[Atomics] code stubs for atomic operations

src/crankshaft/x64/lithium-codegen-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 909 matching lines @@
     case CodeStub::RegExpExec: {
       RegExpExecStub stub(isolate());
       CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
       break;
     }
     case CodeStub::SubString: {
       SubStringStub stub(isolate());
       CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
       break;
     }
+    case CodeStub::AtomicsLoad: {

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

You should not need this if you used HCallWithDesriptor.

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

Done.

+      // TODO(binji): better way to do this?
+      AtomicsLoadDescriptor descriptor(isolate());
+      DCHECK(descriptor.GetRegisterParameterCount() == 2);
+      __ Pop(descriptor.GetRegisterParameter(1));
+      __ Pop(descriptor.GetRegisterParameter(0));
+      AtomicsLoadStub stub(isolate());
+      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+      break;
+    }
     default:
       UNREACHABLE();
   }
 }
 
 
 void LCodeGen::DoUnknownOSRValue(LUnknownOSRValue* instr) {
   GenerateOsrPrologue();
 }
 
@@ skipping 4702 matching lines @@
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64