cpp_spell_token (pfile, token, buf, false) - buf;
+ if (NORMALIZE_STATE_RESULT (s) == normalized_C)
+- cpp_warning_with_line (pfile, CPP_W_NORMALIZE, token->src_loc, 0,
+- "`%.*s' is not in NFKC", (int) sz, buf);
++ cpp_warning_at (pfile, CPP_W_NORMALIZE, &rich_loc,
++ "`%.*s' is not in NFKC", (int) sz, buf);
+ else
+- cpp_warning_with_line (pfile, CPP_W_NORMALIZE, token->src_loc, 0,
+- "`%.*s' is not in NFC", (int) sz, buf);
++ cpp_warning_at (pfile, CPP_W_NORMALIZE, &rich_loc,
++ "`%.*s' is not in NFC", (int) sz, buf);
+ free (buf);
+ }
+ }
+diff --git a/libcpp/line-map.c b/libcpp/line-map.c
+--- a/libcpp/line-map.c 2020-07-22 23:35:18.712399623 -0700
++++ b/libcpp/line-map.c 2021-12-25 01:30:50.685688757 -0800
+@@ -2007,7 +2007,8 @@ rich_location::rich_location (line_maps
+ m_fixit_hints (),
+ m_seen_impossible_fixit (false),
+ m_fixits_cannot_be_auto_applied (false),
+- m_path (NULL)
++ m_path (NULL),
++ m_escape_on_output (false)
+ {
+ add_range (loc, SHOW_RANGE_WITH_CARET, label);
+ }
diff --git a/meta/recipes-devtools/gcc/gcc/0003-CVE-2021-42574.patch b/meta/recipes-devtools/gcc/gcc/0003-CVE-2021-42574.patch
new file mode 100644
index 0000000000..6bfaf8402d
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0003-CVE-2021-42574.patch
@@ -0,0 +1,1724 @@
+From 51c500269bf53749b107807d84271385fad35628 Mon Sep 17 00:00:00 2001
+From: Marek Polacek <polacek@redhat.com>
+Date: Wed, 6 Oct 2021 14:33:59 -0400
+Subject: [PATCH] libcpp: Implement -Wbidi-chars for CVE-2021-42574 [PR103026]
+
+From a link below:
+"An issue was discovered in the Bidirectional Algorithm in the Unicode
+Specification through 14.0. It permits the visual reordering of
+characters via control sequences, which can be used to craft source code
+that renders different logic than the logical ordering of tokens
+ingested by compilers and interpreters. Adversaries can leverage this to
+encode source code for compilers accepting Unicode such that targeted
+vulnerabilities are introduced invisibly to human reviewers."
+
+More info:
+https://nvd.nist.gov/vuln/detail/CVE-2021-42574
+https://trojansource.codes/
+
+This is not a compiler bug. However, to mitigate the problem, this patch
+implements -Wbidi-chars=[none|unpaired|any] to warn about possibly
+misleading Unicode bidirectional control characters the preprocessor may
+encounter.
+
+The default is =unpaired, which warns about improperly terminated
+bidirectional control characters; e.g. a LRE without its corresponding PDF.
+The level =any warns about any use of bidirectional control characters.
+
+This patch handles both UCNs and UTF-8 characters. UCNs designating
+bidi characters in identifiers are accepted since r204886. Then r217144
+enabled -fextended-identifiers by default. Extended characters in C/C++
+identifiers have been accepted since r275979. However, this patch still
+warns about mixing UTF-8 and UCN bidi characters; there seems to be no
+good reason to allow mixing them.
+
+We warn in different contexts: comments (both C and C++-style), string
+literals, character constants, and identifiers. Expectedly, UCNs are ignored
+in comments and raw string literals. The bidirectional control characters
+can nest so this patch handles that as well.
+
+I have not included nor tested this at all with Fortran (which also has
+string literals and line comments).
+
+Dave M. posted patches improving diagnostic involving Unicode characters.
+This patch does not make use of this new infrastructure yet.
+
+ PR preprocessor/103026
+
+gcc/c-family/ChangeLog:
+
+ * c.opt (Wbidi-chars, Wbidi-chars=): New option.
+
+gcc/ChangeLog:
+
+ * doc/invoke.texi: Document -Wbidi-chars.
+
+libcpp/ChangeLog:
+
+ * include/cpplib.h (enum cpp_bidirectional_level): New.
+ (struct cpp_options): Add cpp_warn_bidirectional.
+ (enum cpp_warning_reason): Add CPP_W_BIDIRECTIONAL.
+ * internal.h (struct cpp_reader): Add warn_bidi_p member
+ function.
+ * init.c (cpp_create_reader): Set cpp_warn_bidirectional.
+ * lex.c (bidi): New namespace.
+ (get_bidi_utf8): New function.
+ (get_bidi_ucn): Likewise.
+ (maybe_warn_bidi_on_close): Likewise.
+ (maybe_warn_bidi_on_char): Likewise.
+ (_cpp_skip_block_comment): Implement warning about bidirectional
+ control characters.
+ (skip_line_comment): Likewise.
+ (forms_identifier_p): Likewise.
+ (lex_identifier): Likewise.
+ (lex_string): Likewise.
+ (lex_raw_string): Likewise.
+
+gcc/testsuite/ChangeLog:
+
+ * c-c++-common/Wbidi-chars-1.c: New test.
+ * c-c++-common/Wbidi-chars-2.c: New test.
+ * c-c++-common/Wbidi-chars-3.c: New test.
+ * c-c++-common/Wbidi-chars-4.c: New test.
+ * c-c++-common/Wbidi-chars-5.c: New test.
+ * c-c++-common/Wbidi-chars-6.c: New test.
+ * c-c++-common/Wbidi-chars-7.c: New test.
+ * c-c++-common/Wbidi-chars-8.c: New test.
+ * c-c++-common/Wbidi-chars-9.c: New test.
+ * c-c++-common/Wbidi-chars-10.c: New test.
+ * c-c++-common/Wbidi-chars-11.c: New test.
+ * c-c++-common/Wbidi-chars-12.c: New test.
+ * c-c++-common/Wbidi-chars-13.c: New test.
+ * c-c++-common/Wbidi-chars-14.c: New test.
+ * c-c++-common/Wbidi-chars-15.c: New test.
+ * c-c++-common/Wbidi-chars-16.c: New test.
+ * c-c++-common/Wbidi-chars-17.c: New test.
+
+CVE: CVE-2021-42574
+Upstream-Status: Backport [https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=51c500269bf53749b107807d84271385fad35628]
+Signed-off-by: Pgowda <pgowda.cve@gmail.com>
+
+---
+ gcc/c-family/c.opt | 24 ++
+ gcc/doc/invoke.texi | 21 +-
+ gcc/testsuite/c-c++-common/Wbidi-chars-1.c | 12 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-10.c | 27 ++
+ gcc/testsuite/c-c++-common/Wbidi-chars-11.c | 13 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-12.c | 19 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-13.c | 17 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-14.c | 38 ++
+ gcc/testsuite/c-c++-common/Wbidi-chars-15.c | 59 +++
+ gcc/testsuite/c-c++-common/Wbidi-chars-16.c | 26 ++
+ gcc/testsuite/c-c++-common/Wbidi-chars-17.c | 30 ++
+ gcc/testsuite/c-c++-common/Wbidi-chars-2.c | 9 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-3.c | 11 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-4.c | 188 +++++++++
+ gcc/testsuite/c-c++-common/Wbidi-chars-5.c | 188 +++++++++
+ gcc/testsuite/c-c++-common/Wbidi-chars-6.c | 155 ++++++++
+ gcc/testsuite/c-c++-common/Wbidi-chars-7.c | 9 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-8.c | 13 +
+ gcc/testsuite/c-c++-common/Wbidi-chars-9.c | 29 ++
+ libcpp/include/cpplib.h | 18 +-
+ libcpp/init.c | 1 +
+ libcpp/internal.h | 7 +
+ libcpp/lex.c | 408 +++++++++++++++++++-
+ 23 files changed, 1315 insertions(+), 7 deletions(-)
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-1.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-10.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-11.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-12.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-13.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-14.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-15.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-16.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-17.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-2.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-3.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-4.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-5.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-6.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-7.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-8.c
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-9.c
+
+diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
+--- a/gcc/c-family/c.opt 2021-12-25 01:29:12.915317374 -0800
++++ b/gcc/c-family/c.opt 2021-12-25 01:36:22.040018701 -0800
+@@ -350,6 +350,30 @@ Wbad-function-cast
+ C ObjC Var(warn_bad_function_cast) Warning
+ Warn about casting functions to incompatible types.
+
++Wbidi-chars
++C ObjC C++ ObjC++ Warning Alias(Wbidi-chars=,any,none)
++;
++
++Wbidi-chars=
++C ObjC C++ ObjC++ RejectNegative Joined Warning CPP(cpp_warn_bidirectional) CppReason(CPP_W_BIDIRECTIONAL) Var(warn_bidirectional) Init(bidirectional_unpaired) Enum(cpp_bidirectional_level)
++-Wbidi-chars=[none|unpaired|any] Warn about UTF-8 bidirectional control characters.
++
++; Required for these enum values.
++SourceInclude
++cpplib.h
++
++Enum
++Name(cpp_bidirectional_level) Type(int) UnknownError(argument %qs to %<-Wbidi-chars%> not recognized)
++
++EnumValue
++Enum(cpp_bidirectional_level) String(none) Value(bidirectional_none)
++
++EnumValue
++Enum(cpp_bidirectional_level) String(unpaired) Value(bidirectional_unpaired)
++
++EnumValue
++Enum(cpp_bidirectional_level) String(any) Value(bidirectional_any)
++
+ Wbool-compare
+ C ObjC C++ ObjC++ Var(warn_bool_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
+ Warn about boolean expression compared with an integer value different from true/false.
+diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
+--- a/gcc/doc/invoke.texi 2021-12-25 01:35:33.284883488 -0800
++++ b/gcc/doc/invoke.texi 2021-12-25 01:36:22.048018559 -0800
+@@ -310,7 +310,9 @@ Objective-C and Objective-C++ Dialects}.
+ -Warith-conversion @gol
+ -Warray-bounds -Warray-bounds=@var{n} @gol
+ -Wno-attributes -Wattribute-alias=@var{n} -Wno-attribute-alias @gol
+--Wno-attribute-warning -Wbool-compare -Wbool-operation @gol
++-Wno-attribute-warning @gol
++-Wbidi-chars=@r{[}none@r{|}unpaired@r{|}any@r{]} @gol
++-Wbool-compare -Wbool-operation @gol
+ -Wno-builtin-declaration-mismatch @gol
+ -Wno-builtin-macro-redefined -Wc90-c99-compat -Wc99-c11-compat @gol
+ -Wc11-c2x-compat @gol
+@@ -6860,6 +6862,23 @@ Attributes considered include @code{allo
+ This is the default. You can disable these warnings with either
+ @option{-Wno-attribute-alias} or @option{-Wattribute-alias=0}.
+
++@item -Wbidi-chars=@r{[}none@r{|}unpaired@r{|}any@r{]}
++@opindex Wbidi-chars=
++@opindex Wbidi-chars
++@opindex Wno-bidi-chars
++Warn about possibly misleading UTF-8 bidirectional control characters in
++comments, string literals, character constants, and identifiers. Such
++characters can change left-to-right writing direction into right-to-left
++(and vice versa), which can cause confusion between the logical order and
++visual order. This may be dangerous; for instance, it may seem that a piece
++of code is not commented out, whereas it in fact is.
++
++There are three levels of warning supported by GCC@. The default is
++@option{-Wbidi-chars=unpaired}, which warns about improperly terminated
++bidi contexts. @option{-Wbidi-chars=none} turns the warning off.
++@option{-Wbidi-chars=any} warns about any use of bidirectional control
++characters.
++
+ @item -Wbool-compare
+ @opindex Wno-bool-compare
+ @opindex Wbool-compare
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-10.c b/gcc/testsuite/c-c++-common/Wbidi-chars-10.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-10.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-10.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,27 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* More nesting testing. */
++
++/* RLE LRI PDF PDI*/
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int LRE_\u202a_PDF_\u202c;
++int LRE_\u202a_PDF_\u202c_LRE_\u202a_PDF_\u202c;
++int LRE_\u202a_LRI_\u2066_PDF_\u202c_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLE_\u202b_RLI_\u2067_PDF_\u202c_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLE_\u202b_RLI_\u2067_PDI_\u2069_PDF_\u202c;
++int FSI_\u2068_LRO_\u202d_PDI_\u2069_PDF_\u202c;
++int FSI_\u2068;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int FSI_\u2068_PDI_\u2069;
++int FSI_\u2068_FSI_\u2068_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069;
++int RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDF_\u202c;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLI_\u2067_RLI_\u2067_RLI_\u2067_RLI_\u2067_FSI_\u2068_PDI_\u2069_PDI_\u2069_PDI_\u2069_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-11.c b/gcc/testsuite/c-c++-common/Wbidi-chars-11.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-11.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-11.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,13 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test that we warn when mixing UCN and UTF-8. */
++
++int LRE__PDF_\u202c;
++/* { dg-warning "mismatch" "" { target *-*-* } .-1 } */
++int LRE_\u202a_PDF__;
++/* { dg-warning "mismatch" "" { target *-*-* } .-1 } */
++const char *s1 = "LRE__PDF_\u202c";
++/* { dg-warning "mismatch" "" { target *-*-* } .-1 } */
++const char *s2 = "LRE_\u202a_PDF_";
++/* { dg-warning "mismatch" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-12.c b/gcc/testsuite/c-c++-common/Wbidi-chars-12.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-12.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-12.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,19 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile { target { c || c++11 } } } */
++/* { dg-options "-Wbidi-chars=any" } */
++/* Test raw strings. */
++
++const char *s1 = R"(a b c LRE 1 2 3 PDF x y z)";
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++const char *s2 = R"(a b c RLE 1 2 3 PDF x y z)";
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++const char *s3 = R"(a b c LRO 1 2 3 PDF x y z)";
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++const char *s4 = R"(a b c RLO 1 2 3 PDF x y z)";
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++const char *s7 = R"(a b c FSI 1 2 3 PDI x y) z";
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++const char *s8 = R"(a b c PDI x y )z";
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-1 } */
++const char *s9 = R"(a b c PDF x y z)";
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-13.c b/gcc/testsuite/c-c++-common/Wbidi-chars-13.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-13.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-13.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,17 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile { target { c || c++11 } } } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test raw strings. */
++
++const char *s1 = R"(a b c LRE 1 2 3)";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++const char *s2 = R"(a b c RLE 1 2 3)";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++const char *s3 = R"(a b c LRO 1 2 3)";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++const char *s4 = R"(a b c FSI 1 2 3)";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++const char *s5 = R"(a b c LRI 1 2 3)";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++const char *s6 = R"(a b c RLI 1 2 3)";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-14.c b/gcc/testsuite/c-c++-common/Wbidi-chars-14.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-14.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-14.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,38 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test PDI handling, which also pops any subsequent LREs, RLEs, LROs,
++ or RLOs. */
++
++/* LRI__LRI__RLE__RLE__RLE__PDI_*/
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// LRI__RLE__RLE__RLE__PDI_
++// LRI__RLO__RLE__RLE__PDI_
++// LRI__RLO__RLE__PDI_
++// FSI__RLO__PDI_
++// FSI__FSI__RLO__PDI_
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++int LRI_\u2066_LRI_\u2066_LRE_\u202a_LRE_\u202a_LRE_\u202a_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int LRI_\u2066_LRI_\u2066_LRE_\u202a_LRE_\u202a_LRE_\u202a_PDI_\u2069_PDI_\u2069;
++int LRI_\u2066_LRI_\u2066_LRI_\u2066_LRE_\u202a_LRE_\u202a_LRE_\u202a_PDI_\u2069_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int PDI_\u2069;
++int LRI_\u2066_PDI_\u2069;
++int RLI_\u2067_PDI_\u2069;
++int LRE_\u202a_LRI_\u2066_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int LRI_\u2066_LRE_\u202a_PDF_\u202c_PDI_\u2069;
++int LRI_\u2066_LRE_\u202a_LRE_\u202a_PDF_\u202c_PDI_\u2069;
++int RLI_\u2067_LRI_\u2066_LRE_\u202a_LRE_\u202a_PDF_\u202c_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int FSI_\u2068_LRI_\u2066_LRE_\u202a_LRE_\u202a_PDF_\u202c_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLO_\u202e_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int RLI_\u2067_PDI_\u2069_RLI_\u2067;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int FSI_\u2068_PDF_\u202c_PDI_\u2069;
++int FSI_\u2068_FSI_\u2068_PDF_\u202c_PDI_\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-15.c b/gcc/testsuite/c-c++-common/Wbidi-chars-15.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-15.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-15.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,59 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test unpaired bidi control chars in multiline comments. */
++
++/*
++ * LRE end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/*
++ * RLE end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/*
++ * LRO end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/*
++ * RLO end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/*
++ * LRI end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/*
++ * RLI end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/*
++ * FSI end
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/* LRE
++ PDF */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++/* FSI
++ PDI */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++
++/* LRE<>
++ *
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-3 } */
++
++/*
++ * LRE<>
++ */
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++
++/*
++ *
++ * LRE<> */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++/* RLI<> */ /* PDI<> */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* LRE<> */ /* PDF<> */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-16.c b/gcc/testsuite/c-c++-common/Wbidi-chars-16.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-16.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-16.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,26 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=any" } */
++/* Test LTR/RTL chars. */
++
++/* LTR<> */
++/* { dg-warning "U\\+200E" "" { target *-*-* } .-1 } */
++// LTR<>
++/* { dg-warning "U\\+200E" "" { target *-*-* } .-1 } */
++/* RTL<> */
++/* { dg-warning "U\\+200F" "" { target *-*-* } .-1 } */
++// RTL<>
++/* { dg-warning "U\\+200F" "" { target *-*-* } .-1 } */
++
++const char *s1 = "LTR<>";
++/* { dg-warning "U\\+200E" "" { target *-*-* } .-1 } */
++const char *s2 = "LTR\u200e";
++/* { dg-warning "U\\+200E" "" { target *-*-* } .-1 } */
++const char *s3 = "LTR\u200E";
++/* { dg-warning "U\\+200E" "" { target *-*-* } .-1 } */
++const char *s4 = "RTL<>";
++/* { dg-warning "U\\+200F" "" { target *-*-* } .-1 } */
++const char *s5 = "RTL\u200f";
++/* { dg-warning "U\\+200F" "" { target *-*-* } .-1 } */
++const char *s6 = "RTL\u200F";
++/* { dg-warning "U\\+200F" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-17.c b/gcc/testsuite/c-c++-common/Wbidi-chars-17.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-17.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-17.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,30 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test LTR/RTL chars. */
++
++/* LTR<> */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// LTR<>
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* RTL<> */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// RTL<>
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int ltr_\u200e;
++/* { dg-error "universal character " "" { target *-*-* } .-1 } */
++int rtl_\u200f;
++/* { dg-error "universal character " "" { target *-*-* } .-1 } */
++
++const char *s1 = "LTR<>";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++const char *s2 = "LTR\u200e";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++const char *s3 = "LTR\u200E";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++const char *s4 = "RTL<>";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++const char *s5 = "RTL\u200f";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++const char *s6 = "RTL\u200F";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-1.c b/gcc/testsuite/c-c++-common/Wbidi-chars-1.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-1.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-1.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,12 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++
++int main() {
++ int isAdmin = 0;
++ /* } if (isAdmin) begin admins only */
++/* { dg-warning "bidirectional" "" { target *-*-* } .-1 } */
++ __builtin_printf("You are an admin.\n");
++ /* end admins only { */
++/* { dg-warning "bidirectional" "" { target *-*-* } .-1 } */
++ return 0;
++}
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-2.c b/gcc/testsuite/c-c++-common/Wbidi-chars-2.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-2.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-2.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,9 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++
++int main() {
++ /* Say hello; newline/*/ return 0 ;
++/* { dg-warning "bidirectional" "" { target *-*-* } .-1 } */
++ __builtin_printf("Hello world.\n");
++ return 0;
++}
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-3.c b/gcc/testsuite/c-c++-common/Wbidi-chars-3.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-3.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-3.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,11 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++
++int main() {
++ const char* access_level = "user";
++ if (__builtin_strcmp(access_level, "user // Check if admin ")) {
++/* { dg-warning "bidirectional" "" { target *-*-* } .-1 } */
++ __builtin_printf("You are an admin.\n");
++ }
++ return 0;
++}
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-4.c b/gcc/testsuite/c-c++-common/Wbidi-chars-4.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-4.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-4.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,188 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=any -Wno-multichar -Wno-overflow" } */
++/* Test all bidi chars in various contexts (identifiers, comments,
++ string literals, character constants), both UCN and UTF-8. The bidi
++ chars here are properly terminated, except for the character constants. */
++
++/* a b c LRE 1 2 3 PDF x y z */
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++/* a b c RLE 1 2 3 PDF x y z */
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++/* a b c LRO 1 2 3 PDF x y z */
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++/* a b c RLO 1 2 3 PDF x y z */
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++/* a b c LRI 1 2 3 PDI x y z */
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++/* a b c RLI 1 2 3 PDI x y */
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++/* a b c FSI 1 2 3 PDI x y z */
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++
++/* Same but C++ comments instead. */
++// a b c LRE 1 2 3 PDF x y z
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++// a b c RLE 1 2 3 PDF x y z
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++// a b c LRO 1 2 3 PDF x y z
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++// a b c RLO 1 2 3 PDF x y z
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++// a b c LRI 1 2 3 PDI x y z
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++// a b c RLI 1 2 3 PDI x y
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++// a b c FSI 1 2 3 PDI x y z
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++
++/* Here we're closing an unopened context, warn when =any. */
++/* a b c PDI x y z */
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-1 } */
++/* a b c PDF x y z */
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++// a b c PDI x y z
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-1 } */
++// a b c PDF x y z
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++
++/* Multiline comments. */
++/* a b c PDI x y z
++ */
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-2 } */
++/* a b c PDF x y z
++ */
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-2 } */
++/* first
++ a b c PDI x y z
++ */
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-2 } */
++/* first
++ a b c PDF x y z
++ */
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-2 } */
++/* first
++ a b c PDI x y z */
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-1 } */
++/* first
++ a b c PDF x y z */
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++
++void
++g1 ()
++{
++ const char *s1 = "a b c LRE 1 2 3 PDF x y z";
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++ const char *s2 = "a b c RLE 1 2 3 PDF x y z";
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++ const char *s3 = "a b c LRO 1 2 3 PDF x y z";
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++ const char *s4 = "a b c RLO 1 2 3 PDF x y z";
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++ const char *s5 = "a b c LRI 1 2 3 PDI x y z";
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++ const char *s6 = "a b c RLI 1 2 3 PDI x y z";
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++ const char *s7 = "a b c FSI 1 2 3 PDI x y z";
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++ const char *s8 = "a b c PDI x y z";
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-1 } */
++ const char *s9 = "a b c PDF x y z";
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++
++ const char *s10 = "a b c LRE\u202a 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++ const char *s11 = "a b c LRE\u202A 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++ const char *s12 = "a b c RLE\u202b 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++ const char *s13 = "a b c RLE\u202B 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++ const char *s14 = "a b c LRO\u202d 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++ const char *s15 = "a b c LRO\u202D 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++ const char *s16 = "a b c RLO\u202e 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++ const char *s17 = "a b c RLO\u202E 1 2 3 PDF\u202c x y z";
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++ const char *s18 = "a b c LRI\u2066 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++ const char *s19 = "a b c RLI\u2067 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++ const char *s20 = "a b c FSI\u2068 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++}
++
++void
++g2 ()
++{
++ const char c1 = '\u202a';
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++ const char c2 = '\u202A';
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++ const char c3 = '\u202b';
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++ const char c4 = '\u202B';
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++ const char c5 = '\u202d';
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++ const char c6 = '\u202D';
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++ const char c7 = '\u202e';
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++ const char c8 = '\u202E';
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++ const char c9 = '\u2066';
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++ const char c10 = '\u2067';
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++ const char c11 = '\u2068';
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++}
++
++int abc;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++int AX;
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++int A\u202cY;
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++int A\u202CY2;
++/* { dg-warning "U\\+202C" "" { target *-*-* } .-1 } */
++
++int d\u202ae\u202cf;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++int d\u202Ae\u202cf2;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++int d\u202be\u202cf;
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++int d\u202Be\u202cf2;
++/* { dg-warning "U\\+202B" "" { target *-*-* } .-1 } */
++int d\u202de\u202cf;
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++int d\u202De\u202cf2;
++/* { dg-warning "U\\+202D" "" { target *-*-* } .-1 } */
++int d\u202ee\u202cf;
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++int d\u202Ee\u202cf2;
++/* { dg-warning "U\\+202E" "" { target *-*-* } .-1 } */
++int d\u2066e\u2069f;
++/* { dg-warning "U\\+2066" "" { target *-*-* } .-1 } */
++int d\u2067e\u2069f;
++/* { dg-warning "U\\+2067" "" { target *-*-* } .-1 } */
++int d\u2068e\u2069f;
++/* { dg-warning "U\\+2068" "" { target *-*-* } .-1 } */
++int X\u2069;
++/* { dg-warning "U\\+2069" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-5.c b/gcc/testsuite/c-c++-common/Wbidi-chars-5.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-5.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-5.c 2021-12-25 01:36:22.048018559 -0800
+@@ -0,0 +1,188 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired -Wno-multichar -Wno-overflow" } */
++/* Test all bidi chars in various contexts (identifiers, comments,
++ string literals, character constants), both UCN and UTF-8. The bidi
++ chars here are properly terminated, except for the character constants. */
++
++/* a b c LRE 1 2 3 PDF x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c RLE 1 2 3 PDF x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c LRO 1 2 3 PDF x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c RLO 1 2 3 PDF x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c LRI 1 2 3 PDI x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c RLI 1 2 3 PDI x y */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c FSI 1 2 3 PDI x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++
++/* Same but C++ comments instead. */
++// a b c LRE 1 2 3 PDF x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c RLE 1 2 3 PDF x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c LRO 1 2 3 PDF x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c RLO 1 2 3 PDF x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c LRI 1 2 3 PDI x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c RLI 1 2 3 PDI x y
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c FSI 1 2 3 PDI x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++
++/* Here we're closing an unopened context, warn when =any. */
