https://github.com/mozilla/gecko-dev
Tip revision: 56a44f24366557e5532147cf28cd14f306f47c46 authored by Mats Palmgren on 31 May 2012, 18:03:59 UTC
Bug 759788: hold a strong ref to the nsPluginInstanceOwner in DoStopPlugin to avoid crashes, r=bsmedberg, a=akeybl
Bug 759788: hold a strong ref to the nsPluginInstanceOwner in DoStopPlugin to avoid crashes, r=bsmedberg, a=akeybl
Tip revision: 56a44f2
jsweakmap.cpp
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99:
*
* ***** 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 Mozilla SpiderMonkey JavaScript 1.9 code, released
* May 28, 2008.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Andreas Gal <gal@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 <string.h>
#include "jsapi.h"
#include "jscntxt.h"
#include "jsfriendapi.h"
#include "jsgc.h"
#include "jsobj.h"
#include "jsgcmark.h"
#include "jsweakmap.h"
#include "vm/GlobalObject.h"
#include "jsgcinlines.h"
#include "jsobjinlines.h"
#include "vm/MethodGuard-inl.h"
using namespace js;
namespace js {
bool
WeakMapBase::markAllIteratively(JSTracer *tracer)
{
bool markedAny = false;
JSRuntime *rt = tracer->runtime;
for (WeakMapBase *m = rt->gcWeakMapList; m; m = m->next) {
if (m->markIteratively(tracer))
markedAny = true;
}
return markedAny;
}
void
WeakMapBase::sweepAll(JSTracer *tracer)
{
JSRuntime *rt = tracer->runtime;
for (WeakMapBase *m = rt->gcWeakMapList; m; m = m->next)
m->sweep(tracer);
}
void
WeakMapBase::traceAllMappings(WeakMapTracer *tracer)
{
JSRuntime *rt = tracer->runtime;
for (WeakMapBase *m = rt->gcWeakMapList; m; m = m->next)
m->traceMappings(tracer);
}
void
WeakMapBase::resetWeakMapList(JSRuntime *rt)
{
JS_ASSERT(WeakMapNotInList != NULL);
WeakMapBase *m = rt->gcWeakMapList;
rt->gcWeakMapList = NULL;
while (m) {
WeakMapBase *n = m->next;
m->next = WeakMapNotInList;
m = n;
}
}
bool
WeakMapBase::saveWeakMapList(JSRuntime *rt, WeakMapVector &vector)
{
WeakMapBase *m = rt->gcWeakMapList;
while (m) {
if (!vector.append(m))
return false;
m = m->next;
}
return true;
}
void
WeakMapBase::restoreWeakMapList(JSRuntime *rt, WeakMapVector &vector)
{
JS_ASSERT(!rt->gcWeakMapList);
for (WeakMapBase **p = vector.begin(); p != vector.end(); p++) {
WeakMapBase *m = *p;
JS_ASSERT(m->next == WeakMapNotInList);
m->next = rt->gcWeakMapList;
rt->gcWeakMapList = m;
}
}
} /* namespace js */
typedef WeakMap<HeapPtr<JSObject>, HeapValue> ObjectValueMap;
static ObjectValueMap *
GetObjectMap(JSObject *obj)
{
JS_ASSERT(obj->isWeakMap());
return (ObjectValueMap *)obj->getPrivate();
}
static JSObject *
GetKeyArg(JSContext *cx, CallArgs &args)
{
Value *vp = &args[0];
if (vp->isPrimitive()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
return NULL;
}
JSObject &key = vp->toObject();
// If the key is from another compartment, and we store the wrapper as the key
// the wrapper might be GC-ed since it is not strong referenced (Bug 673468).
// To avoid this we always use the unwrapped object as the key instead of its
// security wrapper. This also means that if the keys are ever exposed they must
// be re-wrapped (see: JS_NondeterministicGetWeakMapKeys).
