mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
4e2b097bf2
There are several changes here: 1) When wrapping a callback interface object for JS, just extract the underlying JSObject from inside it and hand that object out. 2) Flag callback interface descriptors as "not concrete" (only matters for cases when they have constants on the interface object) and not wrappercached (will catch bugs if someone tries to treat them as a Gecko object). 3) Fix a preexisting bug in sequence wrapping where we'd try to JS_DefineElement twice if we were wrapping a null value for a sequence of nullable interface objects.
669 lines
21 KiB
C++
669 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* vim: set ts=2 sw=2 et tw=79: */
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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 <stdarg.h>
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#include "BindingUtils.h"
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#include "WrapperFactory.h"
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#include "xpcprivate.h"
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#include "XPCQuickStubs.h"
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#include "nsIXPConnect.h"
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namespace mozilla {
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namespace dom {
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JSErrorFormatString ErrorFormatString[] = {
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#define MSG_DEF(_name, _argc, _str) \
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{ _str, _argc, JSEXN_TYPEERR },
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#include "mozilla/dom/Errors.msg"
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#undef MSG_DEF
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};
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const JSErrorFormatString*
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GetErrorMessage(void* aUserRef, const char* aLocale,
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const unsigned aErrorNumber)
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{
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MOZ_ASSERT(aErrorNumber < ArrayLength(ErrorFormatString));
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return &ErrorFormatString[aErrorNumber];
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}
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bool
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ThrowErrorMessage(JSContext* aCx, const ErrNum aErrorNumber, ...)
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{
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va_list ap;
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va_start(ap, aErrorNumber);
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JS_ReportErrorNumberVA(aCx, GetErrorMessage, NULL,
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static_cast<const unsigned>(aErrorNumber), ap);
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va_end(ap);
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return false;
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}
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bool
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DefineConstants(JSContext* cx, JSObject* obj, ConstantSpec* cs)
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{
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for (; cs->name; ++cs) {
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JSBool ok =
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JS_DefineProperty(cx, obj, cs->name, cs->value, NULL, NULL,
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JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT);
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if (!ok) {
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return false;
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}
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}
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return true;
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}
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static inline bool
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Define(JSContext* cx, JSObject* obj, JSFunctionSpec* spec) {
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return JS_DefineFunctions(cx, obj, spec);
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}
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static inline bool
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Define(JSContext* cx, JSObject* obj, JSPropertySpec* spec) {
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return JS_DefineProperties(cx, obj, spec);
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}
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static inline bool
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Define(JSContext* cx, JSObject* obj, ConstantSpec* spec) {
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return DefineConstants(cx, obj, spec);
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}
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template<typename T>
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bool
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DefinePrefable(JSContext* cx, JSObject* obj, Prefable<T>* props)
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{
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MOZ_ASSERT(props);
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MOZ_ASSERT(props->specs);
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do {
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// Define if enabled
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if (props->enabled) {
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if (!Define(cx, obj, props->specs)) {
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return false;
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}
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}
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} while ((++props)->specs);
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return true;
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}
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// We should use JSFunction objects for interface objects, but we need a custom
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// hasInstance hook because we have new interface objects on prototype chains of
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// old (XPConnect-based) bindings. Because Function.prototype.toString throws if
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// passed a non-Function object we also need to provide our own toString method
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// for interface objects.
