Revert "[SAB] Move Atomics builtins to C++"

src/js/harmony-atomics.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.
+
+(function(global, utils) {
+
+"use strict";
+
+%CheckIsBootstrapping();
+
+// -------------------------------------------------------------------
+// Imports
+
+var GlobalObject = global.Object;
+var MaxSimple;
+var MinSimple;
+var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
+
+utils.Import(function(from) {
+  MaxSimple = from.MaxSimple;
+  MinSimple = from.MinSimple;
+});
+
+// -------------------------------------------------------------------
+
+
+function CheckSharedIntegerTypedArray(ia) {
+  if (!%IsSharedIntegerTypedArray(ia)) {
+    throw %make_type_error(kNotIntegerSharedTypedArray, ia);
+  }
+}
+
+function CheckSharedInteger32TypedArray(ia) {
+  CheckSharedIntegerTypedArray(ia);
+  if (!%IsSharedInteger32TypedArray(ia)) {
+    throw %make_type_error(kNotInt32SharedTypedArray, ia);
+  }
+}
+
+// https://tc39.github.io/ecmascript_sharedmem/shmem.html#Atomics.ValidateAtomicAccess
+function ValidateIndex(index, length) {
+  var numberIndex = TO_NUMBER(index);
+  var accessIndex = TO_INTEGER(numberIndex);
+  if (numberIndex !== accessIndex) {
+    throw %make_range_error(kInvalidAtomicAccessIndex);
+  }
+  if (accessIndex < 0 || accessIndex >= length) {
+    throw %make_range_error(kInvalidAtomicAccessIndex);
+  }
+  return accessIndex;
+}
+
+//-------------------------------------------------------------------
+
+function AtomicsCompareExchangeJS(sta, index, oldValue, newValue) {
+  CheckSharedIntegerTypedArray(sta);
+  index = ValidateIndex(index, %_TypedArrayGetLength(sta));
+  oldValue = TO_NUMBER(oldValue);
+  newValue = TO_NUMBER(newValue);
+  return %_AtomicsCompareExchange(sta, index, oldValue, newValue);
+}
+
+function AtomicsAddJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  value = TO_NUMBER(value);
+  return %_AtomicsAdd(ia, index, value);
+}
+
+function AtomicsSubJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  value = TO_NUMBER(value);
+  return %_AtomicsSub(ia, index, value);
+}
+
+function AtomicsAndJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  value = TO_NUMBER(value);
+  return %_AtomicsAnd(ia, index, value);
+}
+
+function AtomicsOrJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  value = TO_NUMBER(value);
+  return %_AtomicsOr(ia, index, value);
+}
+
+function AtomicsXorJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  value = TO_NUMBER(value);
+  return %_AtomicsXor(ia, index, value);
+}
+
+function AtomicsExchangeJS(ia, index, value) {
+  CheckSharedIntegerTypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  value = TO_NUMBER(value);
+  return %_AtomicsExchange(ia, index, value);
+}
+
+function AtomicsIsLockFreeJS(size) {
+  return %_AtomicsIsLockFree(TO_INTEGER(size));
+}
+
+function AtomicsWaitJS(ia, index, value, timeout) {
+  CheckSharedInteger32TypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  if (IS_UNDEFINED(timeout)) {
+    timeout = INFINITY;
+  } else {
+    timeout = TO_NUMBER(timeout);
+    if (NUMBER_IS_NAN(timeout)) {
+      timeout = INFINITY;
+    } else {
+      timeout = MaxSimple(0, timeout);
+    }
+  }
+  return %AtomicsWait(ia, index, value, timeout);
+}
+
+function AtomicsWakeJS(ia, index, count) {
+  CheckSharedInteger32TypedArray(ia);
+  index = ValidateIndex(index, %_TypedArrayGetLength(ia));
+  if (IS_UNDEFINED(count)) {
+    count = kMaxUint32;
+  } else {
+    // Clamp to [0, kMaxUint32].
+    count = MinSimple(MaxSimple(0, TO_INTEGER(count)), kMaxUint32);
+  }
+  return %AtomicsWake(ia, index, count);
+}
+
+// -------------------------------------------------------------------
+
+var Atomics = global.Atomics;
+
+// The Atomics global is defined by the bootstrapper.
+
+%AddNamedProperty(Atomics, toStringTagSymbol, "Atomics", READ_ONLY | DONT_ENUM);
+
+utils.InstallFunctions(Atomics, DONT_ENUM, [
+  // TODO(binji): remove the rest of the (non futex) Atomics functions as they
+  // become builtins.
+  "compareExchange", AtomicsCompareExchangeJS,
+  "add", AtomicsAddJS,
+  "sub", AtomicsSubJS,
+  "and", AtomicsAndJS,
+  "or", AtomicsOrJS,
+  "xor", AtomicsXorJS,
+  "exchange", AtomicsExchangeJS,
+  "isLockFree", AtomicsIsLockFreeJS,
+  "wait", AtomicsWaitJS,
+  "wake", AtomicsWakeJS,
+]);
+
+})