Crankshaft support for IN.

src/hydrogen-instructions.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 86 matching lines @@
   V(EnterInlined)                              \
   V(ExternalArrayLength)                       \
   V(FixedArrayLength)                          \
   V(FunctionLiteral)                           \
   V(GetCachedArrayIndex)                       \
   V(GlobalObject)                              \
   V(GlobalReceiver)                            \
   V(Goto)                                      \
   V(HasInstanceType)                           \
   V(HasCachedArrayIndex)                       \
+  V(In)                                        \
   V(InstanceOf)                                \
   V(InstanceOfKnownGlobal)                     \
   V(InvokeFunction)                            \
   V(IsNull)                                    \
   V(IsObject)                                  \
   V(IsSmi)                                     \
   V(IsConstructCall)                           \
   V(JSArrayLength)                             \
   V(LeaveInlined)                              \
   V(LoadContextSlot)                           \
@@ skipping 3656 matching lines @@
   virtual Representation RequiredInputRepresentation(int index) const {
     return Representation::Tagged();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(DeleteProperty)
 
   HValue* object() { return left(); }
   HValue* key() { return right(); }
 };
 
+
+class HIn: public HTemplateInstruction<2> {
+ public:
+  HIn(HValue* key, HValue* object) {
+    SetOperandAt(0, key);
+    SetOperandAt(1, object);
+    set_representation(Representation::Tagged());
+    SetAllSideEffects();
+  }
+
+  HValue* key() { return OperandAt(0); }
+  HValue* object() { return OperandAt(1); }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
+

[fschneider, 2011/04/26 13:51:59]

You should override CalculateInferredType to return Boolean.

+  virtual void PrintDataTo(StringStream* stream);
+
+  DECLARE_CONCRETE_INSTRUCTION(In)
+};
+
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_