[Qemu-devel] [PULL 0/4] QAPI patches for 2017-05-31

[Qemu-devel] [PULL 0/4] QAPI patches for 2017-05-31

[Markus Armbruster]

The following changes since commit 0748b3526e8cb78b9cd64208426bfc3d54a72b04:

  Merge remote-tracking branch 'kwolf/tags/for-upstream' into staging (2017-05-30 14:15:15 +0100)

are available in the git repository at:

  git://repo.or.cz/qemu/armbru.git tags/pull-qapi-2017-05-31

for you to fetch changes up to c0644771ebedbd8f47f3c24816445e30111d226b:

  qapi: Reject alternates that can't work with keyval_parse() (2017-05-31 16:04:09 +0200)

----------------------------------------------------------------
QAPI patches for 2017-05-31

----------------------------------------------------------------
Markus Armbruster (4):
      qobject-input-visitor: Reject non-finite numbers with keyval
      qapi: Document visit_type_any() issues with keyval input
      tests/qapi-schema: Avoid 'str' in alternate test cases
      qapi: Reject alternates that can't work with keyval_parse()

 include/qapi/visitor.h                             |  4 ++
 qapi/qobject-input-visitor.c                       |  3 +-
 scripts/qapi.py                                    | 19 ++++++-
 tests/Makefile.include                             |  2 +
 tests/qapi-schema/alternate-clash.json             |  2 +-
 tests/qapi-schema/alternate-conflict-dict.json     |  2 +-
 tests/qapi-schema/alternate-conflict-enum-bool.err |  1 +
 .../qapi-schema/alternate-conflict-enum-bool.exit  |  1 +
 .../qapi-schema/alternate-conflict-enum-bool.json  |  6 +++
 tests/qapi-schema/alternate-conflict-enum-bool.out |  0
 tests/qapi-schema/alternate-conflict-enum-int.err  |  1 +
 tests/qapi-schema/alternate-conflict-enum-int.exit |  1 +
 tests/qapi-schema/alternate-conflict-enum-int.json |  6 +++
 tests/qapi-schema/alternate-conflict-enum-int.out  |  0
 tests/qapi-schema/alternate-conflict-string.err    |  2 +-
 tests/qapi-schema/alternate-conflict-string.json   |  6 +--
 tests/qapi-schema/alternate-nested.json            |  2 +-
 tests/qapi-schema/args-alternate.json              |  2 +-
 tests/qapi-schema/doc-bad-alternate-member.json    |  2 +-
 tests/qapi-schema/qapi-schema-test.json            | 13 +++--
 tests/qapi-schema/qapi-schema-test.out             | 34 ++++++------
 tests/qapi-schema/returns-alternate.json           |  2 +-
 tests/test-clone-visitor.c                         | 23 ++++----
 tests/test-keyval.c                                | 18 ++++---
 tests/test-qobject-input-visitor.c                 | 62 ++++++++++++----------
 tests/test-qobject-output-visitor.c                |  4 +-
 util/keyval.c                                      | 10 ++--
 27 files changed, 140 insertions(+), 88 deletions(-)
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.err
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.exit
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.json
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.out
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.err
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.exit
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.json
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.out

-- 
2.7.4

[Qemu-devel] [PULL 1/4] qobject-input-visitor: Reject non-finite numbers with keyval

[Markus Armbruster]

The QObject input visitor can produce only finite numbers when its
input comes out of the JSON parser, because the the JSON parser
implements RFC 7159, which provides no syntax for infinity and NaN.

However, it can produce infinity and NaN when its input comes out of
keyval_parse(), because we parse with strtod() then.

The keyval variant should not be able to express things the JSON
variant can't.  Rejecting non-finite numbers there is the conservative
fix.  It's also minimally invasive.

We could instead extend our JSON dialect to provide for infinity and
NaN.  Not today.

Note that the JSON formatter can emit non-finite numbers (marked FIXME
in commit 6e8e5cb).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1495471335-23707-2-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 qapi/qobject-input-visitor.c       | 3 ++-
 tests/test-qobject-input-visitor.c | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/qapi/qobject-input-visitor.c b/qapi/qobject-input-visitor.c
index d0f0002..eac40f6 100644
--- a/qapi/qobject-input-visitor.c
+++ b/qapi/qobject-input-visitor.c
@@ -13,6 +13,7 @@
  */
 
