The Tor Browser: js/src/builtin/Object.cpp@6474c204b198 (annotated)

js/src/builtin/Object.cpp@6474c204b198 (annotated)

js/src/builtin/Object.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * 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 "builtin/Object.h"
 #include "mozilla/ArrayUtils.h"
 #include "jscntxt.h"
 #include "frontend/BytecodeCompiler.h"
 #include "vm/StringBuffer.h"
 #include "jsobjinlines.h"
 #include "vm/ObjectImpl-inl.h"
 using namespace js;
 using namespace js::types;
 using js::frontend::IsIdentifier;
 using mozilla::ArrayLength;
 bool
 js::obj_construct(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx, nullptr);
     if (args.length() > 0 && !args[0].isNullOrUndefined()) {
         obj = ToObject(cx, args[0]);
         if (!obj)
             return false;
     } else {
         /* Make an object whether this was called with 'new' or not. */
         if (!NewObjectScriptedCall(cx, &obj))
             return false;
     }
     args.rval().setObject(*obj);
     return true;
 }
 /* ES5 15.2.4.7. */
 static bool
 obj_propertyIsEnumerable(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     /* Step 1. */
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, args.get(0), &id))
         return false;
     /* Step 2. */
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     /* Steps 3. */
     RootedObject pobj(cx);
     RootedShape prop(cx);
     if (!JSObject::lookupGeneric(cx, obj, id, &pobj, &prop))
         return false;
     /* Step 4. */
     if (!prop) {
         args.rval().setBoolean(false);
         return true;
     }
     if (pobj != obj) {
         args.rval().setBoolean(false);
         return true;
     }
     /* Step 5. */
     unsigned attrs;
     if (!JSObject::getGenericAttributes(cx, pobj, id, &attrs))
         return false;
     args.rval().setBoolean((attrs & JSPROP_ENUMERATE) != 0);
     return true;
 }
 #if JS_HAS_TOSOURCE
 static bool
 obj_toSource(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     JS_CHECK_RECURSION(cx, return false);
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     JSString *str = ObjectToSource(cx, obj);
     if (!str)
         return false;
     args.rval().setString(str);
     return true;
 }
 JSString *
 js::ObjectToSource(JSContext *cx, HandleObject obj)
 {
     /* If outermost, we need parentheses to be an expression, not a block. */
     bool outermost = (cx->cycleDetectorSet.count() == 0);
     AutoCycleDetector detector(cx, obj);
     if (!detector.init())
         return nullptr;
     if (detector.foundCycle())
         return js_NewStringCopyZ<CanGC>(cx, "{}");
     StringBuffer buf(cx);
     if (outermost && !buf.append('('))
         return nullptr;
     if (!buf.append('{'))
         return nullptr;
     RootedValue v0(cx), v1(cx);
     MutableHandleValue val[2] = {&v0, &v1};
     RootedString str0(cx), str1(cx);
     MutableHandleString gsop[2] = {&str0, &str1};
     AutoIdVector idv(cx);
     if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &idv))
         return nullptr;
     bool comma = false;
     for (size_t i = 0; i < idv.length(); ++i) {
         RootedId id(cx, idv[i]);
         RootedObject obj2(cx);
         RootedShape shape(cx);
         if (!JSObject::lookupGeneric(cx, obj, id, &obj2, &shape))
             return nullptr;
         /*  Decide early whether we prefer get/set or old getter/setter syntax. */
         int valcnt = 0;
         if (shape) {
             bool doGet = true;
             if (obj2->isNative() && !IsImplicitDenseOrTypedArrayElement(shape)) {
                 unsigned attrs = shape->attributes();
                 if (attrs & JSPROP_GETTER) {
                     doGet = false;
                     val[valcnt].set(shape->getterValue());
                     gsop[valcnt].set(cx->names().get);
                     valcnt++;
                 }
                 if (attrs & JSPROP_SETTER) {
                     doGet = false;
                     val[valcnt].set(shape->setterValue());
                     gsop[valcnt].set(cx->names().set);
                     valcnt++;
                 }
             }
             if (doGet) {
                 valcnt = 1;
                 gsop[0].set(nullptr);
                 if (!JSObject::getGeneric(cx, obj, obj, id, val[0]))
                     return nullptr;
             }
         }
         /* Convert id to a linear string. */
         RootedValue idv(cx, IdToValue(id));
         JSString *s = ToString<CanGC>(cx, idv);
         if (!s)
             return nullptr;
         Rooted<JSLinearString*> idstr(cx, s->ensureLinear(cx));
         if (!idstr)
             return nullptr;
         /*
          * If id is a string that's not an identifier, or if it's a negative
          * integer, then it must be quoted.
