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Mypal/js/src/vm/GlobalObject.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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"
#include "vm/RegExpStatics.h"
#include "vm/Runtime.h"
namespace js {
class Debugger;
class TypedObjectModuleObject;
class LexicalEnvironmentObject;
class SimdTypeDescr;
enum class SimdType;
/*
* 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, 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 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 actual (writable and even deletable)
* Object, Array, &c. properties are not stored in reserved slots.
*/
class GlobalObject : public NativeObject
{
/* Count of slots set aside for application use. */
static const unsigned APPLICATION_SLOTS = JSCLASS_GLOBAL_APPLICATION_SLOTS;
/*
* Count of slots to store built-in prototypes and initial visible
* properties for the constructors.
*/
static const unsigned STANDARD_CLASS_SLOTS = JSProto_LIMIT * 2;
enum : unsigned {
/* Various function values needed by the engine. */
EVAL = APPLICATION_SLOTS + STANDARD_CLASS_SLOTS,
CREATE_DATAVIEW_FOR_THIS,
THROWTYPEERROR,
/*
* Instances of the internal createArrayFromBuffer function used by the
* typed array code, one per typed array element type.
*/
FROM_BUFFER_UINT8,
FROM_BUFFER_INT8,
FROM_BUFFER_UINT16,
FROM_BUFFER_INT16,
FROM_BUFFER_UINT32,
FROM_BUFFER_INT32,
FROM_BUFFER_FLOAT32,
FROM_BUFFER_FLOAT64,
FROM_BUFFER_UINT8CLAMPED,
/* One-off properties stored after slots for built-ins. */
LEXICAL_ENVIRONMENT,
EMPTY_GLOBAL_SCOPE,
ITERATOR_PROTO,
ARRAY_ITERATOR_PROTO,
STRING_ITERATOR_PROTO,
REGEXP_STRING_ITERATOR_PROTO,
LEGACY_GENERATOR_OBJECT_PROTO,
STAR_GENERATOR_OBJECT_PROTO,
STAR_GENERATOR_FUNCTION_PROTO,
STAR_GENERATOR_FUNCTION,
ASYNC_FUNCTION_PROTO,
ASYNC_FUNCTION,
ASYNC_ITERATOR_PROTO,
ASYNC_FROM_SYNC_ITERATOR_PROTO,
ASYNC_GENERATOR,
ASYNC_GENERATOR_FUNCTION,
ASYNC_GENERATOR_PROTO,
MAP_ITERATOR_PROTO,
SET_ITERATOR_PROTO,
COLLATOR_PROTO,
NUMBER_FORMAT_PROTO,
DATE_TIME_FORMAT_PROTO,
PLURAL_RULES_PROTO,
MODULE_PROTO,
IMPORT_ENTRY_PROTO,
EXPORT_ENTRY_PROTO,
REGEXP_STATICS,
WARNED_ONCE_FLAGS,
RUNTIME_CODEGEN_ENABLED,
DEBUGGERS,
INTRINSICS,
FOR_OF_PIC_CHAIN,
WINDOW_PROXY,
GLOBAL_THIS_RESOLVED,
/* Total reserved-slot count for global objects. */
RESERVED_SLOTS
};
/*
* 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");
enum WarnOnceFlag : int32_t {
WARN_WATCH_DEPRECATED = 1 << 0,
WARN_ARRAYBUFFER_SLICE_DEPRECATED = 1 << 1,
};
// 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, WarnOnceFlag flag, unsigned errorNumber);
public:
LexicalEnvironmentObject& lexicalEnvironment() const;
GlobalScope& emptyGlobalScope() const;
void setThrowTypeError(JSFunction* fun) {
MOZ_ASSERT(getSlotRef(THROWTYPEERROR).isUndefined());
setSlot(THROWTYPEERROR, ObjectValue(*fun));
}
void setOriginalEval(JSObject* evalobj) {
MOZ_ASSERT(getSlotRef(EVAL).isUndefined());
setSlot(EVAL, ObjectValue(*evalobj));
}
Value getConstructor(JSProtoKey key) const {
MOZ_ASSERT(key <= JSProto_LIMIT);
return getSlot(APPLICATION_SLOTS + key);
}
static bool skipDeselectedConstructor(JSContext* cx, JSProtoKey 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);
static bool maybeResolveGlobalThis(JSContext* cx, Handle<GlobalObject*> global, bool* resolved);
void setConstructor(JSProtoKey key, const Value& v) {
MOZ_ASSERT(key <= JSProto_LIMIT);
setSlot(APPLICATION_SLOTS + key, v);
}
Value getPrototype(JSProtoKey key) const {
MOZ_ASSERT(key <= JSProto_LIMIT);
return getSlot(APPLICATION_SLOTS + JSProto_LIMIT + key);
}
void setPrototype(JSProtoKey key, const Value& value) {
MOZ_ASSERT(key <= JSProto_LIMIT);
setSlot(APPLICATION_SLOTS + JSProto_LIMIT + key, value);
}
bool classIsInitialized(JSProtoKey key) const {
bool inited = !getConstructor(key).isUndefined();
MOZ_ASSERT(inited == !getPrototype(key).isUndefined());
return inited;
}
bool functionObjectClassesInitialized() const {
bool inited = classIsInitialized(JSProto_Function);
MOZ_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();
}
/*
* Using a Handle<GlobalObject*> as a Handle<Object*> is always safe as
* GlobalObject derives JSObject. However, with C++'s semantics, Handle<T>
* is not related to Handle<S>, independent of how S and T are related.
