[PATCH 1/3] tools lib traceevent: Get rid of die() from pretty_print()

[PATCH 1/3] tools lib traceevent: Get rid of die() from pretty_print()

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

There are three cases that call die() in the pretty_print.

 1. insufficient number of argument: cannot proceed anymore.
 2. too long format conversion specifier: truncate and proceed.
 3. bad size specifier in format string: skip and proceed.

For all cases, convert die to do_warning, mark the event as
EVENT_FL_FAILED and print error message at the last.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/lib/traceevent/event-parse.c | 43 ++++++++++++++++++++++++++++----------
 1 file changed, 32 insertions(+), 11 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index b5b4d806ffa2..6d5e75987a3d 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -3889,8 +3889,11 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 				goto cont_process;
 			case '*':
 				/* The argument is the length. */
-				if (!arg)
-					die("no argument match");
+				if (!arg) {
+					do_warning("no argument match");
+					event->flags |= EVENT_FL_FAILED;
+					goto out_failed;
+				}
 				len_arg = eval_num_arg(data, size, event, arg);
 				len_as_arg = 1;
 				arg = arg->next;
@@ -3923,15 +3926,21 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 			case 'x':
 			case 'X':
 			case 'u':
-				if (!arg)
-					die("no argument match");
+				if (!arg) {
+					do_warning("no argument match");
+					event->flags |= EVENT_FL_FAILED;
+					goto out_failed;
+				}
 
 				len = ((unsigned long)ptr + 1) -
 					(unsigned long)saveptr;
 
 				/* should never happen */
-				if (len > 31)
-					die("bad format!");
+				if (len > 31) {
+					do_warning("bad format!");
+					event->flags |= EVENT_FL_FAILED;
+					len = 31;
+				}
 
 				memcpy(format, saveptr, len);
 				format[len] = 0;
@@ -3995,19 +4004,26 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 						trace_seq_printf(s, format, (long long)val);
 					break;
 				default:
-					die("bad count (%d)", ls);
+					do_warning("bad count (%d)", ls);
+					event->flags |= EVENT_FL_FAILED;
 				}
 				break;
 			case 's':
-				if (!arg)
-					die("no matching argument");
+				if (!arg) {
+					do_warning("no matching argument");
+					event->flags |= EVENT_FL_FAILED;
+					goto out_failed;
+				}
 
 				len = ((unsigned long)ptr + 1) -
 					(unsigned long)saveptr;
 
 				/* should never happen */
-				if (len > 31)
-					die("bad format!");
+				if (len > 31) {
+					do_warning("bad format!");
+					event->flags |= EVENT_FL_FAILED;
+					len = 31;
+				}
 
 				memcpy(format, saveptr, len);
 				format[len] = 0;
@@ -4025,6 +4041,11 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 			trace_seq_putc(s, *ptr);
 	}
 
+	if (event->flags & EVENT_FL_FAILED) {
+out_failed:
+		trace_seq_printf(s, "[FAILED TO PARSE]");
+	}
+
 	if (args) {
 		free_args(args);
 		free(bprint_fmt);
-- 
1.7.11.4

[PATCH 2/3] tools lib traceevent: Get rid of die() from pevent_register_event_handler

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

If memory allocation for handler fails, return gracefully instead of
calling die().  Note that casts to void * are needed because gcc
complained about discarding 'const' qualifier during implicit argument
cast.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/lib/traceevent/event-parse.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 6d5e75987a3d..17fd01d46e60 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5183,7 +5183,12 @@ int pevent_register_event_handler(struct pevent *pevent,
 
  not_found:
 	/* Save for later use. */
-	handle = malloc_or_die(sizeof(*handle));
+	handle = malloc(sizeof(*handle));
+	if (!handle) {
+		do_warning("Failed to allocate event handler");
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+	}
+
 	memset(handle, 0, sizeof(*handle));
 	handle->id = id;
 	if (event_name)
@@ -5193,7 +5198,11 @@ int pevent_register_event_handler(struct pevent *pevent,
 
 	if ((event_name && !handle->event_name) ||
 	    (sys_name && !handle->sys_name)) {
-		die("Failed to allocate event/sys name");
+		do_warning("Failed to allocate event/sys name");
+		free((void *)handle->event_name);
+		free((void *)handle->sys_name);
+		free(handle);
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
 	}
 
 	handle->func = func;
-- 
1.7.11.4

[PATCH 3/3] tools lib traceevent: Get rid of die() from pevent_register_print_function

