mirror of
https://github.com/mozilla/gecko-dev.git
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331 lines
10 KiB
C++
331 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsWrapperCacheInlines.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "jsapi.h"
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#include "js/friend/DOMProxy.h" // JS::DOMProxyShadowsResult, JS::ExpandoAndGeneration, JS::SetDOMProxyInformation
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#include "js/Object.h" // JS::GetCompartment
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using namespace JS;
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namespace mozilla::dom {
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jsid s_length_id = JSID_VOID;
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bool DefineStaticJSVals(JSContext* cx) {
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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 DOMProxyShadows(JSContext* cx,
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JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id) {
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using DOMProxyShadowsResult = JS::DOMProxyShadowsResult;
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JS::Rooted<JSObject*> expando(cx, DOMProxyHandler::GetExpandoObject(proxy));
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JS::Value v = js::GetProxyPrivate(proxy);
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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 DOMProxyShadowsResult::ShadowCheckFailed;
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if (hasOwn) {
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return isOverrideBuiltins
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? DOMProxyShadowsResult::ShadowsViaIndirectExpando
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: DOMProxyShadowsResult::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 DOMProxyShadowsResult::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 DOMProxyShadowsResult::ShadowCheckFailed;
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return hasOwn ? DOMProxyShadowsResult::Shadows
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: DOMProxyShadowsResult::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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SetDOMProxyInformation() {
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JS::SetDOMProxyInformation((const void*)&DOMProxyHandler::family,
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DOMProxyShadows,
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&RemoteObjectProxyBase::sCrossOriginProxyFamily);
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}
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};
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SetDOMProxyInformation gSetDOMProxyInformation;
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static inline void CheckExpandoObject(JSObject* proxy,
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const JS::Value& expando) {
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#ifdef DEBUG
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JSObject* obj = &expando.toObject();
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MOZ_ASSERT(!js::gc::EdgeNeedsSweepUnbarriered(&obj));
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MOZ_ASSERT(JS::GetCompartment(proxy) == JS::GetCompartment(obj));
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// When we create an expando object in EnsureExpandoObject below, we preserve
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// the wrapper. The wrapper is released when the object is unlinked, but we
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// should never call these functions after that point.
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nsISupports* native = UnwrapDOMObject<nsISupports>(proxy);
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nsWrapperCache* cache;
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// QueryInterface to nsWrapperCache will not GC.
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JS::AutoSuppressGCAnalysis suppress;
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CallQueryInterface(native, &cache);
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MOZ_ASSERT(cache->PreservingWrapper());
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#endif
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}
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static inline void CheckExpandoAndGeneration(
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JSObject* proxy, JS::ExpandoAndGeneration* expandoAndGeneration) {
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#ifdef DEBUG
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JS::Value value = expandoAndGeneration->expando;
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if (!value.isUndefined()) CheckExpandoObject(proxy, value);
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#endif
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}
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static inline void CheckDOMProxy(JSObject* proxy) {
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#ifdef DEBUG
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MOZ_ASSERT(IsDOMProxy(proxy), "expected a DOM proxy object");
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MOZ_ASSERT(!js::gc::EdgeNeedsSweepUnbarriered(&proxy));
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nsISupports* native = UnwrapDOMObject<nsISupports>(proxy);
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nsWrapperCache* cache;
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// QI to nsWrapperCache cannot GC for very non-obvious reasons; see
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// https://searchfox.org/mozilla-central/rev/55da592d85c2baf8d8818010c41d9738c97013d2/js/xpconnect/src/XPCWrappedJSClass.cpp#521,545-548
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JS::AutoSuppressGCAnalysis nogc;
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CallQueryInterface(native, &cache);
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MOZ_ASSERT(cache->GetWrapperPreserveColor() == proxy);
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#endif
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}
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// static
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JSObject* DOMProxyHandler::GetAndClearExpandoObject(JSObject* obj) {
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CheckDOMProxy(obj);
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JS::Value v = js::GetProxyPrivate(obj);
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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::SetProxyPrivate(obj, UndefinedValue());
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} else {
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auto* 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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expandoAndGeneration->expando = UndefinedValue();
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}
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CheckExpandoObject(obj, v);
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return &v.toObject();
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}
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// static
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JSObject* DOMProxyHandler::EnsureExpandoObject(JSContext* cx,
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JS::Handle<JSObject*> obj) {
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CheckDOMProxy(obj);
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JS::Value v = js::GetProxyPrivate(obj);
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if (v.isObject()) {
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CheckExpandoObject(obj, v);
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return &v.toObject();
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}
