[Atomics] code stubs for atomic operations

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

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 6d3d1b435b1ea495dbd59c0aa2db422fa7b571c4..87ebfde99a46e03b3a2452641b3dc83438cab90a 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -4669,6 +4669,20 @@ void FullCodeGenerator::EmitLoadStoreICSlot(FeedbackVectorSlot 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 __