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-rw-r--r--js/src/proxy/DeadObjectProxy.cpp156
1 files changed, 156 insertions, 0 deletions
diff --git a/js/src/proxy/DeadObjectProxy.cpp b/js/src/proxy/DeadObjectProxy.cpp
new file mode 100644
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+++ b/js/src/proxy/DeadObjectProxy.cpp
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+/* -*- 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 "proxy/DeadObjectProxy.h"
+
+#include "js/ErrorReport.h" // JS_ReportErrorNumberASCII
+#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
+#include "vm/JSFunction.h" // XXXefaust Bug 1064662
+#include "vm/ProxyObject.h"
+
+#include "vm/JSObject-inl.h"
+
+using namespace js;
+
+const DeadObjectProxy DeadObjectProxy::singleton;
+const char DeadObjectProxy::family = 0;
+
+static void ReportDead(JSContext* cx) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_DEAD_OBJECT);
+}
+
+bool DeadObjectProxy::getOwnPropertyDescriptor(
+ JSContext* cx, HandleObject wrapper, HandleId id,
+ MutableHandle<mozilla::Maybe<PropertyDescriptor>> desc) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::defineProperty(JSContext* cx, HandleObject wrapper,
+ HandleId id,
+ Handle<PropertyDescriptor> desc,
+ ObjectOpResult& result) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::ownPropertyKeys(JSContext* cx, HandleObject wrapper,
+ MutableHandleIdVector props) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::delete_(JSContext* cx, HandleObject wrapper, HandleId id,
+ ObjectOpResult& result) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::getPrototype(JSContext* cx, HandleObject proxy,
+ MutableHandleObject protop) const {
+ protop.set(nullptr);
+ return true;
+}
+
+bool DeadObjectProxy::getPrototypeIfOrdinary(JSContext* cx, HandleObject proxy,
+ bool* isOrdinary,
+ MutableHandleObject protop) const {
+ *isOrdinary = false;
+ return true;
+}
+
+bool DeadObjectProxy::preventExtensions(JSContext* cx, HandleObject proxy,
+ ObjectOpResult& result) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::isExtensible(JSContext* cx, HandleObject proxy,
+ bool* extensible) const {
+ // This is kind of meaningless, but dead-object semantics aside,
+ // [[Extensible]] always being true is consistent with other proxy types.
+ *extensible = true;
+ return true;
+}
+
+bool DeadObjectProxy::call(JSContext* cx, HandleObject wrapper,
+ const CallArgs& args) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::construct(JSContext* cx, HandleObject wrapper,
+ const CallArgs& args) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::nativeCall(JSContext* cx, IsAcceptableThis test,
+ NativeImpl impl, const CallArgs& args) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::getBuiltinClass(JSContext* cx, HandleObject proxy,
+ ESClass* cls) const {
+ ReportDead(cx);
+ return false;
+}
+
+bool DeadObjectProxy::isArray(JSContext* cx, HandleObject obj,
+ JS::IsArrayAnswer* answer) const {
+ ReportDead(cx);
+ return false;
+}
+
+const char* DeadObjectProxy::className(JSContext* cx,
+ HandleObject wrapper) const {
+ return "DeadObject";
+}
+
+JSString* DeadObjectProxy::fun_toString(JSContext* cx, HandleObject proxy,
+ bool isToSource) const {
+ ReportDead(cx);
+ return nullptr;
+}
+
+RegExpShared* DeadObjectProxy::regexp_toShared(JSContext* cx,
+ HandleObject proxy) const {
+ ReportDead(cx);
+ return nullptr;
+}
+
+bool js::IsDeadProxyObject(const JSObject* obj) {
+ return IsDerivedProxyObject(obj, &DeadObjectProxy::singleton);
+}
+
+Value js::DeadProxyTargetValue(JSObject* obj) {
+ // When nuking scripted proxies, isCallable and isConstructor values for
+ // the proxy needs to be preserved. So does background-finalization status.
+ int32_t flags = 0;
+ if (obj->isCallable()) {
+ flags |= DeadObjectProxyIsCallable;
+ }
+ if (obj->isConstructor()) {
+ flags |= DeadObjectProxyIsConstructor;
+ }
+ if (obj->isBackgroundFinalized()) {
+ flags |= DeadObjectProxyIsBackgroundFinalized;
+ }
+ return Int32Value(flags);
+}
+
+JSObject* js::NewDeadProxyObject(JSContext* cx, JSObject* origObj) {
+ RootedValue target(cx);
+ if (origObj) {
+ target = DeadProxyTargetValue(origObj);
+ } else {
+ target = Int32Value(DeadObjectProxyIsBackgroundFinalized);
+ }
+
+ return NewProxyObject(cx, &DeadObjectProxy::singleton, target, nullptr,
+ ProxyOptions());
+}