391 lines
11 KiB
C++
391 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
* vim: set ts=8 sts=4 et sw=4 tw=99:
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "builtin/WeakMapObject.h"
|
|
|
|
#include "jsapi.h"
|
|
#include "jscntxt.h"
|
|
|
|
#include "vm/SelfHosting.h"
|
|
|
|
#include "vm/Interpreter-inl.h"
|
|
|
|
using namespace js;
|
|
using namespace js::gc;
|
|
|
|
MOZ_ALWAYS_INLINE bool
|
|
IsWeakMap(HandleValue v)
|
|
{
|
|
return v.isObject() && v.toObject().is<WeakMapObject>();
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE bool
|
|
WeakMap_has_impl(JSContext* cx, const CallArgs& args)
|
|
{
|
|
MOZ_ASSERT(IsWeakMap(args.thisv()));
|
|
|
|
if (!args.get(0).isObject()) {
|
|
args.rval().setBoolean(false);
|
|
return true;
|
|
}
|
|
|
|
if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) {
|
|
JSObject* key = &args[0].toObject();
|
|
if (map->has(key)) {
|
|
args.rval().setBoolean(true);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
args.rval().setBoolean(false);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
js::WeakMap_has(JSContext* cx, unsigned argc, Value* vp)
|
|
{
|
|
CallArgs args = CallArgsFromVp(argc, vp);
|
|
return CallNonGenericMethod<IsWeakMap, WeakMap_has_impl>(cx, args);
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE bool
|
|
WeakMap_get_impl(JSContext* cx, const CallArgs& args)
|
|
{
|
|
MOZ_ASSERT(IsWeakMap(args.thisv()));
|
|
|
|
if (!args.get(0).isObject()) {
|
|
args.rval().setUndefined();
|
|
return true;
|
|
}
|
|
|
|
if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) {
|
|
JSObject* key = &args[0].toObject();
|
|
if (ObjectValueMap::Ptr ptr = map->lookup(key)) {
|
|
args.rval().set(ptr->value());
|
|
return true;
|
|
}
|
|
}
|
|
|
|
args.rval().setUndefined();
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
js::WeakMap_get(JSContext* cx, unsigned argc, Value* vp)
|
|
{
|
|
CallArgs args = CallArgsFromVp(argc, vp);
|
|
return CallNonGenericMethod<IsWeakMap, WeakMap_get_impl>(cx, args);
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE bool
|
|
WeakMap_delete_impl(JSContext* cx, const CallArgs& args)
|
|
{
|
|
MOZ_ASSERT(IsWeakMap(args.thisv()));
|
|
|
|
if (!args.get(0).isObject()) {
|
|
args.rval().setBoolean(false);
|
|
return true;
|
|
}
|
|
|
|
if (ObjectValueMap* map = args.thisv().toObject().as<WeakMapObject>().getMap()) {
|
|
JSObject* key = &args[0].toObject();
|
|
if (ObjectValueMap::Ptr ptr = map->lookup(key)) {
|
|
map->remove(ptr);
|
|
args.rval().setBoolean(true);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
args.rval().setBoolean(false);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
js::WeakMap_delete(JSContext* cx, unsigned argc, Value* vp)
|
|
{
|
|
CallArgs args = CallArgsFromVp(argc, vp);
|
|
return CallNonGenericMethod<IsWeakMap, WeakMap_delete_impl>(cx, args);
|
|
}
|
|
|
|
static bool
|
|
TryPreserveReflector(JSContext* cx, HandleObject obj)
|
|
{
|
|
if (obj->getClass()->isWrappedNative() ||
|
|
obj->getClass()->isDOMClass() ||
|
|
(obj->is<ProxyObject>() &&
|
|
obj->as<ProxyObject>().handler()->family() == GetDOMProxyHandlerFamily()))
|
|
{
|
|
MOZ_ASSERT(cx->runtime()->preserveWrapperCallback);
|
|
if (!cx->runtime()->preserveWrapperCallback(cx, obj)) {
|
|
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_WEAKMAP_KEY);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static MOZ_ALWAYS_INLINE bool
|
|
SetWeakMapEntryInternal(JSContext* cx, Handle<WeakMapObject*> mapObj,
|
|
HandleObject key, HandleValue value)
|
|
{
|
|
ObjectValueMap* map = mapObj->getMap();
|
|
if (!map) {
|
|
auto newMap = cx->make_unique<ObjectValueMap>(cx, mapObj.get());
|
|
if (!newMap)
|
|
return false;
|
|
if (!newMap->init()) {
|
|
JS_ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
map = newMap.release();
|
|
mapObj->setPrivate(map);
|
|
}
|
|
|
|
// Preserve wrapped native keys to prevent wrapper optimization.
