Re-enable optimization for hot functions that have optimization disabled due to many deopts.

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 5443 matching lines @@
   int GetThisPropertyAssignmentArgument(int index);
   Object* GetThisPropertyAssignmentConstant(int index);
 
   // [source code]: Source code for the function.
   bool HasSourceCode();
   Handle<Object> GetSourceCode();
 
   inline int opt_count();
   inline void set_opt_count(int opt_count);
 
+  // Number of times we tried to reenable optimization.
+  inline int opt_reenable_tries();
+  inline void set_opt_reenable_tries(int opt_reenable_tries);
+
+  inline void TryReenableOptimization();
+
+
   // Source size of this function.
   int SourceSize();
 
   // Calculate the instance size.
   int CalculateInstanceSize();
 
   // Calculate the number of in-object properties.
   int CalculateInObjectProperties();
 
   // Dispatched behavior.
@@ skipping 36 matching lines @@
       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 kInitialMapOffset =
       kInferredNameOffset + kPointerSize;
   static const int kThisPropertyAssignmentsOffset =
       kInitialMapOffset + kPointerSize;
-  // ic_age 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 kICAgeOffset = kThisPropertyAssignmentsOffset + kPointerSize;
 #if V8_HOST_ARCH_32_BIT
   // Smi fields.
   static const int kLengthOffset =
-      kICAgeOffset + kPointerSize;
+      kThisPropertyAssignmentsOffset + kPointerSize;
   static const int kFormalParameterCountOffset = kLengthOffset + kPointerSize;
   static const int kExpectedNofPropertiesOffset =
       kFormalParameterCountOffset + kPointerSize;
   static const int kNumLiteralsOffset =
       kExpectedNofPropertiesOffset + kPointerSize;
   static const int kStartPositionAndTypeOffset =
       kNumLiteralsOffset + kPointerSize;
   static const int kEndPositionOffset =
       kStartPositionAndTypeOffset + kPointerSize;
   static const int kFunctionTokenPositionOffset =
       kEndPositionOffset + kPointerSize;
   static const int kCompilerHintsOffset =
       kFunctionTokenPositionOffset + kPointerSize;
   static const int kThisPropertyAssignmentsCountOffset =
       kCompilerHintsOffset + kPointerSize;
   static const int kOptCountOffset =
       kThisPropertyAssignmentsCountOffset + kPointerSize;
   static const int kAstNodeCountOffset = kOptCountOffset + kPointerSize;
   static const int kDeoptCounterOffset = kAstNodeCountOffset + kPointerSize;
-
-
+  static const int kICAgeOffset = kDeoptCounterOffset + kPointerSize;
+  static const int kOptReenableTriesOffset = kICAgeOffset + kPointerSize;
   // Total size.
-  static const int kSize = kDeoptCounterOffset + kPointerSize;
+  static const int kSize = kOptReenableTriesOffset + kPointerSize;
 #else
   // The only reason to use smi fields instead of int fields
   // is to allow iteration without maps decoding during
   // garbage collections.
   // To avoid wasting space on 64-bit architectures we use
   // the following trick: we group integer fields into pairs
   // First integer in each pair is shifted left by 1.
   // By doing this we guarantee that LSB of each kPointerSize aligned
   // word is not set and thus this word cannot be treated as pointer
   // to HeapObject during old space traversal.
@@ skipping 18 matching lines @@
       kFunctionTokenPositionOffset + kIntSize;
 
   static const int kThisPropertyAssignmentsCountOffset =
       kCompilerHintsOffset + kIntSize;
   static const int kOptCountOffset =
       kThisPropertyAssignmentsCountOffset + kIntSize;
 
   static const int kAstNodeCountOffset = kOptCountOffset + kIntSize;
   static const int kDeoptCounterOffset = kAstNodeCountOffset + kIntSize;
 
+  static const int kICAgeOffset = kDeoptCounterOffset + kIntSize;
+  static const int kOptReenableTriesOffset = kICAgeOffset + kIntSize;
+
   // Total size.
-  static const int kSize = kDeoptCounterOffset + kIntSize;
+  static const int kSize = kOptReenableTriesOffset + kIntSize;
 
 #endif
 
   // The construction counter for inobject slack tracking is stored in the
   // most significant byte of compiler_hints which is otherwise unused.
   // Its offset depends on the endian-ness of the architecture.
 #if __BYTE_ORDER == __LITTLE_ENDIAN
   static const int kConstructionCountOffset = kCompilerHintsOffset + 3;
 #elif __BYTE_ORDER == __BIG_ENDIAN
   static const int kConstructionCountOffset = kCompilerHintsOffset + 0;
@@ skipping 3029 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_