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 /* -*- 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/. */

 #ifndef vm_GlobalObject_h

 #define vm_GlobalObject_h

 #include "jsarray.h"

 #include "jsbool.h"

 #include "jsexn.h"

 #include "jsfun.h"

 #include "jsnum.h"

 #include "builtin/RegExp.h"

 #include "js/Vector.h"

 #include "vm/ArrayBufferObject.h"

 #include "vm/ErrorObject.h"

 extern JSObject *

 js_InitObjectClass(JSContext *cx, js::HandleObject obj);

 extern JSObject *

 js_InitFunctionClass(JSContext *cx, js::HandleObject obj);

 extern JSObject *

 js_InitTypedArrayClasses(JSContext *cx, js::HandleObject obj);

 extern JSObject *

 js_InitSharedArrayBufferClass(JSContext *cx, js::HandleObject obj);

 namespace js {

 class Debugger;

 class TypedObjectModuleObject;

 /*

  * Global object slots are reserved as follows:

  *

  * [0, APPLICATION_SLOTS)

  *   Pre-reserved slots in all global objects set aside for the embedding's

  *   use. As with all reserved slots these start out as UndefinedValue() and

  *   are traced for GC purposes. Apart from that the engine never touches

  *   these slots, so the embedding can do whatever it wants with them.

  * [APPLICATION_SLOTS, APPLICATION_SLOTS + JSProto_LIMIT)

  *   Stores the original value of the constructor for the corresponding

  *   JSProtoKey.

  * [APPLICATION_SLOTS + JSProto_LIMIT, APPLICATION_SLOTS + 2 * JSProto_LIMIT)

  *   Stores the prototype, if any, for the constructor for the corresponding

  *   JSProtoKey offset from JSProto_LIMIT.

  * [APPLICATION_SLOTS + 2 * JSProto_LIMIT, APPLICATION_SLOTS + 3 * JSProto_LIMIT)

  *   Stores the current value of the global property named for the JSProtoKey

  *   for the corresponding JSProtoKey offset from 2 * JSProto_LIMIT.

  * [APPLICATION_SLOTS + 3 * JSProto_LIMIT, RESERVED_SLOTS)

  *   Various one-off values: ES5 13.2.3's [[ThrowTypeError]], RegExp statics,

  *   the original eval for this global object (implementing |var eval =

  *   otherWindow.eval; eval(...)| as an indirect eval), a bit indicating

  *   whether this object has been cleared (see JS_ClearScope), and a cache for

  *   whether eval is allowed (per the global's Content Security Policy).

  *

  * The first two JSProto_LIMIT-sized ranges are necessary to implement

  * js::FindClassObject, and spec language speaking in terms of "the original

  * Array prototype object", or "as if by the expression new Array()" referring

  * to the original Array constructor. The third range stores the (writable and

  * even deletable) Object, Array, &c. properties (although a slot won't be used

  * again if its property is deleted and readded).

  */

 class GlobalObject : public JSObject

 {

     /* Count of slots set aside for application use. */

     static const unsigned APPLICATION_SLOTS = 3;

     /*

      * Count of slots to store built-in constructors, prototypes, and initial

      * visible properties for the constructors.

      */

     static const unsigned STANDARD_CLASS_SLOTS  = JSProto_LIMIT * 3;

     /* Various function values needed by the engine. */

     static const unsigned EVAL                    = APPLICATION_SLOTS + STANDARD_CLASS_SLOTS;

     static const unsigned CREATE_DATAVIEW_FOR_THIS = EVAL + 1;

     static const unsigned THROWTYPEERROR          = CREATE_DATAVIEW_FOR_THIS + 1;

     static const unsigned PROTO_GETTER            = THROWTYPEERROR + 1;

     /*

      * Instances of the internal createArrayFromBuffer function used by the

      * typed array code, one per typed array element type.

