From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45799) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zuad3-0008Vz-3B for qemu-devel@nongnu.org; Fri, 06 Nov 2015 01:36:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zuad0-00049Q-Sn for qemu-devel@nongnu.org; Fri, 06 Nov 2015 01:36:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51857) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zuad0-00048i-Lw for qemu-devel@nongnu.org; Fri, 06 Nov 2015 01:36:02 -0500 From: Eric Blake Date: Thu, 5 Nov 2015 23:35:37 -0700 Message-Id: <1446791754-23823-14-git-send-email-eblake@redhat.com> In-Reply-To: <1446791754-23823-1-git-send-email-eblake@redhat.com> References: <1446791754-23823-1-git-send-email-eblake@redhat.com> Subject: [Qemu-devel] [PATCH v10 13/30] qapi: Track simple union tag in object.local_members List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: armbru@redhat.com, Michael Roth We were previously creating all unions with an empty list for local_members. However, it will make it easier to unify struct and union generation if we include the generated tag member in local_members. That way, we can have a common code pattern: visit the base (if any), visit the local members (if any), visit the variants (if any). The local_members of a flat union remains empty (because the discriminator is already visited as part of the base). Then, by visiting tag_member.check() during AlternateType.check(), we no longer need to call it during Variants.check(). The various front end entities now exist as follows: struct: optional base, optional local_members, no variants simple union: no base, one-element local_members, variants with tag_member from local_members flat union: base, no local_members, variants with tag_member from base alternate: no base, no local_members, variants With the new local members, we require a bit of finesse to avoid assertions in the clients. No change to generated code. Signed-off-by: Eric Blake --- v10: no change v9: improve commit message, add comments, tweak how alternates check tag_member v8: new patch --- scripts/qapi-types.py | 5 ++++- scripts/qapi-visit.py | 5 ++++- scripts/qapi.py | 16 +++++++++++----- tests/qapi-schema/qapi-schema-test.out | 2 ++ tests/qapi-schema/union-clash-data.out | 1 + tests/qapi-schema/union-empty.out | 1 + 6 files changed, 23 insertions(+), 7 deletions(-) diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py index b37900f..946afab 100644 --- a/scripts/qapi-types.py +++ b/scripts/qapi-types.py @@ -269,7 +269,10 @@ class QAPISchemaGenTypeVisitor(QAPISchemaVisitor): def visit_object_type(self, name, info, base, members, variants): self._fwdecl += gen_fwd_object_or_array(name) if variants: - assert not members # not implemented + if members: + # Members other than variants.tag_member not implemented + assert len(members) == 1 + assert members[0] == variants.tag_member self.decl += gen_union(name, base, variants) else: self.decl += gen_struct(name, base, members) diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py index 3ef5c16..94cd113 100644 --- a/scripts/qapi-visit.py +++ b/scripts/qapi-visit.py @@ -364,7 +364,10 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor): def visit_object_type(self, name, info, base, members, variants): self.decl += gen_visit_decl(name) if variants: - assert not members # not implemented + if members: + # Members other than variants.tag_member not implemented + assert len(members) == 1 + assert members[0] == variants.tag_member self.defn += gen_visit_union(name, base, variants) else: self.defn += gen_visit_struct(name, base, members) diff --git a/scripts/qapi.py b/scripts/qapi.py index 7c50cc4..a814e20 100644 --- a/scripts/qapi.py +++ b/scripts/qapi.py @@ -957,6 +957,9 @@ class QAPISchemaArrayType(QAPISchemaType): class QAPISchemaObjectType(QAPISchemaType): def __init__(self, name, info, base, local_members, variants): + # struct has local_members, optional base, and no variants + # flat union has base, variants, and no local_members + # simple union has local_members, variants, and no base QAPISchemaType.__init__(self, name, info) assert base is None or isinstance(base, str) for m in local_members: @@ -1048,10 +1051,11 @@ class QAPISchemaObjectTypeVariants(object): self.variants = variants def check(self, schema, members, seen): - if self.tag_name: + # seen is non-empty for unions, empty for alternates + if self.tag_name: # flat union self.tag_member = seen[self.tag_name] - else: - self.tag_member.check(schema, members, seen) + if seen: + assert self.tag_member in seen.itervalues() assert isinstance(self.tag_member.type, QAPISchemaEnumType) for v in self.variants: vseen = dict(seen) @@ -1085,6 +1089,7 @@ class QAPISchemaAlternateType(QAPISchemaType): self.variants = variants def check(self, schema): + self.variants.tag_member.check(schema, [], {}) self.variants.check(schema, [], {}) def json_type(self): @@ -1270,13 +1275,14 @@ class QAPISchema(object): if tag_name: variants = [self._make_variant(key, value) for (key, value) in data.iteritems()] + members = [] else: variants = [self._make_simple_variant(key, value, info) for (key, value) in data.iteritems()] tag_member = self._make_implicit_tag(name, info, variants) + members = [tag_member] self._def_entity( - QAPISchemaObjectType(name, info, base, - self._make_members(OrderedDict(), info), + QAPISchemaObjectType(name, info, base, members, QAPISchemaObjectTypeVariants(tag_name, tag_member, variants))) diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out index e20a823..786024e 100644 --- a/tests/qapi-schema/qapi-schema-test.out +++ b/tests/qapi-schema/qapi-schema-test.out @@ -132,6 +132,7 @@ object UserDefFlatUnion2 case value2: UserDefB case value3: UserDefA object UserDefNativeListUnion + member type: UserDefNativeListUnionKind optional=False case integer: :obj-intList-wrapper case s8: :obj-int8List-wrapper case s16: :obj-int16List-wrapper @@ -187,6 +188,7 @@ object __org.qemu_x-Struct object __org.qemu_x-Struct2 member array: __org.qemu_x-Union1List optional=False object __org.qemu_x-Union1 + member type: __org.qemu_x-Union1Kind optional=False case __org.qemu_x-branch: :obj-str-wrapper enum __org.qemu_x-Union1Kind ['__org.qemu_x-branch'] object __org.qemu_x-Union2 diff --git a/tests/qapi-schema/union-clash-data.out b/tests/qapi-schema/union-clash-data.out index 6277239..cea8551 100644 --- a/tests/qapi-schema/union-clash-data.out +++ b/tests/qapi-schema/union-clash-data.out @@ -2,5 +2,6 @@ object :empty object :obj-int-wrapper member data: int optional=False object TestUnion + member type: TestUnionKind optional=False case data: :obj-int-wrapper enum TestUnionKind ['data'] diff --git a/tests/qapi-schema/union-empty.out b/tests/qapi-schema/union-empty.out index 8b5a7bf..9c89fd1 100644 --- a/tests/qapi-schema/union-empty.out +++ b/tests/qapi-schema/union-empty.out @@ -1,3 +1,4 @@ object :empty object Union + member type: UnionKind optional=False enum UnionKind [] -- 2.4.3