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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 "use strict";
     29 
     30 var $ArrayBuffer = global.ArrayBuffer;
     31 
     32 // -------------------------------------------------------------------
     33 
     34 function ArrayBufferConstructor(length) { // length = 1
     35   if (%_IsConstructCall()) {
     36     var byteLength = ToPositiveInteger(length, 'invalid_array_buffer_length');
     37     %ArrayBufferInitialize(this, byteLength);
     38   } else {
     39     throw MakeTypeError('constructor_not_function', ["ArrayBuffer"]);
     40   }
     41 }
     42 
     43 function ArrayBufferGetByteLength() {
     44   if (!IS_ARRAYBUFFER(this)) {
     45     throw MakeTypeError('incompatible_method_receiver',
     46                         ['ArrayBuffer.prototype.byteLength', this]);
     47   }
     48   return %ArrayBufferGetByteLength(this);
     49 }
     50 
     51 // ES6 Draft 15.13.5.5.3
     52 function ArrayBufferSlice(start, end) {
     53   if (!IS_ARRAYBUFFER(this)) {
     54     throw MakeTypeError('incompatible_method_receiver',
     55                         ['ArrayBuffer.prototype.slice', this]);
     56   }
     57 
     58   var relativeStart = TO_INTEGER(start);
     59   var first;
     60   var byte_length = %ArrayBufferGetByteLength(this);
     61   if (relativeStart < 0) {
     62     first = MathMax(byte_length + relativeStart, 0);
     63   } else {
     64     first = MathMin(relativeStart, byte_length);
     65   }
     66   var relativeEnd = IS_UNDEFINED(end) ? byte_length : TO_INTEGER(end);
     67   var fin;
     68   if (relativeEnd < 0) {
     69     fin = MathMax(byte_length + relativeEnd, 0);
     70   } else {
     71     fin = MathMin(relativeEnd, byte_length);
     72   }
     73 
     74   if (fin < first) {
     75     fin = first;
     76   }
     77   var newLen = fin - first;
     78   // TODO(dslomov): implement inheritance
     79   var result = new $ArrayBuffer(newLen);
     80 
     81   %ArrayBufferSliceImpl(this, result, first);
     82   return result;
     83 }
     84 
     85 function ArrayBufferIsView(obj) {
     86   return %ArrayBufferIsView(obj);
     87 }
     88 
     89 function SetUpArrayBuffer() {
     90   %CheckIsBootstrapping();
     91 
     92   // Set up the ArrayBuffer constructor function.
     93   %SetCode($ArrayBuffer, ArrayBufferConstructor);
     94   %FunctionSetPrototype($ArrayBuffer, new $Object());
     95 
     96   // Set up the constructor property on the ArrayBuffer prototype object.
     97   %SetProperty($ArrayBuffer.prototype, "constructor", $ArrayBuffer, DONT_ENUM);
     98 
     99   InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength);
    100 
    101   InstallFunctions($ArrayBuffer, DONT_ENUM, $Array(
    102       "isView", ArrayBufferIsView
    103   ));
    104 
    105   InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array(
    106       "slice", ArrayBufferSlice
    107   ));
    108 }
    109 
    110 SetUpArrayBuffer();
    111