* Further, Handle stores an indirect pointer and, again because of C++'s
* semantics, T** is not related to S**, independent of how S and T are
* related. Since we know that this specific case is safe, we provide a
* manual upcast operation here to do the reinterpret_cast in a known-safe
* manner.
*/
static HandleObject upcast(Handle<GlobalObject*> global) {
return HandleObject::fromMarkedLocation(
reinterpret_cast<JSObject * const*>(global.address()));
}
private:
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);
}
Value createArrayFromBufferHelper(uint32_t slot) const {
MOZ_ASSERT(FROM_BUFFER_UINT8 <= slot && slot <= FROM_BUFFER_UINT8CLAMPED);
return getSlot(slot);
}
void setCreateArrayFromBufferHelper(uint32_t slot, Handle<JSFunction*> fun) {
MOZ_ASSERT(getSlotRef(slot).isUndefined());
setSlot(slot, ObjectValue(*fun));
}
public:
/* XXX Privatize me! */
void setCreateDataViewForThis(Handle<JSFunction*> fun) {
MOZ_ASSERT(getSlotRef(CREATE_DATAVIEW_FOR_THIS).isUndefined());
setSlot(CREATE_DATAVIEW_FOR_THIS, ObjectValue(*fun));
}
template<typename T>
inline void setCreateArrayFromBuffer(Handle<JSFunction*> fun);
private:
// Disallow use of unqualified JSObject::create in GlobalObject.
static GlobalObject* create(...) = delete;
friend struct ::JSRuntime;
static GlobalObject* createInternal(JSContext* cx, const Class* clasp);
public:
static GlobalObject*
new_(JSContext* cx, const Class* clasp, JSPrincipals* principals,
JS::OnNewGlobalHookOption hookOption, const JS::CompartmentOptions& options);
/*
* Create a constructor function with the specified name and length using
* ctor, a method which creates objects with the given class.
*/
static JSFunction*
createConstructor(JSContext* cx, JSNative ctor, JSAtom* name, unsigned length,
gc::AllocKind kind = gc::AllocKind::FUNCTION,
const JSJitInfo* jitInfo = nullptr);
/*
* 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.
*/
static NativeObject*
createBlankPrototype(JSContext* cx, Handle<GlobalObject*> global, const js::Class* clasp);
/*
* Identical to createBlankPrototype, but uses proto as the [[Prototype]]
* of the returned blank prototype.
