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bh=N4azpmc9rB+4CBBmQSzlqTOouprq/lBfFIMBJAbTPG8=; b=aLUHhIjoj3pCMO5Bs4d1TNC6+pdpn+gSrbTwYsjMmiQ9ZMF8H0qfDhLMVxqik+RQ6O3x6D SqUlkcfwhXlVoiY/aAwRa5xZ//kzB69UWJObEpo347aFNpyYuYsKjNTIl9pauzMYC+nsII hSGN4Sjz7VUkeB9RzdjRMrlVI2tbDKI= X-MC-Unique: JgeUcyAYMnO1BwHQV77ZpQ-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH v4 40/45] qapi: Smooth visitor error checking in generated code Date: Tue, 7 Jul 2020 18:06:08 +0200 Message-Id: <20200707160613.848843-41-armbru@redhat.com> In-Reply-To: <20200707160613.848843-1-armbru@redhat.com> References: <20200707160613.848843-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" Use visitor functions' return values to check for failure. Eliminate error_propagate() that are now unnecessary. Delete @err that are now unused. Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake --- docs/devel/qapi-code-gen.txt | 60 ++++++++++++++---------------------- scripts/qapi/commands.py | 22 ++++++------- scripts/qapi/visit.py | 57 ++++++++++++++-------------------- 3 files changed, 55 insertions(+), 84 deletions(-) diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt index 9bfc57063c..69eede6c28 100644 --- a/docs/devel/qapi-code-gen.txt +++ b/docs/devel/qapi-code-gen.txt @@ -1420,8 +1420,6 @@ Example: =20 bool visit_type_UserDefOne_members(Visitor *v, UserDefOne *obj, Error = **errp) { - Error *err =3D NULL; - if (!visit_type_int(v, "integer", &obj->integer, errp)) { return false; } @@ -1430,13 +1428,12 @@ Example: return false; } } - error_propagate(errp, err); - return !err; + return true; } =20 bool visit_type_UserDefOne(Visitor *v, const char *name, UserDefOne **= obj, Error **errp) { - Error *err =3D NULL; + bool ok =3D false; =20 if (!visit_start_struct(v, name, (void **)obj, sizeof(UserDefOne),= errp)) { return false; @@ -1446,24 +1443,22 @@ Example: assert(visit_is_dealloc(v)); goto out_obj; } - visit_type_UserDefOne_members(v, *obj, &err); - if (err) { + if (!visit_type_UserDefOne_members(v, *obj, errp)) { goto out_obj; } - visit_check_struct(v, &err); + ok =3D visit_check_struct(v, errp); out_obj: visit_end_struct(v, (void **)obj); - if (err && visit_is_input(v)) { + if (!ok && visit_is_input(v)) { qapi_free_UserDefOne(*obj); *obj =3D NULL; } - error_propagate(errp, err); - return !err; + return ok; } =20 bool visit_type_UserDefOneList(Visitor *v, const char *name, UserDefOn= eList **obj, Error **errp) { - Error *err =3D NULL; + bool ok =3D false; UserDefOneList *tail; size_t size =3D sizeof(**obj); =20 @@ -1473,33 +1468,27 @@ Example: =20 for (tail =3D *obj; tail; tail =3D (UserDefOneList *)visit_next_list(v, (GenericList *)= tail, size)) { - visit_type_UserDefOne(v, NULL, &tail->value, &err); - if (err) { - break; + if (!visit_type_UserDefOne(v, NULL, &tail->value, errp)) { + goto out_obj; } } =20 - if (!err) { - visit_check_list(v, &err); - } + ok =3D visit_check_list(v, errp); + out_obj: visit_end_list(v, (void **)obj); - if (err && visit_is_input(v)) { + if (!ok && visit_is_input(v)) { qapi_free_UserDefOneList(*obj); *obj =3D NULL; } - error_propagate(errp, err); - return !err; + return ok; } =20 bool visit_type_q_obj_my_command_arg_members(Visitor *v, q_obj_my_comm= and_arg *obj, Error **errp) { - Error *err =3D NULL; - if (!visit_type_UserDefOneList(v, "arg1", &obj->arg1, errp)) { return false; } - error_propagate(errp, err); - return !err; + return true; } =20 [Uninteresting stuff omitted...] @@ -1554,15 +1543,12 @@ Example: =20 static void qmp_marshal_output_UserDefOne(UserDefOne *ret_in, QObject = **ret_out, Error **errp) { - Error *err =3D NULL; Visitor *v; =20 v =3D qobject_output_visitor_new(ret_out); - visit_type_UserDefOne(v, "unused", &ret_in, &err); - if (!err) { + if (visit_type_UserDefOne(v, "unused", &ret_in, errp)) { visit_complete(v, ret_out); } - error_propagate(errp, err); visit_free(v); v =3D qapi_dealloc_visitor_new(); visit_type_UserDefOne(v, "unused", &ret_in, NULL); @@ -1572,33 +1558,32 @@ Example: void qmp_marshal_my_command(QDict *args, QObject **ret, Error **errp) { Error *err =3D