Implement Atomics API

src/runtime/runtime-atomics.cc

+// 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.
+
+#include "src/v8.h"
+
+#include "src/arguments.h"
+#include "src/base/macros.h"
+#include "src/base/platform/mutex.h"
+#include "src/conversions.h"
+#include "src/runtime/runtime-utils.h"
+
+// Implement Atomic accesses to SharedArrayBuffers as defined in the
+// SharedArrayBuffer draft spec, found here
+// https://docs.google.com/document/d/1NDGA_gZJ7M7w1Bh8S0AoDyEqwDdRh4uSoTPSNn77PFk
+
+namespace v8 {
+namespace internal {
+
+namespace {
+
+#if V8_CC_GNU
+
+template <typename T>
+inline T CompareExchangeSeqCst(T* p, T oldval, T newval) {
+  (void)__atomic_compare_exchange_n(p, &oldval, newval, 0, __ATOMIC_SEQ_CST,
+                                    __ATOMIC_SEQ_CST);
+  return oldval;
+}
+
+template <typename T>
+inline T LoadSeqCst(T* p) {
+  T result;
+  __atomic_load(p, &result, __ATOMIC_SEQ_CST);
+  return result;
+}
+
+template <typename T>
+inline void StoreSeqCst(T* p, T value) {
+  __atomic_store_n(p, value, __ATOMIC_SEQ_CST);
+}
+
+template <typename T>
+inline T AddSeqCst(T* p, T value) {
+  return __atomic_fetch_add(p, value, __ATOMIC_SEQ_CST);
+}
+
+template <typename T>
+inline T SubSeqCst(T* p, T value) {
+  return __atomic_fetch_sub(p, value, __ATOMIC_SEQ_CST);
+}
+
+template <typename T>
+inline T AndSeqCst(T* p, T value) {
+  return __atomic_fetch_and(p, value, __ATOMIC_SEQ_CST);
+}
+
+template <typename T>
+inline T OrSeqCst(T* p, T value) {
+  return __atomic_fetch_or(p, value, __ATOMIC_SEQ_CST);
+}
+
+template <typename T>
+inline T XorSeqCst(T* p, T value) {
+  return __atomic_fetch_xor(p, value, __ATOMIC_SEQ_CST);
+}
+
+template <typename T>
+inline T ExchangeSeqCst(T* p, T value) {
+  return __atomic_exchange_n(p, value, __ATOMIC_SEQ_CST);
+}
+
+#if ATOMICS_REQUIRE_LOCK_64_BIT
+
+// We only need to implement the following functions, because the rest of the
+// atomic operations only work on integer types, and the only 64-bit type is
+// float64. Similarly, because the values are being bit_cast from double ->
+// uint64_t, we don't need to implement these functions for int64_t either.
+
+static base::LazyMutex atomic_mutex = LAZY_MUTEX_INITIALIZER;
+
+inline uint64_t CompareExchangeSeqCst(uint64_t* p, uint64_t oldval,
+                                      uint64_t newval) {
+  base::LockGuard<base::Mutex> lock_guard(atomic_mutex.Pointer());
+  uint64_t result = *p;
+  if (result == oldval) *p = newval;
+  return result;
+}
+
+
+inline uint64_t LoadSeqCst(uint64_t* p) {
+  base::LockGuard<base::Mutex> lock_guard(atomic_mutex.Pointer());
+  return *p;
+}
+
+
+inline void StoreSeqCst(uint64_t* p, uint64_t value) {
+  base::LockGuard<base::Mutex> lock_guard(atomic_mutex.Pointer());
+  *p = value;
+}
+
+#endif  // ATOMICS_REQUIRE_LOCK_64_BIT
+
+#elif V8_CC_MSVC
+
+#define _InterlockedCompareExchange32 _InterlockedCompareExchange
+#define _InterlockedExchange32 _InterlockedExchange
+#define _InterlockedExchangeAdd32 _InterlockedExchangeAdd
+#define _InterlockedAnd32 _InterlockedAnd
+#define _InterlockedOr32 _InterlockedOr
+#define _InterlockedXor32 _InterlockedXor
+
+#define INTEGER_TYPES(V)                           \
+  V(int8_t, 8, char)                               \
+  V(uint8_t, 8, char)                              \
+  V(int16_t, 16, short)  /* NOLINT(runtime/int) */ \
