Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/code-stubs.h

 // Copyright 2006-2008 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 57 matching lines @@
   CODE_STUB_LIST_ALL(V)    \
   CODE_STUB_LIST_ARM(V)
 
 // Stub is base classes of all stubs.
 class CodeStub BASE_EMBEDDED {
  public:
   enum Major {
 #define DEF_ENUM(name) name,
     CODE_STUB_LIST(DEF_ENUM)
 #undef DEF_ENUM
+    NoCache,  // marker for stubs that do custom caching
     NUMBER_OF_IDS
   };
 
   // Retrieve the code for the stub. Generate the code if needed.
   Handle<Code> GetCode();
 
   static Major MajorKeyFromKey(uint32_t key) {
     return static_cast<Major>(MajorKeyBits::decode(key));
   };
   static int MinorKeyFromKey(uint32_t key) {
     return MinorKeyBits::decode(key);
   };
   static const char* MajorName(Major major_key);
 
   virtual ~CodeStub() {}
 
+  // Override these methods to provide a custom caching mechanism for
+  // an individual type of code stub.
+  virtual bool GetCustomCache(Code** code_out) { return false; }
+  virtual void SetCustomCache(Code* value) { }
+  virtual bool has_custom_cache() { return false; }
+
  protected:
   static const int kMajorBits = 5;
   static const int kMinorBits = kBitsPerInt - kSmiTagSize - kMajorBits;
 
  private:
   // Generates the assembler code for the stub.
   virtual void Generate(MacroAssembler* masm) = 0;
 
   // Returns information for computing the number key.
   virtual Major MajorKey() = 0;
@@ skipping 21 matching lines @@
 
   class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {};
   class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {};
 
   friend class BreakPointIterator;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_