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 59 matching lines @@
   V(TransitionElementsKind)                 \
   V(StoreArrayLiteralElement)               \
   V(StubFailureTrampoline)                  \
   V(ArrayConstructor)                       \
   V(InternalArrayConstructor)               \
   V(ProfileEntryHook)                       \
   V(StoreGlobal)                            \
   V(CallApiFunction)                        \
   V(CallApiGetter)                          \
   V(LoadICTrampoline)                       \
+  V(MegamorphicLoad)                        \
   V(VectorLoad)                             \
   V(KeyedLoadICTrampoline)                  \
   V(VectorKeyedLoad)                        \
   /* IC Handler stubs */                    \
   V(LoadField)                              \
   V(StoreField)                             \
   V(LoadConstant)                           \
   V(StringLength)
 
 // List of code stubs only used on ARM 32 bits platforms.
@@ skipping 1864 matching lines @@
 
   virtual Major MajorKey() const OVERRIDE { return KeyedLoadICTrampoline; }
 
  private:
   virtual void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(KeyedLoadICTrampolineStub);
 };
 
 
+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)
       : HydrogenCodeStub(isolate) {
     set_sub_minor_key(state.GetExtraICState());
   }
 
   virtual Handle<Code> GenerateCode() OVERRIDE;
 
   virtual void InitializeInterfaceDescriptor(
@@ skipping 696 matching lines @@
  private:
   virtual Major MajorKey() const { return StringCompare; }
 
   virtual void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(StringCompareStub);
 };
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_