++/* a b c PDI x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* a b c PDF x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c PDI x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++// a b c PDF x y z
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++
++/* Multiline comments. */
++/* a b c PDI x y z
++ */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-2 } */
++/* a b c PDF x y z
++ */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-2 } */
++/* first
++ a b c PDI x y z
++ */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-2 } */
++/* first
++ a b c PDF x y z
++ */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-2 } */
++/* first
++ a b c PDI x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++/* first
++ a b c PDF x y z */
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++
++void
++g1 ()
++{
++ const char *s1 = "a b c LRE 1 2 3 PDF x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s2 = "a b c RLE 1 2 3 PDF x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s3 = "a b c LRO 1 2 3 PDF x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s4 = "a b c RLO 1 2 3 PDF x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s5 = "a b c LRI 1 2 3 PDI x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s6 = "a b c RLI 1 2 3 PDI x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s7 = "a b c FSI 1 2 3 PDI x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s8 = "a b c PDI x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s9 = "a b c PDF x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++
++ const char *s10 = "a b c LRE\u202a 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s11 = "a b c LRE\u202A 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s12 = "a b c RLE\u202b 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s13 = "a b c RLE\u202B 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s14 = "a b c LRO\u202d 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s15 = "a b c LRO\u202D 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s16 = "a b c RLO\u202e 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s17 = "a b c RLO\u202E 1 2 3 PDF\u202c x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s18 = "a b c LRI\u2066 1 2 3 PDI\u2069 x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s19 = "a b c RLI\u2067 1 2 3 PDI\u2069 x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++ const char *s20 = "a b c FSI\u2068 1 2 3 PDI\u2069 x y z";
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++}
++
++void
++g2 ()
++{
++ const char c1 = '\u202a';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c2 = '\u202A';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c3 = '\u202b';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c4 = '\u202B';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c5 = '\u202d';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c6 = '\u202D';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c7 = '\u202e';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c8 = '\u202E';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c9 = '\u2066';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c10 = '\u2067';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char c11 = '\u2068';
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++}
++
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int abc;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int AX;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int A\u202cY;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int A\u202CY2;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++
++int d\u202ae\u202cf;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202Ae\u202cf2;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202be\u202cf;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202Be\u202cf2;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202de\u202cf;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202De\u202cf2;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202ee\u202cf;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u202Ee\u202cf2;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u2066e\u2069f;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u2067e\u2069f;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int d\u2068e\u2069f;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
++int X\u2069;
++/* { dg-bogus "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-6.c b/gcc/testsuite/c-c++-common/Wbidi-chars-6.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-6.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-6.c 2021-12-25 01:36:22.052018489 -0800
+@@ -0,0 +1,155 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test nesting of bidi chars in various contexts. */
++
++/* Terminated by the wrong char: */
++/* a b c LRE 1 2 3 PDI x y z */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* a b c RLE 1 2 3 PDI x y z*/
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* a b c LRO 1 2 3 PDI x y z */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* a b c RLO 1 2 3 PDI x y z */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* a b c LRI 1 2 3 PDF x y z */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* a b c RLI 1 2 3 PDF x y z */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* a b c FSI 1 2 3 PDF x y z*/
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++/* LRE PDF */
++/* LRE LRE PDF PDF */
++/* PDF LRE PDF */
++/* LRE PDF LRE PDF */
++/* LRE LRE PDF */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* PDF LRE */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++// a b c LRE 1 2 3 PDI x y z
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// a b c RLE 1 2 3 PDI x y z*/
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// a b c LRO 1 2 3 PDI x y z
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// a b c RLO 1 2 3 PDI x y z
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// a b c LRI 1 2 3 PDF x y z
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// a b c RLI 1 2 3 PDF x y z
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// a b c FSI 1 2 3 PDF x y z
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++// LRE PDF
++// LRE LRE PDF PDF
++// PDF LRE PDF
++// LRE PDF LRE PDF
++// LRE LRE PDF
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++// PDF LRE
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++void
++g1 ()
++{
++ const char *s1 = "a b c LRE 1 2 3 PDI x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s2 = "a b c LRE\u202a 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s3 = "a b c RLE 1 2 3 PDI x y ";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s4 = "a b c RLE\u202b 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s5 = "a b c LRO 1 2 3 PDI x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s6 = "a b c LRO\u202d 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s7 = "a b c RLO 1 2 3 PDI x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s8 = "a b c RLO\u202e 1 2 3 PDI\u2069 x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s9 = "a b c LRI 1 2 3 PDF x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s10 = "a b c LRI\u2066 1 2 3 PDF\u202c x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s11 = "a b c RLI 1 2 3 PDF x y z\
++ ";
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++ const char *s12 = "a b c RLI\u2067 1 2 3 PDF\u202c x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s13 = "a b c FSI 1 2 3 PDF x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s14 = "a b c FSI\u2068 1 2 3 PDF\u202c x y z";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s15 = "PDF LRE";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s16 = "PDF\u202c LRE\u202a";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s17 = "LRE PDF";
++ const char *s18 = "LRE\u202a PDF\u202c";
++ const char *s19 = "LRE LRE PDF PDF";
++ const char *s20 = "LRE\u202a LRE\u202a PDF\u202c PDF\u202c";
++ const char *s21 = "PDF LRE PDF";
++ const char *s22 = "PDF\u202c LRE\u202a PDF\u202c";
++ const char *s23 = "LRE LRE PDF";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s24 = "LRE\u202a LRE\u202a PDF\u202c";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s25 = "PDF LRE";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s26 = "PDF\u202c LRE\u202a";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s27 = "PDF LRE\u202a";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++ const char *s28 = "PDF\u202c LRE";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++}
++
++int aLREbPDI;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int A\u202aB\u2069C;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aRLEbPDI;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int a\u202bB\u2069c;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aLRObPDI;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int a\u202db\u2069c2;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aRLObPDI;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int a\u202eb\u2069;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aLRIbPDF;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int a\u2066b\u202c;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aRLIbPDFc
++;
++/* { dg-warning "unpaired" "" { target *-*-* } .-2 } */
++int a\u2067b\u202c;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aFSIbPDF;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int a\u2068b\u202c;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aFSIbPD\u202C;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aFSI\u2068bPDF_;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int aLREbPDFb;
++int A\u202aB\u202c;
++int a_LRE_LRE_b_PDF_PDF;
++int A\u202aA\u202aB\u202cB\u202c;
++int aPDFbLREadPDF;
++int a_\u202C_\u202a_\u202c;
++int a_LRE_b_PDF_c_LRE_PDF;
++int a_\u202a_\u202c_\u202a_\u202c_;
++int a_LRE_b_PDF_c_LRE;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int a_\u202a_\u202c_\u202a_;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-7.c b/gcc/testsuite/c-c++-common/Wbidi-chars-7.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-7.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-7.c 2021-12-25 01:36:22.052018489 -0800
+@@ -0,0 +1,9 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=any" } */
++/* Test we ignore UCNs in comments. */
++
++// a b c \u202a 1 2 3
++// a b c \u202A 1 2 3
++/* a b c \u202a 1 2 3 */
++/* a b c \u202A 1 2 3 */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-8.c b/gcc/testsuite/c-c++-common/Wbidi-chars-8.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-8.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-8.c 2021-12-25 01:36:22.052018489 -0800
+@@ -0,0 +1,13 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=any" } */
++/* Test \u vs \U. */
++
++int a_\u202A;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++int a_\u202a_2;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++int a_\U0000202A_3;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
++int a_\U0000202a_4;
++/* { dg-warning "U\\+202A" "" { target *-*-* } .-1 } */
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-9.c b/gcc/testsuite/c-c++-common/Wbidi-chars-9.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-9.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-9.c 2021-12-25 01:36:22.052018489 -0800
+@@ -0,0 +1,29 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired" } */
++/* Test that we properly separate bidi contexts (comment/identifier/character
++ constant/string literal). */
++
++/* LRE -><- */ int pdf_\u202c_1;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* RLE -><- */ int pdf_\u202c_2;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* LRO -><- */ int pdf_\u202c_3;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* RLO -><- */ int pdf_\u202c_4;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* LRI -><-*/ int pdi_\u2069_1;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* RLI -><- */ int pdi_\u2069_12;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* FSI -><- */ int pdi_\u2069_3;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++
++const char *s1 = "LRE\u202a"; /* PDF -><- */
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++/* LRE -><- */ const char *s2 = "PDF\u202c";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++const char *s3 = "LRE\u202a"; int pdf_\u202c_5;
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
++int lre_\u202a; const char *s4 = "PDF\u202c";
++/* { dg-warning "unpaired" "" { target *-*-* } .-1 } */
+diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
+--- a/libcpp/include/cpplib.h 2021-12-25 01:35:33.288883417 -0800
++++ b/libcpp/include/cpplib.h 2021-12-25 01:36:22.052018489 -0800
+@@ -308,6 +308,17 @@ enum cpp_normalize_level {
+ normalized_none
+ };
+
++/* The possible bidirectional control characters checking levels, from least
++ restrictive to most. */
++enum cpp_bidirectional_level {
++ /* No checking. */
++ bidirectional_none,
++ /* Only detect unpaired uses of bidirectional control characters. */
++ bidirectional_unpaired,
++ /* Detect any use of bidirectional control characters. */
++ bidirectional_any
++};
++
+ /* This structure is nested inside struct cpp_reader, and
+ carries all the options visible to the command line. */
+ struct cpp_options
+@@ -515,6 +526,10 @@ struct cpp_options
+ /* True if warn about differences between C++98 and C++11. */
+ bool cpp_warn_cxx11_compat;
+
++ /* Nonzero if bidirectional control characters checking is on. See enum
++ cpp_bidirectional_level. */
++ unsigned char cpp_warn_bidirectional;
++
+ /* Dependency generation. */
+ struct
+ {
+@@ -613,7 +628,8 @@ enum cpp_warning_reason {
+ CPP_W_C90_C99_COMPAT,
+ CPP_W_C11_C2X_COMPAT,
+ CPP_W_CXX11_COMPAT,
+- CPP_W_EXPANSION_TO_DEFINED
++ CPP_W_EXPANSION_TO_DEFINED,
++ CPP_W_BIDIRECTIONAL
+ };
+
+ /* Callback for header lookup for HEADER, which is the name of a
+diff --git a/libcpp/init.c b/libcpp/init.c
+--- a/libcpp/init.c 2021-12-25 01:29:12.931317107 -0800
++++ b/libcpp/init.c 2021-12-25 01:36:22.052018489 -0800
+@@ -215,6 +215,7 @@ cpp_create_reader (enum c_lang lang, cpp
+ = ENABLE_CANONICAL_SYSTEM_HEADERS;
+ CPP_OPTION (pfile, ext_numeric_literals) = 1;
+ CPP_OPTION (pfile, warn_date_time) = 0;
++ CPP_OPTION (pfile, cpp_warn_bidirectional) = bidirectional_unpaired;
+
+ /* Default CPP arithmetic to something sensible for the host for the
+ benefit of dumb users like fix-header. */
+diff --git a/libcpp/internal.h b/libcpp/internal.h
+--- a/libcpp/internal.h 2021-12-25 01:35:33.288883417 -0800
++++ b/libcpp/internal.h 2021-12-25 01:36:22.052018489 -0800
+@@ -581,6 +581,10 @@ struct cpp_reader
+ /* If non-zero, the lexer will use this location for the next token
+ instead of getting a location from the linemap. */
+ location_t forced_token_location;
++ bool warn_bidi_p () const
++ {
++ return CPP_OPTION (this, cpp_warn_bidirectional) != bidirectional_none;
++ }
+ };
+
+ /* Character classes. Based on the more primitive macros in safe-ctype.h.
+diff --git a/libcpp/lex.c b/libcpp/lex.c
+--- a/libcpp/lex.c 2021-12-25 01:35:33.288883417 -0800
++++ b/libcpp/lex.c 2021-12-25 01:36:22.052018489 -0800
+@@ -1164,6 +1164,324 @@ _cpp_process_line_notes (cpp_reader *pfi
+ }
+ }
+
++namespace bidi {
++ enum class kind {
++ NONE, LRE, RLE, LRO, RLO, LRI, RLI, FSI, PDF, PDI, LTR, RTL
++ };
++
++ /* All the UTF-8 encodings of bidi characters start with E2. */
++ constexpr uchar utf8_start = 0xe2;
++
++ /* A vector holding currently open bidi contexts. We use a char for
++ each context, its LSB is 1 if it represents a PDF context, 0 if it
++ represents a PDI context. The next bit is 1 if this context was open
++ by a bidi character written as a UCN, and 0 when it was UTF-8. */
++ semi_embedded_vec <unsigned char, 16> vec;
++
++ /* Close the whole comment/identifier/string literal/character constant
++ context. */
++ void on_close ()
++ {
++ vec.truncate (0);
++ }
++
++ /* Pop the last element in the vector. */
++ void pop ()
++ {
++ unsigned int len = vec.count ();
++ gcc_checking_assert (len > 0);
++ vec.truncate (len - 1);
++ }
++
++ /* Return the context of the Ith element. */
++ kind ctx_at (unsigned int i)
++ {
++ return (vec[i] & 1) ? kind::PDF : kind::PDI;
++ }
++
++ /* Return which context is currently opened. */
++ kind current_ctx ()
++ {
++ unsigned int len = vec.count ();
++ if (len == 0)
++ return kind::NONE;
++ return ctx_at (len - 1);
++ }
++
++ /* Return true if the current context comes from a UCN origin, that is,
++ the bidi char which started this bidi context was written as a UCN. */
++ bool current_ctx_ucn_p ()
++ {
++ unsigned int len = vec.count ();
++ gcc_checking_assert (len > 0);
++ return (vec[len - 1] >> 1) & 1;
++ }
++
++ /* We've read a bidi char, update the current vector as necessary. */
++ void on_char (kind k, bool ucn_p)
++ {
++ switch (k)
++ {
++ case kind::LRE:
++ case kind::RLE:
++ case kind::LRO:
++ case kind::RLO:
++ vec.push (ucn_p ? 3u : 1u);
++ break;
++ case kind::LRI:
++ case kind::RLI:
++ case kind::FSI:
++ vec.push (ucn_p ? 2u : 0u);
++ break;
++ /* PDF terminates the scope of the last LRE, RLE, LRO, or RLO
++ whose scope has not yet been terminated. */
++ case kind::PDF:
++ if (current_ctx () == kind::PDF)
++ pop ();
++ break;
++ /* PDI terminates the scope of the last LRI, RLI, or FSI whose
++ scope has not yet been terminated, as well as the scopes of
++ any subsequent LREs, RLEs, LROs, or RLOs whose scopes have not
++ yet been terminated. */
++ case kind::PDI:
++ for (int i = vec.count () - 1; i >= 0; --i)
++ if (ctx_at (i) == kind::PDI)
++ {
++ vec.truncate (i);
++ break;
++ }
++ break;
++ case kind::LTR:
++ case kind::RTL:
++ /* These aren't popped by a PDF/PDI. */
++ break;
++ [[likely]] case kind::NONE:
++ break;
++ default:
++ abort ();
++ }
++ }
++
++ /* Return a descriptive string for K. */
++ const char *to_str (kind k)
++ {
++ switch (k)
++ {
++ case kind::LRE:
++ return "U+202A (LEFT-TO-RIGHT EMBEDDING)";
++ case kind::RLE:
++ return "U+202B (RIGHT-TO-LEFT EMBEDDING)";
++ case kind::LRO:
++ return "U+202D (LEFT-TO-RIGHT OVERRIDE)";
++ case kind::RLO:
++ return "U+202E (RIGHT-TO-LEFT OVERRIDE)";
++ case kind::LRI:
++ return "U+2066 (LEFT-TO-RIGHT ISOLATE)";
++ case kind::RLI:
++ return "U+2067 (RIGHT-TO-LEFT ISOLATE)";
++ case kind::FSI:
++ return "U+2068 (FIRST STRONG ISOLATE)";
++ case kind::PDF:
++ return "U+202C (POP DIRECTIONAL FORMATTING)";
++ case kind::PDI:
++ return "U+2069 (POP DIRECTIONAL ISOLATE)";
++ case kind::LTR:
++ return "U+200E (LEFT-TO-RIGHT MARK)";
++ case kind::RTL:
++ return "U+200F (RIGHT-TO-LEFT MARK)";
++ default:
++ abort ();
++ }
++ }
++}
++
++/* Parse a sequence of 3 bytes starting with P and return its bidi code. */
++
++static bidi::kind
++get_bidi_utf8 (const unsigned char *const p)
++{
++ gcc_checking_assert (p[0] == bidi::utf8_start);
++
++ if (p[1] == 0x80)
++ switch (p[2])
++ {
++ case 0xaa:
++ return bidi::kind::LRE;
++ case 0xab:
++ return bidi::kind::RLE;
++ case 0xac:
++ return bidi::kind::PDF;
++ case 0xad:
++ return bidi::kind::LRO;
++ case 0xae:
++ return bidi::kind::RLO;
++ case 0x8e:
++ return bidi::kind::LTR;
++ case 0x8f:
++ return bidi::kind::RTL;
++ default:
++ break;
++ }
++ else if (p[1] == 0x81)
++ switch (p[2])
++ {
++ case 0xa6:
++ return bidi::kind::LRI;
++ case 0xa7:
++ return bidi::kind::RLI;
++ case 0xa8:
++ return bidi::kind::FSI;
++ case 0xa9:
++ return bidi::kind::PDI;
++ default:
++ break;
++ }
++
++ return bidi::kind::NONE;
++}
++
++/* Parse a UCN where P points just past \u or \U and return its bidi code. */
++
++static bidi::kind
++get_bidi_ucn (const unsigned char *p, bool is_U)
++{
++ /* 6.4.3 Universal Character Names
++ \u hex-quad
++ \U hex-quad hex-quad
++ where \unnnn means \U0000nnnn. */
++
++ if (is_U)
++ {
++ if (p[0] != '0' || p[1] != '0' || p[2] != '0' || p[3] != '0')
++ return bidi::kind::NONE;
++ /* Skip 4B so we can treat \u and \U the same below. */
++ p += 4;
++ }
++
++ /* All code points we are looking for start with 20xx. */
++ if (p[0] != '2' || p[1] != '0')
++ return bidi::kind::NONE;
++ else if (p[2] == '2')
++ switch (p[3])
++ {
++ case 'a':
++ case 'A':
++ return bidi::kind::LRE;
++ case 'b':
++ case 'B':
++ return bidi::kind::RLE;
++ case 'c':
++ case 'C':
++ return bidi::kind::PDF;
++ case 'd':
++ case 'D':
++ return bidi::kind::LRO;
++ case 'e':
++ case 'E':
++ return bidi::kind::RLO;
++ default:
++ break;
++ }
++ else if (p[2] == '6')
++ switch (p[3])
++ {
++ case '6':
++ return bidi::kind::LRI;
++ case '7':
++ return bidi::kind::RLI;
++ case '8':
++ return bidi::kind::FSI;
++ case '9':
++ return bidi::kind::PDI;
++ default:
++ break;
++ }
++ else if (p[2] == '0')
++ switch (p[3])
++ {
++ case 'e':
++ case 'E':
++ return bidi::kind::LTR;
++ case 'f':
++ case 'F':
++ return bidi::kind::RTL;
++ default:
++ break;
++ }
++
++ return bidi::kind::NONE;
++}
++
++/* We're closing a bidi context, that is, we've encountered a newline,
++ are closing a C-style comment, or are at the end of a string literal,
++ character constant, or identifier. Warn if this context was not
++ properly terminated by a PDI or PDF. P points to the last character
++ in this context. */
++
++static void
++maybe_warn_bidi_on_close (cpp_reader *pfile, const uchar *p)
++{
++ if (CPP_OPTION (pfile, cpp_warn_bidirectional) == bidirectional_unpaired
++ && bidi::vec.count () > 0)
++ {
++ const location_t loc
++ = linemap_position_for_column (pfile->line_table,
++ CPP_BUF_COLUMN (pfile->buffer, p));
++ cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
++ "unpaired UTF-8 bidirectional control character "
++ "detected");
++ }
++ /* We're done with this context. */
++ bidi::on_close ();
++}
++
++/* We're at the beginning or in the middle of an identifier/comment/string
++ literal/character constant. Warn if we've encountered a bidi character.
++ KIND says which bidi character it was; P points to it in the character
++ stream. UCN_P is true iff this bidi character was written as a UCN. */
++
++static void
++maybe_warn_bidi_on_char (cpp_reader *pfile, const uchar *p, bidi::kind kind,
++ bool ucn_p)
++{
++ if (__builtin_expect (kind == bidi::kind::NONE, 1))
++ return;
++
++ const auto warn_bidi = CPP_OPTION (pfile, cpp_warn_bidirectional);
++
++ if (warn_bidi != bidirectional_none)
++ {
++ const location_t loc
++ = linemap_position_for_column (pfile->line_table,
++ CPP_BUF_COLUMN (pfile->buffer, p));
++ /* It seems excessive to warn about a PDI/PDF that is closing
++ an opened context because we've already warned about the
++ opening character. Except warn when we have a UCN x UTF-8
++ mismatch. */
++ if (kind == bidi::current_ctx ())
++ {
++ if (warn_bidi == bidirectional_unpaired
++ && bidi::current_ctx_ucn_p () != ucn_p)
++ cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
++ "UTF-8 vs UCN mismatch when closing "
++ "a context by \"%s\"", bidi::to_str (kind));
++ }
++ else if (warn_bidi == bidirectional_any)
++ {
++ if (kind == bidi::kind::PDF || kind == bidi::kind::PDI)
++ cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
++ "\"%s\" is closing an unopened context",
++ bidi::to_str (kind));
++ else
++ cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
++ "found problematic Unicode character \"%s\"",
++ bidi::to_str (kind));
++ }
++ }
++ /* We're done with this context. */
++ bidi::on_char (kind, ucn_p);
++}
++
+ /* Skip a C-style block comment. We find the end of the comment by
+ seeing if an asterisk is before every '/' we encounter. Returns
+ nonzero if comment terminated by EOF, zero otherwise.
+@@ -1175,6 +1493,7 @@ _cpp_skip_block_comment (cpp_reader *pfi
+ cpp_buffer *buffer = pfile->buffer;
+ const uchar *cur = buffer->cur;
+ uchar c;
++ const bool warn_bidi_p = pfile->warn_bidi_p ();
+
+ cur++;
+ if (*cur == '/')
+@@ -1189,7 +1508,11 @@ _cpp_skip_block_comment (cpp_reader *pfi
+ if (c == '/')
+ {
+ if (cur[-2] == '*')
+- break;
++ {
++ if (warn_bidi_p)
++ maybe_warn_bidi_on_close (pfile, cur);
++ break;
++ }
+
+ /* Warn about potential nested comments, but not if the '/'
+ comes immediately before the true comment delimiter.
+@@ -1208,6 +1531,8 @@ _cpp_skip_block_comment (cpp_reader *pfi
+ {
+ unsigned int cols;
+ buffer->cur = cur - 1;
++ if (warn_bidi_p)
++ maybe_warn_bidi_on_close (pfile, cur);
+ _cpp_process_line_notes (pfile, true);
+ if (buffer->next_line >= buffer->rlimit)
+ return true;
+@@ -1218,6 +1543,13 @@ _cpp_skip_block_comment (cpp_reader *pfi
+
+ cur = buffer->cur;
+ }
++ /* If this is a beginning of a UTF-8 encoding, it might be
++ a bidirectional control character. */
++ else if (__builtin_expect (c == bidi::utf8_start, 0) && warn_bidi_p)
++ {
++ bidi::kind kind = get_bidi_utf8 (cur - 1);
++ maybe_warn_bidi_on_char (pfile, cur, kind, /*ucn_p=*/false);
++ }
+ }
+
+ buffer->cur = cur;
+@@ -1233,9 +1565,31 @@ skip_line_comment (cpp_reader *pfile)
+ {
+ cpp_buffer *buffer = pfile->buffer;
+ location_t orig_line = pfile->line_table->highest_line;
++ const bool warn_bidi_p = pfile->warn_bidi_p ();
+
+- while (*buffer->cur != '\n')
+- buffer->cur++;
++ if (!warn_bidi_p)
++ while (*buffer->cur != '\n')
++ buffer->cur++;
++ else
++ {
++ while (*buffer->cur != '\n'
++ && *buffer->cur != bidi::utf8_start)
++ buffer->cur++;
++ if (__builtin_expect (*buffer->cur == bidi::utf8_start, 0))
++ {
++ while (*buffer->cur != '\n')
++ {
++ if (__builtin_expect (*buffer->cur == bidi::utf8_start, 0))
++ {
++ bidi::kind kind = get_bidi_utf8 (buffer->cur);
++ maybe_warn_bidi_on_char (pfile, buffer->cur, kind,
++ /*ucn_p=*/false);
++ }
++ buffer->cur++;
++ }
++ maybe_warn_bidi_on_close (pfile, buffer->cur);
++ }
++ }
+
+ _cpp_process_line_notes (pfile, true);
+ return orig_line != pfile->line_table->highest_line;
+@@ -1343,11 +1697,13 @@ static const cppchar_t utf8_signifier =
+
+ /* Returns TRUE if the sequence starting at buffer->cur is valid in
+ an identifier. FIRST is TRUE if this starts an identifier. */
++
+ static bool
+ forms_identifier_p (cpp_reader *pfile, int first,
+ struct normalize_state *state)
+ {
+ cpp_buffer *buffer = pfile->buffer;
++ const bool warn_bidi_p = pfile->warn_bidi_p ();
+
+ if (*buffer->cur == '$')
+ {
+@@ -1370,6 +1726,13 @@ forms_identifier_p (cpp_reader *pfile, i
+ cppchar_t s;
+ if (*buffer->cur >= utf8_signifier)
+ {
++ if (__builtin_expect (*buffer->cur == bidi::utf8_start, 0)
++ && warn_bidi_p)
++ {
++ bidi::kind kind = get_bidi_utf8 (buffer->cur);
++ maybe_warn_bidi_on_char (pfile, buffer->cur, kind,
++ /*ucn_p=*/false);
++ }
+ if (_cpp_valid_utf8 (pfile, &buffer->cur, buffer->rlimit, 1 + !first,
+ state, &s))
+ return true;
+@@ -1378,6 +1741,13 @@ forms_identifier_p (cpp_reader *pfile, i
+ && (buffer->cur[1] == 'u' || buffer->cur[1] == 'U'))
+ {
+ buffer->cur += 2;
++ if (warn_bidi_p)
++ {
++ bidi::kind kind = get_bidi_ucn (buffer->cur,
++ buffer->cur[-1] == 'U');
++ maybe_warn_bidi_on_char (pfile, buffer->cur, kind,
++ /*ucn_p=*/true);
++ }
+ if (_cpp_valid_ucn (pfile, &buffer->cur, buffer->rlimit, 1 + !first,
+ state, &s, NULL, NULL))
+ return true;
+@@ -1486,6 +1856,7 @@ lex_identifier (cpp_reader *pfile, const
+ const uchar *cur;
+ unsigned int len;
+ unsigned int hash = HT_HASHSTEP (0, *base);
++ const bool warn_bidi_p = pfile->warn_bidi_p ();
+
+ cur = pfile->buffer->cur;
+ if (! starts_ucn)
+@@ -1509,6 +1880,8 @@ lex_identifier (cpp_reader *pfile, const
+ pfile->buffer->cur++;
+ }
+ } while (forms_identifier_p (pfile, false, nst));
++ if (warn_bidi_p)
++ maybe_warn_bidi_on_close (pfile, pfile->buffer->cur);
+ result = _cpp_interpret_identifier (pfile, base,
+ pfile->buffer->cur - base);
+ *spelling = cpp_lookup (pfile, base, pfile->buffer->cur - base);
+@@ -1697,6 +2070,7 @@ lex_raw_string (cpp_reader *pfile, cpp_t
+ {
+ uchar raw_prefix[17];
+ uchar temp_buffer[18];
++ const bool warn_bidi_p = pfile->warn_bidi_p ();
+ const uchar *orig_base;
+ unsigned int raw_prefix_len = 0, raw_suffix_len = 0;
+ enum raw_str_phase { RAW_STR_PREFIX, RAW_STR, RAW_STR_SUFFIX };
+@@ -1946,8 +2320,15 @@ lex_raw_string (cpp_reader *pfile, cpp_t
+ cur = base = pfile->buffer->cur;
+ note = &pfile->buffer->notes[pfile->buffer->cur_note];
+ }
++ else if (__builtin_expect ((unsigned char) c == bidi::utf8_start, 0)
++ && warn_bidi_p)
++ maybe_warn_bidi_on_char (pfile, pos - 1, get_bidi_utf8 (pos - 1),
++ /*ucn_p=*/false);
+ }
+
++ if (warn_bidi_p)
++ maybe_warn_bidi_on_close (pfile, pos);
++
+ if (CPP_OPTION (pfile, user_literals))
+ {
+ /* If a string format macro, say from inttypes.h, is placed touching
+@@ -2042,15 +2423,27 @@ lex_string (cpp_reader *pfile, cpp_token
+ else
+ terminator = '>', type = CPP_HEADER_NAME;
+
++ const bool warn_bidi_p = pfile->warn_bidi_p ();
+ for (;;)
+ {
+ cppchar_t c = *cur++;
+
+ /* In #include-style directives, terminators are not escapable. */
+ if (c == '\\' && !pfile->state.angled_headers && *cur != '\n')
+- cur++;
++ {
++ if ((cur[0] == 'u' || cur[0] == 'U') && warn_bidi_p)
++ {
++ bidi::kind kind = get_bidi_ucn (cur + 1, cur[0] == 'U');
++ maybe_warn_bidi_on_char (pfile, cur, kind, /*ucn_p=*/true);
++ }
++ cur++;
++ }
+ else if (c == terminator)
+- break;
++ {
++ if (warn_bidi_p)
++ maybe_warn_bidi_on_close (pfile, cur - 1);
++ break;
++ }
+ else if (c == '\n')
+ {
+ cur--;
+@@ -2067,6 +2460,11 @@ lex_string (cpp_reader *pfile, cpp_token
+ }
+ else if (c == '\0')
+ saw_NUL = true;
++ else if (__builtin_expect (c == bidi::utf8_start, 0) && warn_bidi_p)
++ {
++ bidi::kind kind = get_bidi_utf8 (cur - 1);
++ maybe_warn_bidi_on_char (pfile, cur - 1, kind, /*ucn_p=*/false);
++ }
+ }
+
+ if (saw_NUL && !pfile->state.skipping)
diff --git a/meta/recipes-devtools/gcc/gcc/0004-CVE-2021-42574.patch b/meta/recipes-devtools/gcc/gcc/0004-CVE-2021-42574.patch
new file mode 100644
index 0000000000..877b8a6452
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0004-CVE-2021-42574.patch
@@ -0,0 +1,138 @@
+From 1a7f2c0774129750fdf73e9f1b78f0ce983c9ab3 Mon Sep 17 00:00:00 2001
+From: David Malcolm <dmalcolm@redhat.com>
+Date: Tue, 2 Nov 2021 09:54:32 -0400
+Subject: [PATCH] libcpp: escape non-ASCII source bytes in -Wbidi-chars=
+ [PR103026]
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf8
+Content-Transfer-Encoding: 8bit
+
+This flags rich_locations associated with -Wbidi-chars= so that
+non-ASCII bytes will be escaped when printing the source lines
+(using the diagnostics support I added in
+r12-4825-gbd5e882cf6e0def3dd1bc106075d59a303fe0d1e).
