Count-based profiling for primitive functions (hidden behind a flag)

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 76ac347d32a27e3bd3d2edd56d9f18f5ab61d0f8..cdf4a76cc26eed5c7461c43f02a415d656a625ed 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5206,6 +5206,9 @@ class SharedFunctionInfo: public HeapObject {
   inline int deopt_counter();
   inline void set_deopt_counter(int counter);
 
+  inline int profiler_ticks();
+  inline void set_profiler_ticks(int ticks);
+
   inline int ast_node_count();
   inline void set_ast_node_count(int count);
 
@@ -5381,10 +5384,12 @@ class SharedFunctionInfo: public HeapObject {
       kInferredNameOffset + kPointerSize;
   static const int kThisPropertyAssignmentsOffset =
       kInitialMapOffset + kPointerSize;
+  static const int kProfilerTicksOffset =
+      kThisPropertyAssignmentsOffset + kPointerSize;

[Erik Corry, 2012/02/08 14:09:23]

This is a Smi field.  Can we find another one and put them both in one field on
64 bit like we do for the ones below?

[Jakob Kummerow, 2012/02/08 15:24:08]

I'd love to, but I don't see any other Smi fields. Don't worry, though, there
will be more in the future :-)

 #if V8_HOST_ARCH_32_BIT
   // Smi fields.
   static const int kLengthOffset =
-      kThisPropertyAssignmentsOffset + kPointerSize;
+      kProfilerTicksOffset + kPointerSize;
   static const int kFormalParameterCountOffset = kLengthOffset + kPointerSize;
   static const int kExpectedNofPropertiesOffset =
       kFormalParameterCountOffset + kPointerSize;
@@ -5418,7 +5423,7 @@ class SharedFunctionInfo: public HeapObject {
   // word is not set and thus this word cannot be treated as pointer
   // to HeapObject during old space traversal.
   static const int kLengthOffset =
-      kThisPropertyAssignmentsOffset + kPointerSize;
+      kProfilerTicksOffset + kPointerSize;
   static const int kFormalParameterCountOffset =
       kLengthOffset + kIntSize;