      */

     static const unsigned FROM_BUFFER_UINT8 = PROTO_GETTER + 1;

     static const unsigned FROM_BUFFER_INT8 = FROM_BUFFER_UINT8 + 1;

     static const unsigned FROM_BUFFER_UINT16 = FROM_BUFFER_INT8 + 1;

     static const unsigned FROM_BUFFER_INT16 = FROM_BUFFER_UINT16 + 1;

     static const unsigned FROM_BUFFER_UINT32 = FROM_BUFFER_INT16 + 1;

     static const unsigned FROM_BUFFER_INT32 = FROM_BUFFER_UINT32 + 1;

     static const unsigned FROM_BUFFER_FLOAT32 = FROM_BUFFER_INT32 + 1;

     static const unsigned FROM_BUFFER_FLOAT64 = FROM_BUFFER_FLOAT32 + 1;

     static const unsigned FROM_BUFFER_UINT8CLAMPED = FROM_BUFFER_FLOAT64 + 1;

     /* One-off properties stored after slots for built-ins. */

     static const unsigned ARRAY_ITERATOR_PROTO  = FROM_BUFFER_UINT8CLAMPED + 1;

     static const unsigned STRING_ITERATOR_PROTO  = ARRAY_ITERATOR_PROTO + 1;

     static const unsigned LEGACY_GENERATOR_OBJECT_PROTO = STRING_ITERATOR_PROTO + 1;

     static const unsigned STAR_GENERATOR_OBJECT_PROTO = LEGACY_GENERATOR_OBJECT_PROTO + 1;

     static const unsigned MAP_ITERATOR_PROTO      = STAR_GENERATOR_OBJECT_PROTO + 1;

     static const unsigned SET_ITERATOR_PROTO      = MAP_ITERATOR_PROTO + 1;

     static const unsigned COLLATOR_PROTO          = SET_ITERATOR_PROTO + 1;

     static const unsigned NUMBER_FORMAT_PROTO     = COLLATOR_PROTO + 1;

     static const unsigned DATE_TIME_FORMAT_PROTO  = NUMBER_FORMAT_PROTO + 1;

     static const unsigned REGEXP_STATICS          = DATE_TIME_FORMAT_PROTO + 1;

     static const unsigned WARNED_WATCH_DEPRECATED = REGEXP_STATICS + 1;

     static const unsigned WARNED_PROTO_SETTING_SLOW = WARNED_WATCH_DEPRECATED + 1;

     static const unsigned RUNTIME_CODEGEN_ENABLED = WARNED_PROTO_SETTING_SLOW + 1;

     static const unsigned DEBUGGERS               = RUNTIME_CODEGEN_ENABLED + 1;

     static const unsigned INTRINSICS              = DEBUGGERS + 1;

     static const unsigned FLOAT32X4_TYPE_DESCR   = INTRINSICS + 1;

     static const unsigned INT32X4_TYPE_DESCR     = FLOAT32X4_TYPE_DESCR + 1;

     static const unsigned FOR_OF_PIC_CHAIN        = INT32X4_TYPE_DESCR + 1;

     /* Total reserved-slot count for global objects. */

     static const unsigned RESERVED_SLOTS = FOR_OF_PIC_CHAIN + 1;

     /*

      * The slot count must be in the public API for JSCLASS_GLOBAL_FLAGS, and

      * we won't expose GlobalObject, so just assert that the two values are

      * synchronized.

      */

     static_assert(JSCLASS_GLOBAL_SLOT_COUNT == RESERVED_SLOTS,

                   "global object slot counts are inconsistent");

     /* Initialize the Function and Object classes.  Must only be called once! */

     JSObject *

     initFunctionAndObjectClasses(JSContext *cx);

     void setThrowTypeError(JSFunction *fun) {

         JS_ASSERT(getSlotRef(THROWTYPEERROR).isUndefined());

         setSlot(THROWTYPEERROR, ObjectValue(*fun));

     }

     void setOriginalEval(JSObject *evalobj) {

         JS_ASSERT(getSlotRef(EVAL).isUndefined());

         setSlot(EVAL, ObjectValue(*evalobj));

