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

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

js/src/vm/TypedArrayObject.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_TypedArrayObject_h
 #define vm_TypedArrayObject_h
 #include "jsobj.h"
 #include "builtin/TypedObject.h"
 #include "gc/Barrier.h"
 #include "js/Class.h"
 #include "vm/ArrayBufferObject.h"
 typedef struct JSProperty JSProperty;
 namespace js {
 /*
  * TypedArrayObject
  *
  * The non-templated base class for the specific typed implementations.
  * This class holds all the member variables that are used by
  * the subclasses.
  */
 class TypedArrayObject : public ArrayBufferViewObject
 {
   protected:
     // Typed array properties stored in slots, beyond those shared by all
     // ArrayBufferViews.
     static const size_t LENGTH_SLOT    = JS_TYPEDOBJ_SLOT_LENGTH;
     static const size_t TYPE_SLOT      = JS_TYPEDOBJ_SLOT_TYPE_DESCR;
     static const size_t RESERVED_SLOTS = JS_TYPEDOBJ_SLOTS;
     static const size_t DATA_SLOT      = JS_TYPEDOBJ_SLOT_DATA;
     static_assert(js::detail::TypedArrayLengthSlot == LENGTH_SLOT,
                   "bad inlined constant in jsfriendapi.h");
   public:
     static const Class classes[ScalarTypeDescr::TYPE_MAX];
     static const Class protoClasses[ScalarTypeDescr::TYPE_MAX];
     static const size_t FIXED_DATA_START = DATA_SLOT + 1;
     // For typed arrays which can store their data inline, the array buffer
     // object is created lazily.
     static const uint32_t INLINE_BUFFER_LIMIT =
         (JSObject::MAX_FIXED_SLOTS - FIXED_DATA_START) * sizeof(Value);
     static gc::AllocKind
     AllocKindForLazyBuffer(size_t nbytes)
     {
         JS_ASSERT(nbytes <= INLINE_BUFFER_LIMIT);
         /* For GGC we need at least one slot in which to store a forwarding pointer. */
         size_t dataSlots = Max(size_t(1), AlignBytes(nbytes, sizeof(Value)) / sizeof(Value));
         JS_ASSERT(nbytes <= dataSlots * sizeof(Value));
         return gc::GetGCObjectKind(FIXED_DATA_START + dataSlots);
     }
     static Value bufferValue(TypedArrayObject *tarr) {
         return tarr->getFixedSlot(BUFFER_SLOT);
     }
     static Value byteOffsetValue(TypedArrayObject *tarr) {
         return tarr->getFixedSlot(BYTEOFFSET_SLOT);
     }
     static Value byteLengthValue(TypedArrayObject *tarr) {
         return tarr->getFixedSlot(BYTELENGTH_SLOT);
     }
     static Value lengthValue(TypedArrayObject *tarr) {
         return tarr->getFixedSlot(LENGTH_SLOT);
     }
     static bool
     ensureHasBuffer(JSContext *cx, Handle<TypedArrayObject *> tarray);
     ArrayBufferObject *sharedBuffer() const;
     ArrayBufferObject *buffer() const {
         JSObject *obj = bufferValue(const_cast<TypedArrayObject*>(this)).toObjectOrNull();
         if (!obj)
             return nullptr;
         if (obj->is<ArrayBufferObject>())
             return &obj->as<ArrayBufferObject>();
         return sharedBuffer();
     }
     uint32_t byteOffset() const {
         return byteOffsetValue(const_cast<TypedArrayObject*>(this)).toInt32();
     }
     uint32_t byteLength() const {
         return byteLengthValue(const_cast<TypedArrayObject*>(this)).toInt32();
     }
     uint32_t length() const {
         return lengthValue(const_cast<TypedArrayObject*>(this)).toInt32();
     }
     uint32_t type() const {
         return getFixedSlot(TYPE_SLOT).toInt32();
     }
     void *viewData() const {
         // Keep synced with js::Get<Type>ArrayLengthAndData in jsfriendapi.h!
         return static_cast<void*>(getPrivate(DATA_SLOT));
     }
     Value getElement(uint32_t index);
     static void setElement(TypedArrayObject &obj, uint32_t index, double d);
     void neuter(void *newData);
     static uint32_t slotWidth(int atype) {
         switch (atype) {
           case ScalarTypeDescr::TYPE_INT8:
           case ScalarTypeDescr::TYPE_UINT8:
           case ScalarTypeDescr::TYPE_UINT8_CLAMPED:
             return 1;
           case ScalarTypeDescr::TYPE_INT16:
           case ScalarTypeDescr::TYPE_UINT16:
             return 2;
           case ScalarTypeDescr::TYPE_INT32:
