Introduce HTransitionElementsKind instruction.

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 153 matching lines @@
   V(StoreNamedGeneric)                         \
   V(StringAdd)                                 \
   V(StringCharCodeAt)                          \
   V(StringCharFromCode)                        \
   V(StringLength)                              \
   V(Sub)                                       \
   V(ThisFunction)                              \
   V(Throw)                                     \
   V(ToFastProperties)                          \
   V(ToInt32)                                   \
+  V(TransitionElementsKind)                    \
   V(Typeof)                                    \
   V(TypeofIsAndBranch)                         \
   V(UnaryMathOperation)                        \
   V(UnknownOSRValue)                           \
   V(UseConst)                                  \
   V(ValueOf)
 
 #define GVN_FLAG_LIST(V)                       \
   V(Calls)                                     \
   V(InobjectFields)                            \
@@ skipping 3695 matching lines @@
 
   virtual void PrintDataTo(StringStream* stream);
 
   DECLARE_CONCRETE_INSTRUCTION(StoreKeyedGeneric)
 
  private:
   bool strict_mode_;
 };
 
 
+class HTransitionElementsKind: public HTemplateInstruction<1> {
+ public:
+  HTransitionElementsKind(HValue* object,
+                          Handle<Map> original_map,
+                          Handle<Map> transitioned_map)
+      : original_map_(original_map),
+        transitioned_map_(transitioned_map) {
+    SetOperandAt(0, object);
+    SetFlag(kUseGVN);
+    SetFlag(kDependsOnMaps);
+    set_representation(Representation::Tagged());
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return Representation::Tagged();
+  }
+
+  HValue* object() { return OperandAt(0); }
+  Handle<Map> original_map() { return original_map_; }
+  Handle<Map> transitioned_map() { return transitioned_map_; }
+
+  virtual void PrintDataTo(StringStream* stream);
+
+  DECLARE_CONCRETE_INSTRUCTION(TransitionElementsKind)
+
+ protected:
+  virtual bool DataEquals(HValue* other) {
+    HTransitionElementsKind* instr = HTransitionElementsKind::cast(other);
+    return original_map_.is_identical_to(instr->original_map()) &&
+        transitioned_map_.is_identical_to(instr->transitioned_map());
+  }
+
+ private:
+  Handle<Map> original_map_;
+  Handle<Map> transitioned_map_;
+};
+
+
 class HStringAdd: public HBinaryOperation {
  public:
   HStringAdd(HValue* context, HValue* left, HValue* right)
       : HBinaryOperation(context, left, right) {
     set_representation(Representation::Tagged());
     SetFlag(kUseGVN);
     SetFlag(kDependsOnMaps);
   }
 
   virtual Representation RequiredInputRepresentation(int index) {
@@ skipping 334 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(In)
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_