NULL; + bool ok =3D false; Visitor *v; UserDefOne *retval; q_obj_my_command_arg arg =3D {0}; =20 v =3D qobject_input_visitor_new(QOBJECT(args)); - visit_start_struct(v, NULL, NULL, 0, &err); - if (err) { + if (!visit_start_struct(v, NULL, NULL, 0, errp)) { goto out; } - visit_type_q_obj_my_command_arg_members(v, &arg, &err); - if (!err) { - visit_check_struct(v, &err); + if (visit_type_q_obj_my_command_arg_members(v, &arg, errp)) { + ok =3D visit_check_struct(v, errp); } visit_end_struct(v, NULL); - if (err) { + if (!ok) { goto out; } =20 retval =3D qmp_my_command(arg.arg1, &err); + error_propagate(errp, err); if (err) { goto out; } =20 - qmp_marshal_output_UserDefOne(retval, ret, &err); + qmp_marshal_output_UserDefOne(retval, ret, errp); =20 out: - error_propagate(errp, err); visit_free(v); v =3D qapi_dealloc_visitor_new(); visit_start_struct(v, NULL, NULL, 0, NULL); @@ -1606,6 +1591,7 @@ Example: visit_end_struct(v, NULL); visit_free(v); } + [Uninteresting stuff omitted...] $ cat qapi-generated/example-qapi-init-commands.h [Uninteresting stuff omitted...] diff --git a/scripts/qapi/commands.py b/scripts/qapi/commands.py index 6809b0fb6e..3cf9e1110b 100644 --- a/scripts/qapi/commands.py +++ b/scripts/qapi/commands.py @@ -47,6 +47,7 @@ def gen_call(name, arg_type, boxed, ret_type): ret =3D mcgen(''' =20 %(lhs)sqmp_%(c_name)s(%(args)s&err); + error_propagate(errp, err); ''', c_name=3Dc_name(name), args=3Dargstr, lhs=3Dlhs) if ret_type: @@ -55,7 +56,7 @@ def gen_call(name, arg_type, boxed, ret_type): goto out; } =20 - qmp_marshal_output_%(c_name)s(retval, ret, &err); + qmp_marshal_output_%(c_name)s(retval, ret, errp); ''', c_name=3Dret_type.c_name()) return ret @@ -66,15 +67,12 @@ def gen_marshal_output(ret_type): =20 static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in, QObject **ret= _out, Error **errp) { - Error *err =3D NULL; Visitor *v; =20 v =3D qobject_output_visitor_new(ret_out); - visit_type_%(c_name)s(v, "unused", &ret_in, &err); - if (!err) { + if (visit_type_%(c_name)s(v, "unused", &ret_in, errp)) { visit_complete(v, ret_out); } - error_propagate(errp, err); visit_free(v); v =3D qapi_dealloc_visitor_new(); visit_type_%(c_name)s(v, "unused", &ret_in, NULL); @@ -104,6 +102,7 @@ def gen_marshal(name, arg_type, boxed, ret_type): %(proto)s { Error *err =3D NULL; + bool ok =3D false; Visitor *v; ''', proto=3Dbuild_marshal_proto(name)) @@ -123,28 +122,26 @@ def gen_marshal(name, arg_type, boxed, ret_type): ret +=3D mcgen(''' =20 v =3D qobject_input_visitor_new(QOBJECT(args)); - visit_start_struct(v, NULL, NULL, 0, &err); - if (err) { + if (!visit_start_struct(v, NULL, NULL, 0, errp)) { goto out; } ''') =20 if have_args: ret +=3D mcgen(''' - visit_type_%(c_arg_type)s_members(v, &arg, &err); - if (!err) { - visit_check_struct(v, &err); + if (visit_type_%(c_arg_type)s_members(v, &arg, errp)) { + ok =3D visit_check_struct(v, errp); } ''', c_arg_type=3Darg_type.c_name()) else: ret +=3D mcgen(''' - visit_check_struct(v, &err); + ok =3D visit_check_struct(v, errp); ''') =20 ret +=3D mcgen(''' visit_end_struct(v, NULL); - if (err) { + if (!ok) { goto out; } ''') @@ -154,7 +151,6 @@ def gen_marshal(name, arg_type, boxed, ret_type): ret +=3D mcgen(''' =20 out: - error_propagate(errp, err); visit_free(v); ''') =20 diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py index ba0cf0b074..3fb2f30510 100644 --- a/scripts/qapi/visit.py +++ b/scripts/qapi/visit.py @@ -41,8 +41,6 @@ def gen_visit_object_members(name, base, members, variant= s): =20 bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **er= rp) { - Error *err =3D NULL; - ''', c_name=3Dc_name(name)) =20 @@ -97,8 +95,7 @@ bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s= *obj, Error **errp) else: ret +=3D mcgen(''' case %(case)s: - visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, &err); - break; + return visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, errp); ''', case=3Dcase_str, c_type=3Dvar.type.c_name(), c_name=3Dc_name(v= ar.name)) @@ -111,8 +108,7 @@ bool visit_type_%(c_name)s_members(Visitor *v, %(c_name= )s *obj, Error **errp) ''') =20 ret +=3D mcgen(''' - error_propagate(errp, err); - return !err; + return true; } ''') return ret @@ -123,7 +119,7 @@ def gen_visit_list(name, element_type): =20 bool visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj,= Error **errp) { - Error *err =3D NULL; + bool ok =3D false; %(c_name)s *tail; size_t size =3D sizeof(**obj); =20 @@ -133,22 +129,19 @@ bool visit_type_%(c_name)s(Visitor *v, const char *na= me, %(c_name)s **obj, Error =20 for (tail =3D *obj; tail; tail =3D (%(c_name)s *)visit_next_list(v, (GenericList *)tail, si= ze)) { - visit_type_%(c_elt_type)s(v, NULL, &tail->value, &err); - if (err) { - break; + if (!visit_type_%(c_elt_type)s(v, NULL, &tail->value, errp)) { + goto out_obj; } } =20 - if (!err) { - visit_check_list(v, &err); - } + ok =3D visit_check_list(v, errp); +out_obj: visit_end_list(v, (void **)obj); - if (err && visit_is_input(v)) { + if (!ok && visit_is_input(v)) { qapi_free_%(c_name)s(*obj); *obj =3D NULL; } - error_propagate(errp, err); - return !err; + return ok; } ''', c_name=3Dc_name(name), c_elt_type=3Delement_type.c_name()) @@ -173,7 +166,7 @@ def gen_visit_alternate(name, variants): =20 bool visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj,= Error **errp) { - Error *err =3D NULL; + bool ok =3D false; =20 if (!visit_start_alternate(v, name, (GenericAlternate **)obj, sizeof(**obj), errp)) { @@ -182,6 +175,7 @@ bool visit_type_%(c_name)s(Visitor *v, const char *name= , %(c_name)s **obj, Error if (!*obj) { /* incomplete */ assert(visit_is_dealloc(v)); + ok =3D true; goto out_obj; } switch ((*obj)->type) { @@ -196,13 +190,11 @@ bool visit_type_%(c_name)s(Visitor *v, const char *na= me, %(c_name)s **obj, Error case=3Dvar.type.alternate_qtype()) if isinstance(var.type, QAPISchemaObjectType): ret +=3D mcgen(''' - visit_start_struct(v, name, NULL, 0, &err); - if (err) { + if (!visit_start_struct(v, name, NULL, 0, errp)) { break; } - visit_type_%(c_type)s_members(v, &(*obj)->u.%(c_name)s, &err); - if (!err) { - visit_check_struct(v, &err); + if (visit_type_%(c_type)s_members(v, &(*obj)->u.%(c_name)s, errp))= { + ok =3D visit_check_struct(v, errp); } visit_end_struct(v, NULL); ''', @@ -210,7 +202,7 @@ bool visit_type_%(c_name)s(Visitor *v, const char *name= , %(c_name)s **obj, Error c_name=3Dc_name(var.name)) else: ret +=3D mcgen(''' - visit_type_%(c_type)s(v, name, &(*obj)->u.%(c_name)s, &err); + ok =3D visit_type_%(c_type)s(v, name, &(*obj)->u.%(c_name)s, errp); ''', c_type=3Dvar.type.c_name(), c_name=3Dc_name(var.name)) @@ -224,7 +216,7 @@ bool visit_type_%(c_name)s(Visitor *v, const char *name= , %(c_name)s **obj, Error abort(); default: assert(visit_is_input(v)); - error_setg(&err, QERR_INVALID_PARAMETER_TYPE, name ? name : "null", + 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); @@ -232,12 +224,11 @@ bool visit_type_%(c_name)s(Visitor *v, const char *na= me, %(c_name)s **obj, Error } out_obj: visit_end_alternate(v, (void **)obj); - if (err && visit_is_input(v)) { + if (!ok && visit_is_input(v)) { qapi_free_%(c_name)s(*obj); *obj =3D NULL; } - error_propagate(errp, err); - return !err; + return ok; } ''', name=3Dname, c_name=3Dc_name(name)) @@ -250,7 +241,7 @@ def gen_visit_object(name, base, members, variants): =20 bool visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj,= Error **errp) { - Error *err =3D NULL; + bool ok =3D false; =20 if (!visit_start_struct(v, name, (void **)obj, sizeof(%(c_name)s), err= p)) { return false; @@ -260,19 +251,17 @@ bool visit_type_%(c_name)s(Visitor *v, const char *na= me, %(c_name)s **obj, Error assert(visit_is_dealloc(v)); goto out_obj; } - visit_type_%(c_name)s_members(v, *obj, &err); - if (err) { + if (!visit_type_%(c_name)s_members(v, *obj, errp)) { goto out_obj; } - visit_check_struct(v, &err); + ok =3D visit_check_struct(v, errp); out_obj: visit_end_struct(v, (void **)obj); - if (err && visit_is_input(v)) { + if (!ok && visit_is_input(v)) { qapi_free_%(c_name)s(*obj); *obj =3D NULL; } - error_propagate(errp, err); - return !err; + return ok; } ''', c_name=3Dc_name(name)) --=20 2.26.2