qemu/scripts/qapi/visit.py
Markus Armbruster 713d921aed qapi: Fix code generated for optional conditional struct member
The generated member visit neglects to emit #if around a conditional
struct member's has_ variable.  For instance,
tests/qapi-schema/qapi-schema-test.json generates

    #if defined(TEST_IF_STRUCT)
    bool visit_type_TestIfStruct_members(Visitor *v, TestIfStruct *obj, Error **errp)
    {
--->	bool has_baz = !!obj->baz;

	if (!visit_type_int(v, "foo", &obj->foo, errp)) {
	    return false;
	}
    #if defined(TEST_IF_STRUCT_MEMBER)
	if (!visit_type_int(v, "bar", &obj->bar, errp)) {
	    return false;
	}
    #endif /* defined(TEST_IF_STRUCT_MEMBER) */
    #if defined(TEST_IF_STRUCT_MEMBER)
	if (visit_optional(v, "baz", &has_baz)) {
	    if (!visit_type_str(v, "baz", &obj->baz, errp)) {
		return false;
	    }
	}
    #endif /* defined(TEST_IF_STRUCT_MEMBER) */
	return true;
    }
    [...]
    #endif /* defined(TEST_IF_STRUCT) */

Won't compile when TEST_IF_STRUCT is defined and TEST_IF_STRUCT_MEMBER
isn't.

Fix that the obvious way:

    #if defined(TEST_IF_STRUCT_MEMBER)
	bool has_baz = !!obj->baz;
    #endif /* defined(TEST_IF_STRUCT_MEMBER) */

Fixes: 44ea9d9be3 (qapi: Start to elide redundant has_FOO in generated C)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230316071325.492471-14-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
2023-04-24 15:21:39 +02:00