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JS::ExpandoAndGeneration* expandoAndGeneration = nullptr;
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if (!v.isUndefined()) {
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expandoAndGeneration =
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static_cast<JS::ExpandoAndGeneration*>(v.toPrivate());
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CheckExpandoAndGeneration(obj, expandoAndGeneration);
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if (expandoAndGeneration->expando.isObject()) {
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return &expandoAndGeneration->expando.toObject();
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}
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}
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JS::Rooted<JSObject*> expando(
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cx, 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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cache->PreserveWrapper(native);
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if (expandoAndGeneration) {
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expandoAndGeneration->expando.setObject(*expando);
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return expando;
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}
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js::SetProxyPrivate(obj, ObjectValue(*expando));
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return expando;
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}
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bool DOMProxyHandler::preventExtensions(JSContext* cx,
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JS::Handle<JSObject*> proxy,
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JS::ObjectOpResult& result) const {
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// always extensible per WebIDL
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return result.failCantPreventExtensions();
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}
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bool DOMProxyHandler::isExtensible(JSContext* cx, JS::Handle<JSObject*> proxy,
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bool* extensible) const {
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*extensible = true;
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return true;
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}
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bool BaseDOMProxyHandler::getOwnPropertyDescriptor(
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JSContext* cx, Handle<JSObject*> proxy, Handle<jsid> id,
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MutableHandle<Maybe<PropertyDescriptor>> desc) const {
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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 DOMProxyHandler::defineProperty(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id,
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Handle<PropertyDescriptor> desc,
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JS::ObjectOpResult& result,
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bool* done) const {
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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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*done = true;
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return true;
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}
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bool DOMProxyHandler::set(JSContext* cx, Handle<JSObject*> proxy,
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Handle<jsid> id, Handle<JS::Value> v,
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Handle<JS::Value> receiver,
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ObjectOpResult& result) const {
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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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Rooted<Maybe<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,
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result);
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}
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bool DOMProxyHandler::delete_(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id,
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JS::ObjectOpResult& result) const {
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JS::Rooted<JSObject*> expando(cx);
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if (!xpc::WrapperFactory::IsXrayWrapper(proxy) &&
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(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 BaseDOMProxyHandler::ownPropertyKeys(
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JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::MutableHandleVector<jsid> props) const {
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return ownPropNames(cx, proxy,
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JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, props);
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}
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bool BaseDOMProxyHandler::getPrototypeIfOrdinary(
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JSContext* cx, JS::Handle<JSObject*> proxy, bool* isOrdinary,
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JS::MutableHandle<JSObject*> proto) const {
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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 BaseDOMProxyHandler::getOwnEnumerablePropertyKeys(
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JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::MutableHandleVector<jsid> props) const {
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return ownPropNames(cx, proxy, JSITER_OWNONLY, props);
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}
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bool DOMProxyHandler::setCustom(JSContext* cx, JS::Handle<JSObject*> proxy,
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JS::Handle<jsid> id, JS::Handle<JS::Value> v,
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bool* done) const {
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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* DOMProxyHandler::GetExpandoObject(JSObject* obj) {
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CheckDOMProxy(obj);
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JS::Value v = js::GetProxyPrivate(obj);
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if (v.isObject()) {
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CheckExpandoObject(obj, v);
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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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auto* expandoAndGeneration =
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static_cast<JS::ExpandoAndGeneration*>(v.toPrivate());
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CheckExpandoAndGeneration(obj, expandoAndGeneration);
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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 ShadowingDOMProxyHandler::trace(JSTracer* trc, JSObject* proxy) const {
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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::GetProxyPrivate(proxy);
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MOZ_ASSERT(!v.isObject(), "Should not have expando object directly!");
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// The proxy's private slot is set when we allocate the proxy,
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// so it cannot be |undefined|.
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MOZ_ASSERT(!v.isUndefined());
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auto* 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 mozilla::dom
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