Revert "Continued fix for 351257. Reusing the feedback vector is too complex."

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5479 matching lines @@
 
   template<typename StaticVisitor>
   inline void CodeIterateBody(Heap* heap);
 
   DECLARE_PRINTER(Code)
   DECLARE_VERIFIER(Code)
 
   void ClearInlineCaches();
   void ClearInlineCaches(Kind kind);
 
+  void ClearTypeFeedbackInfo(Heap* heap);
+
   BailoutId TranslatePcOffsetToAstId(uint32_t pc_offset);
   uint32_t TranslateAstIdToPcOffset(BailoutId ast_id);
 
 #define DECLARE_CODE_AGE_ENUM(X) k##X##CodeAge,
   enum Age {
     kNotExecutedCodeAge = -2,
     kExecutedOnceCodeAge = -1,
     kNoAgeCodeAge = 0,
     CODE_AGE_LIST(DECLARE_CODE_AGE_ENUM)
     kAfterLastCodeAge,
@@ skipping 1175 matching lines @@
   FixedArray* GetLiteralsFromOptimizedCodeMap(int index);
 
   Code* GetCodeFromOptimizedCodeMap(int index);
 
   // Clear optimized code map.
   void ClearOptimizedCodeMap();
 
   // Removed a specific optimized code object from the optimized code map.
   void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason);
 
-  void ClearTypeFeedbackInfo(Heap* heap);
-
   // Trims the optimized code map after entries have been removed.
   void TrimOptimizedCodeMap(int shrink_by);
 
   // Add a new entry to the optimized code map.
   MUST_USE_RESULT MaybeObject* AddToOptimizedCodeMap(Context* native_context,
                                                      Code* code,
                                                      FixedArray* literals,
                                                      BailoutId osr_ast_id);
   static void AddToOptimizedCodeMap(Handle<SharedFunctionInfo> shared,
                                     Handle<Context> native_context,
@@ skipping 88 matching lines @@
   //  Important: inobject slack tracking is not attempted during the snapshot
   //  creation.
 
   static const int kGenerousAllocationCount = 8;
 
   // [construction_count]: Counter for constructor calls made during
   // the tracking phase.
   inline int construction_count();
   inline void set_construction_count(int value);
 
-  // [feedback_vector] - accumulates ast node feedback from full-codegen and
-  // (increasingly) from crankshafted code where sufficient feedback isn't
-  // available. Currently the field is duplicated in
-  // TypeFeedbackInfo::feedback_vector, but the allocation is done here.
-  DECL_ACCESSORS(feedback_vector, FixedArray)
-
   // [initial_map]: initial map of the first function called as a constructor.
   // Saved for the duration of the tracking phase.
   // This is a weak link (GC resets it to undefined_value if no other live
   // object reference this map).
   DECL_ACCESSORS(initial_map, Object)
 
   // True if the initial_map is not undefined and the countdown stub is
   // installed.
   inline bool IsInobjectSlackTrackingInProgress();
 
@@ skipping 260 matching lines @@
   static const int kOptimizedCodeMapOffset = kCodeOffset + kPointerSize;
   static const int kScopeInfoOffset = kOptimizedCodeMapOffset + kPointerSize;
   static const int kConstructStubOffset = kScopeInfoOffset + kPointerSize;
   static const int kInstanceClassNameOffset =
       kConstructStubOffset + kPointerSize;
   static const int kFunctionDataOffset =
       kInstanceClassNameOffset + kPointerSize;
   static const int kScriptOffset = kFunctionDataOffset + kPointerSize;
   static const int kDebugInfoOffset = kScriptOffset + kPointerSize;
   static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize;
-  static const int kFeedbackVectorOffset =
+  static const int kInitialMapOffset =
       kInferredNameOffset + kPointerSize;
-  static const int kInitialMapOffset =
-      kFeedbackVectorOffset + kPointerSize;
   // ast_node_count is a Smi field. It could be grouped with another Smi field
   // into a PSEUDO_SMI_ACCESSORS pair (on x64), if one becomes available.
   static const int kAstNodeCountOffset =
       kInitialMapOffset + kPointerSize;
 #if V8_HOST_ARCH_32_BIT
   // Smi fields.
   static const int kLengthOffset =
       kAstNodeCountOffset + kPointerSize;
   static const int kFormalParameterCountOffset = kLengthOffset + kPointerSize;
   static const int kExpectedNofPropertiesOffset =
@@ skipping 1065 matching lines @@
   inline void change_ic_with_type_info_count(int count);
 
   inline void initialize_storage();
 
   inline void change_own_type_change_checksum();
   inline int own_type_change_checksum();
 
   inline void set_inlined_type_change_checksum(int checksum);
   inline bool matches_inlined_type_change_checksum(int checksum);
 
+  DECL_ACCESSORS(feedback_vector, FixedArray)
+
   static inline TypeFeedbackInfo* cast(Object* obj);
 
   // Dispatched behavior.
   DECLARE_PRINTER(TypeFeedbackInfo)
   DECLARE_VERIFIER(TypeFeedbackInfo)
 
   static const int kStorage1Offset = HeapObject::kHeaderSize;
   static const int kStorage2Offset = kStorage1Offset + kPointerSize;
-  static const int kSize = kStorage2Offset + kPointerSize;
+  static const int kFeedbackVectorOffset =
+      kStorage2Offset + kPointerSize;
+  static const int kSize = kFeedbackVectorOffset + kPointerSize;
 
-  // TODO(mvstanton): move these sentinel declarations to shared function info.
   // The object that indicates an uninitialized cache.
   static inline Handle<Object> UninitializedSentinel(Isolate* isolate);
 
   // The object that indicates a megamorphic state.
   static inline Handle<Object> MegamorphicSentinel(Isolate* isolate);
 
   // The object that indicates a monomorphic state of Array with
   // ElementsKind
   static inline Handle<Object> MonomorphicArraySentinel(Isolate* isolate,
       ElementsKind elements_kind);
 
   // A raw version of the uninitialized sentinel that's safe to read during
   // garbage collection (e.g., for patching the cache).
   static inline Object* RawUninitializedSentinel(Heap* heap);
 
+  static const int kForInFastCaseMarker = 0;
+  static const int kForInSlowCaseMarker = 1;
+
  private:
   static const int kTypeChangeChecksumBits = 7;
 
   class ICTotalCountField: public BitField<int, 0,
       kSmiValueSize - kTypeChangeChecksumBits> {};  // NOLINT
   class OwnTypeChangeChecksum: public BitField<int,
       kSmiValueSize - kTypeChangeChecksumBits,
       kTypeChangeChecksumBits> {};  // NOLINT
   class ICsWithTypeInfoCountField: public BitField<int, 0,
       kSmiValueSize - kTypeChangeChecksumBits> {};  // NOLINT
@@ skipping 2565 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_