*/
static NativeObject*
createBlankPrototypeInheriting(JSContext* cx, Handle<GlobalObject*> global,
const js::Class* clasp, HandleObject proto);
template <typename T>
static T*
createBlankPrototype(JSContext* cx, Handle<GlobalObject*> global) {
NativeObject* res = createBlankPrototype(cx, global, &T::class_);
return res ? &res->template as<T>() : nullptr;
}
static NativeObject*
getOrCreateObjectPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (global->functionObjectClassesInitialized())
return &global->getPrototype(JSProto_Object).toObject().as<NativeObject>();
if (!ensureConstructor(cx, global, JSProto_Object))
return nullptr;
return &global->getPrototype(JSProto_Object).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateFunctionPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (global->functionObjectClassesInitialized())
return &global->getPrototype(JSProto_Function).toObject().as<NativeObject>();
if (!ensureConstructor(cx, global, JSProto_Object))
return nullptr;
return &global->getPrototype(JSProto_Function).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateArrayPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Array))
return nullptr;
return &global->getPrototype(JSProto_Array).toObject().as<NativeObject>();
}
NativeObject* maybeGetArrayPrototype() {
if (arrayClassInitialized())
return &getPrototype(JSProto_Array).toObject().as<NativeObject>();
return nullptr;
}
static NativeObject*
getOrCreateBooleanPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Boolean))
return nullptr;
return &global->getPrototype(JSProto_Boolean).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateNumberPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Number))
return nullptr;
return &global->getPrototype(JSProto_Number).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateStringPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_String))
return nullptr;
return &global->getPrototype(JSProto_String).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateSymbolPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Symbol))
return nullptr;
return &global->getPrototype(JSProto_Symbol).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreatePromisePrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Promise))
return nullptr;
return &global->getPrototype(JSProto_Promise).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateRegExpPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_RegExp))
return nullptr;
return &global->getPrototype(JSProto_RegExp).toObject().as<NativeObject>();
}
JSObject* maybeGetRegExpPrototype() {
if (regexpClassInitialized())
return &getPrototype(JSProto_RegExp).toObject();
return nullptr;
}
static NativeObject*
getOrCreateSavedFramePrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_SavedFrame))
return nullptr;
return &global->getPrototype(JSProto_SavedFrame).toObject().as<NativeObject>();
}
static JSObject*
getOrCreateArrayBufferPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_ArrayBuffer))
return nullptr;
return &global->getPrototype(JSProto_ArrayBuffer).toObject();
}
static 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();
}
static JSFunction*
getOrCreateErrorConstructor(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Error))
return nullptr;
return &global->getConstructor(JSProto_Error).toObject().as<JSFunction>();
}
static JSObject*
getOrCreateErrorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateCustomErrorPrototype(cx, global, JSEXN_ERR);
}
static NativeObject*
getOrCreateSetPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Set))
return nullptr;
return &global->getPrototype(JSProto_Set).toObject().as<NativeObject>();
}
static NativeObject*
getOrCreateWeakSetPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_WeakSet))
return nullptr;
return &global->getPrototype(JSProto_WeakSet).toObject().as<NativeObject>();
}
static JSObject*
getOrCreateIntlObject(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, APPLICATION_SLOTS + JSProto_Intl, initIntlObject);
}
static JSObject*
getOrCreateTypedObjectModule(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, APPLICATION_SLOTS + JSProto_TypedObject,
initTypedObjectModule);
}
static JSObject*
getOrCreateSimdGlobalObject(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, APPLICATION_SLOTS + JSProto_SIMD, initSimdObject);
}
// Get the type descriptor for one of the SIMD types.
// simdType is one of the JS_SIMDTYPEREPR_* constants.
// Implemented in builtin/SIMD.cpp.
static SimdTypeDescr*
getOrCreateSimdTypeDescr(JSContext* cx, Handle<GlobalObject*> global, SimdType simdType);
TypedObjectModuleObject& getTypedObjectModule() const;
JSObject* getLegacyIteratorPrototype() {
return &getPrototype(JSProto_Iterator).toObject();
}
static JSObject*
getOrCreateCollatorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, COLLATOR_PROTO, initIntlObject);
}
static JSObject*
getOrCreateNumberFormatPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, NUMBER_FORMAT_PROTO, initIntlObject);
}
static JSObject*
getOrCreateDateTimeFormatPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, DATE_TIME_FORMAT_PROTO, initIntlObject);
}
