Encapsulate megamorphic load/tail-call in hydrogen

src/code-stubs.h

 // Copyright 2012 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.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 49 matching lines @@
   V(FastCloneShallowArray)                  \
   V(FastCloneShallowObject)                 \
   V(FastNewClosure)                         \
   V(FastNewContext)                         \
   V(InternalArrayNArgumentsConstructor)     \
   V(InternalArrayNoArgumentConstructor)     \
   V(InternalArraySingleArgumentConstructor) \
   V(KeyedLoadGeneric)                       \
   V(LoadDictionaryElement)                  \
   V(LoadFastElement)                        \
+  V(MegamorphicLoad)                        \
   V(NameDictionaryLookup)                   \
   V(NumberToString)                         \
   V(RegExpConstructResult)                  \
   V(StoreFastElement)                       \
   V(StringAdd)                              \
   V(ToBoolean)                              \
   V(ToNumber)                               \
   V(TransitionElementsKind)                 \
   V(VectorKeyedLoad)                        \
   V(VectorLoad)                             \
@@ skipping 1646 matching lines @@
       : LoadICTrampolineStub(isolate, LoadIC::State(0)) {}
 
   virtual Code::Kind GetCodeKind() const OVERRIDE {
     return Code::KEYED_LOAD_IC;
   }
 
   DEFINE_PLATFORM_CODE_STUB(KeyedLoadICTrampoline, LoadICTrampolineStub);
 };
 
 
+class MegamorphicLoadStub : public HydrogenCodeStub {
+ public:
+  MegamorphicLoadStub(Isolate* isolate, const LoadIC::State& state)
+      : HydrogenCodeStub(isolate) {
+    set_sub_minor_key(state.GetExtraICState());
+  }
+
+  virtual Code::Kind GetCodeKind() const OVERRIDE { return Code::LOAD_IC; }
+
+  virtual InlineCacheState GetICState() const FINAL OVERRIDE {
+    return MEGAMORPHIC;
+  }
+
+  virtual ExtraICState GetExtraICState() const FINAL OVERRIDE {
+    return static_cast<ExtraICState>(sub_minor_key());
+  }
+
+  DEFINE_HYDROGEN_CODE_STUB(MegamorphicLoad, HydrogenCodeStub);
+};
+
+
 class VectorLoadStub : public HydrogenCodeStub {
  public:
   explicit VectorLoadStub(Isolate* isolate, const LoadIC::State& state)
       : HydrogenCodeStub(isolate) {
     set_sub_minor_key(state.GetExtraICState());
   }
 
   virtual Code::Kind GetCodeKind() const OVERRIDE { return Code::LOAD_IC; }
 
   virtual InlineCacheState GetICState() const FINAL OVERRIDE {
@@ skipping 550 matching lines @@
 
 
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_