Reset function info counters after context disposal.

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 4405 matching lines @@
   inline void CodeIterateBody(Heap* heap);
 #ifdef OBJECT_PRINT
   inline void CodePrint() {
     CodePrint(stdout);
   }
   void CodePrint(FILE* out);
 #endif
 #ifdef DEBUG
   void CodeVerify();
 #endif
+  void ClearInlineCaches();
 
   // Max loop nesting marker used to postpose OSR. We don't take loop
   // nesting that is deeper than 5 levels into account.
   static const int kMaxLoopNestingMarker = 6;
 
   // Layout description.
   static const int kInstructionSizeOffset = HeapObject::kHeaderSize;
   static const int kRelocationInfoOffset = kInstructionSizeOffset + kIntSize;
   static const int kHandlerTableOffset = kRelocationInfoOffset + kPointerSize;
   static const int kDeoptimizationDataOffset =
@@ skipping 880 matching lines @@
   DECL_BOOLEAN_ACCESSORS(is_expression)
 
   // Is this function a top-level function (scripts, evals).
   DECL_BOOLEAN_ACCESSORS(is_toplevel)
 
   // Bit field containing various information collected by the compiler to
   // drive optimization.
   inline int compiler_hints();
   inline void set_compiler_hints(int value);
 
+  inline int ast_node_count();
+  inline void set_ast_node_count(int count);
+
   // A counter used to determine when to stress the deoptimizer with a
   // deopt.
   inline int deopt_counter();
   inline void set_deopt_counter(int counter);
 
   inline int profiler_ticks();
   inline void set_profiler_ticks(int ticks);
 
-  inline int ast_node_count();
-  inline void set_ast_node_count(int count);
+  // Inline cache age is used to infer whether the function survived a context
+  // disposal or not. In the former case we reset the opt_count.
+  inline int ic_age();
+  inline void set_ic_age(int age);
 
   // Add information on assignments of the form this.x = ...;
   void SetThisPropertyAssignmentsInfo(
       bool has_only_simple_this_property_assignments,
       FixedArray* this_property_assignments);
 
   // Clear information on assignments of the form this.x = ...;
   void ClearThisPropertyAssignmentsInfo();
 
   // Indicate that this function only consists of assignments of the form
@@ skipping 125 matching lines @@
 #ifdef OBJECT_PRINT
   inline void SharedFunctionInfoPrint() {
     SharedFunctionInfoPrint(stdout);
   }
   void SharedFunctionInfoPrint(FILE* out);
 #endif
 #ifdef DEBUG
   void SharedFunctionInfoVerify();
 #endif
 
+  void ResetForNewContext(int new_ic_age);
+
   // Helpers to compile the shared code.  Returns true on success, false on
   // failure (e.g., stack overflow during compilation).
   static bool EnsureCompiled(Handle<SharedFunctionInfo> shared,
                              ClearExceptionFlag flag);
   static bool CompileLazy(Handle<SharedFunctionInfo> shared,
                           ClearExceptionFlag flag);
 
   // Casting.
   static inline SharedFunctionInfo* cast(Object* obj);
 
@@ skipping 10 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;
-  static const int kProfilerTicksOffset =
-      kThisPropertyAssignmentsOffset + kPointerSize;
 #if V8_HOST_ARCH_32_BIT
   // Smi fields.
   static const int kLengthOffset =
-      kProfilerTicksOffset + 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 kDeoptCounterOffset = kAstNodeCountOffset + kPointerSize;
+  static const int kProfilerTicksOffset = kDeoptCounterOffset + kPointerSize;
+  static const int kICAgeOffset = kProfilerTicksOffset + kPointerSize;
+
   // Total size.
-  static const int kSize = kDeoptCounterOffset + kPointerSize;
+  static const int kSize = kICAgeOffset + 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.
   static const int kLengthOffset =
-      kProfilerTicksOffset + kPointerSize;
+      kThisPropertyAssignmentsOffset + kPointerSize;
   static const int kFormalParameterCountOffset =
       kLengthOffset + kIntSize;
 
   static const int kExpectedNofPropertiesOffset =
       kFormalParameterCountOffset + kIntSize;
   static const int kNumLiteralsOffset =
       kExpectedNofPropertiesOffset + kIntSize;
 
   static const int kEndPositionOffset =
       kNumLiteralsOffset + kIntSize;
   static const int kStartPositionAndTypeOffset =
       kEndPositionOffset + kIntSize;
 
   static const int kFunctionTokenPositionOffset =
       kStartPositionAndTypeOffset + kIntSize;
   static const int kCompilerHintsOffset =
       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 kProfilerTicksOffset = kDeoptCounterOffset + kIntSize;
+  static const int kICAgeOffset = kProfilerTicksOffset + kIntSize;
+
   // Total size.
-  static const int kSize = kDeoptCounterOffset + kIntSize;
+  static const int kSize = kICAgeOffset + 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 2994 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_