From 221db5daf6b3666f1c8e4ca06ae45892e99a112f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Date: Thu, 23 Jul 2020 16:38:45 +0100 Subject: [PATCH] qapi: enable use of g_autoptr with QAPI types MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently QAPI generates a type and function for free'ing it: typedef struct QCryptoBlockCreateOptions QCryptoBlockCreateOptions; void qapi_free_QCryptoBlockCreateOptions(QCryptoBlockCreateOptions *obj); This is used in the traditional manner: QCryptoBlockCreateOptions *opts = NULL; opts = g_new0(QCryptoBlockCreateOptions, 1); ....do stuff with opts... qapi_free_QCryptoBlockCreateOptions(opts); Since bumping the min glib to 2.48, QEMU has incrementally adopted the use of g_auto/g_autoptr. This allows the compiler to run a function to free a variable when it goes out of scope, the benefit being the compiler can guarantee it is freed in all possible code ptahs. This benefit is applicable to QAPI types too, and given the seriously long method names for some qapi_free_XXXX() functions, is much less typing. This change thus makes the code generator emit: G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoBlockCreateOptions, qapi_free_QCryptoBlockCreateOptions) The above code example now becomes g_autoptr(QCryptoBlockCreateOptions) opts = NULL; opts = g_new0(QCryptoBlockCreateOptions, 1); ....do stuff with opts... Note, if the local pointer needs to live beyond the scope holding the variable, then g_steal_pointer can be used. This is useful to return the pointer to the caller in the success codepath, while letting it be freed in all error codepaths. return g_steal_pointer(&opts); The crypto/block.h header needs updating to avoid symbol clash now that the g_autoptr support is a standard QAPI feature. Signed-off-by: Daniel P. Berrangé Message-Id: <20200723153845.2934357-1-berrange@redhat.com> Reviewed-by: Markus Armbruster Reviewed-by: Eric Blake Signed-off-by: Markus Armbruster --- docs/devel/qapi-code-gen.txt | 2 ++ include/crypto/block.h | 2 -- scripts/qapi/types.py | 1 + tests/test-qobject-input-visitor.c | 23 +++++++---------------- 4 files changed, 10 insertions(+), 18 deletions(-) diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt index 69eede6c28..f3e7ced212 100644 --- a/docs/devel/qapi-code-gen.txt +++ b/docs/devel/qapi-code-gen.txt @@ -1321,6 +1321,7 @@ Example: }; void qapi_free_UserDefOne(UserDefOne *obj); + G_DEFINE_AUTOPTR_CLEANUP_FUNC(UserDefOne, qapi_free_UserDefOne) struct UserDefOneList { UserDefOneList *next; @@ -1328,6 +1329,7 @@ Example: }; void qapi_free_UserDefOneList(UserDefOneList *obj); + G_DEFINE_AUTOPTR_CLEANUP_FUNC(UserDefOneList, qapi_free_UserDefOneList) struct q_obj_my_command_arg { UserDefOneList *arg1; diff --git a/include/crypto/block.h b/include/crypto/block.h index d274819791..7a65e8e402 100644 --- a/include/crypto/block.h +++ b/include/crypto/block.h @@ -311,7 +311,5 @@ uint64_t qcrypto_block_get_sector_size(QCryptoBlock *block); void qcrypto_block_free(QCryptoBlock *block); G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoBlock, qcrypto_block_free) -G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoBlockCreateOptions, - qapi_free_QCryptoBlockCreateOptions) #endif /* QCRYPTO_BLOCK_H */ diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py index 3ad33af4ee..3640f17cd6 100644 --- a/scripts/qapi/types.py +++ b/scripts/qapi/types.py @@ -213,6 +213,7 @@ def gen_type_cleanup_decl(name): ret = mcgen(''' void qapi_free_%(c_name)s(%(c_name)s *obj); +G_DEFINE_AUTOPTR_CLEANUP_FUNC(%(c_name)s, qapi_free_%(c_name)s) ''', c_name=c_name(name)) return ret diff --git a/tests/test-qobject-input-visitor.c b/tests/test-qobject-input-visitor.c index 6bacabf063..e41b91a2a6 100644 --- a/tests/test-qobject-input-visitor.c +++ b/tests/test-qobject-input-visitor.c @@ -417,7 +417,7 @@ static void test_visitor_in_struct(TestInputVisitorData *data, static void test_visitor_in_struct_nested(TestInputVisitorData *data, const void *unused) { - UserDefTwo *udp = NULL; + g_autoptr(UserDefTwo) udp = NULL; Visitor *v; v = visitor_input_test_init(data, "{ 'string0': 'string0', " @@ -433,8 +433,6 @@ static void test_visitor_in_struct_nested(TestInputVisitorData *data, g_assert_cmpstr(udp->dict1->dict2->userdef->string, ==, "string"); g_assert_cmpstr(udp->dict1->dict2->string, ==, "string2"); g_assert(udp->dict1->has_dict3 == false); - - qapi_free_UserDefTwo(udp); } static void test_visitor_in_list(TestInputVisitorData *data, @@ -546,7 +544,7 @@ static void test_visitor_in_union_flat(TestInputVisitorData *data, const void *unused) { Visitor *v; - UserDefFlatUnion *tmp; + g_autoptr(UserDefFlatUnion) tmp = NULL; UserDefUnionBase *base; v = visitor_input_test_init(data, @@ -563,8 +561,6 @@ static void test_visitor_in_union_flat(TestInputVisitorData *data, base = qapi_UserDefFlatUnion_base(tmp); g_assert(&base->enum1 == &tmp->enum1); - - qapi_free_UserDefFlatUnion(tmp); } static void test_visitor_in_alternate(TestInputVisitorData *data, @@ -690,7 +686,7 @@ static void test_list_union_integer_helper(TestInputVisitorData *data, const void *unused, UserDefListUnionKind kind) { - UserDefListUnion *cvalue = NULL; + g_autoptr(UserDefListUnion) cvalue = NULL; Visitor *v; GString *gstr_list = g_string_new(""); GString *gstr_union = g_string_new(""); @@ -782,7 +778,6 @@ static void test_list_union_integer_helper(TestInputVisitorData *data, g_string_free(gstr_union, true); g_string_free(gstr_list, true); - qapi_free_UserDefListUnion(cvalue); } static void test_visitor_in_list_union_int(TestInputVisitorData *data, @@ -851,7 +846,7 @@ static void test_visitor_in_list_union_uint64(TestInputVisitorData *data, static void test_visitor_in_list_union_bool(TestInputVisitorData *data, const void *unused) { - UserDefListUnion *cvalue = NULL; + g_autoptr(UserDefListUnion) cvalue = NULL; boolList *elem = NULL; Visitor *v; GString *gstr_list = g_string_new(""); @@ -879,13 +874,12 @@ static void test_visitor_in_list_union_bool(TestInputVisitorData *data, g_string_free(gstr_union, true); g_string_free(gstr_list, true); - qapi_free_UserDefListUnion(cvalue); } static void test_visitor_in_list_union_string(TestInputVisitorData *data, const void *unused) { - UserDefListUnion *cvalue = NULL; + g_autoptr(UserDefListUnion) cvalue = NULL; strList *elem = NULL; Visitor *v; GString *gstr_list = g_string_new(""); @@ -914,7 +908,6 @@ static void test_visitor_in_list_union_string(TestInputVisitorData *data, g_string_free(gstr_union, true); g_string_free(gstr_list, true); - qapi_free_UserDefListUnion(cvalue); } #define DOUBLE_STR_MAX 16 @@ -922,7 +915,7 @@ static void test_visitor_in_list_union_string(TestInputVisitorData *data, static void test_visitor_in_list_union_number(TestInputVisitorData *data, const void *unused) { - UserDefListUnion *cvalue = NULL; + g_autoptr(UserDefListUnion) cvalue = NULL; numberList *elem = NULL; Visitor *v; GString *gstr_list = g_string_new(""); @@ -957,7 +950,6 @@ static void test_visitor_in_list_union_number(TestInputVisitorData *data, g_string_free(gstr_union, true); g_string_free(gstr_list, true); - qapi_free_UserDefListUnion(cvalue); } static void input_visitor_test_add(const char *testpath, @@ -1253,7 +1245,7 @@ static void test_visitor_in_fail_alternate(TestInputVisitorData *data, static void do_test_visitor_in_qmp_introspect(TestInputVisitorData *data, const QLitObject *qlit) { - SchemaInfoList *schema = NULL; + g_autoptr(SchemaInfoList) schema = NULL; QObject *obj = qobject_from_qlit(qlit); Visitor *v; @@ -1262,7 +1254,6 @@ static void do_test_visitor_in_qmp_introspect(TestInputVisitorData *data, visit_type_SchemaInfoList(v, NULL, &schema, &error_abort); g_assert(schema); - qapi_free_SchemaInfoList(schema); qobject_unref(obj); visit_free(v); }