| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| "use strict"; |
| |
| // This file relies on the fact that the following declaration has been made |
| // in runtime.js: |
| // var $Array = global.Array; |
| |
| var $ArrayBuffer = global.__ArrayBuffer; |
| |
| // ------------------------------------------------------------------- |
| |
| function ArrayBufferConstructor(byteLength) { // length = 1 |
| if (%_IsConstructCall()) { |
| var l = TO_POSITIVE_INTEGER(byteLength); |
| %ArrayBufferInitialize(this, l); |
| } else { |
| return new $ArrayBuffer(byteLength); |
| } |
| } |
| |
| function ArrayBufferGetByteLength() { |
| if (!IS_ARRAYBUFFER(this)) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['ArrayBuffer.prototype.byteLength', this]); |
| } |
| return %ArrayBufferGetByteLength(this); |
| } |
| |
| // ES6 Draft 15.13.5.5.3 |
| function ArrayBufferSlice(start, end) { |
| if (!IS_ARRAYBUFFER(this)) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['ArrayBuffer.prototype.slice', this]); |
| } |
| |
| var relativeStart = TO_INTEGER(start); |
| var first; |
| if (relativeStart < 0) { |
| first = MathMax(this.byteLength + relativeStart, 0); |
| } else { |
| first = MathMin(relativeStart, this.byteLength); |
| } |
| var relativeEnd = IS_UNDEFINED(end) ? this.byteLength : TO_INTEGER(end); |
| var fin; |
| if (relativeEnd < 0) { |
| fin = MathMax(this.byteLength + relativeEnd, 0); |
| } else { |
| fin = MathMin(relativeEnd, this.byteLength); |
| } |
| |
| var newLen = fin - first; |
| // TODO(dslomov): implement inheritance |
| var result = new $ArrayBuffer(newLen); |
| |
| %ArrayBufferSliceImpl(this, result, first); |
| return result; |
| } |
| |
| // --------------- Typed Arrays --------------------- |
| |
| function CreateTypedArrayConstructor(name, elementSize, arrayId, constructor) { |
| return function (buffer, byteOffset, length) { |
| if (%_IsConstructCall()) { |
| if (!IS_ARRAYBUFFER(buffer)) { |
| throw MakeTypeError("Type error!"); |
| } |
| var offset = IS_UNDEFINED(byteOffset) |
| ? 0 : offset = TO_POSITIVE_INTEGER(byteOffset); |
| |
| if (offset % elementSize !== 0) { |
| throw MakeRangeError("invalid_typed_array_alignment", |
| "start offset", name, elementSize); |
| } |
| var bufferByteLength = %ArrayBufferGetByteLength(buffer); |
| if (offset >= bufferByteLength) { |
| throw MakeRangeError("invalid_typed_array_offset"); |
| } |
| |
| var newByteLength; |
| var newLength; |
| if (IS_UNDEFINED(length)) { |
| if (bufferByteLength % elementSize !== 0) { |
| throw MakeRangeError("invalid_typed_array_alignment", |
| "byte length", name, elementSize); |
| } |
| newByteLength = bufferByteLength - offset; |
| newLength = newByteLength / elementSize; |
| } else { |
| var newLength = TO_POSITIVE_INTEGER(length); |
| newByteLength = newLength * elementSize; |
| } |
| if (newByteLength > bufferByteLength) { |
| throw MakeRangeError("invalid_typed_array_length"); |
| } |
| %TypedArrayInitialize(this, arrayId, buffer, offset, newByteLength); |
| } else { |
| return new constructor(buffer, byteOffset, length); |
| } |
| } |
| } |
| |
| function TypedArrayGetBuffer() { |
| return %TypedArrayGetBuffer(this); |
| } |
| |
| function TypedArrayGetByteLength() { |
| return %TypedArrayGetByteLength(this); |
| } |
| |
| function TypedArrayGetByteOffset() { |
| return %TypedArrayGetByteOffset(this); |
| } |
| |
| function TypedArrayGetLength() { |
| return %TypedArrayGetLength(this); |
| } |
| |
| |
| // ------------------------------------------------------------------- |
| |
| function SetUpArrayBuffer() { |
| %CheckIsBootstrapping(); |
| |
| // Set up the ArrayBuffer constructor function. |
| %SetCode($ArrayBuffer, ArrayBufferConstructor); |
| %FunctionSetPrototype($ArrayBuffer, new $Object()); |
| |
| // Set up the constructor property on the ArrayBuffer prototype object. |
| %SetProperty($ArrayBuffer.prototype, "constructor", $ArrayBuffer, DONT_ENUM); |
| |
| InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength); |
| |
| InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array( |
| "slice", ArrayBufferSlice |
| )); |
| } |
| |
| SetUpArrayBuffer(); |
| |
| function SetupTypedArray(arrayId, name, constructor, elementSize) { |
| var f = CreateTypedArrayConstructor(name, elementSize, |
| arrayId, constructor); |
| %SetCode(constructor, f); |
| %FunctionSetPrototype(constructor, new $Object()); |
| |
| %SetProperty(constructor.prototype, |
| "constructor", constructor, DONT_ENUM); |
| %SetProperty(constructor.prototype, |
| "BYTES_PER_ELEMENT", elementSize, |
| READ_ONLY | DONT_ENUM | DONT_DELETE); |
| InstallGetter(constructor.prototype, "buffer", TypedArrayGetBuffer); |
| InstallGetter(constructor.prototype, "byteOffset", TypedArrayGetByteOffset); |
| InstallGetter(constructor.prototype, "byteLength", TypedArrayGetByteLength); |
| InstallGetter(constructor.prototype, "length", TypedArrayGetLength); |
| } |
| |
| // arrayIds below should be synchronized with Runtime_TypedArrayInitialize. |
| SetupTypedArray(1, "Uint8Array", global.__Uint8Array, 1); |
| SetupTypedArray(2, "Int8Array", global.__Int8Array, 1); |
| SetupTypedArray(3, "Uint16Array", global.__Uint16Array, 2); |
| SetupTypedArray(4, "Int16Array", global.__Int16Array, 2); |
| SetupTypedArray(5, "Uint32Array", global.__Uint32Array, 4); |
| SetupTypedArray(6, "Int32Array", global.__Int32Array, 4); |
| SetupTypedArray(7, "Float32Array", global.__Float32Array, 4); |
| SetupTypedArray(8, "Float64Array", global.__Float64Array, 8); |
| |