src/v8/src/runtime/runtime-atomics.cc - cobalt - Git at Google

 // 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/runtime/runtime-utils.h"

 #include "src/arguments.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/conversions-inl.h"
 #include "src/factory.h"

 // Implement Atomic accesses to SharedArrayBuffers as defined in the
 // SharedArrayBuffer draft spec, found here
 // https://github.com/tc39/ecmascript_sharedmem

 namespace v8 {
 namespace internal {

 namespace {

 #if V8_CC_GNU

 template <typename T>
 inline T ExchangeSeqCst(T* p, T value) {
   return __atomic_exchange_n(p, value, __ATOMIC_SEQ_CST);
 }

 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 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);
 }

 #elif V8_CC_MSVC

 #define InterlockedExchange32 _InterlockedExchange
 #define InterlockedCompareExchange32 _InterlockedCompareExchange
 #define InterlockedCompareExchange8 _InterlockedCompareExchange8
 #define InterlockedExchangeAdd32 _InterlockedExchangeAdd
 #define InterlockedExchangeAdd16 _InterlockedExchangeAdd16
 #define InterlockedExchangeAdd8 _InterlockedExchangeAdd8
 #define InterlockedAnd32 _InterlockedAnd
 #define InterlockedOr32 _InterlockedOr
 #define InterlockedXor32 _InterlockedXor

 #define ATOMIC_OPS(type, suffix, vctype)                                    \
   inline type ExchangeSeqCst(type* p, type value) {                         \
     return InterlockedExchange##suffix(reinterpret_cast<vctype*>(p),        \
                                        bit_cast<vctype>(value));            \
   }                                                                         \
   inline type CompareExchangeSeqCst(type* p, type oldval, type newval) {    \
     return InterlockedCompareExchange##suffix(reinterpret_cast<vctype*>(p), \
                                               bit_cast<vctype>(newval),     \
                                               bit_cast<vctype>(oldval));    \
   }                                                                         \
   inline type AddSeqCst(type* p, type value) {                              \
     return InterlockedExchangeAdd##suffix(reinterpret_cast<vctype*>(p),     \
                                           bit_cast<vctype>(value));         \
   }                                                                         \
   inline type SubSeqCst(type* p, type value) {                              \
     return InterlockedExchangeAdd##suffix(reinterpret_cast<vctype*>(p),     \
                                           -bit_cast<vctype>(value));        \
   }                                                                         \
   inline type AndSeqCst(type* p, type value) {                              \
     return InterlockedAnd##suffix(reinterpret_cast<vctype*>(p),             \
                                   bit_cast<vctype>(value));                 \
   }                                                                         \
   inline type OrSeqCst(type* p, type value) {                               \
     return InterlockedOr##suffix(reinterpret_cast<vctype*>(p),              \
                                  bit_cast<vctype>(value));                  \
   }                                                                         \
   inline type XorSeqCst(type* p, type value) {                              \
     return InterlockedXor##suffix(reinterpret_cast<vctype*>(p),             \
                                   bit_cast<vctype>(value));                 \
   }

 ATOMIC_OPS(int8_t, 8, char)
 ATOMIC_OPS(uint8_t, 8, char)
 ATOMIC_OPS(int16_t, 16, short)  /* NOLINT(runtime/int) */
 ATOMIC_OPS(uint16_t, 16, short) /* NOLINT(runtime/int) */
 ATOMIC_OPS(int32_t, 32, long)   /* NOLINT(runtime/int) */
 ATOMIC_OPS(uint32_t, 32, long)  /* NOLINT(runtime/int) */

 #undef ATOMIC_OPS_INTEGER
 #undef ATOMIC_OPS

 #undef InterlockedExchange32
 #undef InterlockedCompareExchange32
 #undef InterlockedCompareExchange8
 #undef InterlockedExchangeAdd32
 #undef InterlockedExchangeAdd16
 #undef InterlockedExchangeAdd8
 #undef InterlockedAnd32
 #undef InterlockedOr32
 #undef InterlockedXor32

 #else

 #error Unsupported platform!