+  V(uint16_t, 16, short) /* NOLINT(runtime/int) */ \
+  V(int32_t, 32, long)   /* NOLINT(runtime/int) */ \
+  V(uint32_t, 32, long)  /* NOLINT(runtime/int) */ \
+  V(int64_t, 64, LONGLONG)                         \
+  V(uint64_t, 64, LONGLONG)
+
+#define ATOMIC_OPS(type, suffix, vctype)                                       \
+  inline type CompareExchangeSeqCst(volatile type* p, type oldval,             \
+                                    type newval) {                             \
+    return _InterlockedCompareExchange##suffix(                                \
+        reinterpret_cast<volatile vctype*>(p), bit_cast<vctype>(newval),       \
+        bit_cast<vctype>(oldval));                                             \
+  }                                                                            \
+  inline type LoadSeqCst(volatile type* p) { return *p; }                      \
+  inline void StoreSeqCst(volatile type* p, type value) {                      \
+    _InterlockedExchange##suffix(reinterpret_cast<volatile vctype*>(p),        \
+                                 bit_cast<vctype>(value));                     \
+  }                                                                            \
+  inline type AddSeqCst(volatile type* p, type value) {                        \
+    return _InterlockedExchangeAdd##suffix(                                    \
+        reinterpret_cast<volatile vctype*>(p), bit_cast<vctype>(value));       \
+  }                                                                            \
+  inline type SubSeqCst(volatile type* p, type value) {                        \
+    return _InterlockedExchangeAdd##suffix(                                    \
+        reinterpret_cast<volatile vctype*>(p), -bit_cast<vctype>(value));      \
+  }                                                                            \
+  inline type AndSeqCst(volatile type* p, type value) {                        \
+    return _InterlockedAnd##suffix(reinterpret_cast<volatile vctype*>(p),      \
+                                   bit_cast<vctype>(value));                   \
+  }                                                                            \
+  inline type OrSeqCst(volatile type* p, type value) {                         \
+    return _InterlockedOr##suffix(reinterpret_cast<volatile vctype*>(p),       \
+                                  bit_cast<vctype>(value));                    \
+  }                                                                            \
+  inline type XorSeqCst(volatile type* p, type value) {                        \
+    return _InterlockedXor##suffix(reinterpret_cast<volatile vctype*>(p),      \
+                                   bit_cast<vctype>(value));                   \
+  }                                                                            \
+  inline type ExchangeSeqCst(volatile type* p, type value) {                   \
+    return _InterlockedExchange##suffix(reinterpret_cast<volatile vctype*>(p), \
+                                        bit_cast<vctype>(value));              \
+  }
+INTEGER_TYPES(ATOMIC_OPS)
+#undef ATOMIC_OPS
+
+#undef INTEGER_TYPES
+#undef _InterlockedCompareExchange32
+#undef _InterlockedExchange32
+#undef _InterlockedExchangeAdd32
+#undef _InterlockedAnd32
+#undef _InterlockedOr32
+#undef _InterlockedXor32
+
+#else
+
+#error Unsupported platform!