     }

     void setProtoGetter(JSFunction *protoGetter) {

         JS_ASSERT(getSlotRef(PROTO_GETTER).isUndefined());

         setSlot(PROTO_GETTER, ObjectValue(*protoGetter));

     }

     void setIntrinsicsHolder(JSObject *obj) {

         JS_ASSERT(getSlotRef(INTRINSICS).isUndefined());

         setSlot(INTRINSICS, ObjectValue(*obj));

     }

     // Emit the specified warning if the given slot in |obj|'s global isn't

     // true, then set the slot to true.  Thus calling this method warns once

     // for each global object it's called on, and every other call does

     // nothing.

     static bool

     warnOnceAbout(JSContext *cx, HandleObject obj, uint32_t slot, unsigned errorNumber);

   public:

     Value getConstructor(JSProtoKey key) const {

         JS_ASSERT(key <= JSProto_LIMIT);

         return getSlot(APPLICATION_SLOTS + key);

     }

     static bool ensureConstructor(JSContext *cx, Handle<GlobalObject*> global, JSProtoKey key);

     static bool resolveConstructor(JSContext *cx, Handle<GlobalObject*> global, JSProtoKey key);

     static bool initBuiltinConstructor(JSContext *cx, Handle<GlobalObject*> global,

                                        JSProtoKey key, HandleObject ctor, HandleObject proto);

     void setConstructor(JSProtoKey key, const Value &v) {

         JS_ASSERT(key <= JSProto_LIMIT);

         setSlot(APPLICATION_SLOTS + key, v);

     }

     Value getPrototype(JSProtoKey key) const {

         JS_ASSERT(key <= JSProto_LIMIT);

         return getSlot(APPLICATION_SLOTS + JSProto_LIMIT + key);

     }

     void setPrototype(JSProtoKey key, const Value &value) {

         JS_ASSERT(key <= JSProto_LIMIT);

         setSlot(APPLICATION_SLOTS + JSProto_LIMIT + key, value);

     }

     static uint32_t constructorPropertySlot(JSProtoKey key) {

         JS_ASSERT(key <= JSProto_LIMIT);

         return APPLICATION_SLOTS + JSProto_LIMIT * 2 + key;

     }

     Value getConstructorPropertySlot(JSProtoKey key) {

         return getSlot(constructorPropertySlot(key));

     }

     void setConstructorPropertySlot(JSProtoKey key, const Value &ctor) {

         setSlot(constructorPropertySlot(key), ctor);

     }

     bool classIsInitialized(JSProtoKey key) const {

         bool inited = !getConstructor(key).isUndefined();

         JS_ASSERT(inited == !getPrototype(key).isUndefined());

         return inited;

     }

     bool functionObjectClassesInitialized() const {

         bool inited = classIsInitialized(JSProto_Function);

         JS_ASSERT(inited == classIsInitialized(JSProto_Object));

         return inited;

     }

     /*

      * Lazy standard classes need a way to indicate they have been initialized.

      * Otherwise, when we delete them, we might accidentally recreate them via

      * a lazy initialization. We use the presence of an object in the

      * getConstructor(key) reserved slot to indicate that they've been

      * initialized.

      *

      * Note: A few builtin objects, like JSON and Math, are not constructors,

      * so getConstructor is a bit of a misnomer.

      */

     bool isStandardClassResolved(JSProtoKey key) const {

         // If the constructor is undefined, then it hasn't been initialized.