          */
         if (JSID_IS_ATOM(id)
             ? !IsIdentifier(idstr)
             : (!JSID_IS_INT(id) || JSID_TO_INT(id) < 0))
         {
             s = js_QuoteString(cx, idstr, jschar('\''));
             if (!s || !(idstr = s->ensureLinear(cx)))
                 return nullptr;
         }
         for (int j = 0; j < valcnt; j++) {
             /*
              * Censor an accessor descriptor getter or setter part if it's
              * undefined.
              */
             if (gsop[j] && val[j].isUndefined())
                 continue;
             /* Convert val[j] to its canonical source form. */
             RootedString valstr(cx, ValueToSource(cx, val[j]));
             if (!valstr)
                 return nullptr;
             const jschar *vchars = valstr->getChars(cx);
             if (!vchars)
                 return nullptr;
             size_t vlength = valstr->length();
             /*
              * Remove '(function ' from the beginning of valstr and ')' from the
              * end so that we can put "get" in front of the function definition.
              */
             if (gsop[j] && IsFunctionObject(val[j])) {
                 const jschar *start = vchars;
                 const jschar *end = vchars + vlength;
                 uint8_t parenChomp = 0;
                 if (vchars[0] == '(') {
                     vchars++;
                     parenChomp = 1;
                 }
                 /* Try to jump "function" keyword. */
                 if (vchars)
                     vchars = js_strchr_limit(vchars, ' ', end);
                 /*
                  * Jump over the function's name: it can't be encoded as part
                  * of an ECMA getter or setter.
                  */
                 if (vchars)
                     vchars = js_strchr_limit(vchars, '(', end);
                 if (vchars) {
                     if (*vchars == ' ')
                         vchars++;
                     vlength = end - vchars - parenChomp;
                 } else {
                     gsop[j].set(nullptr);
                     vchars = start;
                 }
             }
             if (comma && !buf.append(", "))
                 return nullptr;
             comma = true;
             if (gsop[j])
                 if (!buf.append(gsop[j]) || !buf.append(' '))
                     return nullptr;
             if (!buf.append(idstr))
                 return nullptr;
             if (!buf.append(gsop[j] ? ' ' : ':'))
                 return nullptr;
             if (!buf.append(vchars, vlength))
                 return nullptr;
         }
     }
     if (!buf.append('}'))
         return nullptr;
     if (outermost && !buf.append(')'))
         return nullptr;
     return buf.finishString();
 }
 #endif /* JS_HAS_TOSOURCE */
 JSString *
 JS_BasicObjectToString(JSContext *cx, HandleObject obj)
 {
     // Some classes are really common, don't allocate new strings for them.
     // The ordering below is based on the measurements in bug 966264.