 #include "qemu/osdep.h"
+#include <math.h>
 #include "qapi/error.h"
 #include "qapi/qobject-input-visitor.h"
 #include "qapi/visitor-impl.h"
@@ -568,7 +569,7 @@ static void qobject_input_type_number_keyval(Visitor *v, const char *name,
 
     errno = 0;
     *obj = strtod(str, &endp);
-    if (errno || endp == str || *endp) {
+    if (errno || endp == str || *endp || !isfinite(*obj)) {
         /* TODO report -ERANGE more nicely */
         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                    full_name(qiv, name), "number");
diff --git a/tests/test-qobject-input-visitor.c b/tests/test-qobject-input-visitor.c
index f965743..e2aabbe 100644
--- a/tests/test-qobject-input-visitor.c
+++ b/tests/test-qobject-input-visitor.c
@@ -278,11 +278,17 @@ static void test_visitor_in_number_str_keyval(TestInputVisitorData *data,
 {
     double res = 0, value = 3.14;
     Visitor *v;
+    Error *err = NULL;
 
     v = visitor_input_test_init_full(data, true, "\"3.14\"");
 
     visit_type_number(v, NULL, &res, &error_abort);
     g_assert_cmpfloat(res, ==, value);
+
+    v = visitor_input_test_init_full(data, true, "\"inf\"");
+
+    visit_type_number(v, NULL, &res, &err);
+    error_free_or_abort(&err);
 }
 
 static void test_visitor_in_number_str_fail(TestInputVisitorData *data,
-- 
2.7.4

[Qemu-devel] [PULL 2/4] qapi: Document visit_type_any() issues with keyval input

[Markus Armbruster]

It's already documented in keyval.c (commit 0ee9ae7), but visitor.h
can use a note, too.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1495471335-23707-3-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 include/qapi/visitor.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index b0e233d..4721c39 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -607,6 +607,10 @@ void visit_type_number(Visitor *v, const char *name, double *obj,
  * @obj must be non-NULL.  Input visitors set *@obj to the value;
  * other visitors will leave *@obj unchanged.  *@obj must be non-NULL
  * for output visitors.
+ *
+ * Note that some kinds of input can't express arbitrary QObject.
+ * E.g. the visitor returned by qobject_input_visitor_new_keyval()
+ * can't create numbers or booleans, only strings.
  */
 void visit_type_any(Visitor *v, const char *name, QObject **obj, Error **errp);
 
-- 
2.7.4

[Qemu-devel] [PULL 3/4] tests/qapi-schema: Avoid 'str' in alternate test cases

[Markus Armbruster]

The next commit is going to make alternate members of type 'str'
conflict with other scalar types.  Would break a few test cases that
don't actually require 'str'.  Flip them from 'str' to 'bool' or
'EnumOne'.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1495471335-23707-4-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 tests/qapi-schema/alternate-clash.json          |  2 +-
 tests/qapi-schema/alternate-nested.json         |  2 +-
 tests/qapi-schema/args-alternate.json           |  2 +-
 tests/qapi-schema/doc-bad-alternate-member.json |  2 +-
 tests/qapi-schema/qapi-schema-test.json         |  9 ++--
 tests/qapi-schema/qapi-schema-test.out          | 30 +++++++------
 tests/qapi-schema/returns-alternate.json        |  2 +-
 tests/test-clone-visitor.c                      | 23 +++++-----
 tests/test-qobject-input-visitor.c              | 56 ++++++++++++-------------
 tests/test-qobject-output-visitor.c             |  4 +-
 10 files changed, 68 insertions(+), 64 deletions(-)

diff --git a/tests/qapi-schema/alternate-clash.json b/tests/qapi-schema/alternate-clash.json
index 6d73bc5..9a59b88 100644
--- a/tests/qapi-schema/alternate-clash.json
+++ b/tests/qapi-schema/alternate-clash.json
@@ -5,4 +5,4 @@
 # the implicit Alt1Kind enum, we would still have a collision with the
 # resulting C union trying to have two members named 'a_b'.
 { 'alternate': 'Alt1',
-  'data': { 'a-b': 'str', 'a_b': 'int' } }
+  'data': { 'a-b': 'bool', 'a_b': 'int' } }
diff --git a/tests/qapi-schema/alternate-nested.json b/tests/qapi-schema/alternate-nested.json
index 8e22186..f2b9632 100644
--- a/tests/qapi-schema/alternate-nested.json
+++ b/tests/qapi-schema/alternate-nested.json
@@ -1,5 +1,5 @@
 # we reject a nested alternate branch
 { 'alternate': 'Alt1',
-  'data': { 'name': 'str', 'value': 'int' } }
+  'data': { 'name': 'bool', 'value': 'int' } }
 { 'alternate': 'Alt2',
   'data': { 'nested': 'Alt1', 'b': 'bool' } }
diff --git a/tests/qapi-schema/args-alternate.json b/tests/qapi-schema/args-alternate.json
index 69e94d4..824d69c 100644
--- a/tests/qapi-schema/args-alternate.json
+++ b/tests/qapi-schema/args-alternate.json
@@ -1,3 +1,3 @@
 # we do not allow alternate arguments
-{ 'alternate': 'Alt', 'data': { 'case1': 'int', 'case2': 'str' } }
+{ 'alternate': 'Alt', 'data': { 'case1': 'int', 'case2': 'bool' } }
 { 'command': 'oops', 'data': 'Alt' }
diff --git a/tests/qapi-schema/doc-bad-alternate-member.json b/tests/qapi-schema/doc-bad-alternate-member.json
index 738635c..fa4143d 100644
--- a/tests/qapi-schema/doc-bad-alternate-member.json
+++ b/tests/qapi-schema/doc-bad-alternate-member.json
@@ -6,4 +6,4 @@
 # @bb: b
 ##
 { 'alternate': 'AorB',
-  'data': { 'a': 'str', 'b': 'int' } }
+  'data': { 'a': 'bool', 'b': 'int' } }
diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index 842ea3c..303f2b2 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -93,16 +93,17 @@
 { 'struct': 'WrapAlternate',
   'data': { 'alt': 'UserDefAlternate' } }
 { 'alternate': 'UserDefAlternate',
-  'data': { 'udfu': 'UserDefFlatUnion', 's': 'str', 'i': 'int' } }
+  'data': { 'udfu': 'UserDefFlatUnion', 'e': 'EnumOne', 'i': 'int' } }
 
