The Tor Browser: comparison js/src/vm/TypedArrayObject.cpp

--1:000000000000
+:83c65ded0074
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+* vim: set ts=8 sts=4 et sw=4 tw=99:
+* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "vm/TypedArrayObject.h"
+#include "mozilla/Alignment.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/PodOperations.h"
+#include <string.h>
+#ifndef XP_WIN
+# include <sys/mman.h>
+#endif
+#include "jsapi.h"
+#include "jsarray.h"
+#include "jscntxt.h"
+#include "jscpucfg.h"
+#include "jsnum.h"
+#include "jsobj.h"
+#include "jstypes.h"
+#include "jsutil.h"
+#ifdef XP_WIN
+# include "jswin.h"
+#endif
+#include "jswrapper.h"
+#include "gc/Barrier.h"
+#include "gc/Marking.h"
+#include "jit/AsmJS.h"
+#include "jit/AsmJSModule.h"
+#include "vm/ArrayBufferObject.h"
+#include "vm/GlobalObject.h"
+#include "vm/Interpreter.h"
+#include "vm/NumericConversions.h"
+#include "vm/SharedArrayObject.h"
+#include "vm/WrapperObject.h"
+#include "jsatominlines.h"
+#include "jsinferinlines.h"
+#include "jsobjinlines.h"
+#include "vm/Shape-inl.h"
+using namespace js;
+using namespace js::gc;
+using namespace js::types;
+using mozilla::IsNaN;
+using mozilla::NegativeInfinity;
+using mozilla::PodCopy;
+using mozilla::PositiveInfinity;
+using JS::CanonicalizeNaN;
+using JS::GenericNaN;
+static bool
+ValueIsLength(const Value &v, uint32_t *len)
+{
+if (v.isInt32()) {
+int32_t i = v.toInt32();
+if (i < 0)
+return false;
+*len = i;
+return true;
+}
+if (v.isDouble()) {
+double d = v.toDouble();
+if (IsNaN(d))
+return false;
+uint32_t length = uint32_t(d);
+if (d != double(length))
+return false;
+*len = length;
+return true;
+}
+return false;
+}
+/*
+* TypedArrayObject
+*
+* The non-templated base class for the specific typed implementations.
+* This class holds all the member variables that are used by
+* the subclasses.
+*/
+void
+TypedArrayObject::neuter(void *newData)
+{
+setSlot(LENGTH_SLOT, Int32Value(0));
+setSlot(BYTELENGTH_SLOT, Int32Value(0));
+setSlot(BYTEOFFSET_SLOT, Int32Value(0));
+setPrivate(newData);
+}
+ArrayBufferObject *
+TypedArrayObject::sharedBuffer() const
+{
+return &bufferValue(const_cast<TypedArrayObject*>(this)).toObject().as<SharedArrayBufferObject>();
+}
+/* static */ bool
+TypedArrayObject::ensureHasBuffer(JSContext *cx, Handle<TypedArrayObject *> tarray)
+{
+if (tarray->buffer())
+return true;
+Rooted<ArrayBufferObject *> buffer(cx, ArrayBufferObject::create(cx, tarray->byteLength()));
+if (!buffer)
+return false;
+buffer->addView(tarray);
+memcpy(buffer->dataPointer(), tarray->viewData(), tarray->byteLength());
+InitArrayBufferViewDataPointer(tarray, buffer, 0);
+tarray->setSlot(BUFFER_SLOT, ObjectValue(*buffer));
+return true;
+}
+/* static */ int
+TypedArrayObject::lengthOffset()
+{
+return JSObject::getFixedSlotOffset(LENGTH_SLOT);
+}
+/* static */ int
+TypedArrayObject::dataOffset()
+{
+return JSObject::getPrivateDataOffset(DATA_SLOT);
+}
+/* Helper clamped uint8_t type */
+uint32_t JS_FASTCALL
+js::ClampDoubleToUint8(const double x)
+{
+// Not < so that NaN coerces to 0
+if (!(x >= 0))
+return 0;
+if (x > 255)
+return 255;
+double toTruncate = x + 0.5;
+uint8_t y = uint8_t(toTruncate);
+/*
+* now val is rounded to nearest, ties rounded up.  We want
+* rounded to nearest ties to even, so check whether we had a
+* tie.
+*/
+if (y == toTruncate) {
+/*
+* It was a tie (since adding 0.5 gave us the exact integer
+* we want).  Since we rounded up, we either already have an
+* even number or we have an odd number but the number we
+* want is one less.  So just unconditionally masking out the
+* ones bit should do the trick to get us the value we
+* want.
+*/
+return y & ~1;
+}
+return y;
+}
+template<typename NativeType> static inline const int TypeIDOfType();
+template<> inline const int TypeIDOfType<int8_t>() { return ScalarTypeDescr::TYPE_INT8; }
+template<> inline const int TypeIDOfType<uint8_t>() { return ScalarTypeDescr::TYPE_UINT8; }
+template<> inline const int TypeIDOfType<int16_t>() { return ScalarTypeDescr::TYPE_INT16; }
+template<> inline const int TypeIDOfType<uint16_t>() { return ScalarTypeDescr::TYPE_UINT16; }
+template<> inline const int TypeIDOfType<int32_t>() { return ScalarTypeDescr::TYPE_INT32; }
+template<> inline const int TypeIDOfType<uint32_t>() { return ScalarTypeDescr::TYPE_UINT32; }
+template<> inline const int TypeIDOfType<float>() { return ScalarTypeDescr::TYPE_FLOAT32; }
+template<> inline const int TypeIDOfType<double>() { return ScalarTypeDescr::TYPE_FLOAT64; }
+template<> inline const int TypeIDOfType<uint8_clamped>() { return ScalarTypeDescr::TYPE_UINT8_CLAMPED; }
+template<typename ElementType>
+static inline JSObject *
+NewArray(JSContext *cx, uint32_t nelements);
+namespace {
+template<typename NativeType>
+class TypedArrayObjectTemplate : public TypedArrayObject
+{
+public:
+typedef NativeType ThisType;
+typedef TypedArrayObjectTemplate<NativeType> ThisTypedArrayObject;
+static const int ArrayTypeID() { return TypeIDOfType<NativeType>(); }
+static const bool ArrayTypeIsUnsigned() { return TypeIsUnsigned<NativeType>(); }
+static const bool ArrayTypeIsFloatingPoint() { return TypeIsFloatingPoint<NativeType>(); }
+static const size_t BYTES_PER_ELEMENT = sizeof(ThisType);
+static inline const Class *protoClass()
+{
+return &TypedArrayObject::protoClasses[ArrayTypeID()];
+}
+static inline const Class *instanceClass()
+{
+return &TypedArrayObject::classes[ArrayTypeID()];
+}
+static bool is(HandleValue v) {
+return v.isObject() && v.toObject().hasClass(instanceClass());
+}
+static void
+setIndexValue(TypedArrayObject &tarray, uint32_t index, double d)
+{
+// If the array is an integer array, we only handle up to
+// 32-bit ints from this point on.  if we want to handle
+// 64-bit ints, we'll need some changes.
+// Assign based on characteristics of the destination type
+if (ArrayTypeIsFloatingPoint()) {
+setIndex(tarray, index, NativeType(d));
+} else if (ArrayTypeIsUnsigned()) {
+JS_ASSERT(sizeof(NativeType) <= 4);
+uint32_t n = ToUint32(d);
+setIndex(tarray, index, NativeType(n));
+} else if (ArrayTypeID() == ScalarTypeDescr::TYPE_UINT8_CLAMPED) {
+// The uint8_clamped type has a special rounding converter
+// for doubles.
+setIndex(tarray, index, NativeType(d));
+} else {
+JS_ASSERT(sizeof(NativeType) <= 4);
+int32_t n = ToInt32(d);
+setIndex(tarray, index, NativeType(n));
+}
+}
+static TypedArrayObject *
+makeProtoInstance(JSContext *cx, HandleObject proto, AllocKind allocKind)
+{
+JS_ASSERT(proto);
+RootedObject obj(cx, NewBuiltinClassInstance(cx, instanceClass(), allocKind));
+if (!obj)
+return nullptr;
+types::TypeObject *type = cx->getNewType(obj->getClass(), proto.get());
+if (!type)
+return nullptr;
+obj->setType(type);
+return &obj->as<TypedArrayObject>();
+}
+static TypedArrayObject *
+makeTypedInstance(JSContext *cx, uint32_t len, AllocKind allocKind)
+{
+if (len * sizeof(NativeType) >= TypedArrayObject::SINGLETON_TYPE_BYTE_LENGTH) {
+return &NewBuiltinClassInstance(cx, instanceClass(), allocKind,
+SingletonObject)->as<TypedArrayObject>();
+}
+jsbytecode *pc;
+RootedScript script(cx, cx->currentScript(&pc));
+NewObjectKind newKind = script
+? UseNewTypeForInitializer(script, pc, instanceClass())
+: GenericObject;
+RootedObject obj(cx, NewBuiltinClassInstance(cx, instanceClass(), allocKind, newKind));
+if (!obj)
+return nullptr;
+if (script) {
+if (!types::SetInitializerObjectType(cx, script, pc, obj, newKind))
+return nullptr;
+}
+return &obj->as<TypedArrayObject>();
+}
+static JSObject *
+makeInstance(JSContext *cx, Handle<ArrayBufferObject *> buffer, uint32_t byteOffset, uint32_t len,
+HandleObject proto)
+{
+JS_ASSERT_IF(!buffer, byteOffset == 0);
+gc::AllocKind allocKind = buffer
+? GetGCObjectKind(instanceClass())
+: AllocKindForLazyBuffer(len * sizeof(NativeType));
+Rooted<TypedArrayObject*> obj(cx);
+if (proto)
+obj = makeProtoInstance(cx, proto, allocKind);
+else
+obj = makeTypedInstance(cx, len, allocKind);
+if (!obj)
+return nullptr;
+obj->setSlot(TYPE_SLOT, Int32Value(ArrayTypeID()));
+obj->setSlot(BUFFER_SLOT, ObjectOrNullValue(buffer));
+if (buffer) {
+InitArrayBufferViewDataPointer(obj, buffer, byteOffset);
+} else {
+void *data = obj->fixedData(FIXED_DATA_START);
+obj->initPrivate(data);
+memset(data, 0, len * sizeof(NativeType));
+}
+obj->setSlot(LENGTH_SLOT, Int32Value(len));
+obj->setSlot(BYTEOFFSET_SLOT, Int32Value(byteOffset));
+obj->setSlot(BYTELENGTH_SLOT, Int32Value(len * sizeof(NativeType)));
+obj->setSlot(NEXT_VIEW_SLOT, PrivateValue(nullptr));
+#ifdef DEBUG
+if (buffer) {
+uint32_t arrayByteLength = obj->byteLength();
+uint32_t arrayByteOffset = obj->byteOffset();
+uint32_t bufferByteLength = buffer->byteLength();
+JS_ASSERT_IF(!buffer->isNeutered(), buffer->dataPointer() <= obj->viewData());
+JS_ASSERT(bufferByteLength - arrayByteOffset >= arrayByteLength);
+JS_ASSERT(arrayByteOffset <= bufferByteLength);
+}
+// Verify that the private slot is at the expected place
+JS_ASSERT(obj->numFixedSlots() == DATA_SLOT);
+#endif
+if (buffer)
+buffer->addView(obj);
+return obj;
+}
+static JSObject *
+makeInstance(JSContext *cx, Handle<ArrayBufferObject *> bufobj, uint32_t byteOffset, uint32_t len)
+{
+RootedObject nullproto(cx, nullptr);
+return makeInstance(cx, bufobj, byteOffset, len, nullproto);
+}
+/*
+* new [Type]Array(length)
+* new [Type]Array(otherTypedArray)
+* new [Type]Array(JSArray)
+* new [Type]Array(ArrayBuffer, [optional] byteOffset, [optional] length)
+*/
+static bool
+class_constructor(JSContext *cx, unsigned argc, Value *vp)
+{
+/* N.B. this is a constructor for protoClass, not instanceClass! */
+CallArgs args = CallArgsFromVp(argc, vp);
+JSObject *obj = create(cx, args);
+if (!obj)
+return false;
+args.rval().setObject(*obj);
+return true;
+}
+static JSObject *
+create(JSContext *cx, const CallArgs& args)
+{
+/* () or (number) */
+uint32_t len = 0;
+if (args.length() == 0 || ValueIsLength(args[0], &len))
+return fromLength(cx, len);
+/* (not an object) */
+if (!args[0].isObject()) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr;
+}
+RootedObject dataObj(cx, &args.get(0).toObject());
+/*
+* (typedArray)
+* (type[] array)
+*
+* Otherwise create a new typed array and copy elements 0..len-1
+* properties from the object, treating it as some sort of array.
