Avoid one repeated property lookup when computing load 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 161 matching lines @@
 
   // Access the target code for the given IC address.
   static inline Code* GetTargetAtAddress(Address address,
                                          ConstantPoolArray* constant_pool);
   static inline void SetTargetAtAddress(Address address,
                                         Code* target,
                                         ConstantPoolArray* constant_pool);
   static void PostPatching(Address address, Code* target, Code* old_target);
 
   // Compute the handler either by compiling or by retrieving a cached version.
-  Handle<Code> ComputeHandler(LookupResult* lookup,
-                              Handle<Object> object,
+  Handle<Code> ComputeHandler(LookupIterator* lookup, Handle<Object> object,
                               Handle<String> name,
                               Handle<Object> value = Handle<Code>::null());
-  virtual Handle<Code> CompileHandler(LookupResult* lookup,
+  virtual Handle<Code> CompileHandler(LookupIterator* lookup,
                                       Handle<Object> object,
                                       Handle<String> 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<String> name,
+                                   Handle<Object> value = Handle<Code>::null());
+  virtual Handle<Code> CompileStoreHandler(LookupResult* lookup,
+                                           Handle<Object> object,
+                                           Handle<String> name,
+                                           Handle<Object> value,
+                                           CacheHolderFlag cache_holder) {
+    UNREACHABLE();
+    return Handle<Code>::null();
+  }
 
   void UpdateMonomorphicIC(Handle<Code> handler, Handle<String> name);
   bool UpdatePolymorphicIC(Handle<String> name, Handle<Code> code);
   void UpdateMegamorphicCache(HeapType* type, Name* name, Code* code);
 
   void CopyICToMegamorphicCache(Handle<String> name);
   bool IsTransitionOfMonomorphicTarget(Map* source_map, Map* target_map);
   void PatchCache(Handle<String> name, Handle<Code> code);
   Code::Kind kind() const { return kind_; }
   Code::Kind handler_kind() const {
@@ skipping 264 matching lines @@
     } else {
       ASSERT_EQ(Code::KEYED_LOAD_IC, kind());
       return isolate()->builtins()->KeyedLoadIC_Slow();
     }
   }
 
   virtual Handle<Code> megamorphic_stub();
 
   // Update the inline cache and the global stub cache based on the
   // lookup result.
-  void UpdateCaches(LookupResult* lookup,
-                    Handle<Object> object,
+  void UpdateCaches(LookupIterator* lookup, Handle<Object> object,
                     Handle<String> name);
 
-  virtual Handle<Code> CompileHandler(LookupResult* lookup,
+  virtual Handle<Code> CompileHandler(LookupIterator* lookup,
                                       Handle<Object> object,
                                       Handle<String> name,
                                       Handle<Object> unused,
                                       CacheHolderFlag cache_holder);
 
  private:
   virtual Handle<Code> pre_monomorphic_stub() const;
   static Handle<Code> pre_monomorphic_stub(Isolate* isolate,
                                            ExtraICState extra_state);
 
@@ skipping 139 matching lines @@
 
   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<String> name,
                     Handle<Object> value);
-  virtual Handle<Code> CompileHandler(LookupResult* lookup,
-                                      Handle<Object> object,
-                                      Handle<String> name, Handle<Object> value,
-                                      CacheHolderFlag cache_holder);
+  virtual Handle<Code> CompileStoreHandler(LookupResult* lookup,
+                                           Handle<Object> object,
+                                           Handle<String> name,
+                                           Handle<Object> value,
+                                           CacheHolderFlag cache_holder);
 
  private:
   void set_target(Code* code) {
     // Strict mode must be preserved across IC patching.
     ASSERT(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_