An alternate type's visit_type_FOO() fails when it runs into an invalid ->type. If it's an input visit, we then need to free the the object we got from visit_start_alternate(). We do that with qapi_free_FOO(), which uses the dealloc visitor. Trouble is that object is in a bad state: its ->type is invalid. So the dealloc visitor will run into the same error again, and the error recovery skips deallocating the alternate's (invalid) alternative. Works, because qapi_free_FOO() ignores the error. Avoid it instead: free the messed up object with by g_free(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20200424084338.26803-11-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
362 lines
9.7 KiB
Python
362 lines
9.7 KiB
Python
"""
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QAPI visitor generator
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Copyright IBM, Corp. 2011
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Copyright (C) 2014-2018 Red Hat, Inc.
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Authors:
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Anthony Liguori <aliguori@us.ibm.com>
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Michael Roth <mdroth@linux.vnet.ibm.com>
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Markus Armbruster <armbru@redhat.com>
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This work is licensed under the terms of the GNU GPL, version 2.
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See the COPYING file in the top-level directory.
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"""
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from qapi.common import *
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from qapi.gen import QAPISchemaModularCVisitor, ifcontext
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from qapi.schema import QAPISchemaObjectType
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def gen_visit_decl(name, scalar=False):
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c_type = c_name(name) + ' *'
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if not scalar:
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c_type += '*'
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return mcgen('''
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void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_type)sobj, Error **errp);
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''',
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c_name=c_name(name), c_type=c_type)
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def gen_visit_members_decl(name):
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return mcgen('''
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void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp);
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''',
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c_name=c_name(name))
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def gen_visit_object_members(name, base, members, variants):
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ret = mcgen('''
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void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
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{
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Error *err = NULL;
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''',
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c_name=c_name(name))
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if base:
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ret += mcgen('''
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visit_type_%(c_type)s_members(v, (%(c_type)s *)obj, &err);
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if (err) {
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goto out;
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}
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''',
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c_type=base.c_name())
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for memb in members:
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ret += gen_if(memb.ifcond)
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if memb.optional:
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ret += mcgen('''
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if (visit_optional(v, "%(name)s", &obj->has_%(c_name)s)) {
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''',
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name=memb.name, c_name=c_name(memb.name))
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push_indent()
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ret += mcgen('''
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visit_type_%(c_type)s(v, "%(name)s", &obj->%(c_name)s, &err);
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if (err) {
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goto out;
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}
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''',
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c_type=memb.type.c_name(), name=memb.name,
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c_name=c_name(memb.name))
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if memb.optional:
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pop_indent()
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ret += mcgen('''
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}
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''')
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ret += gen_endif(memb.ifcond)
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if variants:
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ret += mcgen('''
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switch (obj->%(c_name)s) {
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''',
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c_name=c_name(variants.tag_member.name))
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for var in variants.variants:
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case_str = c_enum_const(variants.tag_member.type.name,
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var.name,
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variants.tag_member.type.prefix)
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ret += gen_if(var.ifcond)
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if var.type.name == 'q_empty':
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# valid variant and nothing to do
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ret += mcgen('''
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case %(case)s:
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break;
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''',
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case=case_str)
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else:
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ret += mcgen('''
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case %(case)s:
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visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, &err);
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break;
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''',
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case=case_str,
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c_type=var.type.c_name(), c_name=c_name(var.name))
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ret += gen_endif(var.ifcond)
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ret += mcgen('''
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default:
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abort();
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}
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''')
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# 'goto out' produced for base, for each member, and if variants were
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# present
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if base or members or variants:
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ret += mcgen('''
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out:
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''')
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ret += mcgen('''
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error_propagate(errp, err);
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}
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''')
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return ret
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def gen_visit_list(name, element_type):
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return mcgen('''
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void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
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{
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Error *err = NULL;
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%(c_name)s *tail;
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size_t size = sizeof(**obj);
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visit_start_list(v, name, (GenericList **)obj, size, &err);
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if (err) {
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goto out;
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}
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for (tail = *obj; tail;
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tail = (%(c_name)s *)visit_next_list(v, (GenericList *)tail, size)) {
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visit_type_%(c_elt_type)s(v, NULL, &tail->value, &err);
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if (err) {
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break;
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}
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}
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if (!err) {
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visit_check_list(v, &err);
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}
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visit_end_list(v, (void **)obj);
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if (err && visit_is_input(v)) {
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qapi_free_%(c_name)s(*obj);
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*obj = NULL;
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}
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out:
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error_propagate(errp, err);
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}
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''',
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c_name=c_name(name), c_elt_type=element_type.c_name())
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def gen_visit_enum(name):
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return mcgen('''
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void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s *obj, Error **errp)
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{
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int value = *obj;
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visit_type_enum(v, name, &value, &%(c_name)s_lookup, errp);
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*obj = value;
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}
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''',
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c_name=c_name(name))
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def gen_visit_alternate(name, variants):
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ret = mcgen('''
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void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