+* Note that offset and length will be ignored
+*/
+if (!UncheckedUnwrap(dataObj)->is<ArrayBufferObject>() &&
+!UncheckedUnwrap(dataObj)->is<SharedArrayBufferObject>())
+{
+return fromArray(cx, dataObj);
+}
+/* (ArrayBuffer, [byteOffset, [length]]) */
+int32_t byteOffset = 0;
+int32_t length = -1;
+if (args.length() > 1) {
+if (!ToInt32(cx, args[1], &byteOffset))
+return nullptr;
+if (byteOffset < 0) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_TYPED_ARRAY_NEGATIVE_ARG, "1");
+return nullptr;
+}
+if (args.length() > 2) {
+if (!ToInt32(cx, args[2], &length))
+return nullptr;
+if (length < 0) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_TYPED_ARRAY_NEGATIVE_ARG, "2");
+return nullptr;
+}
+}
+}
+Rooted<JSObject*> proto(cx, nullptr);
+return fromBuffer(cx, dataObj, byteOffset, length, proto);
+}
+static bool IsThisClass(HandleValue v) {
+return v.isObject() && v.toObject().hasClass(instanceClass());
+}
+template<Value ValueGetter(TypedArrayObject *tarr)>
+static bool
+GetterImpl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(IsThisClass(args.thisv()));
+args.rval().set(ValueGetter(&args.thisv().toObject().as<TypedArrayObject>()));
+return true;
+}
+// ValueGetter is a function that takes an unwrapped typed array object and
+// returns a Value. Given such a function, Getter<> is a native that
+// retrieves a given Value, probably from a slot on the object.
+template<Value ValueGetter(TypedArrayObject *tarr)>
+static bool
+Getter(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<ThisTypedArrayObject::IsThisClass,
+ThisTypedArrayObject::GetterImpl<ValueGetter> >(cx, args);
+}
+static bool
+BufferGetterImpl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(IsThisClass(args.thisv()));
+Rooted<TypedArrayObject *> tarray(cx, &args.thisv().toObject().as<TypedArrayObject>());
+if (!ensureHasBuffer(cx, tarray))
+return false;
+args.rval().set(bufferValue(tarray));
+return true;
+}
+// BufferGetter is a function that lazily constructs the array buffer for a
+// typed array before fetching it.
+static bool
+BufferGetter(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<ThisTypedArrayObject::IsThisClass,
+ThisTypedArrayObject::BufferGetterImpl>(cx, args);
+}
+// Define an accessor for a read-only property that invokes a native getter
+static bool
+DefineGetter(JSContext *cx, HandleObject proto, PropertyName *name, Native native)
+{
+RootedId id(cx, NameToId(name));
+unsigned attrs = JSPROP_SHARED | JSPROP_GETTER | JSPROP_PERMANENT;
+Rooted<GlobalObject*> global(cx, cx->compartment()->maybeGlobal());
+JSObject *getter = NewFunction(cx, NullPtr(), native, 0,
+JSFunction::NATIVE_FUN, global, NullPtr());
+if (!getter)
+return false;
+return DefineNativeProperty(cx, proto, id, UndefinedHandleValue,
+JS_DATA_TO_FUNC_PTR(PropertyOp, getter), nullptr,
+attrs);
+}
+static
+bool defineGetters(JSContext *cx, HandleObject proto)
+{
+if (!DefineGetter(cx, proto, cx->names().length, Getter<lengthValue>))
+return false;
+if (!DefineGetter(cx, proto, cx->names().buffer, BufferGetter))
+return false;
+if (!DefineGetter(cx, proto, cx->names().byteLength, Getter<byteLengthValue>))
+return false;
+if (!DefineGetter(cx, proto, cx->names().byteOffset, Getter<byteOffsetValue>))
+return false;
+return true;
+}
+/* subarray(start[, end]) */
+static bool
+fun_subarray_impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(IsThisClass(args.thisv()));
+Rooted<TypedArrayObject*> tarray(cx, &args.thisv().toObject().as<TypedArrayObject>());
+// these are the default values
+uint32_t length = tarray->length();
+uint32_t begin = 0, end = length;
+if (args.length() > 0) {
+if (!ToClampedIndex(cx, args[0], length, &begin))
+return false;
+if (args.length() > 1) {
+if (!ToClampedIndex(cx, args[1], length, &end))
+return false;
+}
+}
+if (begin > end)
+begin = end;
+JSObject *nobj = createSubarray(cx, tarray, begin, end);
+if (!nobj)
+return false;
+args.rval().setObject(*nobj);
+return true;
+}
+static bool
+fun_subarray(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<ThisTypedArrayObject::IsThisClass,
+ThisTypedArrayObject::fun_subarray_impl>(cx, args);
+}
+/* move(begin, end, dest) */
+static bool
+fun_move_impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(IsThisClass(args.thisv()));
+Rooted<TypedArrayObject*> tarray(cx, &args.thisv().toObject().as<TypedArrayObject>());
+if (args.length() < 3) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return false;
+}
+uint32_t srcBegin;
+uint32_t srcEnd;
+uint32_t dest;
+uint32_t originalLength = tarray->length();
+if (!ToClampedIndex(cx, args[0], originalLength, &srcBegin) ||
+!ToClampedIndex(cx, args[1], originalLength, &srcEnd) ||
+!ToClampedIndex(cx, args[2], originalLength, &dest))
+{
+return false;
+}
+if (srcBegin > srcEnd) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_INDEX);
+return false;
+}
+uint32_t lengthDuringMove = tarray->length(); // beware ToClampedIndex
+uint32_t nelts = srcEnd - srcBegin;
+MOZ_ASSERT(dest <= INT32_MAX, "size limited to 2**31");
+MOZ_ASSERT(nelts <= INT32_MAX, "size limited to 2**31");
+if (dest + nelts > lengthDuringMove || srcEnd > lengthDuringMove) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return false;
+}
+uint32_t byteDest = dest * sizeof(NativeType);
+uint32_t byteSrc = srcBegin * sizeof(NativeType);
+uint32_t byteSize = nelts * sizeof(NativeType);
+#ifdef DEBUG
+uint32_t viewByteLength = tarray->byteLength();
+JS_ASSERT(byteDest <= viewByteLength);
+JS_ASSERT(byteSrc <= viewByteLength);
+JS_ASSERT(byteDest + byteSize <= viewByteLength);
+JS_ASSERT(byteSrc + byteSize <= viewByteLength);
+// Should not overflow because size is limited to 2^31
+JS_ASSERT(byteDest + byteSize >= byteDest);
+JS_ASSERT(byteSrc + byteSize >= byteSrc);
+#endif
+uint8_t *data = static_cast<uint8_t*>(tarray->viewData());
+memmove(&data[byteDest], &data[byteSrc], byteSize);
+args.rval().setUndefined();
+return true;
+}
+static bool
+fun_move(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<ThisTypedArrayObject::IsThisClass,
+ThisTypedArrayObject::fun_move_impl>(cx, args);
+}
+/* set(array[, offset]) */
+static bool
+fun_set_impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(IsThisClass(args.thisv()));
+Rooted<TypedArrayObject*> tarray(cx, &args.thisv().toObject().as<TypedArrayObject>());
+// first arg must be either a typed array or a JS array
+if (args.length() == 0 || !args[0].isObject()) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return false;
+}
+int32_t offset = 0;
+if (args.length() > 1) {
+if (!ToInt32(cx, args[1], &offset))
+return false;
+if (offset < 0 || uint32_t(offset) > tarray->length()) {
+// the given offset is bogus
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_TYPED_ARRAY_BAD_INDEX, "2");
+return false;
+}
+}
+if (!args[0].isObject()) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return false;
+}
+RootedObject arg0(cx, args[0].toObjectOrNull());
+if (arg0->is<TypedArrayObject>()) {
+if (arg0->as<TypedArrayObject>().length() > tarray->length() - offset) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_ARRAY_LENGTH);
+return false;
+}
+if (!copyFromTypedArray(cx, tarray, arg0, offset))
+return false;
+} else {
+uint32_t len;
+if (!GetLengthProperty(cx, arg0, &len))
+return false;
+if (uint32_t(offset) > tarray->length() || len > tarray->length() - offset) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_ARRAY_LENGTH);
+return false;
+}
+if (!copyFromArray(cx, tarray, arg0, len, offset))
+return false;
+}
+args.rval().setUndefined();
+return true;
+}
+static bool
+fun_set(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<ThisTypedArrayObject::IsThisClass,
+ThisTypedArrayObject::fun_set_impl>(cx, args);
+}
+public:
+static JSObject *
+fromBuffer(JSContext *cx, HandleObject bufobj, uint32_t byteOffset, int32_t lengthInt,
+HandleObject proto)
+{
+if (!ObjectClassIs(bufobj, ESClass_ArrayBuffer, cx)) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr; // must be arrayBuffer
+}
+JS_ASSERT(IsArrayBuffer(bufobj) || bufobj->is<ProxyObject>());
+if (bufobj->is<ProxyObject>()) {
+/*
+* Normally, NonGenericMethodGuard handles the case of transparent
+* wrappers. However, we have a peculiar situation: we want to
+* construct the new typed array in the compartment of the buffer,
+* so that the typed array can point directly at their buffer's
+* data without crossing compartment boundaries. So we use the
+* machinery underlying NonGenericMethodGuard directly to proxy the
+* native call. We will end up with a wrapper in the origin
+* compartment for a view in the target compartment referencing the
+* ArrayBufferObject in that same compartment.