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@lge.com>

If memory allocation for handler fails or argument type is not match,
return gracefully instead of calling die().  Also add an new error
code for the later case.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/lib/traceevent/event-parse.c | 26 ++++++++++++++++++++------
 tools/lib/traceevent/event-parse.h |  3 ++-
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 17fd01d46e60..4595aeb3c432 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5080,6 +5080,7 @@ int pevent_register_print_function(struct pevent *pevent,
 	struct pevent_func_params *param;
 	enum pevent_func_arg_type type;
 	va_list ap;
+	int ret;
 
 	func_handle = find_func_handler(pevent, name);
 	if (func_handle) {
@@ -5092,14 +5093,21 @@ int pevent_register_print_function(struct pevent *pevent,
 		remove_func_handler(pevent, name);
 	}
 
-	func_handle = malloc_or_die(sizeof(*func_handle));
+	func_handle = malloc(sizeof(*func_handle));
+	if (!func_handle) {
+		do_warning("Failed to allocate function handler");
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+	}
 	memset(func_handle, 0, sizeof(*func_handle));
 
 	func_handle->ret_type = ret_type;
 	func_handle->name = strdup(name);
 	func_handle->func = func;
-	if (!func_handle->name)
-		die("Failed to allocate function name");
+	if (!func_handle->name) {
+		do_warning("Failed to allocate function name");
+		free(func_handle);
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+	}
 
 	next_param = &(func_handle->params);
 	va_start(ap, name);
@@ -5109,11 +5117,17 @@ int pevent_register_print_function(struct pevent *pevent,
 			break;
 
 		if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
-			warning("Invalid argument type %d", type);
+			do_warning("Invalid argument type %d", type);
+			ret = PEVENT_ERRNO__INVALID_ARG_TYPE;
 			goto out_free;
 		}
 
-		param = malloc_or_die(sizeof(*param));
+		param = malloc(sizeof(*param));
+		if (!param) {
+			do_warning("Failed to allocate function param");
+			ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
+			goto out_free;
+		}
 		param->type = type;
 		param->next = NULL;
 
@@ -5131,7 +5145,7 @@ int pevent_register_print_function(struct pevent *pevent,
  out_free:
 	va_end(ap);
 	free_func_handle(func_handle);
-	return -1;
+	return ret;
 }
 
 /**
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 863a0bbda7f1..3318963f1c98 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -351,7 +351,8 @@ enum pevent_flag {
 	_PE(READ_ID_FAILED,	"failed to read event id"),		      \
 	_PE(READ_FORMAT_FAILED,	"failed to read event format"),		      \
 	_PE(READ_PRINT_FAILED,	"failed to read event print fmt"), 	      \
-	_PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace")
+	_PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),\
+	_PE(INVALID_ARG_TYPE,	"invalid argument type")
 
 #undef _PE
 #define _PE(__code, __str) PEVENT_ERRNO__ ## __code
-- 
1.7.11.4

Re: [PATCH 1/3] tools lib traceevent: Get rid of die() from pretty_print()

[Steven Rostedt]

On Fri, 2012-09-07 at 11:49 +0900, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@lge.com>
> 
> There are three cases that call die() in the pretty_print.
> 
>  1. insufficient number of argument: cannot proceed anymore.
>  2. too long format conversion specifier: truncate and proceed.
>  3. bad size specifier in format string: skip and proceed.
> 
> For all cases, convert die to do_warning, mark the event as
> EVENT_FL_FAILED and print error message at the last.
> 
> Cc: Frederic Weisbecker <fweisbec@gmail.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Thanks Namyung!

Arnaldo,

Please add my "Acked-by: Steven Rostedt <rostedt@goodmis.org>" to all
three of these patches.