         MOZ_ASSERT(getConstructor(key).isUndefined() ||

                    getConstructor(key).isObject());

         return !getConstructor(key).isUndefined();

     }

     bool isStandardClassResolved(const js::Class *clasp) const {

         JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);

         return isStandardClassResolved(key);

     }

   private:

     void setDetailsForKey(JSProtoKey key, JSObject *ctor, JSObject *proto) {

         JS_ASSERT(getConstructor(key).isUndefined());

         JS_ASSERT(getPrototype(key).isUndefined());

         JS_ASSERT(getConstructorPropertySlot(key).isUndefined());

         setConstructor(key, ObjectValue(*ctor));

         setPrototype(key, ObjectValue(*proto));

         setConstructorPropertySlot(key, ObjectValue(*ctor));

     }

     void setObjectClassDetails(JSFunction *ctor, JSObject *proto) {

         setDetailsForKey(JSProto_Object, ctor, proto);

     }

     void setFunctionClassDetails(JSFunction *ctor, JSObject *proto) {

         setDetailsForKey(JSProto_Function, ctor, proto);

     }

     bool arrayClassInitialized() const {

         return classIsInitialized(JSProto_Array);

     }

     bool booleanClassInitialized() const {

         return classIsInitialized(JSProto_Boolean);

     }

     bool numberClassInitialized() const {

         return classIsInitialized(JSProto_Number);

     }

     bool stringClassInitialized() const {

         return classIsInitialized(JSProto_String);

     }

     bool regexpClassInitialized() const {

         return classIsInitialized(JSProto_RegExp);

     }

     bool arrayBufferClassInitialized() const {

         return classIsInitialized(JSProto_ArrayBuffer);

     }

     bool sharedArrayBufferClassInitialized() const {

         return classIsInitialized(JSProto_SharedArrayBuffer);

     }

     bool errorClassesInitialized() const {

         return classIsInitialized(JSProto_Error);

     }

     bool dataViewClassInitialized() const {

         return classIsInitialized(JSProto_DataView);

     }

     bool typedArrayClassesInitialized() const {

         // This alias exists only for clarity: in reality all the typed array

         // classes constitute a (semi-)coherent whole.

         return classIsInitialized(JSProto_DataView);

     }

     Value createArrayFromBufferHelper(uint32_t slot) const {

         JS_ASSERT(typedArrayClassesInitialized());

         JS_ASSERT(FROM_BUFFER_UINT8 <= slot && slot <= FROM_BUFFER_UINT8CLAMPED);

         return getSlot(slot);

     }

     void setCreateArrayFromBufferHelper(uint32_t slot, Handle<JSFunction*> fun) {

         JS_ASSERT(getSlotRef(slot).isUndefined());

         setSlot(slot, ObjectValue(*fun));

     }

   public:

     /* XXX Privatize me! */

     void setCreateDataViewForThis(Handle<JSFunction*> fun) {

         JS_ASSERT(getSlotRef(CREATE_DATAVIEW_FOR_THIS).isUndefined());

         setSlot(CREATE_DATAVIEW_FOR_THIS, ObjectValue(*fun));

     }

     template<typename T>

     inline void setCreateArrayFromBuffer(Handle<JSFunction*> fun);

   public:

     static GlobalObject *create(JSContext *cx, const Class *clasp);

     /*

      * Create a constructor function with the specified name and length using

      * ctor, a method which creates objects with the given class.

      */

     JSFunction *

     createConstructor(JSContext *cx, JSNative ctor, JSAtom *name, unsigned length,

                       gc::AllocKind kind = JSFunction::FinalizeKind);

     /*

      * Create an object to serve as [[Prototype]] for instances of the given

      * class, using |Object.prototype| as its [[Prototype]].  Users creating

      * prototype objects with particular internal structure (e.g. reserved

      * slots guaranteed to contain values of particular types) must immediately

      * complete the minimal initialization to make the returned object safe to

      * touch.

      */

     JSObject *createBlankPrototype(JSContext *cx, const js::Class *clasp);

     /*

      * Identical to createBlankPrototype, but uses proto as the [[Prototype]]

      * of the returned blank prototype.

