Implement Atomics API

test/mjsunit/asm/atomics-load.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-atomics --harmony-sharedarraybuffer
+
+function Module(stdlib, foreign, heap) {
+  "use asm";
+  var MEM8 = new stdlib.Int8Array(heap);
+  var MEM16 = new stdlib.Int16Array(heap);
+  var MEM32 = new stdlib.Int32Array(heap);
+  var MEMU8 = new stdlib.Uint8Array(heap);
+  var MEMU16 = new stdlib.Uint16Array(heap);
+  var MEMU32 = new stdlib.Uint32Array(heap);
+  var MEMF32 = new stdlib.Float32Array(heap);
+  var MEMF64 = new stdlib.Float64Array(heap);
+  var load = stdlib.Atomics.load;
+  var fround = stdlib.Math.fround;
+
+  function loadi8(i) {
+    i = i | 0;
+    return load(MEM8, i)|0;
+  }
+
+  function loadi16(i) {
+    i = i | 0;
+    return load(MEM16, i)|0;
+  }
+
+  function loadi32(i) {
+    i = i | 0;
+    return load(MEM32, i)|0;
+  }
+
+  function loadu8(i) {
+    i = i | 0;
+    return load(MEMU8, i)>>>0;
+  }
+
+  function loadu16(i) {
+    i = i | 0;
+    return load(MEMU16, i)>>>0;
+  }
+
+  function loadu32(i) {
+    i = i | 0;
+    return load(MEMU32, i)>>>0;
+  }
+
+  function loadf32(i) {
+    i = i | 0;
+    return fround(load(MEMF32, i));
+  }
+
+  function loadf64(i) {
+    i = i | 0;
+    return +load(MEMF64, i);
+  }
+
+  return {
+    loadi8: loadi8,
+    loadi16: loadi16,
+    loadi32: loadi32,
+    loadu8: loadu8,
+    loadu16: loadu16,
+    loadu32: loadu32,
+    loadf32: loadf32,
+    loadf64: loadf64
+  };
+}
+
+var sab = new SharedArrayBuffer(16);
+var m = Module(this, {}, sab);
+
+function clearArray() {
+  var ui8 = new Uint8Array(sab);
+  for (var i = 0; i < sab.byteLength; ++i) {
+    ui8[i] = 0;
+  }
+}
+
+function testElementType(taConstr, f, oobValue) {
+  clearArray();
+
+  var ta = new taConstr(sab);
+  var name = Object.prototype.toString.call(ta);
+  ta[0] = 10;
+  assertEquals(10, f(0), name);
+  assertEquals(0, f(1), name);
+  // out of bounds
+  assertEquals(oobValue, f(-1), name);
+  assertEquals(oobValue, f(ta.length), name);
+}
+
+testElementType(Int8Array, m.loadi8, 0);
+testElementType(Int16Array, m.loadi16, 0);
+testElementType(Int32Array, m.loadi32, 0);
+testElementType(Uint8Array, m.loadu8, 0);
+testElementType(Uint16Array, m.loadu16, 0);
+testElementType(Uint32Array, m.loadu32, 0);
+testElementType(Float32Array, m.loadf32, NaN);
+testElementType(Float64Array, m.loadf64, NaN);