Encapsulate megamorphic load/tail-call in hydrogen

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 212ea7b8601cb8a11602cb63ac8cd884cc540c9f..4df42dee69de7379b7bf4a863e80000d486aa7ee 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -77,6 +77,7 @@ namespace internal {
   V(CallApiFunction)                        \
   V(CallApiGetter)                          \
   V(LoadICTrampoline)                       \
+  V(MegamorphicLoad)                        \
   V(VectorLoad)                             \
   V(KeyedLoadICTrampoline)                  \
   V(VectorKeyedLoad)                        \
@@ -1961,6 +1962,37 @@ class KeyedLoadICTrampolineStub : public LoadICTrampolineStub {
 };
 
 
+class MegamorphicLoadStub : public HydrogenCodeStub {
+ public:
+  MegamorphicLoadStub(Isolate* isolate, const LoadIC::State& state)
+      : HydrogenCodeStub(isolate) {
+    set_sub_minor_key(state.GetExtraICState());
+  }
+
+  virtual Handle<Code> GenerateCode() OVERRIDE;
+
+  virtual void InitializeInterfaceDescriptor(
+      CodeStubInterfaceDescriptor* descriptor) OVERRIDE;
+
+  static void InstallDescriptors(Isolate* isolate);
+
+  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());
+  }
+
+ private:
+  virtual Major MajorKey() const OVERRIDE { return MegamorphicLoad; }

[Yang, 2014/09/08 08:43:00]

Please rebase this CL and use the new DEFINE_HYDROGEN_CODE_STUB macro.

[mvstanton, 2014/09/08 12:35:20]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(MegamorphicLoadStub);
+};
+
+
 class VectorLoadStub : public HydrogenCodeStub {
  public:
   explicit VectorLoadStub(Isolate* isolate, const LoadIC::State& state)