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[girffi] Clean up API, add g_function_info_prep_invoker

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Rather than having bindings use g_function_info_invoke, which is basically
a toy/demo API, export a convenience utility function which takes the introspection
information and sets up things we need to pass to libffi.

Then invocation can be done directly to libffi by a binding.

As part of this work, remove some (unused by gjs) public functions from the
girffi API, and instead export a function to map to libffi which can work
semi-correctly.

https://bugzilla.gnome.org/show_bug.cgi?id=604074
This commit is contained in:
Colin Walters
2009-12-07 11:54:18 -05:00
parent 3bff396653
commit f2f0625622
6 changed files with 190 additions and 147 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
Makefile.am
View File

@@ -17,6 +17,7 @@ libgirepository_1_0_la_SOURCES = \
girepository.c \
girffi.c \
girffi.h \
girffi-private.h \
glib-compat.h \
gtypelib.c \
gtypelib.h

15
ginvoke.c
View File

@@ -37,17 +37,6 @@ g_invoke_error_quark (void)
return quark;
}
#include "ffi.h"
static ffi_type *
get_ffi_type (GITypeInfo *info)
{
if (g_type_info_is_pointer (info))
return &ffi_type_pointer;
else
return g_ir_ffi_get_ffi_type (g_type_info_get_tag (info));
}
/**
* g_function_info_invoke:
* @info: a #GIFunctionInfo describing the function to invoke
@@ -116,7 +105,7 @@ g_function_info_invoke (GIFunctionInfo *info,
throws = g_function_info_get_flags (info) & GI_FUNCTION_THROWS;
tinfo = g_callable_info_get_return_type ((GICallableInfo *)info);
rtype = get_ffi_type (tinfo);
rtype = g_type_info_get_ffi_type (tinfo);
g_base_info_unref ((GIBaseInfo *)tinfo);
in_pos = 0;
@@ -159,7 +148,7 @@ g_function_info_invoke (GIFunctionInfo *info,
{
case GI_DIRECTION_IN:
tinfo = g_arg_info_get_type (ainfo);
atypes[i+offset] = get_ffi_type (tinfo);
atypes[i+offset] = g_type_info_get_ffi_type (tinfo);
g_base_info_unref ((GIBaseInfo *)tinfo);
if (in_pos >= n_in_args)

32
girffi-private.h Normal file
View File

@@ -0,0 +1,32 @@
/* GObject introspection: Private helper functions for ffi integration
*
* Copyright (C) 2008, 2009 Red Hat, Inc
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GIRFFI_PRIVATE_H__
#define __GIRFFI_PRIVATE_H__
#include "girffi.h"
G_BEGIN_DECLS
ffi_type * g_ir_ffi_get_ffi_type (GITypeTag type_tag, gboolean is_pointer);
G_END_DECLS
#endif /* __GIRFFI_PRIVATE_H__ */

