Implement Atomics API

src/runtime/runtime-utils.h

 // Copyright 2014 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.
 
 #ifndef V8_RUNTIME_RUNTIME_UTILS_H_
 #define V8_RUNTIME_RUNTIME_UTILS_H_
 
 
 namespace v8 {
 namespace internal {
@@ skipping 36 matching lines @@
   RUNTIME_ASSERT(args[index]->IsSmi());      \
   int name = args.smi_at(index);
 
 // Cast the given argument to a double and store it in a variable with
 // the given name.  If the argument is not a number (as opposed to
 // the number not-a-number) call IllegalOperation and return.
 #define CONVERT_DOUBLE_ARG_CHECKED(name, index) \
   RUNTIME_ASSERT(args[index]->IsNumber());      \
   double name = args.number_at(index);
 
+
+// Cast the given argument to a size_t and store its value in a variable with
+// the given name.  If the argument is not a size_t call IllegalOperation and
+// return.
+#define CONVERT_SIZE_ARG_CHECKED(name, index)            \
+  RUNTIME_ASSERT(args[index]->IsNumber());               \
+  Handle<Object> name##_object = args.at<Object>(index); \
+  size_t name = 0;                                       \
+  RUNTIME_ASSERT(TryNumberToSize(isolate, *name##_object, &name));
+
+
 // Call the specified converter on the object *comand store the result in
 // a variable of the specified type with the given name.  If the
 // object is not a Number call IllegalOperation and return.
 #define CONVERT_NUMBER_CHECKED(type, name, Type, obj) \
   RUNTIME_ASSERT(obj->IsNumber());                    \
   type name = NumberTo##Type(obj);
 
 
 // Cast the given argument to PropertyDetails and store its value in a
 // variable with the given name.  If the argument is not a Smi call
@@ skipping 80 matching lines @@
 #else
 #error Unknown endianness
 #endif
 }
 #endif
 
 }
 }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_RUNTIME_UTILS_H_