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glib-genmarshal: Avoid a string copy for static string valist arguments

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When building a valist marshaller, we can avoid a string copy if the
argument is known to always be static. The marshaller we ship in
`gmarshal.c` got this right, but marshallers generated by
glib-genmarshal were missing the optimisation. Fix that, and add a unit
test.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Fixes: #1792
This commit is contained in:
Philip Withnall 2019-06-08 00:24:37 +01:00
parent f044ddc1ee
commit 1e10d6b6dd
2 changed files with 133 additions and 0 deletions
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1
gobject/glib-genmarshal.in
View File

@ -330,6 +330,7 @@ IN_ARGS = {
'ctype': 'gpointer', 'ctype': 'gpointer',
'getter': 'g_marshal_value_peek_string', 'getter': 'g_marshal_value_peek_string',
'box': ['g_strdup', 'g_free'], 'box': ['g_strdup', 'g_free'],
'static-check': True,
}, },
'PARAM': { 'PARAM': {
'signal': 'PARAM', 'signal': 'PARAM',

132
gobject/tests/genmarshal.py
View File

@ -462,6 +462,138 @@ class TestGenmarshal(unittest.TestCase):
''').strip().format(**body_result.subs), ''').strip().format(**body_result.subs),
body_result.out.strip()) body_result.out.strip())
def test_void_string_nostdinc(self):
"""Test running with a basic VOID:STRING list, but without the
standard marshallers, and with valist support enabled. This checks that
the valist marshaller for STRING correctly skips a string copy if the
argument is static.
See issue #1792.
"""
(header_result, body_result) = \
self.runGenmarshalWithList('VOID:STRING', '--quiet', '--nostdinc',
'--valist-marshaller')
self.assertEqual('', header_result.err)
self.assertEqual('', body_result.err)
self.assertEqual(dedent(
'''
/* {standard_top_comment} */
{standard_top_pragma}
G_BEGIN_DECLS
/* VOID:STRING ({list_path}:1) */
extern
void g_cclosure_user_marshal_VOID__STRING (GClosure *closure,
GValue *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);
extern
void g_cclosure_user_marshal_VOID__STRINGv (GClosure *closure,
GValue *return_value,
gpointer instance,
va_list args,
gpointer marshal_data,
int n_params,
GType *param_types);
G_END_DECLS
{standard_bottom_pragma}
''').strip().format(**header_result.subs),
header_result.out.strip())
self.assertEqual(dedent(
'''
/* {standard_top_comment} */
{standard_marshal_peek_defines}
/* VOID:STRING ({list_path}:1) */
void
g_cclosure_user_marshal_VOID__STRING (GClosure *closure,
GValue *return_value G_GNUC_UNUSED,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint G_GNUC_UNUSED,
gpointer marshal_data)
{{
typedef void (*GMarshalFunc_VOID__STRING) (gpointer data1,
gpointer arg1,
gpointer data2);
GCClosure *cc = (GCClosure *) closure;
gpointer data1, data2;
GMarshalFunc_VOID__STRING callback;
g_return_if_fail (n_param_values == 2);
if (G_CCLOSURE_SWAP_DATA (closure))
{{
data1 = closure->data;
data2 = g_value_peek_pointer (param_values + 0);
}}
else
{{
data1 = g_value_peek_pointer (param_values + 0);
data2 = closure->data;
}}
callback = (GMarshalFunc_VOID__STRING) (marshal_data ? marshal_data : cc->callback);
callback (data1,
g_marshal_value_peek_string (param_values + 1),
data2);
}}
void
g_cclosure_user_marshal_VOID__STRINGv (GClosure *closure,
GValue *return_value G_GNUC_UNUSED,
gpointer instance,
va_list args,
gpointer marshal_data,
int n_params,
GType *param_types)
{{
typedef void (*GMarshalFunc_VOID__STRING) (gpointer data1,
gpointer arg1,
gpointer data2);
GCClosure *cc = (GCClosure *) closure;
gpointer data1, data2;
GMarshalFunc_VOID__STRING callback;
gpointer arg0;
va_list args_copy;
G_VA_COPY (args_copy, args);
arg0 = (gpointer) va_arg (args_copy, gpointer);
if ((param_types[0] & G_SIGNAL_TYPE_STATIC_SCOPE) == 0 && arg0 != NULL)
arg0 = g_strdup (arg0);
va_end (args_copy);
if (G_CCLOSURE_SWAP_DATA (closure))
{{
data1 = closure->data;
data2 = instance;
}}
else
{{
data1 = instance;
data2 = closure->data;
}}
callback = (GMarshalFunc_VOID__STRING) (marshal_data ? marshal_data : cc->callback);
callback (data1,
arg0,
data2);
if ((param_types[0] & G_SIGNAL_TYPE_STATIC_SCOPE) == 0 && arg0 != NULL)
g_free (arg0);
}}
''').strip().format(**body_result.subs),
body_result.out.strip())
if __name__ == '__main__': if __name__ == '__main__':
unittest.main(testRunner=taptestrunner.TAPTestRunner()) unittest.main(testRunner=taptestrunner.TAPTestRunner())