+
+#endif
+
+template <typename T>
+T FromObject(Handle<Object> number);
+
+template <>
+inline uint32_t FromObject<uint32_t>(Handle<Object> number) {
+  return NumberToUint32(*number);
+}
+
+template <>
+inline int32_t FromObject<int32_t>(Handle<Object> number) {
+  return NumberToInt32(*number);
+}
+
+template <>
+inline float FromObject<float>(Handle<Object> number) {
+  return static_cast<float>(number->Number());
+}
+
+template <>
+inline double FromObject<double>(Handle<Object> number) {
+  return number->Number();
+}
+
+template <typename T, typename F>
+inline T ToAtomic(F from) {
+  return static_cast<T>(from);
+}
+
+template <>
+inline uint32_t ToAtomic<uint32_t, float>(float from) {
+  return bit_cast<uint32_t, float>(from);
+}
+
+template <>
+inline uint64_t ToAtomic<uint64_t, double>(double from) {
+  return bit_cast<uint64_t, double>(from);
+}
+
+template <typename T, typename F>
+inline T FromAtomic(F from) {
+  return static_cast<T>(from);
+}
+
+template <>
+inline float FromAtomic<float, uint32_t>(uint32_t from) {
+  return bit_cast<float, uint32_t>(from);
+}
+
+template <>
+inline double FromAtomic<double, uint64_t>(uint64_t from) {
+  return bit_cast<double, uint64_t>(from);
+}
+
+template <typename T>
+inline Object* ToObject(Isolate* isolate, T t);
+
+template <>
+inline Object* ToObject<int8_t>(Isolate* isolate, int8_t t) {
+  return Smi::FromInt(t);
+}
+
+template <>
+inline Object* ToObject<uint8_t>(Isolate* isolate, uint8_t t) {
+  return Smi::FromInt(t);
+}
+
+template <>
+inline Object* ToObject<int16_t>(Isolate* isolate, int16_t t) {
+  return Smi::FromInt(t);
+}
+
+template <>
+inline Object* ToObject<uint16_t>(Isolate* isolate, uint16_t t) {
+  return Smi::FromInt(t);
+}
+
+template <>
+inline Object* ToObject<int32_t>(Isolate* isolate, int32_t t) {
+  return *isolate->factory()->NewNumber(t);
+}
+
+template <>
+inline Object* ToObject<uint32_t>(Isolate* isolate, uint32_t t) {
+  return *isolate->factory()->NewNumber(t);
+}
+
+template <>
+inline Object* ToObject<float>(Isolate* isolate, float t) {
+  return *isolate->factory()->NewNumber(t);
+}
+
+template <>
+inline Object* ToObject<double>(Isolate* isolate, double t) {
+  return *isolate->factory()->NewNumber(t);
+}
+
+template <typename T>
+struct FromObjectTraits {};
+
+template <>
+struct FromObjectTraits<int8_t> {
+  typedef int32_t convert_type;
+  typedef int8_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<uint8_t> {
+  typedef uint32_t convert_type;
+  typedef uint8_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<int16_t> {
+  typedef int32_t convert_type;
+  typedef int16_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<uint16_t> {
+  typedef uint32_t convert_type;
+  typedef uint16_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<int32_t> {
+  typedef int32_t convert_type;
+  typedef int32_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<uint32_t> {
+  typedef uint32_t convert_type;
+  typedef uint32_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<float> {
+  typedef float convert_type;
+  typedef uint32_t atomic_type;
+};
+
+template <>
+struct FromObjectTraits<double> {
+  typedef double convert_type;
+  typedef uint64_t atomic_type;
+};
+
+
+template <typename T>
+inline Object* DoCompareExchange(Isolate* isolate, void* buffer, size_t index,
+                                 Handle<Object> oldobj, Handle<Object> newobj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type oldval = ToAtomic<atomic_type>(FromObject<convert_type>(oldobj));
+  atomic_type newval = ToAtomic<atomic_type>(FromObject<convert_type>(newobj));
+  atomic_type result = CompareExchangeSeqCst(
+      static_cast<atomic_type*>(buffer) + index, oldval, newval);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoLoad(Isolate* isolate, void* buffer, size_t index) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  atomic_type result = LoadSeqCst(static_cast<atomic_type*>(buffer) + index);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoStore(Isolate* isolate, void* buffer, size_t index,
+                       Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  StoreSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return *obj;
+}
+
+
+template <typename T>
+inline Object* DoAdd(Isolate* isolate, void* buffer, size_t index,
+                     Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  atomic_type result =
+      AddSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoSub(Isolate* isolate, void* buffer, size_t index,
+                     Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  atomic_type result =
+      SubSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoAnd(Isolate* isolate, void* buffer, size_t index,