+*/
+JSObject *wrapped = CheckedUnwrap(bufobj);
+if (!wrapped) {
+JS_ReportError(cx, "Permission denied to access object");
+return nullptr;
+}
+if (IsArrayBuffer(wrapped)) {
+/*
+* And for even more fun, the new view's prototype should be
+* set to the origin compartment's prototype object, not the
+* target's (specifically, the actual view in the target
+* compartment will use as its prototype a wrapper around the
+* origin compartment's view.prototype object).
+*
+* Rather than hack some crazy solution together, implement
+* this all using a private helper function, created when
+* ArrayBufferObject was initialized and cached in the global.
+* This reuses all the existing cross-compartment crazy so we
+* don't have to do anything *uniquely* crazy here.
+*/
+Rooted<JSObject*> proto(cx);
+if (!GetBuiltinPrototype(cx, JSCLASS_CACHED_PROTO_KEY(instanceClass()), &proto))
+return nullptr;
+InvokeArgs args(cx);
+if (!args.init(3))
+return nullptr;
+args.setCallee(cx->compartment()->maybeGlobal()->createArrayFromBuffer<NativeType>());
+args.setThis(ObjectValue(*bufobj));
+args[0].setNumber(byteOffset);
+args[1].setInt32(lengthInt);
+args[2].setObject(*proto);
+if (!Invoke(cx, args))
+return nullptr;
+return &args.rval().toObject();
+}
+}
+if (!IsArrayBuffer(bufobj)) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr; // must be arrayBuffer
+}
+Rooted<ArrayBufferObject *> buffer(cx, &AsArrayBuffer(bufobj));
+if (byteOffset > buffer->byteLength() || byteOffset % sizeof(NativeType) != 0) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr; // invalid byteOffset
+}
+uint32_t len;
+if (lengthInt == -1) {
+len = (buffer->byteLength() - byteOffset) / sizeof(NativeType);
+if (len * sizeof(NativeType) != buffer->byteLength() - byteOffset) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr; // given byte array doesn't map exactly to sizeof(NativeType) * N
+}
+} else {
+len = uint32_t(lengthInt);
+}
+// Go slowly and check for overflow.
+uint32_t arrayByteLength = len * sizeof(NativeType);
+if (len >= INT32_MAX / sizeof(NativeType) || byteOffset >= INT32_MAX - arrayByteLength) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr; // overflow when calculating byteOffset + len * sizeof(NativeType)
+}
+if (arrayByteLength + byteOffset > buffer->byteLength()) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_TYPED_ARRAY_BAD_ARGS);
+return nullptr; // byteOffset + len is too big for the arraybuffer
+}
+return makeInstance(cx, buffer, byteOffset, len, proto);
+}
+static bool
+maybeCreateArrayBuffer(JSContext *cx, uint32_t nelements, MutableHandle<ArrayBufferObject *> buffer)
+{
+// Make sure that array elements evenly divide into the inline buffer's
+// size, for the test below.
+JS_STATIC_ASSERT((INLINE_BUFFER_LIMIT / sizeof(NativeType)) * sizeof(NativeType) == INLINE_BUFFER_LIMIT);
+if (nelements <= INLINE_BUFFER_LIMIT / sizeof(NativeType)) {
+// The array's data can be inline, and the buffer created lazily.
+return true;
+}
+if (nelements >= INT32_MAX / sizeof(NativeType)) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_NEED_DIET, "size and count");
+return false;
+}
+buffer.set(ArrayBufferObject::create(cx, nelements * sizeof(NativeType)));
+return !!buffer;
+}
+static JSObject *
+fromLength(JSContext *cx, uint32_t nelements)
+{
+Rooted<ArrayBufferObject *> buffer(cx);
+if (!maybeCreateArrayBuffer(cx, nelements, &buffer))
+return nullptr;
+return makeInstance(cx, buffer, 0, nelements);
+}
+static JSObject *
+fromArray(JSContext *cx, HandleObject other)
+{
+uint32_t len;
+if (other->is<TypedArrayObject>()) {
+len = other->as<TypedArrayObject>().length();
+} else if (!GetLengthProperty(cx, other, &len)) {
+return nullptr;
+}
+Rooted<ArrayBufferObject *> buffer(cx);
+if (!maybeCreateArrayBuffer(cx, len, &buffer))
+return nullptr;
+RootedObject obj(cx, makeInstance(cx, buffer, 0, len));
+if (!obj || !copyFromArray(cx, obj, other, len))
+return nullptr;
+return obj;
+}
+static const NativeType
+getIndex(JSObject *obj, uint32_t index)
+{
+TypedArrayObject &tarray = obj->as<TypedArrayObject>();
+MOZ_ASSERT(index < tarray.length());
+return static_cast<const NativeType*>(tarray.viewData())[index];
+}
+static void
+setIndex(TypedArrayObject &tarray, uint32_t index, NativeType val)
+{
+MOZ_ASSERT(index < tarray.length());
+static_cast<NativeType*>(tarray.viewData())[index] = val;
+}
+static Value getIndexValue(JSObject *tarray, uint32_t index);
+static JSObject *
+createSubarray(JSContext *cx, HandleObject tarrayArg, uint32_t begin, uint32_t end)
+{
+Rooted<TypedArrayObject*> tarray(cx, &tarrayArg->as<TypedArrayObject>());
+if (begin > tarray->length() || end > tarray->length() || begin > end) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_INDEX);
+return nullptr;
+}
+if (!ensureHasBuffer(cx, tarray))
+return nullptr;
+Rooted<ArrayBufferObject *> bufobj(cx, tarray->buffer());
+JS_ASSERT(bufobj);
+uint32_t length = end - begin;
+JS_ASSERT(begin < UINT32_MAX / sizeof(NativeType));
+uint32_t arrayByteOffset = tarray->byteOffset();
+JS_ASSERT(UINT32_MAX - begin * sizeof(NativeType) >= arrayByteOffset);
+uint32_t byteOffset = arrayByteOffset + begin * sizeof(NativeType);
+return makeInstance(cx, bufobj, byteOffset, length);
+}
+protected:
+static NativeType
+doubleToNative(double d)
+{
+if (TypeIsFloatingPoint<NativeType>()) {
+#ifdef JS_MORE_DETERMINISTIC
+// The JS spec doesn't distinguish among different NaN values, and
+// it deliberately doesn't specify the bit pattern written to a
+// typed array when NaN is written into it.  This bit-pattern
+// inconsistency could confuse deterministic testing, so always
+// canonicalize NaN values in more-deterministic builds.
+d = CanonicalizeNaN(d);
+#endif
+return NativeType(d);
+}
+if (MOZ_UNLIKELY(IsNaN(d)))
+return NativeType(0);
+if (TypeIsUnsigned<NativeType>())
+return NativeType(ToUint32(d));
+return NativeType(ToInt32(d));
+}
+static bool
+canConvertInfallibly(const Value &v)
+{
+return v.isNumber() || v.isBoolean() || v.isNull() || v.isUndefined();
+}
+static NativeType
+infallibleValueToNative(const Value &v)
+{
+if (v.isInt32())
+return v.toInt32();
+if (v.isDouble())
+return doubleToNative(v.toDouble());
+if (v.isBoolean())
+return v.toBoolean();
+if (v.isNull())
+return 0;
+MOZ_ASSERT(v.isUndefined());
+return ArrayTypeIsFloatingPoint() ? NativeType(GenericNaN()) : NativeType(0);
+}
+static bool
+valueToNative(JSContext *cx, const Value &v, NativeType *result)
+{
+MOZ_ASSERT(!v.isMagic());
+if (MOZ_LIKELY(canConvertInfallibly(v))) {
+*result = infallibleValueToNative(v);
+return true;
+}
+double d;
+MOZ_ASSERT(v.isString() || v.isObject());
+if (!(v.isString() ? StringToNumber(cx, v.toString(), &d) : ToNumber(cx, v, &d)))
+return false;
+*result = doubleToNative(d);
+return true;
+}
+static bool
+copyFromArray(JSContext *cx, HandleObject thisTypedArrayObj,
+HandleObject source, uint32_t len, uint32_t offset = 0)
+{
+Rooted<TypedArrayObject*> thisTypedArray(cx, &thisTypedArrayObj->as<TypedArrayObject>());
+JS_ASSERT(offset <= thisTypedArray->length());
+JS_ASSERT(len <= thisTypedArray->length() - offset);
+if (source->is<TypedArrayObject>())
+return copyFromTypedArray(cx, thisTypedArray, source, offset);
+uint32_t i = 0;
+if (source->isNative()) {
+// Attempt fast-path infallible conversion of dense elements up to
+// the first potentially side-effectful lookup or conversion.
+uint32_t bound = Min(source->getDenseInitializedLength(), len);
+NativeType *dest = static_cast<NativeType*>(thisTypedArray->viewData()) + offset;
+const Value *srcValues = source->getDenseElements();
+for (; i < bound; i++) {
+// Note: holes don't convert infallibly.
+if (!canConvertInfallibly(srcValues[i]))
+break;
+dest[i] = infallibleValueToNative(srcValues[i]);
+}
+if (i == len)
+return true;
+}
+// Convert and copy any remaining elements generically.
