[Atomics] code stubs for atomic operations

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 4651 matching lines @@
   __ Store(pending_message_obj, rdx);
 }
 
 
 void FullCodeGenerator::EmitLoadStoreICSlot(FeedbackVectorSlot slot) {
   DCHECK(!slot.IsInvalid());
   __ Move(VectorStoreICTrampolineDescriptor::SlotRegister(), SmiFromSlot(slot));
 }
 
 
+void FullCodeGenerator::EmitAtomicsLoad(CallRuntime* expr) {

[Jarin, 2016/01/28 08:11:11]

You can use FullCodeGenerator::EmitIntrinsicAsStubCall (in full-codegen.cc) to
avoid the boilerplate code.

+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK(args->length() == 2);
+
+  VisitForStackValue(args->at(0));        // Load the object.
+  VisitForAccumulatorValue(args->at(1));  // Load the index.
+  __ Pop(rdx);
+
+  AtomicsLoadStub stub(isolate());
+  __ CallStub(&stub);
+  context()->Plug(rax);
+}
+
+
 #undef __
 
 
 static const byte kJnsInstruction = 0x79;
 static const byte kNopByteOne = 0x66;
 static const byte kNopByteTwo = 0x90;
 #ifdef DEBUG
 static const byte kCallInstruction = 0xe8;
 #endif
 
@@ skipping 64 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64