+                     Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  atomic_type result =
+      AndSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoOr(Isolate* isolate, void* buffer, size_t index,
+                    Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  atomic_type result =
+      OrSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoXor(Isolate* isolate, void* buffer, size_t index,
+                     Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  atomic_type result =
+      XorSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+
+template <typename T>
+inline Object* DoExchange(Isolate* isolate, void* buffer, size_t index,
+                          Handle<Object> obj) {
+  typedef typename FromObjectTraits<T>::atomic_type atomic_type;
+  typedef typename FromObjectTraits<T>::convert_type convert_type;
+  atomic_type value = ToAtomic<atomic_type>(FromObject<convert_type>(obj));
+  atomic_type result =
+      ExchangeSeqCst(static_cast<atomic_type*>(buffer) + index, value);
+  return ToObject<T>(isolate, FromAtomic<T>(result));
+}
+
+}  // anonymous namespace
+
+// Duplicated from objects.h
+// V has parameters (Type, type, TYPE, C type, element_size)
+#define INTEGER_TYPED_ARRAYS(V)          \
+  V(Uint8, uint8, UINT8, uint8_t, 1)     \
+  V(Int8, int8, INT8, int8_t, 1)         \
+  V(Uint16, uint16, UINT16, uint16_t, 2) \
+  V(Int16, int16, INT16, int16_t, 2)     \
+  V(Uint32, uint32, UINT32, uint32_t, 4) \
+  V(Int32, int32, INT32, int32_t, 4)     \
+  V(Uint8Clamped, uint8_clamped, UINT8_CLAMPED, uint8_t, 1)
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsCompareExchange) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(oldobj, 2);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(newobj, 3);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoCompareExchange<ctype>(isolate, buffer, index, oldobj, newobj);
+
+    TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsLoad) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoLoad<ctype>(isolate, buffer, index);
+
+    TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsStore) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoStore<ctype>(isolate, buffer, index, value);
+
+    TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsAdd) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoAdd<ctype>(isolate, buffer, index, value);
+
+    INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    case kExternalFloat32Array:
+    case kExternalFloat64Array:
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsSub) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoSub<ctype>(isolate, buffer, index, value);
+
+    INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    case kExternalFloat32Array:
+    case kExternalFloat64Array:
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsAnd) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoAnd<ctype>(isolate, buffer, index, value);
+
+    INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    case kExternalFloat32Array:
+    case kExternalFloat64Array:
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsOr) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoOr<ctype>(isolate, buffer, index, value);
+
+    INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    case kExternalFloat32Array:
+    case kExternalFloat64Array:
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsXor) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoXor<ctype>(isolate, buffer, index, value);
+
+    INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    case kExternalFloat32Array:
+    case kExternalFloat64Array:
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsExchange) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
+  CONVERT_SIZE_ARG_CHECKED(index, 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
+  DCHECK(sta->GetBuffer()->is_shared());
+  DCHECK(index < NumberToSize(isolate, sta->length()));
+
+  void* buffer = sta->GetBuffer()->backing_store();
+
+  switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+  case kExternal##Type##Array:                              \
+    return DoExchange<ctype>(isolate, buffer, index, value);
+
+    INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+    case kExternalFloat32Array:
+    case kExternalFloat64Array:
+    default:
+      break;
+  }
+
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_AtomicsIsLockFree) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_NUMBER_ARG_HANDLE_CHECKED(size, 0);
+  uint32_t usize = NumberToUint32(*size);
+
+  return Runtime::AtomicIsLockFree(usize) ? isolate->heap()->true_value()
+                                          : isolate->heap()->false_value();
+}
+}
+}  // namespace v8::internal