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[Qemu-devel] [PATCH v6 04/15] qapi: leave the ifcond attribute undefined
From: |
Marc-André Lureau |
Subject: |
[Qemu-devel] [PATCH v6 04/15] qapi: leave the ifcond attribute undefined until check() |
Date: |
Wed, 27 Jun 2018 18:35:40 +0200 |
We commonly initialize attributes to None in .init(), then set their
real value in .check(). Accessing the attribute before .check()
yields None. If we're lucky, the code that accesses the attribute
prematurely chokes on None.
It won't for .ifcond, because None is a legitimate value.
Leave the ifcond attribute undefined until check().
Suggested-by: Markus Armbruster <address@hidden>
Signed-off-by: Marc-André Lureau <address@hidden>
Reviewed-by: Markus Armbruster <address@hidden>
---
scripts/qapi/common.py | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 4f4014b387..46e33e23e4 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -1021,13 +1021,19 @@ class QAPISchemaEntity(object):
# such place).
self.info = info
self.doc = doc
- self.ifcond = listify_cond(ifcond)
+ self._ifcond = ifcond # self.ifcond is set only after .check()
def c_name(self):
return c_name(self.name)
def check(self, schema):
- pass
+ if isinstance(self._ifcond, QAPISchemaType):
+ # inherit the condition from a type
+ typ = self._ifcond
+ typ.check(schema)
+ self.ifcond = typ.ifcond
+ else:
+ self.ifcond = listify_cond(self._ifcond)
def is_implicit(self):
return not self.info
@@ -1164,6 +1170,7 @@ class QAPISchemaEnumType(QAPISchemaType):
self.prefix = prefix
def check(self, schema):
+ QAPISchemaType.check(self, schema)
seen = {}
for v in self.values:
v.check_clash(self.info, seen)
@@ -1196,8 +1203,10 @@ class QAPISchemaArrayType(QAPISchemaType):
self.element_type = None
def check(self, schema):
+ QAPISchemaType.check(self, schema)
self.element_type = schema.lookup_type(self._element_type_name)
assert self.element_type
+ self.element_type.check(schema)
self.ifcond = self.element_type.ifcond
def is_implicit(self):
@@ -1240,6 +1249,7 @@ class QAPISchemaObjectType(QAPISchemaType):
self.members = None
def check(self, schema):
+ QAPISchemaType.check(self, schema)
if self.members is False: # check for cycles
raise QAPISemError(self.info,
"Object %s contains itself" % self.name)
@@ -1430,6 +1440,7 @@ class QAPISchemaAlternateType(QAPISchemaType):
self.variants = variants
def check(self, schema):
+ QAPISchemaType.check(self, schema)
self.variants.tag_member.check(schema)
# Not calling self.variants.check_clash(), because there's nothing
# to clash with
@@ -1474,6 +1485,7 @@ class QAPISchemaCommand(QAPISchemaEntity):
self.allow_preconfig = allow_preconfig
def check(self, schema):
+ QAPISchemaEntity.check(self, schema)
if self._arg_type_name:
self.arg_type = schema.lookup_type(self._arg_type_name)
assert (isinstance(self.arg_type, QAPISchemaObjectType) or
@@ -1509,6 +1521,7 @@ class QAPISchemaEvent(QAPISchemaEntity):
self.boxed = boxed
def check(self, schema):
+ QAPISchemaEntity.check(self, schema)
if self._arg_type_name:
self.arg_type = schema.lookup_type(self._arg_type_name)
assert (isinstance(self.arg_type, QAPISchemaObjectType) or
@@ -1642,7 +1655,7 @@ class QAPISchema(object):
# But it's not tight: the disjunction need not imply it. We
# may end up compiling useless wrapper types.
# TODO kill simple unions or implement the disjunction
- assert ifcond == typ.ifcond
+ assert ifcond == typ._ifcond # pylint: disable=protected-access
else:
self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond,
None, members, None))
@@ -1688,7 +1701,7 @@ class QAPISchema(object):
assert len(typ) == 1
typ = self._make_array_type(typ[0], info)
typ = self._make_implicit_object_type(
- typ, info, None, self.lookup_type(typ).ifcond,
+ typ, info, None, self.lookup_type(typ),
'wrapper', [self._make_member('data', typ, info)])
return QAPISchemaObjectTypeVariant(case, typ)
--
2.18.0.rc1
- [Qemu-devel] [PATCH v6 00/15] qapi: add #if pre-processor conditions to generated code (part 1), Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 01/15] qapi: add 'if' to top-level expressions, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 02/15] tests, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 03/15] qapi: pass 'if' condition into QAPISchemaEntity objects, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 04/15] qapi: leave the ifcond attribute undefined until check(),
Marc-André Lureau <=
- [Qemu-devel] [PATCH v6 06/15] qapi: mcgen() shouldn't indent # lines, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 05/15] qapi: add 'ifcond' to visitor methods, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 07/15] qapi: add #if/#endif helpers, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 08/15] qapi-introspect: modify to_qlit() to append ', ' on level > 0, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 11/15] qapi/events: add #if conditions to events, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 09/15] qapi-introspect: add preprocessor conditions to generated QLit, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 10/15] qapi/commands: add #if conditions to commands, Marc-André Lureau, 2018/06/27
- [Qemu-devel] [PATCH v6 12/15] qapi-types: add #if conditions to types & visitors, Marc-André Lureau, 2018/06/27