[Atomics] code stubs for atomic operations

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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/conversions-inl.h"
@@ skipping 198 matching lines @@
                                  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,
@@ skipping 158 matching lines @@
     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);
@@ skipping 218 matching lines @@
 
 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