return JS_UnwrapObject(&key);
}
static JSBool
WeakMap_has(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
bool ok;
JSObject *obj = NonGenericMethodGuard(cx, args, WeakMap_has, &WeakMapClass, &ok);
if (!obj)
return ok;
if (args.length() < 1) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"WeakMap.has", "0", "s");
return false;
}
JSObject *key = GetKeyArg(cx, args);
if (!key)
return false;
ObjectValueMap *map = GetObjectMap(obj);
if (map) {
ObjectValueMap::Ptr ptr = map->lookup(key);
if (ptr) {
args.rval() = BooleanValue(true);
return true;
}
}
args.rval() = BooleanValue(false);
return true;
}
static JSBool
WeakMap_get(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
bool ok;
JSObject *obj = NonGenericMethodGuard(cx, args, WeakMap_get, &WeakMapClass, &ok);
if (!obj)
return ok;
if (args.length() < 1) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"WeakMap.get", "0", "s");
return false;
}
JSObject *key = GetKeyArg(cx, args);
if (!key)
return false;
ObjectValueMap *map = GetObjectMap(obj);
if (map) {
ObjectValueMap::Ptr ptr = map->lookup(key);
if (ptr) {
args.rval() = ptr->value;
return true;
}
}
args.rval() = (args.length() > 1) ? args[1] : UndefinedValue();
return true;
}
static JSBool
WeakMap_delete(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
bool ok;
JSObject *obj = NonGenericMethodGuard(cx, args, WeakMap_delete, &WeakMapClass, &ok);
if (!obj)
return ok;
if (args.length() < 1) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"WeakMap.delete", "0", "s");
return false;
}
JSObject *key = GetKeyArg(cx, args);
if (!key)
return false;
ObjectValueMap *map = GetObjectMap(obj);
if (map) {
ObjectValueMap::Ptr ptr = map->lookup(key);
if (ptr) {
map->remove(ptr);
args.rval() = BooleanValue(true);
return true;
}
}
args.rval() = BooleanValue(false);
return true;
}
static JSBool
WeakMap_set(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
bool ok;
JSObject *obj = NonGenericMethodGuard(cx, args, WeakMap_set, &WeakMapClass, &ok);
if (!obj)
return ok;
if (args.length() < 1) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"WeakMap.set", "0", "s");
return false;
}
JSObject *key = GetKeyArg(cx, args);
if (!key)
return false;
Value value = (args.length() > 1) ? args[1] : UndefinedValue();
ObjectValueMap *map = GetObjectMap(obj);
if (!map) {
map = cx->new_<ObjectValueMap>(cx, obj);
if (!map->init()) {
cx->delete_(map);
goto out_of_memory;
}
obj->setPrivate(map);
}
if (!map->put(key, value))
goto out_of_memory;
// Preserve wrapped native keys to prevent wrapper optimization.
if (key->getClass()->ext.isWrappedNative) {
if (!cx->runtime->preserveWrapperCallback ||
!cx->runtime->preserveWrapperCallback(cx, key)) {
JS_ReportWarning(cx, "Failed to preserve wrapper of wrapped native weak map key.");
}
}
args.rval().setUndefined();
return true;
out_of_memory:
JS_ReportOutOfMemory(cx);
return false;
}
JS_FRIEND_API(JSBool)
JS_NondeterministicGetWeakMapKeys(JSContext *cx, JSObject *obj, JSObject **ret)
{
if (!obj || !obj->isWeakMap()) {
*ret = NULL;
return true;
}
JSObject *arr = NewDenseEmptyArray(cx);
if (!arr)
return false;
ObjectValueMap *map = GetObjectMap(obj);
if (map) {
for (ObjectValueMap::Range r = map->nondeterministicAll(); !r.empty(); r.popFront()) {
JSObject *key = r.front().key;
// Re-wrapping the key (see comment of GetKeyArg)
if (!JS_WrapObject(cx, &key))
return false;
if (!js_NewbornArrayPush(cx, arr, ObjectValue(*key)))
return false;
}
}
*ret = arr;
return true;
}
static void
WeakMap_mark(JSTracer *trc, JSObject *obj)
{
if (ObjectValueMap *map = GetObjectMap(obj))
map->trace(trc);
}
static void
WeakMap_finalize(JSContext *cx, JSObject *obj)
{
if (ObjectValueMap *map = GetObjectMap(obj)) {
map->check();
#ifdef DEBUG
map->~ObjectValueMap();
memset(static_cast<void *>(map), 0xdc, sizeof(*map));
cx->free_(map);
#else
cx->delete_(map);
#endif
}
}
static JSBool
WeakMap_construct(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj = NewBuiltinClassInstance(cx, &WeakMapClass);
if (!obj)
return false;
vp->setObject(*obj);
return true;
}
Class js::WeakMapClass = {
"WeakMap",
JSCLASS_HAS_PRIVATE | JSCLASS_IMPLEMENTS_BARRIERS |
JSCLASS_HAS_CACHED_PROTO(JSProto_WeakMap),
JS_PropertyStub, /* addProperty */
JS_PropertyStub, /* delProperty */
JS_PropertyStub, /* getProperty */
JS_StrictPropertyStub, /* setProperty */
JS_EnumerateStub,
JS_ResolveStub,
JS_ConvertStub,
WeakMap_finalize,
NULL, /* checkAccess */
NULL, /* call */
NULL, /* construct */
NULL, /* xdrObject */
WeakMap_mark
};
static JSFunctionSpec weak_map_methods[] = {
JS_FN("has", WeakMap_has, 1, 0),
JS_FN("get", WeakMap_get, 2, 0),
JS_FN("delete", WeakMap_delete, 1, 0),
JS_FN("set", WeakMap_set, 2, 0),
JS_FS_END
};
JSObject *
js_InitWeakMapClass(JSContext *cx, JSObject *obj)
{
JS_ASSERT(obj->isNative());
GlobalObject *global = &obj->asGlobal();
JSObject *weakMapProto = global->createBlankPrototype(cx, &WeakMapClass);
if (!weakMapProto)
return NULL;
JSFunction *ctor = global->createConstructor(cx, WeakMap_construct, &WeakMapClass,
CLASS_ATOM(cx, WeakMap), 0);
if (!ctor)
return NULL;
if (!LinkConstructorAndPrototype(cx, ctor, weakMapProto))
return NULL;
if (!DefinePropertiesAndBrand(cx, weakMapProto, NULL, weak_map_methods))
return NULL;
if (!DefineConstructorAndPrototype(cx, global, JSProto_WeakMap, ctor, weakMapProto))
return NULL;
return weakMapProto;
}