Changing the aging mechanism for script and eval caches.

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 7919 matching lines @@
     return key->HashForObject(object);
   }
 
   static inline Handle<Object> AsHandle(Isolate* isolate, HashTableKey* key);
 
   static const int kPrefixSize = 0;
   static const int kEntrySize = 2;
 };
 
 
 class CompilationCacheTable: public HashTable<CompilationCacheTable,

[ulan, 2014/10/30 09:25:49]

Could you please add few words describing state changes of (key, value) entry
with put, age, and lookup operations?

                                               CompilationCacheShape,
                                               HashTableKey*> {
  public:
   // Find cached value for a string key, otherwise return null.
   Handle<Object> Lookup(Handle<String> src, Handle<Context> context);
   Handle<Object> LookupEval(Handle<String> src,
                             Handle<SharedFunctionInfo> shared,
                             StrictMode strict_mode, int scope_position);
   Handle<Object> LookupRegExp(Handle<String> source, JSRegExp::Flags flags);
   static Handle<CompilationCacheTable> Put(
       Handle<CompilationCacheTable> cache, Handle<String> src,
       Handle<Context> context, Handle<Object> value);
   static Handle<CompilationCacheTable> PutEval(
       Handle<CompilationCacheTable> cache, Handle<String> src,
       Handle<SharedFunctionInfo> context, Handle<SharedFunctionInfo> value,
       int scope_position);
   static Handle<CompilationCacheTable> PutRegExp(
       Handle<CompilationCacheTable> cache, Handle<String> src,
       JSRegExp::Flags flags, Handle<FixedArray> value);
   void Remove(Object* value);
+  void Age();
 
   DECLARE_CAST(CompilationCacheTable)
 
  private:
+  static const int kHashGenerations = 10;
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheTable);
 };
 
 
 class CodeCache: public Struct {
  public:
   DECL_ACCESSORS(default_cache, FixedArray)
   DECL_ACCESSORS(normal_type_cache, Object)
 
   // Add the code object to the cache.
@@ skipping 2934 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_