      */

     JSObject *createBlankPrototypeInheriting(JSContext *cx, const js::Class *clasp, JSObject &proto);

     JSObject *getOrCreateObjectPrototype(JSContext *cx) {

         if (functionObjectClassesInitialized())

             return &getPrototype(JSProto_Object).toObject();

         Rooted<GlobalObject*> self(cx, this);

         if (!initFunctionAndObjectClasses(cx))

             return nullptr;

         return &self->getPrototype(JSProto_Object).toObject();

     }

     JSObject *getOrCreateFunctionPrototype(JSContext *cx) {

         if (functionObjectClassesInitialized())

             return &getPrototype(JSProto_Function).toObject();

         Rooted<GlobalObject*> self(cx, this);

         if (!initFunctionAndObjectClasses(cx))

             return nullptr;

         return &self->getPrototype(JSProto_Function).toObject();

     }

     static JSObject *getOrCreateArrayPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_Array))

             return nullptr;

         return &global->getPrototype(JSProto_Array).toObject();

     }

     JSObject *maybeGetArrayPrototype() {

         if (arrayClassInitialized())

             return &getPrototype(JSProto_Array).toObject();

         return nullptr;

     }

     static JSObject *getOrCreateBooleanPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_Boolean))

             return nullptr;

         return &global->getPrototype(JSProto_Boolean).toObject();

     }

     static JSObject *getOrCreateNumberPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_Number))

             return nullptr;

         return &global->getPrototype(JSProto_Number).toObject();

     }

     static JSObject *getOrCreateStringPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_String))

             return nullptr;

         return &global->getPrototype(JSProto_String).toObject();

     }

     static JSObject *getOrCreateRegExpPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_RegExp))

             return nullptr;

         return &global->getPrototype(JSProto_RegExp).toObject();

     }

     JSObject *maybeGetRegExpPrototype() {

         if (regexpClassInitialized())

             return &getPrototype(JSProto_RegExp).toObject();

         return nullptr;

     }

     static JSObject *getOrCreateArrayBufferPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_ArrayBuffer))

             return nullptr;

         return &global->getPrototype(JSProto_ArrayBuffer).toObject();

     }

     JSObject *getOrCreateSharedArrayBufferPrototype(JSContext *cx, Handle<GlobalObject*> global) {

         if (!ensureConstructor(cx, global, JSProto_SharedArrayBuffer))

             return nullptr;

         return &global->getPrototype(JSProto_SharedArrayBuffer).toObject();

     }

     static JSObject *getOrCreateCustomErrorPrototype(JSContext *cx,

                                                      Handle<GlobalObject*> global,

                                                      JSExnType exnType)

     {

         JSProtoKey key = GetExceptionProtoKey(exnType);

         if (!ensureConstructor(cx, global, key))

             return nullptr;

         return &global->getPrototype(key).toObject();

     }

     JSObject *getOrCreateIntlObject(JSContext *cx) {

         return getOrCreateObject(cx, APPLICATION_SLOTS + JSProto_Intl, initIntlObject);

     }

     JSObject *getOrCreateTypedObjectModule(JSContext *cx) {

         return getOrCreateObject(cx, APPLICATION_SLOTS + JSProto_TypedObject, initTypedObjectModule);

     }

     void setFloat32x4TypeDescr(JSObject &obj) {

         JS_ASSERT(getSlotRef(FLOAT32X4_TYPE_DESCR).isUndefined());

         setSlot(FLOAT32X4_TYPE_DESCR, ObjectValue(obj));

     }

     JSObject &float32x4TypeDescr() {

         JS_ASSERT(getSlotRef(FLOAT32X4_TYPE_DESCR).isObject());

         return getSlotRef(FLOAT32X4_TYPE_DESCR).toObject();

     }

     void setInt32x4TypeDescr(JSObject &obj) {

         JS_ASSERT(getSlotRef(INT32X4_TYPE_DESCR).isUndefined());

         setSlot(INT32X4_TYPE_DESCR, ObjectValue(obj));

     }

     JSObject &int32x4TypeDescr() {

         JS_ASSERT(getSlotRef(INT32X4_TYPE_DESCR).isObject());

         return getSlotRef(INT32X4_TYPE_DESCR).toObject();

     }

     TypedObjectModuleObject &getTypedObjectModule() const;

