Implement Atomics API

test/mjsunit/asm/atomics-compareexchange.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 compareExchange = stdlib.Atomics.compareExchange;
+  var fround = stdlib.Math.fround;
+
+  function compareExchangei8(i, o, n) {
+    i = i | 0;
+    o = o | 0;
+    n = n | 0;
+    return compareExchange(MEM8, i, o, n)|0;
+  }
+
+  function compareExchangei16(i, o, n) {
+    i = i | 0;
+    o = o | 0;
+    n = n | 0;
+    return compareExchange(MEM16, i, o, n)|0;
+  }
+
+  function compareExchangei32(i, o, n) {
+    i = i | 0;
+    o = o | 0;
+    n = n | 0;
+    return compareExchange(MEM32, i, o, n)|0;
+  }
+
+  function compareExchangeu8(i, o, n) {
+    i = i | 0;
+    o = o >>> 0;
+    n = n >>> 0;
+    return compareExchange(MEMU8, i, o, n)>>>0;
+  }
+
+  function compareExchangeu16(i, o, n) {
+    i = i | 0;
+    o = o >>> 0;
+    n = n >>> 0;
+    return compareExchange(MEMU16, i, o, n)>>>0;
+  }
+
+  function compareExchangeu32(i, o, n) {
+    i = i | 0;
+    o = o >>> 0;
+    n = n >>> 0;
+    return compareExchange(MEMU32, i, o, n)>>>0;
+  }
+
+  function compareExchangef32(i, o, n) {
+    i = i | 0;
+    o = fround(o);
+    n = fround(n);
+    return fround(compareExchange(MEMF32, i, o, n));
+  }
+
+  function compareExchangef64(i, o, n) {
+    i = i | 0;
+    o = +o;
+    n = +n;
+    return +compareExchange(MEMF64, i, o, n);
+  }
+
+  return {
+    compareExchangei8: compareExchangei8,
+    compareExchangei16: compareExchangei16,
+    compareExchangei32: compareExchangei32,
+    compareExchangeu8: compareExchangeu8,
+    compareExchangeu16: compareExchangeu16,
+    compareExchangeu32: compareExchangeu32,
+    compareExchangef32: compareExchangef32,
+    compareExchangef64: compareExchangef64
+  };
+}
+
+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);
+  assertEquals(0, ta[0]);
+  assertEquals(0, f(0, 0, 50), name);
+  assertEquals(50, ta[0]);
+  // Value is not equal to 0, so compareExchange won't store 100
+  assertEquals(50, f(0, 0, 100), name);
+  assertEquals(50, ta[0]);
+  // out of bounds
+  assertEquals(oobValue, f(-1, 0, 0), name);
+  assertEquals(oobValue, f(ta.length, 0, 0), name);
+}
+
+testElementType(Int8Array, m.compareExchangei8, 0);
+testElementType(Int16Array, m.compareExchangei16, 0);
+testElementType(Int32Array, m.compareExchangei32, 0);
+testElementType(Uint8Array, m.compareExchangeu8, 0);
+testElementType(Uint16Array, m.compareExchangeu16, 0);
+testElementType(Uint32Array, m.compareExchangeu32, 0);
+testElementType(Float32Array, m.compareExchangef32, NaN);
+testElementType(Float64Array, m.compareExchangef64, NaN);