diff -r 000000000000 -r 6474c204b198 js/src/jsapi-tests/testTypedArrays.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jsapi-tests/testTypedArrays.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,172 @@
+/* -*- 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 "jsfriendapi.h"
+
+#include "jsapi-tests/tests.h"
+
+using namespace js;
+
+BEGIN_TEST(testTypedArrays)
+{
+    bool ok = true;
+
+    ok = ok &&
+        TestPlainTypedArray<JS_NewInt8Array, int8_t, JS_GetInt8ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewUint8Array, uint8_t, JS_GetUint8ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewUint8ClampedArray, uint8_t, JS_GetUint8ClampedArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewInt16Array, int16_t, JS_GetInt16ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewUint16Array, uint16_t, JS_GetUint16ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewInt32Array, int32_t, JS_GetInt32ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewUint32Array, uint32_t, JS_GetUint32ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewFloat32Array, float, JS_GetFloat32ArrayData>(cx) &&
+        TestPlainTypedArray<JS_NewFloat64Array, double, JS_GetFloat64ArrayData>(cx);
+
+    size_t nbytes = sizeof(double) * 8;
+    RootedObject buffer(cx, JS_NewArrayBuffer(cx, nbytes));
+    CHECK(JS_IsArrayBufferObject(buffer));
+
+    RootedObject proto(cx);
+    JS_GetPrototype(cx, buffer, &proto);
+    CHECK(!JS_IsArrayBufferObject(proto));
+    RootedObject dummy(cx, JS_GetParent(proto));
+    CHECK(!JS_IsArrayBufferObject(dummy));
+
+    CHECK_EQUAL(JS_GetArrayBufferByteLength(buffer), nbytes);
+    memset(JS_GetStableArrayBufferData(cx, buffer), 1, nbytes);
+
+    ok = ok &&
+        TestArrayFromBuffer<JS_NewInt8ArrayWithBuffer, JS_NewInt8ArrayFromArray, int8_t, JS_GetInt8ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewUint8ArrayWithBuffer, JS_NewUint8ArrayFromArray, uint8_t, JS_GetUint8ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewUint8ClampedArrayWithBuffer, JS_NewUint8ClampedArrayFromArray, uint8_t, JS_GetUint8ClampedArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewInt16ArrayWithBuffer, JS_NewInt16ArrayFromArray, int16_t, JS_GetInt16ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewUint16ArrayWithBuffer, JS_NewUint16ArrayFromArray, uint16_t, JS_GetUint16ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewInt32ArrayWithBuffer, JS_NewInt32ArrayFromArray, int32_t, JS_GetInt32ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewUint32ArrayWithBuffer, JS_NewUint32ArrayFromArray, uint32_t, JS_GetUint32ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewFloat32ArrayWithBuffer, JS_NewFloat32ArrayFromArray, float, JS_GetFloat32ArrayData>(cx) &&
+        TestArrayFromBuffer<JS_NewFloat64ArrayWithBuffer, JS_NewFloat64ArrayFromArray, double, JS_GetFloat64ArrayData>(cx);
+
+    return ok;
+}
+
+template<JSObject *Create(JSContext *, uint32_t),
+         typename Element,
+         Element *GetData(JSObject *)>
+bool
+TestPlainTypedArray(JSContext *cx)
+{
+    {
+        RootedObject notArray(cx, Create(cx, UINT32_MAX));
+        CHECK(!notArray);
+    }
+
+    RootedObject array(cx, Create(cx, 7));
+    CHECK(JS_IsTypedArrayObject(array));
+    RootedObject proto(cx);
+    JS_GetPrototype(cx, array, &proto);
+    CHECK(!JS_IsTypedArrayObject(proto));
+    RootedObject dummy(cx, JS_GetParent(proto));
+    CHECK(!JS_IsTypedArrayObject(dummy));
+
+    CHECK_EQUAL(JS_GetTypedArrayLength(array), 7);
+    CHECK_EQUAL(JS_GetTypedArrayByteOffset(array), 0);