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enum {
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TOSTRING_CLASS_RESERVED_SLOT = 0,
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TOSTRING_NAME_RESERVED_SLOT = 1
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};
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JSBool
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InterfaceObjectToString(JSContext* cx, unsigned argc, JS::Value *vp)
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{
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JSObject* callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, vp));
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JSObject* obj = JS_THIS_OBJECT(cx, vp);
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if (!obj) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CONVERT_TO,
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"null", "object");
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return false;
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}
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jsval v = js::GetFunctionNativeReserved(callee, TOSTRING_CLASS_RESERVED_SLOT);
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JSClass* clasp = static_cast<JSClass*>(JSVAL_TO_PRIVATE(v));
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v = js::GetFunctionNativeReserved(callee, TOSTRING_NAME_RESERVED_SLOT);
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JSString* jsname = static_cast<JSString*>(JSVAL_TO_STRING(v));
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size_t length;
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const jschar* name = JS_GetInternedStringCharsAndLength(jsname, &length);
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if (js::GetObjectJSClass(obj) != clasp) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INCOMPATIBLE_PROTO,
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NS_ConvertUTF16toUTF8(name).get(), "toString",
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"object");
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return false;
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}
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nsString str;
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str.AppendLiteral("function ");
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str.Append(name, length);
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str.AppendLiteral("() {");
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str.Append('\n');
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str.AppendLiteral(" [native code]");
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str.Append('\n');
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str.AppendLiteral("}");
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return xpc::NonVoidStringToJsval(cx, str, vp);
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}
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static JSObject*
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CreateInterfaceObject(JSContext* cx, JSObject* global, JSObject* receiver,
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JSClass* constructorClass, JSNative constructorNative,
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unsigned ctorNargs, JSObject* proto,
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Prefable<JSFunctionSpec>* staticMethods,
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Prefable<ConstantSpec>* constants,
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const char* name)
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{
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JSObject* constructor;
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if (constructorClass) {
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JSObject* functionProto = JS_GetFunctionPrototype(cx, global);
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if (!functionProto) {
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return NULL;
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}
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constructor = JS_NewObject(cx, constructorClass, functionProto, global);
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} else {
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MOZ_ASSERT(constructorNative);
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JSFunction* fun = JS_NewFunction(cx, constructorNative, ctorNargs,
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JSFUN_CONSTRUCTOR, global, name);
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if (!fun) {
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return NULL;
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}
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constructor = JS_GetFunctionObject(fun);
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}
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if (!constructor) {
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return NULL;
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}
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if (staticMethods && !DefinePrefable(cx, constructor, staticMethods)) {
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return NULL;
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}
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if (constructorClass) {
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JSFunction* toString = js::DefineFunctionWithReserved(cx, constructor,
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"toString",
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InterfaceObjectToString,
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0, 0);
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if (!toString) {
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return NULL;
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}
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JSObject* toStringObj = JS_GetFunctionObject(toString);
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js::SetFunctionNativeReserved(toStringObj, TOSTRING_CLASS_RESERVED_SLOT,
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PRIVATE_TO_JSVAL(constructorClass));
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JSString *str = ::JS_InternString(cx, name);
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if (!str) {
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return NULL;
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}
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js::SetFunctionNativeReserved(toStringObj, TOSTRING_NAME_RESERVED_SLOT,
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STRING_TO_JSVAL(str));
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}
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if (constants && !DefinePrefable(cx, constructor, constants)) {
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return NULL;
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}
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if (proto && !JS_LinkConstructorAndPrototype(cx, constructor, proto)) {
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return NULL;
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}
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JSBool alreadyDefined;
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if (!JS_AlreadyHasOwnProperty(cx, receiver, name, &alreadyDefined)) {
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return NULL;
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}
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// This is Enumerable: False per spec.
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if (!alreadyDefined &&
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!JS_DefineProperty(cx, receiver, name, OBJECT_TO_JSVAL(constructor), NULL,
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NULL, 0)) {
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return NULL;
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}
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return constructor;
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}
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static JSObject*
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CreateInterfacePrototypeObject(JSContext* cx, JSObject* global,
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JSObject* parentProto, JSClass* protoClass,
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Prefable<JSFunctionSpec>* methods,
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Prefable<JSPropertySpec>* properties,
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Prefable<ConstantSpec>* constants)
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{
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JSObject* ourProto = JS_NewObjectWithUniqueType(cx, protoClass, parentProto,
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global);
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if (!ourProto) {
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return NULL;
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}
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if (methods && !DefinePrefable(cx, ourProto, methods)) {
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return NULL;
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}
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if (properties && !DefinePrefable(cx, ourProto, properties)) {
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return NULL;
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}
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if (constants && !DefinePrefable(cx, ourProto, constants)) {
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return NULL;
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}
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return ourProto;
