CSE2410 Fall 2014 Bounce

// 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";

var $ArrayBuffer = global.ArrayBuffer;

// -------------------------------------------------------------------

function ArrayBufferConstructor(length) { // length = 1

  if (%_IsConstructCall()) {

    var byteLength = ToPositiveInteger(length, 'invalid_array_buffer_length');

    %ArrayBufferInitialize(this, byteLength);

  } else {

    throw MakeTypeError('constructor_not_function', ["ArrayBuffer"]);

  }

}

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);

  }

  if (fin < first) {

    fin = first;

  }

  var newLen = fin - first;

  // TODO(dslomov): implement inheritance

  var result = new $ArrayBuffer(newLen);

  %ArrayBufferSliceImpl(this, result, first);

  return result;

}

function ArrayBufferIsView(obj) {

  return %ArrayBufferIsView(obj);

}

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, DONT_ENUM, $Array(

      "isView", ArrayBufferIsView

  ));

  InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array(

      "slice", ArrayBufferSlice

  ));

}

SetUpArrayBuffer();