Implemented function that returns code age.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index dc2db4b096b76ddb7c36532a51be7106c9b6838b..3a4c0c4664b1f685e84a345374b9ace17ffeb706 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -1004,7 +1004,8 @@ void CodeFlusher::ProcessJSFunctionCandidates() {
     if (!code_mark.Get()) {
       if (FLAG_trace_code_flushing && shared->is_compiled()) {
         SmartArrayPointer<char> name = shared->DebugName()->ToCString();
-        PrintF("[code-flushing clears: %s]\n", *name);
+        int age = FLAG_age_code ? code->GetAge() : shared->code_age();
+        PrintF("[code-flushing clears: %s - age: %d]\n", *name, age);

[Michael Starzinger, 2013/06/11 17:30:07]

Won't this age be constant since we at a certain age and the code-flusher should
be active all the time in normal execution (i.e. without attached debugger)
anyways?

[Hannes Payer (out of office), 2013/06/12 08:56:32]

True, an assert is more appropriate.

       }
       shared->set_code(lazy_compile);
       candidate->set_code(lazy_compile);
@@ -1045,7 +1046,8 @@ void CodeFlusher::ProcessSharedFunctionInfoCandidates() {
     if (!code_mark.Get()) {
       if (FLAG_trace_code_flushing && candidate->is_compiled()) {
         SmartArrayPointer<char> name = candidate->DebugName()->ToCString();
-        PrintF("[code-flushing clears: %s]\n", *name);
+        int age = FLAG_age_code ? code->GetAge() : candidate->code_age();
+        PrintF("[code-flushing clears: %s - age: %d]\n", *name, age);
       }
       candidate->set_code(lazy_compile);
     }
@@ -1132,7 +1134,10 @@ void CodeFlusher::EvictCandidate(SharedFunctionInfo* shared_info) {
 
   if (FLAG_trace_code_flushing) {
     SmartArrayPointer<char> name = shared_info->DebugName()->ToCString();
-    PrintF("[code-flushing abandons function-info: %s]\n", *name);
+    int age = FLAG_age_code ?
+        shared_info->code()->GetAge() : shared_info->code_age();
+    PrintF("[code-flushing abandons function-info: %s - age: %d]\n",
+        *name, age);
   }
 
   SharedFunctionInfo* candidate = shared_function_info_candidates_head_;
@@ -1168,7 +1173,9 @@ void CodeFlusher::EvictCandidate(JSFunction* function) {
 
   if (FLAG_trace_code_flushing) {
     SmartArrayPointer<char> name = function->shared()->DebugName()->ToCString();
-    PrintF("[code-flushing abandons closure: %s]\n", *name);
+    int age = FLAG_age_code ?
+        function->shared()->code()->GetAge() : function->shared()->code_age();
+    PrintF("[code-flushing abandons closure: %s - age: %d]\n", *name, age);
   }
 
   JSFunction* candidate = jsfunction_candidates_head_;