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}
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JSObject*
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CreateInterfaceObjects(JSContext* cx, JSObject* global, JSObject *receiver,
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JSObject* protoProto, JSClass* protoClass,
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JSClass* constructorClass, JSNative constructor,
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unsigned ctorNargs, const DOMClass* domClass,
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Prefable<JSFunctionSpec>* methods,
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Prefable<JSPropertySpec>* properties,
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Prefable<ConstantSpec>* constants,
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Prefable<JSFunctionSpec>* staticMethods, const char* name)
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{
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MOZ_ASSERT(protoClass || constructorClass || constructor,
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"Need at least one class or a constructor!");
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MOZ_ASSERT(!(methods || properties) || protoClass,
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"Methods or properties but no protoClass!");
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MOZ_ASSERT(!staticMethods || constructorClass || constructor,
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"Static methods but no constructorClass or constructor!");
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MOZ_ASSERT(bool(name) == bool(constructorClass || constructor),
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"Must have name precisely when we have an interface object");
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MOZ_ASSERT(!constructorClass || !constructor);
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JSObject* proto;
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if (protoClass) {
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proto = CreateInterfacePrototypeObject(cx, global, protoProto, protoClass,
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methods, properties, constants);
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if (!proto) {
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return NULL;
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}
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js::SetReservedSlot(proto, DOM_PROTO_INSTANCE_CLASS_SLOT,
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JS::PrivateValue(const_cast<DOMClass*>(domClass)));
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}
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else {
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proto = NULL;
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}
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JSObject* interface;
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if (constructorClass || constructor) {
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interface = CreateInterfaceObject(cx, global, receiver, constructorClass,
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constructor, ctorNargs, proto,
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staticMethods, constants, name);
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if (!interface) {
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return NULL;
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}
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}
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return protoClass ? proto : interface;
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}
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static bool
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NativeInterface2JSObjectAndThrowIfFailed(XPCLazyCallContext& aLccx,
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JSContext* aCx,
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JS::Value* aRetval,
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xpcObjectHelper& aHelper,
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const nsIID* aIID,
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bool aAllowNativeWrapper)
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{
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nsresult rv;
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if (!XPCConvert::NativeInterface2JSObject(aLccx, aRetval, NULL, aHelper, aIID,
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NULL, aAllowNativeWrapper, &rv)) {
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// I can't tell if NativeInterface2JSObject throws JS exceptions
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// or not. This is a sloppy stab at the right semantics; the
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// method really ought to be fixed to behave consistently.
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if (!JS_IsExceptionPending(aCx)) {
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Throw<true>(aCx, NS_FAILED(rv) ? rv : NS_ERROR_UNEXPECTED);
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}
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return false;
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}
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return true;
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}
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bool
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DoHandleNewBindingWrappingFailure(JSContext* cx, JSObject* scope,
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nsISupports* value, JS::Value* vp)
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{
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if (JS_IsExceptionPending(cx)) {
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return false;
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}
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XPCLazyCallContext lccx(JS_CALLER, cx, scope);
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if (value) {
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xpcObjectHelper helper(value);
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return NativeInterface2JSObjectAndThrowIfFailed(lccx, cx, vp, helper, NULL,
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true);
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}
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return Throw<true>(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
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}
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// Can only be called with the immediate prototype of the instance object. Can
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// only be called on the prototype of an object known to be a DOM instance.
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JSBool
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InstanceClassHasProtoAtDepth(JSHandleObject protoObject, uint32_t protoID,
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uint32_t depth)
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{
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const DOMClass* domClass = static_cast<DOMClass*>(
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js::GetReservedSlot(protoObject, DOM_PROTO_INSTANCE_CLASS_SLOT).toPrivate());
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return (uint32_t)domClass->mInterfaceChain[depth] == protoID;
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}
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// Only set allowNativeWrapper to false if you really know you need it, if in
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// doubt use true. Setting it to false disables security wrappers.
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bool
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XPCOMObjectToJsval(JSContext* cx, JSObject* scope, xpcObjectHelper &helper,
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const nsIID* iid, bool allowNativeWrapper, JS::Value* rval)
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{
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XPCLazyCallContext lccx(JS_CALLER, cx, scope);
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if (!NativeInterface2JSObjectAndThrowIfFailed(lccx, cx, rval, helper, iid,
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allowNativeWrapper)) {
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return false;
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}
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#ifdef DEBUG
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JSObject* jsobj = JSVAL_TO_OBJECT(*rval);
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if (jsobj && !js::GetObjectParent(jsobj))
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NS_ASSERTION(js::GetObjectClass(jsobj)->flags & JSCLASS_IS_GLOBAL,
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"Why did we recreate this wrapper?");
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#endif
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return true;
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}
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JSBool
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QueryInterface(JSContext* cx, unsigned argc, JS::Value* vp)
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{
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JS::Value thisv = JS_THIS(cx, vp);
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if (thisv == JSVAL_NULL)
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return false;
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// Get the object. It might be a security wrapper, in which case we do a checked
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// unwrap.