-- Steve

[tip:perf/core] tools lib traceevent: Get rid of die() from pretty_print()

[tip-bot for Namhyung Kim]

Commit-ID:  245c5a18433090da0e1a799bdb0faa78552b5992
Gitweb:     http://git.kernel.org/tip/245c5a18433090da0e1a799bdb0faa78552b5992
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Fri, 7 Sep 2012 11:49:45 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 7 Sep 2012 12:14:30 -0300

tools lib traceevent: Get rid of die() from pretty_print()

There are three cases that call die() in the pretty_print.

 1. insufficient number of argument: cannot proceed anymore.
 2. too long format conversion specifier: truncate and proceed.
 3. bad size specifier in format string: skip and proceed.

For all cases, convert die to do_warning, mark the event as
EVENT_FL_FAILED and print error message at the last.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1346986187-5170-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/event-parse.c |   43 ++++++++++++++++++++++++++---------
 1 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index b5b4d80..6d5e759 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -3889,8 +3889,11 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 				goto cont_process;
 			case '*':
 				/* The argument is the length. */
-				if (!arg)
-					die("no argument match");
+				if (!arg) {
+					do_warning("no argument match");
+					event->flags |= EVENT_FL_FAILED;
+					goto out_failed;
+				}
 				len_arg = eval_num_arg(data, size, event, arg);
 				len_as_arg = 1;
 				arg = arg->next;
@@ -3923,15 +3926,21 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 			case 'x':
 			case 'X':
 			case 'u':
-				if (!arg)
-					die("no argument match");
+				if (!arg) {
+					do_warning("no argument match");
+					event->flags |= EVENT_FL_FAILED;
+					goto out_failed;
+				}
 
 				len = ((unsigned long)ptr + 1) -
 					(unsigned long)saveptr;
 
 				/* should never happen */
-				if (len > 31)
-					die("bad format!");
+				if (len > 31) {
+					do_warning("bad format!");
+					event->flags |= EVENT_FL_FAILED;
+					len = 31;
+				}
 
 				memcpy(format, saveptr, len);
 				format[len] = 0;
@@ -3995,19 +4004,26 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 						trace_seq_printf(s, format, (long long)val);
 					break;
 				default:
-					die("bad count (%d)", ls);
+					do_warning("bad count (%d)", ls);
+					event->flags |= EVENT_FL_FAILED;
 				}
 				break;
 			case 's':
-				if (!arg)
-					die("no matching argument");
+				if (!arg) {
+					do_warning("no matching argument");
+					event->flags |= EVENT_FL_FAILED;
+					goto out_failed;
+				}
 
 				len = ((unsigned long)ptr + 1) -
 					(unsigned long)saveptr;
 
 				/* should never happen */
-				if (len > 31)
-					die("bad format!");
+				if (len > 31) {
+					do_warning("bad format!");
+					event->flags |= EVENT_FL_FAILED;
+					len = 31;
+				}
 
 				memcpy(format, saveptr, len);
 				format[len] = 0;
@@ -4025,6 +4041,11 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
 			trace_seq_putc(s, *ptr);
 	}
 
+	if (event->flags & EVENT_FL_FAILED) {
+out_failed:
+		trace_seq_printf(s, "[FAILED TO PARSE]");
+	}
+
 	if (args) {
 		free_args(args);
 		free(bprint_fmt);

[tip:perf/core] tools lib traceevent: Get rid of die() from pevent_register_event_handler

[tip-bot for Namhyung Kim]

Commit-ID:  0ca8da00ad170c12c12350c3a2500591a7bec535
Gitweb:     http://git.kernel.org/tip/0ca8da00ad170c12c12350c3a2500591a7bec535
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Fri, 7 Sep 2012 11:49:46 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 7 Sep 2012 12:15:07 -0300

tools lib traceevent: Get rid of die() from pevent_register_event_handler

If memory allocation for handler fails, return gracefully instead of
calling die().  Note that casts to void * are needed because gcc
complained about discarding 'const' qualifier during implicit argument
cast.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1346986187-5170-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/event-parse.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 6d5e759..17fd01d 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5183,7 +5183,12 @@ int pevent_register_event_handler(struct pevent *pevent,
 
