353 lines
10 KiB
C++
353 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/DOMJSProxyHandler.h"
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#include "xpcpublic.h"
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#include "xpcprivate.h"
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#include "XPCWrapper.h"
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#include "WrapperFactory.h"
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#include "nsDOMClassInfo.h"
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#include "nsWrapperCacheInlines.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "jsapi.h"
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using namespace JS;
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namespace mozilla {
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namespace dom {
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jsid s_length_id = JSID_VOID;
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bool
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DefineStaticJSVals(JSContext* cx)
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{
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return AtomizeAndPinJSString(cx, s_length_id, "length");
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}
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const char DOMProxyHandler::family = 0;
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js::DOMProxyShadowsResult
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DOMProxyShadows(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id)
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{
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JS::Rooted<JSObject*> expando(cx, DOMProxyHandler::GetExpandoObject(proxy));
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JS::Value v = js::GetProxyExtra(proxy, JSPROXYSLOT_EXPANDO);
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bool isOverrideBuiltins = !v.isObject() && !v.isUndefined();
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if (expando) {
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bool hasOwn;
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if (!JS_AlreadyHasOwnPropertyById(cx, expando, id, &hasOwn))
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return js::ShadowCheckFailed;
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if (hasOwn) {
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return isOverrideBuiltins ?
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js::ShadowsViaIndirectExpando : js::ShadowsViaDirectExpando;
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}
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}
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if (!isOverrideBuiltins) {
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// Our expando, if any, didn't shadow, so we're not shadowing at all.
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return js::DoesntShadow;
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}
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bool hasOwn;
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if (!GetProxyHandler(proxy)->hasOwn(cx, proxy, id, &hasOwn))
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return js::ShadowCheckFailed;
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return hasOwn ? js::Shadows : js::DoesntShadowUnique;
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}
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// Store the information for the specialized ICs.
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struct SetDOMProxyInformation
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{
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SetDOMProxyInformation() {
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js::SetDOMProxyInformation((const void*) &DOMProxyHandler::family,
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JSPROXYSLOT_EXPANDO, DOMProxyShadows);
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}
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};
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SetDOMProxyInformation gSetDOMProxyInformation;
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// static
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void
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DOMProxyHandler::ClearExternalRefsForWrapperRelease(JSObject* obj)
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{
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MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
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if (v.isUndefined()) {
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// No expando.
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return;
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}
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// See EnsureExpandoObject for the work we're trying to undo here.
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if (v.isObject()) {
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// Drop us from the DOM expando hashtable. Don't worry about clearing our
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// slot reference to the expando; we're about to die anyway.
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xpc::ObjectScope(obj)->RemoveDOMExpandoObject(obj);
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return;
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}
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// Prevent having a dangling pointer to our expando from the
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// ExpandoAndGeneration.
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js::ExpandoAndGeneration* expandoAndGeneration =
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static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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expandoAndGeneration->expando = UndefinedValue();
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}
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// static
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JSObject*
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DOMProxyHandler::GetAndClearExpandoObject(JSObject* obj)
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{
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MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
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if (v.isUndefined()) {
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return nullptr;
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}
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if (v.isObject()) {
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js::SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, UndefinedValue());
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xpc::ObjectScope(obj)->RemoveDOMExpandoObject(obj);
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} else {
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js::ExpandoAndGeneration* expandoAndGeneration =
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static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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v = expandoAndGeneration->expando;
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if (v.isUndefined()) {
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return nullptr;
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}
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// We have to expose v to active JS here. The reason for that is that we
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// might be in the middle of a GC right now. If our proxy hasn't been
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// traced yet, when it _does_ get traced it won't trace the expando, since
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// we're breaking that link. But the Rooted we're presumably being placed
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// into is also not going to trace us, because Rooted marking is done at
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// the very beginning of the GC. In that situation, we need to manually
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// mark the expando as live here. JS::ExposeValueToActiveJS will do just
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// that for us.
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//
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// We don't need to do this in the non-expandoAndGeneration case, because
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// in that case our value is stored in a slot and slots will already mark
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// the old thing live when the value in the slot changes.
