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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 sub = stdlib.Atomics.sub;
     16   var fround = stdlib.Math.fround;
     17 
     18   function subi8(i, x) {
     19     i = i | 0;
     20     x = x | 0;
     21     return sub(MEM8, i, x)|0;
     22   }
     23 
     24   function subi16(i, x) {
     25     i = i | 0;
     26     x = x | 0;
     27     return sub(MEM16, i, x)|0;
     28   }
     29 
     30   function subi32(i, x) {
     31     i = i | 0;
     32     x = x | 0;
     33     return sub(MEM32, i, x)|0;
     34   }
     35 
     36   function subu8(i, x) {
     37     i = i | 0;
     38     x = x >>> 0;
     39     return sub(MEMU8, i, x)>>>0;
     40   }
     41 
     42   function subu16(i, x) {
     43     i = i | 0;
     44     x = x >>> 0;
     45     return sub(MEMU16, i, x)>>>0;
     46   }
     47 
     48   function subu32(i, x) {
     49     i = i | 0;
     50     x = x >>> 0;
     51     return sub(MEMU32, i, x)>>>0;
     52   }
     53 
     54   return {
     55     subi8: subi8,
     56     subi16: subi16,
     57     subi32: subi32,
     58     subu8: subu8,
     59     subu16: subu16,
     60     subu32: subu32,
     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   ta[0] = 30;
     77   assertEquals(30, f(0, 10), name);
     78   assertEquals(20, ta[0]);
     79   assertEquals(20, f(0, 10), name);
     80   assertEquals(10, ta[0]);
     81   // out of bounds
     82   assertThrows(function() { f(-1, 0); });
     83   assertThrows(function() { f(ta.length, 0); });
     84 }
     85 
     86 function testElement(m, offset) {
     87   testElementType(Int8Array, m.subi8, offset);
     88   testElementType(Int16Array, m.subi16, offset);
     89   testElementType(Int32Array, m.subi32, offset);
     90   testElementType(Uint8Array, m.subu8, offset);
     91   testElementType(Uint16Array, m.subu16, offset);
     92   testElementType(Uint32Array, m.subu32, offset);
     93 }
     94 
     95 var offset = 0;
     96 var sab = new SharedArrayBuffer(16);
     97 var m1 = Module(this, {}, sab, offset);
     98 testElement(m1, offset);
     99 
    100 offset = 32;
    101 sab = new SharedArrayBuffer(64);
    102 var m2 = Module(this, {}, sab, offset);
    103 testElement(m2, offset);
    104