     JSObject *getIteratorPrototype() {

         return &getPrototype(JSProto_Iterator).toObject();

     }

     JSObject *getOrCreateCollatorPrototype(JSContext *cx) {

         return getOrCreateObject(cx, COLLATOR_PROTO, initCollatorProto);

     }

     JSObject *getOrCreateNumberFormatPrototype(JSContext *cx) {

         return getOrCreateObject(cx, NUMBER_FORMAT_PROTO, initNumberFormatProto);

     }

     JSObject *getOrCreateDateTimeFormatPrototype(JSContext *cx) {

         return getOrCreateObject(cx, DATE_TIME_FORMAT_PROTO, initDateTimeFormatProto);

     }

   private:

     typedef bool (*ObjectInitOp)(JSContext *cx, Handle<GlobalObject*> global);

     JSObject *getOrCreateObject(JSContext *cx, unsigned slot, ObjectInitOp init) {

         Value v = getSlotRef(slot);

         if (v.isObject())

             return &v.toObject();

         Rooted<GlobalObject*> self(cx, this);

         if (!init(cx, self))

             return nullptr;

         return &self->getSlot(slot).toObject();

     }

   public:

     static JSObject *getOrCreateIteratorPrototype(JSContext *cx,

                                                   Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(APPLICATION_SLOTS + JSProto_LIMIT + JSProto_Iterator).toObject();

     }

     static JSObject *getOrCreateArrayIteratorPrototype(JSContext *cx,

                                                        Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(ARRAY_ITERATOR_PROTO).toObject();

     }

     static JSObject *getOrCreateStringIteratorPrototype(JSContext *cx,

                                                         Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(STRING_ITERATOR_PROTO).toObject();

     }

     static JSObject *getOrCreateLegacyGeneratorObjectPrototype(JSContext *cx,

                                                                Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(LEGACY_GENERATOR_OBJECT_PROTO).toObject();

     }

     static JSObject *getOrCreateStarGeneratorObjectPrototype(JSContext *cx,

                                                              Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(STAR_GENERATOR_OBJECT_PROTO).toObject();

     }

     static JSObject *getOrCreateStarGeneratorFunctionPrototype(JSContext *cx,

                                                                Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(APPLICATION_SLOTS + JSProto_LIMIT + JSProto_GeneratorFunction).toObject();

     }

     static JSObject *getOrCreateStarGeneratorFunction(JSContext *cx,

                                                       Handle<GlobalObject*> global)

     {

         if (!ensureConstructor(cx, global, JSProto_Iterator))

             return nullptr;

         return &global->getSlot(APPLICATION_SLOTS + JSProto_GeneratorFunction).toObject();

     }

     static JSObject *getOrCreateMapIteratorPrototype(JSContext *cx,

                                                      Handle<GlobalObject*> global)

     {

         return global->getOrCreateObject(cx, MAP_ITERATOR_PROTO, initMapIteratorProto);

     }

     static JSObject *getOrCreateSetIteratorPrototype(JSContext *cx,

                                                      Handle<GlobalObject*> global)

     {

         return global->getOrCreateObject(cx, SET_ITERATOR_PROTO, initSetIteratorProto);

     }

     JSObject *getOrCreateDataViewPrototype(JSContext *cx) {

         Rooted<GlobalObject*> self(cx, this);

         if (!ensureConstructor(cx, self, JSProto_DataView))

             return nullptr;

         return &self->getPrototype(JSProto_DataView).toObject();

     }

     JSObject *intrinsicsHolder() {

         JS_ASSERT(!getSlot(INTRINSICS).isUndefined());

         return &getSlot(INTRINSICS).toObject();

     }

     bool maybeGetIntrinsicValue(jsid id, Value *vp) {

         JSObject *holder = intrinsicsHolder();

         if (Shape *shape = holder->nativeLookupPure(id)) {

             *vp = holder->getSlot(shape->slot());

             return true;

         }

         return false;