     if (obj->is<JSObject>())
         return cx->names().objectObject;
     if (obj->is<StringObject>())
         return cx->names().objectString;
     if (obj->is<ArrayObject>())
         return cx->names().objectArray;
     if (obj->is<JSFunction>())
         return cx->names().objectFunction;
     if (obj->is<NumberObject>())
         return cx->names().objectNumber;
     const char *className = JSObject::className(cx, obj);
     if (strcmp(className, "Window") == 0)
         return cx->names().objectWindow;
     StringBuffer sb(cx);
     if (!sb.append("[object ") || !sb.appendInflated(className, strlen(className)) ||
         !sb.append("]"))
     {
         return nullptr;
     }
     return sb.finishString();
 }
 /* ES5 15.2.4.2.  Note steps 1 and 2 are errata. */
 static bool
 obj_toString(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     /* Step 1. */
     if (args.thisv().isUndefined()) {
         args.rval().setString(cx->names().objectUndefined);
         return true;
     }
     /* Step 2. */
     if (args.thisv().isNull()) {
         args.rval().setString(cx->names().objectNull);
         return true;
     }
     /* Step 3. */
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     /* Steps 4-5. */
     JSString *str = JS_BasicObjectToString(cx, obj);
     if (!str)
         return false;
     args.rval().setString(str);
     return true;
 }
 /* ES5 15.2.4.3. */
 static bool
 obj_toLocaleString(JSContext *cx, unsigned argc, Value *vp)
 {
     JS_CHECK_RECURSION(cx, return false);
     CallArgs args = CallArgsFromVp(argc, vp);
     /* Step 1. */
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     /* Steps 2-4. */
     RootedId id(cx, NameToId(cx->names().toString));
     return obj->callMethod(cx, id, 0, nullptr, args.rval());
 }
 static bool
 obj_valueOf(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     args.rval().setObject(*obj);
     return true;
 }
 #if JS_OLD_GETTER_SETTER_METHODS
 enum DefineType { GetterAccessor, SetterAccessor };
 template<DefineType Type>
 static bool
 DefineAccessor(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     if (!BoxNonStrictThis(cx, args))
         return false;
     if (args.length() < 2 || !js_IsCallable(args[1])) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
                              JSMSG_BAD_GETTER_OR_SETTER,
                              Type == GetterAccessor ? js_getter_str : js_setter_str);
         return false;
     }
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, args[0], &id))
         return false;
     RootedObject descObj(cx, NewBuiltinClassInstance(cx, &JSObject::class_));
     if (!descObj)
         return false;
     JSAtomState &names = cx->names();
     RootedValue trueVal(cx, BooleanValue(true));
     /* enumerable: true */
     if (!JSObject::defineProperty(cx, descObj, names.enumerable, trueVal))
         return false;
     /* configurable: true */
     if (!JSObject::defineProperty(cx, descObj, names.configurable, trueVal))
         return false;
     /* enumerable: true */
     PropertyName *acc = (Type == GetterAccessor) ? names.get : names.set;
     RootedValue accessorVal(cx, args[1]);
     if (!JSObject::defineProperty(cx, descObj, acc, accessorVal))
         return false;
     RootedObject thisObj(cx, &args.thisv().toObject());
     bool dummy;
     RootedValue descObjValue(cx, ObjectValue(*descObj));
     if (!DefineOwnProperty(cx, thisObj, id, descObjValue, &dummy))
         return false;
     args.rval().setUndefined();
     return true;
 }
 JS_FRIEND_API(bool)
 js::obj_defineGetter(JSContext *cx, unsigned argc, Value *vp)
 {
     return DefineAccessor<GetterAccessor>(cx, argc, vp);
 }
 JS_FRIEND_API(bool)
 js::obj_defineSetter(JSContext *cx, unsigned argc, Value *vp)
 {
     return DefineAccessor<SetterAccessor>(cx, argc, vp);
 }
 static bool
 obj_lookupGetter(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, args.get(0), &id))
         return false;
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     if (obj->is<ProxyObject>()) {
         // The vanilla getter lookup code below requires that the object is
         // native. Handle proxies separately.
         args.rval().setUndefined();
         Rooted<PropertyDescriptor> desc(cx);
         if (!Proxy::getPropertyDescriptor(cx, obj, id, &desc))
             return false;
         if (desc.object() && desc.hasGetterObject() && desc.getterObject())
             args.rval().setObject(*desc.getterObject());
         return true;
     }
     RootedObject pobj(cx);
     RootedShape shape(cx);
     if (!JSObject::lookupGeneric(cx, obj, id, &pobj, &shape))
         return false;
     args.rval().setUndefined();
     if (shape) {
         if (pobj->isNative() && !IsImplicitDenseOrTypedArrayElement(shape)) {
             if (shape->hasGetterValue())
                 args.rval().set(shape->getterValue());
         }
     }
     return true;
 }
 static bool
 obj_lookupSetter(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, args.get(0), &id))
         return false;
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     if (obj->is<ProxyObject>()) {
         // The vanilla setter lookup code below requires that the object is
         // native. Handle proxies separately.