+RootedValue v(cx);
+for (; i < len; i++) {
+if (!JSObject::getElement(cx, source, source, i, &v))
+return false;
+NativeType n;
+if (!valueToNative(cx, v, &n))
+return false;
+len = Min(len, thisTypedArray->length());
+if (i >= len)
+break;
+// Compute every iteration in case getElement acts wacky.
+void *data = thisTypedArray->viewData();
+static_cast<NativeType*>(data)[offset + i] = n;
+}
+return true;
+}
+static bool
+copyFromTypedArray(JSContext *cx, JSObject *thisTypedArrayObj, JSObject *tarrayObj,
+uint32_t offset)
+{
+TypedArrayObject *thisTypedArray = &thisTypedArrayObj->as<TypedArrayObject>();
+TypedArrayObject *tarray = &tarrayObj->as<TypedArrayObject>();
+JS_ASSERT(offset <= thisTypedArray->length());
+JS_ASSERT(tarray->length() <= thisTypedArray->length() - offset);
+if (tarray->buffer() == thisTypedArray->buffer())
+return copyFromWithOverlap(cx, thisTypedArray, tarray, offset);
+NativeType *dest = static_cast<NativeType*>(thisTypedArray->viewData()) + offset;
+if (tarray->type() == thisTypedArray->type()) {
+js_memcpy(dest, tarray->viewData(), tarray->byteLength());
+return true;
+}
+unsigned srclen = tarray->length();
+switch (tarray->type()) {
+case ScalarTypeDescr::TYPE_INT8: {
+int8_t *src = static_cast<int8_t*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_UINT8:
+case ScalarTypeDescr::TYPE_UINT8_CLAMPED: {
+uint8_t *src = static_cast<uint8_t*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_INT16: {
+int16_t *src = static_cast<int16_t*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_UINT16: {
+uint16_t *src = static_cast<uint16_t*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_INT32: {
+int32_t *src = static_cast<int32_t*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_UINT32: {
+uint32_t *src = static_cast<uint32_t*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_FLOAT32: {
+float *src = static_cast<float*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_FLOAT64: {
+double *src = static_cast<double*>(tarray->viewData());
+for (unsigned i = 0; i < srclen; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+default:
+MOZ_ASSUME_UNREACHABLE("copyFrom with a TypedArrayObject of unknown type");
+}
+return true;
+}
+static bool
+copyFromWithOverlap(JSContext *cx, JSObject *selfObj, JSObject *tarrayObj, uint32_t offset)
+{
+TypedArrayObject *self = &selfObj->as<TypedArrayObject>();
+TypedArrayObject *tarray = &tarrayObj->as<TypedArrayObject>();
+JS_ASSERT(offset <= self->length());
+NativeType *dest = static_cast<NativeType*>(self->viewData()) + offset;
+uint32_t byteLength = tarray->byteLength();
+if (tarray->type() == self->type()) {
+memmove(dest, tarray->viewData(), byteLength);
+return true;
+}
+// We have to make a copy of the source array here, since
+// there's overlap, and we have to convert types.
+void *srcbuf = cx->malloc_(byteLength);
+if (!srcbuf)
+return false;
+js_memcpy(srcbuf, tarray->viewData(), byteLength);
+uint32_t len = tarray->length();
+switch (tarray->type()) {
+case ScalarTypeDescr::TYPE_INT8: {
+int8_t *src = (int8_t*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_UINT8:
+case ScalarTypeDescr::TYPE_UINT8_CLAMPED: {
+uint8_t *src = (uint8_t*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_INT16: {
+int16_t *src = (int16_t*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_UINT16: {
+uint16_t *src = (uint16_t*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_INT32: {
+int32_t *src = (int32_t*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_UINT32: {
+uint32_t *src = (uint32_t*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_FLOAT32: {
+float *src = (float*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+case ScalarTypeDescr::TYPE_FLOAT64: {
+double *src = (double*) srcbuf;
+for (unsigned i = 0; i < len; ++i)
+*dest++ = NativeType(*src++);
+break;
+}
+default:
+MOZ_ASSUME_UNREACHABLE("copyFromWithOverlap with a TypedArrayObject of unknown type");
+}
+js_free(srcbuf);
+return true;
+}
+};
+class Int8ArrayObject : public TypedArrayObjectTemplate<int8_t> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_INT8 };
+static const JSProtoKey key = JSProto_Int8Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Uint8ArrayObject : public TypedArrayObjectTemplate<uint8_t> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_UINT8 };
+static const JSProtoKey key = JSProto_Uint8Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Int16ArrayObject : public TypedArrayObjectTemplate<int16_t> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_INT16 };
+static const JSProtoKey key = JSProto_Int16Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Uint16ArrayObject : public TypedArrayObjectTemplate<uint16_t> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_UINT16 };
+static const JSProtoKey key = JSProto_Uint16Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Int32ArrayObject : public TypedArrayObjectTemplate<int32_t> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_INT32 };
+static const JSProtoKey key = JSProto_Int32Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Uint32ArrayObject : public TypedArrayObjectTemplate<uint32_t> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_UINT32 };
+static const JSProtoKey key = JSProto_Uint32Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Float32ArrayObject : public TypedArrayObjectTemplate<float> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_FLOAT32 };
+static const JSProtoKey key = JSProto_Float32Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Float64ArrayObject : public TypedArrayObjectTemplate<double> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_FLOAT64 };
+static const JSProtoKey key = JSProto_Float64Array;
+static const JSFunctionSpec jsfuncs[];
+};
+class Uint8ClampedArrayObject : public TypedArrayObjectTemplate<uint8_clamped> {
+public:
+enum { ACTUAL_TYPE = ScalarTypeDescr::TYPE_UINT8_CLAMPED };
+static const JSProtoKey key = JSProto_Uint8ClampedArray;
+static const JSFunctionSpec jsfuncs[];
+};
+} /* anonymous namespace */
+template<typename T>
+bool
+ArrayBufferObject::createTypedArrayFromBufferImpl(JSContext *cx, CallArgs args)
+{
+typedef TypedArrayObjectTemplate<T> ArrayType;
+JS_ASSERT(IsArrayBuffer(args.thisv()));
+JS_ASSERT(args.length() == 3);
+Rooted<JSObject*> buffer(cx, &args.thisv().toObject());
+Rooted<JSObject*> proto(cx, &args[2].toObject());
+Rooted<JSObject*> obj(cx);
+double byteOffset = args[0].toNumber();
+MOZ_ASSERT(0 <= byteOffset);
+MOZ_ASSERT(byteOffset <= UINT32_MAX);
+MOZ_ASSERT(byteOffset == uint32_t(byteOffset));
+obj = ArrayType::fromBuffer(cx, buffer, uint32_t(byteOffset), args[1].toInt32(), proto);
+if (!obj)
+return false;
+args.rval().setObject(*obj);
+return true;
+}
+template<typename T>
+bool
+ArrayBufferObject::createTypedArrayFromBuffer(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<IsArrayBuffer, createTypedArrayFromBufferImpl<T> >(cx, args);
+}
+// this default implementation is only valid for integer types
+// less than 32-bits in size.
+template<typename NativeType>
+Value
+TypedArrayObjectTemplate<NativeType>::getIndexValue(JSObject *tarray, uint32_t index)
+{
+JS_STATIC_ASSERT(sizeof(NativeType) < 4);
+return Int32Value(getIndex(tarray, index));
+}
+namespace {
+// and we need to specialize for 32-bit integers and floats
+template<>
+Value
+TypedArrayObjectTemplate<int32_t>::getIndexValue(JSObject *tarray, uint32_t index)
+{
+return Int32Value(getIndex(tarray, index));
+}
+template<>
+Value
+TypedArrayObjectTemplate<uint32_t>::getIndexValue(JSObject *tarray, uint32_t index)
+{
+uint32_t val = getIndex(tarray, index);
+return NumberValue(val);
+}
+template<>
+Value
+TypedArrayObjectTemplate<float>::getIndexValue(JSObject *tarray, uint32_t index)
+{
+float val = getIndex(tarray, index);
+double dval = val;
+/*
+* Doubles in typed arrays could be typed-punned arrays of integers. This
+* could allow user code to break the engine-wide invariant that only
+* canonical nans are stored into jsvals, which means user code could
+* confuse the engine into interpreting a double-typed jsval as an
+* object-typed jsval.
+*
+* This could be removed for platforms/compilers known to convert a 32-bit
+* non-canonical nan to a 64-bit canonical nan.
+*/
+return DoubleValue(CanonicalizeNaN(dval));
+}
+template<>
+Value
+TypedArrayObjectTemplate<double>::getIndexValue(JSObject *tarray, uint32_t index)
+{
+double val = getIndex(tarray, index);
+/*
+* Doubles in typed arrays could be typed-punned arrays of integers. This
+* could allow user code to break the engine-wide invariant that only
+* canonical nans are stored into jsvals, which means user code could
+* confuse the engine into interpreting a double-typed jsval as an
+* object-typed jsval.
+*/
+return DoubleValue(CanonicalizeNaN(val));
+}
+} /* anonymous namespace */
+static NewObjectKind
+DataViewNewObjectKind(JSContext *cx, uint32_t byteLength, JSObject *proto)
+{
+if (!proto && byteLength >= TypedArrayObject::SINGLETON_TYPE_BYTE_LENGTH)
+return SingletonObject;
+jsbytecode *pc;
+JSScript *script = cx->currentScript(&pc);
+if (!script)
+return GenericObject;
+return types::UseNewTypeForInitializer(script, pc, &DataViewObject::class_);
+}
+inline DataViewObject *
+DataViewObject::create(JSContext *cx, uint32_t byteOffset, uint32_t byteLength,
+Handle<ArrayBufferObject*> arrayBuffer, JSObject *protoArg)
+{
+JS_ASSERT(byteOffset <= INT32_MAX);
+JS_ASSERT(byteLength <= INT32_MAX);
+RootedObject proto(cx, protoArg);
+RootedObject obj(cx);
+// This is overflow-safe: 2 * INT32_MAX is still a valid uint32_t.