+    CHECK_EQUAL(JS_GetTypedArrayByteLength(array), sizeof(Element) * 7);
+
+    Element *data;
+    CHECK(data = GetData(array));
+    *data = 13;
+    RootedValue v(cx);
+    CHECK(JS_GetElement(cx, array, 0, &v));
+    CHECK_SAME(v, INT_TO_JSVAL(13));
+
+    return true;
+}
+
+template<JSObject *CreateWithBuffer(JSContext *, JS::HandleObject, uint32_t, int32_t),
+         JSObject *CreateFromArray(JSContext *, JS::HandleObject),
+         typename Element,
+         Element *GetData(JSObject *)>
+bool
+TestArrayFromBuffer(JSContext *cx)
+{
+    size_t elts = 8;
+    size_t nbytes = elts * sizeof(Element);
+    RootedObject buffer(cx, JS_NewArrayBuffer(cx, nbytes));
+    uint8_t *bufdata;
+    CHECK(bufdata = JS_GetStableArrayBufferData(cx, buffer));
+    memset(bufdata, 1, nbytes);
+
+    {
+        RootedObject notArray(cx, CreateWithBuffer(cx, buffer, UINT32_MAX, -1));
+        CHECK(!notArray);
+    }
+
+    RootedObject array(cx, CreateWithBuffer(cx, buffer, 0, -1));
+    CHECK_EQUAL(JS_GetTypedArrayLength(array), elts);
+    CHECK_EQUAL(JS_GetTypedArrayByteOffset(array), 0);
+    CHECK_EQUAL(JS_GetTypedArrayByteLength(array), nbytes);
+    CHECK_EQUAL(JS_GetArrayBufferViewBuffer(cx, array), (JSObject*) buffer);
+
+    Element *data;
+    CHECK(data = GetData(array));
+    CHECK(bufdata = JS_GetStableArrayBufferData(cx, buffer));
+    CHECK_EQUAL((void*) data, (void*) bufdata);
+
+    CHECK_EQUAL(*bufdata, 1);
+    CHECK_EQUAL(*reinterpret_cast<uint8_t*>(data), 1);
+
+    RootedObject shortArray(cx, CreateWithBuffer(cx, buffer, 0, elts / 2));
+    CHECK_EQUAL(JS_GetTypedArrayLength(shortArray), elts / 2);
+    CHECK_EQUAL(JS_GetTypedArrayByteOffset(shortArray), 0);
+    CHECK_EQUAL(JS_GetTypedArrayByteLength(shortArray), nbytes / 2);
+
+    RootedObject ofsArray(cx, CreateWithBuffer(cx, buffer, nbytes / 2, -1));
+    CHECK_EQUAL(JS_GetTypedArrayLength(ofsArray), elts / 2);
+    CHECK_EQUAL(JS_GetTypedArrayByteOffset(ofsArray), nbytes / 2);
+    CHECK_EQUAL(JS_GetTypedArrayByteLength(ofsArray), nbytes / 2);
+
+    // Make sure all 3 views reflect the same buffer at the expected locations
+    JS::RootedValue v(cx, INT_TO_JSVAL(39));
+    JS_SetElement(cx, array, 0, v);
+    JS::RootedValue v2(cx);
+    CHECK(JS_GetElement(cx, array, 0, &v2));
+    CHECK_SAME(v, v2);
+    CHECK(JS_GetElement(cx, shortArray, 0, &v2));
+    CHECK_SAME(v, v2);
+    CHECK_EQUAL(long(JSVAL_TO_INT(v)), long(reinterpret_cast<Element*>(data)[0]));
+
+    v = INT_TO_JSVAL(40);
+    JS_SetElement(cx, array, elts / 2, v);
+    CHECK(JS_GetElement(cx, array, elts / 2, &v2));
+    CHECK_SAME(v, v2);
+    CHECK(JS_GetElement(cx, ofsArray, 0, &v2));
+    CHECK_SAME(v, v2);
+    CHECK_EQUAL(long(JSVAL_TO_INT(v)), long(reinterpret_cast<Element*>(data)[elts / 2]));
+
+    v = INT_TO_JSVAL(41);
+    JS_SetElement(cx, array, elts - 1, v);
+    CHECK(JS_GetElement(cx, array, elts - 1, &v2));
+    CHECK_SAME(v, v2);
+    CHECK(JS_GetElement(cx, ofsArray, elts / 2 - 1, &v2));
+    CHECK_SAME(v, v2);
+    CHECK_EQUAL(long(JSVAL_TO_INT(v)), long(reinterpret_cast<Element*>(data)[elts - 1]));
+
+    JS::RootedObject copy(cx, CreateFromArray(cx, array));
+    CHECK(JS_GetElement(cx, array, 0, &v));
+    CHECK(JS_GetElement(cx, copy, 0, &v2));
+    CHECK_SAME(v, v2);
+
+    /* The copy should not see changes in the original */
+    v2 = INT_TO_JSVAL(42);
+    JS_SetElement(cx, array, 0, v2);
+    CHECK(JS_GetElement(cx, copy, 0, &v2));
+    CHECK_SAME(v2, v); /* v is still the original value from 'array' */
+
+    return true;
+}
+
+END_TEST(testTypedArrays)