|
|
if (!TryPreserveReflector(cx, key))
|
|
return false;
|
|
|
|
if (JSWeakmapKeyDelegateOp op = key->getClass()->extWeakmapKeyDelegateOp()) {
|
|
RootedObject delegate(cx, op(key));
|
|
if (delegate && !TryPreserveReflector(cx, delegate))
|
|
return false;
|
|
}
|
|
|
|
MOZ_ASSERT(key->compartment() == mapObj->compartment());
|
|
MOZ_ASSERT_IF(value.isObject(), value.toObject().compartment() == mapObj->compartment());
|
|
if (!map->put(key, value)) {
|
|
JS_ReportOutOfMemory(cx);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE bool
|
|
WeakMap_set_impl(JSContext* cx, const CallArgs& args)
|
|
{
|
|
MOZ_ASSERT(IsWeakMap(args.thisv()));
|
|
|
|
if (!args.get(0).isObject()) {
|
|
UniqueChars bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, args.get(0), nullptr);
|
|
if (!bytes)
|
|
return false;
|
|
JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT,
|
|
bytes.get());
|
|
return false;
|
|
}
|
|
|
|
RootedObject key(cx, &args[0].toObject());
|
|
Rooted<JSObject*> thisObj(cx, &args.thisv().toObject());
|
|
Rooted<WeakMapObject*> map(cx, &thisObj->as<WeakMapObject>());
|
|
|
|
if (!SetWeakMapEntryInternal(cx, map, key, args.get(1)))
|
|
return false;
|
|
args.rval().set(args.thisv());
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
js::WeakMap_set(JSContext* cx, unsigned argc, Value* vp)
|
|
{
|
|
CallArgs args = CallArgsFromVp(argc, vp);
|
|
return CallNonGenericMethod<IsWeakMap, WeakMap_set_impl>(cx, args);
|
|
}
|
|
|
|
JS_FRIEND_API(bool)
|
|
JS_NondeterministicGetWeakMapKeys(JSContext* cx, HandleObject objArg, MutableHandleObject ret)
|
|
{
|
|
RootedObject obj(cx, objArg);
|
|
obj = UncheckedUnwrap(obj);
|
|
if (!obj || !obj->is<WeakMapObject>()) {
|
|
ret.set(nullptr);
|
|
return true;
|
|
}
|
|
RootedObject arr(cx, NewDenseEmptyArray(cx));
|
|
if (!arr)
|
|
return false;
|
|
ObjectValueMap* map = obj->as<WeakMapObject>().getMap();
|
|
if (map) {
|
|
// Prevent GC from mutating the weakmap while iterating.
|
|
AutoSuppressGC suppress(cx);
|
|
for (ObjectValueMap::Base::Range r = map->all(); !r.empty(); r.popFront()) {
|
|
JS::ExposeObjectToActiveJS(r.front().key());
|
|
RootedObject key(cx, r.front().key());
|
|
if (!cx->compartment()->wrap(cx, &key))
|
|
return false;
|
|
if (!NewbornArrayPush(cx, arr, ObjectValue(*key)))
|
|
return false;
|
|
}
|
|
}
|
|
ret.set(arr);
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
WeakMap_mark(JSTracer* trc, JSObject* obj)
|
|
{
|
|
if (ObjectValueMap* map = obj->as<WeakMapObject>().getMap())
|
|
map->trace(trc);
|
|
}
|
|
|
|
static void
|
|
WeakMap_finalize(FreeOp* fop, JSObject* obj)
|
|
{
|
|
MOZ_ASSERT(fop->maybeOffMainThread());
|
|
if (ObjectValueMap* map = obj->as<WeakMapObject>().getMap()) {
|
|
#ifdef DEBUG
|
|
map->~ObjectValueMap();
|
|
memset(static_cast<void*>(map), 0xdc, sizeof(*map));
|
|
fop->free_(map);
|
|
#else
|
|
fop->delete_(map);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
JS_PUBLIC_API(JSObject*)
|
|
JS::NewWeakMapObject(JSContext* cx)
|
|
{
|
|
return NewBuiltinClassInstance(cx, &WeakMapObject::class_);
|
|
}
|
|
|
|
JS_PUBLIC_API(bool)
|
|
JS::IsWeakMapObject(JSObject* obj)
|
|
{
|
|
return obj->is<WeakMapObject>();
|
|
}
|
|
|
|
JS_PUBLIC_API(bool)
|
|
JS::GetWeakMapEntry(JSContext* cx, HandleObject mapObj, HandleObject key,
|
|
MutableHandleValue rval)
|
|
{
|
|
CHECK_REQUEST(cx);
|
|
assertSameCompartment(cx, key);
|
|
rval.setUndefined();
|
|
ObjectValueMap* map = mapObj->as<WeakMapObject>().getMap();
|
|
if (!map)
|
|
return true;
|
|
if (ObjectValueMap::Ptr ptr = map->lookup(key)) {
|
|
// Read barrier to prevent an incorrectly gray value from escaping the
|
|
// weak map. See the comment before UnmarkGrayChildren in gc/Marking.cpp
|
|
ExposeValueToActiveJS(ptr->value().get());
|
|
rval.set(ptr->value());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
JS_PUBLIC_API(bool)
|
|
JS::SetWeakMapEntry(JSContext* cx, HandleObject mapObj, HandleObject key,
|
|
HandleValue val)
|
|
{
|
|
CHECK_REQUEST(cx);
|
|
assertSameCompartment(cx, key, val);
|
|
Rooted<WeakMapObject*> rootedMap(cx, &mapObj->as<WeakMapObject>());
|
|
return SetWeakMapEntryInternal(cx, rootedMap, key, val);
|
|
}
|
|
|
|
static bool
|
|
WeakMap_construct(JSContext* cx, unsigned argc, Value* vp)
|
|
{
|
|
CallArgs args = CallArgsFromVp(argc, vp);
|
|
|
|
// ES6 draft rev 31 (15 Jan 2015) 23.3.1.1 step 1.