+if (byteOffset + byteLength > arrayBuffer->byteLength()) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_ARG_INDEX_OUT_OF_RANGE, "1");
+return nullptr;
+}
+NewObjectKind newKind = DataViewNewObjectKind(cx, byteLength, proto);
+obj = NewBuiltinClassInstance(cx, &class_, newKind);
+if (!obj)
+return nullptr;
+if (proto) {
+types::TypeObject *type = cx->getNewType(&class_, TaggedProto(proto));
+if (!type)
+return nullptr;
+obj->setType(type);
+} else if (byteLength >= TypedArrayObject::SINGLETON_TYPE_BYTE_LENGTH) {
+JS_ASSERT(obj->hasSingletonType());
+} else {
+jsbytecode *pc;
+RootedScript script(cx, cx->currentScript(&pc));
+if (script) {
+if (!types::SetInitializerObjectType(cx, script, pc, obj, newKind))
+return nullptr;
+}
+}
+DataViewObject &dvobj = obj->as<DataViewObject>();
+dvobj.setFixedSlot(BYTEOFFSET_SLOT, Int32Value(byteOffset));
+dvobj.setFixedSlot(BYTELENGTH_SLOT, Int32Value(byteLength));
+dvobj.setFixedSlot(BUFFER_SLOT, ObjectValue(*arrayBuffer));
+dvobj.setFixedSlot(NEXT_VIEW_SLOT, PrivateValue(nullptr));
+InitArrayBufferViewDataPointer(&dvobj, arrayBuffer, byteOffset);
+JS_ASSERT(byteOffset + byteLength <= arrayBuffer->byteLength());
+// Verify that the private slot is at the expected place
+JS_ASSERT(dvobj.numFixedSlots() == DATA_SLOT);
+arrayBuffer->addView(&dvobj);
+return &dvobj;
+}
+bool
+DataViewObject::construct(JSContext *cx, JSObject *bufobj, const CallArgs &args, HandleObject proto)
+{
+if (!IsArrayBuffer(bufobj)) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
+"DataView", "ArrayBuffer", bufobj->getClass()->name);
+return false;
+}
+Rooted<ArrayBufferObject*> buffer(cx, &AsArrayBuffer(bufobj));
+uint32_t bufferLength = buffer->byteLength();
+uint32_t byteOffset = 0;
+uint32_t byteLength = bufferLength;
+if (args.length() > 1) {
+if (!ToUint32(cx, args[1], &byteOffset))
+return false;
+if (byteOffset > INT32_MAX) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_ARG_INDEX_OUT_OF_RANGE, "1");
+return false;
+}
+if (args.length() > 2) {
+if (!ToUint32(cx, args[2], &byteLength))
+return false;
+if (byteLength > INT32_MAX) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_ARG_INDEX_OUT_OF_RANGE, "2");
+return false;
+}
+} else {
+if (byteOffset > bufferLength) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_ARG_INDEX_OUT_OF_RANGE, "1");
+return false;
+}
+byteLength = bufferLength - byteOffset;
+}
+}
+/* The sum of these cannot overflow a uint32_t */
+JS_ASSERT(byteOffset <= INT32_MAX);
+JS_ASSERT(byteLength <= INT32_MAX);
+if (byteOffset + byteLength > bufferLength) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_ARG_INDEX_OUT_OF_RANGE, "1");
+return false;
+}
+JSObject *obj = DataViewObject::create(cx, byteOffset, byteLength, buffer, proto);
+if (!obj)
+return false;
+args.rval().setObject(*obj);
+return true;
+}
+bool
+DataViewObject::class_constructor(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+RootedObject bufobj(cx);
+if (!GetFirstArgumentAsObject(cx, args, "DataView constructor", &bufobj))
+return false;
+if (bufobj->is<WrapperObject>() && IsArrayBuffer(UncheckedUnwrap(bufobj))) {
+Rooted<GlobalObject*> global(cx, cx->compartment()->maybeGlobal());
+Rooted<JSObject*> proto(cx, global->getOrCreateDataViewPrototype(cx));
+if (!proto)
+return false;
+InvokeArgs args2(cx);
+if (!args2.init(args.length() + 1))
+return false;
+args2.setCallee(global->createDataViewForThis());
+args2.setThis(ObjectValue(*bufobj));
+PodCopy(args2.array(), args.array(), args.length());
+args2[args.length()].setObject(*proto);
+if (!Invoke(cx, args2))
+return false;
+args.rval().set(args2.rval());
+return true;
+}
+return construct(cx, bufobj, args, NullPtr());
+}
+template <typename NativeType>
+/* static */ uint8_t *
+DataViewObject::getDataPointer(JSContext *cx, Handle<DataViewObject*> obj, uint32_t offset)
+{
+const size_t TypeSize = sizeof(NativeType);
+if (offset > UINT32_MAX - TypeSize || offset + TypeSize > obj->byteLength()) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_ARG_INDEX_OUT_OF_RANGE, "1");
+return nullptr;
+}
+return static_cast<uint8_t*>(obj->dataPointer()) + offset;
+}
+static inline bool
+needToSwapBytes(bool littleEndian)
+{
+#if IS_LITTLE_ENDIAN
+return !littleEndian;
+#else
+return littleEndian;
+#endif
+}
+static inline uint8_t
+swapBytes(uint8_t x)
+{
+return x;
+}
+static inline uint16_t
+swapBytes(uint16_t x)
+{
+return ((x & 0xff) << 8) | (x >> 8);
+}
+static inline uint32_t
+swapBytes(uint32_t x)
+{
+return ((x & 0xff) << 24) |
+((x & 0xff00) << 8) |
+((x & 0xff0000) >> 8) |
+((x & 0xff000000) >> 24);
+}
+static inline uint64_t
+swapBytes(uint64_t x)
+{
+uint32_t a = x & UINT32_MAX;
+uint32_t b = x >> 32;
+return (uint64_t(swapBytes(a)) << 32) | swapBytes(b);
+}
+template <typename DataType> struct DataToRepType { typedef DataType result; };
+template <> struct DataToRepType<int8_t>   { typedef uint8_t result; };
+template <> struct DataToRepType<uint8_t>  { typedef uint8_t result; };
+template <> struct DataToRepType<int16_t>  { typedef uint16_t result; };
+template <> struct DataToRepType<uint16_t> { typedef uint16_t result; };
+template <> struct DataToRepType<int32_t>  { typedef uint32_t result; };
+template <> struct DataToRepType<uint32_t> { typedef uint32_t result; };
+template <> struct DataToRepType<float>    { typedef uint32_t result; };
+template <> struct DataToRepType<double>   { typedef uint64_t result; };
+template <typename DataType>
+struct DataViewIO
+{
+typedef typename DataToRepType<DataType>::result ReadWriteType;
+static void fromBuffer(DataType *dest, const uint8_t *unalignedBuffer, bool wantSwap)
+{
+JS_ASSERT((reinterpret_cast<uintptr_t>(dest) & (Min<size_t>(MOZ_ALIGNOF(void*), sizeof(DataType)) - 1)) == 0);
+memcpy((void *) dest, unalignedBuffer, sizeof(ReadWriteType));
+if (wantSwap) {
+ReadWriteType *rwDest = reinterpret_cast<ReadWriteType *>(dest);
+*rwDest = swapBytes(*rwDest);
+}
+}
+static void toBuffer(uint8_t *unalignedBuffer, const DataType *src, bool wantSwap)
+{
+JS_ASSERT((reinterpret_cast<uintptr_t>(src) & (Min<size_t>(MOZ_ALIGNOF(void*), sizeof(DataType)) - 1)) == 0);
+ReadWriteType temp = *reinterpret_cast<const ReadWriteType *>(src);
+if (wantSwap)
+temp = swapBytes(temp);
+memcpy(unalignedBuffer, (void *) &temp, sizeof(ReadWriteType));
+}
+};
+template<typename NativeType>
+/* static */ bool
+DataViewObject::read(JSContext *cx, Handle<DataViewObject*> obj,
+CallArgs &args, NativeType *val, const char *method)
+{
+if (args.length() < 1) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_MORE_ARGS_NEEDED, method, "0", "s");
+return false;
+}
+uint32_t offset;
+if (!ToUint32(cx, args[0], &offset))
+return false;
+bool fromLittleEndian = args.length() >= 2 && ToBoolean(args[1]);
+uint8_t *data = DataViewObject::getDataPointer<NativeType>(cx, obj, offset);
+if (!data)
+return false;
+DataViewIO<NativeType>::fromBuffer(val, data, needToSwapBytes(fromLittleEndian));
+return true;
+}
+template <typename NativeType>
+static inline bool
+WebIDLCast(JSContext *cx, HandleValue value, NativeType *out)
+{
+int32_t temp;
+if (!ToInt32(cx, value, &temp))
+return false;
+// Technically, the behavior of assigning an out of range value to a signed
+// variable is undefined. In practice, compilers seem to do what we want
+// without issuing any warnings.
