Short term JSON eval cache

src/compilation-cache.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 26 matching lines @@
 // different compiled code for scripts and evals, we use separate sub-caches
 // for different compilation modes, to avoid retrieving the wrong result.
 class CompilationSubCache {
  public:
   CompilationSubCache(Isolate* isolate, int generations)
       : isolate_(isolate),
         generations_(generations) {
     tables_ = NewArray<Object*>(generations);
   }
 
-  ~CompilationSubCache() { DeleteArray(tables_); }
+  virtual ~CompilationSubCache() { DeleteArray(tables_); }
 
   // Index for the first generation in the cache.
   static const int kFirstGeneration = 0;
 
   // Get the compilation cache tables for a specific generation.
   Handle<CompilationCacheTable> GetTable(int generation);
 
   // Accessors for first generation.
   Handle<CompilationCacheTable> GetFirstTable() {
     return GetTable(kFirstGeneration);
   }
   void SetFirstTable(Handle<CompilationCacheTable> value) {
     ASSERT(kFirstGeneration < generations_);
     tables_[kFirstGeneration] = *value;
   }
 
   // Age the sub-cache by evicting the oldest generation and creating a new
   // young generation.
   void Age();
 
   // GC support.
-  void Iterate(ObjectVisitor* v);
-  void IterateFunctions(ObjectVisitor* v);
+  virtual void Iterate(ObjectVisitor* v);
+  virtual void IterateFunctions(ObjectVisitor* v);
 
   // Clear this sub-cache evicting all its content.
-  void Clear();
+  virtual void Clear();
+  // Clear out any short term elements. Returns true if the cache is
+  // already cleared.
+  virtual bool ClearShortTerm() { return true; }
 
   // Remove given shared function info from sub-cache.
-  void Remove(Handle<SharedFunctionInfo> function_info);
+  virtual void Remove(Handle<SharedFunctionInfo> function_info);
 
   // Number of generations in this sub-cache.
   inline int generations() { return generations_; }
 
  protected:
   Isolate* isolate() { return isolate_; }
 
  private:
   Isolate* isolate_;
   int generations_;  // Number of generations.
@@ skipping 50 matching lines @@
 // 3. Whether the source should be compiled as strict code or as non-strict
 //    code.
 //    Note: Currently there are clients of CompileEval that always compile
 //    non-strict code even if the calling function is a strict mode function.
 //    More specifically these are the CompileString, DebugEvaluate and
 //    DebugEvaluateGlobal runtime functions.
 // 4. The start position of the calling scope.
 class CompilationCacheEval: public CompilationSubCache {
  public:
   CompilationCacheEval(Isolate* isolate, int generations)
-      : CompilationSubCache(isolate, generations) { }
+      : CompilationSubCache(isolate, generations),
+        json_table_(NULL) { }
 
   Handle<SharedFunctionInfo> Lookup(Handle<String> source,
                                     Handle<Context> context,
                                     LanguageMode language_mode,
                                     int scope_position);
 
   void Put(Handle<String> source,
            Handle<Context> context,
            Handle<SharedFunctionInfo> function_info,
            int scope_position);
 
+  virtual void Iterate(ObjectVisitor* v);
+  virtual void IterateFunctions(ObjectVisitor* v);
+  virtual void Clear();
+  virtual bool ClearShortTerm();
+  virtual void Remove(Handle<SharedFunctionInfo> function_info);
+
+  void GetShortTermStatistics(int* entry_count,
+                              int* max_entries,
+                              int* total_size,
+                              int* max_total_size);
+
  private:
   MUST_USE_RESULT MaybeObject* TryTablePut(
       Handle<String> source,
       Handle<Context> context,
       Handle<SharedFunctionInfo> function_info,
       int scope_position);
 
   // Note: Returns a new hash table if operation results in expansion.
-  Handle<CompilationCacheTable> TablePut(
+  void TablePut(
       Handle<String> source,
       Handle<Context> context,
       Handle<SharedFunctionInfo> function_info,
       int scope_position);
 
+  Object* json_table_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheEval);
 };
 
 
 // Sub-cache for regular expressions.
 class CompilationCacheRegExp: public CompilationSubCache {
  public:
   CompilationCacheRegExp(Isolate* isolate, int generations)
       : CompilationSubCache(isolate, generations) { }
 
@@ skipping 59 matching lines @@
                Handle<SharedFunctionInfo> function_info,
                int scope_position);
 
   // Associate the (source, flags) pair to the given regexp data.
   // This may overwrite an existing mapping.
   void PutRegExp(Handle<String> source,
                  JSRegExp::Flags flags,
                  Handle<FixedArray> data);
 
   // Clear the cache - also used to initialize the cache at startup.
-  void Clear();
+  virtual void Clear();
+  // Clear any short term elements. Returns true if the cache is already clear.
+  virtual bool ClearShortTerm();
 
   // Remove given shared function info from all caches.
   void Remove(Handle<SharedFunctionInfo> function_info);
 
   // GC support.
   void Iterate(ObjectVisitor* v);
   void IterateFunctions(ObjectVisitor* v);
 
   // Notify the cache that a mark-sweep garbage collection is about to
   // take place. This is used to retire entries from the cache to
   // avoid keeping them alive too long without using them.
   void MarkCompactPrologue();
 
   // Enable/disable compilation cache. Used by debugger to disable compilation
   // cache during debugging to make sure new scripts are always compiled.
   void Enable();
   void Disable();
 
+  void GetShortTermEvalStatistics(int* entry_count,
+                                  int* max_entries,
+                                  int* total_size,
+                                  int* max_total_size);
+
  private:
   explicit CompilationCache(Isolate* isolate);
-  ~CompilationCache();
+  virtual ~CompilationCache();
 
   HashMap* EagerOptimizingSet();
 
   // The number of sub caches covering the different types to cache.
   static const int kSubCacheCount = 4;
 
   bool IsEnabled() { return FLAG_compilation_cache && enabled_; }
 
   Isolate* isolate() { return isolate_; }
 
@@ skipping 10 matching lines @@
 
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationCache);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILATION_CACHE_H_