|
|
if (!ThrowIfNotConstructing(cx, args, "WeakMap"))
|
|
return false;
|
|
|
|
RootedObject newTarget(cx, &args.newTarget().toObject());
|
|
RootedObject obj(cx, CreateThis(cx, &WeakMapObject::class_, newTarget));
|
|
if (!obj)
|
|
return false;
|
|
|
|
// Steps 5-6, 11.
|
|
if (!args.get(0).isNullOrUndefined()) {
|
|
FixedInvokeArgs<1> args2(cx);
|
|
args2[0].set(args[0]);
|
|
|
|
RootedValue thisv(cx, ObjectValue(*obj));
|
|
if (!CallSelfHostedFunction(cx, cx->names().WeakMapConstructorInit, thisv, args2, args2.rval()))
|
|
return false;
|
|
}
|
|
|
|
args.rval().setObject(*obj);
|
|
return true;
|
|
}
|
|
|
|
static const ClassOps WeakMapObjectClassOps = {
|
|
nullptr, /* addProperty */
|
|
nullptr, /* delProperty */
|
|
nullptr, /* getProperty */
|
|
nullptr, /* setProperty */
|
|
nullptr, /* enumerate */
|
|
nullptr, /* resolve */
|
|
nullptr, /* mayResolve */
|
|
WeakMap_finalize,
|
|
nullptr, /* call */
|
|
nullptr, /* hasInstance */
|
|
nullptr, /* construct */
|
|
WeakMap_mark
|
|
};
|
|
|
|
const Class WeakMapObject::class_ = {
|
|
"WeakMap",
|
|
JSCLASS_HAS_PRIVATE |
|
|
JSCLASS_HAS_CACHED_PROTO(JSProto_WeakMap) |
|
|
JSCLASS_BACKGROUND_FINALIZE,
|
|
&WeakMapObjectClassOps
|
|
};
|
|
|
|
static const JSFunctionSpec weak_map_methods[] = {
|
|
JS_FN("has", WeakMap_has, 1, 0),
|
|
JS_FN("get", WeakMap_get, 1, 0),
|
|
JS_FN("delete", WeakMap_delete, 1, 0),
|
|
JS_FN("set", WeakMap_set, 2, 0),
|
|
JS_FS_END
|
|
};
|
|
|
|
static JSObject*
|
|
InitWeakMapClass(JSContext* cx, HandleObject obj, bool defineMembers)
|
|
{
|
|
MOZ_ASSERT(obj->isNative());
|
|
|
|
Handle<GlobalObject*> global = obj.as<GlobalObject>();
|
|
|
|
RootedPlainObject proto(cx, NewBuiltinClassInstance<PlainObject>(cx));
|
|
if (!proto)
|
|
return nullptr;
|
|
|
|
RootedFunction ctor(cx, GlobalObject::createConstructor(cx, WeakMap_construct,
|
|
cx->names().WeakMap, 0));
|
|
if (!ctor)
|
|
return nullptr;
|
|
|
|
if (!LinkConstructorAndPrototype(cx, ctor, proto))
|
|
return nullptr;
|
|
|
|
if (defineMembers) {
|
|
if (!DefinePropertiesAndFunctions(cx, proto, nullptr, weak_map_methods))
|
|
return nullptr;
|
|
if (!DefineToStringTag(cx, proto, cx->names().WeakMap))
|
|
return nullptr;
|
|
}
|
|
|
|
if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_WeakMap, ctor, proto))
|
|
return nullptr;
|
|
return proto;
|
|
}
|
|
|
|
JSObject*
|
|
js::InitWeakMapClass(JSContext* cx, HandleObject obj)
|
|
{
|
|
return InitWeakMapClass(cx, obj, true);
|
|
}
|
|
|
|
JSObject*
|
|
js::InitBareWeakMapCtor(JSContext* cx, HandleObject obj)
|
|
{
|
|
return InitWeakMapClass(cx, obj, false);
|
|
}
|
|
|