     }

     bool maybeGetIntrinsicValue(PropertyName *name, Value *vp) {

         return maybeGetIntrinsicValue(NameToId(name), vp);

     }

     static bool getIntrinsicValue(JSContext *cx, Handle<GlobalObject*> global,

                                   HandlePropertyName name, MutableHandleValue value)

     {

         if (global->maybeGetIntrinsicValue(name, value.address()))

             return true;

         if (!cx->runtime()->cloneSelfHostedValue(cx, name, value))

             return false;

         RootedId id(cx, NameToId(name));

         return global->addIntrinsicValue(cx, id, value);

     }

     bool addIntrinsicValue(JSContext *cx, HandleId id, HandleValue value);

     bool setIntrinsicValue(JSContext *cx, PropertyName *name, HandleValue value) {

 #ifdef DEBUG

         RootedObject self(cx, this);

         JS_ASSERT(cx->runtime()->isSelfHostingGlobal(self));

 #endif

         RootedObject holder(cx, intrinsicsHolder());

         RootedValue valCopy(cx, value);

         return JSObject::setProperty(cx, holder, holder, name, &valCopy, false);

     }

     bool getSelfHostedFunction(JSContext *cx, HandleAtom selfHostedName, HandleAtom name,

                                unsigned nargs, MutableHandleValue funVal);

     RegExpStatics *getRegExpStatics() const {

         JSObject &resObj = getSlot(REGEXP_STATICS).toObject();

         return static_cast<RegExpStatics *>(resObj.getPrivate(/* nfixed = */ 1));

     }

     JSObject *getThrowTypeError() const {

         JS_ASSERT(functionObjectClassesInitialized());

         return &getSlot(THROWTYPEERROR).toObject();

     }

     Value createDataViewForThis() const {

         JS_ASSERT(dataViewClassInitialized());

         return getSlot(CREATE_DATAVIEW_FOR_THIS);

     }

     template<typename T>

     inline Value createArrayFromBuffer() const;

     Value protoGetter() const {

         JS_ASSERT(functionObjectClassesInitialized());

         return getSlot(PROTO_GETTER);

     }

     static bool isRuntimeCodeGenEnabled(JSContext *cx, Handle<GlobalObject*> global);

     // Warn about use of the deprecated watch/unwatch functions in the global

     // in which |obj| was created, if no prior warning was given.

     static bool warnOnceAboutWatch(JSContext *cx, HandleObject obj) {

         // Temporarily disabled until we've provided a watch/unwatch workaround for

         // debuggers like Firebug (bug 934669).

         //return warnOnceAbout(cx, obj, WARNED_WATCH_DEPRECATED, JSMSG_OBJECT_WATCH_DEPRECATED);

         return true;

     }

     // Warn about use of the given __proto__ setter to attempt to mutate an

     // object's [[Prototype]], if no prior warning was given.

     static bool warnOnceAboutPrototypeMutation(JSContext *cx, HandleObject protoSetter) {

         return warnOnceAbout(cx, protoSetter, WARNED_PROTO_SETTING_SLOW, JSMSG_PROTO_SETTING_SLOW);

     }

     static bool getOrCreateEval(JSContext *cx, Handle<GlobalObject*> global,

                                 MutableHandleObject eval);

     // Infallibly test whether the given value is the eval function for this global.

     bool valueIsEval(Value val);

     // Implemented in jsiter.cpp.

     static bool initIteratorClasses(JSContext *cx, Handle<GlobalObject*> global);

     // Implemented in builtin/MapObject.cpp.

     static bool initMapIteratorProto(JSContext *cx, Handle<GlobalObject*> global);

     static bool initSetIteratorProto(JSContext *cx, Handle<GlobalObject*> global);

     // Implemented in Intl.cpp.

     static bool initIntlObject(JSContext *cx, Handle<GlobalObject*> global);

     static bool initCollatorProto(JSContext *cx, Handle<GlobalObject*> global);

     static bool initNumberFormatProto(JSContext *cx, Handle<GlobalObject*> global);

     static bool initDateTimeFormatProto(JSContext *cx, Handle<GlobalObject*> global);

     // Implemented in builtin/TypedObject.cpp

     static bool initTypedObjectModule(JSContext *cx, Handle<GlobalObject*> global);

     static bool initStandardClasses(JSContext *cx, Handle<GlobalObject*> global);

     typedef js::Vector<js::Debugger *, 0, js::SystemAllocPolicy> DebuggerVector;

     /*

      * The collection of Debugger objects debugging this global. If this global

      * is not a debuggee, this returns either nullptr or an empty vector.