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JS::ExposeValueToActiveJS(v);
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expandoAndGeneration->expando = UndefinedValue();
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}
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return &v.toObject();
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}
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// static
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JSObject*
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DOMProxyHandler::EnsureExpandoObject(JSContext* cx, JS::Handle<JSObject*> obj)
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{
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NS_ASSERTION(IsDOMProxy(obj), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
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if (v.isObject()) {
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return &v.toObject();
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}
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js::ExpandoAndGeneration* expandoAndGeneration;
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if (!v.isUndefined()) {
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expandoAndGeneration = static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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if (expandoAndGeneration->expando.isObject()) {
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return &expandoAndGeneration->expando.toObject();
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}
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} else {
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expandoAndGeneration = nullptr;
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}
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JS::Rooted<JSObject*> expando(cx,
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JS_NewObjectWithGivenProto(cx, nullptr, nullptr));
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if (!expando) {
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return nullptr;
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}
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nsISupports* native = UnwrapDOMObject<nsISupports>(obj);
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nsWrapperCache* cache;
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CallQueryInterface(native, &cache);
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if (!cache) {
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return expando;
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}
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if (expandoAndGeneration) {
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cache->PreserveWrapper(native);
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expandoAndGeneration->expando.setObject(*expando);
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return expando;
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}
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if (!xpc::ObjectScope(obj)->RegisterDOMExpandoObject(obj)) {
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return nullptr;
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}
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cache->SetPreservingWrapper(true);
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js::SetProxyExtra(obj, JSPROXYSLOT_EXPANDO, ObjectValue(*expando));
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return expando;
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}
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bool
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DOMProxyHandler::preventExtensions(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::ObjectOpResult& result) const
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{
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// always extensible per WebIDL
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return result.failCantPreventExtensions();
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}
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bool
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DOMProxyHandler::isExtensible(JSContext *cx, JS::Handle<JSObject*> proxy, bool *extensible) const
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{
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*extensible = true;
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return true;
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}
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bool
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BaseDOMProxyHandler::getOwnPropertyDescriptor(JSContext* cx,
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JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id,
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MutableHandle<PropertyDescriptor> desc) const
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{
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return getOwnPropDescriptor(cx, proxy, id, /* ignoreNamedProps = */ false,
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desc);
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}
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bool
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DOMProxyHandler::defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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Handle<PropertyDescriptor> desc,
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JS::ObjectOpResult &result, bool *defined) const
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{
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if (desc.hasGetterObject() && desc.setter() == JS_StrictPropertyStub) {
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return result.failGetterOnly();
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}
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if (xpc::WrapperFactory::IsXrayWrapper(proxy)) {
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return result.succeed();
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}
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JS::Rooted<JSObject*> expando(cx, EnsureExpandoObject(cx, proxy));
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if (!expando) {
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return false;
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}
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if (!JS_DefinePropertyById(cx, expando, id, desc, result)) {
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return false;
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}
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*defined = true;
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return true;
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}
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bool
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DOMProxyHandler::set(JSContext *cx, Handle<JSObject*> proxy, Handle<jsid> id,
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Handle<JS::Value> v, Handle<JS::Value> receiver,
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ObjectOpResult &result) const
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{
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MOZ_ASSERT(!xpc::WrapperFactory::IsXrayWrapper(proxy),
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"Should not have a XrayWrapper here");
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bool done;
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if (!setCustom(cx, proxy, id, v, &done)) {
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return false;
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}
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if (done) {
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return result.succeed();
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}
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// Make sure to ignore our named properties when checking for own
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// property descriptors for a set.
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JS::Rooted<PropertyDescriptor> ownDesc(cx);
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if (!getOwnPropDescriptor(cx, proxy, id, /* ignoreNamedProps = */ true,
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&ownDesc)) {
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return false;
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}
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return js::SetPropertyIgnoringNamedGetter(cx, proxy, id, v, receiver, ownDesc, result);
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}
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bool
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DOMProxyHandler::delete_(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id, JS::ObjectOpResult &result) const
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{
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JS::Rooted<JSObject*> expando(cx);
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if (!xpc::WrapperFactory::IsXrayWrapper(proxy) && (expando = GetExpandoObject(proxy))) {
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return JS_DeletePropertyById(cx, expando, id, result);
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}
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return result.succeed();
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}
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bool
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BaseDOMProxyHandler::ownPropertyKeys(JSContext* cx,
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JS::Handle<JSObject*> proxy,
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JS::AutoIdVector& props) const
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{
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return ownPropNames(cx, proxy, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, props);
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}
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bool
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BaseDOMProxyHandler::getPrototypeIfOrdinary(JSContext* cx, JS::Handle<JSObject*> proxy,
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bool* isOrdinary,
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JS::MutableHandle<JSObject*> proto) const
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{
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*isOrdinary = true;
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proto.set(GetStaticPrototype(proxy));
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return true;
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}
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bool
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BaseDOMProxyHandler::getOwnEnumerablePropertyKeys(JSContext* cx,
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JS::Handle<JSObject*> proxy,
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JS::AutoIdVector& props) const
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{
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return ownPropNames(cx, proxy, JSITER_OWNONLY, props);
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}
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bool
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DOMProxyHandler::setCustom(JSContext* cx, JS::Handle<JSObject*> proxy, JS::Handle<jsid> id,
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JS::Handle<JS::Value> v, bool *done) const
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{
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*done = false;
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return true;
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}
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//static
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JSObject *
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DOMProxyHandler::GetExpandoObject(JSObject *obj)
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{
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MOZ_ASSERT(IsDOMProxy(obj), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(obj, JSPROXYSLOT_EXPANDO);
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if (v.isObject()) {
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return &v.toObject();
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}
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if (v.isUndefined()) {
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return nullptr;
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}
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js::ExpandoAndGeneration* expandoAndGeneration =
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static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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v = expandoAndGeneration->expando;
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return v.isUndefined() ? nullptr : &v.toObject();
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}
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void
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ShadowingDOMProxyHandler::trace(JSTracer* trc, JSObject* proxy) const
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{
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DOMProxyHandler::trace(trc, proxy);
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MOZ_ASSERT(IsDOMProxy(proxy), "expected a DOM proxy object");
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JS::Value v = js::GetProxyExtra(proxy, JSPROXYSLOT_EXPANDO);
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MOZ_ASSERT(!v.isObject(), "Should not have expando object directly!");
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if (v.isUndefined()) {
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// This can happen if we GC while creating our object, before we get a
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// chance to set up its JSPROXYSLOT_EXPANDO slot.
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return;
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}
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js::ExpandoAndGeneration* expandoAndGeneration =
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static_cast<js::ExpandoAndGeneration*>(v.toPrivate());
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JS::TraceEdge(trc, &expandoAndGeneration->expando,
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"Shadowing DOM proxy expando");
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}
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} // namespace dom
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} // namespace mozilla
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