430 lines
12 KiB
Python

"""
QAPI visitor generator
Copyright IBM, Corp. 2011
Copyright (C) 2014-2018 Red Hat, Inc.
Authors:
Anthony Liguori <aliguori@us.ibm.com>
Michael Roth <mdroth@linux.vnet.ibm.com>
Markus Armbruster <armbru@redhat.com>
This work is licensed under the terms of the GNU GPL, version 2.
See the COPYING file in the top-level directory.
"""
from typing import List, Optional
from .common import (
c_enum_const,
c_name,
indent,
mcgen,
)
from .gen import (
QAPISchemaModularCVisitor,
gen_special_features,
ifcontext,
)
from .schema import (
QAPISchema,
QAPISchemaEnumMember,
QAPISchemaEnumType,
QAPISchemaFeature,
QAPISchemaIfCond,
QAPISchemaObjectType,
QAPISchemaObjectTypeMember,
QAPISchemaType,
QAPISchemaVariants,
)
from .source import QAPISourceInfo
def gen_visit_decl(name: str, scalar: bool = False) -> str:
c_type = c_name(name) + ' *'
if not scalar:
c_type += '*'
return mcgen('''
bool visit_type_%(c_name)s(Visitor *v, const char *name,
%(c_type)sobj, Error **errp);
''',
c_name=c_name(name), c_type=c_type)
def gen_visit_members_decl(name: str) -> str:
return mcgen('''
bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp);
''',
c_name=c_name(name))
def gen_visit_object_members(name: str,
base: Optional[QAPISchemaObjectType],
members: List[QAPISchemaObjectTypeMember],
variants: Optional[QAPISchemaVariants]) -> str:
ret = mcgen('''
bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
{
''',
c_name=c_name(name))
sep = ''
for memb in members:
if memb.optional and not memb.need_has():
ret += memb.ifcond.gen_if()
ret += mcgen('''
bool has_%(c_name)s = !!obj->%(c_name)s;
''',
c_name=c_name(memb.name))
sep = '\n'
ret += memb.ifcond.gen_endif()
ret += sep
if base:
ret += mcgen('''
if (!visit_type_%(c_type)s_members(v, (%(c_type)s *)obj, errp)) {
return false;
}
''',
c_type=base.c_name())
for memb in members:
ret += memb.ifcond.gen_if()
if memb.optional:
has = 'has_' + c_name(memb.name)
if memb.need_has():
has = 'obj->' + has
ret += mcgen('''
if (visit_optional(v, "%(name)s", &%(has)s)) {
''',
name=memb.name, has=has)
indent.increase()
special_features = gen_special_features(memb.features)
if special_features != '0':
ret += mcgen('''
if (visit_policy_reject(v, "%(name)s", %(special_features)s, errp)) {
return false;
}
if (!visit_policy_skip(v, "%(name)s", %(special_features)s)) {
''',
name=memb.name, special_features=special_features)
indent.increase()
ret += mcgen('''
if (!visit_type_%(c_type)s(v, "%(name)s", &obj->%(c_name)s, errp)) {
return false;
}
''',
c_type=memb.type.c_name(), name=memb.name,
c_name=c_name(memb.name))
if special_features != '0':
indent.decrease()
ret += mcgen('''
}
''')
if memb.optional:
indent.decrease()
ret += mcgen('''
}
''')
ret += memb.ifcond.gen_endif()
if variants:
tag_member = variants.tag_member
assert isinstance(tag_member.type, QAPISchemaEnumType)
ret += mcgen('''
switch (obj->%(c_name)s) {
''',
c_name=c_name(tag_member.name))
for var in variants.variants:
case_str = c_enum_const(tag_member.type.name, var.name,
tag_member.type.prefix)
ret += var.ifcond.gen_if()
if var.type.name == 'q_empty':
# valid variant and nothing to do
ret += mcgen('''
case %(case)s:
break;
''',
case=case_str)
else:
ret += mcgen('''
case %(case)s:
return visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, errp);
''',
case=case_str,
c_type=var.type.c_name(), c_name=c_name(var.name))
ret += var.ifcond.gen_endif()
ret += mcgen('''
default:
abort();
}
''')
ret += mcgen('''
return true;
}
''')
return ret
def gen_visit_list(name: str, element_type: QAPISchemaType) -> str:
return mcgen('''
bool visit_type_%(c_name)s(Visitor *v, const char *name,
%(c_name)s **obj, Error **errp)
{
bool ok = false;
%(c_name)s *tail;
size_t size = sizeof(**obj);
if (!visit_start_list(v, name, (GenericList **)obj, size, errp)) {
return false;
}
for (tail = *obj; tail;
tail = (%(c_name)s *)visit_next_list(v, (GenericList *)tail, size)) {
if (!visit_type_%(c_elt_type)s(v, NULL, &tail->value, errp)) {
goto out_obj;
}
}
ok = visit_check_list(v, errp);
out_obj:
visit_end_list(v, (void **)obj);
if (!ok && visit_is_input(v)) {
qapi_free_%(c_name)s(*obj);
*obj = NULL;
}
return ok;
}
''',
c_name=c_name(name), c_elt_type=element_type.c_name())
def gen_visit_enum(name: str) -> str:
return mcgen('''
bool visit_type_%(c_name)s(Visitor *v, const char *name,
%(c_name)s *obj, Error **errp)
{
int value = *obj;
bool ok = visit_type_enum(v, name, &value, &%(c_name)s_lookup, errp);
*obj = value;
return ok;
}
''',
c_name=c_name(name))
def gen_visit_alternate(name: str, variants: QAPISchemaVariants) -> str:
ret = mcgen('''
bool visit_type_%(c_name)s(Visitor *v, const char *name,