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JSObject* origObj = JSVAL_TO_OBJECT(thisv);
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JSObject* obj = js::UnwrapObjectChecked(cx, origObj);
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if (!obj)
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return false;
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nsISupports* native;
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if (!UnwrapDOMObjectToISupports(obj, native)) {
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return Throw<true>(cx, NS_ERROR_FAILURE);
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}
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if (argc < 1) {
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return Throw<true>(cx, NS_ERROR_XPC_NOT_ENOUGH_ARGS);
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}
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JS::Value* argv = JS_ARGV(cx, vp);
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if (!argv[0].isObject()) {
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return Throw<true>(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
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}
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nsIJSIID* iid;
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xpc_qsSelfRef iidRef;
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if (NS_FAILED(xpc_qsUnwrapArg<nsIJSIID>(cx, argv[0], &iid, &iidRef.ptr,
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&argv[0]))) {
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return Throw<true>(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
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}
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MOZ_ASSERT(iid);
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if (iid->GetID()->Equals(NS_GET_IID(nsIClassInfo))) {
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nsresult rv;
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nsCOMPtr<nsIClassInfo> ci = do_QueryInterface(native, &rv);
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if (NS_FAILED(rv)) {
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return Throw<true>(cx, rv);
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}
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return WrapObject(cx, origObj, ci, &NS_GET_IID(nsIClassInfo), vp);
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}
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// Lie, otherwise we need to check classinfo or QI
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*vp = thisv;
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return true;
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}
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JSBool
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ThrowingConstructor(JSContext* cx, unsigned argc, JS::Value* vp)
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{
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return ThrowErrorMessage(cx, MSG_ILLEGAL_CONSTRUCTOR);
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}
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bool
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XrayResolveProperty(JSContext* cx, JSObject* wrapper, jsid id,
|
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JSPropertyDescriptor* desc,
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// And the things we need to determine the descriptor
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Prefable<JSFunctionSpec>* methods,
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jsid* methodIds,
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|
JSFunctionSpec* methodSpecs,
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size_t methodCount,
|
|
Prefable<JSPropertySpec>* attributes,
|
|
jsid* attributeIds,
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|
JSPropertySpec* attributeSpecs,
|
|
size_t attributeCount,
|
|
Prefable<ConstantSpec>* constants,
|
|
jsid* constantIds,
|
|
ConstantSpec* constantSpecs,
|
|
size_t constantCount)
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|
{
|
|
for (size_t prefIdx = 0; prefIdx < methodCount; ++prefIdx) {
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|
MOZ_ASSERT(methods[prefIdx].specs);
|
|
if (methods[prefIdx].enabled) {
|
|
// Set i to be the index into our full list of ids/specs that we're
|
|
// looking at now.
|
|
size_t i = methods[prefIdx].specs - methodSpecs;
|
|
for ( ; methodIds[i] != JSID_VOID; ++i) {
|
|
if (id == methodIds[i]) {
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|
JSFunction *fun = JS_NewFunctionById(cx, methodSpecs[i].call.op,
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|
methodSpecs[i].nargs, 0,
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|
wrapper, id);
|
|
if (!fun) {
|
|
return false;
|
|
}
|
|
SET_JITINFO(fun, methodSpecs[i].call.info);
|
|
JSObject *funobj = JS_GetFunctionObject(fun);
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desc->value.setObject(*funobj);
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|
desc->attrs = methodSpecs[i].flags;
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|
desc->obj = wrapper;
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|
desc->setter = nullptr;
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|
desc->getter = nullptr;
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return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (size_t prefIdx = 0; prefIdx < attributeCount; ++prefIdx) {
|
|
MOZ_ASSERT(attributes[prefIdx].specs);
|
|
if (attributes[prefIdx].enabled) {
|
|
// Set i to be the index into our full list of ids/specs that we're
|
|
// looking at now.
