From: Eric Blake Date: Wed, 18 Nov 2015 08:52:51 +0000 (-0700) Subject: qapi: Detect collisions in C member names X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=27b60ab93bd1d5d8c85f009aac7a97ffd2c53c86;p=qmiga%2Fqemu.git qapi: Detect collisions in C member names Detect attempts to declare two object members that would result in the same C member name, by keying the 'seen' dictionary off of the C name rather than the qapi name. It also requires passing info through the check_clash() methods. This addresses a TODO and fixes the previously-broken args-name-clash test. The resulting error message demonstrates the utility of the .describe() method added previously. No change to generated code. Signed-off-by: Eric Blake Message-Id: <1447836791-369-17-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster --- diff --git a/scripts/qapi.py b/scripts/qapi.py index 77d3e0a34a..4870326a09 100644 --- a/scripts/qapi.py +++ b/scripts/qapi.py @@ -977,20 +977,23 @@ class QAPISchemaObjectType(QAPISchemaType): self.base = schema.lookup_type(self._base_name) assert isinstance(self.base, QAPISchemaObjectType) self.base.check(schema) - self.base.check_clash(schema, seen) + self.base.check_clash(schema, self.info, seen) for m in self.local_members: m.check(schema) - m.check_clash(seen) + m.check_clash(self.info, seen) self.members = seen.values() if self.variants: self.variants.check(schema, seen) assert self.variants.tag_member in self.members - self.variants.check_clash(schema, seen) + self.variants.check_clash(schema, self.info, seen) - def check_clash(self, schema, seen): + # Check that the members of this type do not cause duplicate JSON fields, + # and update seen to track the members seen so far. Report any errors + # on behalf of info, which is not necessarily self.info + def check_clash(self, schema, info, seen): assert not self.variants # not implemented for m in self.members: - m.check_clash(seen) + m.check_clash(info, seen) def is_implicit(self): # See QAPISchema._make_implicit_object_type() @@ -1036,10 +1039,13 @@ class QAPISchemaObjectTypeMember(object): self.type = schema.lookup_type(self._type_name) assert self.type - def check_clash(self, seen): - # TODO change key of seen from QAPI name to C name - assert self.name not in seen - seen[self.name] = self + def check_clash(self, info, seen): + cname = c_name(self.name) + if cname in seen: + raise QAPIExprError(info, + "%s collides with %s" + % (self.describe(), seen[cname].describe())) + seen[cname] = self def _pretty_owner(self): owner = self.owner @@ -1080,7 +1086,8 @@ class QAPISchemaObjectTypeVariants(object): def check(self, schema, seen): if not self.tag_member: # flat union - self.tag_member = seen[self.tag_name] + self.tag_member = seen[c_name(self.tag_name)] + assert self.tag_name == self.tag_member.name assert isinstance(self.tag_member.type, QAPISchemaEnumType) for v in self.variants: v.check(schema) @@ -1088,12 +1095,12 @@ class QAPISchemaObjectTypeVariants(object): if isinstance(v.type, QAPISchemaObjectType): v.type.check(schema) - def check_clash(self, schema, seen): + def check_clash(self, schema, info, seen): for v in self.variants: # Reset seen map for each variant, since qapi names from one # branch do not affect another branch assert isinstance(v.type, QAPISchemaObjectType) - v.type.check_clash(schema, dict(seen)) + v.type.check_clash(schema, info, dict(seen)) class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember): diff --git a/tests/qapi-schema/args-name-clash.err b/tests/qapi-schema/args-name-clash.err index e69de29bb2..d953e8d241 100644 --- a/tests/qapi-schema/args-name-clash.err +++ b/tests/qapi-schema/args-name-clash.err @@ -0,0 +1 @@ +tests/qapi-schema/args-name-clash.json:4: 'a_b' (parameter of oops) collides with 'a-b' (parameter of oops) diff --git a/tests/qapi-schema/args-name-clash.exit b/tests/qapi-schema/args-name-clash.exit index 573541ac97..d00491fd7e 100644 --- a/tests/qapi-schema/args-name-clash.exit +++ b/tests/qapi-schema/args-name-clash.exit @@ -1 +1 @@ -0 +1 diff --git a/tests/qapi-schema/args-name-clash.json b/tests/qapi-schema/args-name-clash.json index 9e8f88916a..61423cb893 100644 --- a/tests/qapi-schema/args-name-clash.json +++ b/tests/qapi-schema/args-name-clash.json @@ -1,5 +1,4 @@ # C member name collision -# FIXME - This parses, but fails to compile, because the C struct is given -# two 'a_b' members. Either reject this at parse time, or munge the C names -# to avoid the collision. +# Reject members that clash when mapped to C names (we would have two 'a_b' +# members). { 'command': 'oops', 'data': { 'a-b': 'str', 'a_b': 'str' } } diff --git a/tests/qapi-schema/args-name-clash.out b/tests/qapi-schema/args-name-clash.out index 9b2f6e4d5f..e69de29bb2 100644 --- a/tests/qapi-schema/args-name-clash.out +++ b/tests/qapi-schema/args-name-clash.out @@ -1,6 +0,0 @@ -object :empty -object :obj-oops-arg - member a-b: str optional=False - member a_b: str optional=False -command oops :obj-oops-arg -> None - gen=True success_response=True