 #endif

 template <typename T>
 T FromObject(Handle<Object> number);

 template <>
 inline uint8_t FromObject<uint8_t>(Handle<Object> number) {
   return NumberToUint32(*number);
 }

 template <>
 inline int8_t FromObject<int8_t>(Handle<Object> number) {
   return NumberToInt32(*number);
 }

 template <>
 inline uint16_t FromObject<uint16_t>(Handle<Object> number) {
   return NumberToUint32(*number);
 }

 template <>
 inline int16_t FromObject<int16_t>(Handle<Object> number) {
   return NumberToInt32(*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);
 }


 inline Object* ToObject(Isolate* isolate, int8_t t) { return Smi::FromInt(t); }

 inline Object* ToObject(Isolate* isolate, uint8_t t) { return Smi::FromInt(t); }

 inline Object* ToObject(Isolate* isolate, int16_t t) { return Smi::FromInt(t); }

 inline Object* ToObject(Isolate* isolate, uint16_t t) {
   return Smi::FromInt(t);
 }

 inline Object* ToObject(Isolate* isolate, int32_t t) {
   return *isolate->factory()->NewNumber(t);
 }

 inline Object* ToObject(Isolate* isolate, uint32_t t) {
   return *isolate->factory()->NewNumber(t);
 }

 template <typename T>
 inline Object* DoExchange(Isolate* isolate, void* buffer, size_t index,
                           Handle<Object> obj) {
   T value = FromObject<T>(obj);
   T result = ExchangeSeqCst(static_cast<T*>(buffer) + index, value);
   return ToObject(isolate, result);
 }

 template <typename T>
 inline Object* DoCompareExchange(Isolate* isolate, void* buffer, size_t index,
                                  Handle<Object> oldobj, Handle<Object> newobj) {
   T oldval = FromObject<T>(oldobj);
   T newval = FromObject<T>(newobj);
   T result =
       CompareExchangeSeqCst(static_cast<T*>(buffer) + index, oldval, newval);
   return ToObject(isolate, result);
 }

 template <typename T>
 inline Object* DoAdd(Isolate* isolate, void* buffer, size_t index,
                      Handle<Object> obj) {
   T value = FromObject<T>(obj);
   T result = AddSeqCst(static_cast<T*>(buffer) + index, value);
   return ToObject(isolate, result);
 }

 template <typename T>
 inline Object* DoSub(Isolate* isolate, void* buffer, size_t index,
                      Handle<Object> obj) {
   T value = FromObject<T>(obj);
   T result = SubSeqCst(static_cast<T*>(buffer) + index, value);
   return ToObject(isolate, result);
 }

 template <typename T>
 inline Object* DoAnd(Isolate* isolate, void* buffer, size_t index,
                      Handle<Object> obj) {
   T value = FromObject<T>(obj);
   T result = AndSeqCst(static_cast<T*>(buffer) + index, value);
   return ToObject(isolate, result);
 }

 template <typename T>
 inline Object* DoOr(Isolate* isolate, void* buffer, size_t index,
                     Handle<Object> obj) {
   T value = FromObject<T>(obj);
   T result = OrSeqCst(static_cast<T*>(buffer) + index, value);
   return ToObject(isolate, result);
 }

 template <typename T>
 inline Object* DoXor(Isolate* isolate, void* buffer, size_t index,
                      Handle<Object> obj) {
   T value = FromObject<T>(obj);
   T result = XorSeqCst(static_cast<T*>(buffer) + index, value);
   return ToObject(isolate, 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)

 RUNTIME_FUNCTION(Runtime_ThrowNotIntegerSharedTypedArrayError) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate,
       NewTypeError(MessageTemplate::kNotIntegerSharedTypedArray, value));
 }

 RUNTIME_FUNCTION(Runtime_ThrowNotInt32SharedTypedArrayError) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewTypeError(MessageTemplate::kNotInt32SharedTypedArray, value));
 }

 RUNTIME_FUNCTION(Runtime_ThrowInvalidAtomicAccessIndexError) {
   HandleScope scope(isolate);
   DCHECK_EQ(0, args.length());
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewRangeError(MessageTemplate::kInvalidAtomicAccessIndex));
 }

