Count per check hits in ICData.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index a388cb196046393ff7cc1f2615474c352a0fa45f..67e71e294dac109cd2a3d5659cfa3f383dad9add 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -2853,7 +2853,8 @@ class ICData : public Object {
 
   void GetCheckAt(intptr_t index,
                   GrowableArray<intptr_t>* class_ids,
-                  Function* target) const;
+                  Function* target,
+                  intptr_t* count = NULL) const;

[srdjan, 2012/11/13 20:58:14]

Maybe it is OK if this method remains unchanged and use GetCountAt to access
counts?

[Kevin Millikin (Google), 2012/11/13 20:59:33]

I'm not thrilled with the default parameter.  It looks like some call sites
don't use target either, but we always pass it.  So it's at least inconsistent
this way.

[Vyacheslav Egorov (Google), 2012/12/17 12:54:16]

Done.

   void GetOneClassCheckAt(intptr_t index,
                           intptr_t* class_id,
                           Function* target) const;
@@ -2863,6 +2864,8 @@ class ICData : public Object {
   RawFunction* GetTargetAt(intptr_t index) const;
   RawFunction* GetTargetForReceiverClassId(intptr_t class_id) const;
 
+  intptr_t GetCountAt(intptr_t index) const;
+
   // Returns this->raw() if num_args_tested == 1 and arg_nr == 1, otherwise
   // returns a new ICData object containing only unique arg_nr checks.
   RawICData* AsUnaryClassChecksForArgNr(intptr_t arg_nr) const;
@@ -2879,6 +2882,16 @@ class ICData : public Object {
                         intptr_t deopt_id,
                         intptr_t num_args_tested);
 
+  static intptr_t TestEntryLengthFor(intptr_t num_args);
+
+  static intptr_t TargetIndexFor(intptr_t num_args) {

[Kevin Millikin (Google), 2012/11/13 20:59:33]

Not an Index, but an Offset (from the beginning of the entry).

[Vyacheslav Egorov (Google), 2012/12/17 12:54:16]

Done.

+    return num_args;
+  }
+
+  static intptr_t CountIndexFor(intptr_t num_args) {
+    return num_args + 1;
+  }
+
  private:
   RawArray* ic_data() const {
     return raw_ptr()->ic_data_;