Implemented function that returns code age.

src/objects.cc

 // Copyright 2013 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 10281 matching lines @@
 byte* Code::FindCodeAgeSequence() {
   return FLAG_age_code &&
       prologue_offset() != kPrologueOffsetNotSet &&
       (kind() == OPTIMIZED_FUNCTION ||
        (kind() == FUNCTION && !has_debug_break_slots()))
       ? instruction_start() + prologue_offset()
       : NULL;
 }
 
 
+int Code::GetAge() {
+  byte* sequence = FindCodeAgeSequence();
+  if (sequence == NULL) {
+    return Code::kNoAge;
+  }
+  Age age;
+  MarkingParity parity;
+  GetCodeAgeAndParity(sequence, &age, &parity);
+  return age;
+}
+
+
 void Code::GetCodeAgeAndParity(Code* code, Age* age,
                                MarkingParity* parity) {
   Isolate* isolate = Isolate::Current();
   Builtins* builtins = isolate->builtins();
   Code* stub = NULL;
 #define HANDLE_CODE_AGE(AGE)                                            \
   stub = *builtins->Make##AGE##CodeYoungAgainEvenMarking();             \
   if (code == stub) {                                                   \
     *age = k##AGE##CodeAge;                                             \
     *parity = EVEN_MARKING_PARITY;                                      \
@@ skipping 5392 matching lines @@
 
 
 void JSTypedArray::Neuter() {
   set_byte_offset(Smi::FromInt(0));
   set_byte_length(Smi::FromInt(0));
   set_length(Smi::FromInt(0));
   set_elements(GetHeap()->EmptyExternalArrayForMap(map()));
 }
 
 } }  // namespace v8::internal