 { 'struct': 'UserDefC',
   'data': { 'string1': 'str', 'string2': 'str' } }
 
 # for testing use of 'number' within alternates
-{ 'alternate': 'AltStrBool', 'data': { 's': 'str', 'b': 'bool' } }
-{ 'alternate': 'AltStrNum', 'data': { 's': 'str', 'n': 'number' } }
+{ 'alternate': 'AltEnumBool', 'data': { 'e': 'EnumOne', 'b': 'bool' } }
+{ 'alternate': 'AltEnumNum', 'data': { 'e': 'EnumOne', 'n': 'number' } }
 { 'alternate': 'AltNumStr', 'data': { 'n': 'number', 's': 'str' } }
-{ 'alternate': 'AltStrInt', 'data': { 's': 'str', 'i': 'int' } }
+{ 'alternate': 'AltNumEnum', 'data': { 'n': 'number', 'e': 'EnumOne' } }
+{ 'alternate': 'AltEnumInt', 'data': { 'e': 'EnumOne', 'i': 'int' } }
 { 'alternate': 'AltIntNum', 'data': { 'i': 'int', 'n': 'number' } }
 { 'alternate': 'AltNumInt', 'data': { 'n': 'number', 'i': 'int' } }
 
diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 9d99c4e..3081091 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -1,7 +1,23 @@
+alternate AltEnumBool
+    tag type
+    case e: EnumOne
+    case b: bool
+alternate AltEnumInt
+    tag type
+    case e: EnumOne
+    case i: int
+alternate AltEnumNum
+    tag type
+    case e: EnumOne
+    case n: number
 alternate AltIntNum
     tag type
     case i: int
     case n: number
+alternate AltNumEnum
+    tag type
+    case n: number
+    case e: EnumOne
 alternate AltNumInt
     tag type
     case n: number
@@ -10,18 +26,6 @@ alternate AltNumStr
     tag type
     case n: number
     case s: str
-alternate AltStrBool
-    tag type
-    case s: str
-    case b: bool
-alternate AltStrInt
-    tag type
-    case s: str
-    case i: int
-alternate AltStrNum
-    tag type
-    case s: str
-    case n: number
 event EVENT_A None
    boxed=False
 event EVENT_B None
@@ -66,7 +70,7 @@ object UserDefA
 alternate UserDefAlternate
     tag type
     case udfu: UserDefFlatUnion
-    case s: str
+    case e: EnumOne
     case i: int
 object UserDefB
     member intb: int optional=False
diff --git a/tests/qapi-schema/returns-alternate.json b/tests/qapi-schema/returns-alternate.json
index 972390c..f873718 100644
--- a/tests/qapi-schema/returns-alternate.json
+++ b/tests/qapi-schema/returns-alternate.json
@@ -1,3 +1,3 @@
 # we reject returns if it is an alternate type
-{ 'alternate': 'Alt', 'data': { 'a': 'int', 'b': 'str' } }
+{ 'alternate': 'Alt', 'data': { 'a': 'int', 'b': 'bool' } }
 { 'command': 'oops', 'returns': 'Alt' }
diff --git a/tests/test-clone-visitor.c b/tests/test-clone-visitor.c
index df0c045..9698216 100644
--- a/tests/test-clone-visitor.c
+++ b/tests/test-clone-visitor.c
@@ -42,29 +42,28 @@ static void test_clone_struct(void)
 
 static void test_clone_alternate(void)
 {
-    AltStrBool *b_src, *s_src, *b_dst, *s_dst;
+    AltEnumBool *b_src, *s_src, *b_dst, *s_dst;
 
-    b_src = g_new0(AltStrBool, 1);
+    b_src = g_new0(AltEnumBool, 1);
     b_src->type = QTYPE_QBOOL;
     b_src->u.b = true;
-    s_src = g_new0(AltStrBool, 1);
+    s_src = g_new0(AltEnumBool, 1);
     s_src->type = QTYPE_QSTRING;
-    s_src->u.s = g_strdup("World");
+    s_src->u.e = ENUM_ONE_VALUE1;
 