         args.rval().setUndefined();
         Rooted<PropertyDescriptor> desc(cx);
         if (!Proxy::getPropertyDescriptor(cx, obj, id, &desc))
             return false;
         if (desc.object() && desc.hasSetterObject() && desc.setterObject())
             args.rval().setObject(*desc.setterObject());
         return true;
     }
     RootedObject pobj(cx);
     RootedShape shape(cx);
     if (!JSObject::lookupGeneric(cx, obj, id, &pobj, &shape))
         return false;
     args.rval().setUndefined();
     if (shape) {
         if (pobj->isNative() && !IsImplicitDenseOrTypedArrayElement(shape)) {
             if (shape->hasSetterValue())
                 args.rval().set(shape->setterValue());
         }
     }
     return true;
 }
 #endif /* JS_OLD_GETTER_SETTER_METHODS */
 /* ES5 15.2.3.2. */
 static bool
 obj_getPrototypeOf(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     /* Step 1. */
     if (args.length() == 0) {
         js_ReportMissingArg(cx, args.calleev(), 0);
         return false;
     }
     if (args[0].isPrimitive()) {
         RootedValue val(cx, args[0]);
         char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, val, NullPtr());
         if (!bytes)
             return false;
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
                              JSMSG_UNEXPECTED_TYPE, bytes, "not an object");
         js_free(bytes);
         return false;
     }
     /* Step 2. */
     /*
      * Implement [[Prototype]]-getting -- particularly across compartment
      * boundaries -- by calling a cached __proto__ getter function.
      */
     InvokeArgs args2(cx);
     if (!args2.init(0))
         return false;
     args2.setCallee(cx->global()->protoGetter());
     args2.setThis(args[0]);
     if (!Invoke(cx, args2))
         return false;
     args.rval().set(args2.rval());
     return true;
 }
 static bool
 obj_setPrototypeOf(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject setPrototypeOf(cx, &args.callee());
     if (!GlobalObject::warnOnceAboutPrototypeMutation(cx, setPrototypeOf))
         return false;
     if (args.length() < 2) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                              "Object.setPrototypeOf", "1", "");
         return false;
     }
     /* Step 1-2. */
     if (args[0].isNullOrUndefined()) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_CONVERT_TO,
                              args[0].isNull() ? "null" : "undefined", "object");
         return false;
     }
     /* Step 3. */
     if (!args[1].isObjectOrNull()) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
                              "Object.setPrototypeOf", "an object or null", InformalValueTypeName(args[1]));
         return false;
     }
     /* Step 4. */
     if (!args[0].isObject()) {
         args.rval().set(args[0]);
         return true;
     }
     /* Step 5-6. */
     RootedObject obj(cx, &args[0].toObject());
     RootedObject newProto(cx, args[1].toObjectOrNull());
     bool success;
     if (!JSObject::setProto(cx, obj, newProto, &success))
         return false;
     /* Step 7. */
     if (!success) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_OBJECT_NOT_EXTENSIBLE, "object");
         return false;
     }
     /* Step 8. */
     args.rval().set(args[0]);
     return true;
 }
 #if JS_HAS_OBJ_WATCHPOINT
 bool
 js::WatchHandler(JSContext *cx, JSObject *obj_, jsid id_, JS::Value old,
                  JS::Value *nvp, void *closure)
 {
     RootedObject obj(cx, obj_);
     RootedId id(cx, id_);
     /* Avoid recursion on (obj, id) already being watched on cx. */
     AutoResolving resolving(cx, obj, id, AutoResolving::WATCH);
     if (resolving.alreadyStarted())
         return true;
     JSObject *callable = (JSObject *)closure;
     Value argv[] = { IdToValue(id), old, *nvp };
     RootedValue rv(cx);
