qapi: Fix c_name() munging

The method c_name() is supposed to do two different actions: munge
'-' into '_', and add a 'q_' prefix to ticklish names.  But it did
these steps out of order, making it possible to submit input that
is not ticklish until after munging, where the output then lacked
the desired prefix.

The failure is exposed easily if you have a compiler that recognizes
C11 keywords, and try to name a member '_Thread-local', as it would
result in trying to compile the declaration 'uint64_t _Thread_local;'
which is not valid.  However, this name violates our conventions
(ultimately, want to enforce that no qapi names start with single
underscore), so the test is slightly weaker by instead testing
'wchar-t'; the declaration 'uint64_t wchar_t;' is valid in C (where
wchar_t is only a typedef) but would fail with a C++ compiler (where
it is a keyword).

Fix things by reversing the order of actions within c_name().

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1447836791-369-18-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 4870326a0936e5d41e1022b6fd4deb6da5bd048c..d2ce9b3b1900aff9e4faa92b9c78b3787beb7ac6 100644 (file)
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -1482,10 +1482,11 @@ def c_name(name, protect=True):
                      'not_eq', 'or', 'or_eq', 'xor', 'xor_eq'])
     # namespace pollution:
     polluted_words = set(['unix', 'errno'])
+    name = name.translate(c_name_trans)
     if protect and (name in c89_words | c99_words | c11_words | gcc_words
                     | cpp_words | polluted_words):
         return "q_" + name
-    return name.translate(c_name_trans)
+    return name
 
 eatspace = '\033EATSPACE.'
 pointer_suffix = ' *' + eatspace

diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index 44638da948c99d4fd58ebb1b0329bad3ab47ab2b..4b895275c770c3805afc510a9140bccea239f16e 100644 (file)
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -152,12 +152,13 @@
 { 'event': 'EVENT_D',
   'data': { 'a' : 'EventStructOne', 'b' : 'str', '*c': 'str', '*enum3': 'EnumOne' } }
 
-# test that we correctly compile downstream extensions
+# test that we correctly compile downstream extensions, as well as munge
+# ticklish names
 { 'enum': '__org.qemu_x-Enum', 'data': [ '__org.qemu_x-value' ] }
 { 'struct': '__org.qemu_x-Base',
   'data': { '__org.qemu_x-member1': '__org.qemu_x-Enum' } }
 { 'struct': '__org.qemu_x-Struct', 'base': '__org.qemu_x-Base',
-  'data': { '__org.qemu_x-member2': 'str' } }
+  'data': { '__org.qemu_x-member2': 'str', '*wchar-t': 'int' } }
 { 'union': '__org.qemu_x-Union1', 'data': { '__org.qemu_x-branch': 'str' } }
 { 'struct': '__org.qemu_x-Struct2',
   'data': { 'array': ['__org.qemu_x-Union1'] } }

diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 786024ece397dc41dadd697ebb9b33bc9a91995b..0724a9f9327163f56aebf9e46dbf61c4895840c7 100644 (file)
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -185,6 +185,7 @@ enum __org.qemu_x-Enum ['__org.qemu_x-value']
 object __org.qemu_x-Struct
     base __org.qemu_x-Base
     member __org.qemu_x-member2: str optional=False
+    member wchar-t: int optional=True
 object __org.qemu_x-Struct2
     member array: __org.qemu_x-Union1List optional=False
 object __org.qemu_x-Union1

diff --git a/tests/test-qmp-commands.c b/tests/test-qmp-commands.c
index 888fb5ffec4c27278cea43de664b6e6a9d451ea7..9f35b80a45c31eb6ca208914398bdb956305bf9c 100644 (file)
--- a/tests/test-qmp-commands.c
+++ b/tests/test-qmp-commands.c
@@ -65,6 +65,10 @@ __org_qemu_x_Union1 *qmp___org_qemu_x_command(__org_qemu_x_EnumList *a,
     ret->type = ORG_QEMU_X_UNION1_KIND___ORG_QEMU_X_BRANCH;
     ret->u.__org_qemu_x_branch = strdup("blah1");
 
+    /* Also test that 'wchar-t' was munged to 'q_wchar_t' */
+    if (b && b->value && !b->value->has_q_wchar_t) {
+        b->value->q_wchar_t = 1;
+    }
     return ret;
 }