+*out = static_cast<NativeType>(temp);
+return true;
+}
+template <>
+inline bool
+WebIDLCast<float>(JSContext *cx, HandleValue value, float *out)
+{
+double temp;
+if (!ToNumber(cx, value, &temp))
+return false;
+*out = static_cast<float>(temp);
+return true;
+}
+template <>
+inline bool
+WebIDLCast<double>(JSContext *cx, HandleValue value, double *out)
+{
+return ToNumber(cx, value, out);
+}
+template<typename NativeType>
+/* static */ bool
+DataViewObject::write(JSContext *cx, Handle<DataViewObject*> obj,
+CallArgs &args, const char *method)
+{
+if (args.length() < 2) {
+JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
+JSMSG_MORE_ARGS_NEEDED, method, "1", "");
+return false;
+}
+uint32_t offset;
+if (!ToUint32(cx, args[0], &offset))
+return false;
+NativeType value;
+if (!WebIDLCast(cx, args[1], &value))
+return false;
+bool toLittleEndian = args.length() >= 3 && ToBoolean(args[2]);
+uint8_t *data = DataViewObject::getDataPointer<NativeType>(cx, obj, offset);
+if (!data)
+return false;
+DataViewIO<NativeType>::toBuffer(data, &value, needToSwapBytes(toLittleEndian));
+return true;
+}
+bool
+DataViewObject::getInt8Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+int8_t val;
+if (!read(cx, thisView, args, &val, "getInt8"))
+return false;
+args.rval().setInt32(val);
+return true;
+}
+bool
+DataViewObject::fun_getInt8(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getInt8Impl>(cx, args);
+}
+bool
+DataViewObject::getUint8Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+uint8_t val;
+if (!read(cx, thisView, args, &val, "getUint8"))
+return false;
+args.rval().setInt32(val);
+return true;
+}
+bool
+DataViewObject::fun_getUint8(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getUint8Impl>(cx, args);
+}
+bool
+DataViewObject::getInt16Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+int16_t val;
+if (!read(cx, thisView, args, &val, "getInt16"))
+return false;
+args.rval().setInt32(val);
+return true;
+}
+bool
+DataViewObject::fun_getInt16(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getInt16Impl>(cx, args);
+}
+bool
+DataViewObject::getUint16Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+uint16_t val;
+if (!read(cx, thisView, args, &val, "getUint16"))
+return false;
+args.rval().setInt32(val);
+return true;
+}
+bool
+DataViewObject::fun_getUint16(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getUint16Impl>(cx, args);
+}
+bool
+DataViewObject::getInt32Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+int32_t val;
+if (!read(cx, thisView, args, &val, "getInt32"))
+return false;
+args.rval().setInt32(val);
+return true;
+}
+bool
+DataViewObject::fun_getInt32(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getInt32Impl>(cx, args);
+}
+bool
+DataViewObject::getUint32Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+uint32_t val;
+if (!read(cx, thisView, args, &val, "getUint32"))
+return false;
+args.rval().setNumber(val);
+return true;
+}
+bool
+DataViewObject::fun_getUint32(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getUint32Impl>(cx, args);
+}
+bool
+DataViewObject::getFloat32Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+float val;
+if (!read(cx, thisView, args, &val, "getFloat32"))
+return false;
+args.rval().setDouble(CanonicalizeNaN(val));
+return true;
+}
+bool
+DataViewObject::fun_getFloat32(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getFloat32Impl>(cx, args);
+}
+bool
+DataViewObject::getFloat64Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+double val;
+if (!read(cx, thisView, args, &val, "getFloat64"))
+return false;
+args.rval().setDouble(CanonicalizeNaN(val));
+return true;
+}
+bool
+DataViewObject::fun_getFloat64(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getFloat64Impl>(cx, args);
+}
+bool
+DataViewObject::setInt8Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<int8_t>(cx, thisView, args, "setInt8"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setInt8(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setInt8Impl>(cx, args);
+}
+bool
+DataViewObject::setUint8Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<uint8_t>(cx, thisView, args, "setUint8"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setUint8(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setUint8Impl>(cx, args);
+}
+bool
+DataViewObject::setInt16Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<int16_t>(cx, thisView, args, "setInt16"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setInt16(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setInt16Impl>(cx, args);
+}
+bool
+DataViewObject::setUint16Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<uint16_t>(cx, thisView, args, "setUint16"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setUint16(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setUint16Impl>(cx, args);
+}
+bool
+DataViewObject::setInt32Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<int32_t>(cx, thisView, args, "setInt32"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setInt32(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setInt32Impl>(cx, args);
+}
+bool
+DataViewObject::setUint32Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<uint32_t>(cx, thisView, args, "setUint32"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setUint32(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setUint32Impl>(cx, args);
+}
+bool
+DataViewObject::setFloat32Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<float>(cx, thisView, args, "setFloat32"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setFloat32(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setFloat32Impl>(cx, args);
+}
+bool
+DataViewObject::setFloat64Impl(JSContext *cx, CallArgs args)
+{
+JS_ASSERT(is(args.thisv()));
+Rooted<DataViewObject*> thisView(cx, &args.thisv().toObject().as<DataViewObject>());
+if (!write<double>(cx, thisView, args, "setFloat64"))
+return false;
+args.rval().setUndefined();
+return true;
+}
+bool
+DataViewObject::fun_setFloat64(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, setFloat64Impl>(cx, args);
+}
+Value
+TypedArrayObject::getElement(uint32_t index)
+{
+switch (type()) {
+case ScalarTypeDescr::TYPE_INT8:
+return TypedArrayObjectTemplate<int8_t>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_UINT8:
+return TypedArrayObjectTemplate<uint8_t>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_UINT8_CLAMPED:
+return TypedArrayObjectTemplate<uint8_clamped>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_INT16:
+return TypedArrayObjectTemplate<int16_t>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_UINT16:
+return TypedArrayObjectTemplate<uint16_t>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_INT32:
+return TypedArrayObjectTemplate<int32_t>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_UINT32:
+return TypedArrayObjectTemplate<uint32_t>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_FLOAT32:
+return TypedArrayObjectTemplate<float>::getIndexValue(this, index);
+break;
+case ScalarTypeDescr::TYPE_FLOAT64:
+return TypedArrayObjectTemplate<double>::getIndexValue(this, index);
+break;
+default:
+MOZ_ASSUME_UNREACHABLE("Unknown TypedArray type");
+break;
+}
+}
+void
+TypedArrayObject::setElement(TypedArrayObject &obj, uint32_t index, double d)
+{
+MOZ_ASSERT(index < obj.length());
+switch (obj.type()) {
+case ScalarTypeDescr::TYPE_INT8:
+TypedArrayObjectTemplate<int8_t>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_UINT8:
+TypedArrayObjectTemplate<uint8_t>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_UINT8_CLAMPED:
+TypedArrayObjectTemplate<uint8_clamped>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_INT16:
+TypedArrayObjectTemplate<int16_t>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_UINT16:
+TypedArrayObjectTemplate<uint16_t>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_INT32:
+TypedArrayObjectTemplate<int32_t>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_UINT32:
+TypedArrayObjectTemplate<uint32_t>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_FLOAT32:
+TypedArrayObjectTemplate<float>::setIndexValue(obj, index, d);
+break;
+case ScalarTypeDescr::TYPE_FLOAT64:
+TypedArrayObjectTemplate<double>::setIndexValue(obj, index, d);
+break;
+default:
+MOZ_ASSUME_UNREACHABLE("Unknown TypedArray type");
+break;
+}
+}
+/***
+*** JS impl
+***/
+/*
+* TypedArrayObject boilerplate
+*/
+#ifndef RELEASE_BUILD
+# define IMPL_TYPED_ARRAY_STATICS(_typedArray)                                     \
+const JSFunctionSpec _typedArray##Object::jsfuncs[] = {                            \
+JS_SELF_HOSTED_FN("@@iterator", "ArrayValues", 0, 0),                          \
+JS_FN("subarray", _typedArray##Object::fun_subarray, 2, JSFUN_GENERIC_NATIVE), \
+JS_FN("set", _typedArray##Object::fun_set, 2, JSFUN_GENERIC_NATIVE),           \
+JS_FN("move", _typedArray##Object::fun_move, 3, JSFUN_GENERIC_NATIVE),         \
+JS_FS_END                                                                      \
+}
+#else
+# define IMPL_TYPED_ARRAY_STATICS(_typedArray)                                     \
+const JSFunctionSpec _typedArray##Object::jsfuncs[] = {                            \
+JS_SELF_HOSTED_FN("@@iterator", "ArrayValues", 0, 0),                          \
+JS_FN("subarray", _typedArray##Object::fun_subarray, 2, JSFUN_GENERIC_NATIVE), \
+JS_FN("set", _typedArray##Object::fun_set, 2, JSFUN_GENERIC_NATIVE),           \
+JS_FS_END                                                                      \
+}
+#endif
+#define IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Name,NativeType)                                    \
+JS_FRIEND_API(JSObject *) JS_New ## Name ## Array(JSContext *cx, uint32_t nelements)          \
+{                                                                                             \
+return TypedArrayObjectTemplate<NativeType>::fromLength(cx, nelements);                   \
+}                                                                                             \
+JS_FRIEND_API(JSObject *) JS_New ## Name ## ArrayFromArray(JSContext *cx, HandleObject other) \
+{                                                                                             \
+return TypedArrayObjectTemplate<NativeType>::fromArray(cx, other);                        \
+}                                                                                             \
+JS_FRIEND_API(JSObject *) JS_New ## Name ## ArrayWithBuffer(JSContext *cx,                    \
+HandleObject arrayBuffer, uint32_t byteOffset, int32_t length)   \
+{                                                                                             \
+return TypedArrayObjectTemplate<NativeType>::fromBuffer(cx, arrayBuffer, byteOffset,      \
+length, js::NullPtr());           \
+}                                                                                             \
+JS_FRIEND_API(bool) JS_Is ## Name ## Array(JSObject *obj)                                     \
+{                                                                                             \
+if (!(obj = CheckedUnwrap(obj)))                                                          \
+return false;                                                                         \
+const Class *clasp = obj->getClass();                                                     \
+return clasp == &TypedArrayObject::classes[TypedArrayObjectTemplate<NativeType>::ArrayTypeID()]; \
+} \
+JS_FRIEND_API(JSObject *) js::Unwrap ## Name ## Array(JSObject *obj)                          \
+{                                                                                             \
+obj = CheckedUnwrap(obj);                                                                 \
+if (!obj)                                                                                 \
+return nullptr;                                                                       \
+const Class *clasp = obj->getClass();                                                     \
+if (clasp == &TypedArrayObject::classes[TypedArrayObjectTemplate<NativeType>::ArrayTypeID()]) \
+return obj;                                                                           \
+return nullptr;                                                                           \
+} \
+const js::Class* const js::detail::Name ## ArrayClassPtr =                                    \
+&js::TypedArrayObject::classes[TypedArrayObjectTemplate<NativeType>::ArrayTypeID()];
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Int8, int8_t)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Uint8, uint8_t)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Uint8Clamped, uint8_clamped)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Int16, int16_t)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Uint16, uint16_t)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Int32, int32_t)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Uint32, uint32_t)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Float32, float)
+IMPL_TYPED_ARRAY_JSAPI_CONSTRUCTORS(Float64, double)
+#define IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Name, ExternalType, InternalType)              \
+JS_FRIEND_API(JSObject *) JS_GetObjectAs ## Name ## Array(JSObject *obj,                  \