-    b_dst = QAPI_CLONE(AltStrBool, b_src);
+    b_dst = QAPI_CLONE(AltEnumBool, b_src);
     g_assert(b_dst);
     g_assert_cmpint(b_dst->type, ==, b_src->type);
     g_assert_cmpint(b_dst->u.b, ==, b_src->u.b);
-    s_dst = QAPI_CLONE(AltStrBool, s_src);
+    s_dst = QAPI_CLONE(AltEnumBool, s_src);
     g_assert(s_dst);
     g_assert_cmpint(s_dst->type, ==, s_src->type);
-    g_assert_cmpstr(s_dst->u.s, ==, s_src->u.s);
-    g_assert(s_dst->u.s != s_src->u.s);
+    g_assert_cmpint(s_dst->u.e, ==, s_src->u.e);
 
-    qapi_free_AltStrBool(b_src);
-    qapi_free_AltStrBool(s_src);
-    qapi_free_AltStrBool(b_dst);
-    qapi_free_AltStrBool(s_dst);
+    qapi_free_AltEnumBool(b_src);
+    qapi_free_AltEnumBool(s_src);
+    qapi_free_AltEnumBool(b_dst);
+    qapi_free_AltEnumBool(s_dst);
 }
 
 static void test_clone_native_list(void)
diff --git a/tests/test-qobject-input-visitor.c b/tests/test-qobject-input-visitor.c
index e2aabbe..6b997a1 100644
--- a/tests/test-qobject-input-visitor.c
+++ b/tests/test-qobject-input-visitor.c
@@ -537,10 +537,10 @@ static void test_visitor_in_alternate(TestInputVisitorData *data,
     g_assert_cmpint(tmp->u.i, ==, 42);
     qapi_free_UserDefAlternate(tmp);
 
-    v = visitor_input_test_init(data, "'string'");
+    v = visitor_input_test_init(data, "'value1'");
     visit_type_UserDefAlternate(v, NULL, &tmp, &error_abort);
     g_assert_cmpint(tmp->type, ==, QTYPE_QSTRING);
-    g_assert_cmpstr(tmp->u.s, ==, "string");
+    g_assert_cmpint(tmp->u.e, ==, ENUM_ONE_VALUE1);
     qapi_free_UserDefAlternate(tmp);
 
     v = visitor_input_test_init(data, "{'integer':1, 'string':'str', "
@@ -565,10 +565,10 @@ static void test_visitor_in_alternate(TestInputVisitorData *data,
     g_assert_cmpint(wrap->alt->u.i, ==, 42);
     qapi_free_WrapAlternate(wrap);
 
-    v = visitor_input_test_init(data, "{ 'alt': 'string' }");
+    v = visitor_input_test_init(data, "{ 'alt': 'value1' }");
     visit_type_WrapAlternate(v, NULL, &wrap, &error_abort);
     g_assert_cmpint(wrap->alt->type, ==, QTYPE_QSTRING);
-    g_assert_cmpstr(wrap->alt->u.s, ==, "string");
+    g_assert_cmpint(wrap->alt->u.e, ==, ENUM_ONE_VALUE1);
     qapi_free_WrapAlternate(wrap);
 
     v = visitor_input_test_init(data, "{ 'alt': {'integer':1, 'string':'str', "
@@ -588,37 +588,37 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,
 {
     Visitor *v;
     Error *err = NULL;
-    AltStrBool *asb;
-    AltStrNum *asn;
-    AltNumStr *ans;
-    AltStrInt *asi;
+    AltEnumBool *aeb;
+    AltEnumNum *aen;
+    AltNumEnum *ans;
+    AltEnumInt *asi;
     AltIntNum *ain;
     AltNumInt *ani;
 
     /* Parsing an int */
 
     v = visitor_input_test_init(data, "42");
-    visit_type_AltStrBool(v, NULL, &asb, &err);
+    visit_type_AltEnumBool(v, NULL, &aeb, &err);
     error_free_or_abort(&err);
-    qapi_free_AltStrBool(asb);
+    qapi_free_AltEnumBool(aeb);
 
     v = visitor_input_test_init(data, "42");
-    visit_type_AltStrNum(v, NULL, &asn, &error_abort);
-    g_assert_cmpint(asn->type, ==, QTYPE_QFLOAT);
-    g_assert_cmpfloat(asn->u.n, ==, 42);
-    qapi_free_AltStrNum(asn);
+    visit_type_AltEnumNum(v, NULL, &aen, &error_abort);
+    g_assert_cmpint(aen->type, ==, QTYPE_QFLOAT);
+    g_assert_cmpfloat(aen->u.n, ==, 42);
+    qapi_free_AltEnumNum(aen);
 