static JSObject*
getOrCreatePluralRulesPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, PLURAL_RULES_PROTO, initIntlObject);
}
static bool ensureModulePrototypesCreated(JSContext *cx, Handle<GlobalObject*> global);
JSObject* maybeGetModulePrototype() {
Value value = getSlot(MODULE_PROTO);
return value.isUndefined() ? nullptr : &value.toObject();
}
JSObject* maybeGetImportEntryPrototype() {
Value value = getSlot(IMPORT_ENTRY_PROTO);
return value.isUndefined() ? nullptr : &value.toObject();
}
JSObject* maybeGetExportEntryPrototype() {
Value value = getSlot(EXPORT_ENTRY_PROTO);
return value.isUndefined() ? nullptr : &value.toObject();
}
JSObject* getModulePrototype() {
JSObject* proto = maybeGetModulePrototype();
MOZ_ASSERT(proto);
return proto;
}
JSObject* getImportEntryPrototype() {
JSObject* proto = maybeGetImportEntryPrototype();
MOZ_ASSERT(proto);
return proto;
}
JSObject* getExportEntryPrototype() {
JSObject* proto = maybeGetExportEntryPrototype();
MOZ_ASSERT(proto);
return proto;
}
static JSFunction*
getOrCreateTypedArrayConstructor(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_TypedArray))
return nullptr;
return &global->getConstructor(JSProto_TypedArray).toObject().as<JSFunction>();
}
static JSObject*
getOrCreateTypedArrayPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_TypedArray))
return nullptr;
return &global->getPrototype(JSProto_TypedArray).toObject();
}
private:
typedef bool (*ObjectInitOp)(JSContext* cx, Handle<GlobalObject*> global);
static JSObject*
getOrCreateObject(JSContext* cx, Handle<GlobalObject*> global, unsigned slot,
ObjectInitOp init)
{
Value v = global->getSlotRef(slot);
if (v.isObject())
return &v.toObject();
if (!init(cx, global))
return nullptr;
return &global->getSlot(slot).toObject();
}
public:
static NativeObject*
getOrCreateIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ITERATOR_PROTO, initIteratorProto));
}
static NativeObject*
getOrCreateArrayIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ARRAY_ITERATOR_PROTO,
initArrayIteratorProto));
}
static NativeObject*
getOrCreateStringIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, STRING_ITERATOR_PROTO,
initStringIteratorProto));
}
static NativeObject*
getOrCreateRegExpStringIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, REGEXP_STRING_ITERATOR_PROTO,
initRegExpStringIteratorProto));
}
static NativeObject*
getOrCreateLegacyGeneratorObjectPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, LEGACY_GENERATOR_OBJECT_PROTO,
initLegacyGeneratorProto));
}
static NativeObject*
getOrCreateStarGeneratorObjectPrototype(JSContext* cx, Handle<GlobalObject*> global)
{
return MaybeNativeObject(getOrCreateObject(cx, global, STAR_GENERATOR_OBJECT_PROTO,
initStarGenerators));
}
static NativeObject*
getOrCreateStarGeneratorFunctionPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, STAR_GENERATOR_FUNCTION_PROTO,
initStarGenerators));
}
static JSObject*
getOrCreateStarGeneratorFunction(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, STAR_GENERATOR_FUNCTION, initStarGenerators);
}
static NativeObject*
getOrCreateAsyncFunctionPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_FUNCTION_PROTO,
initAsyncFunction));
}
static JSObject*
getOrCreateAsyncFunction(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, ASYNC_FUNCTION, initAsyncFunction);
}
static NativeObject*
getOrCreateAsyncIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global)
{
return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_ITERATOR_PROTO,
initAsyncGenerators));
}
static NativeObject*
getOrCreateAsyncFromSyncIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_FROM_SYNC_ITERATOR_PROTO,
initAsyncGenerators));
}
static NativeObject*
getOrCreateAsyncGenerator(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_GENERATOR,
initAsyncGenerators));
}
static JSObject*
getOrCreateAsyncGeneratorFunction(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, ASYNC_GENERATOR_FUNCTION, initAsyncGenerators);
}
static NativeObject*
getOrCreateAsyncGeneratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_GENERATOR_PROTO,
initAsyncGenerators));
}
static JSObject*
getOrCreateMapIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, MAP_ITERATOR_PROTO, initMapIteratorProto);
}
static JSObject*
getOrCreateSetIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
return getOrCreateObject(cx, global, SET_ITERATOR_PROTO, initSetIteratorProto);
}
static JSObject*
getOrCreateDataViewPrototype(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_DataView))
return nullptr;
return &global->getPrototype(JSProto_DataView).toObject();
}
static JSFunction*
getOrCreatePromiseConstructor(JSContext* cx, Handle<GlobalObject*> global) {
if (!ensureConstructor(cx, global, JSProto_Promise))
return nullptr;
return &global->getConstructor(JSProto_Promise).toObject().as<JSFunction>();
}
static NativeObject* getIntrinsicsHolder(JSContext* cx, Handle<GlobalObject*> global);
bool maybeExistingIntrinsicValue(PropertyName* name, Value* vp) {
Value slot = getReservedSlot(INTRINSICS);
// If we're in the self-hosting compartment itself, the
// intrinsics-holder isn't initialized at this point.