     if (!Invoke(cx, ObjectValue(*obj), ObjectOrNullValue(callable), ArrayLength(argv), argv, &rv))
         return false;
     *nvp = rv;
     return true;
 }
 static bool
 obj_watch(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     if (!GlobalObject::warnOnceAboutWatch(cx, obj))
         return false;
     if (args.length() <= 1) {
         js_ReportMissingArg(cx, args.calleev(), 1);
         return false;
     }
     RootedObject callable(cx, ValueToCallable(cx, args[1], args.length() - 2));
     if (!callable)
         return false;
     RootedId propid(cx);
     if (!ValueToId<CanGC>(cx, args[0], &propid))
         return false;
     if (!JSObject::watch(cx, obj, propid, callable))
         return false;
     args.rval().setUndefined();
     return true;
 }
 static bool
 obj_unwatch(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     if (!GlobalObject::warnOnceAboutWatch(cx, obj))
         return false;
     RootedId id(cx);
     if (args.length() != 0) {
         if (!ValueToId<CanGC>(cx, args[0], &id))
             return false;
     } else {
         id = JSID_VOID;
     }
     if (!JSObject::unwatch(cx, obj, id))
         return false;
     args.rval().setUndefined();
     return true;
 }
 #endif /* JS_HAS_OBJ_WATCHPOINT */
 /* ECMA 15.2.4.5. */
 static bool
 obj_hasOwnProperty(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     HandleValue idValue = args.get(0);
     /* Step 1, 2. */
     jsid id;
     if (args.thisv().isObject() && ValueToId<NoGC>(cx, idValue, &id)) {
         JSObject *obj = &args.thisv().toObject(), *obj2;
         Shape *prop;
         if (!obj->is<ProxyObject>() &&
             HasOwnProperty<NoGC>(cx, obj->getOps()->lookupGeneric, obj, id, &obj2, &prop))
         {
             args.rval().setBoolean(!!prop);
             return true;
         }
     }
     /* Step 1. */
     RootedId idRoot(cx);
     if (!ValueToId<CanGC>(cx, idValue, &idRoot))
         return false;
     /* Step 2. */
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     /* Non-standard code for proxies. */
     if (obj->is<ProxyObject>()) {
         bool has;
         if (!Proxy::hasOwn(cx, obj, idRoot, &has))
             return false;
         args.rval().setBoolean(has);
         return true;
     }
     /* Step 3. */
     bool found;
     if (!HasOwnProperty(cx, obj, idRoot, &found))
         return false;
     /* Step 4,5. */
     args.rval().setBoolean(found);
     return true;
 }
 /* ES5 15.2.4.6. */
 static bool
 obj_isPrototypeOf(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     /* Step 1. */
     if (args.length() < 1 || !args[0].isObject()) {
         args.rval().setBoolean(false);
         return true;
     }
     /* Step 2. */
     RootedObject obj(cx, ToObject(cx, args.thisv()));
     if (!obj)
         return false;
     /* Step 3. */
     bool isDelegate;
     if (!IsDelegate(cx, obj, args[0], &isDelegate))
         return false;
     args.rval().setBoolean(isDelegate);
     return true;
 }
 /* ES5 15.2.3.5: Object.create(O [, Properties]) */
 static bool
 obj_create(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     if (args.length() == 0) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                              "Object.create", "0", "s");
         return false;
     }
     RootedValue v(cx, args[0]);
     if (!v.isObjectOrNull()) {
         char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NullPtr());
         if (!bytes)
             return false;
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
                              bytes, "not an object or null");
         js_free(bytes);
         return false;
     }
     RootedObject proto(cx, v.toObjectOrNull());
     /*
      * Use the callee's global as the parent of the new object to avoid dynamic
      * scoping (i.e., using the caller's global).