     v = visitor_input_test_init(data, "42");
-    visit_type_AltNumStr(v, NULL, &ans, &error_abort);
+    visit_type_AltNumEnum(v, NULL, &ans, &error_abort);
     g_assert_cmpint(ans->type, ==, QTYPE_QFLOAT);
     g_assert_cmpfloat(ans->u.n, ==, 42);
-    qapi_free_AltNumStr(ans);
+    qapi_free_AltNumEnum(ans);
 
     v = visitor_input_test_init(data, "42");
-    visit_type_AltStrInt(v, NULL, &asi, &error_abort);
+    visit_type_AltEnumInt(v, NULL, &asi, &error_abort);
     g_assert_cmpint(asi->type, ==, QTYPE_QINT);
     g_assert_cmpint(asi->u.i, ==, 42);
-    qapi_free_AltStrInt(asi);
+    qapi_free_AltEnumInt(asi);
 
     v = visitor_input_test_init(data, "42");
     visit_type_AltIntNum(v, NULL, &ain, &error_abort);
@@ -635,26 +635,26 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,
     /* Parsing a double */
 
     v = visitor_input_test_init(data, "42.5");
-    visit_type_AltStrBool(v, NULL, &asb, &err);
+    visit_type_AltEnumBool(v, NULL, &aeb, &err);
     error_free_or_abort(&err);
-    qapi_free_AltStrBool(asb);
+    qapi_free_AltEnumBool(aeb);
 
     v = visitor_input_test_init(data, "42.5");
-    visit_type_AltStrNum(v, NULL, &asn, &error_abort);
-    g_assert_cmpint(asn->type, ==, QTYPE_QFLOAT);
-    g_assert_cmpfloat(asn->u.n, ==, 42.5);
-    qapi_free_AltStrNum(asn);
+    visit_type_AltEnumNum(v, NULL, &aen, &error_abort);
+    g_assert_cmpint(aen->type, ==, QTYPE_QFLOAT);
+    g_assert_cmpfloat(aen->u.n, ==, 42.5);
+    qapi_free_AltEnumNum(aen);
 
     v = visitor_input_test_init(data, "42.5");
-    visit_type_AltNumStr(v, NULL, &ans, &error_abort);
+    visit_type_AltNumEnum(v, NULL, &ans, &error_abort);
     g_assert_cmpint(ans->type, ==, QTYPE_QFLOAT);
     g_assert_cmpfloat(ans->u.n, ==, 42.5);
-    qapi_free_AltNumStr(ans);
+    qapi_free_AltNumEnum(ans);
 
     v = visitor_input_test_init(data, "42.5");
-    visit_type_AltStrInt(v, NULL, &asi, &err);
+    visit_type_AltEnumInt(v, NULL, &asi, &err);
     error_free_or_abort(&err);
-    qapi_free_AltStrInt(asi);
+    qapi_free_AltEnumInt(asi);
 
     v = visitor_input_test_init(data, "42.5");
     visit_type_AltIntNum(v, NULL, &ain, &error_abort);
diff --git a/tests/test-qobject-output-visitor.c b/tests/test-qobject-output-visitor.c
index 94b9518..4e8fdf1 100644
--- a/tests/test-qobject-output-visitor.c
+++ b/tests/test-qobject-output-visitor.c
@@ -406,12 +406,12 @@ static void test_visitor_out_alternate(TestOutputVisitorData *data,
     visitor_reset(data);
     tmp = g_new0(UserDefAlternate, 1);
     tmp->type = QTYPE_QSTRING;
-    tmp->u.s = g_strdup("hello");
+    tmp->u.e = ENUM_ONE_VALUE1;
 
     visit_type_UserDefAlternate(data->ov, NULL, &tmp, &error_abort);
     qstr = qobject_to_qstring(visitor_get(data));
     g_assert(qstr);
-    g_assert_cmpstr(qstring_get_str(qstr), ==, "hello");
+    g_assert_cmpstr(qstring_get_str(qstr), ==, "value1");
 
     qapi_free_UserDefAlternate(tmp);
 
-- 
2.7.4

[Qemu-devel] [PULL 4/4] qapi: Reject alternates that can't work with keyval_parse()

[Markus Armbruster]

Alternates are sum types like unions, but use the JSON type on the
wire / QType in QObject instead of an explicit tag.  That's why we
require alternate members to have distinct QTypes.

The recently introduced keyval_parse() (commit d454dbe) can only
produce string scalars.  The qobject_input_visitor_new_keyval() input
visitor mostly hides the difference, so code using a QObject input
visitor doesn't have to care whether its input was parsed from JSON or
KEY=VALUE,...  The difference leaks for alternates, as noted in commit
0ee9ae7: a non-string, non-enum scalar alternate value can't currently
be expressed.

In part, this is just our insufficiently sophisticated implementation.
Consider alternate type 'GuestFileWhence'.  It has an integer member
and a 'QGASeek' member.  The latter is an enumeration with values
'set', 'cur', 'end'.  The meaning of b=set, b=cur, b=end, b=0, b=1 and
so forth is perfectly obvious.  However, our current implementation
falls apart at run time for b=0, b=1, and so forth.  Fixable, but not
today; add a test case and a TODO comment.

