[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 15 matching lines @@
 #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>
@@ skipping 57 matching lines @@
   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) */
@@ skipping 78 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 122 matching lines @@
 // 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_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()));
@@ skipping 15 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);
   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()) +
@@ skipping 213 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