Implement Atomics API

src/harmony-atomics.js

Index: src/harmony-atomics.js
diff --git a/src/harmony-atomics.js b/src/harmony-atomics.js
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+++ b/src/harmony-atomics.js
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+// 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.
+
+(function(global, utils) {
+
+"use strict";
+
+%CheckIsBootstrapping();
+
+// -------------------------------------------------------------------
+// Imports
+
+var GlobalObject = global.Object;
+
+// -------------------------------------------------------------------
+
+
+function CheckSharedTypedArray(sta) {
+  if (!%_IsSharedTypedArray(sta)) {
+    throw MakeTypeError(kNotSharedTypedArray, sta);
+  }
+}
+
+function CheckSharedIntegerTypedArray(ia) {
+  if (!%_IsSharedIntegerTypedArray(ia)) {
+    throw MakeTypeError(kNotIntegerSharedTypedArray, ia);
+  }
+}
+
+//-------------------------------------------------------------------
+
+function AtomicsCompareExchangeJS(sta, index, oldValue, newValue) {
+  CheckSharedTypedArray(sta);
+  index = $toInteger(index);
+  if (index < 0 || index >= sta.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsCompareExchange(sta, index, oldValue, newValue);
+}
+
+function AtomicsLoadJS(sta, index) {
+  CheckSharedTypedArray(sta);
+  index = $toInteger(index);
+  if (index < 0 || index >= sta.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsLoad(sta, index);
+}
+
+function AtomicsStoreJS(sta, index, value) {
+  CheckSharedTypedArray(sta);
+  index = $toInteger(index);
+  if (index < 0 || index >= sta.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsStore(sta, index, value);
+}
+
+function AtomicsAddJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = $toInteger(index);
+  if (index < 0 || index >= ia.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsAdd(ia, index, value);
+}
+
+function AtomicsSubJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = $toInteger(index);
+  if (index < 0 || index >= ia.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsSub(ia, index, value);
+}
+
+function AtomicsAndJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = $toInteger(index);
+  if (index < 0 || index >= ia.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsAnd(ia, index, value);
+}
+
+function AtomicsOrJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = $toInteger(index);
+  if (index < 0 || index >= ia.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsOr(ia, index, value);
+}
+
+function AtomicsXorJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = $toInteger(index);
+  if (index < 0 || index >= ia.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsXor(ia, index, value);
+}
+
+function AtomicsExchangeJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = $toInteger(index);
+  if (index < 0 || index >= ia.length) {
+    return UNDEFINED;
+  }
+  return %_AtomicsExchange(ia, index, value);
+}
+
+function AtomicsIsLockFreeJS(size) {
+  return %_AtomicsIsLockFree(size);
+}
+
+// -------------------------------------------------------------------
+
+function AtomicsConstructor() {}
+
+var Atomics = new AtomicsConstructor();
+
+%InternalSetPrototype(Atomics, GlobalObject.prototype);
+%AddNamedProperty(global, "Atomics", Atomics, DONT_ENUM);
+%FunctionSetInstanceClassName(AtomicsConstructor, 'Atomics');
+
+%AddNamedProperty(Atomics, symbolToStringTag, "Atomics", READ_ONLY | DONT_ENUM);
+
+utils.InstallFunctions(Atomics, DONT_ENUM, [
+  "compareExchange", AtomicsCompareExchangeJS,
+  "load", AtomicsLoadJS,
+  "store", AtomicsStoreJS,
+  "add", AtomicsAddJS,
+  "sub", AtomicsSubJS,
+  "and", AtomicsAndJS,
+  "or", AtomicsOrJS,
+  "xor", AtomicsXorJS,
+  "exchange", AtomicsExchangeJS,
+  "isLockFree", AtomicsIsLockFreeJS,
+]);
+
+})