262
girffi.c
View File

@@ -30,12 +30,11 @@
#include "girepository.h"
ffi_type *
g_ir_ffi_get_ffi_type (GITypeTag tag)
g_ir_ffi_get_ffi_type (GITypeTag tag,
gboolean is_pointer)
{
switch (tag)
{
case GI_TYPE_TAG_VOID:
return &ffi_type_void;
case GI_TYPE_TAG_BOOLEAN:
return &ffi_type_uint;
case GI_TYPE_TAG_INT8:
@@ -104,131 +103,28 @@ g_ir_ffi_get_ffi_type (GITypeTag tag)
case GI_TYPE_TAG_GHASH:
case GI_TYPE_TAG_ERROR:
return &ffi_type_pointer;
case GI_TYPE_TAG_VOID:
if (is_pointer)
return &ffi_type_pointer;
else
return &ffi_type_void;
}
g_assert_not_reached ();
return NULL;
}
}
GArgument *
g_ir_ffi_convert_arguments(GICallableInfo *callable_info, void **args)
/**
* g_type_info_get_ffi_type:
* @info: A #GITypeInfo
*
* Returns: A #ffi_type corresponding to the platform default C ABI for @info.
*/
ffi_type *
g_type_info_get_ffi_type (GITypeInfo *info)
{
gint num_args, i;
GIArgInfo *arg_info;
GITypeInfo *arg_type;
GITypeTag tag;
GArgument *g_args;
num_args = g_callable_info_get_n_args (callable_info);
g_args = g_new0 (GArgument, num_args);
for (i = 0; i < num_args; i++)
{
arg_info = g_callable_info_get_arg (callable_info, i);
arg_type = g_arg_info_get_type (arg_info);
tag = g_type_info_get_tag (arg_type);
switch (tag)
{
case GI_TYPE_TAG_BOOLEAN:
g_args[i].v_boolean = *(gboolean *) args[i];
break;
case GI_TYPE_TAG_INT8:
g_args[i].v_int8 = *(gint8 *) args[i];
break;
case GI_TYPE_TAG_UINT8:
g_args[i].v_uint8 = *(guint8 *) args[i];
break;
case GI_TYPE_TAG_INT16:
g_args[i].v_int16 = *(gint16 *) args[i];
break;
case GI_TYPE_TAG_UINT16:
g_args[i].v_uint16 = *(guint16 *) args[i];
break;
case GI_TYPE_TAG_INT32:
g_args[i].v_int32 = *(gint32 *) args[i];
break;
case GI_TYPE_TAG_UINT32:
g_args[i].v_uint32 = *(guint32 *) args[i];
break;
case GI_TYPE_TAG_LONG:
g_args[i].v_long = *(glong *) args[i];
break;
case GI_TYPE_TAG_INT64:
g_args[i].v_int64 = *(gint64 *) args[i];
break;
case GI_TYPE_TAG_ULONG:
g_args[i].v_ulong = *(gulong *) args[i];
break;
case GI_TYPE_TAG_UINT64:
g_args[i].v_uint64 = *(guint64 *) args[i];
break;
case GI_TYPE_TAG_INT:
g_args[i].v_int = *(gint *) args[i];
break;
case GI_TYPE_TAG_SSIZE:
g_args[i].v_ssize = *(gssize *) args[i];
break;
case GI_TYPE_TAG_SIZE:
g_args[i].v_size = *(gsize *) args[i];
break;
case GI_TYPE_TAG_UINT:
g_args[i].v_uint = *(guint *) args[i];
break;
case GI_TYPE_TAG_FLOAT:
g_args[i].v_float = *(gfloat *) args[i];
break;
case GI_TYPE_TAG_DOUBLE:
g_args[i].v_double = *(gdouble *) args[i];
break;
case GI_TYPE_TAG_UTF8:
g_args[i].v_string = *(gchar **) args[i];
break;
case GI_TYPE_TAG_INTERFACE:
{
GIBaseInfo *interface;
GIInfoType interface_type;
interface = g_type_info_get_interface (arg_type);
interface_type = g_base_info_get_type (interface);
if (interface_type == GI_INFO_TYPE_OBJECT ||
interface_type == GI_INFO_TYPE_INTERFACE)
{
g_args[i].v_pointer = *(gpointer *) args[i];
g_base_info_unref (interface);
break;
}
else if (interface_type == GI_INFO_TYPE_ENUM ||
interface_type == GI_INFO_TYPE_FLAGS)
{
g_args[i].v_double = *(double *) args[i];
g_base_info_unref (interface);
break;
}
else if (interface_type == GI_INFO_TYPE_STRUCT)
{
g_args[i].v_pointer = *(gpointer *) args[i];
g_base_info_unref (interface);
break;
}
g_base_info_unref (interface);
}
case GI_TYPE_TAG_GLIST:
case GI_TYPE_TAG_GSLIST:
g_args[i].v_pointer = *(gpointer *) args[i];
break;
default:
g_args[i].v_pointer = 0;
}
g_base_info_unref ((GIBaseInfo *) arg_info);
g_base_info_unref ((GIBaseInfo *) arg_type);
}
return g_args;
return g_ir_ffi_get_ffi_type (g_type_info_get_tag (info), g_type_info_is_pointer (info));
}
/**
@@ -238,7 +134,7 @@ g_ir_ffi_convert_arguments(GICallableInfo *callable_info, void **args)
* Return value: an array of ffi_type*. The array itself
* should be freed using g_free() after use.
*/
ffi_type **
static ffi_type **
g_callable_info_get_ffi_arg_types (GICallableInfo *callable_info)
{
ffi_type **arg_types;
@@ -254,8 +150,7 @@ g_callable_info_get_ffi_arg_types (GICallableInfo *callable_info)
{
GIArgInfo *arg_info = g_callable_info_get_arg (callable_info, i);
GITypeInfo *arg_type = g_arg_info_get_type (arg_info);
GITypeTag type_tag = g_type_info_get_tag (arg_type);
arg_types[i] = g_ir_ffi_get_ffi_type (type_tag);
arg_types[i] = g_type_info_get_ffi_type (arg_type);
g_base_info_unref ((GIBaseInfo *)arg_info);
g_base_info_unref ((GIBaseInfo *)arg_type);
}
@@ -272,20 +167,133 @@ g_callable_info_get_ffi_arg_types (GICallableInfo *callable_info)
* a #GICallableInfo
* Return value: the ffi_type for the return value
*/
ffi_type *
static ffi_type *
g_callable_info_get_ffi_return_type (GICallableInfo *callable_info)
{
GITypeInfo *return_type;
GITypeTag type_tag;
ffi_type *return_ffi_type;
g_return_val_if_fail (callable_info != NULL, NULL);
return_type = g_callable_info_get_return_type (callable_info);
type_tag = g_type_info_get_tag (return_type);
return_ffi_type = g_type_info_get_ffi_type (return_type);
g_base_info_unref((GIBaseInfo*)return_type);
return return_ffi_type;
}
return g_ir_ffi_get_ffi_type (type_tag);
/**
* g_function_info_prep_invoker:
* @info: A #GIFunctionInfo
* @invoker: Output invoker structure
* @error: A #GError
*
* Initialize the caller-allocated @invoker structure with a cache
* of information needed to invoke the C function corresponding to
* @info with the platform's default ABI.
*
* A primary intent of this function is that a dynamic structure allocated
* by a language binding could contain a #GIFunctionInvoker structure
* inside the binding's function mapping.
*/
gboolean
g_function_info_prep_invoker (GIFunctionInfo *info,
GIFunctionInvoker *invoker,
GError **error)
{
const char *symbol;
ffi_type *rtype;
ffi_type **atypes;
GITypeInfo *tinfo;
GIArgInfo *ainfo;
gboolean is_method;
gboolean throws;
gint n_args, n_invoke_args, i;
g_return_val_if_fail (info != NULL, FALSE);
g_return_val_if_fail (invoker != NULL, FALSE);
symbol = g_function_info_get_symbol ((GIFunctionInfo*) info);
if (!g_typelib_symbol (g_base_info_get_typelib((GIBaseInfo *) info),
symbol, &(invoker->native_address)))
{
g_set_error (error,
G_INVOKE_ERROR,
G_INVOKE_ERROR_SYMBOL_NOT_FOUND,
"Could not locate %s: %s", symbol, g_module_error ());
return FALSE;
}
is_method = (g_function_info_get_flags (info) & GI_FUNCTION_IS_METHOD) != 0
&& (g_function_info_get_flags (info) & GI_FUNCTION_IS_CONSTRUCTOR) == 0;
throws = g_function_info_get_flags (info) & GI_FUNCTION_THROWS;
tinfo = g_callable_info_get_return_type ((GICallableInfo *)info);
rtype = g_type_info_get_ffi_type (tinfo);
g_base_info_unref ((GIBaseInfo *)tinfo);
n_args = g_callable_info_get_n_args ((GICallableInfo *)info);
if (is_method)
n_invoke_args = n_args+1;
else
n_invoke_args = n_args;
if (throws)
/* Add an argument for the GError */
n_invoke_args ++;
/* TODO: avoid malloc here? */
atypes = g_malloc0 (sizeof (ffi_type*) * n_invoke_args);
if (is_method)
{
atypes[0] = &ffi_type_pointer;
}
for (i = 0; i < n_args; i++)
{
int offset = (is_method ? 1 : 0);
ainfo = g_callable_info_get_arg ((GICallableInfo *)info, i);
switch (g_arg_info_get_direction (ainfo))
{
case GI_DIRECTION_IN:
tinfo = g_arg_info_get_type (ainfo);
atypes[i+offset] = g_type_info_get_ffi_type (tinfo);
g_base_info_unref ((GIBaseInfo *)tinfo);
break;
case GI_DIRECTION_OUT:
case GI_DIRECTION_INOUT:
atypes[i+offset] = &ffi_type_pointer;
break;
default:
g_assert_not_reached ();
}
g_base_info_unref ((GIBaseInfo *)ainfo);
}
if (throws)
{
atypes[n_invoke_args - 1] = &ffi_type_pointer;
}
return ffi_prep_cif (&(invoker->cif), FFI_DEFAULT_ABI, n_invoke_args, rtype, atypes) == FFI_OK;
}
/**
* g_function_info_invoker_destroy:
* @invoker: A #GIFunctionInvoker
*
* Release all resources allocated for the internals of @invoker; callers
* are responsible for freeing any resources allocated for the structure
* itself however.
*/
void
g_function_invoker_destroy (GIFunctionInvoker *invoker)
{
g_free (invoker->cif.arg_types);
}
/**

