Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/runtime/runtime-atomics.cc b/src/runtime/runtime-atomics.cc
new file mode 100644
index 0000000..94d98d4
--- /dev/null
+++ b/src/runtime/runtime-atomics.cc
@@ -0,0 +1,666 @@
+// 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/lars-t-hansen/ecmascript_sharedmem
+
+namespace v8 {
+namespace internal {
+
+namespace {
+
+inline bool AtomicIsLockFree(uint32_t size) {
+ return size == 1 || size == 2 || size == 4;
+}
+
+#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);
+}
+
+#elif V8_CC_MSVC
+
+#define InterlockedCompareExchange32 _InterlockedCompareExchange
+#define InterlockedExchange32 _InterlockedExchange
+#define InterlockedExchangeAdd32 _InterlockedExchangeAdd
+#define InterlockedAnd32 _InterlockedAnd
+#define InterlockedOr32 _InterlockedOr
+#define InterlockedXor32 _InterlockedXor
+#define InterlockedExchangeAdd16 _InterlockedExchangeAdd16
+#define InterlockedCompareExchange8 _InterlockedCompareExchange8
+#define InterlockedExchangeAdd8 _InterlockedExchangeAdd8
+
+#define ATOMIC_OPS(type, suffix, vctype) \
+ 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)); \
+ } \
+ 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 LoadSeqCst(type* p) { return *p; } \
+ inline void StoreSeqCst(type* p, type value) { \
+ InterlockedExchange##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 InterlockedCompareExchange32
+#undef InterlockedExchange32
+#undef InterlockedExchangeAdd32
+#undef InterlockedAnd32
+#undef InterlockedOr32
+#undef InterlockedXor32
+#undef InterlockedExchangeAdd16
+#undef InterlockedCompareExchange8
+#undef InterlockedExchangeAdd8
+
+#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* 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* DoLoad(Isolate* isolate, void* buffer, size_t index) {
+ T result = LoadSeqCst(static_cast<T*>(buffer) + index);
+ return ToObject(isolate, result);
+}
+
+
+template <typename T>
+inline Object* DoStore(Isolate* isolate, void* buffer, size_t index,
+ Handle<Object> obj) {
+ T value = FromObject<T>(obj);
+ StoreSeqCst(static_cast<T*>(buffer) + index, value);
+ return *obj;
+}
+
+
+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);
+}
+
+
+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);
+}
+
+
+// Uint8Clamped functions
+
+uint8_t ClampToUint8(int32_t value) {
+ if (value < 0) return 0;
+ if (value > 255) return 255;
+ return value;
+}
+
+
+inline Object* DoCompareExchangeUint8Clamped(Isolate* isolate, void* buffer,
+ size_t index,
+ Handle<Object> oldobj,
+ Handle<Object> newobj) {
+ typedef int32_t convert_type;
+ uint8_t oldval = ClampToUint8(FromObject<convert_type>(oldobj));
+ uint8_t newval = ClampToUint8(FromObject<convert_type>(newobj));
+ uint8_t result = CompareExchangeSeqCst(static_cast<uint8_t*>(buffer) + index,
+ oldval, newval);
+ return ToObject(isolate, result);
+}
+
+
+inline Object* DoStoreUint8Clamped(Isolate* isolate, void* buffer, size_t index,
+ Handle<Object> obj) {
+ typedef int32_t convert_type;
+ uint8_t value = ClampToUint8(FromObject<convert_type>(obj));
+ StoreSeqCst(static_cast<uint8_t*>(buffer) + index, value);
+ return *obj;
+}
+
+
+#define DO_UINT8_CLAMPED_OP(name, op) \
+ inline Object* Do##name##Uint8Clamped(Isolate* isolate, void* buffer, \
+ size_t index, Handle<Object> obj) { \
+ typedef int32_t convert_type; \
+ uint8_t* p = static_cast<uint8_t*>(buffer) + index; \
+ convert_type operand = FromObject<convert_type>(obj); \
+ uint8_t expected; \
+ uint8_t result; \
+ do { \
+ expected = *p; \
+ result = ClampToUint8(static_cast<convert_type>(expected) op operand); \
+ } while (CompareExchangeSeqCst(p, expected, result) != expected); \
+ return ToObject(isolate, expected); \
+ }
+
+DO_UINT8_CLAMPED_OP(Add, +)
+DO_UINT8_CLAMPED_OP(Sub, -)
+DO_UINT8_CLAMPED_OP(And, &)
+DO_UINT8_CLAMPED_OP(Or, | )
+DO_UINT8_CLAMPED_OP(Xor, ^)
+
+#undef DO_UINT8_CLAMPED_OP
+
+
+inline Object* DoExchangeUint8Clamped(Isolate* isolate, void* buffer,
+ size_t index, Handle<Object> obj) {
+ typedef int32_t convert_type;
+ uint8_t* p = static_cast<uint8_t*>(buffer) + index;
+ uint8_t result = ClampToUint8(FromObject<convert_type>(obj));
+ uint8_t expected;
+ do {
+ expected = *p;
+ } while (CompareExchangeSeqCst(p, expected, result) != expected);
+ return ToObject(isolate, expected);
+}
+
+
+} // 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_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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoCompareExchangeUint8Clamped(isolate, source, index, oldobj,
+ newobj);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, sta->byte_offset());
+
+ switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+ case kExternal##Type##Array: \
+ return DoLoad<ctype>(isolate, source, index);
+
+ INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+ case kExternalUint8ClampedArray:
+ return DoLoad<uint8_t>(isolate, source, index);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, sta->byte_offset());
+
+ switch (sta->type()) {
+#define TYPED_ARRAY_CASE(Type, typeName, TYPE, ctype, size) \
+ case kExternal##Type##Array: \
+ return DoStore<ctype>(isolate, source, index, value);
+
+ INTEGER_TYPED_ARRAYS(TYPED_ARRAY_CASE)
+#undef TYPED_ARRAY_CASE
+
+ case kExternalUint8ClampedArray:
+ return DoStoreUint8Clamped(isolate, source, index, value);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoAddUint8Clamped(isolate, source, index, value);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoSubUint8Clamped(isolate, source, index, value);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoAndUint8Clamped(isolate, source, index, value);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoOrUint8Clamped(isolate, source, index, value);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoXorUint8Clamped(isolate, source, index, value);
+
+ 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);
+ RUNTIME_ASSERT(sta->GetBuffer()->is_shared());
+ RUNTIME_ASSERT(index < NumberToSize(isolate, sta->length()));
+
+ uint8_t* source = static_cast<uint8_t*>(sta->GetBuffer()->backing_store()) +
+ NumberToSize(isolate, 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
+
+ case kExternalUint8ClampedArray:
+ return DoExchangeUint8Clamped(isolate, source, index, value);
+
+ 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 isolate->heap()->ToBoolean(AtomicIsLockFree(usize));
+}
+} // namespace internal
+} // namespace v8