+
+In particular, this ensures that the printed source lines will
+be pure ASCII, and thus the visual ordering of the characters
+will be the same as the logical ordering.
+
+Before:
+
+ Wbidi-chars-1.c: In function âmainâ:
+ Wbidi-chars-1.c:6:43: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
+ 6 | /*â® } â¦if (isAdmin)⩠⦠begin admins only */
+ | ^
+ Wbidi-chars-1.c:9:28: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
+ 9 | /* end admins only â® { â¦*/
+ | ^
+
+ Wbidi-chars-11.c:6:15: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 6 | int LRE_âª_PDF_\u202c;
+ | ^
+ Wbidi-chars-11.c:8:19: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 8 | int LRE_\u202a_PDF_â¬_;
+ | ^
+ Wbidi-chars-11.c:10:28: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 10 | const char *s1 = "LRE_âª_PDF_\u202c";
+ | ^
+ Wbidi-chars-11.c:12:33: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 12 | const char *s2 = "LRE_\u202a_PDF_â¬";
+ | ^
+
+After:
+
+ Wbidi-chars-1.c: In function âmainâ:
+ Wbidi-chars-1.c:6:43: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
+ 6 | /*<U+202E> } <U+2066>if (isAdmin)<U+2069> <U+2066> begin admins only */
+ | ^
+ Wbidi-chars-1.c:9:28: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
+ 9 | /* end admins only <U+202E> { <U+2066>*/
+ | ^
+
+ Wbidi-chars-11.c:6:15: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 6 | int LRE_<U+202A>_PDF_\u202c;
+ | ^
+ Wbidi-chars-11.c:8:19: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 8 | int LRE_\u202a_PDF_<U+202C>_;
+ | ^
+ Wbidi-chars-11.c:10:28: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 10 | const char *s1 = "LRE_<U+202A>_PDF_\u202c";
+ | ^
+ Wbidi-chars-11.c:12:33: warning: UTF-8 vs UCN mismatch when closing a context by "U+202C (POP DIRECTIONAL FORMATTING)" [-Wbidi-chars=]
+ 12 | const char *s2 = "LRE_\u202a_PDF_<U+202C>";
+ | ^
+
+libcpp/ChangeLog:
+ PR preprocessor/103026
+ * lex.c (maybe_warn_bidi_on_close): Use a rich_location
+ and call set_escape_on_output (true) on it.
+ (maybe_warn_bidi_on_char): Likewise.
+
+Signed-off-by: David Malcolm <dmalcolm@redhat.com>
+
+CVE: CVE-2021-42574
+Upstream-Status: Backport [https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=1a7f2c0774129750fdf73e9f1b78f0ce983c9ab3]
+Signed-off-by: Pgowda <pgowda.cve@gmail.com>
+
+---
+ libcpp/lex.c | 29 +++++++++++++++++------------
+ 1 file changed, 17 insertions(+), 12 deletions(-)
+
+diff --git a/libcpp/lex.c b/libcpp/lex.c
+--- a/libcpp/lex.c 2021-12-14 20:44:11.647815287 -0800
++++ b/libcpp/lex.c 2021-12-14 20:43:38.008383220 -0800
+@@ -1427,9 +1427,11 @@ maybe_warn_bidi_on_close (cpp_reader *pf
+ const location_t loc
+ = linemap_position_for_column (pfile->line_table,
+ CPP_BUF_COLUMN (pfile->buffer, p));
+- cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
+- "unpaired UTF-8 bidirectional control character "
+- "detected");
++ rich_location rich_loc (pfile->line_table, loc);
++ rich_loc.set_escape_on_output (true);
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "unpaired UTF-8 bidirectional control character "
++ "detected");
+ }
+ /* We're done with this context. */
+ bidi::on_close ();
+@@ -1454,6 +1456,9 @@ maybe_warn_bidi_on_char (cpp_reader *pfi
+ const location_t loc
+ = linemap_position_for_column (pfile->line_table,
+ CPP_BUF_COLUMN (pfile->buffer, p));
++ rich_location rich_loc (pfile->line_table, loc);
++ rich_loc.set_escape_on_output (true);
++
+ /* It seems excessive to warn about a PDI/PDF that is closing
+ an opened context because we've already warned about the
+ opening character. Except warn when we have a UCN x UTF-8
+@@ -1462,20 +1467,20 @@ maybe_warn_bidi_on_char (cpp_reader *pfi
+ {
+ if (warn_bidi == bidirectional_unpaired
+ && bidi::current_ctx_ucn_p () != ucn_p)
+- cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
+- "UTF-8 vs UCN mismatch when closing "
+- "a context by \"%s\"", bidi::to_str (kind));
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "UTF-8 vs UCN mismatch when closing "
++ "a context by \"%s\"", bidi::to_str (kind));
+ }
+ else if (warn_bidi == bidirectional_any)
+ {
+ if (kind == bidi::kind::PDF || kind == bidi::kind::PDI)
+- cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
+- "\"%s\" is closing an unopened context",
+- bidi::to_str (kind));
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "\"%s\" is closing an unopened context",
++ bidi::to_str (kind));
+ else
+- cpp_warning_with_line (pfile, CPP_W_BIDIRECTIONAL, loc, 0,
+- "found problematic Unicode character \"%s\"",
+- bidi::to_str (kind));
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "found problematic Unicode character \"%s\"",
++ bidi::to_str (kind));
+ }
+ }
+ /* We're done with this context. */
diff --git a/meta/recipes-devtools/gcc/gcc/0005-CVE-2021-42574.patch b/meta/recipes-devtools/gcc/gcc/0005-CVE-2021-42574.patch
new file mode 100644
index 0000000000..6e983a67b6
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0005-CVE-2021-42574.patch
@@ -0,0 +1,575 @@
+From bef32d4a28595e933f24fef378cf052a30b674a7 Mon Sep 17 00:00:00 2001
+From: David Malcolm <dmalcolm@redhat.com>
+Date: Tue, 2 Nov 2021 15:45:22 -0400
+Subject: [PATCH] libcpp: capture and underline ranges in -Wbidi-chars=
+ [PR103026]
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf8
+Content-Transfer-Encoding: 8bit
+
+This patch converts the bidi::vec to use a struct so that we can
+capture location_t values for the bidirectional control characters.
+
+Before:
+
+ Wbidi-chars-1.c: In function âmainâ:
+ Wbidi-chars-1.c:6:43: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
+ 6 | /*<U+202E> } <U+2066>if (isAdmin)<U+2069> <U+2066> begin admins only */
+ | ^
+ Wbidi-chars-1.c:9:28: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
+ 9 | /* end admins only <U+202E> { <U+2066>*/
+ | ^
+
+After:
+
+ Wbidi-chars-1.c: In function âmainâ:
+ Wbidi-chars-1.c:6:43: warning: unpaired UTF-8 bidirectional control characters detected [-Wbidi-chars=]
+ 6 | /*<U+202E> } <U+2066>if (isAdmin)<U+2069> <U+2066> begin admins only */
+ | ~~~~~~~~ ~~~~~~~~ ^
+ | | | |
+ | | | end of bidirectional context
+ | U+202E (RIGHT-TO-LEFT OVERRIDE) U+2066 (LEFT-TO-RIGHT ISOLATE)
+ Wbidi-chars-1.c:9:28: warning: unpaired UTF-8 bidirectional control characters detected [-Wbidi-chars=]
+ 9 | /* end admins only <U+202E> { <U+2066>*/
+ | ~~~~~~~~ ~~~~~~~~ ^
+ | | | |
+ | | | end of bidirectional context
+ | | U+2066 (LEFT-TO-RIGHT ISOLATE)
+ | U+202E (RIGHT-TO-LEFT OVERRIDE)
+
+Signed-off-by: David Malcolm <dmalcolm@redhat.com>
+
+gcc/testsuite/ChangeLog:
+ PR preprocessor/103026
+ * c-c++-common/Wbidi-chars-ranges.c: New test.
+
+libcpp/ChangeLog:
+ PR preprocessor/103026
+ * lex.c (struct bidi::context): New.
+ (bidi::vec): Convert to a vec of context rather than unsigned
+ char.
+ (bidi::ctx_at): Rename to...
+ (bidi::pop_kind_at): ...this and reimplement for above change.
+ (bidi::current_ctx): Update for change to vec.
+ (bidi::current_ctx_ucn_p): Likewise.
+ (bidi::current_ctx_loc): New.
+ (bidi::on_char): Update for usage of context struct. Add "loc"
+ param and pass it when pushing contexts.
+ (get_location_for_byte_range_in_cur_line): New.
+ (get_bidi_utf8): Rename to...
+ (get_bidi_utf8_1): ...this, reintroducing...
+ (get_bidi_utf8): ...as a wrapper, setting *OUT when the result is
+ not NONE.
+ (get_bidi_ucn): Rename to...
+ (get_bidi_ucn_1): ...this, reintroducing...
+ (get_bidi_ucn): ...as a wrapper, setting *OUT when the result is
+ not NONE.
+ (class unpaired_bidi_rich_location): New.
+ (maybe_warn_bidi_on_close): Use unpaired_bidi_rich_location when
+ reporting on unpaired bidi chars. Split into singular vs plural
+ spellings.
+ (maybe_warn_bidi_on_char): Pass in a location_t rather than a
+ const uchar * and use it when emitting warnings, and when calling
+ bidi::on_char.
+ (_cpp_skip_block_comment): Capture location when kind is not NONE
+ and pass it to maybe_warn_bidi_on_char.
+ (skip_line_comment): Likewise.
+ (forms_identifier_p): Likewise.
+ (lex_raw_string): Likewise.
+ (lex_string): Likewise.
+
+Signed-off-by: David Malcolm <dmalcolm@redhat.com>
+
+CVE: CVE-2021-42574
+Upstream-Status: Backport [https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=bef32d4a28595e933f24fef378cf052a30b674a7]
+Signed-off-by: Pgowda <pgowda.cve@gmail.com>
+
+---
+ .../c-c++-common/Wbidi-chars-ranges.c | 54 ++++
+ libcpp/lex.c | 251 ++++++++++++++----
+ 2 files changed, 257 insertions(+), 48 deletions(-)
+ create mode 100644 gcc/testsuite/c-c++-common/Wbidi-chars-ranges.c
+
+diff --git a/gcc/testsuite/c-c++-common/Wbidi-chars-ranges.c b/gcc/testsuite/c-c++-common/Wbidi-chars-ranges.c
+--- a/gcc/testsuite/c-c++-common/Wbidi-chars-ranges.c 1969-12-31 16:00:00.000000000 -0800
++++ b/gcc/testsuite/c-c++-common/Wbidi-chars-ranges.c 2021-12-25 01:39:55.116281847 -0800
+@@ -0,0 +1,54 @@
++/* PR preprocessor/103026 */
++/* { dg-do compile } */
++/* { dg-options "-Wbidi-chars=unpaired -fdiagnostics-show-caret" } */
++/* Verify that we escape and underline pertinent bidirectional
++ control characters when quoting the source. */
++
++int test_unpaired_bidi () {
++ int isAdmin = 0;
++ /* } if (isAdmin) begin admins only */
++/* { dg-warning "bidirectional" "" { target *-*-* } .-1 } */
++#if 0
++ { dg-begin-multiline-output "" }
++ /*<U+202E> } <U+2066>if (isAdmin)<U+2069> <U+2066> begin admins only */
++ ~~~~~~~~ ~~~~~~~~ ^
++ | | |
++ | | end of bidirectional context
++ U+202E (RIGHT-TO-LEFT OVERRIDE) U+2066 (LEFT-TO-RIGHT ISOLATE)
++ { dg-end-multiline-output "" }
++#endif
++
++ __builtin_printf("You are an admin.\n");
++ /* end admins only { */
++/* { dg-warning "bidirectional" "" { target *-*-* } .-1 } */
++#if 0
++ { dg-begin-multiline-output "" }
++ /* end admins only <U+202E> { <U+2066>*/
++ ~~~~~~~~ ~~~~~~~~ ^
++ | | |
++ | | end of bidirectional context
++ | U+2066 (LEFT-TO-RIGHT ISOLATE)
++ U+202E (RIGHT-TO-LEFT OVERRIDE)
++ { dg-end-multiline-output "" }
++#endif
++
++ return 0;
++}
++
++int LRE__PDF_\u202c;
++/* { dg-warning "mismatch" "" { target *-*-* } .-1 } */
++#if 0
++ { dg-begin-multiline-output "" }
++ int LRE_<U+202A>_PDF_\u202c;
++ ~~~~~~~~ ^~~~~~
++ { dg-end-multiline-output "" }
++#endif
++
++const char *s1 = "LRE__PDF_\u202c";
++/* { dg-warning "mismatch" "" { target *-*-* } .-1 } */
++#if 0
++ { dg-begin-multiline-output "" }
++ const char *s1 = "LRE_<U+202A>_PDF_\u202c";
++ ~~~~~~~~ ^~~~~~
++ { dg-end-multiline-output "" }
++#endif
+diff --git a/libcpp/lex.c b/libcpp/lex.c
+--- a/libcpp/lex.c 2021-12-25 01:41:16.522868808 -0800
++++ b/libcpp/lex.c 2021-12-25 06:28:58.530680302 -0800
+@@ -1172,11 +1172,34 @@ namespace bidi {
+ /* All the UTF-8 encodings of bidi characters start with E2. */
+ constexpr uchar utf8_start = 0xe2;
+
++ struct context
++ {
++ context () {}
++ context (location_t loc, kind k, bool pdf, bool ucn)
++ : m_loc (loc), m_kind (k), m_pdf (pdf), m_ucn (ucn)
++ {
++ }
++
++ kind get_pop_kind () const
++ {
++ return m_pdf ? kind::PDF : kind::PDI;
++ }
++ bool ucn_p () const
++ {
++ return m_ucn;
++ }
++
++ location_t m_loc;
++ kind m_kind;
++ unsigned m_pdf : 1;
++ unsigned m_ucn : 1;
++ };
++
+ /* A vector holding currently open bidi contexts. We use a char for
+ each context, its LSB is 1 if it represents a PDF context, 0 if it
+ represents a PDI context. The next bit is 1 if this context was open
+ by a bidi character written as a UCN, and 0 when it was UTF-8. */
+- semi_embedded_vec <unsigned char, 16> vec;
++ semi_embedded_vec <context, 16> vec;
+
+ /* Close the whole comment/identifier/string literal/character constant
+ context. */
+@@ -1193,19 +1216,19 @@ namespace bidi {
+ vec.truncate (len - 1);
+ }
+
+- /* Return the context of the Ith element. */
+- kind ctx_at (unsigned int i)
++ /* Return the pop kind of the context of the Ith element. */
++ kind pop_kind_at (unsigned int i)
+ {
+- return (vec[i] & 1) ? kind::PDF : kind::PDI;
++ return vec[i].get_pop_kind ();
+ }
+
+- /* Return which context is currently opened. */
++ /* Return the pop kind of the context that is currently opened. */
+ kind current_ctx ()
+ {
+ unsigned int len = vec.count ();
+ if (len == 0)
+ return kind::NONE;
+- return ctx_at (len - 1);
++ return vec[len - 1].get_pop_kind ();
+ }
+
+ /* Return true if the current context comes from a UCN origin, that is,
+@@ -1214,11 +1237,19 @@ namespace bidi {
+ {
+ unsigned int len = vec.count ();
+ gcc_checking_assert (len > 0);
+- return (vec[len - 1] >> 1) & 1;
++ return vec[len - 1].m_ucn;
+ }
+
+- /* We've read a bidi char, update the current vector as necessary. */
+- void on_char (kind k, bool ucn_p)
++ location_t current_ctx_loc ()
++ {
++ unsigned int len = vec.count ();
++ gcc_checking_assert (len > 0);
++ return vec[len - 1].m_loc;
++ }
++
++ /* We've read a bidi char, update the current vector as necessary.
++ LOC is only valid when K is not kind::NONE. */
++ void on_char (kind k, bool ucn_p, location_t loc)
+ {
+ switch (k)
+ {
+@@ -1226,12 +1257,12 @@ namespace bidi {
+ case kind::RLE:
+ case kind::LRO:
+ case kind::RLO:
+- vec.push (ucn_p ? 3u : 1u);
++ vec.push (context (loc, k, true, ucn_p));
+ break;
+ case kind::LRI:
+ case kind::RLI:
+ case kind::FSI:
+- vec.push (ucn_p ? 2u : 0u);
++ vec.push (context (loc, k, false, ucn_p));
+ break;
+ /* PDF terminates the scope of the last LRE, RLE, LRO, or RLO
+ whose scope has not yet been terminated. */
+@@ -1245,7 +1276,7 @@ namespace bidi {
+ yet been terminated. */
+ case kind::PDI:
+ for (int i = vec.count () - 1; i >= 0; --i)
+- if (ctx_at (i) == kind::PDI)
++ if (pop_kind_at (i) == kind::PDI)
+ {
+ vec.truncate (i);
+ break;
+@@ -1295,10 +1326,47 @@ namespace bidi {
+ }
+ }
+
++/* Get location_t for the range of bytes [START, START + NUM_BYTES)
++ within the current line in FILE, with the caret at START. */
++
++static location_t
++get_location_for_byte_range_in_cur_line (cpp_reader *pfile,
++ const unsigned char *const start,
++ size_t num_bytes)
++{
++ gcc_checking_assert (num_bytes > 0);
++
++ /* CPP_BUF_COLUMN and linemap_position_for_column both refer
++ to offsets in bytes, but CPP_BUF_COLUMN is 0-based,
++ whereas linemap_position_for_column is 1-based. */
++
++ /* Get 0-based offsets within the line. */
++ size_t start_offset = CPP_BUF_COLUMN (pfile->buffer, start);
++ size_t end_offset = start_offset + num_bytes - 1;
++
++ /* Now convert to location_t, where "columns" are 1-based byte offsets. */
++ location_t start_loc = linemap_position_for_column (pfile->line_table,
++ start_offset + 1);
++ location_t end_loc = linemap_position_for_column (pfile->line_table,
++ end_offset + 1);
++
++ if (start_loc == end_loc)
++ return start_loc;
++
++ source_range src_range;
++ src_range.m_start = start_loc;
++ src_range.m_finish = end_loc;
++ location_t combined_loc = COMBINE_LOCATION_DATA (pfile->line_table,
++ start_loc,
++ src_range,
++ NULL);
++ return combined_loc;
++}
++
+ /* Parse a sequence of 3 bytes starting with P and return its bidi code. */
+
+ static bidi::kind
+-get_bidi_utf8 (const unsigned char *const p)
++get_bidi_utf8_1 (const unsigned char *const p)
+ {
+ gcc_checking_assert (p[0] == bidi::utf8_start);
+
+@@ -1340,10 +1408,25 @@ get_bidi_utf8 (const unsigned char *cons
+ return bidi::kind::NONE;
+ }
+
++/* Parse a sequence of 3 bytes starting with P and return its bidi code.
++ If the kind is not NONE, write the location to *OUT.*/
++
++static bidi::kind
++get_bidi_utf8 (cpp_reader *pfile, const unsigned char *const p, location_t *out)
++{
++ bidi::kind result = get_bidi_utf8_1 (p);
++ if (result != bidi::kind::NONE)
++ {
++ /* We have a sequence of 3 bytes starting at P. */
++ *out = get_location_for_byte_range_in_cur_line (pfile, p, 3);
++ }
++ return result;
++}
++
+ /* Parse a UCN where P points just past \u or \U and return its bidi code. */
+
+ static bidi::kind
+-get_bidi_ucn (const unsigned char *p, bool is_U)
++get_bidi_ucn_1 (const unsigned char *p, bool is_U)
+ {
+ /* 6.4.3 Universal Character Names
+ \u hex-quad
+@@ -1412,6 +1495,62 @@ get_bidi_ucn (const unsigned char *p, bo
+ return bidi::kind::NONE;
+ }
+
++/* Parse a UCN where P points just past \u or \U and return its bidi code.
++ If the kind is not NONE, write the location to *OUT.*/
++
++static bidi::kind
++get_bidi_ucn (cpp_reader *pfile, const unsigned char *p, bool is_U,
++ location_t *out)
++{
++ bidi::kind result = get_bidi_ucn_1 (p, is_U);
++ if (result != bidi::kind::NONE)
++ {
++ const unsigned char *start = p - 2;
++ size_t num_bytes = 2 + (is_U ? 8 : 4);
++ *out = get_location_for_byte_range_in_cur_line (pfile, start, num_bytes);
++ }
++ return result;
++}
++
++/* Subclass of rich_location for reporting on unpaired UTF-8
++ bidirectional control character(s).
++ Escape the source lines on output, and show all unclosed
++ bidi context, labelling everything. */
++
++class unpaired_bidi_rich_location : public rich_location
++{
++ public:
++ class custom_range_label : public range_label
++ {
++ public:
++ label_text get_text (unsigned range_idx) const FINAL OVERRIDE
++ {
++ /* range 0 is the primary location; each subsequent range i + 1
++ is for bidi::vec[i]. */
++ if (range_idx > 0)
++ {
++ const bidi::context &ctxt (bidi::vec[range_idx - 1]);
++ return label_text::borrow (bidi::to_str (ctxt.m_kind));
++ }
++ else
++ return label_text::borrow (_("end of bidirectional context"));
++ }
++ };
++
++ unpaired_bidi_rich_location (cpp_reader *pfile, location_t loc)
++ : rich_location (pfile->line_table, loc, &m_custom_label)
++ {
++ set_escape_on_output (true);
++ for (unsigned i = 0; i < bidi::vec.count (); i++)
++ add_range (bidi::vec[i].m_loc,
++ SHOW_RANGE_WITHOUT_CARET,
++ &m_custom_label);
++ }
++
++ private:
++ custom_range_label m_custom_label;
++};
++
+ /* We're closing a bidi context, that is, we've encountered a newline,
+ are closing a C-style comment, or are at the end of a string literal,
+ character constant, or identifier. Warn if this context was not
+@@ -1427,11 +1566,17 @@ maybe_warn_bidi_on_close (cpp_reader *pf
+ const location_t loc
+ = linemap_position_for_column (pfile->line_table,
+ CPP_BUF_COLUMN (pfile->buffer, p));
+- rich_location rich_loc (pfile->line_table, loc);
+- rich_loc.set_escape_on_output (true);
+- cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
+- "unpaired UTF-8 bidirectional control character "
+- "detected");
++ unpaired_bidi_rich_location rich_loc (pfile, loc);
++ /* cpp_callbacks doesn't yet have a way to handle singular vs plural
++ forms of a diagnostic, so fake it for now. */
++ if (bidi::vec.count () > 1)
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "unpaired UTF-8 bidirectional control characters "
++ "detected");
++ else
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "unpaired UTF-8 bidirectional control character "
++ "detected");
+ }
+ /* We're done with this context. */
+ bidi::on_close ();
+@@ -1439,12 +1584,13 @@ maybe_warn_bidi_on_close (cpp_reader *pf
+
+ /* We're at the beginning or in the middle of an identifier/comment/string
+ literal/character constant. Warn if we've encountered a bidi character.