 RUNTIME_FUNCTION(Runtime_AtomicsExchange) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoExchange<ctype>(isolate, source, index, value);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 RUNTIME_FUNCTION(Runtime_AtomicsCompareExchange) {
   HandleScope scope(isolate);
   DCHECK_EQ(4, args.length());
   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);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoCompareExchange<ctype>(isolate, source, index, oldobj, newobj);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 // ES #sec-atomics.add
 // Atomics.add( typedArray, index, value )
 RUNTIME_FUNCTION(Runtime_AtomicsAdd) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoAdd<ctype>(isolate, source, index, value);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 // ES #sec-atomics.sub
 // Atomics.sub( typedArray, index, value )
 RUNTIME_FUNCTION(Runtime_AtomicsSub) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoSub<ctype>(isolate, source, index, value);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 // ES #sec-atomics.and
 // Atomics.and( typedArray, index, value )
 RUNTIME_FUNCTION(Runtime_AtomicsAnd) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoAnd<ctype>(isolate, source, index, value);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 // ES #sec-atomics.or
 // Atomics.or( typedArray, index, value )
 RUNTIME_FUNCTION(Runtime_AtomicsOr) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoOr<ctype>(isolate, source, index, value);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 // ES #sec-atomics.xor
 // Atomics.xor( typedArray, index, value )
 RUNTIME_FUNCTION(Runtime_AtomicsXor) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
   CONVERT_SIZE_ARG_CHECKED(index, 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
   CHECK(sta->GetBuffer()->is_shared());
   CHECK_LT(index, NumberToSize(sta->length()));

   uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
                     NumberToSize(sta->byte_offset());

   switch (sta->type()) {
 #define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
   case kExternal##Type##Array:                              \
     return DoXor<ctype>(isolate, source, index, value);

     INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE

     default:
       break;
   }

   UNREACHABLE();
 }

 }  // namespace internal
 }  // namespace v8
	// 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/runtime/runtime-utils.h"

	#include "src/arguments.h"
	#include "src/base/macros.h"
	#include "src/base/platform/mutex.h"
	#include "src/conversions-inl.h"
	#include "src/factory.h"

	// Implement Atomic accesses to SharedArrayBuffers as defined in the
	// SharedArrayBuffer draft spec, found here
	// https://github.com/tc39/ecmascript_sharedmem

	namespace v8 {
	namespace internal {

	namespace {

	#if V8_CC_GNU

	template <typename T>
	inline T ExchangeSeqCst(T* p, T value) {
	return __atomic_exchange_n(p, value, __ATOMIC_SEQ_CST);
	}

	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 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);
	}

	#elif V8_CC_MSVC

	#define InterlockedExchange32 _InterlockedExchange
	#define InterlockedCompareExchange32 _InterlockedCompareExchange
	#define InterlockedCompareExchange8 _InterlockedCompareExchange8
	#define InterlockedExchangeAdd32 _InterlockedExchangeAdd
	#define InterlockedExchangeAdd16 _InterlockedExchangeAdd16
	#define InterlockedExchangeAdd8 _InterlockedExchangeAdd8
	#define InterlockedAnd32 _InterlockedAnd
	#define InterlockedOr32 _InterlockedOr
	#define InterlockedXor32 _InterlockedXor

	#define ATOMIC_OPS(type, suffix, vctype) \
	inline type ExchangeSeqCst(type* p, type value) { \
	return InterlockedExchange##suffix(reinterpret_cast<vctype*>(p), \
	bit_cast<vctype>(value)); \
	} \
	inline type CompareExchangeSeqCst(type* p, type oldval, type newval) { \
	return InterlockedCompareExchange##suffix(reinterpret_cast<vctype*>(p), \
	bit_cast<vctype>(newval), \
	bit_cast<vctype>(oldval)); \
	} \
	inline type AddSeqCst(type* p, type value) { \
	return InterlockedExchangeAdd##suffix(reinterpret_cast<vctype*>(p), \
	bit_cast<vctype>(value)); \
	} \
	inline type SubSeqCst(type* p, type value) { \
	return InterlockedExchangeAdd##suffix(reinterpret_cast<vctype*>(p), \
	-bit_cast<vctype>(value)); \
	} \
	inline type AndSeqCst(type* p, type value) { \
	return InterlockedAnd##suffix(reinterpret_cast<vctype*>(p), \
	bit_cast<vctype>(value)); \
	} \
	inline type OrSeqCst(type* p, type value) { \
	return InterlockedOr##suffix(reinterpret_cast<vctype*>(p), \
	bit_cast<vctype>(value)); \
	} \
	inline type XorSeqCst(type* p, type value) { \
	return InterlockedXor##suffix(reinterpret_cast<vctype*>(p), \
	bit_cast<vctype>(value)); \
	}

	ATOMIC_OPS(int8_t, 8, char)
	ATOMIC_OPS(uint8_t, 8, char)
	ATOMIC_OPS(int16_t, 16, short) /* NOLINT(runtime/int) */
	ATOMIC_OPS(uint16_t, 16, short) /* NOLINT(runtime/int) */
	ATOMIC_OPS(int32_t, 32, long) /* NOLINT(runtime/int) */
	ATOMIC_OPS(uint32_t, 32, long) /* NOLINT(runtime/int) */

	#undef ATOMIC_OPS_INTEGER
	#undef ATOMIC_OPS

	#undef InterlockedExchange32
	#undef InterlockedCompareExchange32
	#undef InterlockedCompareExchange8
	#undef InterlockedExchangeAdd32
	#undef InterlockedExchangeAdd16
	#undef InterlockedExchangeAdd8
	#undef InterlockedAnd32
	#undef InterlockedOr32
	#undef InterlockedXor32

	#else

	#error Unsupported platform!

	#endif

	template <typename T>
	T FromObject(Handle<Object> number);

	template <>
	inline uint8_t FromObject<uint8_t>(Handle<Object> number) {
	return NumberToUint32(*number);
	}

	template <>
	inline int8_t FromObject<int8_t>(Handle<Object> number) {
	return NumberToInt32(*number);
	}

	template <>
	inline uint16_t FromObject<uint16_t>(Handle<Object> number) {
	return NumberToUint32(*number);
	}

	template <>
	inline int16_t FromObject<int16_t>(Handle<Object> number) {
	return NumberToInt32(*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);
	}


	inline Object* ToObject(Isolate* isolate, int8_t t) { return Smi::FromInt(t); }

	inline Object* ToObject(Isolate* isolate, uint8_t t) { return Smi::FromInt(t); }

	inline Object* ToObject(Isolate* isolate, int16_t t) { return Smi::FromInt(t); }

	inline Object* ToObject(Isolate* isolate, uint16_t t) {
	return Smi::FromInt(t);
	}

	inline Object* ToObject(Isolate* isolate, int32_t t) {
	return *isolate->factory()->NewNumber(t);
	}

	inline Object* ToObject(Isolate* isolate, uint32_t t) {
	return *isolate->factory()->NewNumber(t);
	}

	template <typename T>
	inline Object* DoExchange(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> obj) {
	T value = FromObject<T>(obj);
	T result = ExchangeSeqCst(static_cast<T*>(buffer) + index, value);
	return ToObject(isolate, result);
	}

	template <typename T>
	inline Object* DoCompareExchange(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> oldobj, Handle<Object> newobj) {
	T oldval = FromObject<T>(oldobj);
	T newval = FromObject<T>(newobj);
	T result =
	CompareExchangeSeqCst(static_cast<T*>(buffer) + index, oldval, newval);
	return ToObject(isolate, result);
	}

	template <typename T>
	inline Object* DoAdd(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> obj) {
	T value = FromObject<T>(obj);
	T result = AddSeqCst(static_cast<T*>(buffer) + index, value);
	return ToObject(isolate, result);
	}

	template <typename T>
	inline Object* DoSub(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> obj) {
	T value = FromObject<T>(obj);
	T result = SubSeqCst(static_cast<T*>(buffer) + index, value);
	return ToObject(isolate, result);
	}

	template <typename T>
	inline Object* DoAnd(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> obj) {
	T value = FromObject<T>(obj);
	T result = AndSeqCst(static_cast<T*>(buffer) + index, value);
	return ToObject(isolate, result);
	}

	template <typename T>
	inline Object* DoOr(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> obj) {
	T value = FromObject<T>(obj);
	T result = OrSeqCst(static_cast<T*>(buffer) + index, value);
	return ToObject(isolate, result);
	}

	template <typename T>
	inline Object* DoXor(Isolate* isolate, void* buffer, size_t index,
	Handle<Object> obj) {
	T value = FromObject<T>(obj);
	T result = XorSeqCst(static_cast<T*>(buffer) + index, value);
	return ToObject(isolate, 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)

