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Add a generic libffi based marshaller to libgobject

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This code is from https://bugzilla.gnome.org/show_bug.cgi?id=567087
and was adapted by myself to also support the GVariant fundamental
type.

Signed-off-by: David Zeuthen <davidz@redhat.com>
This commit is contained in:
David Zeuthen
2011-04-08 17:34:44 -04:00
parent 0b9229beca
commit 88ab35f3cb
7 changed files with 209 additions and 188 deletions
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194
gobject/gclosure.c
View File

@@ -26,6 +26,8 @@
#include <string.h>
#include <ffi.h>
#include "gclosure.h"
#include "gvalue.h"
@@ -935,6 +937,198 @@ g_signal_type_cclosure_new (GType itype,
return closure;
}
#include <ffi.h>
static ffi_type *
value_to_ffi_type (const GValue *gvalue, gpointer *value)
{
ffi_type *rettype = NULL;
GType type = g_type_fundamental (G_VALUE_TYPE (gvalue));
g_assert (type != G_TYPE_INVALID);
switch (type)
{
case G_TYPE_BOOLEAN:
case G_TYPE_CHAR:
case G_TYPE_INT:
rettype = &ffi_type_sint;
*value = (gpointer)&(gvalue->data[0].v_int);
break;
case G_TYPE_UCHAR:
case G_TYPE_UINT:
rettype = &ffi_type_uint;
*value = (gpointer)&(gvalue->data[0].v_uint);
break;
case G_TYPE_STRING:
case G_TYPE_OBJECT:
case G_TYPE_BOXED:
case G_TYPE_POINTER:
case G_TYPE_INTERFACE:
case G_TYPE_VARIANT:
rettype = &ffi_type_pointer;
*value = (gpointer)&(gvalue->data[0].v_pointer);
break;
case G_TYPE_FLOAT:
rettype = &ffi_type_float;
*value = (gpointer)&(gvalue->data[0].v_float);
break;
case G_TYPE_DOUBLE:
rettype = &ffi_type_double;
*value = (gpointer)&(gvalue->data[0].v_double);
break;
case G_TYPE_LONG:
rettype = &ffi_type_slong;
*value = (gpointer)&(gvalue->data[0].v_long);
break;
case G_TYPE_ULONG:
rettype = &ffi_type_ulong;
*value = (gpointer)&(gvalue->data[0].v_ulong);
break;
case G_TYPE_INT64:
rettype = &ffi_type_sint64;
*value = (gpointer)&(gvalue->data[0].v_int64);
break;
case G_TYPE_UINT64:
rettype = &ffi_type_uint64;
*value = (gpointer)&(gvalue->data[0].v_uint64);
break;
default:
rettype = &ffi_type_pointer;
*value = NULL;
g_warning ("value_to_ffi_type: Unsupported fundamental type: %s", g_type_name (type));
break;
}
return rettype;
}
static void
value_from_ffi_type (GValue *gvalue, gpointer *value)
{
switch (g_type_fundamental (G_VALUE_TYPE (gvalue)))
{
case G_TYPE_INT:
g_value_set_int (gvalue, *(gint*)value);
break;
case G_TYPE_FLOAT:
g_value_set_float (gvalue, *(gfloat*)value);
break;
case G_TYPE_DOUBLE:
g_value_set_double (gvalue, *(gdouble*)value);
break;
case G_TYPE_BOOLEAN:
g_value_set_boolean (gvalue, *(gboolean*)value);
break;
case G_TYPE_STRING:
g_value_set_string (gvalue, *(gchar**)value);
break;
case G_TYPE_CHAR:
g_value_set_char (gvalue, *(gchar*)value);
break;
case G_TYPE_UCHAR:
g_value_set_uchar (gvalue, *(guchar*)value);
break;
case G_TYPE_UINT:
g_value_set_uint (gvalue, *(guint*)value);
break;
case G_TYPE_POINTER:
g_value_set_pointer (gvalue, *(gpointer*)value);
break;
case G_TYPE_LONG:
g_value_set_long (gvalue, *(glong*)value);
break;
case G_TYPE_ULONG:
g_value_set_ulong (gvalue, *(gulong*)value);
break;
case G_TYPE_INT64:
g_value_set_int64 (gvalue, *(gint64*)value);
break;
case G_TYPE_UINT64:
g_value_set_uint64 (gvalue, *(guint64*)value);
break;
case G_TYPE_BOXED:
g_value_set_boxed (gvalue, *(gpointer*)value);
break;
default:
g_warning ("value_from_ffi_type: Unsupported fundamental type: %s",
g_type_name (g_type_fundamental (G_VALUE_TYPE (gvalue))));
}
}
/**
* g_cclosure_marshal_generic:
* @closure: A #GClosure.
* @return_gvalue: A #GValue to store the return value. May be %NULL
* if the callback of closure doesn't return a value.
* @n_param_values: The length of the @param_values array.
* @param_values: An array of #GValue<!-- -->s holding the arguments
* on which to invoke the callback of closure.
* @invocation_hint: The invocation hint given as the last argument to
* g_closure_invoke().
* @marshal_data: Additional data specified when registering the
* marshaller, see g_closure_set_marshal() and
* g_closure_set_meta_marshal()
*
* A generic marshaller function implemented via <ulink
* url="http://sourceware.org/libffi/">libffi</ulink>.
*
* Since: 2.30
*/
void
g_cclosure_marshal_generic (GClosure *closure,
GValue *return_gvalue,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
ffi_type *rtype;
void *rvalue;
int n_args;
ffi_type **atypes;
void **args;
int i;
ffi_cif cif;
GCClosure *cc = (GCClosure*) closure;
if (return_gvalue && G_VALUE_TYPE (return_gvalue))
{
rtype = value_to_ffi_type (return_gvalue, &rvalue);
}
else
{
rtype = &ffi_type_void;
}
rvalue = g_alloca (MAX (rtype->size, sizeof (ffi_arg)));
n_args = n_param_values + 1;
atypes = g_alloca (sizeof (ffi_type *) * n_args);
args = g_alloca (sizeof (gpointer) * n_args);
if (G_CCLOSURE_SWAP_DATA (closure))
{
atypes[n_args-1] = value_to_ffi_type (param_values + 0,
&args[n_args-1]);
atypes[0] = &ffi_type_pointer;
args[0] = &closure->data;
}
else
{
atypes[0] = value_to_ffi_type (param_values + 0, &args[0]);
atypes[n_args-1] = &ffi_type_pointer;
args[n_args-1] = &closure->data;
}
for (i = 1; i < n_args - 1; i++)
atypes[i] = value_to_ffi_type (param_values + i, &args[i]);
if (ffi_prep_cif (&cif, FFI_DEFAULT_ABI, n_args, rtype, atypes) != FFI_OK)
return;
ffi_call (&cif, marshal_data ? marshal_data : cc->callback, rvalue, args);
if (return_gvalue && G_VALUE_TYPE (return_gvalue))
value_from_ffi_type (return_gvalue, rvalue);
}
/**
* g_cclosure_marshal_VOID__VOID: