From 25a0d9c977c2f5db914b0a1619759fd77d97b016 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Mon, 12 Oct 2015 22:22:21 -0600 Subject: qapi: Use predicate callback to determine visit filtering Previously, qapi-types and qapi-visit filtered out implicit objects during visit_object_type() by using 'info' (works since implicit objects do not [yet] have associated info); meanwhile qapi-introspect filtered out all schema types on the first pass by returning a python type from visit_begin(), which was then used at a distance in QAPISchema.visit() to do the filtering. Rather than keeping these ad hoc approaches, add a new visitor callback visit_needed() which returns False to skip a given entity, and which defaults to True unless overridden. Use the new mechanism to simplify all three filtering visitors. No change to the generated code. Suggested-by: Markus Armbruster Signed-off-by: Eric Blake Message-Id: <1444710158-8723-2-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster --- scripts/qapi-introspect.py | 5 ++++- scripts/qapi-types.py | 19 +++++++++++-------- scripts/qapi-visit.py | 17 ++++++++++------- scripts/qapi.py | 12 ++++++++---- 4 files changed, 33 insertions(+), 20 deletions(-) (limited to 'scripts') diff --git a/scripts/qapi-introspect.py b/scripts/qapi-introspect.py index 7d39320..c0dad66 100644 --- a/scripts/qapi-introspect.py +++ b/scripts/qapi-introspect.py @@ -54,7 +54,6 @@ class QAPISchemaGenIntrospectVisitor(QAPISchemaVisitor): self._jsons = [] self._used_types = [] self._name_map = {} - return QAPISchemaType # don't visit types for now def visit_end(self): # visit the types that are actually used @@ -82,6 +81,10 @@ const char %(c_name)s[] = %(c_string)s; self._used_types = None self._name_map = None + def visit_needed(self, entity): + # Ignore types on first pass; visit_end() will pick up used types + return not isinstance(entity, QAPISchemaType) + def _name(self, name): if self._unmask: return name diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py index d405f8d..2a29c6e 100644 --- a/scripts/qapi-types.py +++ b/scripts/qapi-types.py @@ -233,6 +233,10 @@ class QAPISchemaGenTypeVisitor(QAPISchemaVisitor): self.decl = self._btin + self.decl self._btin = None + def visit_needed(self, entity): + # Visit everything except implicit objects + return not isinstance(entity, QAPISchemaObjectType) or entity.info + def _gen_type_cleanup(self, name): self.decl += gen_type_cleanup_decl(name) self.defn += gen_type_cleanup(name) @@ -254,14 +258,13 @@ class QAPISchemaGenTypeVisitor(QAPISchemaVisitor): self._gen_type_cleanup(name) def visit_object_type(self, name, info, base, members, variants): - if info: - self._fwdecl += gen_fwd_object_or_array(name) - if variants: - assert not members # not implemented - self.decl += gen_union(name, base, variants) - else: - self.decl += gen_struct(name, base, members) - self._gen_type_cleanup(name) + self._fwdecl += gen_fwd_object_or_array(name) + if variants: + assert not members # not implemented + self.decl += gen_union(name, base, variants) + else: + self.decl += gen_struct(name, base, members) + self._gen_type_cleanup(name) def visit_alternate_type(self, name, info, variants): self._fwdecl += gen_fwd_object_or_array(name) diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py index d7f51ee..b7a6470 100644 --- a/scripts/qapi-visit.py +++ b/scripts/qapi-visit.py @@ -335,6 +335,10 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor): self.decl = self._btin + self.decl self._btin = None + def visit_needed(self, entity): + # Visit everything except implicit objects + return not isinstance(entity, QAPISchemaObjectType) or entity.info + def visit_enum_type(self, name, info, values, prefix): self.decl += gen_visit_decl(name, scalar=True) self.defn += gen_visit_enum(name) @@ -351,13 +355,12 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor): self.defn += defn def visit_object_type(self, name, info, base, members, variants): - if info: - self.decl += gen_visit_decl(name) - if variants: - assert not members # not implemented - self.defn += gen_visit_union(name, base, variants) - else: - self.defn += gen_visit_struct(name, base, members) + self.decl += gen_visit_decl(name) + if variants: + assert not members # not implemented + self.defn += gen_visit_union(name, base, variants) + else: + self.defn += gen_visit_struct(name, base, members) def visit_alternate_type(self, name, info, variants): self.decl += gen_visit_decl(name) diff --git a/scripts/qapi.py b/scripts/qapi.py index 26cff3f..543b378 100644 --- a/scripts/qapi.py +++ b/scripts/qapi.py @@ -811,6 +811,10 @@ class QAPISchemaVisitor(object): def visit_end(self): pass + def visit_needed(self, entity): + # Default to visiting everything + return True + def visit_builtin_type(self, name, info, json_type): pass @@ -1304,10 +1308,10 @@ class QAPISchema(object): ent.check(self) def visit(self, visitor): - ignore = visitor.visit_begin(self) - for name in sorted(self._entity_dict.keys()): - if not ignore or not isinstance(self._entity_dict[name], ignore): - self._entity_dict[name].visit(visitor) + visitor.visit_begin(self) + for (name, entity) in sorted(self._entity_dict.items()): + if visitor.visit_needed(entity): + entity.visit(visitor) visitor.visit_end() -- cgit v1.1