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/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
/*
* Copyright (c) 2008-2010 litl, LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <config.h>
#include <gmodule.h>
#include <util/log.h>
#include "native.h"
#include "compat.h"
#include "jsapi-util.h"
typedef struct {
GjsDefineModuleFunc func;
GjsNativeFlags flags;
} GjsNativeModule;
static GHashTable *modules = NULL;
static void
native_module_free(void *data)
{
g_slice_free(GjsNativeModule, data);
}
void
gjs_register_native_module (const char *module_id,
GjsDefineModuleFunc func,
GjsNativeFlags flags)
{
GjsNativeModule *module;
if (modules == NULL) {
modules = g_hash_table_new_full(g_str_hash, g_str_equal,
g_free, native_module_free);
}
if (g_hash_table_lookup(modules, module_id) != NULL) {
g_warning("A second native module tried to register the same id '%s'",
module_id);
return;
}
module = g_slice_new(GjsNativeModule);
module->func = func;
module->flags = flags;
g_hash_table_replace(modules,
g_strdup(module_id),
module);
gjs_debug(GJS_DEBUG_NATIVE,
"Registered native JS module '%s'",
module_id);
}
static JSObject*
module_get_parent(JSContext *context,
JSObject *module_obj)
{
jsval value;
if (gjs_object_get_property(context, module_obj, "__parentModule__", &value) &&
value != JSVAL_NULL &&
JSVAL_IS_OBJECT(value)) {
return JSVAL_TO_OBJECT(value);
} else {
return NULL;
}
}
static char *
get_module_name(JSContext *context,
JSObject *module_obj,
jsval *tmp)
{
if (gjs_object_get_property(context, module_obj, "__moduleName__", tmp) &&
JSVAL_IS_STRING(*tmp))
return gjs_string_get_ascii(context, *tmp);
else
return NULL;
}
static GjsNativeModule *
lookup_native_module(JSContext *context,
JSObject *parent,
const char *name,
gboolean is_definition)
{
GjsNativeModule *native_module;
GString *module_id;
module_id = g_string_new(name);
while (parent != NULL) {
char *name;
jsval tmp;
name = get_module_name(context, parent, &tmp);
if (name != NULL) {
g_string_prepend_c(module_id, '.');
g_string_prepend(module_id, name);
g_free(name);
}
/* Move up to parent */
parent = module_get_parent(context, parent);
}
if (is_definition)
gjs_debug(GJS_DEBUG_NATIVE,
"Defining native module '%s'",
module_id->str);
if (modules != NULL)
native_module = g_hash_table_lookup(modules, module_id->str);
else
native_module = NULL;
if (native_module == NULL) {
if (is_definition) {
gjs_throw(context,
"No native module '%s' has registered itself",
module_id->str);
}
g_string_free(module_id, TRUE);
return NULL;
}
g_string_free(module_id, TRUE);
return native_module;
}
/**
* gjs_is_registered_native_module:
* @context:
* @parent: the parent object defining the namespace
* @name: name of the module
*
* Checks if a native module corresponding to @name has already
* been registered. This is used to check to see if a name is a
* builtin module without starting to try and load it.
*/
gboolean
gjs_is_registered_native_module(JSContext *context,
JSObject *parent,
const char *name)
{
GjsNativeModule *native_module;
native_module = lookup_native_module(context, parent, name, FALSE);
return native_module != NULL;
}
/**
* gjs_import_native_module:
* @context:
* @module_obj:
* @filename: filename or %NULL
* @flags_p:
*
* Imports a native module by g_module_open a shared library.
* If @filename is %NULL, do not dlopen, assume the library
* is already loaded in the modules hash table
*/
JSBool
gjs_import_native_module(JSContext *context,
JSObject *module_obj,
const char *filename,
GjsNativeFlags *flags_p)
{
GModule *gmodule = NULL;
GjsNativeModule *native_module;
JSObject *parent;
jsval tmp;
if (flags_p)
*flags_p = 0;
if (filename != NULL) {
/* Vital to load in global scope so any dependent libs
* are loaded into the main app. We don't want a second
* private copy of GTK or something.
*/
gmodule = g_module_open(filename, 0);
if (gmodule == NULL) {
gjs_throw(context,
"Failed to load '%s': %s",
filename, g_module_error());
return JS_FALSE;
}
}
/* dlopen() as a side effect should have registered us as
* a native module. We just have to reverse-engineer
* the module id from module_obj.
*/
{
char *module_name = get_module_name(context, module_obj, &tmp);
native_module = lookup_native_module (context,
module_get_parent(context, module_obj),
module_name,
TRUE);
g_free(module_name);
}
if (!native_module) {
if (gmodule)
g_module_close(gmodule);
return JS_FALSE;
}
if (flags_p)
*flags_p = native_module->flags;
if (gmodule) {
/* make the module resident, which makes the close() a no-op
* (basically we leak the module permanently)
*/
g_module_make_resident(gmodule);
g_module_close(gmodule);
}
if (native_module->flags & GJS_NATIVE_SUPPLIES_MODULE_OBJ) {
/* In this case we just throw away "module_obj" eventually,
* since the native module defines itself in the parent of
* module_obj directly.
*/
parent = module_get_parent(context, module_obj);
return (* native_module->func) (context, parent);
} else {
return (* native_module->func) (context, module_obj);
}
}
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