      */
     RootedObject obj(cx, NewObjectWithGivenProto(cx, &JSObject::class_, proto, &args.callee().global()));
     if (!obj)
         return false;
     /* 15.2.3.5 step 4. */
     if (args.hasDefined(1)) {
         if (args[1].isPrimitive()) {
             JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT);
             return false;
         }
         RootedObject props(cx, &args[1].toObject());
         if (!DefineProperties(cx, obj, props))
             return false;
     }
     /* 5. Return obj. */
     args.rval().setObject(*obj);
     return true;
 }
 static bool
 obj_getOwnPropertyDescriptor(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.getOwnPropertyDescriptor", &obj))
         return false;
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, args.get(1), &id))
         return false;
     return GetOwnPropertyDescriptor(cx, obj, id, args.rval());
 }
 static bool
 obj_keys(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.keys", &obj))
         return false;
     AutoIdVector props(cx);
     if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &props))
         return false;
     AutoValueVector vals(cx);
     if (!vals.reserve(props.length()))
         return false;
     for (size_t i = 0, len = props.length(); i < len; i++) {
         jsid id = props[i];
         if (JSID_IS_STRING(id)) {
             vals.infallibleAppend(StringValue(JSID_TO_STRING(id)));
         } else if (JSID_IS_INT(id)) {
             JSString *str = Int32ToString<CanGC>(cx, JSID_TO_INT(id));
             if (!str)
                 return false;
             vals.infallibleAppend(StringValue(str));
         } else {
             JS_ASSERT(JSID_IS_OBJECT(id));
         }
     }
     JS_ASSERT(props.length() <= UINT32_MAX);
     JSObject *aobj = NewDenseCopiedArray(cx, uint32_t(vals.length()), vals.begin());
     if (!aobj)
         return false;
     args.rval().setObject(*aobj);
     return true;
 }
 /* ES6 draft 15.2.3.16 */
 static bool
 obj_is(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     bool same;
     if (!SameValue(cx, args.get(0), args.get(1), &same))
         return false;
     args.rval().setBoolean(same);
     return true;
 }
 static bool
 obj_getOwnPropertyNames(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.getOwnPropertyNames", &obj))
         return false;
     AutoIdVector keys(cx);
     if (!GetPropertyNames(cx, obj, JSITER_OWNONLY | JSITER_HIDDEN, &keys))
         return false;
     AutoValueVector vals(cx);
     if (!vals.resize(keys.length()))
         return false;
     for (size_t i = 0, len = keys.length(); i < len; i++) {
          jsid id = keys[i];
          if (JSID_IS_INT(id)) {
              JSString *str = Int32ToString<CanGC>(cx, JSID_TO_INT(id));
              if (!str)
                  return false;
              vals[i].setString(str);
          } else if (JSID_IS_ATOM(id)) {
              vals[i].setString(JSID_TO_STRING(id));
          } else {
              vals[i].setObject(*JSID_TO_OBJECT(id));
          }
     }
     JSObject *aobj = NewDenseCopiedArray(cx, vals.length(), vals.begin());
     if (!aobj)
         return false;
     args.rval().setObject(*aobj);
     return true;
 }
 /* ES5 15.2.3.6: Object.defineProperty(O, P, Attributes) */
 static bool
 obj_defineProperty(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.defineProperty", &obj))
         return false;
     RootedId id(cx);
     if (!ValueToId<CanGC>(cx, args.get(1), &id))
         return false;
     bool junk;
     if (!DefineOwnProperty(cx, obj, id, args.get(2), &junk))
         return false;
     args.rval().setObject(*obj);
     return true;
 }
 /* ES5 15.2.3.7: Object.defineProperties(O, Properties) */
 static bool
 obj_defineProperties(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     /* Steps 1 and 7. */
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.defineProperties", &obj))
         return false;
     args.rval().setObject(*obj);
     /* Step 2. */
     if (args.length() < 2) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                              "Object.defineProperties", "0", "s");
         return false;
     }
     RootedValue val(cx, args[1]);
     RootedObject props(cx, ToObject(cx, val));
