Generate the TransitionElementsStub using Crankshaft

src/code-stubs.h

 // Copyright 2012 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 59 matching lines @@
   V(ArgumentsAccess)                     \
   V(RegExpConstructResult)               \
   V(NumberToString)                      \
   V(CEntry)                              \
   V(JSEntry)                             \
   V(KeyedLoadElement)                    \
   V(KeyedStoreElement)                   \
   V(DebuggerStatement)                   \
   V(StringDictionaryLookup)              \
   V(ElementsTransitionAndStore)          \
+  V(TransitionElementsKind)              \
   V(StoreArrayLiteralElement)            \
   V(StubFailureTrampoline)               \
   V(ProfileEntryHook)
 
 // List of code stubs only used on ARM platforms.
 #ifdef V8_TARGET_ARCH_ARM
 #define CODE_STUB_LIST_ARM(V)  \
   V(GetProperty)               \
   V(SetProperty)               \
   V(InvokeBuiltin)             \
@@ skipping 1121 matching lines @@
 
  private:
   class IsJSArrayBits: public BitField<bool, 8, 1> {};
   class ElementsKindBits: public BitField<ElementsKind, 0, 8> {};
   uint32_t bit_field_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyedLoadFastElementStub);
 };
 
 
+class TransitionElementsKindStub : public HydrogenCodeStub {
+ public:
+  TransitionElementsKindStub(ElementsKind from_kind,
+                             ElementsKind to_kind) {
+    bit_field_ = FromKindBits::encode(from_kind) |
+        ToKindBits::encode(to_kind);
+  }
+
+  Major MajorKey() { return TransitionElementsKind; }
+  int MinorKey() { return bit_field_; }
+
+  ElementsKind from_kind() const {
+    return FromKindBits::decode(bit_field_);
+  }
+
+  ElementsKind to_kind() const {
+    return ToKindBits::decode(bit_field_);
+  }
+
+  virtual Handle<Code> GenerateCode();
+
+  virtual void InitializeInterfaceDescriptor(
+      Isolate* isolate,
+      CodeStubInterfaceDescriptor* descriptor);
+
+ private:
+  class FromKindBits: public BitField<ElementsKind, 8, 8> {};
+  class ToKindBits: public BitField<ElementsKind, 0, 8> {};
+  uint32_t bit_field_;
+
+  DISALLOW_COPY_AND_ASSIGN(TransitionElementsKindStub);
+};
+
+
 class KeyedStoreElementStub : public PlatformCodeStub {
  public:
   KeyedStoreElementStub(bool is_js_array,
                         ElementsKind elements_kind,
                         KeyedAccessGrowMode grow_mode)
       : is_js_array_(is_js_array),
         elements_kind_(elements_kind),
         grow_mode_(grow_mode),
         fp_registers_(CanUseFPRegisters()) { }
 
@@ skipping 194 matching lines @@
 
   // The current function entry hook.
   static FunctionEntryHook entry_hook_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_