if (slot.isUndefined()) {
*vp = UndefinedValue();
return false;
}
NativeObject* holder = &slot.toObject().as<NativeObject>();
Shape* shape = holder->lookupPure(name);
if (!shape) {
*vp = UndefinedValue();
return false;
}
*vp = holder->getSlot(shape->slot());
return true;
}
Value existingIntrinsicValue(PropertyName* name) {
Value val;
mozilla::DebugOnly<bool> exists = maybeExistingIntrinsicValue(name, &val);
MOZ_ASSERT(exists, "intrinsic must already have been added to holder");
return val;
}
static bool
maybeGetIntrinsicValue(JSContext* cx, Handle<GlobalObject*> global, Handle<PropertyName*> name,
MutableHandleValue vp, bool* exists)
{
NativeObject* holder = getIntrinsicsHolder(cx, global);
if (!holder)
return false;
if (Shape* shape = holder->lookupPure(name)) {
vp.set(holder->getSlot(shape->slot()));
*exists = true;
} else {
*exists = false;
}
return true;
}
static bool
getIntrinsicValue(JSContext* cx, Handle<GlobalObject*> global,
HandlePropertyName name, MutableHandleValue value)
{
bool exists = false;
if (!GlobalObject::maybeGetIntrinsicValue(cx, global, name, value, &exists))
return false;
if (exists)
return true;
if (!cx->runtime()->cloneSelfHostedValue(cx, name, value))
return false;
return GlobalObject::addIntrinsicValue(cx, global, name, value);
}
static bool addIntrinsicValue(JSContext* cx, Handle<GlobalObject*> global,
HandlePropertyName name, HandleValue value);
static bool setIntrinsicValue(JSContext* cx, Handle<GlobalObject*> global,
HandlePropertyName name, HandleValue value)
{
MOZ_ASSERT(cx->runtime()->isSelfHostingGlobal(global));
RootedObject holder(cx, GlobalObject::getIntrinsicsHolder(cx, global));
if (!holder)
return false;
return SetProperty(cx, holder, name, value);
}
static bool getSelfHostedFunction(JSContext* cx, Handle<GlobalObject*> global,
HandlePropertyName selfHostedName, HandleAtom name,
unsigned nargs, MutableHandleValue funVal);
bool hasRegExpStatics() const;
static RegExpStatics* getRegExpStatics(ExclusiveContext* cx,
Handle<GlobalObject*> global);
RegExpStatics* getAlreadyCreatedRegExpStatics() const;
JSObject* getThrowTypeError() const {
const Value v = getReservedSlot(THROWTYPEERROR);
MOZ_ASSERT(v.isObject(),
"attempting to access [[ThrowTypeError]] too early");
return &v.toObject();
}
Value createDataViewForThis() const {
MOZ_ASSERT(dataViewClassInitialized());
return getSlot(CREATE_DATAVIEW_FOR_THIS);
}
template<typename T>
inline Value createArrayFromBuffer() const;
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, WARN_WATCH_DEPRECATED, JSMSG_OBJECT_WATCH_DEPRECATED);
return true;
}
// Warn about use of the deprecated (static) ArrayBuffer.slice method.
static bool warnOnceAboutArrayBufferSlice(JSContext* cx, HandleObject obj) {
return warnOnceAbout(cx, obj, WARN_ARRAYBUFFER_SLICE_DEPRECATED,
JSMSG_ARRAYBUFFER_SLICE_DEPRECATED);
}
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(const Value& val);
// Implemented in jsiter.cpp.
static bool initIteratorProto(JSContext* cx, Handle<GlobalObject*> global);
static bool initArrayIteratorProto(JSContext* cx, Handle<GlobalObject*> global);
static bool initStringIteratorProto(JSContext* cx, Handle<GlobalObject*> global);
static bool initRegExpStringIteratorProto(JSContext* cx, Handle<GlobalObject*> global);
// Implemented in vm/GeneratorObject.cpp.