           case ScalarTypeDescr::TYPE_UINT32:
           case ScalarTypeDescr::TYPE_FLOAT32:
             return 4;
           case ScalarTypeDescr::TYPE_FLOAT64:
             return 8;
           default:
             MOZ_ASSUME_UNREACHABLE("invalid typed array type");
         }
     }
     int slotWidth() {
         return slotWidth(type());
     }
     /*
      * Byte length above which created typed arrays and data views will have
      * singleton types regardless of the context in which they are created.
      */
     static const uint32_t SINGLETON_TYPE_BYTE_LENGTH = 1024 * 1024 * 10;
     static int lengthOffset();
     static int dataOffset();
 };
 inline bool
 IsTypedArrayClass(const Class *clasp)
 {
     return &TypedArrayObject::classes[0] <= clasp &&
            clasp < &TypedArrayObject::classes[ScalarTypeDescr::TYPE_MAX];
 }
 inline bool
 IsTypedArrayProtoClass(const Class *clasp)
 {
     return &TypedArrayObject::protoClasses[0] <= clasp &&
            clasp < &TypedArrayObject::protoClasses[ScalarTypeDescr::TYPE_MAX];
 }
 bool
 IsTypedArrayConstructor(HandleValue v, uint32_t type);
 bool
 IsTypedArrayBuffer(HandleValue v);
 ArrayBufferObject &
 AsTypedArrayBuffer(HandleValue v);
 // Return value is whether the string is some integer. If the string is an
 // integer which is not representable as a uint64_t, the return value is true
 // and the resulting index is UINT64_MAX.
 bool
 StringIsTypedArrayIndex(JSLinearString *str, uint64_t *indexp);
 inline bool
 IsTypedArrayIndex(jsid id, uint64_t *indexp)
 {
     if (JSID_IS_INT(id)) {
         int32_t i = JSID_TO_INT(id);
         JS_ASSERT(i >= 0);
         *indexp = (double)i;
         return true;
     }
     if (MOZ_UNLIKELY(!JSID_IS_STRING(id)))
         return false;
     JSAtom *atom = JSID_TO_ATOM(id);
     jschar c = atom->chars()[0];
     if (!JS7_ISDEC(c) && c != '-')
         return false;
     return StringIsTypedArrayIndex(atom, indexp);
 }
 static inline unsigned
 TypedArrayShift(ArrayBufferView::ViewType viewType)
 {
     switch (viewType) {
       case ArrayBufferView::TYPE_INT8:
       case ArrayBufferView::TYPE_UINT8:
       case ArrayBufferView::TYPE_UINT8_CLAMPED:
         return 0;
       case ArrayBufferView::TYPE_INT16:
       case ArrayBufferView::TYPE_UINT16:
         return 1;
       case ArrayBufferView::TYPE_INT32:
       case ArrayBufferView::TYPE_UINT32:
       case ArrayBufferView::TYPE_FLOAT32:
         return 2;
       case ArrayBufferView::TYPE_FLOAT64:
         return 3;
       default:;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected array type");
 }
 class DataViewObject : public ArrayBufferViewObject
 {
     static const size_t RESERVED_SLOTS = JS_DATAVIEW_SLOTS;
     static const size_t DATA_SLOT      = JS_TYPEDOBJ_SLOT_DATA;
   private:
     static const Class protoClass;
     static bool is(HandleValue v) {
         return v.isObject() && v.toObject().hasClass(&class_);
     }
     template <typename NativeType>
     static uint8_t *
     getDataPointer(JSContext *cx, Handle<DataViewObject*> obj, uint32_t offset);
     template<Value ValueGetter(DataViewObject *view)>
     static bool
     getterImpl(JSContext *cx, CallArgs args);
     template<Value ValueGetter(DataViewObject *view)>
     static bool
     getter(JSContext *cx, unsigned argc, Value *vp);
     template<Value ValueGetter(DataViewObject *view)>
     static bool
     defineGetter(JSContext *cx, PropertyName *name, HandleObject proto);
   public:
     static const Class class_;
     static Value byteOffsetValue(DataViewObject *view) {
         Value v = view->getReservedSlot(BYTEOFFSET_SLOT);
         JS_ASSERT(v.toInt32() >= 0);
         return v;
     }
     static Value byteLengthValue(DataViewObject *view) {
         Value v = view->getReservedSlot(BYTELENGTH_SLOT);
         JS_ASSERT(v.toInt32() >= 0);
         return v;
     }
     static Value bufferValue(DataViewObject *view) {
         return view->getReservedSlot(BUFFER_SLOT);
     }
     uint32_t byteOffset() const {
         return byteOffsetValue(const_cast<DataViewObject*>(this)).toInt32();
