diff -r 000000000000 -r 6474c204b198 js/src/vm/TypedArrayObject.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/vm/TypedArrayObject.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,2761 @@
+/* -*- 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();
+}