|
|
size_t i = attributes[prefIdx].specs - attributeSpecs;
|
|
for ( ; attributeIds[i] != JSID_VOID; ++i) {
|
|
if (id == attributeIds[i]) {
|
|
// Because of centralization, we need to make sure we fault in the
|
|
// JitInfos as well. At present, until the JSAPI changes, the easiest
|
|
// way to do this is wrap them up as functions ourselves.
|
|
desc->attrs = attributeSpecs[i].flags & ~JSPROP_NATIVE_ACCESSORS;
|
|
// They all have getters, so we can just make it.
|
|
JSObject *global = JS_GetGlobalForObject(cx, wrapper);
|
|
JSFunction *fun = JS_NewFunction(cx, (JSNative)attributeSpecs[i].getter.op,
|
|
0, 0, global, NULL);
|
|
if (!fun)
|
|
return false;
|
|
SET_JITINFO(fun, attributeSpecs[i].getter.info);
|
|
JSObject *funobj = JS_GetFunctionObject(fun);
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|
desc->getter = js::CastAsJSPropertyOp(funobj);
|
|
desc->attrs |= JSPROP_GETTER;
|
|
if (attributeSpecs[i].setter.op) {
|
|
// We have a setter! Make it.
|
|
fun = JS_NewFunction(cx, (JSNative)attributeSpecs[i].setter.op,
|
|
1, 0, global, NULL);
|
|
if (!fun)
|
|
return false;
|
|
SET_JITINFO(fun, attributeSpecs[i].setter.info);
|
|
funobj = JS_GetFunctionObject(fun);
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|
desc->setter = js::CastAsJSStrictPropertyOp(funobj);
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|
desc->attrs |= JSPROP_SETTER;
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|
} else {
|
|
desc->setter = NULL;
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}
|
|
desc->obj = wrapper;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (size_t prefIdx = 0; prefIdx < constantCount; ++prefIdx) {
|
|
MOZ_ASSERT(constants[prefIdx].specs);
|
|
if (constants[prefIdx].enabled) {
|
|
// Set i to be the index into our full list of ids/specs that we're
|
|
// looking at now.
|
|
size_t i = constants[prefIdx].specs - constantSpecs;
|
|
for ( ; constantIds[i] != JSID_VOID; ++i) {
|
|
if (id == constantIds[i]) {
|
|
desc->attrs = JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT;
|
|
desc->obj = wrapper;
|
|
desc->value = constantSpecs[i].value;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
XrayEnumerateProperties(JS::AutoIdVector& props,
|
|
Prefable<JSFunctionSpec>* methods,
|
|
jsid* methodIds,
|
|
JSFunctionSpec* methodSpecs,
|
|
size_t methodCount,
|
|
Prefable<JSPropertySpec>* attributes,
|
|
jsid* attributeIds,
|
|
JSPropertySpec* attributeSpecs,
|
|
size_t attributeCount,
|
|
Prefable<ConstantSpec>* constants,
|
|
jsid* constantIds,
|
|
ConstantSpec* constantSpecs,
|
|
size_t constantCount)
|
|
{
|
|
for (size_t prefIdx = 0; prefIdx < methodCount; ++prefIdx) {
|
|
MOZ_ASSERT(methods[prefIdx].specs);
|
|
if (methods[prefIdx].enabled) {
|
|
// Set i to be the index into our full list of ids/specs that we're
|
|
// looking at now.
|
|
size_t i = methods[prefIdx].specs - methodSpecs;
|
|
for ( ; methodIds[i] != JSID_VOID; ++i) {
|
|
if ((methodSpecs[i].flags & JSPROP_ENUMERATE) &&
|
|
!props.append(methodIds[i])) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (size_t prefIdx = 0; prefIdx < attributeCount; ++prefIdx) {
|
|
MOZ_ASSERT(attributes[prefIdx].specs);
|
|
if (attributes[prefIdx].enabled) {
|
|
// Set i to be the index into our full list of ids/specs that we're
|
|
// looking at now.