Now consider an alternate type with a string and an integer member.
What's the meaning of a=42?  Is it the string "42" or the integer 42?
Whichever meaning you pick makes the other inexpressible.  This isn't
just an implementation problem, it's fundamental.  Our current
implementation will pick string.

So far, we haven't needed such alternates.  To make sure we stop and
think before we add one that cannot sanely work with keyval_parse(),
let's require alternate members to have sufficiently distinct
representation in KEY=VALUE,... syntax:

* A string member clashes with any other scalar member

* An enumeration member clashes with bool members when it has value
  'on' or 'off'.

* An enumeration member clashes with numeric members when it has a
  value that starts with '-', '+', or a decimal digit.  This is a
  rather lazy approximation of the actual number syntax accepted by
  the visitor.

  Note that enumeration values starting with '-' and '+' are rejected
  elsewhere already, but better safe than sorry.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1495471335-23707-5-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 scripts/qapi.py                                     | 19 +++++++++++++++++--
 tests/Makefile.include                              |  2 ++
 tests/qapi-schema/alternate-conflict-dict.json      |  2 +-
 tests/qapi-schema/alternate-conflict-enum-bool.err  |  1 +
 tests/qapi-schema/alternate-conflict-enum-bool.exit |  1 +
 tests/qapi-schema/alternate-conflict-enum-bool.json |  6 ++++++
 tests/qapi-schema/alternate-conflict-enum-bool.out  |  0
 tests/qapi-schema/alternate-conflict-enum-int.err   |  1 +
 tests/qapi-schema/alternate-conflict-enum-int.exit  |  1 +
 tests/qapi-schema/alternate-conflict-enum-int.json  |  6 ++++++
 tests/qapi-schema/alternate-conflict-enum-int.out   |  0
 tests/qapi-schema/alternate-conflict-string.err     |  2 +-
 tests/qapi-schema/alternate-conflict-string.json    |  6 ++----
 tests/qapi-schema/qapi-schema-test.json             |  4 +++-
 tests/qapi-schema/qapi-schema-test.out              |  4 ++--
 tests/test-keyval.c                                 | 18 +++++++++++-------
 util/keyval.c                                       | 10 +++++-----
 17 files changed, 60 insertions(+), 23 deletions(-)
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.err
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.exit
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.json
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-bool.out
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.err
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.exit
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.json
 create mode 100644 tests/qapi-schema/alternate-conflict-enum-int.out

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 6c4d554..b7a25e4 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -812,11 +812,26 @@ def check_alternate(expr, info):
         if not qtype:
             raise QAPISemError(info, "Alternate '%s' member '%s' cannot use "
                                "type '%s'" % (name, key, value))
-        if qtype in types_seen:
+        conflicting = set([qtype])
+        if qtype == 'QTYPE_QSTRING':
+            enum_expr = enum_types.get(value)
+            if enum_expr:
+                for v in enum_expr['data']:
+                    if v in ['on', 'off']:
+                        conflicting.add('QTYPE_QBOOL')
+                    if re.match(r'[-+0-9.]', v): # lazy, could be tightened
+                        conflicting.add('QTYPE_QINT')
+                        conflicting.add('QTYPE_QFLOAT')
+            else:
+                conflicting.add('QTYPE_QINT')
+                conflicting.add('QTYPE_QFLOAT')
+                conflicting.add('QTYPE_QBOOL')
+        if conflicting & set(types_seen):
             raise QAPISemError(info, "Alternate '%s' member '%s' can't "
                                "be distinguished from member '%s'"
                                % (name, key, types_seen[qtype]))
-        types_seen[qtype] = key
+        for qt in conflicting:
+            types_seen[qt] = key
 
