mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-25 22:01:30 +00:00
323 lines
9.1 KiB
C++
323 lines
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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 "mozilla/dom/DOMJSProxyHandler.h"
|
|
#include "xpcpublic.h"
|
|
#include "xpcprivate.h"
|
|
#include "XPCWrapper.h"
|
|
#include "WrapperFactory.h"
|
|
#include "nsDOMClassInfo.h"
|
|
#include "nsWrapperCacheInlines.h"
|
|
#include "mozilla/dom/BindingUtils.h"
|
|
|
|
#include "jsapi.h"
|
|
|
|
using namespace JS;
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
jsid s_length_id = JSID_VOID;
|
|
|
|
bool
|
|
DefineStaticJSVals(JSContext* cx)
|
|
{
|
|
return AtomizeAndPinJSString(cx, s_length_id, "length");
|
|
}
|
|
|
|
const char DOMProxyHandler::family = 0;
|
|
|
|
js::DOMProxyShadowsResult
|
|
DOMProxyShadows(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id)
|
|
{
|
|
JS::Rooted<JSObject*> expando(cx, DOMProxyHandler::GetExpandoObject(proxy));
|
|
JS::Value v = js::GetProxyExtra(proxy, JSPROXYSLOT_EXPANDO);
|
|
bool isOverrideBuiltins = !v.isObject() && !v.isUndefined();
|
|
if (expando) {
|
|
bool hasOwn;
|
|
if (!JS_AlreadyHasOwnPropertyById(cx, expando, id, &hasOwn))
|
|
return js::ShadowCheckFailed;
|
|
|
|
if (hasOwn) {
|
|
return isOverrideBuiltins ?
|
|
js::ShadowsViaIndirectExpando : js::ShadowsViaDirectExpando;
|
|
}
|
|
}
|
|
|
|
if (!isOverrideBuiltins) {
|
|
// Our expando, if any, didn't shadow, so we're not shadowing at all.
|
|
return js::DoesntShadow;
|
|
}
|
|
|
|
bool hasOwn;
|
|
if (!GetProxyHandler(proxy)->hasOwn(cx, proxy, id, &hasOwn))
|
|
return js::ShadowCheckFailed;
|
|
|
|
return hasOwn ? js::Shadows : js::DoesntShadowUnique;
|
|
}
|
|
|
|
// Store the information for the specialized ICs.
|
|
struct SetDOMProxyInformation
|
|
{
|
|
SetDOMProxyInformation() {
|
|
js::SetDOMProxyInformation((const void*) &DOMProxyHandler::family,
|
|
JSPROXYSLOT_EXPANDO, DOMProxyShadows);
|
|
}
|
|
};
|
|
|
|
SetDOMProxyInformation gSetDOMProxyInformation;
|
|
|
|
// static
|
|
JSObject*
|
|
DOMProxyHandler::GetAndClearExpandoObject(JSObject* obj)
|
|
{
|
|
MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
|
|
JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
|
|
if (v.isUndefined()) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (v.isObject()) {
|
|
js::SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, UndefinedValue());
|
|
xpc::ObjectScope(obj)->RemoveDOMExpandoObject(obj);
|
|
} else {
|
|
js::ExpandoAndGeneration* expandoAndGeneration =
|
|
static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
|
|
v = expandoAndGeneration->expando;
|
|
if (v.isUndefined()) {
|
|
return nullptr;
|
|
}
|
|
expandoAndGeneration->expando = UndefinedValue();
|
|
}
|
|
|
|
|
|
return &v.toObject();
|
|
}
|
|
|
|
// static
|
|
JSObject*
|
|
DOMProxyHandler::EnsureExpandoObject(JSContext* cx, JS::Handle<JSObject*> obj)
|
|
{
|
|
NS_ASSERTION(IsDOMProxy(obj), "expected a DOM proxy object");
|
|
JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
|
|
if (v.isObject()) {
|
|
return &v.toObject();
|
|
}
|
|
|
|
js::ExpandoAndGeneration* expandoAndGeneration;
|
|
if (!v.isUndefined()) {
|
|
expandoAndGeneration = static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
|
|
if (expandoAndGeneration->expando.isObject()) {
|
|
return &expandoAndGeneration->expando.toObject();
|
|
}
|
|
} else {
|
|
expandoAndGeneration = nullptr;
|
|
}
|
|
|
|
JS::Rooted<JSObject*> expando(cx,
|
|
JS_NewObjectWithGivenProto(cx, nullptr, nullptr));
|
|
if (!expando) {
|
|
return nullptr;
|
|
}
|
|
|
|
nsISupports* native = UnwrapDOMObject<nsISupports>(obj);
|
|
nsWrapperCache* cache;
|
|
CallQueryInterface(native, &cache);
|
|
if (expandoAndGeneration) {
|
|
cache->PreserveWrapper(native);
|
|
expandoAndGeneration->expando.setObject(*expando);
|
|
|
|
return expando;
|
|
}
|
|
|
|
if (!xpc::ObjectScope(obj)->RegisterDOMExpandoObject(obj)) {
|
|
return nullptr;
|
|
}
|
|
|
|
cache->SetPreservingWrapper(true);
|
|
js::SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, ObjectValue(*expando));
|
|
|
|
return expando;
|
|
}
|
|
|
|
bool
|
|
DOMProxyHandler::preventExtensions(JSContext* cx, JS::Handle<JSObject*> proxy,
|
|
JS::ObjectOpResult& result) const
|
|
{
|
|
// always extensible per WebIDL
|
|
return result.failCantPreventExtensions();
|
|
}
|
|
|
|
bool
|
|
DOMProxyHandler::isExtensible(JSContext *cx, JS::Handle<JSObject*> proxy, bool *extensible) const
|
|
{
|
|
*extensible = true;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
BaseDOMProxyHandler::getOwnPropertyDescriptor(JSContext* cx,
|
|
JS::Handle<JSObject*> proxy,
|
|
JS::Handle<jsid> id,
|
|
MutableHandle<PropertyDescriptor> desc) const
|
|
{
|
|
return getOwnPropDescriptor(cx, proxy, id, /* ignoreNamedProps = */ false,
|
|
desc);
|
|
}
|
|
|
|
bool
|
|
DOMProxyHandler::defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
|
|
Handle<PropertyDescriptor> desc,
|
|
JS::ObjectOpResult &result, bool *defined) const
|
|
{
|
|
if (desc.hasGetterObject() && desc.setter() == JS_StrictPropertyStub) {
|
|
return result.failGetterOnly();
|
|
}
|
|
|
|
if (xpc::WrapperFactory::IsXrayWrapper(proxy)) {
|
|
return result.succeed();
|
|
}
|
|
|
|
JS::Rooted<JSObject*> expando(cx, EnsureExpandoObject(cx, proxy));
|
|
if (!expando) {
|
|
return false;
|
|
}
|
|
|
|
if (!JS_DefinePropertyById(cx, expando, id, desc, result)) {
|
|
return false;
|
|
}
|
|
*defined = true;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
DOMProxyHandler::set(JSContext *cx, Handle<JSObject*> proxy, Handle<jsid> id,
|
|
Handle<JS::Value> v, Handle<JS::Value> receiver,
|
|
ObjectOpResult &result) const
|
|
{
|
|
MOZ_ASSERT(!xpc::WrapperFactory::IsXrayWrapper(proxy),
|
|
"Should not have a XrayWrapper here");
|
|
bool done;
|
|
if (!setCustom(cx, proxy, id, v, &done)) {
|
|
return false;
|
|
}
|
|
if (done) {
|
|
return result.succeed();
|
|
}
|
|
|
|
// Make sure to ignore our named properties when checking for own
|
|
// property descriptors for a set.
