gecko-dev/dom/workers/ChromeWorkerScope.cpp

148 строки
4.4 KiB
C++

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Web Workers.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Turner <bent.mozilla@gmail.com> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "ChromeWorkerScope.h"
#include "jsapi.h"
#include "jscntxt.h"
#include "nsXPCOM.h"
#include "nsNativeCharsetUtils.h"
#include "nsStringGlue.h"
#include "WorkerPrivate.h"
#define CTYPES_STR "ctypes"
USING_WORKERS_NAMESPACE
namespace {
#ifdef BUILD_CTYPES
char*
UnicodeToNative(JSContext* aCx, const jschar* aSource, size_t aSourceLen)
{
nsDependentString unicode(aSource, aSourceLen);
nsCAutoString native;
if (NS_FAILED(NS_CopyUnicodeToNative(unicode, native))) {
JS_ReportError(aCx, "Could not convert string to native charset!");
return nsnull;
}
char* result = static_cast<char*>(JS_malloc(aCx, native.Length() + 1));
if (!result) {
return nsnull;
}
memcpy(result, native.get(), native.Length());
result[native.Length()] = 0;
return result;
}
JSCTypesCallbacks gCTypesCallbacks = {
UnicodeToNative
};
JSBool
CTypesLazyGetter(JSContext* aCx, JSObject* aObj, jsid aId, jsval* aVp)
{
NS_ASSERTION(JS_GetGlobalObject(aCx) == aObj, "Not a global object!");
NS_ASSERTION(JSID_IS_STRING(aId), "Bad id!");
NS_ASSERTION(JS_FlatStringEqualsAscii(JSID_TO_FLAT_STRING(aId), CTYPES_STR),
"Bad id!");
WorkerPrivate* worker = GetWorkerPrivateFromContext(aCx);
NS_ASSERTION(worker->IsChromeWorker(), "This should always be true!");
if (!worker->DisableMemoryReporter()) {
return false;
}
jsval ctypes;
return JS_DeletePropertyById(aCx, aObj, aId) &&
JS_InitCTypesClass(aCx, aObj) &&
JS_GetPropertyById(aCx, aObj, aId, &ctypes) &&
JS_SetCTypesCallbacks(aCx, JSVAL_TO_OBJECT(ctypes),
&gCTypesCallbacks) &&
JS_GetPropertyById(aCx, aObj, aId, aVp);
}
#endif
inline bool
DefineCTypesLazyGetter(JSContext* aCx, JSObject* aGlobal)
{
#ifdef BUILD_CTYPES
{
JSString* ctypesStr = JS_InternString(aCx, CTYPES_STR);
if (!ctypesStr) {
return false;
}
jsid ctypesId = INTERNED_STRING_TO_JSID(aCx, ctypesStr);
// We use a lazy getter here to let us unregister the blocking memory
// reporter since ctypes can easily block the worker thread and we can
// deadlock. Remove once bug 673323 is fixed.
if (!JS_DefinePropertyById(aCx, aGlobal, ctypesId, JSVAL_VOID,
CTypesLazyGetter, NULL, 0)) {
return false;
}
}
#endif
return true;
}
} // anonymous namespace
BEGIN_WORKERS_NAMESPACE
namespace chromeworker {
bool
DefineChromeWorkerFunctions(JSContext* aCx, JSObject* aGlobal)
{
// Currently ctypes is the only special property given to ChromeWorkers.
return DefineCTypesLazyGetter(aCx, aGlobal);
}
} // namespace chromeworker
END_WORKERS_NAMESPACE