The Tor Browser: js/src/vm/GlobalObject.h@6474c204b198 (annotated)

js/src/vm/GlobalObject.h@6474c204b198 (annotated)

js/src/vm/GlobalObject.h

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/. */
 #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 */

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js/src/vm/GlobalObject.h