Flesh out vector ic state query and set mechanisms.

src/type-feedback-vector.h

 // Copyright 2014 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_TYPE_FEEDBACK_VECTOR_H_
 #define V8_TYPE_FEEDBACK_VECTOR_H_
 
 #include "src/checks.h"
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
@@ skipping 184 matching lines @@
   FeedbackVectorICSlot slot() const { return slot_; }
 
   InlineCacheState ic_state() const { return StateFromFeedback(); }
   Map* FindFirstMap() const {
     MapHandleList maps;
     ExtractMaps(&maps);
     if (maps.length() > 0) return *maps.at(0);
     return NULL;
   }
 
+  // TODO(mvstanton): remove FindAllMaps, it didn't survive a code review.
+  void FindAllMaps(MapHandleList* maps) const { ExtractMaps(maps); }
+
   virtual InlineCacheState StateFromFeedback() const = 0;
   virtual int ExtractMaps(MapHandleList* maps) const = 0;
   virtual MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const = 0;
   virtual bool FindHandlers(CodeHandleList* code_list, int length = -1) const {
     return length == 0;
   }
   virtual Name* FindFirstName() const { return NULL; }
 
   Object* GetFeedback() const { return vector()->Get(slot()); }
 
@@ skipping 28 matching lines @@
  public:
   CallICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot)
       : FeedbackNexus(vector, slot) {
     DCHECK(vector->GetKind(slot) == Code::CALL_IC);
   }
   CallICNexus(TypeFeedbackVector* vector, FeedbackVectorICSlot slot)
       : FeedbackNexus(vector, slot) {
     DCHECK(vector->GetKind(slot) == Code::CALL_IC);
   }
 
+  void Clear(Code* host);
+
   void ConfigureUninitialized();
   void ConfigureGeneric();
   void ConfigureMonomorphicArray();
   void ConfigureMonomorphic(Handle<JSFunction> function);
 
   virtual InlineCacheState StateFromFeedback() const OVERRIDE;
 
   virtual int ExtractMaps(MapHandleList* maps) const OVERRIDE {
     // CallICs don't record map feedback.
     return 0;
   }
   virtual MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const OVERRIDE {
     return MaybeHandle<Code>();
   }
   virtual bool FindHandlers(CodeHandleList* code_list,
                             int length = -1) const OVERRIDE {
     return length == 0;
   }
 };
+
+
+class LoadICNexus : public FeedbackNexus {
+ public:
+  LoadICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot)
+      : FeedbackNexus(vector, slot) {
+    DCHECK(vector->GetKind(slot) == Code::LOAD_IC);
+  }
+  LoadICNexus(TypeFeedbackVector* vector, FeedbackVectorICSlot slot)
+      : FeedbackNexus(vector, slot) {
+    DCHECK(vector->GetKind(slot) == Code::LOAD_IC);
+  }
+
+  void Clear(Code* host);
+
+  void ConfigureMegamorphic();
+  void ConfigurePremonomorphic();
+  void ConfigureMonomorphic(Handle<HeapType> type, Handle<Code> handler);
+
+  void ConfigurePolymorphic(TypeHandleList* types, CodeHandleList* handlers);
+
+  virtual InlineCacheState StateFromFeedback() const OVERRIDE;
+  virtual int ExtractMaps(MapHandleList* maps) const OVERRIDE;
+  virtual MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const OVERRIDE;
+  virtual bool FindHandlers(CodeHandleList* code_list,
+                            int length = -1) const OVERRIDE;
+};
+
+
+class KeyedLoadICNexus : public FeedbackNexus {
+ public:
+  KeyedLoadICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot)
+      : FeedbackNexus(vector, slot) {
+    DCHECK(vector->GetKind(slot) == Code::KEYED_LOAD_IC);
+  }
+  KeyedLoadICNexus(TypeFeedbackVector* vector, FeedbackVectorICSlot slot)
+      : FeedbackNexus(vector, slot) {
+    DCHECK(vector->GetKind(slot) == Code::KEYED_LOAD_IC);
+  }
+
+  void Clear(Code* host);
+
+  void ConfigureMegamorphic();
+  void ConfigureGeneric();
+  void ConfigurePremonomorphic();
+  // name can be a null handle for element loads.
+  void ConfigureMonomorphic(Handle<Name> name, Handle<HeapType> type,
+                            Handle<Code> handler);
+  // name can be null.
+  void ConfigurePolymorphic(Handle<Name> name, TypeHandleList* types,
+                            CodeHandleList* handlers);
+
+  virtual InlineCacheState StateFromFeedback() const OVERRIDE;
+  virtual int ExtractMaps(MapHandleList* maps) const OVERRIDE;
+  virtual MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const OVERRIDE;
+  virtual bool FindHandlers(CodeHandleList* code_list,
+                            int length = -1) const OVERRIDE;
+  virtual Name* FindFirstName() const OVERRIDE;
+};
 }
 }  // namespace v8::internal
 
 #endif  // V8_TRANSITIONS_H_