     if (!props)
         return false;
     /* Steps 3-6. */
     return DefineProperties(cx, obj, props);
 }
 static bool
 obj_isExtensible(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.isExtensible", &obj))
         return false;
     bool extensible;
     if (!JSObject::isExtensible(cx, obj, &extensible))
         return false;
     args.rval().setBoolean(extensible);
     return true;
 }
 static bool
 obj_preventExtensions(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.preventExtensions", &obj))
         return false;
     args.rval().setObject(*obj);
     bool extensible;
     if (!JSObject::isExtensible(cx, obj, &extensible))
         return false;
     if (!extensible)
         return true;
     return JSObject::preventExtensions(cx, obj);
 }
 static bool
 obj_freeze(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.freeze", &obj))
         return false;
     args.rval().setObject(*obj);
     return JSObject::freeze(cx, obj);
 }
 static bool
 obj_isFrozen(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.preventExtensions", &obj))
         return false;
     bool frozen;
     if (!JSObject::isFrozen(cx, obj, &frozen))
         return false;
     args.rval().setBoolean(frozen);
     return true;
 }
 static bool
 obj_seal(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.seal", &obj))
         return false;
     args.rval().setObject(*obj);
     return JSObject::seal(cx, obj);
 }
 static bool
 obj_isSealed(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     RootedObject obj(cx);
     if (!GetFirstArgumentAsObject(cx, args, "Object.isSealed", &obj))
         return false;
     bool sealed;
     if (!JSObject::isSealed(cx, obj, &sealed))
         return false;
     args.rval().setBoolean(sealed);
     return true;
 }
 const JSFunctionSpec js::object_methods[] = {
 #if JS_HAS_TOSOURCE
     JS_FN(js_toSource_str,             obj_toSource,                0,0),
 #endif
     JS_FN(js_toString_str,             obj_toString,                0,0),
     JS_FN(js_toLocaleString_str,       obj_toLocaleString,          0,0),
     JS_FN(js_valueOf_str,              obj_valueOf,                 0,0),
 #if JS_HAS_OBJ_WATCHPOINT
     JS_FN(js_watch_str,                obj_watch,                   2,0),
     JS_FN(js_unwatch_str,              obj_unwatch,                 1,0),
 #endif
     JS_FN(js_hasOwnProperty_str,       obj_hasOwnProperty,          1,0),
     JS_FN(js_isPrototypeOf_str,        obj_isPrototypeOf,           1,0),
     JS_FN(js_propertyIsEnumerable_str, obj_propertyIsEnumerable,    1,0),
 #if JS_OLD_GETTER_SETTER_METHODS
     JS_FN(js_defineGetter_str,         js::obj_defineGetter,        2,0),
     JS_FN(js_defineSetter_str,         js::obj_defineSetter,        2,0),
     JS_FN(js_lookupGetter_str,         obj_lookupGetter,            1,0),
     JS_FN(js_lookupSetter_str,         obj_lookupSetter,            1,0),
 #endif
     JS_FS_END
 };
 const JSFunctionSpec js::object_static_methods[] = {
     JS_FN("getPrototypeOf",            obj_getPrototypeOf,          1,0),
     JS_FN("setPrototypeOf",            obj_setPrototypeOf,          2,0),
     JS_FN("getOwnPropertyDescriptor",  obj_getOwnPropertyDescriptor,2,0),
     JS_FN("keys",                      obj_keys,                    1,0),
     JS_FN("is",                        obj_is,                      2,0),
     JS_FN("defineProperty",            obj_defineProperty,          3,0),
     JS_FN("defineProperties",          obj_defineProperties,        2,0),
     JS_FN("create",                    obj_create,                  2,0),
     JS_FN("getOwnPropertyNames",       obj_getOwnPropertyNames,     1,0),
     JS_FN("isExtensible",              obj_isExtensible,            1,0),
     JS_FN("preventExtensions",         obj_preventExtensions,       1,0),
     JS_FN("freeze",                    obj_freeze,                  1,0),
     JS_FN("isFrozen",                  obj_isFrozen,                1,0),
     JS_FN("seal",                      obj_seal,                    1,0),
     JS_FN("isSealed",                  obj_isSealed,                1,0),
     JS_FS_END
 };

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js/src/builtin/Object.cpp@6474c204b198 (annotated)

js/src/builtin/Object.cpp