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repository: Add new public gi_type_info_extract_ffi_return_value() API

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Dealing with FFI and return values is very tricky; this API allows
sharing the bits to do it between gobject-introspection and gjs (and
potentially other FFI binding consumers).

**NOTE** I swapped the order of the arguments, under the premise that
out arguments should generally be last.

https://bugzilla.gnome.org/show_bug.cgi?id=668902
This commit is contained in:
Colin Walters 2012-02-16 16:58:59 -05:00
parent 0d58e2e924
commit 4b71be0ef0
2 changed files with 11 additions and 7 deletions
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12
gicallableinfo.c
View File

@ -366,12 +366,10 @@ g_callable_info_iterate_return_attributes (GICallableInfo *info,
* Also see the ffi_call man page - the storage requirements for return
* values are "special".
*/
typedef GIArgument GIFFIReturnValue;
static void
set_gargument_from_ffi_return_value (GITypeInfo *return_info,
GIArgument *arg,
GIFFIReturnValue *ffi_value)
void
gi_type_info_extract_ffi_return_value (GITypeInfo *return_info,
GIFFIReturnValue *ffi_value,
GIArgument *arg)
{
switch (g_type_info_get_tag (return_info)) {
case GI_TYPE_TAG_INT8:
@ -618,7 +616,7 @@ _g_callable_info_invoke (GIFunctionInfo *info,
}
else
{
set_gargument_from_ffi_return_value(rinfo, return_value, &ffi_return_value);
gi_type_info_extract_ffi_return_value (rinfo, &ffi_return_value, return_value);
success = TRUE;
}
out:

6
girffi.h
View File

@ -46,10 +46,16 @@ struct _GIFunctionInvoker {
gpointer padding[3];
};
typedef GIArgument GIFFIReturnValue;
ffi_type * gi_type_tag_get_ffi_type (GITypeTag type_tag, gboolean is_pointer);
ffi_type * g_type_info_get_ffi_type (GITypeInfo *info);
void gi_type_info_extract_ffi_return_value (GITypeInfo *return_info,
GIFFIReturnValue *ffi_value,
GIArgument *arg);
gboolean g_function_info_prep_invoker (GIFunctionInfo *info,
GIFunctionInvoker *invoker,
GError **error);