+- KIND says which bidi character it was; P points to it in the character
+- stream. UCN_P is true iff this bidi character was written as a UCN. */
++ KIND says which bidi control character it was; UCN_P is true iff this bidi
++ control character was written as a UCN. LOC is the location of the
++ character, but is only valid if KIND != bidi::kind::NONE. */
+
+ static void
+-maybe_warn_bidi_on_char (cpp_reader *pfile, const uchar *p, bidi::kind kind,
+- bool ucn_p)
++maybe_warn_bidi_on_char (cpp_reader *pfile, bidi::kind kind,
++ bool ucn_p, location_t loc)
+ {
+ if (__builtin_expect (kind == bidi::kind::NONE, 1))
+ return;
+@@ -1453,9 +1599,6 @@ maybe_warn_bidi_on_char (cpp_reader *pfi
+
+ if (warn_bidi != bidirectional_none)
+ {
+- const location_t loc
+- = linemap_position_for_column (pfile->line_table,
+- CPP_BUF_COLUMN (pfile->buffer, p));
+ rich_location rich_loc (pfile->line_table, loc);
+ rich_loc.set_escape_on_output (true);
+
+@@ -1467,9 +1610,12 @@ maybe_warn_bidi_on_char (cpp_reader *pfi
+ {
+ if (warn_bidi == bidirectional_unpaired
+ && bidi::current_ctx_ucn_p () != ucn_p)
+- cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
+- "UTF-8 vs UCN mismatch when closing "
+- "a context by \"%s\"", bidi::to_str (kind));
++ {
++ rich_loc.add_range (bidi::current_ctx_loc ());
++ cpp_warning_at (pfile, CPP_W_BIDIRECTIONAL, &rich_loc,
++ "UTF-8 vs UCN mismatch when closing "
++ "a context by \"%s\"", bidi::to_str (kind));
++ }
+ }
+ else if (warn_bidi == bidirectional_any)
+ {
+@@ -1484,7 +1630,7 @@ maybe_warn_bidi_on_char (cpp_reader *pfi
+ }
+ }
+ /* We're done with this context. */
+- bidi::on_char (kind, ucn_p);
++ bidi::on_char (kind, ucn_p, loc);
+ }
+
+ /* Skip a C-style block comment. We find the end of the comment by
+@@ -1552,8 +1698,9 @@ _cpp_skip_block_comment (cpp_reader *pfi
+ a bidirectional control character. */
+ else if (__builtin_expect (c == bidi::utf8_start, 0) && warn_bidi_p)
+ {
+- bidi::kind kind = get_bidi_utf8 (cur - 1);
+- maybe_warn_bidi_on_char (pfile, cur, kind, /*ucn_p=*/false);
++ location_t loc;
++ bidi::kind kind = get_bidi_utf8 (pfile, cur - 1, &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/false, loc);
+ }
+ }
+
+@@ -1586,9 +1733,9 @@ skip_line_comment (cpp_reader *pfile)
+ {
+ if (__builtin_expect (*buffer->cur == bidi::utf8_start, 0))
+ {
+- bidi::kind kind = get_bidi_utf8 (buffer->cur);
+- maybe_warn_bidi_on_char (pfile, buffer->cur, kind,
+- /*ucn_p=*/false);
++ location_t loc;
++ bidi::kind kind = get_bidi_utf8 (pfile, buffer->cur, &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/false, loc);
+ }
+ buffer->cur++;
+ }
+@@ -1734,9 +1881,9 @@ forms_identifier_p (cpp_reader *pfile, i
+ if (__builtin_expect (*buffer->cur == bidi::utf8_start, 0)
+ && warn_bidi_p)
+ {
+- bidi::kind kind = get_bidi_utf8 (buffer->cur);
+- maybe_warn_bidi_on_char (pfile, buffer->cur, kind,
+- /*ucn_p=*/false);
++ location_t loc;
++ bidi::kind kind = get_bidi_utf8 (pfile, buffer->cur, &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/false, loc);
+ }
+ if (_cpp_valid_utf8 (pfile, &buffer->cur, buffer->rlimit, 1 + !first,
+ state, &s))
+@@ -1748,10 +1895,12 @@ forms_identifier_p (cpp_reader *pfile, i
+ buffer->cur += 2;
+ if (warn_bidi_p)
+ {
+- bidi::kind kind = get_bidi_ucn (buffer->cur,
+- buffer->cur[-1] == 'U');
+- maybe_warn_bidi_on_char (pfile, buffer->cur, kind,
+- /*ucn_p=*/true);
++ location_t loc;
++ bidi::kind kind = get_bidi_ucn (pfile,
++ buffer->cur,
++ buffer->cur[-1] == 'U',
++ &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/true, loc);
+ }
+ if (_cpp_valid_ucn (pfile, &buffer->cur, buffer->rlimit, 1 + !first,
+ state, &s, NULL, NULL))
+@@ -2327,12 +2476,15 @@ lex_raw_string (cpp_reader *pfile, cpp_t
+ }
+ else if (__builtin_expect ((unsigned char) c == bidi::utf8_start, 0)
+ && warn_bidi_p)
+- maybe_warn_bidi_on_char (pfile, pos - 1, get_bidi_utf8 (pos - 1),
+- /*ucn_p=*/false);
++ {
++ location_t loc;
++ bidi::kind kind = get_bidi_utf8 (pfile, cur - 1, &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/false, loc);
++ }
+ }
+
+ if (warn_bidi_p)
+- maybe_warn_bidi_on_close (pfile, pos);
++ maybe_warn_bidi_on_close (pfile, cur);
+
+ if (CPP_OPTION (pfile, user_literals))
+ {
+@@ -2438,8 +2590,10 @@ lex_string (cpp_reader *pfile, cpp_token
+ {
+ if ((cur[0] == 'u' || cur[0] == 'U') && warn_bidi_p)
+ {
+- bidi::kind kind = get_bidi_ucn (cur + 1, cur[0] == 'U');
+- maybe_warn_bidi_on_char (pfile, cur, kind, /*ucn_p=*/true);
++ location_t loc;
++ bidi::kind kind = get_bidi_ucn (pfile, cur + 1, cur[0] == 'U',
++ &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/true, loc);
+ }
+ cur++;
+ }
+@@ -2467,8 +2621,9 @@ lex_string (cpp_reader *pfile, cpp_token
+ saw_NUL = true;
+ else if (__builtin_expect (c == bidi::utf8_start, 0) && warn_bidi_p)
+ {
+- bidi::kind kind = get_bidi_utf8 (cur - 1);
+- maybe_warn_bidi_on_char (pfile, cur - 1, kind, /*ucn_p=*/false);
++ location_t loc;
++ bidi::kind kind = get_bidi_utf8 (pfile, cur - 1, &loc);
++ maybe_warn_bidi_on_char (pfile, kind, /*ucn_p=*/false, loc);
+ }
+ }
+
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [hardknott][PATCH 6/9] busybox: backport patches to fix CVEs
2022-01-11 14:32 [hardknott][PATCH 0/9] Patch review Anuj Mittal
` (4 preceding siblings ...)
2022-01-11 14:32 ` [hardknott][PATCH 5/9] gcc: Fix CVE-2021-42574 Anuj Mittal
@ 2022-01-11 14:32 ` Anuj Mittal
2022-01-11 14:32 ` [hardknott][PATCH 7/9] glibc: Backport fix for CVE-2021-43396 Anuj Mittal
` (2 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Anuj Mittal @ 2022-01-11 14:32 UTC (permalink / raw)
To: openembedded-core
From: Chen Qi <Qi.Chen@windriver.com>
Backport patches to fix the following CVEs:
CVE-2021-42373
CVE-2021-42378
CVE-2021-42379
CVE-2021-42380
CVE-2021-42381
CVE-2021-42382
CVE-2021-42383
CVE-2021-42384
CVE-2021-42385
CVE-2021-42386
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
---
.../busybox/busybox/0001-awk-fix-CVEs.patch | 3266 +++++++++++++++++
.../0002-man-fix-segfault-in-man-1.patch | 30 +
meta/recipes-core/busybox/busybox_1.33.2.bb | 2 +
3 files changed, 3298 insertions(+)
create mode 100644 meta/recipes-core/busybox/busybox/0001-awk-fix-CVEs.patch
create mode 100644 meta/recipes-core/busybox/busybox/0002-man-fix-segfault-in-man-1.patch
diff --git a/meta/recipes-core/busybox/busybox/0001-awk-fix-CVEs.patch b/meta/recipes-core/busybox/busybox/0001-awk-fix-CVEs.patch
new file mode 100644
index 0000000000..c07b53ebfd
--- /dev/null
+++ b/meta/recipes-core/busybox/busybox/0001-awk-fix-CVEs.patch
@@ -0,0 +1,3266 @@
+From cf542caeed195af05fa6205341f829ccee53f8c2 Mon Sep 17 00:00:00 2001
+From: Chen Qi <Qi.Chen@windriver.com>
+Date: Tue, 4 Jan 2022 17:48:03 -0800
+Subject: [PATCH] awk: fix CVEs
+
+The awk CVEs is hard to be separated, thus we use the following method
+to format the current patch.
+git rev-list --reverse 1_33_2..1_34_1 -- editors/awk.c | xargs git cherry-pick
+git reset HEAD~66 && git add . && git commit
+
+CVE: CVE-2021-42378
+CVE: CVE-2021-42379
+CVE: CVE-2021-42380
+CVE: CVE-2021-42381
+CVE: CVE-2021-42382
+CVE: CVE-2021-42383
+CVE: CVE-2021-42384
+CVE: CVE-2021-42385
+CVE: CVE-2021-42386
+
+Upstream-Status: Backport
+
+Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
+---
+ editors/awk.c | 2060 +++++++++++++++++++++++-----------------
+ testsuite/awk.tests | 62 +-
+ testsuite/printf.tests | 5 +
+ 3 files changed, 1264 insertions(+), 863 deletions(-)
+
+diff --git a/editors/awk.c b/editors/awk.c
+index 2c15f9e4e..f6314ac72 100644
+--- a/editors/awk.c
++++ b/editors/awk.c
+@@ -66,6 +66,8 @@
+ #endif
+ #ifndef debug_printf_parse
+ # define debug_printf_parse(...) (fprintf(stderr, __VA_ARGS__))
++#else
++# define debug_parse_print_tc(...) ((void)0)
+ #endif
+
+
+@@ -91,7 +93,6 @@ enum {
+ };
+
+ #define MAXVARFMT 240
+-#define MINNVBLOCK 64
+
+ /* variable flags */
+ #define VF_NUMBER 0x0001 /* 1 = primary type is number */
+@@ -101,7 +102,7 @@ enum {
+ #define VF_USER 0x0200 /* 1 = user input (may be numeric string) */
+ #define VF_SPECIAL 0x0400 /* 1 = requires extra handling when changed */
+ #define VF_WALK 0x0800 /* 1 = variable has alloc'd x.walker list */
+-#define VF_FSTR 0x1000 /* 1 = var::string points to fstring buffer */
++#define VF_FSTR 0x1000 /* 1 = don't free() var::string (not malloced, or is owned by something else) */
+ #define VF_CHILD 0x2000 /* 1 = function arg; x.parent points to source */
+ #define VF_DIRTY 0x4000 /* 1 = variable was set explicitly */
+
+@@ -118,8 +119,8 @@ typedef struct walker_list {
+ /* Variable */
+ typedef struct var_s {
+ unsigned type; /* flags */
+- double number;
+ char *string;
++ double number;
+ union {
+ int aidx; /* func arg idx (for compilation stage) */
+ struct xhash_s *array; /* array ptr */
+@@ -138,6 +139,7 @@ typedef struct chain_s {
+ /* Function */
+ typedef struct func_s {
+ unsigned nargs;
++ smallint defined;
+ struct chain_s body;
+ } func;
+
+@@ -177,7 +179,7 @@ typedef struct node_s {
+ struct node_s *n;
+ var *v;
+ int aidx;
+- char *new_progname;
++ const char *new_progname;
+ regex_t *re;
+ } l;
+ union {
+@@ -190,91 +192,120 @@ typedef struct node_s {
+ } a;
+ } node;
+
+-/* Block of temporary variables */
+-typedef struct nvblock_s {
+- int size;
+- var *pos;
+- struct nvblock_s *prev;
+- struct nvblock_s *next;
+- var nv[];
+-} nvblock;
+-
+ typedef struct tsplitter_s {
+ node n;
+ regex_t re[2];
+ } tsplitter;
+
+ /* simple token classes */
+-/* Order and hex values are very important!!! See next_token() */
+-#define TC_SEQSTART (1 << 0) /* ( */
+-#define TC_SEQTERM (1 << 1) /* ) */
+-#define TC_REGEXP (1 << 2) /* /.../ */
+-#define TC_OUTRDR (1 << 3) /* | > >> */
+-#define TC_UOPPOST (1 << 4) /* unary postfix operator */
+-#define TC_UOPPRE1 (1 << 5) /* unary prefix operator */
+-#define TC_BINOPX (1 << 6) /* two-opnd operator */
+-#define TC_IN (1 << 7)
+-#define TC_COMMA (1 << 8)
+-#define TC_PIPE (1 << 9) /* input redirection pipe */
+-#define TC_UOPPRE2 (1 << 10) /* unary prefix operator */
+-#define TC_ARRTERM (1 << 11) /* ] */
+-#define TC_GRPSTART (1 << 12) /* { */
+-#define TC_GRPTERM (1 << 13) /* } */
+-#define TC_SEMICOL (1 << 14)
+-#define TC_NEWLINE (1 << 15)
+-#define TC_STATX (1 << 16) /* ctl statement (for, next...) */
+-#define TC_WHILE (1 << 17)
+-#define TC_ELSE (1 << 18)
+-#define TC_BUILTIN (1 << 19)
++/* order and hex values are very important!!! See next_token() */
++#define TC_LPAREN (1 << 0) /* ( */
++#define TC_RPAREN (1 << 1) /* ) */
++#define TC_REGEXP (1 << 2) /* /.../ */
++#define TC_OUTRDR (1 << 3) /* | > >> */
++#define TC_UOPPOST (1 << 4) /* unary postfix operator ++ -- */
++#define TC_UOPPRE1 (1 << 5) /* unary prefix operator ++ -- $ */
++#define TC_BINOPX (1 << 6) /* two-opnd operator */
++#define TC_IN (1 << 7) /* 'in' */
++#define TC_COMMA (1 << 8) /* , */
++#define TC_PIPE (1 << 9) /* input redirection pipe | */
++#define TC_UOPPRE2 (1 << 10) /* unary prefix operator + - ! */
++#define TC_ARRTERM (1 << 11) /* ] */
++#define TC_LBRACE (1 << 12) /* { */
++#define TC_RBRACE (1 << 13) /* } */
++#define TC_SEMICOL (1 << 14) /* ; */
++#define TC_NEWLINE (1 << 15)
++#define TC_STATX (1 << 16) /* ctl statement (for, next...) */
++#define TC_WHILE (1 << 17) /* 'while' */
++#define TC_ELSE (1 << 18) /* 'else' */
++#define TC_BUILTIN (1 << 19)
+ /* This costs ~50 bytes of code.
+ * A separate class to support deprecated "length" form. If we don't need that
+ * (i.e. if we demand that only "length()" with () is valid), then TC_LENGTH
+ * can be merged with TC_BUILTIN:
+ */
+-#define TC_LENGTH (1 << 20)
+-#define TC_GETLINE (1 << 21)
+-#define TC_FUNCDECL (1 << 22) /* 'function' 'func' */
+-#define TC_BEGIN (1 << 23)
+-#define TC_END (1 << 24)
+-#define TC_EOF (1 << 25)
+-#define TC_VARIABLE (1 << 26)
+-#define TC_ARRAY (1 << 27)
+-#define TC_FUNCTION (1 << 28)
+-#define TC_STRING (1 << 29)
+-#define TC_NUMBER (1 << 30)
+-
+-#define TC_UOPPRE (TC_UOPPRE1 | TC_UOPPRE2)
+-
+-/* combined token classes */
+-#define TC_BINOP (TC_BINOPX | TC_COMMA | TC_PIPE | TC_IN)
+-//#define TC_UNARYOP (TC_UOPPRE | TC_UOPPOST)
+-#define TC_OPERAND (TC_VARIABLE | TC_ARRAY | TC_FUNCTION \
+- | TC_BUILTIN | TC_LENGTH | TC_GETLINE \
+- | TC_SEQSTART | TC_STRING | TC_NUMBER)
+-
+-#define TC_STATEMNT (TC_STATX | TC_WHILE)
+-#define TC_OPTERM (TC_SEMICOL | TC_NEWLINE)
++#define TC_LENGTH (1 << 20) /* 'length' */
++#define TC_GETLINE (1 << 21) /* 'getline' */
++#define TC_FUNCDECL (1 << 22) /* 'function' 'func' */
++#define TC_BEGIN (1 << 23) /* 'BEGIN' */
++#define TC_END (1 << 24) /* 'END' */
++#define TC_EOF (1 << 25)
++#define TC_VARIABLE (1 << 26) /* name */
++#define TC_ARRAY (1 << 27) /* name[ */
++#define TC_FUNCTION (1 << 28) /* name( */
++#define TC_STRING (1 << 29) /* "..." */
++#define TC_NUMBER (1 << 30)
++
++#ifndef debug_parse_print_tc
++static void debug_parse_print_tc(uint32_t n)
++{
++ if (n & TC_LPAREN ) debug_printf_parse(" LPAREN" );
++ if (n & TC_RPAREN ) debug_printf_parse(" RPAREN" );
++ if (n & TC_REGEXP ) debug_printf_parse(" REGEXP" );
++ if (n & TC_OUTRDR ) debug_printf_parse(" OUTRDR" );
++ if (n & TC_UOPPOST ) debug_printf_parse(" UOPPOST" );
++ if (n & TC_UOPPRE1 ) debug_printf_parse(" UOPPRE1" );
++ if (n & TC_BINOPX ) debug_printf_parse(" BINOPX" );
++ if (n & TC_IN ) debug_printf_parse(" IN" );
++ if (n & TC_COMMA ) debug_printf_parse(" COMMA" );
++ if (n & TC_PIPE ) debug_printf_parse(" PIPE" );
++ if (n & TC_UOPPRE2 ) debug_printf_parse(" UOPPRE2" );
++ if (n & TC_ARRTERM ) debug_printf_parse(" ARRTERM" );
++ if (n & TC_LBRACE ) debug_printf_parse(" LBRACE" );
++ if (n & TC_RBRACE ) debug_printf_parse(" RBRACE" );
++ if (n & TC_SEMICOL ) debug_printf_parse(" SEMICOL" );
++ if (n & TC_NEWLINE ) debug_printf_parse(" NEWLINE" );
++ if (n & TC_STATX ) debug_printf_parse(" STATX" );
++ if (n & TC_WHILE ) debug_printf_parse(" WHILE" );
++ if (n & TC_ELSE ) debug_printf_parse(" ELSE" );
++ if (n & TC_BUILTIN ) debug_printf_parse(" BUILTIN" );
++ if (n & TC_LENGTH ) debug_printf_parse(" LENGTH" );
++ if (n & TC_GETLINE ) debug_printf_parse(" GETLINE" );
++ if (n & TC_FUNCDECL) debug_printf_parse(" FUNCDECL");
++ if (n & TC_BEGIN ) debug_printf_parse(" BEGIN" );
++ if (n & TC_END ) debug_printf_parse(" END" );
++ if (n & TC_EOF ) debug_printf_parse(" EOF" );
++ if (n & TC_VARIABLE) debug_printf_parse(" VARIABLE");
++ if (n & TC_ARRAY ) debug_printf_parse(" ARRAY" );
++ if (n & TC_FUNCTION) debug_printf_parse(" FUNCTION");
++ if (n & TC_STRING ) debug_printf_parse(" STRING" );
++ if (n & TC_NUMBER ) debug_printf_parse(" NUMBER" );
++}
++#endif
++
++/* combined token classes ("token [class] sets") */
++#define TS_UOPPRE (TC_UOPPRE1 | TC_UOPPRE2)
++
++#define TS_BINOP (TC_BINOPX | TC_COMMA | TC_PIPE | TC_IN)
++//#define TS_UNARYOP (TS_UOPPRE | TC_UOPPOST)
++#define TS_OPERAND (TC_VARIABLE | TC_ARRAY | TC_FUNCTION \
++ | TC_BUILTIN | TC_LENGTH | TC_GETLINE \
++ | TC_LPAREN | TC_STRING | TC_NUMBER)
++
++#define TS_LVALUE (TC_VARIABLE | TC_ARRAY)
++#define TS_STATEMNT (TC_STATX | TC_WHILE)
+
+ /* word tokens, cannot mean something else if not expected */
+-#define TC_WORD (TC_IN | TC_STATEMNT | TC_ELSE \
+- | TC_BUILTIN | TC_LENGTH | TC_GETLINE \
+- | TC_FUNCDECL | TC_BEGIN | TC_END)
++#define TS_WORD (TC_IN | TS_STATEMNT | TC_ELSE \
++ | TC_BUILTIN | TC_LENGTH | TC_GETLINE \
++ | TC_FUNCDECL | TC_BEGIN | TC_END)
+
+ /* discard newlines after these */
+-#define TC_NOTERM (TC_COMMA | TC_GRPSTART | TC_GRPTERM \
+- | TC_BINOP | TC_OPTERM)
++#define TS_NOTERM (TS_BINOP | TC_COMMA | TC_LBRACE | TC_RBRACE \
++ | TC_SEMICOL | TC_NEWLINE)
+
+ /* what can expression begin with */
+-#define TC_OPSEQ (TC_OPERAND | TC_UOPPRE | TC_REGEXP)
++#define TS_OPSEQ (TS_OPERAND | TS_UOPPRE | TC_REGEXP)
+ /* what can group begin with */
+-#define TC_GRPSEQ (TC_OPSEQ | TC_OPTERM | TC_STATEMNT | TC_GRPSTART)
++#define TS_GRPSEQ (TS_OPSEQ | TS_STATEMNT \
++ | TC_SEMICOL | TC_NEWLINE | TC_LBRACE)
+
+-/* if previous token class is CONCAT1 and next is CONCAT2, concatenation */
++/* if previous token class is CONCAT_L and next is CONCAT_R, concatenation */
+ /* operator is inserted between them */
+-#define TC_CONCAT1 (TC_VARIABLE | TC_ARRTERM | TC_SEQTERM \
++#define TS_CONCAT_L (TC_VARIABLE | TC_ARRTERM | TC_RPAREN \
+ | TC_STRING | TC_NUMBER | TC_UOPPOST \
+ | TC_LENGTH)
+-#define TC_CONCAT2 (TC_OPERAND | TC_UOPPRE)
++#define TS_CONCAT_R (TS_OPERAND | TS_UOPPRE)
+
+ #define OF_RES1 0x010000
+ #define OF_RES2 0x020000
+@@ -284,13 +315,12 @@ typedef struct tsplitter_s {
+ #define OF_CHECKED 0x200000
+ #define OF_REQUIRED 0x400000
+
+-
+ /* combined operator flags */
+ #define xx 0
+ #define xV OF_RES2
+ #define xS (OF_RES2 | OF_STR2)
+ #define Vx OF_RES1
+-#define Rx (OF_RES1 | OF_NUM1 | OF_REQUIRED)
++#define Rx OF_REQUIRED
+ #define VV (OF_RES1 | OF_RES2)
+ #define Nx (OF_RES1 | OF_NUM1)
+ #define NV (OF_RES1 | OF_NUM1 | OF_RES2)
+@@ -302,8 +332,7 @@ typedef struct tsplitter_s {
+ #define OPNMASK 0x007F
+
+ /* operator priority is a highest byte (even: r->l, odd: l->r grouping)
+- * For builtins it has different meaning: n n s3 s2 s1 v3 v2 v1,
+- * n - min. number of args, vN - resolve Nth arg to var, sN - resolve to string
++ * (for builtins it has different meaning)
+ */
+ #undef P
+ #undef PRIMASK
+@@ -313,10 +342,8 @@ typedef struct tsplitter_s {
+ #define PRIMASK2 0x7E000000
+
+ /* Operation classes */
+-
+ #define SHIFT_TIL_THIS 0x0600
+ #define RECUR_FROM_THIS 0x1000
+-
+ enum {
+ OC_DELETE = 0x0100, OC_EXEC = 0x0200, OC_NEWSOURCE = 0x0300,
+ OC_PRINT = 0x0400, OC_PRINTF = 0x0500, OC_WALKINIT = 0x0600,
+@@ -358,8 +385,8 @@ enum {
+ #define NTCC '\377'
+
+ static const char tokenlist[] ALIGN1 =
+- "\1(" NTC /* TC_SEQSTART */
+- "\1)" NTC /* TC_SEQTERM */
++ "\1(" NTC /* TC_LPAREN */
++ "\1)" NTC /* TC_RPAREN */
+ "\1/" NTC /* TC_REGEXP */
+ "\2>>" "\1>" "\1|" NTC /* TC_OUTRDR */
+ "\2++" "\2--" NTC /* TC_UOPPOST */
+@@ -376,8 +403,8 @@ static const char tokenlist[] ALIGN1 =
+ "\1|" NTC /* TC_PIPE */
+ "\1+" "\1-" "\1!" NTC /* TC_UOPPRE2 */
+ "\1]" NTC /* TC_ARRTERM */
+- "\1{" NTC /* TC_GRPSTART */
+- "\1}" NTC /* TC_GRPTERM */
++ "\1{" NTC /* TC_LBRACE */
++ "\1}" NTC /* TC_RBRACE */
+ "\1;" NTC /* TC_SEMICOL */
+ "\1\n" NTC /* TC_NEWLINE */
+ "\2if" "\2do" "\3for" "\5break" /* TC_STATX */
+@@ -391,7 +418,7 @@ static const char tokenlist[] ALIGN1 =
+ "\5close" "\6system" "\6fflush" "\5atan2"
+ "\3cos" "\3exp" "\3int" "\3log"
+ "\4rand" "\3sin" "\4sqrt" "\5srand"
+- "\6gensub" "\4gsub" "\5index" /* "\6length" was here */
++ "\6gensub" "\4gsub" "\5index" /* "\6length" was here */
+ "\5match" "\5split" "\7sprintf" "\3sub"
+ "\6substr" "\7systime" "\10strftime" "\6mktime"
+ "\7tolower" "\7toupper" NTC
+@@ -403,25 +430,32 @@ static const char tokenlist[] ALIGN1 =
+ /* compiler adds trailing "\0" */
+ ;
+
+-#define OC_B OC_BUILTIN
+-
+ static const uint32_t tokeninfo[] ALIGN4 = {
+ 0,
+ 0,
+- OC_REGEXP,
++#define TI_REGEXP OC_REGEXP
++ TI_REGEXP,
+ xS|'a', xS|'w', xS|'|',
+ OC_UNARY|xV|P(9)|'p', OC_UNARY|xV|P(9)|'m',
+- OC_UNARY|xV|P(9)|'P', OC_UNARY|xV|P(9)|'M', OC_FIELD|xV|P(5),
++#define TI_PREINC (OC_UNARY|xV|P(9)|'P')
++#define TI_PREDEC (OC_UNARY|xV|P(9)|'M')
++ TI_PREINC, TI_PREDEC, OC_FIELD|xV|P(5),
+ OC_COMPARE|VV|P(39)|5, OC_MOVE|VV|P(74), OC_REPLACE|NV|P(74)|'+', OC_REPLACE|NV|P(74)|'-',
+ OC_REPLACE|NV|P(74)|'*', OC_REPLACE|NV|P(74)|'/', OC_REPLACE|NV|P(74)|'%', OC_REPLACE|NV|P(74)|'&',
+ OC_BINARY|NV|P(29)|'+', OC_BINARY|NV|P(29)|'-', OC_REPLACE|NV|P(74)|'&', OC_BINARY|NV|P(15)|'&',
+ OC_BINARY|NV|P(25)|'/', OC_BINARY|NV|P(25)|'%', OC_BINARY|NV|P(15)|'&', OC_BINARY|NV|P(25)|'*',
+ OC_COMPARE|VV|P(39)|4, OC_COMPARE|VV|P(39)|3, OC_COMPARE|VV|P(39)|0, OC_COMPARE|VV|P(39)|1,
+- OC_COMPARE|VV|P(39)|2, OC_MATCH|Sx|P(45)|'!', OC_MATCH|Sx|P(45)|'~', OC_LAND|Vx|P(55),
+- OC_LOR|Vx|P(59), OC_TERNARY|Vx|P(64)|'?', OC_COLON|xx|P(67)|':',
+- OC_IN|SV|P(49), /* TC_IN */
+- OC_COMMA|SS|P(80),
+- OC_PGETLINE|SV|P(37),
++#define TI_LESS (OC_COMPARE|VV|P(39)|2)
++ TI_LESS, OC_MATCH|Sx|P(45)|'!', OC_MATCH|Sx|P(45)|'~', OC_LAND|Vx|P(55),
++#define TI_TERNARY (OC_TERNARY|Vx|P(64)|'?')
