Avoid one repeated property lookup when computing store ICs.

src/ic.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_IC_H_
 #define V8_IC_H_
 
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 175 matching lines @@
   Handle<Code> ComputeHandler(LookupIterator* lookup, Handle<Object> object,
                               Handle<Name> name,
                               Handle<Object> value = Handle<Code>::null());
   virtual Handle<Code> CompileHandler(LookupIterator* lookup,
                                       Handle<Object> object,
                                       Handle<Name> name, Handle<Object> value,
                                       CacheHolderFlag cache_holder) {
     UNREACHABLE();
     return Handle<Code>::null();
   }
-  // Temporary copy of the above, but using a LookupResult.
-  // TODO(jkummerow): Migrate callers to LookupIterator and delete these.
-  Handle<Code> ComputeStoreHandler(LookupResult* lookup, Handle<Object> object,
-                                   Handle<Name> name,
-                                   Handle<Object> value = Handle<Code>::null());
-  virtual Handle<Code> CompileStoreHandler(LookupResult* lookup,
-                                           Handle<Object> object,
-                                           Handle<Name> name,
-                                           Handle<Object> value,
-                                           CacheHolderFlag cache_holder) {
-    UNREACHABLE();
-    return Handle<Code>::null();
-  }
 
   void UpdateMonomorphicIC(Handle<Code> handler, Handle<Name> name);
   bool UpdatePolymorphicIC(Handle<Name> name, Handle<Code> code);
   void UpdateMegamorphicCache(HeapType* type, Name* name, Code* code);
 
   void CopyICToMegamorphicCache(Handle<Name> name);
   bool IsTransitionOfMonomorphicTarget(Map* source_map, Map* target_map);
   void PatchCache(Handle<Name> name, Handle<Code> code);
   Code::Kind kind() const { return kind_; }
   Code::Kind handler_kind() const {
     if (kind_ == Code::KEYED_LOAD_IC) return Code::LOAD_IC;
     DCHECK(kind_ == Code::LOAD_IC || kind_ == Code::STORE_IC ||
            kind_ == Code::KEYED_STORE_IC);
     return kind_;
   }
   virtual Handle<Code> megamorphic_stub() {
     UNREACHABLE();
     return Handle<Code>::null();
   }
 
   bool TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver,
                                               Handle<String> name);
 
   ExtraICState extra_ic_state() const { return extra_ic_state_; }
   void set_extra_ic_state(ExtraICState state) {
     extra_ic_state_ = state;
   }
 
   Handle<HeapType> receiver_type() { return receiver_type_; }
+  void update_receiver_type(Handle<Object> receiver) {
+    receiver_type_ = CurrentTypeOf(receiver, isolate_);
+  }
 
   void TargetMaps(MapHandleList* list) {
     FindTargetMaps();
     for (int i = 0; i < target_maps_.length(); i++) {
       list->Add(target_maps_.at(i));
     }
   }
 
   void TargetTypes(TypeHandleList* list) {
     FindTargetMaps();
@@ skipping 378 matching lines @@
   static Handle<Code> initialize_stub(Isolate* isolate,
                                       StrictMode strict_mode);
 
   MUST_USE_RESULT MaybeHandle<Object> Store(
       Handle<Object> object,
       Handle<Name> name,
       Handle<Object> value,
       JSReceiver::StoreFromKeyed store_mode =
           JSReceiver::CERTAINLY_NOT_STORE_FROM_KEYED);
 
+  bool LookupForWrite(Handle<Object> object, Handle<Name> name,
+                      Handle<Object> value, LookupIterator* it,
+                      JSReceiver::StoreFromKeyed store_mode);
+
  protected:
   virtual Handle<Code> megamorphic_stub();
 
   // Stub accessors.
   virtual Handle<Code> generic_stub() const;
 
   virtual Handle<Code> slow_stub() const {
     return isolate()->builtins()->StoreIC_Slow();
   }
 
   virtual Handle<Code> pre_monomorphic_stub() const {
     return pre_monomorphic_stub(isolate(), strict_mode());
   }
 
   static Handle<Code> pre_monomorphic_stub(Isolate* isolate,
                                            StrictMode strict_mode);
 
   // Update the inline cache and the global stub cache based on the
   // lookup result.
-  void UpdateCaches(LookupResult* lookup,
-                    Handle<JSObject> receiver,
-                    Handle<Name> name,
-                    Handle<Object> value);
-  virtual Handle<Code> CompileStoreHandler(LookupResult* lookup,
-                                           Handle<Object> object,
-                                           Handle<Name> name,
-                                           Handle<Object> value,
-                                           CacheHolderFlag cache_holder);
+  void UpdateCaches(LookupIterator* lookup, Handle<JSObject> receiver,
+                    Handle<Name> name, Handle<Object> value);
+  virtual Handle<Code> CompileHandler(LookupIterator* lookup,
+                                      Handle<Object> object, Handle<Name> name,
+                                      Handle<Object> value,
+                                      CacheHolderFlag cache_holder);
 
  private:
   void set_target(Code* code) {
     // Strict mode must be preserved across IC patching.
     DCHECK(GetStrictMode(code->extra_ic_state()) ==
            GetStrictMode(target()->extra_ic_state()));
     IC::set_target(code);
   }
 
   static void Clear(Isolate* isolate,
@@ skipping 366 matching lines @@
 DECLARE_RUNTIME_FUNCTION(ElementsTransitionAndStoreIC_Miss);
 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_Miss);
 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_MissWithAllocationSite);
 DECLARE_RUNTIME_FUNCTION(CompareNilIC_Miss);
 DECLARE_RUNTIME_FUNCTION(ToBooleanIC_Miss);
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_H_