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qapi: Require boxed for conditional command and event arguments

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The C code generator fails to honor 'if' conditions of command and
event arguments.

For instance, tests/qapi-schema/qapi-schema-test.json has

    { 'event': 'TEST_IF_EVENT',
      'data': { 'foo': 'TestIfStruct',
		'bar': { 'type': ['str'], 'if': 'TEST_IF_EVT_ARG' } },
      'if': { 'all': ['TEST_IF_EVT', 'TEST_IF_STRUCT'] } }

Generated tests/test-qapi-events.h fails to honor the TEST_IF_EVT_ARG
condition:

    #if defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)
    void qapi_event_send_test_if_event(TestIfStruct *foo, strList *bar);
    #endif /* defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT) */

Only uses so far are in tests/.

We could fix the generator to emit something like

    #if defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT)
    void qapi_event_send_test_if_event(TestIfStruct *foo
    #if defined(TEST_IF_EVT_ARG)
                    , strList *bar
    #endif
                    );
    #endif /* defined(TEST_IF_EVT) && defined(TEST_IF_STRUCT) */

Ugly.  Calls become similarly ugly.  Not worth fixing.

Conditional arguments work fine with 'boxed': true, simply because
complex types with conditional members work fine.  Not worth breaking.

Reject conditional arguments unless boxed.

Move the tests cases covering unboxed conditional arguments out of
tests/qapi-schema/qapi-schema-test.json.  Cover boxed conditional
arguments there instead.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230316071325.492471-15-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Markus Armbruster 2023-03-16 08:13:25 +01:00
parent 713d921aed
commit de3b3f529d
16 changed files with 48 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

14
scripts/qapi/schema.py
View file

@ -486,6 +486,10 @@ class QAPISchemaObjectType(QAPISchemaType):
assert self.members is not None
return not self.members and not self.variants
def has_conditional_members(self):
assert self.members is not None
return any(m.ifcond.is_present() for m in self.members)
def c_name(self):
assert self.name != 'q_empty'
return super().c_name()
@ -817,6 +821,11 @@ class QAPISchemaCommand(QAPISchemaEntity):
self.info,
"command's 'data' can take %s only with 'boxed': true"
% self.arg_type.describe())
self.arg_type.check(schema)
if self.arg_type.has_conditional_members() and not self.boxed:
raise QAPISemError(
self.info,
"conditional command arguments require 'boxed': true")
if self._ret_type_name:
self.ret_type = schema.resolve_type(
self._ret_type_name, self.info, "command's 'returns'")
@ -872,6 +881,11 @@ class QAPISchemaEvent(QAPISchemaEntity):
self.info,
"event's 'data' can take %s only with 'boxed': true"
% self.arg_type.describe())
self.arg_type.check(schema)
if self.arg_type.has_conditional_members() and not self.boxed:
raise QAPISemError(
self.info,
"conditional event arguments require 'boxed': true")
def connect_doc(self, doc=None):
super().connect_doc(doc)