	RUNTIME_FUNCTION(Runtime_ThrowNotIntegerSharedTypedArrayError) {
	HandleScope scope(isolate);
	DCHECK_EQ(1, args.length());
	CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
	THROW_NEW_ERROR_RETURN_FAILURE(
	isolate,
	NewTypeError(MessageTemplate::kNotIntegerSharedTypedArray, value));
	}

	RUNTIME_FUNCTION(Runtime_ThrowNotInt32SharedTypedArrayError) {
	HandleScope scope(isolate);
	DCHECK_EQ(1, args.length());
	CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
	THROW_NEW_ERROR_RETURN_FAILURE(
	isolate, NewTypeError(MessageTemplate::kNotInt32SharedTypedArray, value));
	}

	RUNTIME_FUNCTION(Runtime_ThrowInvalidAtomicAccessIndexError) {
	HandleScope scope(isolate);
	DCHECK_EQ(0, args.length());
	THROW_NEW_ERROR_RETURN_FAILURE(
	isolate, NewRangeError(MessageTemplate::kInvalidAtomicAccessIndex));
	}

	RUNTIME_FUNCTION(Runtime_AtomicsExchange) {
	HandleScope scope(isolate);
	DCHECK_EQ(3, args.length());
	CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
	CONVERT_SIZE_ARG_CHECKED(index, 1);
	CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoExchange<ctype>(isolate, source, index, value);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	RUNTIME_FUNCTION(Runtime_AtomicsCompareExchange) {
	HandleScope scope(isolate);
	DCHECK_EQ(4, args.length());
	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);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoCompareExchange<ctype>(isolate, source, index, oldobj, newobj);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	// ES #sec-atomics.add
	// Atomics.add( typedArray, index, value )
	RUNTIME_FUNCTION(Runtime_AtomicsAdd) {
	HandleScope scope(isolate);
	DCHECK_EQ(3, args.length());
	CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
	CONVERT_SIZE_ARG_CHECKED(index, 1);
	CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoAdd<ctype>(isolate, source, index, value);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	// ES #sec-atomics.sub
	// Atomics.sub( typedArray, index, value )
	RUNTIME_FUNCTION(Runtime_AtomicsSub) {
	HandleScope scope(isolate);
	DCHECK_EQ(3, args.length());
	CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
	CONVERT_SIZE_ARG_CHECKED(index, 1);
	CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoSub<ctype>(isolate, source, index, value);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	// ES #sec-atomics.and
	// Atomics.and( typedArray, index, value )
	RUNTIME_FUNCTION(Runtime_AtomicsAnd) {
	HandleScope scope(isolate);
	DCHECK_EQ(3, args.length());
	CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
	CONVERT_SIZE_ARG_CHECKED(index, 1);
	CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoAnd<ctype>(isolate, source, index, value);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	// ES #sec-atomics.or
	// Atomics.or( typedArray, index, value )
	RUNTIME_FUNCTION(Runtime_AtomicsOr) {
	HandleScope scope(isolate);
	DCHECK_EQ(3, args.length());
	CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
	CONVERT_SIZE_ARG_CHECKED(index, 1);
	CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoOr<ctype>(isolate, source, index, value);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	// ES #sec-atomics.xor
	// Atomics.xor( typedArray, index, value )
	RUNTIME_FUNCTION(Runtime_AtomicsXor) {
	HandleScope scope(isolate);
	DCHECK_EQ(3, args.length());
	CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
	CONVERT_SIZE_ARG_CHECKED(index, 1);
	CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2);
	CHECK(sta->GetBuffer()->is_shared());
	CHECK_LT(index, NumberToSize(sta->length()));

	uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
	NumberToSize(sta->byte_offset());

	switch (sta->type()) {
	#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
	case kExternal##Type##Array: \
	return DoXor<ctype>(isolate, source, index, value);

	INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
	#undef TYPED_ARRAY_CASE

	default:
	break;
	}

	UNREACHABLE();
	}

	} // namespace internal
	} // namespace v8