++#define TI_COLON (OC_COLON|xx|P(67)|':')
++ OC_LOR|Vx|P(59), TI_TERNARY, TI_COLON,
++#define TI_IN (OC_IN|SV|P(49))
++ TI_IN,
++#define TI_COMMA (OC_COMMA|SS|P(80))
++ TI_COMMA,
++#define TI_PGETLINE (OC_PGETLINE|SV|P(37))
++ TI_PGETLINE,
+ OC_UNARY|xV|P(19)|'+', OC_UNARY|xV|P(19)|'-', OC_UNARY|xV|P(19)|'!',
+ 0, /* ] */
+ 0,
+@@ -434,20 +468,45 @@ static const uint32_t tokeninfo[] ALIGN4 = {
+ OC_RETURN|Vx, OC_EXIT|Nx,
+ ST_WHILE,
+ 0, /* else */
+- OC_B|B_an|P(0x83), OC_B|B_co|P(0x41), OC_B|B_ls|P(0x83), OC_B|B_or|P(0x83),
+- OC_B|B_rs|P(0x83), OC_B|B_xo|P(0x83),
+- OC_FBLTIN|Sx|F_cl, OC_FBLTIN|Sx|F_sy, OC_FBLTIN|Sx|F_ff, OC_B|B_a2|P(0x83),
+- OC_FBLTIN|Nx|F_co, OC_FBLTIN|Nx|F_ex, OC_FBLTIN|Nx|F_in, OC_FBLTIN|Nx|F_lg,
+- OC_FBLTIN|F_rn, OC_FBLTIN|Nx|F_si, OC_FBLTIN|Nx|F_sq, OC_FBLTIN|Nx|F_sr,
+- OC_B|B_ge|P(0xd6), OC_B|B_gs|P(0xb6), OC_B|B_ix|P(0x9b), /* OC_FBLTIN|Sx|F_le, was here */
+- OC_B|B_ma|P(0x89), OC_B|B_sp|P(0x8b), OC_SPRINTF, OC_B|B_su|P(0xb6),
+- OC_B|B_ss|P(0x8f), OC_FBLTIN|F_ti, OC_B|B_ti|P(0x0b), OC_B|B_mt|P(0x0b),
+- OC_B|B_lo|P(0x49), OC_B|B_up|P(0x49),
+- OC_FBLTIN|Sx|F_le, /* TC_LENGTH */
+- OC_GETLINE|SV|P(0),
+- 0, 0,
+- 0,
+- 0 /* TC_END */
++// OC_B's are builtins with enforced minimum number of arguments (two upper bits).
++// Highest byte bit pattern: nn s3s2s1 v3v2v1
++// nn - min. number of args, sN - resolve Nth arg to string, vN - resolve to var
++// OC_F's are builtins with zero or one argument.
++// |Rx| enforces that arg is present for: system, close, cos, sin, exp, int, log, sqrt
++// Check for no args is present in builtins' code (not in this table): rand, systime
++// Have one _optional_ arg: fflush, srand, length
++#define OC_B OC_BUILTIN
++#define OC_F OC_FBLTIN
++#define A1 P(0x40) /*one arg*/
++#define A2 P(0x80) /*two args*/
++#define A3 P(0xc0) /*three args*/
++#define __v P(1)
++#define _vv P(3)
++#define __s__v P(9)
++#define __s_vv P(0x0b)
++#define __svvv P(0x0f)
++#define _ss_vv P(0x1b)
++#define _s_vv_ P(0x16)
++#define ss_vv_ P(0x36)
++ OC_B|B_an|_vv|A2, OC_B|B_co|__v|A1, OC_B|B_ls|_vv|A2, OC_B|B_or|_vv|A2, // and compl lshift or
++ OC_B|B_rs|_vv|A2, OC_B|B_xo|_vv|A2, // rshift xor
++ OC_F|F_cl|Sx|Rx, OC_F|F_sy|Sx|Rx, OC_F|F_ff|Sx, OC_B|B_a2|_vv|A2, // close system fflush atan2
++ OC_F|F_co|Nx|Rx, OC_F|F_ex|Nx|Rx, OC_F|F_in|Nx|Rx, OC_F|F_lg|Nx|Rx, // cos exp int log
++ OC_F|F_rn, OC_F|F_si|Nx|Rx, OC_F|F_sq|Nx|Rx, OC_F|F_sr|Nx, // rand sin sqrt srand
++ OC_B|B_ge|_s_vv_|A3,OC_B|B_gs|ss_vv_|A2,OC_B|B_ix|_ss_vv|A2, // gensub gsub index /*length was here*/
++ OC_B|B_ma|__s__v|A2,OC_B|B_sp|__s_vv|A2,OC_SPRINTF, OC_B|B_su|ss_vv_|A2,// match split sprintf sub
++ OC_B|B_ss|__svvv|A2,OC_F|F_ti, OC_B|B_ti|__s_vv, OC_B|B_mt|__s_vv, // substr systime strftime mktime
++ OC_B|B_lo|__s__v|A1,OC_B|B_up|__s__v|A1, // tolower toupper
++ OC_F|F_le|Sx, // length
++ OC_GETLINE|SV, // getline
++ 0, 0, // func function
++ 0, // BEGIN
++ 0 // END
++#undef A1
++#undef A2
++#undef A3
++#undef OC_B
++#undef OC_F
+ };
+
+ /* internal variable names and their initial values */
+@@ -488,21 +547,29 @@ struct globals {
+ chain *seq;
+ node *break_ptr, *continue_ptr;
+ rstream *iF;
+- xhash *vhash, *ahash, *fdhash, *fnhash;
++ xhash *ahash; /* argument names, used only while parsing function bodies */
++ xhash *fnhash; /* function names, used only in parsing stage */
++ xhash *vhash; /* variables and arrays */
++ //xhash *fdhash; /* file objects, used only in execution stage */
++ //we are reusing ahash as fdhash, via define (see later)
+ const char *g_progname;
+ int g_lineno;
+ int nfields;
+ int maxfields; /* used in fsrealloc() only */
+ var *Fields;
+- nvblock *g_cb;
+ char *g_pos;
+- char *g_buf;
++ char g_saved_ch;
+ smallint icase;
+ smallint exiting;
+ smallint nextrec;
+ smallint nextfile;
+ smallint is_f0_split;
+ smallint t_rollback;
++
++ /* former statics from various functions */
++ smallint next_token__concat_inserted;
++ uint32_t next_token__save_tclass;
++ uint32_t next_token__save_info;
+ };
+ struct globals2 {
+ uint32_t t_info; /* often used */
+@@ -515,32 +582,35 @@ struct globals2 {
+ /* former statics from various functions */
+ char *split_f0__fstrings;
+
+- uint32_t next_token__save_tclass;
+- uint32_t next_token__save_info;
+- uint32_t next_token__ltclass;
+- smallint next_token__concat_inserted;
+-
+- smallint next_input_file__files_happen;
+ rstream next_input_file__rsm;
++ smallint next_input_file__files_happen;
++
++ smalluint exitcode;
+
+- var *evaluate__fnargs;
+ unsigned evaluate__seed;
++ var *evaluate__fnargs;
+ regex_t evaluate__sreg;
+
+- var ptest__v;
++ var ptest__tmpvar;
++ var awk_printf__tmpvar;
++ var as_regex__tmpvar;
++ var exit__tmpvar;
++ var main__tmpvar;
+
+ tsplitter exec_builtin__tspl;
+
+ /* biggest and least used members go last */
+ tsplitter fsplitter, rsplitter;
++
++ char g_buf[MAXVARFMT + 1];
+ };
+ #define G1 (ptr_to_globals[-1])
+ #define G (*(struct globals2 *)ptr_to_globals)
+ /* For debug. nm --size-sort awk.o | grep -vi ' [tr] ' */
+-/*char G1size[sizeof(G1)]; - 0x74 */
+-/*char Gsize[sizeof(G)]; - 0x1c4 */
++//char G1size[sizeof(G1)]; // 0x70
++//char Gsize[sizeof(G)]; // 0x2f8
+ /* Trying to keep most of members accessible with short offsets: */
+-/*char Gofs_seed[offsetof(struct globals2, evaluate__seed)]; - 0x90 */
++//char Gofs_seed[offsetof(struct globals2, evaluate__seed)]; // 0x7c
+ #define t_double (G1.t_double )
+ #define beginseq (G1.beginseq )
+ #define mainseq (G1.mainseq )
+@@ -549,18 +619,20 @@ struct globals2 {
+ #define break_ptr (G1.break_ptr )
+ #define continue_ptr (G1.continue_ptr)
+ #define iF (G1.iF )
+-#define vhash (G1.vhash )
+ #define ahash (G1.ahash )
+-#define fdhash (G1.fdhash )
+ #define fnhash (G1.fnhash )
++#define vhash (G1.vhash )
++#define fdhash ahash
++//^^^^^^^^^^^^^^^^^^ ahash is cleared after every function parsing,
++// and ends up empty after parsing phase. Thus, we can simply reuse it
++// for fdhash in execution stage.
+ #define g_progname (G1.g_progname )
+ #define g_lineno (G1.g_lineno )
+ #define nfields (G1.nfields )
+ #define maxfields (G1.maxfields )
+ #define Fields (G1.Fields )
+-#define g_cb (G1.g_cb )
+ #define g_pos (G1.g_pos )
+-#define g_buf (G1.g_buf )
++#define g_saved_ch (G1.g_saved_ch )
+ #define icase (G1.icase )
+ #define exiting (G1.exiting )
+ #define nextrec (G1.nextrec )
+@@ -574,25 +646,13 @@ struct globals2 {
+ #define intvar (G.intvar )
+ #define fsplitter (G.fsplitter )
+ #define rsplitter (G.rsplitter )
++#define g_buf (G.g_buf )
+ #define INIT_G() do { \
+ SET_PTR_TO_GLOBALS((char*)xzalloc(sizeof(G1)+sizeof(G)) + sizeof(G1)); \
+- G.next_token__ltclass = TC_OPTERM; \
++ t_tclass = TC_NEWLINE; \
+ G.evaluate__seed = 1; \
+ } while (0)
+
+-
+-/* function prototypes */
+-static void handle_special(var *);
+-static node *parse_expr(uint32_t);
+-static void chain_group(void);
+-static var *evaluate(node *, var *);
+-static rstream *next_input_file(void);
+-static int fmt_num(char *, int, const char *, double, int);
+-static int awk_exit(int) NORETURN;
+-
+-/* ---- error handling ---- */
+-
+-static const char EMSG_INTERNAL_ERROR[] ALIGN1 = "Internal error";
+ static const char EMSG_UNEXP_EOS[] ALIGN1 = "Unexpected end of string";
+ static const char EMSG_UNEXP_TOKEN[] ALIGN1 = "Unexpected token";
+ static const char EMSG_DIV_BY_ZERO[] ALIGN1 = "Division by zero";
+@@ -604,10 +664,7 @@ static const char EMSG_UNDEF_FUNC[] ALIGN1 = "Call to undefined function";
+ static const char EMSG_NO_MATH[] ALIGN1 = "Math support is not compiled in";
+ static const char EMSG_NEGATIVE_FIELD[] ALIGN1 = "Access to negative field";
+
+-static void zero_out_var(var *vp)
+-{
+- memset(vp, 0, sizeof(*vp));
+-}
++static int awk_exit(void) NORETURN;
+
+ static void syntax_error(const char *message) NORETURN;
+ static void syntax_error(const char *message)
+@@ -638,12 +695,40 @@ static xhash *hash_init(void)
+ return newhash;
+ }
+
++static void hash_clear(xhash *hash)
++{
++ unsigned i;
++ hash_item *hi, *thi;
++
++ for (i = 0; i < hash->csize; i++) {
++ hi = hash->items[i];
++ while (hi) {
++ thi = hi;
++ hi = hi->next;
++//FIXME: this assumes that it's a hash of *variables*:
++ free(thi->data.v.string);
++ free(thi);
++ }
++ hash->items[i] = NULL;
++ }
++ hash->glen = hash->nel = 0;
++}
++
++#if 0 //UNUSED
++static void hash_free(xhash *hash)
++{
++ hash_clear(hash);
++ free(hash->items);
++ free(hash);
++}
++#endif
++
+ /* find item in hash, return ptr to data, NULL if not found */
+-static void *hash_search(xhash *hash, const char *name)
++static NOINLINE void *hash_search3(xhash *hash, const char *name, unsigned idx)
+ {
+ hash_item *hi;
+
+- hi = hash->items[hashidx(name) % hash->csize];
++ hi = hash->items[idx % hash->csize];
+ while (hi) {
+ if (strcmp(hi->name, name) == 0)
+ return &hi->data;
+@@ -652,6 +737,11 @@ static void *hash_search(xhash *hash, const char *name)
+ return NULL;
+ }
+
++static void *hash_search(xhash *hash, const char *name)
++{
++ return hash_search3(hash, name, hashidx(name));
++}
++
+ /* grow hash if it becomes too big */
+ static void hash_rebuild(xhash *hash)
+ {
+@@ -687,16 +777,17 @@ static void *hash_find(xhash *hash, const char *name)
+ unsigned idx;
+ int l;
+
+- hi = hash_search(hash, name);
++ idx = hashidx(name);
++ hi = hash_search3(hash, name, idx);
+ if (!hi) {
+- if (++hash->nel / hash->csize > 10)
++ if (++hash->nel > hash->csize * 8)
+ hash_rebuild(hash);
+
+ l = strlen(name) + 1;
+ hi = xzalloc(sizeof(*hi) + l);
+ strcpy(hi->name, name);
+
+- idx = hashidx(name) % hash->csize;
++ idx = idx % hash->csize;
+ hi->next = hash->items[idx];
+ hash->items[idx] = hi;
+ hash->glen += l;
+@@ -731,7 +822,7 @@ static void hash_remove(xhash *hash, const char *name)
+
+ static char *skip_spaces(char *p)
+ {
+- while (1) {
++ for (;;) {
+ if (*p == '\\' && p[1] == '\n') {
+ p++;
+ t_lineno++;
+@@ -747,8 +838,10 @@ static char *skip_spaces(char *p)
+ static char *nextword(char **s)
+ {
+ char *p = *s;
+- while (*(*s)++ != '\0')
++ char *q = p;
++ while (*q++ != '\0')
+ continue;
++ *s = q;
+ return p;
+ }
+
+@@ -811,10 +904,27 @@ static double my_strtod(char **pp)
+
+ /* -------- working with variables (set/get/copy/etc) -------- */
+
+-static xhash *iamarray(var *v)
++static void fmt_num(const char *format, double n)
+ {
+- var *a = v;
++ if (n == (long long)n) {
++ snprintf(g_buf, MAXVARFMT, "%lld", (long long)n);
++ } else {
++ const char *s = format;
++ char c;
++
++ do { c = *s; } while (c && *++s);
++ if (strchr("diouxX", c)) {
++ snprintf(g_buf, MAXVARFMT, format, (int)n);
++ } else if (strchr("eEfFgGaA", c)) {
++ snprintf(g_buf, MAXVARFMT, format, n);
++ } else {
++ syntax_error(EMSG_INV_FMT);
++ }
++ }
++}
+
++static xhash *iamarray(var *a)
++{
+ while (a->type & VF_CHILD)
+ a = a->x.parent;
+
+@@ -825,23 +935,7 @@ static xhash *iamarray(var *v)
+ return a->x.array;
+ }
+
+-static void clear_array(xhash *array)
+-{
+- unsigned i;
+- hash_item *hi, *thi;
+-
+- for (i = 0; i < array->csize; i++) {
+- hi = array->items[i];
+- while (hi) {
+- thi = hi;
+- hi = hi->next;
+- free(thi->data.v.string);
+- free(thi);
+- }
+- array->items[i] = NULL;
+- }
+- array->glen = array->nel = 0;
+-}
++#define clear_array(array) hash_clear(array)
+
+ /* clear a variable */
+ static var *clrvar(var *v)
+@@ -855,6 +949,8 @@ static var *clrvar(var *v)
+ return v;
+ }
+
++static void handle_special(var *);
++
+ /* assign string value to variable */
+ static var *setvar_p(var *v, char *value)
+ {
+@@ -901,7 +997,7 @@ static const char *getvar_s(var *v)
+ {
+ /* if v is numeric and has no cached string, convert it to string */
+ if ((v->type & (VF_NUMBER | VF_CACHED)) == VF_NUMBER) {
+- fmt_num(g_buf, MAXVARFMT, getvar_s(intvar[CONVFMT]), v->number, TRUE);
++ fmt_num(getvar_s(intvar[CONVFMT]), v->number);
+ v->string = xstrdup(g_buf);
+ v->type |= VF_CACHED;
+ }
+@@ -920,6 +1016,7 @@ static double getvar_i(var *v)
+ v->number = my_strtod(&s);
+ debug_printf_eval("%f (s:'%s')\n", v->number, s);
+ if (v->type & VF_USER) {
++//TODO: skip_spaces() also skips backslash+newline, is it intended here?
+ s = skip_spaces(s);
+ if (*s != '\0')
+ v->type &= ~VF_USER;
+@@ -981,94 +1078,28 @@ static int istrue(var *v)
+ return (v->string && v->string[0]);
+ }
+
+-/* temporary variables allocator. Last allocated should be first freed */
+-static var *nvalloc(int n)
+-{
+- nvblock *pb = NULL;
+- var *v, *r;
+- int size;
+-
+- while (g_cb) {
+- pb = g_cb;
+- if ((g_cb->pos - g_cb->nv) + n <= g_cb->size)
+- break;
+- g_cb = g_cb->next;
+- }
+-
+- if (!g_cb) {
+- size = (n <= MINNVBLOCK) ? MINNVBLOCK : n;
+- g_cb = xzalloc(sizeof(nvblock) + size * sizeof(var));
+- g_cb->size = size;
+- g_cb->pos = g_cb->nv;
+- g_cb->prev = pb;
+- /*g_cb->next = NULL; - xzalloc did it */
+- if (pb)
+- pb->next = g_cb;
+- }
+-
+- v = r = g_cb->pos;
+- g_cb->pos += n;
+-
+- while (v < g_cb->pos) {
+- v->type = 0;
+- v->string = NULL;
+- v++;
+- }
+-
+- return r;
+-}
+-
+-static void nvfree(var *v)
+-{
+- var *p;
+-
+- if (v < g_cb->nv || v >= g_cb->pos)
+- syntax_error(EMSG_INTERNAL_ERROR);
+-
+- for (p = v; p < g_cb->pos; p++) {
+- if ((p->type & (VF_ARRAY | VF_CHILD)) == VF_ARRAY) {
+- clear_array(iamarray(p));
+- free(p->x.array->items);
+- free(p->x.array);
+- }
+- if (p->type & VF_WALK) {
+- walker_list *n;
+- walker_list *w = p->x.walker;
+- debug_printf_walker("nvfree: freeing walker @%p\n", &p->x.walker);
+- p->x.walker = NULL;
+- while (w) {
+- n = w->prev;
+- debug_printf_walker(" free(%p)\n", w);
+- free(w);
+- w = n;
+- }
+- }
+- clrvar(p);
+- }
+-
+- g_cb->pos = v;
+- while (g_cb->prev && g_cb->pos == g_cb->nv) {
+- g_cb = g_cb->prev;
+- }
+-}
+-
+ /* ------- awk program text parsing ------- */
+
+-/* Parse next token pointed by global pos, place results into global ttt.
+- * If token isn't expected, give away. Return token class
++/* Parse next token pointed by global pos, place results into global t_XYZ variables.
++ * If token isn't expected, print error message and die.
++ * Return token class (also store it in t_tclass).
+ */
+ static uint32_t next_token(uint32_t expected)
+ {
+-#define concat_inserted (G.next_token__concat_inserted)
+-#define save_tclass (G.next_token__save_tclass)
+-#define save_info (G.next_token__save_info)
+-/* Initialized to TC_OPTERM: */
+-#define ltclass (G.next_token__ltclass)
++#define concat_inserted (G1.next_token__concat_inserted)
++#define save_tclass (G1.next_token__save_tclass)
++#define save_info (G1.next_token__save_info)
+
+- char *p, *s;
++ char *p;
+ const char *tl;
+- uint32_t tc;
+ const uint32_t *ti;
++ uint32_t tc, last_token_class;
++
++ last_token_class = t_tclass; /* t_tclass is initialized to TC_NEWLINE */
++
++ debug_printf_parse("%s() expected(%x):", __func__, expected);
++ debug_parse_print_tc(expected);
++ debug_printf_parse("\n");
+
+ if (t_rollback) {
+ debug_printf_parse("%s: using rolled-back token\n", __func__);
+@@ -1080,6 +1111,10 @@ static uint32_t next_token(uint32_t expected)
+ t_info = save_info;
+ } else {
+ p = g_pos;
++ if (g_saved_ch != '\0') {
++ *p = g_saved_ch;
++ g_saved_ch = '\0';
++ }
+ readnext:
+ p = skip_spaces(p);
+ g_lineno = t_lineno;
+@@ -1087,15 +1122,12 @@ static uint32_t next_token(uint32_t expected)
+ while (*p != '\n' && *p != '\0')
+ p++;
+
+- if (*p == '\n')
+- t_lineno++;
+-
+ if (*p == '\0') {
+ tc = TC_EOF;
+ debug_printf_parse("%s: token found: TC_EOF\n", __func__);
+ } else if (*p == '\"') {
+ /* it's a string */
+- t_string = s = ++p;
++ char *s = t_string = ++p;
+ while (*p != '\"') {
+ char *pp;
+ if (*p == '\0' || *p == '\n')
+@@ -1110,7 +1142,7 @@ static uint32_t next_token(uint32_t expected)
+ debug_printf_parse("%s: token found:'%s' TC_STRING\n", __func__, t_string);
+ } else if ((expected & TC_REGEXP) && *p == '/') {
+ /* it's regexp */
+- t_string = s = ++p;
++ char *s = t_string = ++p;
+ while (*p != '/') {
+ if (*p == '\0' || *p == '\n')
+ syntax_error(EMSG_UNEXP_EOS);
+@@ -1141,6 +1173,11 @@ static uint32_t next_token(uint32_t expected)
+ tc = TC_NUMBER;
+ debug_printf_parse("%s: token found:%f TC_NUMBER\n", __func__, t_double);
+ } else {
++ char *end_of_name;
++
++ if (*p == '\n')
++ t_lineno++;
++
+ /* search for something known */
+ tl = tokenlist;
+ tc = 0x00000001;
+@@ -1155,9 +1192,9 @@ static uint32_t next_token(uint32_t expected)
+ * token matches,
+ * and it's not a longer word,
+ */
+- if ((tc & (expected | TC_WORD | TC_NEWLINE))
++ if ((tc & (expected | TS_WORD | TC_NEWLINE))
+ && strncmp(p, tl, l) == 0
+- && !((tc & TC_WORD) && isalnum_(p[l]))
++ && !((tc & TS_WORD) && isalnum_(p[l]))
+ ) {
+ /* then this is what we are looking for */
+ t_info = *ti;
+@@ -1174,67 +1211,94 @@ static uint32_t next_token(uint32_t expected)
+ if (!isalnum_(*p))
+ syntax_error(EMSG_UNEXP_TOKEN); /* no */
+ /* yes */
+- t_string = --p;
+- while (isalnum_(*++p)) {
+- p[-1] = *p;
+- }
+- p[-1] = '\0';
+- tc = TC_VARIABLE;
+- /* also consume whitespace between functionname and bracket */
+- if (!(expected & TC_VARIABLE) || (expected & TC_ARRAY))
++ t_string = p;
++ while (isalnum_(*p))
++ p++;
++ end_of_name = p;
++
++ if (last_token_class == TC_FUNCDECL)
++ /* eat space in "function FUNC (...) {...}" declaration */
+ p = skip_spaces(p);
++ else if (expected & TC_ARRAY) {
++ /* eat space between array name and [ */
++ char *s = skip_spaces(p);
++ if (*s == '[') /* array ref, not just a name? */
++ p = s;
++ }
++ /* else: do NOT consume whitespace after variable name!
++ * gawk allows definition "function FUNC (p) {...}" - note space,
++ * but disallows the call "FUNC (p)" because it isn't one -
++ * expression "v (a)" should NOT be parsed as TC_FUNCTION:
++ * it is a valid concatenation if "v" is a variable,
++ * not a function name (and type of name is not known at parse time).
++ */
++
+ if (*p == '(') {
++ p++;
+ tc = TC_FUNCTION;
+ debug_printf_parse("%s: token found:'%s' TC_FUNCTION\n", __func__, t_string);
++ } else if (*p == '[') {
++ p++;
++ tc = TC_ARRAY;
++ debug_printf_parse("%s: token found:'%s' TC_ARRAY\n", __func__, t_string);
+ } else {
+- if (*p == '[') {
+- p++;
+- tc = TC_ARRAY;
+- debug_printf_parse("%s: token found:'%s' TC_ARRAY\n", __func__, t_string);
+- } else
+- debug_printf_parse("%s: token found:'%s' TC_VARIABLE\n", __func__, t_string);
++ tc = TC_VARIABLE;
++ debug_printf_parse("%s: token found:'%s' TC_VARIABLE\n", __func__, t_string);
++ if (end_of_name == p) {
++ /* there is no space for trailing NUL in t_string!
++ * We need to save the char we are going to NUL.
++ * (we'll use it in future call to next_token())
++ */
++ g_saved_ch = *end_of_name;
++// especially pathological example is V="abc"; V.2 - it's V concatenated to .2
++// (it evaluates to "abc0.2"). Because of this case, we can't simply cache
++// '.' and analyze it later: we also have to *store it back* in next
++// next_token(), in order to give my_strtod() the undamaged ".2" string.
++ }
+ }
++ *end_of_name = '\0'; /* terminate t_string */
+ }
+ token_found:
+ g_pos = p;
+
+ /* skipping newlines in some cases */
+- if ((ltclass & TC_NOTERM) && (tc & TC_NEWLINE))
++ if ((last_token_class & TS_NOTERM) && (tc & TC_NEWLINE))
+ goto readnext;
+
+ /* insert concatenation operator when needed */
+- debug_printf_parse("%s: %x %x %x concat_inserted?\n", __func__,
+- (ltclass & TC_CONCAT1), (tc & TC_CONCAT2), (expected & TC_BINOP));
+- if ((ltclass & TC_CONCAT1) && (tc & TC_CONCAT2) && (expected & TC_BINOP)
+- && !(ltclass == TC_LENGTH && tc == TC_SEQSTART) /* but not for "length(..." */
++ debug_printf_parse("%s: concat_inserted if all nonzero: %x %x %x %x\n", __func__,
++ (last_token_class & TS_CONCAT_L), (tc & TS_CONCAT_R), (expected & TS_BINOP),
++ !(last_token_class == TC_LENGTH && tc == TC_LPAREN));
++ if ((last_token_class & TS_CONCAT_L) && (tc & TS_CONCAT_R) && (expected & TS_BINOP)
++ && !(last_token_class == TC_LENGTH && tc == TC_LPAREN) /* but not for "length(..." */
+ ) {
+ concat_inserted = TRUE;
+ save_tclass = tc;
+ save_info = t_info;
+- tc = TC_BINOP;
++ tc = TC_BINOPX;
+ t_info = OC_CONCAT | SS | P(35);
+ }
+
+- debug_printf_parse("%s: t_tclass=tc=%x\n", __func__, t_tclass);
+ t_tclass = tc;
++ debug_printf_parse("%s: t_tclass=tc=%x\n", __func__, tc);
+ }
+- ltclass = t_tclass;
+-
+ /* Are we ready for this? */
+- if (!(ltclass & expected)) {
+- syntax_error((ltclass & (TC_NEWLINE | TC_EOF)) ?
++ if (!(t_tclass & expected)) {
++ syntax_error((last_token_class & (TC_NEWLINE | TC_EOF)) ?