+uint32_t *length,               \
+ExternalType **data)            \
+{                                                                                         \
+if (!(obj = CheckedUnwrap(obj)))                                                      \
+return nullptr;                                                                   \
+\
+const Class *clasp = obj->getClass();                                                 \
+if (clasp != &TypedArrayObject::classes[TypedArrayObjectTemplate<InternalType>::ArrayTypeID()]) \
+return nullptr;                                                                   \
+\
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();                                \
+*length = tarr->length();                                                             \
+*data = static_cast<ExternalType *>(tarr->viewData());                                \
+\
+return obj;                                                                           \
+}
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Int8, int8_t, int8_t)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint8, uint8_t, uint8_t)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint8Clamped, uint8_t, uint8_clamped)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Int16, int16_t, int16_t)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint16, uint16_t, uint16_t)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Int32, int32_t, int32_t)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Uint32, uint32_t, uint32_t)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Float32, float, float)
+IMPL_TYPED_ARRAY_COMBINED_UNWRAPPERS(Float64, double, double)
+#define IMPL_TYPED_ARRAY_PROTO_CLASS(_typedArray)                              \
+{                                                                              \
+#_typedArray "Prototype",                                                  \
+JSCLASS_HAS_RESERVED_SLOTS(TypedArrayObject::RESERVED_SLOTS) |             \
+JSCLASS_HAS_PRIVATE |                                                      \
+JSCLASS_HAS_CACHED_PROTO(JSProto_##_typedArray),                           \
+JS_PropertyStub,         /* addProperty */                                 \
+JS_DeletePropertyStub,   /* delProperty */                                 \
+JS_PropertyStub,         /* getProperty */                                 \
+JS_StrictPropertyStub,   /* setProperty */                                 \
+JS_EnumerateStub,                                                          \
+JS_ResolveStub,                                                            \
+JS_ConvertStub                                                             \
+}
+#define IMPL_TYPED_ARRAY_FAST_CLASS(_typedArray)                               \
+{                                                                              \
+#_typedArray,                                                              \
+JSCLASS_HAS_RESERVED_SLOTS(TypedArrayObject::RESERVED_SLOTS) |             \
+JSCLASS_HAS_PRIVATE | JSCLASS_IMPLEMENTS_BARRIERS |                        \
+JSCLASS_HAS_CACHED_PROTO(JSProto_##_typedArray),                           \
+JS_PropertyStub,         /* addProperty */                                 \
+JS_DeletePropertyStub,   /* delProperty */                                 \
+JS_PropertyStub,         /* getProperty */                                 \
+JS_StrictPropertyStub,   /* setProperty */                                 \
+JS_EnumerateStub,                                                          \
+JS_ResolveStub,                                                            \
+JS_ConvertStub,                                                            \
+nullptr,                 /* finalize */                                    \
+nullptr,                 /* call        */                                 \
+nullptr,                 /* hasInstance */                                 \
+nullptr,                 /* construct   */                                 \
+ArrayBufferViewObject::trace, /* trace  */                                 \
+}
+template<class ArrayType>
+static inline bool
+InitTypedArrayClass(JSContext *cx)
+{
+Rooted<GlobalObject*> global(cx, cx->compartment()->maybeGlobal());
+if (global->isStandardClassResolved(ArrayType::key))
+return true;
+RootedObject proto(cx, global->createBlankPrototype(cx, ArrayType::protoClass()));
+if (!proto)
+return false;
+RootedFunction ctor(cx);
+ctor = global->createConstructor(cx, ArrayType::class_constructor,
+ClassName(ArrayType::key, cx), 3);
+if (!ctor)
+return false;
+if (!LinkConstructorAndPrototype(cx, ctor, proto))
+return false;
+RootedValue bytesValue(cx, Int32Value(ArrayType::BYTES_PER_ELEMENT));
+if (!JSObject::defineProperty(cx, ctor,
+cx->names().BYTES_PER_ELEMENT, bytesValue,
+JS_PropertyStub, JS_StrictPropertyStub,
+JSPROP_PERMANENT | JSPROP_READONLY) ||
+!JSObject::defineProperty(cx, proto,
+cx->names().BYTES_PER_ELEMENT, bytesValue,
+JS_PropertyStub, JS_StrictPropertyStub,
+JSPROP_PERMANENT | JSPROP_READONLY))
+{
+return false;
+}
+if (!ArrayType::defineGetters(cx, proto))
+return false;
+if (!JS_DefineFunctions(cx, proto, ArrayType::jsfuncs))
+return false;
+RootedFunction fun(cx);
+fun =
+NewFunction(cx, NullPtr(),
+ArrayBufferObject::createTypedArrayFromBuffer<typename ArrayType::ThisType>,
+0, JSFunction::NATIVE_FUN, global, NullPtr());
+if (!fun)
+return false;
+if (!GlobalObject::initBuiltinConstructor(cx, global, ArrayType::key, ctor, proto))
+return false;
+global->setCreateArrayFromBuffer<typename ArrayType::ThisType>(fun);
+return true;
+}
+IMPL_TYPED_ARRAY_STATICS(Int8Array);
+IMPL_TYPED_ARRAY_STATICS(Uint8Array);
+IMPL_TYPED_ARRAY_STATICS(Int16Array);
+IMPL_TYPED_ARRAY_STATICS(Uint16Array);
+IMPL_TYPED_ARRAY_STATICS(Int32Array);
+IMPL_TYPED_ARRAY_STATICS(Uint32Array);
+IMPL_TYPED_ARRAY_STATICS(Float32Array);
+IMPL_TYPED_ARRAY_STATICS(Float64Array);
+IMPL_TYPED_ARRAY_STATICS(Uint8ClampedArray);
+const Class TypedArrayObject::classes[ScalarTypeDescr::TYPE_MAX] = {
+IMPL_TYPED_ARRAY_FAST_CLASS(Int8Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Uint8Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Int16Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Uint16Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Int32Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Uint32Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Float32Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Float64Array),
+IMPL_TYPED_ARRAY_FAST_CLASS(Uint8ClampedArray)
+};
+const Class TypedArrayObject::protoClasses[ScalarTypeDescr::TYPE_MAX] = {
+IMPL_TYPED_ARRAY_PROTO_CLASS(Int8Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Uint8Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Int16Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Uint16Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Int32Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Uint32Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Float32Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Float64Array),
+IMPL_TYPED_ARRAY_PROTO_CLASS(Uint8ClampedArray)
+};
+#define CHECK(t, a) { if (t == a::IsThisClass) return true; }
+JS_FRIEND_API(bool)
+js::IsTypedArrayThisCheck(JS::IsAcceptableThis test)
+{
+CHECK(test, Int8ArrayObject);
+CHECK(test, Uint8ArrayObject);
+CHECK(test, Int16ArrayObject);
+CHECK(test, Uint16ArrayObject);
+CHECK(test, Int32ArrayObject);
+CHECK(test, Uint32ArrayObject);
+CHECK(test, Float32ArrayObject);
+CHECK(test, Float64ArrayObject);
+CHECK(test, Uint8ClampedArrayObject);
+return false;
+}
+#undef CHECK
+static JSObject *
+InitArrayBufferClass(JSContext *cx)
+{
+Rooted<GlobalObject*> global(cx, cx->compartment()->maybeGlobal());
+if (global->isStandardClassResolved(JSProto_ArrayBuffer))
+return &global->getPrototype(JSProto_ArrayBuffer).toObject();
+RootedObject arrayBufferProto(cx, global->createBlankPrototype(cx, &ArrayBufferObject::protoClass));
+if (!arrayBufferProto)
+return nullptr;
+RootedFunction ctor(cx, global->createConstructor(cx, ArrayBufferObject::class_constructor,
+cx->names().ArrayBuffer, 1));
+if (!ctor)
+return nullptr;
+if (!LinkConstructorAndPrototype(cx, ctor, arrayBufferProto))
+return nullptr;
+RootedId byteLengthId(cx, NameToId(cx->names().byteLength));
+unsigned attrs = JSPROP_SHARED | JSPROP_GETTER | JSPROP_PERMANENT;
+JSObject *getter = NewFunction(cx, NullPtr(), ArrayBufferObject::byteLengthGetter, 0,
+JSFunction::NATIVE_FUN, global, NullPtr());
+if (!getter)
+return nullptr;
+if (!DefineNativeProperty(cx, arrayBufferProto, byteLengthId, UndefinedHandleValue,
+JS_DATA_TO_FUNC_PTR(PropertyOp, getter), nullptr, attrs))
+return nullptr;
+if (!JS_DefineFunctions(cx, ctor, ArrayBufferObject::jsstaticfuncs))
+return nullptr;
+if (!JS_DefineFunctions(cx, arrayBufferProto, ArrayBufferObject::jsfuncs))
+return nullptr;
+if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_ArrayBuffer,
+ctor, arrayBufferProto))
+{
+return nullptr;
+}
+return arrayBufferProto;
+}
+const Class DataViewObject::protoClass = {
+"DataViewPrototype",
+JSCLASS_HAS_PRIVATE |
+JSCLASS_HAS_RESERVED_SLOTS(DataViewObject::RESERVED_SLOTS) |
+JSCLASS_HAS_CACHED_PROTO(JSProto_DataView),
+JS_PropertyStub,         /* addProperty */
+JS_DeletePropertyStub,   /* delProperty */
+JS_PropertyStub,         /* getProperty */
+JS_StrictPropertyStub,   /* setProperty */
+JS_EnumerateStub,
+JS_ResolveStub,
+JS_ConvertStub
+};
+const Class DataViewObject::class_ = {
+"DataView",
+JSCLASS_HAS_PRIVATE |
+JSCLASS_IMPLEMENTS_BARRIERS |
+JSCLASS_HAS_RESERVED_SLOTS(DataViewObject::RESERVED_SLOTS) |
+JSCLASS_HAS_CACHED_PROTO(JSProto_DataView),
+JS_PropertyStub,         /* addProperty */
+JS_DeletePropertyStub,   /* delProperty */
+JS_PropertyStub,         /* getProperty */
+JS_StrictPropertyStub,   /* setProperty */
+JS_EnumerateStub,
+JS_ResolveStub,
+JS_ConvertStub,
+nullptr,                 /* finalize */
+nullptr,                 /* call        */
+nullptr,                 /* hasInstance */
+nullptr,                 /* construct   */
+ArrayBufferViewObject::trace, /* trace  */
+};
+const JSFunctionSpec DataViewObject::jsfuncs[] = {
+JS_FN("getInt8",    DataViewObject::fun_getInt8,      1,0),
+JS_FN("getUint8",   DataViewObject::fun_getUint8,     1,0),
+JS_FN("getInt16",   DataViewObject::fun_getInt16,     2,0),
+JS_FN("getUint16",  DataViewObject::fun_getUint16,    2,0),
+JS_FN("getInt32",   DataViewObject::fun_getInt32,     2,0),
+JS_FN("getUint32",  DataViewObject::fun_getUint32,    2,0),
+JS_FN("getFloat32", DataViewObject::fun_getFloat32,   2,0),
+JS_FN("getFloat64", DataViewObject::fun_getFloat64,   2,0),
+JS_FN("setInt8",    DataViewObject::fun_setInt8,      2,0),
+JS_FN("setUint8",   DataViewObject::fun_setUint8,     2,0),
+JS_FN("setInt16",   DataViewObject::fun_setInt16,     3,0),
+JS_FN("setUint16",  DataViewObject::fun_setUint16,    3,0),
+JS_FN("setInt32",   DataViewObject::fun_setInt32,     3,0),
+JS_FN("setUint32",  DataViewObject::fun_setUint32,    3,0),
+JS_FN("setFloat32", DataViewObject::fun_setFloat32,   3,0),
+JS_FN("setFloat64", DataViewObject::fun_setFloat64,   3,0),
+JS_FS_END
+};
+template<Value ValueGetter(DataViewObject *view)>
+bool
+DataViewObject::getterImpl(JSContext *cx, CallArgs args)
+{
+args.rval().set(ValueGetter(&args.thisv().toObject().as<DataViewObject>()));
+return true;
+}
+template<Value ValueGetter(DataViewObject *view)>
+bool
+DataViewObject::getter(JSContext *cx, unsigned argc, Value *vp)
+{
+CallArgs args = CallArgsFromVp(argc, vp);
+return CallNonGenericMethod<is, getterImpl<ValueGetter> >(cx, args);
+}
+template<Value ValueGetter(DataViewObject *view)>
+bool
+DataViewObject::defineGetter(JSContext *cx, PropertyName *name, HandleObject proto)
+{
+RootedId id(cx, NameToId(name));
+unsigned attrs = JSPROP_SHARED | JSPROP_GETTER | JSPROP_PERMANENT;
+Rooted<GlobalObject*> global(cx, cx->compartment()->maybeGlobal());
+JSObject *getter = NewFunction(cx, NullPtr(), DataViewObject::getter<ValueGetter>, 0,
+JSFunction::NATIVE_FUN, global, NullPtr());
+if (!getter)
+return false;
+return DefineNativeProperty(cx, proto, id, UndefinedHandleValue,
+JS_DATA_TO_FUNC_PTR(PropertyOp, getter), nullptr, attrs);
+}
+/* static */ bool
+DataViewObject::initClass(JSContext *cx)
+{
+Rooted<GlobalObject*> global(cx, cx->compartment()->maybeGlobal());
+if (global->isStandardClassResolved(JSProto_DataView))
+return true;
+RootedObject proto(cx, global->createBlankPrototype(cx, &DataViewObject::protoClass));
+if (!proto)
+return false;
+RootedFunction ctor(cx, global->createConstructor(cx, DataViewObject::class_constructor,
+cx->names().DataView, 3));
+if (!ctor)
+return false;
+if (!LinkConstructorAndPrototype(cx, ctor, proto))
+return false;
+if (!defineGetter<bufferValue>(cx, cx->names().buffer, proto))
+return false;
+if (!defineGetter<byteLengthValue>(cx, cx->names().byteLength, proto))
+return false;
+if (!defineGetter<byteOffsetValue>(cx, cx->names().byteOffset, proto))
+return false;
+if (!JS_DefineFunctions(cx, proto, DataViewObject::jsfuncs))
+return false;
+/*
+* Create a helper function to implement the craziness of
+* |new DataView(new otherWindow.ArrayBuffer())|, and install it in the
+* global for use by the DataViewObject constructor.