23
girffi.h
View File

@@ -31,11 +31,24 @@ typedef void (*GIFFIClosureCallback) (ffi_cif *,
void **,
void *);
ffi_type * g_ir_ffi_get_ffi_type (GITypeTag tag);
GArgument * g_ir_ffi_convert_arguments (GICallableInfo *callable_info,
void **args);
ffi_type ** g_callable_info_get_ffi_arg_types (GICallableInfo *callable_info);
ffi_type * g_callable_info_get_ffi_return_type (GICallableInfo *callable_info);
typedef struct _GIFunctionInvoker GIFunctionInvoker;
struct _GIFunctionInvoker {
ffi_cif cif;
gpointer native_address;
gpointer padding[3];
};
ffi_type * g_type_info_get_ffi_type (GITypeInfo *info);
gboolean g_function_info_prep_invoker (GIFunctionInfo *info,
GIFunctionInvoker *invoker,
GError **error);
void g_function_invoker_destroy (GIFunctionInvoker *invoker);
ffi_closure * g_callable_info_prepare_closure (GICallableInfo *callable_info,
ffi_cif *cif,
GIFFIClosureCallback callback,

4
giroffsets.c
View File

@@ -18,7 +18,7 @@
* Boston, MA 02111-1307, USA.
*/
#include "girffi.h"
#include "girffi-private.h"
#include "girnode.h"
/* The C standard specifies that an enumeration can be any char or any signed
@@ -262,7 +262,7 @@ get_type_size_alignment (GIrNodeType *type,
}
else
{
type_ffi = g_ir_ffi_get_ffi_type (type->tag);
type_ffi = g_ir_ffi_get_ffi_type (type->tag, type->is_pointer);
if (type_ffi == &ffi_type_void)
{