      */

     DebuggerVector *getDebuggers();

     /*

      * The same, but create the empty vector if one does not already

      * exist. Returns nullptr only on OOM.

      */

     static DebuggerVector *getOrCreateDebuggers(JSContext *cx, Handle<GlobalObject*> global);

     inline JSObject *getForOfPICObject() {

         Value forOfPIC = getReservedSlot(FOR_OF_PIC_CHAIN);

         if (forOfPIC.isUndefined())

             return nullptr;

         return &forOfPIC.toObject();

     }

     static JSObject *getOrCreateForOfPICObject(JSContext *cx, Handle<GlobalObject*> global);

     static bool addDebugger(JSContext *cx, Handle<GlobalObject*> global, Debugger *dbg);

 };

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<uint8_t>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_UINT8, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<int8_t>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_INT8, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<uint16_t>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_UINT16, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<int16_t>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_INT16, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<uint32_t>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_UINT32, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<int32_t>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_INT32, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<float>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_FLOAT32, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<double>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_FLOAT64, fun);

 }

 template<>

 inline void

 GlobalObject::setCreateArrayFromBuffer<uint8_clamped>(Handle<JSFunction*> fun)

 {

     setCreateArrayFromBufferHelper(FROM_BUFFER_UINT8CLAMPED, fun);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<uint8_t>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_UINT8);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<int8_t>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_INT8);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<uint16_t>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_UINT16);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<int16_t>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_INT16);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<uint32_t>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_UINT32);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<int32_t>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_INT32);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<float>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_FLOAT32);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<double>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_FLOAT64);

 }

 template<>

 inline Value

 GlobalObject::createArrayFromBuffer<uint8_clamped>() const

 {

     return createArrayFromBufferHelper(FROM_BUFFER_UINT8CLAMPED);

 }

 /*

  * Define ctor.prototype = proto as non-enumerable, non-configurable, and

  * non-writable; define proto.constructor = ctor as non-enumerable but

  * configurable and writable.

  */

 extern bool

 LinkConstructorAndPrototype(JSContext *cx, JSObject *ctor, JSObject *proto);

 /*

  * Define properties, then functions, on the object, then brand for tracing

  * benefits.

  */

 extern bool

 DefinePropertiesAndBrand(JSContext *cx, JSObject *obj,

                          const JSPropertySpec *ps, const JSFunctionSpec *fs);

 typedef HashSet<GlobalObject *, DefaultHasher<GlobalObject *>, SystemAllocPolicy> GlobalObjectSet;

 /*

  * Convenience templates to generic constructor and prototype creation functions

  * for ClassSpecs.

  */

 template<JSNative ctor, size_t atomOffset, unsigned length>

 JSObject *

 GenericCreateConstructor(JSContext *cx, JSProtoKey key)

 {

     JSAtom *atom = AtomStateOffsetToName(cx->names(), atomOffset);

     return cx->global()->createConstructor(cx, ctor, atom, length);

 }

 template<const Class *clasp>

 JSObject *

 GenericCreatePrototype(JSContext *cx, JSProtoKey key)

 {

     return cx->global()->createBlankPrototype(cx, clasp);

 }

 } // namespace js

 template<>

 inline bool

 JSObject::is<js::GlobalObject>() const

 {

     return !!(getClass()->flags & JSCLASS_IS_GLOBAL);

 }

 #endif /* vm_GlobalObject_h */