Add deoptimization history to optimized functions.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
===================================================================
--- runtime/vm/compiler.cc	(revision 23072)
+++ runtime/vm/compiler.cc	(working copy)
@@ -373,6 +373,14 @@
                     Code::Handle(function.unoptimized_code()).EntryPoint());
         }
 
+        // If not yet present, allocate deoptimization history array.
+        const Array& deopt_history = Array::Handle(function.deopt_history());

[Kevin Millikin (Google), 2013/05/24 11:39:21]

You can use just one handle here.

Array& deopt_history = Array::Handle(function.deopt_history());
if (deopt_history.IsNull()) {
  deopt_history = Array::New(...);
  function.set_deopt_history(deopt_history);
}

[Florian Schneider, 2013/05/24 11:53:02]

Done.

+        if (deopt_history.IsNull()) {
+          const Array& array =
+              Array::Handle(Array::New(FLAG_deoptimization_counter_threshold));
+          function.set_deopt_history(array);
+        }
+
         for (intptr_t i = 0; i < guarded_fields.length(); i++) {
           const Field& field = *guarded_fields[i];
           field.RegisterDependentCode(code);