|
|
size_t i = attributes[prefIdx].specs - attributeSpecs;
|
|
for ( ; attributeIds[i] != JSID_VOID; ++i) {
|
|
if ((attributeSpecs[i].flags & JSPROP_ENUMERATE) &&
|
|
!props.append(attributeIds[i])) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (size_t prefIdx = 0; prefIdx < constantCount; ++prefIdx) {
|
|
MOZ_ASSERT(constants[prefIdx].specs);
|
|
if (constants[prefIdx].enabled) {
|
|
// Set i to be the index into our full list of ids/specs that we're
|
|
// looking at now.
|
|
size_t i = constants[prefIdx].specs - constantSpecs;
|
|
for ( ; constantIds[i] != JSID_VOID; ++i) {
|
|
if (!props.append(constantIds[i])) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
GetPropertyOnPrototype(JSContext* cx, JSObject* proxy, jsid id, bool* found,
|
|
JS::Value* vp)
|
|
{
|
|
JSObject* proto;
|
|
if (!js::GetObjectProto(cx, proxy, &proto)) {
|
|
return false;
|
|
}
|
|
if (!proto) {
|
|
*found = false;
|
|
return true;
|
|
}
|
|
|
|
JSBool hasProp;
|
|
if (!JS_HasPropertyById(cx, proto, id, &hasProp)) {
|
|
return false;
|
|
}
|
|
|
|
*found = hasProp;
|
|
if (!hasProp || !vp) {
|
|
return true;
|
|
}
|
|
|
|
return JS_ForwardGetPropertyTo(cx, proto, id, proxy, vp);
|
|
}
|
|
|
|
bool
|
|
HasPropertyOnPrototype(JSContext* cx, JSObject* proxy, DOMProxyHandler* handler,
|
|
jsid id)
|
|
{
|
|
Maybe<JSAutoCompartment> ac;
|
|
if (xpc::WrapperFactory::IsXrayWrapper(proxy)) {
|
|
proxy = js::UnwrapObject(proxy);
|
|
ac.construct(cx, proxy);
|
|
}
|
|
MOZ_ASSERT(js::IsProxy(proxy) && js::GetProxyHandler(proxy) == handler);
|
|
|
|
bool found;
|
|
// We ignore an error from GetPropertyOnPrototype.
|
|
return !GetPropertyOnPrototype(cx, proxy, id, &found, NULL) || found;
|
|
}
|
|
|
|
bool
|
|
WrapCallbackInterface(JSContext *cx, JSObject *scope, nsISupports* callback,
|
|
JS::Value* vp)
|
|
{
|
|
nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS = do_QueryInterface(callback);
|
|
MOZ_ASSERT(wrappedJS, "How can we not have an XPCWrappedJS here?");
|
|
JSObject* obj;
|
|
DebugOnly<nsresult> rv = wrappedJS->GetJSObject(&obj);
|
|
MOZ_ASSERT(NS_SUCCEEDED(rv) && obj, "What are we wrapping?");
|
|
*vp = JS::ObjectValue(*obj);
|
|
return JS_WrapValue(cx, vp);
|
|
}
|
|
|
|
JSObject*
|
|
GetXrayExpandoChain(JSObject* obj)
|
|
{
|
|
MOZ_ASSERT(IsDOMObject(obj));
|
|
JS::Value v = IsDOMProxy(obj) ? js::GetProxyExtra(obj, JSPROXYSLOT_XRAY_EXPANDO)
|
|
: js::GetReservedSlot(obj, DOM_XRAY_EXPANDO_SLOT);
|
|
return v.isUndefined() ? nullptr : &v.toObject();
|
|
}
|
|
|
|
void
|
|
SetXrayExpandoChain(JSObject* obj, JSObject* chain)
|
|
{
|
|
MOZ_ASSERT(IsDOMObject(obj));
|
|
JS::Value v = chain ? JS::ObjectValue(*chain) : JSVAL_VOID;
|
|
if (IsDOMProxy(obj)) {
|
|
js::SetProxyExtra(obj, JSPROXYSLOT_XRAY_EXPANDO, v);
|
|
} else {
|
|
js::SetReservedSlot(obj, DOM_XRAY_EXPANDO_SLOT, v);
|
|
}
|
|
}
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|