 
 def check_enum(expr, info):
diff --git a/tests/Makefile.include b/tests/Makefile.include
index 7589383..f42f3df 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -342,6 +342,8 @@ qapi-schema += alternate-array.json
 qapi-schema += alternate-base.json
 qapi-schema += alternate-clash.json
 qapi-schema += alternate-conflict-dict.json
+qapi-schema += alternate-conflict-enum-bool.json
+qapi-schema += alternate-conflict-enum-int.json
 qapi-schema += alternate-conflict-string.json
 qapi-schema += alternate-empty.json
 qapi-schema += alternate-nested.json
diff --git a/tests/qapi-schema/alternate-conflict-dict.json b/tests/qapi-schema/alternate-conflict-dict.json
index d566cca..3d78812 100644
--- a/tests/qapi-schema/alternate-conflict-dict.json
+++ b/tests/qapi-schema/alternate-conflict-dict.json
@@ -1,4 +1,4 @@
-# we reject alternates with multiple object branches
+# alternate branches of object type conflict with each other
 { 'struct': 'One',
   'data': { 'name': 'str' } }
 { 'struct': 'Two',
diff --git a/tests/qapi-schema/alternate-conflict-enum-bool.err b/tests/qapi-schema/alternate-conflict-enum-bool.err
new file mode 100644
index 0000000..0dfc002
--- /dev/null
+++ b/tests/qapi-schema/alternate-conflict-enum-bool.err
@@ -0,0 +1 @@
+tests/qapi-schema/alternate-conflict-enum-bool.json:4: Alternate 'Alt' member 'two' can't be distinguished from member 'one'
diff --git a/tests/qapi-schema/alternate-conflict-enum-bool.exit b/tests/qapi-schema/alternate-conflict-enum-bool.exit
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/tests/qapi-schema/alternate-conflict-enum-bool.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/alternate-conflict-enum-bool.json b/tests/qapi-schema/alternate-conflict-enum-bool.json
new file mode 100644
index 0000000..bff25c3
--- /dev/null
+++ b/tests/qapi-schema/alternate-conflict-enum-bool.json
@@ -0,0 +1,6 @@
+# alternate branch of 'enum' type that conflicts with bool
+{ 'enum': 'Enum',
+  'data': [ 'aus', 'off' ] }
+{ 'alternate': 'Alt',
+  'data': { 'one': 'Enum',
+            'two': 'bool' } }
diff --git a/tests/qapi-schema/alternate-conflict-enum-bool.out b/tests/qapi-schema/alternate-conflict-enum-bool.out
new file mode 100644
index 0000000..e69de29
diff --git a/tests/qapi-schema/alternate-conflict-enum-int.err b/tests/qapi-schema/alternate-conflict-enum-int.err
new file mode 100644
index 0000000..2cc8e7b
--- /dev/null
+++ b/tests/qapi-schema/alternate-conflict-enum-int.err
@@ -0,0 +1 @@
+tests/qapi-schema/alternate-conflict-enum-int.json:4: Alternate 'Alt' member 'two' can't be distinguished from member 'one'
diff --git a/tests/qapi-schema/alternate-conflict-enum-int.exit b/tests/qapi-schema/alternate-conflict-enum-int.exit
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/tests/qapi-schema/alternate-conflict-enum-int.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/alternate-conflict-enum-int.json b/tests/qapi-schema/alternate-conflict-enum-int.json
new file mode 100644
index 0000000..beb428c
--- /dev/null
+++ b/tests/qapi-schema/alternate-conflict-enum-int.json
@@ -0,0 +1,6 @@
+# alternate branches of 'enum' type that conflicts with numbers
+{ 'enum': 'Enum',
+  'data': [ '1', '2', '3' ] }
+{ 'alternate': 'Alt',
+  'data': { 'one': 'Enum',
+            'two': 'int' } }
diff --git a/tests/qapi-schema/alternate-conflict-enum-int.out b/tests/qapi-schema/alternate-conflict-enum-int.out
new file mode 100644
index 0000000..e69de29
diff --git a/tests/qapi-schema/alternate-conflict-string.err b/tests/qapi-schema/alternate-conflict-string.err
index fc523b0..fe2f188 100644
--- a/tests/qapi-schema/alternate-conflict-string.err
+++ b/tests/qapi-schema/alternate-conflict-string.err
@@ -1 +1 @@
-tests/qapi-schema/alternate-conflict-string.json:4: Alternate 'Alt' member 'two' can't be distinguished from member 'one'
+tests/qapi-schema/alternate-conflict-string.json:2: Alternate 'Alt' member 'two' can't be distinguished from member 'one'
diff --git a/tests/qapi-schema/alternate-conflict-string.json b/tests/qapi-schema/alternate-conflict-string.json
index 72f04a8..85adbd4 100644
--- a/tests/qapi-schema/alternate-conflict-string.json
+++ b/tests/qapi-schema/alternate-conflict-string.json
@@ -1,6 +1,4 @@
-# we reject alternates with multiple string-like branches
-{ 'enum': 'Enum',
-  'data': [ 'hello', 'world' ] }
+# alternate branches of 'str' type conflict with all scalar types
 { 'alternate': 'Alt',
   'data': { 'one': 'str',
-            'two': 'Enum' } }
+            'two': 'int' } }
diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index 303f2b2..17649c6 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -101,12 +101,14 @@
 # for testing use of 'number' within alternates
 { 'alternate': 'AltEnumBool', 'data': { 'e': 'EnumOne', 'b': 'bool' } }
 { 'alternate': 'AltEnumNum', 'data': { 'e': 'EnumOne', 'n': 'number' } }
-{ 'alternate': 'AltNumStr', 'data': { 'n': 'number', 's': 'str' } }
 { 'alternate': 'AltNumEnum', 'data': { 'n': 'number', 'e': 'EnumOne' } }
 { 'alternate': 'AltEnumInt', 'data': { 'e': 'EnumOne', 'i': 'int' } }
 { 'alternate': 'AltIntNum', 'data': { 'i': 'int', 'n': 'number' } }
 { 'alternate': 'AltNumInt', 'data': { 'n': 'number', 'i': 'int' } }
 