static bool initLegacyGeneratorProto(JSContext* cx, Handle<GlobalObject*> global);
static bool initStarGenerators(JSContext* cx, Handle<GlobalObject*> global);
static bool initAsyncFunction(JSContext* cx, Handle<GlobalObject*> global);
static bool initAsyncGenerators(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);
// Implemented in builtin/ModuleObject.cpp
static bool initModuleProto(JSContext* cx, Handle<GlobalObject*> global);
static bool initImportEntryProto(JSContext* cx, Handle<GlobalObject*> global);
static bool initExportEntryProto(JSContext* cx, Handle<GlobalObject*> global);
// Implemented in builtin/TypedObject.cpp
static bool initTypedObjectModule(JSContext* cx, Handle<GlobalObject*> global);
// Implemented in builtin/SIMD.cpp
static bool initSimdObject(JSContext* cx, Handle<GlobalObject*> global);
static bool initSimdType(JSContext* cx, Handle<GlobalObject*> global, SimdType simdType);
static bool initStandardClasses(JSContext* cx, Handle<GlobalObject*> global);
static bool initSelfHostingBuiltins(JSContext* cx, Handle<GlobalObject*> global,
const JSFunctionSpec* builtins);
typedef js::Vector<js::ReadBarriered<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() const;
/*
* 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 NativeObject* getForOfPICObject() {
Value forOfPIC = getReservedSlot(FOR_OF_PIC_CHAIN);
if (forOfPIC.isUndefined())
return nullptr;
return &forOfPIC.toObject().as<NativeObject>();
}
static NativeObject* getOrCreateForOfPICObject(JSContext* cx, Handle<GlobalObject*> global);
JSObject* windowProxy() const {
return &getReservedSlot(WINDOW_PROXY).toObject();
}
JSObject* maybeWindowProxy() const {
Value v = getReservedSlot(WINDOW_PROXY);
MOZ_ASSERT(v.isObject() || v.isUndefined());
return v.isObject() ? &v.toObject() : nullptr;
}
void setWindowProxy(JSObject* windowProxy) {
setReservedSlot(WINDOW_PROXY, ObjectValue(*windowProxy));
}
// Returns either this global's star-generator function prototype, or null
// if that object was never created. Dodgy; for use only in also-dodgy
// GlobalHelperThreadState::mergeParseTaskCompartment().
JSObject* getStarGeneratorFunctionPrototype();
};
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);
}
/*
* Unless otherwise specified, define ctor.prototype = proto as non-enumerable,
* non-configurable, and non-writable; and define proto.constructor = ctor as
* non-enumerable but configurable and writable.
*/
extern bool
LinkConstructorAndPrototype(JSContext* cx, JSObject* ctor, JSObject* proto,
unsigned prototypeAttrs = JSPROP_PERMANENT | JSPROP_READONLY,
unsigned constructorAttrs = 0);
/*
* Define properties and/or functions on any object. Either ps or fs, or both,
* may be null.
*/
extern bool
DefinePropertiesAndFunctions(JSContext* cx, HandleObject obj,
const JSPropertySpec* ps, const JSFunctionSpec* fs);
typedef HashSet<GlobalObject*, DefaultHasher<GlobalObject*>, SystemAllocPolicy> GlobalObjectSet;
extern bool
DefineToStringTag(JSContext *cx, HandleObject obj, JSAtom* tag);
/*
* Convenience templates to generic constructor and prototype creation functions
* for ClassSpecs.
*/
template<JSNative ctor, unsigned length, gc::AllocKind kind, const JSJitInfo* jitInfo = nullptr>
JSObject*
GenericCreateConstructor(JSContext* cx, JSProtoKey key)
{
// Note - We duplicate the trick from ClassName() so that we don't need to
// include jsatominlines.h here.
PropertyName* name = (&cx->names().Null)[key];
return GlobalObject::createConstructor(cx, ctor, name, length, kind, jitInfo);
}
inline JSObject*
GenericCreatePrototype(JSContext* cx, JSProtoKey key)
{
MOZ_ASSERT(key != JSProto_Object);
const Class* clasp = ProtoKeyToClass(key);
MOZ_ASSERT(clasp);
JSProtoKey protoKey = InheritanceProtoKeyForStandardClass(key);
if (!GlobalObject::ensureConstructor(cx, cx->global(), protoKey))
return nullptr;
RootedObject parentProto(cx, &cx->global()->getPrototype(protoKey).toObject());
return GlobalObject::createBlankPrototypeInheriting(cx, cx->global(), clasp, parentProto);
}
inline JSProtoKey
StandardProtoKeyOrNull(const JSObject* obj)
{
return JSCLASS_CACHED_PROTO_KEY(obj->getClass());
}
JSObject*
NewSingletonObjectWithFunctionPrototype(JSContext* cx, Handle<GlobalObject*> global);
} // namespace js
template<>
inline bool
JSObject::is<js::GlobalObject>() const
{
return !!(getClass()->flags & JSCLASS_IS_GLOBAL);
}
#endif /* vm_GlobalObject_h */
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