+ EMSG_UNEXP_EOS : EMSG_UNEXP_TOKEN);
+ }
+
+- debug_printf_parse("%s: returning, ltclass:%x t_double:%f\n", __func__, ltclass, t_double);
+- return ltclass;
++ debug_printf_parse("%s: returning, t_double:%f t_tclass:", __func__, t_double);
++ debug_parse_print_tc(t_tclass);
++ debug_printf_parse("\n");
++
++ return t_tclass;
+ #undef concat_inserted
+ #undef save_tclass
+ #undef save_info
+-#undef ltclass
+ }
+
+-static void rollback_token(void)
++static ALWAYS_INLINE void rollback_token(void)
+ {
+ t_rollback = TRUE;
+ }
+@@ -1251,169 +1315,188 @@ static node *new_node(uint32_t info)
+
+ static void mk_re_node(const char *s, node *n, regex_t *re)
+ {
+- n->info = OC_REGEXP;
++ n->info = TI_REGEXP;
+ n->l.re = re;
+ n->r.ire = re + 1;
+ xregcomp(re, s, REG_EXTENDED);
+ xregcomp(re + 1, s, REG_EXTENDED | REG_ICASE);
+ }
+
+-static node *condition(void)
++static node *parse_expr(uint32_t);
++
++static node *parse_lrparen_list(void)
+ {
+- next_token(TC_SEQSTART);
+- return parse_expr(TC_SEQTERM);
++ next_token(TC_LPAREN);
++ return parse_expr(TC_RPAREN);
+ }
+
+ /* parse expression terminated by given argument, return ptr
+ * to built subtree. Terminator is eaten by parse_expr */
+-static node *parse_expr(uint32_t iexp)
++static node *parse_expr(uint32_t term_tc)
+ {
+ node sn;
+ node *cn = &sn;
+ node *vn, *glptr;
+- uint32_t tc, xtc;
++ uint32_t tc, expected_tc;
+ var *v;
+
+- debug_printf_parse("%s(%x)\n", __func__, iexp);
++ debug_printf_parse("%s() term_tc(%x):", __func__, term_tc);
++ debug_parse_print_tc(term_tc);
++ debug_printf_parse("\n");
+
+ sn.info = PRIMASK;
+ sn.r.n = sn.a.n = glptr = NULL;
+- xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP | iexp;
++ expected_tc = TS_OPERAND | TS_UOPPRE | TC_REGEXP | term_tc;
+
+- while (!((tc = next_token(xtc)) & iexp)) {
++ while (!((tc = next_token(expected_tc)) & term_tc)) {
+
+- if (glptr && (t_info == (OC_COMPARE | VV | P(39) | 2))) {
++ if (glptr && (t_info == TI_LESS)) {
+ /* input redirection (<) attached to glptr node */
+ debug_printf_parse("%s: input redir\n", __func__);
+ cn = glptr->l.n = new_node(OC_CONCAT | SS | P(37));
+ cn->a.n = glptr;
+- xtc = TC_OPERAND | TC_UOPPRE;
++ expected_tc = TS_OPERAND | TS_UOPPRE;
+ glptr = NULL;
+-
+- } else if (tc & (TC_BINOP | TC_UOPPOST)) {
+- debug_printf_parse("%s: TC_BINOP | TC_UOPPOST tc:%x\n", __func__, tc);
++ continue;
++ }
++ if (tc & (TS_BINOP | TC_UOPPOST)) {
++ debug_printf_parse("%s: TS_BINOP | TC_UOPPOST tc:%x\n", __func__, tc);
+ /* for binary and postfix-unary operators, jump back over
+ * previous operators with higher priority */
+ vn = cn;
+ while (((t_info & PRIMASK) > (vn->a.n->info & PRIMASK2))
+- || ((t_info == vn->info) && ((t_info & OPCLSMASK) == OC_COLON))
++ || ((t_info == vn->info) && t_info == TI_COLON)
+ ) {
+ vn = vn->a.n;
+ if (!vn->a.n) syntax_error(EMSG_UNEXP_TOKEN);
+ }
+- if ((t_info & OPCLSMASK) == OC_TERNARY)
++ if (t_info == TI_TERNARY)
++//TODO: why?
+ t_info += P(6);
+ cn = vn->a.n->r.n = new_node(t_info);
+ cn->a.n = vn->a.n;
+- if (tc & TC_BINOP) {
++ if (tc & TS_BINOP) {
+ cn->l.n = vn;
+- xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP;
+- if ((t_info & OPCLSMASK) == OC_PGETLINE) {
++//FIXME: this is the place to detect and reject assignments to non-lvalues.
++//Currently we allow "assignments" to consts and temporaries, nonsense like this:
++// awk 'BEGIN { "qwe" = 1 }'
++// awk 'BEGIN { 7 *= 7 }'
++// awk 'BEGIN { length("qwe") = 1 }'
++// awk 'BEGIN { (1+1) += 3 }'
++ expected_tc = TS_OPERAND | TS_UOPPRE | TC_REGEXP;
++ if (t_info == TI_PGETLINE) {
+ /* it's a pipe */
+ next_token(TC_GETLINE);
+ /* give maximum priority to this pipe */
+ cn->info &= ~PRIMASK;
+- xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
++ expected_tc = TS_OPERAND | TS_UOPPRE | TS_BINOP | term_tc;
+ }
+ } else {
+ cn->r.n = vn;
+- xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
++ expected_tc = TS_OPERAND | TS_UOPPRE | TS_BINOP | term_tc;
+ }
+ vn->a.n = cn;
++ continue;
++ }
+
+- } else {
+- debug_printf_parse("%s: other\n", __func__);
+- /* for operands and prefix-unary operators, attach them
+- * to last node */
+- vn = cn;
+- cn = vn->r.n = new_node(t_info);
+- cn->a.n = vn;
+- xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP;
+- if (tc & (TC_OPERAND | TC_REGEXP)) {
+- debug_printf_parse("%s: TC_OPERAND | TC_REGEXP\n", __func__);
+- xtc = TC_UOPPRE | TC_UOPPOST | TC_BINOP | TC_OPERAND | iexp;
+- /* one should be very careful with switch on tclass -
+- * only simple tclasses should be used! */
+- switch (tc) {
+- case TC_VARIABLE:
+- case TC_ARRAY:
+- debug_printf_parse("%s: TC_VARIABLE | TC_ARRAY\n", __func__);
+- cn->info = OC_VAR;
+- v = hash_search(ahash, t_string);
+- if (v != NULL) {
+- cn->info = OC_FNARG;
+- cn->l.aidx = v->x.aidx;
+- } else {
+- cn->l.v = newvar(t_string);
+- }
+- if (tc & TC_ARRAY) {
+- cn->info |= xS;
+- cn->r.n = parse_expr(TC_ARRTERM);
+- }
+- break;
++ debug_printf_parse("%s: other, t_info:%x\n", __func__, t_info);
++ /* for operands and prefix-unary operators, attach them
++ * to last node */
++ vn = cn;
++ cn = vn->r.n = new_node(t_info);
++ cn->a.n = vn;
+
+- case TC_NUMBER:
+- case TC_STRING:
+- debug_printf_parse("%s: TC_NUMBER | TC_STRING\n", __func__);
+- cn->info = OC_VAR;
+- v = cn->l.v = xzalloc(sizeof(var));
+- if (tc & TC_NUMBER)
+- setvar_i(v, t_double);
+- else {
+- setvar_s(v, t_string);
+- xtc &= ~TC_UOPPOST; /* "str"++ is not allowed */
+- }
+- break;
++ expected_tc = TS_OPERAND | TS_UOPPRE | TC_REGEXP;
++ if (t_info == TI_PREINC || t_info == TI_PREDEC)
++ expected_tc = TS_LVALUE | TC_UOPPRE1;
+
+- case TC_REGEXP:
+- debug_printf_parse("%s: TC_REGEXP\n", __func__);
+- mk_re_node(t_string, cn, xzalloc(sizeof(regex_t)*2));
+- break;
++ if (!(tc & (TS_OPERAND | TC_REGEXP)))
++ continue;
+
+- case TC_FUNCTION:
+- debug_printf_parse("%s: TC_FUNCTION\n", __func__);
+- cn->info = OC_FUNC;
+- cn->r.f = newfunc(t_string);
+- cn->l.n = condition();
+- break;
++ debug_printf_parse("%s: TS_OPERAND | TC_REGEXP\n", __func__);
++ expected_tc = TS_UOPPRE | TC_UOPPOST | TS_BINOP | TS_OPERAND | term_tc;
++ /* one should be very careful with switch on tclass -
++ * only simple tclasses should be used (TC_xyz, not TS_xyz) */
++ switch (tc) {
++ case TC_VARIABLE:
++ case TC_ARRAY:
++ debug_printf_parse("%s: TC_VARIABLE | TC_ARRAY\n", __func__);
++ cn->info = OC_VAR;
++ v = hash_search(ahash, t_string);
++ if (v != NULL) {
++ cn->info = OC_FNARG;
++ cn->l.aidx = v->x.aidx;
++ } else {
++ cn->l.v = newvar(t_string);
++ }
++ if (tc & TC_ARRAY) {
++ cn->info |= xS;
++ cn->r.n = parse_expr(TC_ARRTERM);
++ }
++ break;
+
+- case TC_SEQSTART:
+- debug_printf_parse("%s: TC_SEQSTART\n", __func__);
+- cn = vn->r.n = parse_expr(TC_SEQTERM);
+- if (!cn)
+- syntax_error("Empty sequence");
+- cn->a.n = vn;
+- break;
++ case TC_NUMBER:
++ case TC_STRING:
++ debug_printf_parse("%s: TC_NUMBER | TC_STRING\n", __func__);
++ cn->info = OC_VAR;
++ v = cn->l.v = xzalloc(sizeof(var));
++ if (tc & TC_NUMBER)
++ setvar_i(v, t_double);
++ else {
++ setvar_s(v, t_string);
++ expected_tc &= ~TC_UOPPOST; /* "str"++ is not allowed */
++ }
++ break;
+
+- case TC_GETLINE:
+- debug_printf_parse("%s: TC_GETLINE\n", __func__);
+- glptr = cn;
+- xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
+- break;
++ case TC_REGEXP:
++ debug_printf_parse("%s: TC_REGEXP\n", __func__);
++ mk_re_node(t_string, cn, xzalloc(sizeof(regex_t)*2));
++ break;
+
+- case TC_BUILTIN:
+- debug_printf_parse("%s: TC_BUILTIN\n", __func__);
+- cn->l.n = condition();
+- break;
++ case TC_FUNCTION:
++ debug_printf_parse("%s: TC_FUNCTION\n", __func__);
++ cn->info = OC_FUNC;
++ cn->r.f = newfunc(t_string);
++ cn->l.n = parse_expr(TC_RPAREN);
++ break;
+
+- case TC_LENGTH:
+- debug_printf_parse("%s: TC_LENGTH\n", __func__);
+- next_token(TC_SEQSTART /* length(...) */
+- | TC_OPTERM /* length; (or newline)*/
+- | TC_GRPTERM /* length } */
+- | TC_BINOPX /* length <op> NUM */
+- | TC_COMMA /* print length, 1 */
+- );
+- rollback_token();
+- if (t_tclass & TC_SEQSTART) {
+- /* It was a "(" token. Handle just like TC_BUILTIN */
+- cn->l.n = condition();
+- }
+- break;
+- }
++ case TC_LPAREN:
++ debug_printf_parse("%s: TC_LPAREN\n", __func__);
++ cn = vn->r.n = parse_expr(TC_RPAREN);
++ if (!cn)
++ syntax_error("Empty sequence");
++ cn->a.n = vn;
++ break;
++
++ case TC_GETLINE:
++ debug_printf_parse("%s: TC_GETLINE\n", __func__);
++ glptr = cn;
++ expected_tc = TS_OPERAND | TS_UOPPRE | TS_BINOP | term_tc;
++ break;
++
++ case TC_BUILTIN:
++ debug_printf_parse("%s: TC_BUILTIN\n", __func__);
++ cn->l.n = parse_lrparen_list();
++ break;
++
++ case TC_LENGTH:
++ debug_printf_parse("%s: TC_LENGTH\n", __func__);
++ tc = next_token(TC_LPAREN /* length(...) */
++ | TC_SEMICOL /* length; */
++ | TC_NEWLINE /* length<newline> */
++ | TC_RBRACE /* length } */
++ | TC_BINOPX /* length <op> NUM */
++ | TC_COMMA /* print length, 1 */
++ );
++ if (tc != TC_LPAREN)
++ rollback_token();
++ else {
++ /* It was a "(" token. Handle just like TC_BUILTIN */
++ cn->l.n = parse_expr(TC_RPAREN);
+ }
++ break;
+ }
+- }
++ } /* while() */
+
+ debug_printf_parse("%s() returns %p\n", __func__, sn.r.n);
+ return sn.r.n;
+@@ -1430,7 +1513,7 @@ static node *chain_node(uint32_t info)
+ if (seq->programname != g_progname) {
+ seq->programname = g_progname;
+ n = chain_node(OC_NEWSOURCE);
+- n->l.new_progname = xstrdup(g_progname);
++ n->l.new_progname = g_progname;
+ }
+
+ n = seq->last;
+@@ -1446,14 +1529,16 @@ static void chain_expr(uint32_t info)
+
+ n = chain_node(info);
+
+- n->l.n = parse_expr(TC_OPTERM | TC_GRPTERM);
++ n->l.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_RBRACE);
+ if ((info & OF_REQUIRED) && !n->l.n)
+ syntax_error(EMSG_TOO_FEW_ARGS);
+
+- if (t_tclass & TC_GRPTERM)
++ if (t_tclass & TC_RBRACE)
+ rollback_token();
+ }
+
++static void chain_group(void);
++
+ static node *chain_loop(node *nn)
+ {
+ node *n, *n2, *save_brk, *save_cont;
+@@ -1477,207 +1562,284 @@ static node *chain_loop(node *nn)
+ return n;
+ }
+
++static void chain_until_rbrace(void)
++{
++ uint32_t tc;
++ while ((tc = next_token(TS_GRPSEQ | TC_RBRACE)) != TC_RBRACE) {
++ debug_printf_parse("%s: !TC_RBRACE\n", __func__);
++ if (tc == TC_NEWLINE)
++ continue;
++ rollback_token();
++ chain_group();
++ }
++ debug_printf_parse("%s: TC_RBRACE\n", __func__);
++}
++
+ /* parse group and attach it to chain */
+ static void chain_group(void)
+ {
+- uint32_t c;
++ uint32_t tc;
+ node *n, *n2, *n3;
+
+ do {
+- c = next_token(TC_GRPSEQ);
+- } while (c & TC_NEWLINE);
+-
+- if (c & TC_GRPSTART) {
+- debug_printf_parse("%s: TC_GRPSTART\n", __func__);
+- while (next_token(TC_GRPSEQ | TC_GRPTERM) != TC_GRPTERM) {
+- debug_printf_parse("%s: !TC_GRPTERM\n", __func__);
+- if (t_tclass & TC_NEWLINE)
+- continue;
+- rollback_token();
+- chain_group();
+- }
+- debug_printf_parse("%s: TC_GRPTERM\n", __func__);
+- } else if (c & (TC_OPSEQ | TC_OPTERM)) {
+- debug_printf_parse("%s: TC_OPSEQ | TC_OPTERM\n", __func__);
++ tc = next_token(TS_GRPSEQ);
++ } while (tc == TC_NEWLINE);
++
++ if (tc == TC_LBRACE) {
++ debug_printf_parse("%s: TC_LBRACE\n", __func__);
++ chain_until_rbrace();
++ return;
++ }
++ if (tc & (TS_OPSEQ | TC_SEMICOL)) {
++ debug_printf_parse("%s: TS_OPSEQ | TC_SEMICOL\n", __func__);
+ rollback_token();
+ chain_expr(OC_EXEC | Vx);
+- } else {
+- /* TC_STATEMNT */
+- debug_printf_parse("%s: TC_STATEMNT(?)\n", __func__);
+- switch (t_info & OPCLSMASK) {
+- case ST_IF:
+- debug_printf_parse("%s: ST_IF\n", __func__);
+- n = chain_node(OC_BR | Vx);
+- n->l.n = condition();
++ return;
++ }
++
++ /* TS_STATEMNT */
++ debug_printf_parse("%s: TS_STATEMNT(?)\n", __func__);
++ switch (t_info & OPCLSMASK) {
++ case ST_IF:
++ debug_printf_parse("%s: ST_IF\n", __func__);
++ n = chain_node(OC_BR | Vx);
++ n->l.n = parse_lrparen_list();
++ chain_group();
++ n2 = chain_node(OC_EXEC);
++ n->r.n = seq->last;
++ if (next_token(TS_GRPSEQ | TC_RBRACE | TC_ELSE) == TC_ELSE) {
+ chain_group();
+- n2 = chain_node(OC_EXEC);
+- n->r.n = seq->last;
+- if (next_token(TC_GRPSEQ | TC_GRPTERM | TC_ELSE) == TC_ELSE) {
+- chain_group();
+- n2->a.n = seq->last;
+- } else {
+- rollback_token();
+- }
+- break;
++ n2->a.n = seq->last;
++ } else {
++ rollback_token();
++ }
++ break;
+
+- case ST_WHILE:
+- debug_printf_parse("%s: ST_WHILE\n", __func__);
+- n2 = condition();
+- n = chain_loop(NULL);
+- n->l.n = n2;
+- break;
++ case ST_WHILE:
++ debug_printf_parse("%s: ST_WHILE\n", __func__);
++ n2 = parse_lrparen_list();
++ n = chain_loop(NULL);
++ n->l.n = n2;
++ break;
+
+- case ST_DO:
+- debug_printf_parse("%s: ST_DO\n", __func__);
+- n2 = chain_node(OC_EXEC);
+- n = chain_loop(NULL);
+- n2->a.n = n->a.n;
+- next_token(TC_WHILE);
+- n->l.n = condition();
+- break;
++ case ST_DO:
++ debug_printf_parse("%s: ST_DO\n", __func__);
++ n2 = chain_node(OC_EXEC);
++ n = chain_loop(NULL);
++ n2->a.n = n->a.n;
++ next_token(TC_WHILE);
++ n->l.n = parse_lrparen_list();
++ break;
+
+- case ST_FOR:
+- debug_printf_parse("%s: ST_FOR\n", __func__);
+- next_token(TC_SEQSTART);
+- n2 = parse_expr(TC_SEMICOL | TC_SEQTERM);
+- if (t_tclass & TC_SEQTERM) { /* for-in */
+- if (!n2 || (n2->info & OPCLSMASK) != OC_IN)
+- syntax_error(EMSG_UNEXP_TOKEN);
+- n = chain_node(OC_WALKINIT | VV);
+- n->l.n = n2->l.n;
+- n->r.n = n2->r.n;
+- n = chain_loop(NULL);
+- n->info = OC_WALKNEXT | Vx;
+- n->l.n = n2->l.n;
+- } else { /* for (;;) */
+- n = chain_node(OC_EXEC | Vx);
+- n->l.n = n2;
+- n2 = parse_expr(TC_SEMICOL);
+- n3 = parse_expr(TC_SEQTERM);
+- n = chain_loop(n3);
+- n->l.n = n2;
+- if (!n2)
+- n->info = OC_EXEC;
+- }
+- break;
++ case ST_FOR:
++ debug_printf_parse("%s: ST_FOR\n", __func__);
++ next_token(TC_LPAREN);
++ n2 = parse_expr(TC_SEMICOL | TC_RPAREN);
++ if (t_tclass & TC_RPAREN) { /* for (I in ARRAY) */
++ if (!n2 || n2->info != TI_IN)
++ syntax_error(EMSG_UNEXP_TOKEN);
++ n = chain_node(OC_WALKINIT | VV);
++ n->l.n = n2->l.n;
++ n->r.n = n2->r.n;
++ n = chain_loop(NULL);
++ n->info = OC_WALKNEXT | Vx;
++ n->l.n = n2->l.n;
++ } else { /* for (;;) */
++ n = chain_node(OC_EXEC | Vx);
++ n->l.n = n2;
++ n2 = parse_expr(TC_SEMICOL);
++ n3 = parse_expr(TC_RPAREN);
++ n = chain_loop(n3);
++ n->l.n = n2;
++ if (!n2)
++ n->info = OC_EXEC;
++ }
++ break;
+
+- case OC_PRINT:
+- case OC_PRINTF:
+- debug_printf_parse("%s: OC_PRINT[F]\n", __func__);
+- n = chain_node(t_info);
+- n->l.n = parse_expr(TC_OPTERM | TC_OUTRDR | TC_GRPTERM);
+- if (t_tclass & TC_OUTRDR) {
+- n->info |= t_info;
+- n->r.n = parse_expr(TC_OPTERM | TC_GRPTERM);
+- }
+- if (t_tclass & TC_GRPTERM)
+- rollback_token();
+- break;
++ case OC_PRINT:
++ case OC_PRINTF:
++ debug_printf_parse("%s: OC_PRINT[F]\n", __func__);
++ n = chain_node(t_info);
++ n->l.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_OUTRDR | TC_RBRACE);
++ if (t_tclass & TC_OUTRDR) {
++ n->info |= t_info;
++ n->r.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_RBRACE);
++ }
++ if (t_tclass & TC_RBRACE)
++ rollback_token();
++ break;
+
+- case OC_BREAK:
+- debug_printf_parse("%s: OC_BREAK\n", __func__);
+- n = chain_node(OC_EXEC);
+- n->a.n = break_ptr;
+- chain_expr(t_info);
+- break;
++ case OC_BREAK:
++ debug_printf_parse("%s: OC_BREAK\n", __func__);
++ n = chain_node(OC_EXEC);
++ if (!break_ptr)
++ syntax_error("'break' not in a loop");
++ n->a.n = break_ptr;
++ chain_expr(t_info);
++ break;
+
+- case OC_CONTINUE:
+- debug_printf_parse("%s: OC_CONTINUE\n", __func__);
+- n = chain_node(OC_EXEC);
+- n->a.n = continue_ptr;
+- chain_expr(t_info);
+- break;
++ case OC_CONTINUE:
++ debug_printf_parse("%s: OC_CONTINUE\n", __func__);
++ n = chain_node(OC_EXEC);
++ if (!continue_ptr)
++ syntax_error("'continue' not in a loop");
++ n->a.n = continue_ptr;
++ chain_expr(t_info);
++ break;
+
+- /* delete, next, nextfile, return, exit */
+- default:
+- debug_printf_parse("%s: default\n", __func__);
+- chain_expr(t_info);
+- }
++ /* delete, next, nextfile, return, exit */
++ default:
++ debug_printf_parse("%s: default\n", __func__);
++ chain_expr(t_info);
+ }
+ }
+
+ static void parse_program(char *p)
+ {
+- uint32_t tclass;
+- node *cn;
+- func *f;
+- var *v;
++ debug_printf_parse("%s()\n", __func__);
+
+ g_pos = p;
+ t_lineno = 1;
+- while ((tclass = next_token(TC_EOF | TC_OPSEQ | TC_GRPSTART |
+- TC_OPTERM | TC_BEGIN | TC_END | TC_FUNCDECL)) != TC_EOF) {
++ for (;;) {
++ uint32_t tclass;
+
+- if (tclass & TC_OPTERM) {
+- debug_printf_parse("%s: TC_OPTERM\n", __func__);
++ tclass = next_token(TS_OPSEQ | TC_LBRACE | TC_BEGIN | TC_END | TC_FUNCDECL
++ | TC_EOF | TC_NEWLINE /* but not TC_SEMICOL */);
++ got_tok:
++ if (tclass == TC_EOF) {
++ debug_printf_parse("%s: TC_EOF\n", __func__);
++ break;
++ }
++ if (tclass == TC_NEWLINE) {
++ debug_printf_parse("%s: TC_NEWLINE\n", __func__);
+ continue;
+ }
+-
+- seq = &mainseq;
+- if (tclass & TC_BEGIN) {
++ if (tclass == TC_BEGIN) {
+ debug_printf_parse("%s: TC_BEGIN\n", __func__);
+ seq = &beginseq;
+- chain_group();
+- } else if (tclass & TC_END) {
++ /* ensure there is no newline between BEGIN and { */
++ next_token(TC_LBRACE);
++ chain_until_rbrace();
++ goto next_tok;
++ }
++ if (tclass == TC_END) {
+ debug_printf_parse("%s: TC_END\n", __func__);
+ seq = &endseq;
+- chain_group();
+- } else if (tclass & TC_FUNCDECL) {
++ /* ensure there is no newline between END and { */
++ next_token(TC_LBRACE);
++ chain_until_rbrace();
++ goto next_tok;
++ }
++ if (tclass == TC_FUNCDECL) {
++ func *f;
++
+ debug_printf_parse("%s: TC_FUNCDECL\n", __func__);
+ next_token(TC_FUNCTION);
+- g_pos++;
+ f = newfunc(t_string);
+- f->body.first = NULL;
+- f->nargs = 0;
+- /* Match func arg list: a comma sep list of >= 0 args, and a close paren */
+- while (next_token(TC_VARIABLE | TC_SEQTERM | TC_COMMA)) {
+- /* Either an empty arg list, or trailing comma from prev iter
+- * must be followed by an arg */
+- if (f->nargs == 0 && t_tclass == TC_SEQTERM)
+- break;
+-
+- /* TC_SEQSTART/TC_COMMA must be followed by TC_VARIABLE */
+- if (t_tclass != TC_VARIABLE)
++ if (f->defined)
++ syntax_error("Duplicate function");
++ f->defined = 1;
++ //f->body.first = NULL; - already is
++ //f->nargs = 0; - already is
++ /* func arg list: comma sep list of args, and a close paren */
++ for (;;) {
++ var *v;
++ if (next_token(TC_VARIABLE | TC_RPAREN) == TC_RPAREN) {
++ if (f->nargs == 0)
++ break; /* func() is ok */
++ /* func(a,) is not ok */
+ syntax_error(EMSG_UNEXP_TOKEN);
+-
++ }
+ v = findvar(ahash, t_string);
+ v->x.aidx = f->nargs++;
+-
+ /* Arg followed either by end of arg list or 1 comma */
+- if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
++ if (next_token(TC_COMMA | TC_RPAREN) == TC_RPAREN)
+ break;
+- if (t_tclass != TC_COMMA)
+- syntax_error(EMSG_UNEXP_TOKEN);
++ /* it was a comma, we ate it */
+ }
+ seq = &f->body;
+- chain_group();
+- clear_array(ahash);
+- } else if (tclass & TC_OPSEQ) {
+- debug_printf_parse("%s: TC_OPSEQ\n", __func__);
++ /* ensure there is { after "func F(...)" - but newlines are allowed */
++ while (next_token(TC_LBRACE | TC_NEWLINE) == TC_NEWLINE)
++ continue;
++ chain_until_rbrace();
++ hash_clear(ahash);
++ goto next_tok;
++ }
++ seq = &mainseq;
++ if (tclass & TS_OPSEQ) {
++ node *cn;
++
++ debug_printf_parse("%s: TS_OPSEQ\n", __func__);
+ rollback_token();
+ cn = chain_node(OC_TEST);
+- cn->l.n = parse_expr(TC_OPTERM | TC_EOF | TC_GRPSTART);
+- if (t_tclass & TC_GRPSTART) {
+- debug_printf_parse("%s: TC_GRPSTART\n", __func__);
+- rollback_token();
+- chain_group();
++ cn->l.n = parse_expr(TC_SEMICOL | TC_NEWLINE | TC_EOF | TC_LBRACE);
++ if (t_tclass == TC_LBRACE) {
++ debug_printf_parse("%s: TC_LBRACE\n", __func__);
++ chain_until_rbrace();
+ } else {
+- debug_printf_parse("%s: !TC_GRPSTART\n", __func__);
++ /* no action, assume default "{ print }" */
++ debug_printf_parse("%s: !TC_LBRACE\n", __func__);
+ chain_node(OC_PRINT);
+ }
+ cn->r.n = mainseq.last;
+- } else /* if (tclass & TC_GRPSTART) */ {
+- debug_printf_parse("%s: TC_GRPSTART(?)\n", __func__);
+- rollback_token();
+- chain_group();
++ goto next_tok;
+ }
+- }
+- debug_printf_parse("%s: TC_EOF\n", __func__);
++ /* tclass == TC_LBRACE */
++ debug_printf_parse("%s: TC_LBRACE(?)\n", __func__);
++ chain_until_rbrace();
++ next_tok:
++ /* Same as next_token() at the top of the loop, + TC_SEMICOL */
++ tclass = next_token(TS_OPSEQ | TC_LBRACE | TC_BEGIN | TC_END | TC_FUNCDECL
++ | TC_EOF | TC_NEWLINE | TC_SEMICOL);
++ /* gawk allows many newlines, but does not allow more than one semicolon:
++ * BEGIN {...}<newline>;<newline>;
++ * would complain "each rule must have a pattern or an action part".