|
|
JS::Rooted<PropertyDescriptor> ownDesc(cx);
|
|
if (!getOwnPropDescriptor(cx, proxy, id, /* ignoreNamedProps = */ true,
|
|
&ownDesc)) {
|
|
return false;
|
|
}
|
|
return js::SetPropertyIgnoringNamedGetter(cx, proxy, id, v, receiver, ownDesc, result);
|
|
}
|
|
|
|
bool
|
|
DOMProxyHandler::delete_(JSContext* cx, JS::Handle<JSObject*> proxy,
|
|
JS::Handle<jsid> id, JS::ObjectOpResult &result) const
|
|
{
|
|
JS::Rooted<JSObject*> expando(cx);
|
|
if (!xpc::WrapperFactory::IsXrayWrapper(proxy) && (expando = GetExpandoObject(proxy))) {
|
|
return JS_DeletePropertyById(cx, expando, id, result);
|
|
}
|
|
|
|
return result.succeed();
|
|
}
|
|
|
|
bool
|
|
BaseDOMProxyHandler::watch(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
|
|
JS::Handle<JSObject*> callable) const
|
|
{
|
|
return js::WatchGuts(cx, proxy, id, callable);
|
|
}
|
|
|
|
bool
|
|
BaseDOMProxyHandler::unwatch(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id) const
|
|
{
|
|
return js::UnwatchGuts(cx, proxy, id);
|
|
}
|
|
|
|
bool
|
|
BaseDOMProxyHandler::ownPropertyKeys(JSContext* cx,
|
|
JS::Handle<JSObject*> proxy,
|
|
JS::AutoIdVector& props) const
|
|
{
|
|
return ownPropNames(cx, proxy, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, props);
|
|
}
|
|
|
|
bool
|
|
BaseDOMProxyHandler::getPrototypeIfOrdinary(JSContext* cx, JS::Handle<JSObject*> proxy,
|
|
bool* isOrdinary,
|
|
JS::MutableHandle<JSObject*> proto) const
|
|
{
|
|
*isOrdinary = true;
|
|
proto.set(GetStaticPrototype(proxy));
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
BaseDOMProxyHandler::getOwnEnumerablePropertyKeys(JSContext* cx,
|
|
JS::Handle<JSObject*> proxy,
|
|
JS::AutoIdVector& props) const
|
|
{
|
|
return ownPropNames(cx, proxy, JSITER_OWNONLY, props);
|
|
}
|
|
|
|
bool
|
|
DOMProxyHandler::setCustom(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
|
|
JS::Handle<JS::Value> v, bool *done) const
|
|
{
|
|
*done = false;
|
|
return true;
|
|
}
|
|
|
|
//static
|
|
JSObject *
|
|
DOMProxyHandler::GetExpandoObject(JSObject *obj)
|
|
{
|
|
MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
|
|
JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
|
|
if (v.isObject()) {
|
|
return &v.toObject();
|
|
}
|
|
|
|
if (v.isUndefined()) {
|
|
return nullptr;
|
|
}
|
|
|
|
js::ExpandoAndGeneration* expandoAndGeneration =
|
|
static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
|
|
v = expandoAndGeneration->expando;
|
|
return v.isUndefined() ? nullptr : &v.toObject();
|
|
}
|
|
|
|
void
|
|
ShadowingDOMProxyHandler::trace(JSTracer* trc, JSObject* proxy) const
|
|
{
|
|
DOMProxyHandler::trace(trc, proxy);
|
|
|
|
MOZ_ASSERT(IsDOMProxy(proxy), "expected a DOM proxy object");
|
|
JS::Value v = js::GetProxyExtra(proxy, JSPROXYSLOT_EXPANDO);
|
|
MOZ_ASSERT(!v.isObject(), "Should not have expando object directly!");
|
|
|
|
if (v.isUndefined()) {
|
|
// This can happen if we GC while creating our object, before we get a
|
|
// chance to set up its JSPROXYSLOT_EXPANDO slot.
|
|
return;
|
|
}
|
|
|
|
js::ExpandoAndGeneration* expandoAndGeneration =
|
|
static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
|
|
JS::TraceEdge(trc, &expandoAndGeneration->expando,
|
|
"Shadowing DOM proxy expando");
|
|
}
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|