+*/
+RootedFunction fun(cx, NewFunction(cx, NullPtr(), ArrayBufferObject::createDataViewForThis,
+0, JSFunction::NATIVE_FUN, global, NullPtr()));
+if (!fun)
+return false;
+if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_DataView, ctor, proto))
+return false;
+global->setCreateDataViewForThis(fun);
+return true;
+}
+void
+DataViewObject::neuter(void *newData)
+{
+setSlot(BYTELENGTH_SLOT, Int32Value(0));
+setSlot(BYTEOFFSET_SLOT, Int32Value(0));
+setPrivate(newData);
+}
+JSObject *
+js_InitTypedArrayClasses(JSContext *cx, HandleObject obj)
+{
+if (!InitTypedArrayClass<Int8ArrayObject>(cx) ||
+!InitTypedArrayClass<Uint8ArrayObject>(cx) ||
+!InitTypedArrayClass<Int16ArrayObject>(cx) ||
+!InitTypedArrayClass<Uint16ArrayObject>(cx) ||
+!InitTypedArrayClass<Int32ArrayObject>(cx) ||
+!InitTypedArrayClass<Uint32ArrayObject>(cx) ||
+!InitTypedArrayClass<Float32ArrayObject>(cx) ||
+!InitTypedArrayClass<Float64ArrayObject>(cx) ||
+!InitTypedArrayClass<Uint8ClampedArrayObject>(cx) ||
+!DataViewObject::initClass(cx))
+{
+return nullptr;
+}
+return InitArrayBufferClass(cx);
+}
+bool
+js::IsTypedArrayConstructor(HandleValue v, uint32_t type)
+{
+switch (type) {
+case ScalarTypeDescr::TYPE_INT8:
+return IsNativeFunction(v, Int8ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_UINT8:
+return IsNativeFunction(v, Uint8ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_INT16:
+return IsNativeFunction(v, Int16ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_UINT16:
+return IsNativeFunction(v, Uint16ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_INT32:
+return IsNativeFunction(v, Int32ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_UINT32:
+return IsNativeFunction(v, Uint32ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_FLOAT32:
+return IsNativeFunction(v, Float32ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_FLOAT64:
+return IsNativeFunction(v, Float64ArrayObject::class_constructor);
+case ScalarTypeDescr::TYPE_UINT8_CLAMPED:
+return IsNativeFunction(v, Uint8ClampedArrayObject::class_constructor);
+}
+MOZ_ASSUME_UNREACHABLE("unexpected typed array type");
+}
+bool
+js::IsTypedArrayBuffer(HandleValue v)
+{
+return v.isObject() &&
+(v.toObject().is<ArrayBufferObject>() ||
+v.toObject().is<SharedArrayBufferObject>());
+}
+ArrayBufferObject &
+js::AsTypedArrayBuffer(HandleValue v)
+{
+JS_ASSERT(IsTypedArrayBuffer(v));
+if (v.toObject().is<ArrayBufferObject>())
+return v.toObject().as<ArrayBufferObject>();
+return v.toObject().as<SharedArrayBufferObject>();
+}
+bool
+js::StringIsTypedArrayIndex(JSLinearString *str, uint64_t *indexp)
+{
+const jschar *s = str->chars();
+const jschar *end = s + str->length();
+if (s == end)
+return false;
+bool negative = false;
+if (*s == '-') {
+negative = true;
+if (++s == end)
+return false;
+}
+if (!JS7_ISDEC(*s))
+return false;
+uint64_t index = 0;
+uint32_t digit = JS7_UNDEC(*s++);
+/* Don't allow leading zeros. */
+if (digit == 0 && s != end)
+return false;
+index = digit;
+for (; s < end; s++) {
+if (!JS7_ISDEC(*s))
+return false;
+digit = JS7_UNDEC(*s);
+/* Watch for overflows. */
+if ((UINT64_MAX - digit) / 10 < index)
+index = UINT64_MAX;
+else
+index = 10 * index + digit;
+}
+if (negative)
+*indexp = UINT64_MAX;
+else
+*indexp = index;
+return true;
+}
+/* JS Friend API */
+JS_FRIEND_API(bool)
+JS_IsTypedArrayObject(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+return obj ? obj->is<TypedArrayObject>() : false;
+}
+JS_FRIEND_API(uint32_t)
+JS_GetTypedArrayLength(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return 0;
+return obj->as<TypedArrayObject>().length();
+}
+JS_FRIEND_API(uint32_t)
+JS_GetTypedArrayByteOffset(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return 0;
+return obj->as<TypedArrayObject>().byteOffset();
+}
+JS_FRIEND_API(uint32_t)
+JS_GetTypedArrayByteLength(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return 0;
+return obj->as<TypedArrayObject>().byteLength();
+}
+JS_FRIEND_API(JSArrayBufferViewType)
+JS_GetArrayBufferViewType(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return ArrayBufferView::TYPE_MAX;
+if (obj->is<TypedArrayObject>())
+return static_cast<JSArrayBufferViewType>(obj->as<TypedArrayObject>().type());
+else if (obj->is<DataViewObject>())
+return ArrayBufferView::TYPE_DATAVIEW;
+MOZ_ASSUME_UNREACHABLE("invalid ArrayBufferView type");
+}
+JS_FRIEND_API(int8_t *)
+JS_GetInt8ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_INT8);
+return static_cast<int8_t *>(tarr->viewData());
+}
+JS_FRIEND_API(uint8_t *)
+JS_GetUint8ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_UINT8);
+return static_cast<uint8_t *>(tarr->viewData());
+}
+JS_FRIEND_API(uint8_t *)
+JS_GetUint8ClampedArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_UINT8_CLAMPED);
+return static_cast<uint8_t *>(tarr->viewData());
+}
+JS_FRIEND_API(int16_t *)
+JS_GetInt16ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_INT16);
+return static_cast<int16_t *>(tarr->viewData());
+}
+JS_FRIEND_API(uint16_t *)
+JS_GetUint16ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_UINT16);
+return static_cast<uint16_t *>(tarr->viewData());
+}
+JS_FRIEND_API(int32_t *)
+JS_GetInt32ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_INT32);
+return static_cast<int32_t *>(tarr->viewData());
+}
+JS_FRIEND_API(uint32_t *)
+JS_GetUint32ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_UINT32);
+return static_cast<uint32_t *>(tarr->viewData());
+}
+JS_FRIEND_API(float *)
+JS_GetFloat32ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_FLOAT32);
+return static_cast<float *>(tarr->viewData());
+}
+JS_FRIEND_API(double *)
+JS_GetFloat64ArrayData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+TypedArrayObject *tarr = &obj->as<TypedArrayObject>();
+JS_ASSERT(tarr->type() == ArrayBufferView::TYPE_FLOAT64);
+return static_cast<double *>(tarr->viewData());
+}
+JS_FRIEND_API(bool)
+JS_IsDataViewObject(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+return obj ? obj->is<DataViewObject>() : false;
+}
+JS_FRIEND_API(uint32_t)
+JS_GetDataViewByteOffset(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return 0;
+return obj->as<DataViewObject>().byteOffset();
+}
+JS_FRIEND_API(void *)
+JS_GetDataViewData(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return nullptr;
+return obj->as<DataViewObject>().dataPointer();
+}
+JS_FRIEND_API(uint32_t)
+JS_GetDataViewByteLength(JSObject *obj)
+{
+obj = CheckedUnwrap(obj);
+if (!obj)
+return 0;
+return obj->as<DataViewObject>().byteLength();
+}

The Tor Browser / file comparison

comparison: js/src/vm/TypedArrayObject.cpp

js/src/vm/TypedArrayObject.cpp