++ * Same message for
++ * ; BEGIN {...}
++ */
++ if (tclass != TC_SEMICOL)
++ goto got_tok; /* use this token */
++ /* else: loop back - ate the semicolon, get and use _next_ token */
++ } /* for (;;) */
+ }
+
+-
+ /* -------- program execution part -------- */
+
++/* temporary variables allocator */
++static var *nvalloc(int sz)
++{
++ return xzalloc(sz * sizeof(var));
++}
++
++static void nvfree(var *v, int sz)
++{
++ var *p = v;
++
++ while (--sz >= 0) {
++ if ((p->type & (VF_ARRAY | VF_CHILD)) == VF_ARRAY) {
++ clear_array(iamarray(p));
++ free(p->x.array->items);
++ free(p->x.array);
++ }
++ if (p->type & VF_WALK) {
++ walker_list *n;
++ walker_list *w = p->x.walker;
++ debug_printf_walker("nvfree: freeing walker @%p\n", &p->x.walker);
++ p->x.walker = NULL;
++ while (w) {
++ n = w->prev;
++ debug_printf_walker(" free(%p)\n", w);
++ free(w);
++ w = n;
++ }
++ }
++ clrvar(p);
++ p++;
++ }
++
++ free(v);
++}
++
+ static node *mk_splitter(const char *s, tsplitter *spl)
+ {
+ regex_t *re, *ire;
+@@ -1686,7 +1848,7 @@ static node *mk_splitter(const char *s, tsplitter *spl)
+ re = &spl->re[0];
+ ire = &spl->re[1];
+ n = &spl->n;
+- if ((n->info & OPCLSMASK) == OC_REGEXP) {
++ if (n->info == TI_REGEXP) {
+ regfree(re);
+ regfree(ire); // TODO: nuke ire, use re+1?
+ }
+@@ -1699,21 +1861,28 @@ static node *mk_splitter(const char *s, tsplitter *spl)
+ return n;
+ }
+
+-/* use node as a regular expression. Supplied with node ptr and regex_t
++static var *evaluate(node *, var *);
++
++/* Use node as a regular expression. Supplied with node ptr and regex_t
+ * storage space. Return ptr to regex (if result points to preg, it should
+- * be later regfree'd manually
++ * be later regfree'd manually).
+ */
+ static regex_t *as_regex(node *op, regex_t *preg)
+ {
+ int cflags;
+- var *v;
+ const char *s;
+
+- if ((op->info & OPCLSMASK) == OC_REGEXP) {
++ if (op->info == TI_REGEXP) {
+ return icase ? op->r.ire : op->l.re;
+ }
+- v = nvalloc(1);
+- s = getvar_s(evaluate(op, v));
++
++ //tmpvar = nvalloc(1);
++#define TMPVAR (&G.as_regex__tmpvar)
++ // We use a single "static" tmpvar (instead of on-stack or malloced one)
++ // to decrease memory consumption in deeply-recursive awk programs.
++ // The rule to work safely is to never call evaluate() while our static
++ // TMPVAR's value is still needed.
++ s = getvar_s(evaluate(op, TMPVAR));
+
+ cflags = icase ? REG_EXTENDED | REG_ICASE : REG_EXTENDED;
+ /* Testcase where REG_EXTENDED fails (unpaired '{'):
+@@ -1725,7 +1894,8 @@ static regex_t *as_regex(node *op, regex_t *preg)
+ cflags &= ~REG_EXTENDED;
+ xregcomp(preg, s, cflags);
+ }
+- nvfree(v);
++ //nvfree(tmpvar, 1);
++#undef TMPVAR
+ return preg;
+ }
+
+@@ -1745,12 +1915,22 @@ static char* qrealloc(char *b, int n, int *size)
+ /* resize field storage space */
+ static void fsrealloc(int size)
+ {
+- int i;
++ int i, newsize;
+
+ if (size >= maxfields) {
++ /* Sanity cap, easier than catering for overflows */
++ if (size > 0xffffff)
++ bb_die_memory_exhausted();
++
+ i = maxfields;
+ maxfields = size + 16;
+- Fields = xrealloc(Fields, maxfields * sizeof(Fields[0]));
++
++ newsize = maxfields * sizeof(Fields[0]);
++ debug_printf_eval("fsrealloc: xrealloc(%p, %u)\n", Fields, newsize);
++ Fields = xrealloc(Fields, newsize);
++ debug_printf_eval("fsrealloc: Fields=%p..%p\n", Fields, (char*)Fields + newsize - 1);
++ /* ^^^ did Fields[] move? debug aid for L.v getting "upstaged" by R.v in evaluate() */
++
+ for (; i < maxfields; i++) {
+ Fields[i].type = VF_SPECIAL;
+ Fields[i].string = NULL;
+@@ -1802,13 +1982,13 @@ static int awk_split(const char *s, node *spl, char **slist)
+ c[2] = '\n';
+
+ n = 0;
+- if ((spl->info & OPCLSMASK) == OC_REGEXP) { /* regex split */
++ if (spl->info == TI_REGEXP) { /* regex split */
+ if (!*s)
+ return n; /* "": zero fields */
+ n++; /* at least one field will be there */
+ do {
+ int l;
+- regmatch_t pmatch[2]; // TODO: why [2]? [1] is enough...
++ regmatch_t pmatch[1];
+
+ l = strcspn(s, c+2); /* len till next NUL or \n */
+ if (regexec1_nonempty(icase ? spl->r.ire : spl->l.re, s, pmatch) == 0
+@@ -1969,7 +2149,7 @@ static node *nextarg(node **pn)
+ node *n;
+
+ n = *pn;
+- if (n && (n->info & OPCLSMASK) == OC_COMMA) {
++ if (n && n->info == TI_COMMA) {
+ *pn = n->r.n;
+ n = n->l.n;
+ } else {
+@@ -2000,8 +2180,7 @@ static void hashwalk_init(var *v, xhash *array)
+ for (i = 0; i < array->csize; i++) {
+ hi = array->items[i];
+ while (hi) {
+- strcpy(w->end, hi->name);
+- nextword(&w->end);
++ w->end = stpcpy(w->end, hi->name) + 1;
+ hi = hi->next;
+ }
+ }
+@@ -2027,15 +2206,18 @@ static int hashwalk_next(var *v)
+ /* evaluate node, return 1 when result is true, 0 otherwise */
+ static int ptest(node *pattern)
+ {
+- /* ptest__v is "static": to save stack space? */
+- return istrue(evaluate(pattern, &G.ptest__v));
++ // We use a single "static" tmpvar (instead of on-stack or malloced one)
++ // to decrease memory consumption in deeply-recursive awk programs.
++ // The rule to work safely is to never call evaluate() while our static
++ // TMPVAR's value is still needed.
++ return istrue(evaluate(pattern, &G.ptest__tmpvar));
+ }
+
+ /* read next record from stream rsm into a variable v */
+ static int awk_getline(rstream *rsm, var *v)
+ {
+ char *b;
+- regmatch_t pmatch[2]; // TODO: why [2]? [1] is enough...
++ regmatch_t pmatch[1];
+ int size, a, p, pp = 0;
+ int fd, so, eo, r, rp;
+ char c, *m, *s;
+@@ -2061,7 +2243,7 @@ static int awk_getline(rstream *rsm, var *v)
+ so = eo = p;
+ r = 1;
+ if (p > 0) {
+- if ((rsplitter.n.info & OPCLSMASK) == OC_REGEXP) {
++ if (rsplitter.n.info == TI_REGEXP) {
+ if (regexec(icase ? rsplitter.n.r.ire : rsplitter.n.l.re,
+ b, 1, pmatch, 0) == 0) {
+ so = pmatch[0].rm_so;
+@@ -2133,82 +2315,126 @@ static int awk_getline(rstream *rsm, var *v)
+ return r;
+ }
+
+-static int fmt_num(char *b, int size, const char *format, double n, int int_as_int)
+-{
+- int r = 0;
+- char c;
+- const char *s = format;
+-
+- if (int_as_int && n == (long long)n) {
+- r = snprintf(b, size, "%lld", (long long)n);
+- } else {
+- do { c = *s; } while (c && *++s);
+- if (strchr("diouxX", c)) {
+- r = snprintf(b, size, format, (int)n);
+- } else if (strchr("eEfgG", c)) {
+- r = snprintf(b, size, format, n);
+- } else {
+- syntax_error(EMSG_INV_FMT);
+- }
+- }
+- return r;
+-}
+-
+ /* formatted output into an allocated buffer, return ptr to buffer */
+-static char *awk_printf(node *n)
++#if !ENABLE_FEATURE_AWK_GNU_EXTENSIONS
++# define awk_printf(a, b) awk_printf(a)
++#endif
++static char *awk_printf(node *n, size_t *len)
+ {
+- char *b = NULL;
+- char *fmt, *s, *f;
+- const char *s1;
+- int i, j, incr, bsize;
+- char c, c1;
+- var *v, *arg;
+-
+- v = nvalloc(1);
+- fmt = f = xstrdup(getvar_s(evaluate(nextarg(&n), v)));
+-
++ char *b;
++ char *fmt, *f;
++ size_t i;
++
++ //tmpvar = nvalloc(1);
++#define TMPVAR (&G.awk_printf__tmpvar)
++ // We use a single "static" tmpvar (instead of on-stack or malloced one)
++ // to decrease memory consumption in deeply-recursive awk programs.
++ // The rule to work safely is to never call evaluate() while our static
++ // TMPVAR's value is still needed.
++ fmt = f = xstrdup(getvar_s(evaluate(nextarg(&n), TMPVAR)));
++ // ^^^^^^^^^ here we immediately strdup() the value, so the later call
++ // to evaluate() potentially recursing into another awk_printf() can't
++ // mangle the value.
++
++ b = NULL;
+ i = 0;
+- while (*f) {
++ while (1) { /* "print one format spec" loop */
++ char *s;
++ char c;
++ char sv;
++ var *arg;
++ size_t slen;
++
++ /* Find end of the next format spec, or end of line */
+ s = f;
+- while (*f && (*f != '%' || *++f == '%'))
+- f++;
+- while (*f && !isalpha(*f)) {
+- if (*f == '*')
+- syntax_error("%*x formats are not supported");
++ while (1) {
++ c = *f;
++ if (!c) /* no percent chars found at all */
++ goto nul;
+ f++;
++ if (c == '%')
++ break;
+ }
+-
+- incr = (f - s) + MAXVARFMT;
+- b = qrealloc(b, incr + i, &bsize);
++ /* we are past % in "....%..." */
+ c = *f;
+- if (c != '\0')
++ if (!c) /* "....%" */
++ goto nul;
++ if (c == '%') { /* "....%%...." */
++ slen = f - s;
++ s = xstrndup(s, slen);
+ f++;
+- c1 = *f;
++ goto append; /* print "....%" part verbatim */
++ }
++ while (1) {
++ if (isalpha(c))
++ break;
++ if (c == '*')
++ syntax_error("%*x formats are not supported");
++ c = *++f;
++ if (!c) { /* "....%...." and no letter found after % */
++ /* Example: awk 'BEGIN { printf "^^^%^^^\n"; }' */
++ nul:
++ slen = f - s;
++ goto tail; /* print remaining string, exit loop */
++ }
++ }
++ /* we are at A in "....%...A..." */
++
++ arg = evaluate(nextarg(&n), TMPVAR);
++
++ /* Result can be arbitrarily long. Example:
++ * printf "%99999s", "BOOM"
++ */
++ sv = *++f;
+ *f = '\0';
+- arg = evaluate(nextarg(&n), v);
+-
+- j = i;
+- if (c == 'c' || !c) {
+- i += sprintf(b+i, s, is_numeric(arg) ?
+- (char)getvar_i(arg) : *getvar_s(arg));
+- } else if (c == 's') {
+- s1 = getvar_s(arg);
+- b = qrealloc(b, incr+i+strlen(s1), &bsize);
+- i += sprintf(b+i, s, s1);
++ if (c == 'c') {
++ char cc = is_numeric(arg) ? getvar_i(arg) : *getvar_s(arg);
++ char *r = xasprintf(s, cc ? cc : '^' /* else strlen will be wrong */);
++ slen = strlen(r);
++ if (cc == '\0') /* if cc is NUL, re-format the string with it */
++ sprintf(r, s, cc);
++ s = r;
+ } else {
+- i += fmt_num(b+i, incr, s, getvar_i(arg), FALSE);
++ if (c == 's') {
++ s = xasprintf(s, getvar_s(arg));
++ } else {
++ double d = getvar_i(arg);
++ if (strchr("diouxX", c)) {
++//TODO: make it wider here (%x -> %llx etc)?
++ s = xasprintf(s, (int)d);
++ } else if (strchr("eEfFgGaA", c)) {
++ s = xasprintf(s, d);
++ } else {
++//TODO: GNU Awk 5.0.1: printf "%W" prints "%W", does not error out
++ syntax_error(EMSG_INV_FMT);
++ }
++ }
++ slen = strlen(s);
+ }
+- *f = c1;
+-
+- /* if there was an error while sprintf, return value is negative */
+- if (i < j)
+- i = j;
++ *f = sv;
++ append:
++ if (i == 0) {
++ b = s;
++ i = slen;
++ continue;
++ }
++ tail:
++ b = xrealloc(b, i + slen + 1);
++ strcpy(b + i, s);
++ i += slen;
++ if (!c) /* s is NOT allocated and this is the last part of string? */
++ break;
++ free(s);
+ }
+
+ free(fmt);
+- nvfree(v);
+- b = xrealloc(b, i + 1);
+- b[i] = '\0';
++ //nvfree(tmpvar, 1);
++#undef TMPVAR
++
++#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
++ if (len)
++ *len = i;
++#endif
+ return b;
+ }
+
+@@ -2338,33 +2564,59 @@ static NOINLINE int do_mktime(const char *ds)
+ return mktime(&then);
+ }
+
++/* Reduce stack usage in exec_builtin() by keeping match() code separate */
++static NOINLINE var *do_match(node *an1, const char *as0)
++{
++ regmatch_t pmatch[1];
++ regex_t sreg, *re;
++ int n, start, len;
++
++ re = as_regex(an1, &sreg);
++ n = regexec(re, as0, 1, pmatch, 0);
++ if (re == &sreg)
++ regfree(re);
++ start = 0;
++ len = -1;
++ if (n == 0) {
++ start = pmatch[0].rm_so + 1;
++ len = pmatch[0].rm_eo - pmatch[0].rm_so;
++ }
++ setvar_i(newvar("RLENGTH"), len);
++ return setvar_i(newvar("RSTART"), start);
++}
++
++/* Reduce stack usage in evaluate() by keeping builtins' code separate */
+ static NOINLINE var *exec_builtin(node *op, var *res)
+ {
+ #define tspl (G.exec_builtin__tspl)
+
+- var *tv;
++ var *tmpvars;
+ node *an[4];
+ var *av[4];
+ const char *as[4];
+- regmatch_t pmatch[2];
+- regex_t sreg, *re;
+ node *spl;
+ uint32_t isr, info;
+ int nargs;
+ time_t tt;
+ int i, l, ll, n;
+
+- tv = nvalloc(4);
++ tmpvars = nvalloc(4);
++#define TMPVAR0 (tmpvars)
++#define TMPVAR1 (tmpvars + 1)
++#define TMPVAR2 (tmpvars + 2)
++#define TMPVAR3 (tmpvars + 3)
++#define TMPVAR(i) (tmpvars + (i))
+ isr = info = op->info;
+ op = op->l.n;
+
+ av[2] = av[3] = NULL;
+ for (i = 0; i < 4 && op; i++) {
+ an[i] = nextarg(&op);
+- if (isr & 0x09000000)
+- av[i] = evaluate(an[i], &tv[i]);
+- if (isr & 0x08000000)
+- as[i] = getvar_s(av[i]);
++ if (isr & 0x09000000) {
++ av[i] = evaluate(an[i], TMPVAR(i));
++ if (isr & 0x08000000)
++ as[i] = getvar_s(av[i]);
++ }
+ isr >>= 1;
+ }
+
+@@ -2386,8 +2638,8 @@ static NOINLINE var *exec_builtin(node *op, var *res)
+ char *s, *s1;
+
+ if (nargs > 2) {
+- spl = (an[2]->info & OPCLSMASK) == OC_REGEXP ?
+- an[2] : mk_splitter(getvar_s(evaluate(an[2], &tv[2])), &tspl);
++ spl = (an[2]->info == TI_REGEXP) ? an[2]
++ : mk_splitter(getvar_s(evaluate(an[2], TMPVAR2)), &tspl);
+ } else {
+ spl = &fsplitter.n;
+ }
+@@ -2501,20 +2753,7 @@ static NOINLINE var *exec_builtin(node *op, var *res)
+ break;
+
+ case B_ma:
+- re = as_regex(an[1], &sreg);
+- n = regexec(re, as[0], 1, pmatch, 0);
+- if (n == 0) {
+- pmatch[0].rm_so++;
+- pmatch[0].rm_eo++;
+- } else {
+- pmatch[0].rm_so = 0;
+- pmatch[0].rm_eo = -1;
+- }
+- setvar_i(newvar("RSTART"), pmatch[0].rm_so);
+- setvar_i(newvar("RLENGTH"), pmatch[0].rm_eo - pmatch[0].rm_so);
+- setvar_i(res, pmatch[0].rm_so);
+- if (re == &sreg)
+- regfree(re);
++ res = do_match(an[1], as[0]);
+ break;
+
+ case B_ge:
+@@ -2530,14 +2769,79 @@ static NOINLINE var *exec_builtin(node *op, var *res)
+ break;
+ }
+
+- nvfree(tv);
++ nvfree(tmpvars, 4);
++#undef TMPVAR0
++#undef TMPVAR1
++#undef TMPVAR2
++#undef TMPVAR3
++#undef TMPVAR
++
+ return res;
+ #undef tspl
+ }
+
++/* if expr looks like "var=value", perform assignment and return 1,
++ * otherwise return 0 */
++static int is_assignment(const char *expr)
++{
++ char *exprc, *val;
++
++ val = (char*)endofname(expr);
++ if (val == (char*)expr || *val != '=') {
++ return FALSE;
++ }
++
++ exprc = xstrdup(expr);
++ val = exprc + (val - expr);
++ *val++ = '\0';
++
++ unescape_string_in_place(val);
++ setvar_u(newvar(exprc), val);
++ free(exprc);
++ return TRUE;
++}
++
++/* switch to next input file */
++static rstream *next_input_file(void)
++{
++#define rsm (G.next_input_file__rsm)
++#define files_happen (G.next_input_file__files_happen)
++
++ const char *fname, *ind;
++
++ if (rsm.F)
++ fclose(rsm.F);
++ rsm.F = NULL;
++ rsm.pos = rsm.adv = 0;
++
++ for (;;) {
++ if (getvar_i(intvar[ARGIND])+1 >= getvar_i(intvar[ARGC])) {
++ if (files_happen)
++ return NULL;
++ fname = "-";
++ rsm.F = stdin;
++ break;
++ }
++ ind = getvar_s(incvar(intvar[ARGIND]));
++ fname = getvar_s(findvar(iamarray(intvar[ARGV]), ind));
++ if (fname && *fname && !is_assignment(fname)) {
++ rsm.F = xfopen_stdin(fname);
++ break;
++ }
++ }
++
++ files_happen = TRUE;
++ setvar_s(intvar[FILENAME], fname);
++ return &rsm;
++#undef rsm
++#undef files_happen
++}
++
+ /*
+ * Evaluate node - the heart of the program. Supplied with subtree
+- * and place where to store result. returns ptr to result.
++ * and "res" variable to assign the result to if we evaluate an expression.
++ * If node refers to e.g. a variable or a field, no assignment happens.
++ * Return ptr to the result (which may or may not be the "res" variable!)
+ */
+ #define XC(n) ((n) >> 8)
+
+@@ -2549,14 +2853,16 @@ static var *evaluate(node *op, var *res)
+ #define seed (G.evaluate__seed)
+ #define sreg (G.evaluate__sreg)
+
+- var *v1;
++ var *tmpvars;
+
+ if (!op)
+ return setvar_s(res, NULL);
+
+ debug_printf_eval("entered %s()\n", __func__);
+
+- v1 = nvalloc(2);
++ tmpvars = nvalloc(2);
++#define TMPVAR0 (tmpvars)
++#define TMPVAR1 (tmpvars + 1)
+
+ while (op) {
+ struct {
+@@ -2578,48 +2884,35 @@ static var *evaluate(node *op, var *res)
+ op1 = op->l.n;
+ debug_printf_eval("opinfo:%08x opn:%08x\n", opinfo, opn);
+
+- /* "delete" is special:
+- * "delete array[var--]" must evaluate index expr only once,
+- * must not evaluate it in "execute inevitable things" part.
+- */
+- if (XC(opinfo & OPCLSMASK) == XC(OC_DELETE)) {
+- uint32_t info = op1->info & OPCLSMASK;
+- var *v;
+-
+- debug_printf_eval("DELETE\n");
+- if (info == OC_VAR) {
+- v = op1->l.v;
+- } else if (info == OC_FNARG) {
+- v = &fnargs[op1->l.aidx];
+- } else {
+- syntax_error(EMSG_NOT_ARRAY);
++ /* execute inevitable things */
++ if (opinfo & OF_RES1) {
++ if ((opinfo & OF_REQUIRED) && !op1)
++ syntax_error(EMSG_TOO_FEW_ARGS);
++ L.v = evaluate(op1, TMPVAR0);
++ if (opinfo & OF_STR1) {
++ L.s = getvar_s(L.v);
++ debug_printf_eval("L.s:'%s'\n", L.s);
+ }
+- if (op1->r.n) { /* array ref? */
+- const char *s;
+- s = getvar_s(evaluate(op1->r.n, v1));
+- hash_remove(iamarray(v), s);
+- } else {
+- clear_array(iamarray(v));
++ if (opinfo & OF_NUM1) {
++ L_d = getvar_i(L.v);
++ debug_printf_eval("L_d:%f\n", L_d);
+ }
+- goto next;
+ }
+-
+- /* execute inevitable things */
+- if (opinfo & OF_RES1)
+- L.v = evaluate(op1, v1);
+- if (opinfo & OF_RES2)
+- R.v = evaluate(op->r.n, v1+1);
+- if (opinfo & OF_STR1) {
+- L.s = getvar_s(L.v);
+- debug_printf_eval("L.s:'%s'\n", L.s);
+- }
+- if (opinfo & OF_STR2) {
+- R.s = getvar_s(R.v);
+- debug_printf_eval("R.s:'%s'\n", R.s);
+- }
+- if (opinfo & OF_NUM1) {
+- L_d = getvar_i(L.v);
+- debug_printf_eval("L_d:%f\n", L_d);
++ /* NB: Must get string/numeric values of L (done above)
++ * _before_ evaluate()'ing R.v: if both L and R are $NNNs,
++ * and right one is large, then L.v points to Fields[NNN1],
++ * second evaluate() reallocates and moves (!) Fields[],
++ * R.v points to Fields[NNN2] but L.v now points to freed mem!
++ * (Seen trying to evaluate "$444 $44444")
++ */
++ if (opinfo & OF_RES2) {
++ R.v = evaluate(op->r.n, TMPVAR1);
++ //TODO: L.v may be invalid now, set L.v to NULL to catch bugs?
++ //L.v = NULL;
++ if (opinfo & OF_STR2) {
++ R.s = getvar_s(R.v);
++ debug_printf_eval("R.s:'%s'\n", R.s);
++ }
+ }
+
+ debug_printf_eval("switch(0x%x)\n", XC(opinfo & OPCLSMASK));
+@@ -2629,7 +2922,8 @@ static var *evaluate(node *op, var *res)
+
+ /* test pattern */
+ case XC( OC_TEST ):
+- if ((op1->info & OPCLSMASK) == OC_COMMA) {
++ debug_printf_eval("TEST\n");
++ if (op1->info == TI_COMMA) {
+ /* it's range pattern */
+ if ((opinfo & OF_CHECKED) || ptest(op1->l.n)) {
+ op->info |= OF_CHECKED;
+@@ -2646,25 +2940,32 @@ static var *evaluate(node *op, var *res)
+
+ /* just evaluate an expression, also used as unconditional jump */
+ case XC( OC_EXEC ):
++ debug_printf_eval("EXEC\n");
+ break;
+
+ /* branch, used in if-else and various loops */
+ case XC( OC_BR ):
++ debug_printf_eval("BR\n");
+ op = istrue(L.v) ? op->a.n : op->r.n;
+ break;
+
+ /* initialize for-in loop */
+ case XC( OC_WALKINIT ):
++ debug_printf_eval("WALKINIT\n");
+ hashwalk_init(L.v, iamarray(R.v));
+ break;
+
+ /* get next array item */
+ case XC( OC_WALKNEXT ):
++ debug_printf_eval("WALKNEXT\n");
+ op = hashwalk_next(L.v) ? op->a.n : op->r.n;
+ break;
+
+ case XC( OC_PRINT ):
+- case XC( OC_PRINTF ): {
++ debug_printf_eval("PRINT /\n");
++ case XC( OC_PRINTF ):
++ debug_printf_eval("PRINTF\n");
++ {
+ FILE *F = stdout;
+
+ if (op->r.n) {
+@@ -2682,55 +2983,94 @@ static var *evaluate(node *op, var *res)
+ F = rsm->F;
+ }
+
++ /* Can't just check 'opinfo == OC_PRINT' here, parser ORs
++ * additional bits to opinfos of print/printf with redirects
++ */
+ if ((opinfo & OPCLSMASK) == OC_PRINT) {
+ if (!op1) {
+ fputs(getvar_s(intvar[F0]), F);
+ } else {
+- while (op1) {
+- var *v = evaluate(nextarg(&op1), v1);
++ for (;;) {
++ var *v = evaluate(nextarg(&op1), TMPVAR0);
+ if (v->type & VF_NUMBER) {
+- fmt_num(g_buf, MAXVARFMT, getvar_s(intvar[OFMT]),
+- getvar_i(v), TRUE);
++ fmt_num(getvar_s(intvar[OFMT]),
++ getvar_i(v));
+ fputs(g_buf, F);
+ } else {
+ fputs(getvar_s(v), F);
+ }
+-
+- if (op1)
+- fputs(getvar_s(intvar[OFS]), F);
++ if (!op1)
++ break;
++ fputs(getvar_s(intvar[OFS]), F);
+ }
+ }
+ fputs(getvar_s(intvar[ORS]), F);
+-
+- } else { /* OC_PRINTF */
+- char *s = awk_printf(op1);
++ } else { /* PRINTF */
++ IF_FEATURE_AWK_GNU_EXTENSIONS(size_t len;)
++ char *s = awk_printf(op1, &len);
++#if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
++ fwrite(s, len, 1, F);
++#else
+ fputs(s, F);
++#endif
+ free(s);
+ }
+ fflush(F);
+ break;
+ }
+
+- /* case XC( OC_DELETE ): - moved to happen before arg evaluation */
++ case XC( OC_DELETE ):
++ debug_printf_eval("DELETE\n");
++ {
++ /* "delete" is special:
++ * "delete array[var--]" must evaluate index expr only once.