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{
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Error *err = NULL;
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visit_start_alternate(v, name, (GenericAlternate **)obj, sizeof(**obj),
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&err);
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if (err) {
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goto out;
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}
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if (!*obj) {
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/* incomplete */
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assert(visit_is_dealloc(v));
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goto out_obj;
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}
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switch ((*obj)->type) {
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''',
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c_name=c_name(name))
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for var in variants.variants:
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ret += gen_if(var.ifcond)
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ret += mcgen('''
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case %(case)s:
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''',
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case=var.type.alternate_qtype())
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if isinstance(var.type, QAPISchemaObjectType):
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ret += mcgen('''
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visit_start_struct(v, name, NULL, 0, &err);
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if (err) {
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break;
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}
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visit_type_%(c_type)s_members(v, &(*obj)->u.%(c_name)s, &err);
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if (!err) {
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visit_check_struct(v, &err);
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}
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visit_end_struct(v, NULL);
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''',
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c_type=var.type.c_name(),
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c_name=c_name(var.name))
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else:
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ret += mcgen('''
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visit_type_%(c_type)s(v, name, &(*obj)->u.%(c_name)s, &err);
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''',
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c_type=var.type.c_name(),
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c_name=c_name(var.name))
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ret += mcgen('''
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break;
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''')
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ret += gen_endif(var.ifcond)
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ret += mcgen('''
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case QTYPE_NONE:
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abort();
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default:
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error_setg(&err, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
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"%(name)s");
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/* Avoid passing invalid *obj to qapi_free_%(c_name)s() */
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g_free(*obj);
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*obj = NULL;
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}
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out_obj:
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visit_end_alternate(v, (void **)obj);
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if (err && visit_is_input(v)) {
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qapi_free_%(c_name)s(*obj);
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*obj = NULL;
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}
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out:
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error_propagate(errp, err);
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}
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''',
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name=name, c_name=c_name(name))
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return ret
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def gen_visit_object(name, base, members, variants):
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return mcgen('''
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void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
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{
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Error *err = NULL;
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visit_start_struct(v, name, (void **)obj, sizeof(%(c_name)s), &err);
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if (err) {
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goto out;
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}
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if (!*obj) {
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/* incomplete */
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assert(visit_is_dealloc(v));
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goto out_obj;
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}
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visit_type_%(c_name)s_members(v, *obj, &err);
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if (err) {
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goto out_obj;
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}
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visit_check_struct(v, &err);
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out_obj:
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visit_end_struct(v, (void **)obj);
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if (err && visit_is_input(v)) {
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qapi_free_%(c_name)s(*obj);
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*obj = NULL;
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}
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out:
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error_propagate(errp, err);
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}
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''',
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c_name=c_name(name))
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class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
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def __init__(self, prefix):
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super().__init__(
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prefix, 'qapi-visit', ' * Schema-defined QAPI visitors',
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' * Built-in QAPI visitors', __doc__)
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def _begin_system_module(self, name):
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self._genc.preamble_add(mcgen('''
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/qapi-builtin-visit.h"
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'''))
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self._genh.preamble_add(mcgen('''
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#include "qapi/visitor.h"
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#include "qapi/qapi-builtin-types.h"
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'''))
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def _begin_user_module(self, name):
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types = self._module_basename('qapi-types', name)
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visit = self._module_basename('qapi-visit', name)
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self._genc.preamble_add(mcgen('''
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "%(visit)s.h"
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''',
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visit=visit))
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self._genh.preamble_add(mcgen('''
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#include "qapi/qapi-builtin-visit.h"
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#include "%(types)s.h"
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''',
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types=types))
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def visit_enum_type(self, name, info, ifcond, features, members, prefix):
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with ifcontext(ifcond, self._genh, self._genc):
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self._genh.add(gen_visit_decl(name, scalar=True))
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self._genc.add(gen_visit_enum(name))
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def visit_array_type(self, name, info, ifcond, element_type):
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with ifcontext(ifcond, self._genh, self._genc):
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self._genh.add(gen_visit_decl(name))
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self._genc.add(gen_visit_list(name, element_type))
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def visit_object_type(self, name, info, ifcond, features,
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base, members, variants):
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# Nothing to do for the special empty builtin
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if name == 'q_empty':
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return
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with ifcontext(ifcond, self._genh, self._genc):
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self._genh.add(gen_visit_members_decl(name))
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self._genc.add(gen_visit_object_members(name, base,
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members, variants))
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# TODO Worth changing the visitor signature, so we could
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# directly use rather than repeat type.is_implicit()?
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if not name.startswith('q_'):
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# only explicit types need an allocating visit
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self._genh.add(gen_visit_decl(name))
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self._genc.add(gen_visit_object(name, base, members, variants))
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def visit_alternate_type(self, name, info, ifcond, features, variants):
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with ifcontext(ifcond, self._genh, self._genc):
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self._genh.add(gen_visit_decl(name))
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self._genc.add(gen_visit_alternate(name, variants))
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def gen_visit(schema, output_dir, prefix, opt_builtins):
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vis = QAPISchemaGenVisitVisitor(prefix)
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schema.visit(vis)
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vis.write(output_dir, opt_builtins)
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