%(c_name)s **obj, Error **errp)
{
bool ok = false;
if (!visit_start_alternate(v, name, (GenericAlternate **)obj,
sizeof(**obj), errp)) {
return false;
}
if (!*obj) {
/* incomplete */
assert(visit_is_dealloc(v));
ok = true;
goto out_obj;
}
switch ((*obj)->type) {
''',
c_name=c_name(name))
for var in variants.variants:
ret += var.ifcond.gen_if()
ret += mcgen('''
case %(case)s:
''',
case=var.type.alternate_qtype())
if isinstance(var.type, QAPISchemaObjectType):
ret += mcgen('''
if (!visit_start_struct(v, name, NULL, 0, errp)) {
break;
}
if (visit_type_%(c_type)s_members(v, &(*obj)->u.%(c_name)s, errp)) {
ok = visit_check_struct(v, errp);
}
visit_end_struct(v, NULL);
''',
c_type=var.type.c_name(),
c_name=c_name(var.name))
else:
ret += mcgen('''
ok = visit_type_%(c_type)s(v, name, &(*obj)->u.%(c_name)s, errp);
''',
c_type=var.type.c_name(),
c_name=c_name(var.name))
ret += mcgen('''
break;
''')
ret += var.ifcond.gen_endif()
ret += mcgen('''
case QTYPE_NONE:
abort();
default:
assert(visit_is_input(v));
error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
"%(name)s");
/* Avoid passing invalid *obj to qapi_free_%(c_name)s() */
g_free(*obj);
*obj = NULL;
}
out_obj:
visit_end_alternate(v, (void **)obj);
if (!ok && visit_is_input(v)) {
qapi_free_%(c_name)s(*obj);
*obj = NULL;
}
return ok;
}
''',
name=name, c_name=c_name(name))
return ret
def gen_visit_object(name: str) -> str:
return mcgen('''
bool visit_type_%(c_name)s(Visitor *v, const char *name,
%(c_name)s **obj, Error **errp)
{
bool ok = false;
if (!visit_start_struct(v, name, (void **)obj, sizeof(%(c_name)s), errp)) {
return false;
}
if (!*obj) {
/* incomplete */
assert(visit_is_dealloc(v));
ok = true;
goto out_obj;
}
if (!visit_type_%(c_name)s_members(v, *obj, errp)) {
goto out_obj;
}
ok = visit_check_struct(v, errp);
out_obj:
visit_end_struct(v, (void **)obj);
if (!ok && visit_is_input(v)) {
qapi_free_%(c_name)s(*obj);
*obj = NULL;
}
return ok;
}
''',
c_name=c_name(name))
class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
def __init__(self, prefix: str):
super().__init__(
prefix, 'qapi-visit', ' * Schema-defined QAPI visitors',
' * Built-in QAPI visitors', __doc__)
def _begin_builtin_module(self) -> None:
self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qapi-builtin-visit.h"
'''))
self._genh.preamble_add(mcgen('''
#include "qapi/visitor.h"
#include "qapi/qapi-builtin-types.h"
'''))
def _begin_user_module(self, name: str) -> None:
types = self._module_basename('qapi-types', name)
visit = self._module_basename('qapi-visit', name)
self._genc.preamble_add(mcgen('''
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "%(visit)s.h"
''',
visit=visit))
self._genh.preamble_add(mcgen('''
#include "qapi/qapi-builtin-visit.h"
#include "%(types)s.h"
''',
types=types))
def visit_enum_type(self,
name: str,
info: Optional[QAPISourceInfo],
ifcond: QAPISchemaIfCond,
features: List[QAPISchemaFeature],
members: List[QAPISchemaEnumMember],
prefix: Optional[str]) -> None:
with ifcontext(ifcond, self._genh, self._genc):
self._genh.add(gen_visit_decl(name, scalar=True))
self._genc.add(gen_visit_enum(name))
def visit_array_type(self,
name: str,
info: Optional[QAPISourceInfo],
ifcond: QAPISchemaIfCond,
element_type: QAPISchemaType) -> None:
with ifcontext(ifcond, self._genh, self._genc):
self._genh.add(gen_visit_decl(name))
self._genc.add(gen_visit_list(name, element_type))
def visit_object_type(self,
name: str,
info: Optional[QAPISourceInfo],
ifcond: QAPISchemaIfCond,
features: List[QAPISchemaFeature],
base: Optional[QAPISchemaObjectType],
members: List[QAPISchemaObjectTypeMember],
variants: Optional[QAPISchemaVariants]) -> None:
# Nothing to do for the special empty builtin
if name == 'q_empty':
return
with ifcontext(ifcond, self._genh, self._genc):
self._genh.add(gen_visit_members_decl(name))
self._genc.add(gen_visit_object_members(name, base,
members, variants))
# TODO Worth changing the visitor signature, so we could
# directly use rather than repeat type.is_implicit()?
if not name.startswith('q_'):
# only explicit types need an allocating visit
self._genh.add(gen_visit_decl(name))
self._genc.add(gen_visit_object(name))
def visit_alternate_type(self,
name: str,
info: Optional[QAPISourceInfo],
ifcond: QAPISchemaIfCond,
features: List[QAPISchemaFeature],
variants: QAPISchemaVariants) -> None:
with ifcontext(ifcond, self._genh, self._genc):
self._genh.add(gen_visit_decl(name))
self._genc.add(gen_visit_alternate(name, variants))
def gen_visit(schema: QAPISchema,
output_dir: str,
prefix: str,
opt_builtins: bool) -> None:
vis = QAPISchemaGenVisitVisitor(prefix)
schema.visit(vis)
vis.write(output_dir, opt_builtins)