  not_found:
 	/* Save for later use. */
-	handle = malloc_or_die(sizeof(*handle));
+	handle = malloc(sizeof(*handle));
+	if (!handle) {
+		do_warning("Failed to allocate event handler");
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+	}
+
 	memset(handle, 0, sizeof(*handle));
 	handle->id = id;
 	if (event_name)
@@ -5193,7 +5198,11 @@ int pevent_register_event_handler(struct pevent *pevent,
 
 	if ((event_name && !handle->event_name) ||
 	    (sys_name && !handle->sys_name)) {
-		die("Failed to allocate event/sys name");
+		do_warning("Failed to allocate event/sys name");
+		free((void *)handle->event_name);
+		free((void *)handle->sys_name);
+		free(handle);
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
 	}
 
 	handle->func = func;

[tip:perf/core] tools lib traceevent: Get rid of die() from pevent_register_print_function

[tip-bot for Namhyung Kim]

Commit-ID:  67ed939c9eb029c28057eb75de456a9d0e899fd4
Gitweb:     http://git.kernel.org/tip/67ed939c9eb029c28057eb75de456a9d0e899fd4
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Fri, 7 Sep 2012 11:49:47 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 7 Sep 2012 12:15:31 -0300

tools lib traceevent: Get rid of die() from pevent_register_print_function

If memory allocation for handler fails or argument type is not match,
return gracefully instead of calling die().  Also add an new error code
for the later case.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1346986187-5170-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/event-parse.c |   26 ++++++++++++++++++++------
 tools/lib/traceevent/event-parse.h |    3 ++-
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 17fd01d..4595aeb 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5080,6 +5080,7 @@ int pevent_register_print_function(struct pevent *pevent,
 	struct pevent_func_params *param;
 	enum pevent_func_arg_type type;
 	va_list ap;
+	int ret;
 
 	func_handle = find_func_handler(pevent, name);
 	if (func_handle) {
@@ -5092,14 +5093,21 @@ int pevent_register_print_function(struct pevent *pevent,
 		remove_func_handler(pevent, name);
 	}
 
-	func_handle = malloc_or_die(sizeof(*func_handle));
+	func_handle = malloc(sizeof(*func_handle));
+	if (!func_handle) {
+		do_warning("Failed to allocate function handler");
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+	}
 	memset(func_handle, 0, sizeof(*func_handle));
 
 	func_handle->ret_type = ret_type;
 	func_handle->name = strdup(name);
 	func_handle->func = func;
-	if (!func_handle->name)
-		die("Failed to allocate function name");
+	if (!func_handle->name) {
+		do_warning("Failed to allocate function name");
+		free(func_handle);
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
+	}
 
 	next_param = &(func_handle->params);
 	va_start(ap, name);
@@ -5109,11 +5117,17 @@ int pevent_register_print_function(struct pevent *pevent,
 			break;
 
 		if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
-			warning("Invalid argument type %d", type);
+			do_warning("Invalid argument type %d", type);
+			ret = PEVENT_ERRNO__INVALID_ARG_TYPE;
 			goto out_free;
 		}
 
-		param = malloc_or_die(sizeof(*param));
+		param = malloc(sizeof(*param));
+		if (!param) {
+			do_warning("Failed to allocate function param");
+			ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
+			goto out_free;
+		}
 		param->type = type;
 		param->next = NULL;
 
@@ -5131,7 +5145,7 @@ int pevent_register_print_function(struct pevent *pevent,
  out_free:
 	va_end(ap);
 	free_func_handle(func_handle);
-	return -1;
+	return ret;
 }
 
 /**
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 863a0bb..3318963 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -351,7 +351,8 @@ enum pevent_flag {
 	_PE(READ_ID_FAILED,	"failed to read event id"),		      \
 	_PE(READ_FORMAT_FAILED,	"failed to read event format"),		      \
 	_PE(READ_PRINT_FAILED,	"failed to read event print fmt"), 	      \
-	_PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace")
+	_PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),\
+	_PE(INVALID_ARG_TYPE,	"invalid argument type")
 
 #undef _PE
 #define _PE(__code, __str) PEVENT_ERRNO__ ## __code