+# for testing use of 'str' within alternates
+{ 'alternate': 'AltStrObj', 'data': { 's': 'str', 'o': 'TestStruct' } }
+
 # for testing native lists
 { 'union': 'UserDefNativeListUnion',
   'data': { 'integer': ['int'],
diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 3081091..9f68610 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -22,10 +22,10 @@ alternate AltNumInt
     tag type
     case n: number
     case i: int
-alternate AltNumStr
+alternate AltStrObj
     tag type
-    case n: number
     case s: str
+    case o: TestStruct
 event EVENT_A None
    boxed=False
 event EVENT_B None
diff --git a/tests/test-keyval.c b/tests/test-keyval.c
index c556b1b..c3be005 100644
--- a/tests/test-keyval.c
+++ b/tests/test-keyval.c
@@ -614,22 +614,26 @@ static void test_keyval_visit_alternate(void)
     Error *err = NULL;
     Visitor *v;
     QDict *qdict;
-    AltNumStr *ans;
+    AltStrObj *aso;
     AltNumInt *ani;
+    AltEnumBool *aeb;
 
     /*
      * Can't do scalar alternate variants other than string.  You get
      * the string variant if there is one, else an error.
+     * TODO make it work for unambiguous cases like AltEnumBool below
      */
-    qdict = keyval_parse("a=1,b=2", NULL, &error_abort);
+    qdict = keyval_parse("a=1,b=2,c=on", NULL, &error_abort);
     v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
     QDECREF(qdict);
     visit_start_struct(v, NULL, NULL, 0, &error_abort);
-    visit_type_AltNumStr(v, "a", &ans, &error_abort);
-    g_assert_cmpint(ans->type, ==, QTYPE_QSTRING);
-    g_assert_cmpstr(ans->u.s, ==, "1");
-    qapi_free_AltNumStr(ans);
-    visit_type_AltNumInt(v, "a", &ani, &err);
+    visit_type_AltStrObj(v, "a", &aso, &error_abort);
+    g_assert_cmpint(aso->type, ==, QTYPE_QSTRING);
+    g_assert_cmpstr(aso->u.s, ==, "1");
+    qapi_free_AltStrObj(aso);
+    visit_type_AltNumInt(v, "b", &ani, &err);
+    error_free_or_abort(&err);
+    visit_type_AltEnumBool(v, "c", &aeb, &err);
     error_free_or_abort(&err);
     visit_end_struct(v, NULL);
     visit_free(v);
diff --git a/util/keyval.c b/util/keyval.c
index 93d5db6..7dbda62 100644
--- a/util/keyval.c
+++ b/util/keyval.c
@@ -65,11 +65,11 @@
  * denote numbers, true, false or null.  The special QObject input
  * visitor returned by qobject_input_visitor_new_keyval() mostly hides
  * this by automatically converting strings to the type the visitor
- * expects.  Breaks down for alternate types and type 'any', where the
- * visitor's expectation isn't clear.  Code visiting such types needs
- * to do the conversion itself, but only when using this keyval
- * visitor.  Awkward.  Alternate types without a string member don't
- * work at all.
+ * expects.  Breaks down for type 'any', where the visitor's
+ * expectation isn't clear.  Code visiting 'any' needs to do the
+ * conversion itself, but only when using this keyval visitor.
+ * Awkward.  Note that we carefully restrict alternate types to avoid
+ * similar ambiguity.
  *
  * Additional syntax for use with an implied key:
  *
-- 
2.7.4

Re: [Qemu-devel] [PULL 0/4] QAPI patches for 2017-05-31

[Peter Maydell]

On 31 May 2017 at 18:09, Markus Armbruster <armbru@redhat.com> wrote:
> The following changes since commit 0748b3526e8cb78b9cd64208426bfc3d54a72b04:
>
>   Merge remote-tracking branch 'kwolf/tags/for-upstream' into staging (2017-05-30 14:15:15 +0100)
>
> are available in the git repository at:
>
>   git://repo.or.cz/qemu/armbru.git tags/pull-qapi-2017-05-31
>
> for you to fetch changes up to c0644771ebedbd8f47f3c24816445e30111d226b:
>
>   qapi: Reject alternates that can't work with keyval_parse() (2017-05-31 16:04:09 +0200)
>
> ----------------------------------------------------------------
> QAPI patches for 2017-05-31
>
> ----------------------------------------------------------------
> Markus Armbruster (4):
>       qobject-input-visitor: Reject non-finite numbers with keyval
>       qapi: Document visit_type_any() issues with keyval input
>       tests/qapi-schema: Avoid 'str' in alternate test cases
>       qapi: Reject alternates that can't work with keyval_parse()
>

Applied, thanks.

-- PMM