     }
     uint32_t byteLength() const {
         return byteLengthValue(const_cast<DataViewObject*>(this)).toInt32();
     }
     ArrayBufferObject &arrayBuffer() const {
         return bufferValue(const_cast<DataViewObject*>(this)).toObject().as<ArrayBufferObject>();
     }
     void *dataPointer() const {
         return getPrivate();
     }
     static bool class_constructor(JSContext *cx, unsigned argc, Value *vp);
     static bool constructWithProto(JSContext *cx, unsigned argc, Value *vp);
     static bool construct(JSContext *cx, JSObject *bufobj, const CallArgs &args,
                           HandleObject proto);
     static inline DataViewObject *
     create(JSContext *cx, uint32_t byteOffset, uint32_t byteLength,
            Handle<ArrayBufferObject*> arrayBuffer, JSObject *proto);
     static bool getInt8Impl(JSContext *cx, CallArgs args);
     static bool fun_getInt8(JSContext *cx, unsigned argc, Value *vp);
     static bool getUint8Impl(JSContext *cx, CallArgs args);
     static bool fun_getUint8(JSContext *cx, unsigned argc, Value *vp);
     static bool getInt16Impl(JSContext *cx, CallArgs args);
     static bool fun_getInt16(JSContext *cx, unsigned argc, Value *vp);
     static bool getUint16Impl(JSContext *cx, CallArgs args);
     static bool fun_getUint16(JSContext *cx, unsigned argc, Value *vp);
     static bool getInt32Impl(JSContext *cx, CallArgs args);
     static bool fun_getInt32(JSContext *cx, unsigned argc, Value *vp);
     static bool getUint32Impl(JSContext *cx, CallArgs args);
     static bool fun_getUint32(JSContext *cx, unsigned argc, Value *vp);
     static bool getFloat32Impl(JSContext *cx, CallArgs args);
     static bool fun_getFloat32(JSContext *cx, unsigned argc, Value *vp);
     static bool getFloat64Impl(JSContext *cx, CallArgs args);
     static bool fun_getFloat64(JSContext *cx, unsigned argc, Value *vp);
     static bool setInt8Impl(JSContext *cx, CallArgs args);
     static bool fun_setInt8(JSContext *cx, unsigned argc, Value *vp);
     static bool setUint8Impl(JSContext *cx, CallArgs args);
     static bool fun_setUint8(JSContext *cx, unsigned argc, Value *vp);
     static bool setInt16Impl(JSContext *cx, CallArgs args);
     static bool fun_setInt16(JSContext *cx, unsigned argc, Value *vp);
     static bool setUint16Impl(JSContext *cx, CallArgs args);
     static bool fun_setUint16(JSContext *cx, unsigned argc, Value *vp);
     static bool setInt32Impl(JSContext *cx, CallArgs args);
     static bool fun_setInt32(JSContext *cx, unsigned argc, Value *vp);
     static bool setUint32Impl(JSContext *cx, CallArgs args);
     static bool fun_setUint32(JSContext *cx, unsigned argc, Value *vp);
     static bool setFloat32Impl(JSContext *cx, CallArgs args);
     static bool fun_setFloat32(JSContext *cx, unsigned argc, Value *vp);
     static bool setFloat64Impl(JSContext *cx, CallArgs args);
     static bool fun_setFloat64(JSContext *cx, unsigned argc, Value *vp);
     static bool initClass(JSContext *cx);
     static void neuter(JSObject *view);
     template<typename NativeType>
     static bool read(JSContext *cx, Handle<DataViewObject*> obj,
                      CallArgs &args, NativeType *val, const char *method);
     template<typename NativeType>
     static bool write(JSContext *cx, Handle<DataViewObject*> obj,
                       CallArgs &args, const char *method);
     void neuter(void *newData);
   private:
     static const JSFunctionSpec jsfuncs[];
 };
 static inline int32_t
 ClampIntForUint8Array(int32_t x)
 {
     if (x < 0)
         return 0;
     if (x > 255)
         return 255;
     return x;
 }
 } // namespace js
 template <>
 inline bool
 JSObject::is<js::TypedArrayObject>() const
 {
     return js::IsTypedArrayClass(getClass());
 }
 template <>
 inline bool
 JSObject::is<js::ArrayBufferViewObject>() const
 {
     return is<js::DataViewObject>() || is<js::TypedArrayObject>() ||
            IsTypedObjectClass(getClass());
 }
 #endif /* vm_TypedArrayObject_h */

The Tor Browser / annotate

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

js/src/vm/TypedArrayObject.h