++ */
++ uint32_t info = op1->info & OPCLSMASK;
++ var *v;
++
++ if (info == OC_VAR) {
++ v = op1->l.v;
++ } else if (info == OC_FNARG) {
++ v = &fnargs[op1->l.aidx];
++ } else {
++ syntax_error(EMSG_NOT_ARRAY);
++ }
++ if (op1->r.n) { /* array ref? */
++ const char *s;
++ s = getvar_s(evaluate(op1->r.n, TMPVAR0));
++ hash_remove(iamarray(v), s);
++ } else {
++ clear_array(iamarray(v));
++ }
++ break;
++ }
+
+ case XC( OC_NEWSOURCE ):
++ debug_printf_eval("NEWSOURCE\n");
+ g_progname = op->l.new_progname;
+ break;
+
+ case XC( OC_RETURN ):
++ debug_printf_eval("RETURN\n");
+ copyvar(res, L.v);
+ break;
+
+ case XC( OC_NEXTFILE ):
++ debug_printf_eval("NEXTFILE\n");
+ nextfile = TRUE;
+ case XC( OC_NEXT ):
++ debug_printf_eval("NEXT\n");
+ nextrec = TRUE;
+ case XC( OC_DONE ):
++ debug_printf_eval("DONE\n");
+ clrvar(res);
+ break;
+
+ case XC( OC_EXIT ):
+- awk_exit(L_d);
++ debug_printf_eval("EXIT\n");
++ if (op1)
++ G.exitcode = (int)L_d;
++ awk_exit();
+
+ /* -- recursive node type -- */
+
+@@ -2749,15 +3089,18 @@ static var *evaluate(node *op, var *res)
+ break;
+
+ case XC( OC_IN ):
++ debug_printf_eval("IN\n");
+ setvar_i(res, hash_search(iamarray(R.v), L.s) ? 1 : 0);
+ break;
+
+ case XC( OC_REGEXP ):
++ debug_printf_eval("REGEXP\n");
+ op1 = op;
+ L.s = getvar_s(intvar[F0]);
+ goto re_cont;
+
+ case XC( OC_MATCH ):
++ debug_printf_eval("MATCH\n");
+ op1 = op->r.n;
+ re_cont:
+ {
+@@ -2772,61 +3115,80 @@ static var *evaluate(node *op, var *res)
+ case XC( OC_MOVE ):
+ debug_printf_eval("MOVE\n");
+ /* if source is a temporary string, jusk relink it to dest */
+-//Disabled: if R.v is numeric but happens to have cached R.v->string,
+-//then L.v ends up being a string, which is wrong
+-// if (R.v == v1+1 && R.v->string) {
+-// res = setvar_p(L.v, R.v->string);
+-// R.v->string = NULL;
+-// } else {
++ if (R.v == TMPVAR1
++ && !(R.v->type & VF_NUMBER)
++ /* Why check !NUMBER? if R.v is a number but has cached R.v->string,
++ * L.v ends up a string, which is wrong */
++ /*&& R.v->string - always not NULL (right?) */
++ ) {
++ res = setvar_p(L.v, R.v->string); /* avoids strdup */
++ R.v->string = NULL;
++ } else {
+ res = copyvar(L.v, R.v);
+-// }
++ }
+ break;
+
+ case XC( OC_TERNARY ):
+- if ((op->r.n->info & OPCLSMASK) != OC_COLON)
++ debug_printf_eval("TERNARY\n");
++ if (op->r.n->info != TI_COLON)
+ syntax_error(EMSG_POSSIBLE_ERROR);
+ res = evaluate(istrue(L.v) ? op->r.n->l.n : op->r.n->r.n, res);
+ break;
+
+ case XC( OC_FUNC ): {
+- var *vbeg, *v;
++ var *argvars, *sv_fnargs;
+ const char *sv_progname;
++ int nargs, i;
+
+- /* The body might be empty, still has to eval the args */
+- if (!op->r.n->info && !op->r.f->body.first)
++ debug_printf_eval("FUNC\n");
++
++ if (!op->r.f->defined)
+ syntax_error(EMSG_UNDEF_FUNC);
+
+- vbeg = v = nvalloc(op->r.f->nargs + 1);
++ /* The body might be empty, still has to eval the args */
++ nargs = op->r.f->nargs;
++ argvars = nvalloc(nargs);
++ i = 0;
+ while (op1) {
+- var *arg = evaluate(nextarg(&op1), v1);
+- copyvar(v, arg);
+- v->type |= VF_CHILD;
+- v->x.parent = arg;
+- if (++v - vbeg >= op->r.f->nargs)
+- break;
++ var *arg = evaluate(nextarg(&op1), TMPVAR0);
++ if (i == nargs) {
++ /* call with more arguments than function takes.
++ * (gawk warns: "warning: function 'f' called with more arguments than declared").
++ * They are still evaluated, but discarded: */
++ clrvar(arg);
++ continue;
++ }
++ copyvar(&argvars[i], arg);
++ argvars[i].type |= VF_CHILD;
++ argvars[i].x.parent = arg;
++ i++;
+ }
+
+- v = fnargs;
+- fnargs = vbeg;
++ sv_fnargs = fnargs;
+ sv_progname = g_progname;
+
++ fnargs = argvars;
+ res = evaluate(op->r.f->body.first, res);
++ nvfree(argvars, nargs);
+
+ g_progname = sv_progname;
+- nvfree(fnargs);
+- fnargs = v;
++ fnargs = sv_fnargs;
+
+ break;
+ }
+
+ case XC( OC_GETLINE ):
+- case XC( OC_PGETLINE ): {
++ debug_printf_eval("GETLINE /\n");
++ case XC( OC_PGETLINE ):
++ debug_printf_eval("PGETLINE\n");
++ {
+ rstream *rsm;
+ int i;
+
+ if (op1) {
+ rsm = newfile(L.s);
+ if (!rsm->F) {
++ /* NB: can't use "opinfo == TI_PGETLINE", would break "cmd" | getline */
+ if ((opinfo & OPCLSMASK) == OC_PGETLINE) {
+ rsm->F = popen(L.s, "r");
+ rsm->is_pipe = TRUE;
+@@ -2861,16 +3223,34 @@ static var *evaluate(node *op, var *res)
+ /* simple builtins */
+ case XC( OC_FBLTIN ): {
+ double R_d = R_d; /* for compiler */
++ debug_printf_eval("FBLTIN\n");
++
++ if (op1 && op1->info == TI_COMMA)
++ /* Simple builtins take one arg maximum */
++ syntax_error("Too many arguments");
+
+ switch (opn) {
+ case F_in:
+ R_d = (long long)L_d;
+ break;
+
+- case F_rn:
+- R_d = (double)rand() / (double)RAND_MAX;
++ case F_rn: /*rand*/
++ if (op1)
++ syntax_error("Too many arguments");
++ {
++#if RAND_MAX >= 0x7fffffff
++ uint32_t u = ((uint32_t)rand() << 16) ^ rand();
++ uint64_t v = ((uint64_t)rand() << 32) | u;
++ /* the above shift+or is optimized out on 32-bit arches */
++# if RAND_MAX > 0x7fffffff
++ v &= 0x7fffffffffffffffULL;
++# endif
++ R_d = (double)v / 0x8000000000000000ULL;
++#else
++# error Not implemented for this value of RAND_MAX
++#endif
+ break;
+-
++ }
+ case F_co:
+ if (ENABLE_FEATURE_AWK_LIBM) {
+ R_d = cos(L_d);
+@@ -2910,7 +3290,9 @@ static var *evaluate(node *op, var *res)
+ srand(seed);
+ break;
+
+- case F_ti:
++ case F_ti: /*systime*/
++ if (op1)
++ syntax_error("Too many arguments");
+ R_d = time(NULL);
+ break;
+
+@@ -2949,7 +3331,7 @@ static var *evaluate(node *op, var *res)
+ rstream *rsm;
+ int err = 0;
+ rsm = (rstream *)hash_search(fdhash, L.s);
+- debug_printf_eval("OC_FBLTIN F_cl rsm:%p\n", rsm);
++ debug_printf_eval("OC_FBLTIN close: op1:%p s:'%s' rsm:%p\n", op1, L.s, rsm);
+ if (rsm) {
+ debug_printf_eval("OC_FBLTIN F_cl "
+ "rsm->is_pipe:%d, ->F:%p\n",
+@@ -2960,6 +3342,11 @@ static var *evaluate(node *op, var *res)
+ */
+ if (rsm->F)
+ err = rsm->is_pipe ? pclose(rsm->F) : fclose(rsm->F);
++//TODO: fix this case:
++// $ awk 'BEGIN { print close(""); print ERRNO }'
++// -1
++// close of redirection that was never opened
++// (we print 0, 0)
+ free(rsm->buffer);
+ hash_remove(fdhash, L.s);
+ }
+@@ -2974,14 +3361,18 @@ static var *evaluate(node *op, var *res)
+ }
+
+ case XC( OC_BUILTIN ):
++ debug_printf_eval("BUILTIN\n");
+ res = exec_builtin(op, res);
+ break;
+
+ case XC( OC_SPRINTF ):
+- setvar_p(res, awk_printf(op1));
++ debug_printf_eval("SPRINTF\n");
++ setvar_p(res, awk_printf(op1, NULL));
+ break;
+
+- case XC( OC_UNARY ): {
++ case XC( OC_UNARY ):
++ debug_printf_eval("UNARY\n");
++ {
+ double Ld, R_d;
+
+ Ld = R_d = getvar_i(R.v);
+@@ -3011,7 +3402,9 @@ static var *evaluate(node *op, var *res)
+ break;
+ }
+
+- case XC( OC_FIELD ): {
++ case XC( OC_FIELD ):
++ debug_printf_eval("FIELD\n");
++ {
+ int i = (int)getvar_i(R.v);
+ if (i < 0)
+ syntax_error(EMSG_NEGATIVE_FIELD);
+@@ -3028,26 +3421,33 @@ static var *evaluate(node *op, var *res)
+
+ /* concatenation (" ") and index joining (",") */
+ case XC( OC_CONCAT ):
++ debug_printf_eval("CONCAT /\n");
+ case XC( OC_COMMA ): {
+ const char *sep = "";
+- if ((opinfo & OPCLSMASK) == OC_COMMA)
++ debug_printf_eval("COMMA\n");
++ if (opinfo == TI_COMMA)
+ sep = getvar_s(intvar[SUBSEP]);
+ setvar_p(res, xasprintf("%s%s%s", L.s, sep, R.s));
+ break;
+ }
+
+ case XC( OC_LAND ):
++ debug_printf_eval("LAND\n");
+ setvar_i(res, istrue(L.v) ? ptest(op->r.n) : 0);
+ break;
+
+ case XC( OC_LOR ):
++ debug_printf_eval("LOR\n");
+ setvar_i(res, istrue(L.v) ? 1 : ptest(op->r.n));
+ break;
+
+ case XC( OC_BINARY ):
+- case XC( OC_REPLACE ): {
++ debug_printf_eval("BINARY /\n");
++ case XC( OC_REPLACE ):
++ debug_printf_eval("REPLACE\n");
++ {
+ double R_d = getvar_i(R.v);
+- debug_printf_eval("BINARY/REPLACE: R_d:%f opn:%c\n", R_d, opn);
++ debug_printf_eval("R_d:%f opn:%c\n", R_d, opn);
+ switch (opn) {
+ case '+':
+ L_d += R_d;
+@@ -3083,6 +3483,7 @@ static var *evaluate(node *op, var *res)
+ case XC( OC_COMPARE ): {
+ int i = i; /* for compiler */
+ double Ld;
++ debug_printf_eval("COMPARE\n");
+
+ if (is_numeric(L.v) && is_numeric(R.v)) {
+ Ld = getvar_i(L.v) - getvar_i(R.v);
+@@ -3109,7 +3510,7 @@ static var *evaluate(node *op, var *res)
+ default:
+ syntax_error(EMSG_POSSIBLE_ERROR);
+ } /* switch */
+- next:
++
+ if ((opinfo & OPCLSMASK) <= SHIFT_TIL_THIS)
+ op = op->a.n;
+ if ((opinfo & OPCLSMASK) >= RECUR_FROM_THIS)
+@@ -3118,7 +3519,10 @@ static var *evaluate(node *op, var *res)
+ break;
+ } /* while (op) */
+
+- nvfree(v1);
++ nvfree(tmpvars, 2);
++#undef TMPVAR0
++#undef TMPVAR1
++
+ debug_printf_eval("returning from %s(): %p\n", __func__, res);
+ return res;
+ #undef fnargs
+@@ -3126,25 +3530,21 @@ static var *evaluate(node *op, var *res)
+ #undef sreg
+ }
+
+-
+ /* -------- main & co. -------- */
+
+-static int awk_exit(int r)
++static int awk_exit(void)
+ {
+- var tv;
+ unsigned i;
+- hash_item *hi;
+-
+- zero_out_var(&tv);
+
+ if (!exiting) {
+ exiting = TRUE;
+ nextrec = FALSE;
+- evaluate(endseq.first, &tv);
++ evaluate(endseq.first, &G.exit__tmpvar);
+ }
+
+ /* waiting for children */
+ for (i = 0; i < fdhash->csize; i++) {
++ hash_item *hi;
+ hi = fdhash->items[i];
+ while (hi) {
+ if (hi->data.rs.F && hi->data.rs.is_pipe)
+@@ -3153,65 +3553,7 @@ static int awk_exit(int r)
+ }
+ }
+
+- exit(r);
+-}
+-
+-/* if expr looks like "var=value", perform assignment and return 1,
+- * otherwise return 0 */
+-static int is_assignment(const char *expr)
+-{
+- char *exprc, *val;
+-
+- if (!isalnum_(*expr) || (val = strchr(expr, '=')) == NULL) {
+- return FALSE;
+- }
+-
+- exprc = xstrdup(expr);
+- val = exprc + (val - expr);
+- *val++ = '\0';
+-
+- unescape_string_in_place(val);
+- setvar_u(newvar(exprc), val);
+- free(exprc);
+- return TRUE;
+-}
+-
+-/* switch to next input file */
+-static rstream *next_input_file(void)
+-{
+-#define rsm (G.next_input_file__rsm)
+-#define files_happen (G.next_input_file__files_happen)
+-
+- FILE *F;
+- const char *fname, *ind;
+-
+- if (rsm.F)
+- fclose(rsm.F);
+- rsm.F = NULL;
+- rsm.pos = rsm.adv = 0;
+-
+- for (;;) {
+- if (getvar_i(intvar[ARGIND])+1 >= getvar_i(intvar[ARGC])) {
+- if (files_happen)
+- return NULL;
+- fname = "-";
+- F = stdin;
+- break;
+- }
+- ind = getvar_s(incvar(intvar[ARGIND]));
+- fname = getvar_s(findvar(iamarray(intvar[ARGV]), ind));
+- if (fname && *fname && !is_assignment(fname)) {
+- F = xfopen_stdin(fname);
+- break;
+- }
+- }
+-
+- files_happen = TRUE;
+- setvar_s(intvar[FILENAME], fname);
+- rsm.F = F;
+- return &rsm;
+-#undef rsm
+-#undef files_happen
++ exit(G.exitcode);
+ }
+
+ int awk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+@@ -3224,12 +3566,7 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ #if ENABLE_FEATURE_AWK_GNU_EXTENSIONS
+ llist_t *list_e = NULL;
+ #endif
+- int i, j;
+- var *v;
+- var tv;
+- char **envp;
+- char *vnames = (char *)vNames; /* cheat */
+- char *vvalues = (char *)vValues;
++ int i;
+
+ INIT_G();
+
+@@ -3238,48 +3575,43 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ if (ENABLE_LOCALE_SUPPORT)
+ setlocale(LC_NUMERIC, "C");
+
+- zero_out_var(&tv);
+-
+- /* allocate global buffer */
+- g_buf = xmalloc(MAXVARFMT + 1);
+-
+- vhash = hash_init();
+- ahash = hash_init();
+- fdhash = hash_init();
+- fnhash = hash_init();
+-
+ /* initialize variables */
+- for (i = 0; *vnames; i++) {
+- intvar[i] = v = newvar(nextword(&vnames));
+- if (*vvalues != '\377')
+- setvar_s(v, nextword(&vvalues));
+- else
+- setvar_i(v, 0);
+-
+- if (*vnames == '*') {
+- v->type |= VF_SPECIAL;
+- vnames++;
++ vhash = hash_init();
++ {
++ char *vnames = (char *)vNames; /* cheat */
++ char *vvalues = (char *)vValues;
++ for (i = 0; *vnames; i++) {
++ var *v;
++ intvar[i] = v = newvar(nextword(&vnames));
++ if (*vvalues != '\377')
++ setvar_s(v, nextword(&vvalues));
++ else
++ setvar_i(v, 0);
++
++ if (*vnames == '*') {
++ v->type |= VF_SPECIAL;
++ vnames++;
++ }
+ }
+ }
+
+ handle_special(intvar[FS]);
+ handle_special(intvar[RS]);
+
+- newfile("/dev/stdin")->F = stdin;
+- newfile("/dev/stdout")->F = stdout;
+- newfile("/dev/stderr")->F = stderr;
+-
+ /* Huh, people report that sometimes environ is NULL. Oh well. */
+- if (environ) for (envp = environ; *envp; envp++) {
+- /* environ is writable, thus we don't strdup it needlessly */
+- char *s = *envp;
+- char *s1 = strchr(s, '=');
+- if (s1) {
+- *s1 = '\0';
+- /* Both findvar and setvar_u take const char*
+- * as 2nd arg -> environment is not trashed */
+- setvar_u(findvar(iamarray(intvar[ENVIRON]), s), s1 + 1);
+- *s1 = '=';
++ if (environ) {
++ char **envp;
++ for (envp = environ; *envp; envp++) {
++ /* environ is writable, thus we don't strdup it needlessly */
++ char *s = *envp;
++ char *s1 = strchr(s, '=');
++ if (s1) {
++ *s1 = '\0';
++ /* Both findvar and setvar_u take const char*
++ * as 2nd arg -> environment is not trashed */
++ setvar_u(findvar(iamarray(intvar[ENVIRON]), s), s1 + 1);
++ *s1 = '=';
++ }
+ }
+ }
+ opt = getopt32(argv, OPTSTR_AWK, &opt_F, &list_v, &list_f, IF_FEATURE_AWK_GNU_EXTENSIONS(&list_e,) NULL);
+@@ -3295,20 +3627,19 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ if (!is_assignment(llist_pop(&list_v)))
+ bb_show_usage();
+ }
++
++ /* Parse all supplied programs */
++ fnhash = hash_init();
++ ahash = hash_init();
+ while (list_f) {
+- char *s = NULL;
+- FILE *from_file;
++ int fd;
++ char *s;
+
+ g_progname = llist_pop(&list_f);
+- from_file = xfopen_stdin(g_progname);
+- /* one byte is reserved for some trick in next_token */
+- for (i = j = 1; j > 0; i += j) {
+- s = xrealloc(s, i + 4096);
+- j = fread(s + i, 1, 4094, from_file);
+- }
+- s[i] = '\0';
+- fclose(from_file);
+- parse_program(s + 1);
++ fd = xopen_stdin(g_progname);
++ s = xmalloc_read(fd, NULL); /* it's NUL-terminated */
++ close(fd);
++ parse_program(s);
+ free(s);
+ }
+ g_progname = "cmd. line";
+@@ -3317,11 +3648,23 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ parse_program(llist_pop(&list_e));
+ }
+ #endif
++//FIXME: preserve order of -e and -f
++//TODO: implement -i LIBRARY and -E FILE too, they are easy-ish
+ if (!(opt & (OPT_f | OPT_e))) {
+ if (!*argv)
+ bb_show_usage();
+ parse_program(*argv++);
+ }
++ /* Free unused parse structures */
++ //hash_free(fnhash); // ~250 bytes when empty, used only for function names
++ //^^^^^^^^^^^^^^^^^ does not work, hash_clear() inside SEGVs
++ // (IOW: hash_clear() assumes it's a hash of variables. fnhash is not).
++ free(fnhash->items);
++ free(fnhash);
++ fnhash = NULL; // debug
++ //hash_free(ahash); // empty after parsing, will reuse as fdhash instead of freeing
++
++ /* Parsing done, on to executing */
+
+ /* fill in ARGV array */
+ setari_u(intvar[ARGV], 0, "awk");
+@@ -3330,9 +3673,14 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ setari_u(intvar[ARGV], ++i, *argv++);
+ setvar_i(intvar[ARGC], i + 1);
+
+- evaluate(beginseq.first, &tv);
++ //fdhash = ahash; // done via define
++ newfile("/dev/stdin")->F = stdin;
++ newfile("/dev/stdout")->F = stdout;
++ newfile("/dev/stderr")->F = stderr;
++
++ evaluate(beginseq.first, &G.main__tmpvar);
+ if (!mainseq.first && !endseq.first)
+- awk_exit(EXIT_SUCCESS);
++ awk_exit();
+
+ /* input file could already be opened in BEGIN block */
+ if (!iF)
+@@ -3347,7 +3695,7 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ nextrec = FALSE;
+ incvar(intvar[NR]);
+ incvar(intvar[FNR]);
+- evaluate(mainseq.first, &tv);
++ evaluate(mainseq.first, &G.main__tmpvar);
+
+ if (nextfile)
+ break;
+@@ -3359,6 +3707,6 @@ int awk_main(int argc UNUSED_PARAM, char **argv)
+ iF = next_input_file();
+ }
+
+- awk_exit(EXIT_SUCCESS);
++ awk_exit();
+ /*return 0;*/
+ }
+diff --git a/testsuite/awk.tests b/testsuite/awk.tests
+index 92c83d719..4a7a01245 100755
+--- a/testsuite/awk.tests
++++ b/testsuite/awk.tests
+@@ -44,6 +44,16 @@ testing "awk handles empty function f(arg){}" \
+ "L1\n\nL2\n\n" \
+ "" ""
+
++prg='
++function empty_fun(){}
++END {empty_fun()
++ print "Ok"
++}'
++testing "awk handles empty function f(){}" \
++ "awk '$prg'" \
++ "Ok\n" \
++ "" ""
++
+ prg='
+ function outer_fun() {
+ return 1
+@@ -71,6 +81,23 @@ testing "awk properly handles undefined function" \
+ "L1\n\nawk: cmd. line:5: Call to undefined function\n" \
+ "" ""
+
++prg='
++BEGIN {
++ v=1
++ a=2
++ print v (a)
++}'
++testing "awk 'v (a)' is not a function call, it is a concatenation" \
++ "awk '$prg' 2>&1" \
++ "12\n" \
++ "" ""
++
++prg='func f(){print"F"};func g(){print"G"};BEGIN{f(g(),g())}'
++testing "awk unused function args are evaluated" \
++ "awk '$prg' 2>&1" \
++ "G\nG\nF\n" \
++ "" ""
++
+
+ optional DESKTOP
+ testing "awk hex const 1" "awk '{ print or(0xffffffff,1) }'" "4294967295\n" "" "\n"
+@@ -352,19 +379,14 @@ testing "awk -e and ARGC" \
+ ""
+ SKIP=
+
+-# The examples are in fact not valid awk programs (break/continue
+-# can only be used inside loops).
+-# But we do accept them outside of loops.
+-# We had a bug with misparsing "break ; else" sequence.
+-# Test that *that* bug is fixed, using simplest possible scripts:
+ testing "awk break" \
+ "awk -f - 2>&1; echo \$?" \
+- "0\n" \
++ "awk: -:1: 'break' not in a loop\n1\n" \
+ "" \
+ 'BEGIN { if (1) break; else a = 1 }'
+ testing "awk continue" \
+ "awk -f - 2>&1; echo \$?" \
+- "0\n" \
++ "awk: -:1: 'continue' not in a loop\n1\n" \
+ "" \
+ 'BEGIN { if (1) continue; else a = 1 }'
+
+@@ -383,6 +405,11 @@ testing "awk errors on missing delete arg" \
+ "awk -e '{delete}' 2>&1" "awk: cmd. line:1: Too few arguments\n" "" ""
+ SKIP=
+
++optional FEATURE_AWK_GNU_EXTENSIONS
++testing "awk printf('%c') can output NUL" \
++ "awk '{printf(\"hello%c null\n\", 0)}'" "hello\0 null\n" "" "\n"
++SKIP=
++
+ # testing "description" "command" "result" "infile" "stdin"
+ testing 'awk negative field access' \
+ 'awk 2>&1 -- '\''{ $(-1) }'\' \
+@@ -413,4 +440,25 @@ testing 'awk $NF is empty' \
+ '' \
+ 'a=====123='
+
++testing "awk exit N propagates through END's exit" \
++ "awk 'BEGIN { exit 42 } END { exit }'; echo \$?" \
++ "42\n" \
++ '' ''
++
++testing "awk print + redirect" \
++ "awk 'BEGIN { print \"STDERR %s\" >\"/dev/stderr\" }' 2>&1" \
++ "STDERR %s\n" \
++ '' ''
++
++testing "awk \"cmd\" | getline" \
++ "awk 'BEGIN { \"echo HELLO\" | getline; print }'" \
++ "HELLO\n" \
++ '' ''
++
++# printf %% should print one % (had a bug where it didn't)
++testing 'awk printf %% prints one %' \
++ "awk 'BEGIN { printf \"%%\n\" }'" \
++ "%\n" \
++ '' ''
++
+ exit $FAILCOUNT
+diff --git a/testsuite/printf.tests b/testsuite/printf.tests
+index 34a65926e..050edef71 100755
+--- a/testsuite/printf.tests
++++ b/testsuite/printf.tests
+@@ -79,6 +79,11 @@ testing "printf understands %Ld" \
+ "-5\n""0\n" \
+ "" ""
+
++testing "printf understands %%" \
++ "${bb}printf '%%\n' 2>&1; echo \$?" \
++ "%\n""0\n" \
++ "" ""
++
+ testing "printf handles positive numbers for %d" \
+ "${bb}printf '%d\n' 3 +3 ' 3' ' +3' 2>&1; echo \$?" \
+ "3\n"\
+--
+2.33.0
+
diff --git a/meta/recipes-core/busybox/busybox/0002-man-fix-segfault-in-man-1.patch b/meta/recipes-core/busybox/busybox/0002-man-fix-segfault-in-man-1.patch
new file mode 100644
index 0000000000..4a930b7b6f
--- /dev/null
+++ b/meta/recipes-core/busybox/busybox/0002-man-fix-segfault-in-man-1.patch
@@ -0,0 +1,30 @@
+From 4975cace9bf96bfde174f8bb5cc4068d2ea294d4 Mon Sep 17 00:00:00 2001
+From: Denys Vlasenko <vda.linux@googlemail.com>
+Date: Tue, 15 Jun 2021 14:47:46 +0200
+Subject: [PATCH] man: fix segfault in "man 1"
+
+function old new delta
+man_main 942 954 +12
+
+Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
+
+Upstream-Status: Backport [4d4fc5ca5ee4f]
+CVE: CVE-2021-42373
+Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
+---
+ miscutils/man.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/miscutils/man.c b/miscutils/man.c
+index 722f6641e..d319e8bba 100644
+--- a/miscutils/man.c
++++ b/miscutils/man.c
+@@ -324,7 +324,7 @@ int man_main(int argc UNUSED_PARAM, char **argv)
+
+ /* is 1st ARG a SECTION? */
+ sec_list = conf_sec_list;
+- if (is_section_name(conf_sec_list, *argv)) {
++ if (is_section_name(conf_sec_list, *argv) && argv[1]) {
+ /* yes */
+ sec_list = *argv++;
+ }
diff --git a/meta/recipes-core/busybox/busybox_1.33.2.bb b/meta/recipes-core/busybox/busybox_1.33.2.bb
index 44c83ab83c..4a0d3b4556 100644
--- a/meta/recipes-core/busybox/busybox_1.33.2.bb
+++ b/meta/recipes-core/busybox/busybox_1.33.2.bb
@@ -48,6 +48,8 @@ SRC_URI = "https://busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
file://0001-sysctl-ignore-EIO-of-stable_secret-below-proc-sys-ne.patch \
file://0001-gen_build_files-Use-C-locale-when-calling-sed-on-glo.patch \
file://0001-mktemp-add-tmpdir-option.patch \
+ file://0001-awk-fix-CVEs.patch \
+ file://0002-man-fix-segfault-in-man-1.patch \
"
SRC_URI_append_libc-musl = " file://musl.cfg "
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread