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      1 // Copyright 2015 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Flags: --harmony-sharedarraybuffer
      6 
      7 function Module(stdlib, foreign, heap, offset) {
      8   "use asm";
      9   var MEM8 = new stdlib.Int8Array(heap, offset);
     10   var MEM16 = new stdlib.Int16Array(heap, offset);
     11   var MEM32 = new stdlib.Int32Array(heap, offset);
     12   var MEMU8 = new stdlib.Uint8Array(heap, offset);
     13   var MEMU16 = new stdlib.Uint16Array(heap, offset);
     14   var MEMU32 = new stdlib.Uint32Array(heap, offset);
     15   var store = stdlib.Atomics.store;
     16   var fround = stdlib.Math.fround;
     17 
     18   function storei8(i, x) {
     19     i = i | 0;
     20     x = x | 0;
     21     return store(MEM8, i, x)|0;
     22   }
     23 
     24   function storei16(i, x) {
     25     i = i | 0;
     26     x = x | 0;
     27     return store(MEM16, i, x)|0;
     28   }
     29 
     30   function storei32(i, x) {
     31     i = i | 0;
     32     x = x | 0;
     33     return store(MEM32, i, x)|0;
     34   }
     35 
     36   function storeu8(i, x) {
     37     i = i | 0;
     38     x = x >>> 0;
     39     return store(MEMU8, i, x)>>>0;
     40   }
     41 
     42   function storeu16(i, x) {
     43     i = i | 0;
     44     x = x >>> 0;
     45     return store(MEMU16, i, x)>>>0;
     46   }
     47 
     48   function storeu32(i, x) {
     49     i = i | 0;
     50     x = x >>> 0;
     51     return store(MEMU32, i, x)>>>0;
     52   }
     53 
     54   return {
     55     storei8: storei8,
     56     storei16: storei16,
     57     storei32: storei32,
     58     storeu8: storeu8,
     59     storeu16: storeu16,
     60     storeu32: storeu32,
     61   };
     62 }
     63 
     64 function clearArray() {
     65   var ui8 = new Uint8Array(sab);
     66   for (var i = 0; i < sab.byteLength; ++i) {
     67     ui8[i] = 0;
     68   }
     69 }
     70 
     71 function testElementType(taConstr, f, offset) {
     72   clearArray();
     73 
     74   var ta = new taConstr(sab, offset);
     75   var name = Object.prototype.toString.call(ta);
     76   assertEquals(10, f(0, 10), name);
     77   assertEquals(10, ta[0]);
     78   // out of bounds
     79   assertThrows(function() { f(-1, 0); });
     80   assertThrows(function() { f(ta.length, 0); });
     81 }
     82 
     83 function testElement(m, offset) {
     84   testElementType(Int8Array, m.storei8, offset);
     85   testElementType(Int16Array, m.storei16, offset);
     86   testElementType(Int32Array, m.storei32, offset);
     87   testElementType(Uint8Array, m.storeu8, offset);
     88   testElementType(Uint16Array, m.storeu16, offset);
     89   testElementType(Uint32Array, m.storeu32, offset);
     90 }
     91 
     92 var offset = 0;
     93 var sab = new SharedArrayBuffer(16);
     94 var m1 = Module(this, {}, sab, offset);
     95 testElement(m1, offset);
     96 
     97 offset = 32;
     98 sab = new SharedArrayBuffer(64);
     99 var m2 = Module(this, {}, sab, offset);
    100 testElement(m2, offset);
    101