[Atomics] code stubs for atomic operations

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 12981 matching lines @@
 void HOptimizedGraphBuilder::GenerateDebugIsActive(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 0);
   HValue* ref =
       Add<HConstant>(ExternalReference::debug_is_active_address(isolate()));
   HValue* value =
       Add<HLoadNamedField>(ref, nullptr, HObjectAccess::ForExternalUInteger8());
   return ast_context()->ReturnValue(value);
 }
 
 
+void HOptimizedGraphBuilder::GenerateAtomicsLoad(CallRuntime* call) {
+  DCHECK(call->arguments()->length() == 2);
+  CHECK_ALIVE(VisitExpressions(call->arguments()));
+  PushArgumentsFromEnvironment(call->arguments()->length());
+  HCallStub* result = New<HCallStub>(CodeStub::AtomicsLoad, 2);

[Jarin, 2016/01/28 08:11:12]

I would use HCallWithDescriptor. For example, see
HOptimizedGraphBuilder::GenerateToLength.

[binji, 2016/01/28 16:20:01]

Done.

+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 #undef CHECK_BAILOUT
 #undef CHECK_ALIVE
 
 
 HEnvironment::HEnvironment(HEnvironment* outer,
                            Scope* scope,
                            Handle<JSFunction> closure,
                            Zone* zone)
     : closure_(closure),
       values_(0, zone),
@@ skipping 620 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8