Add a print statement for recompilations.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index 6a5cc5b308c70dc160345c091178acfca2d654ed..ddb89efc73f1e2ae9cac47b8ca5ea69ba1fafc8a 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -58,6 +58,7 @@ DEFINE_FLAG(bool, trace_type_checks, false, "Trace runtime type checks.");
 
 DECLARE_FLAG(int, deoptimization_counter_threshold);
 DECLARE_FLAG(bool, warn_on_javascript_compatibility);
+DECLARE_FLAG(bool, trace_compiler);

[srdjan, 2015/08/31 17:13:56]

Alphabetical sort, please.

[siva, 2015/08/31 20:12:23]

Done.

 
 DEFINE_FLAG(bool, use_osr, true, "Use on-stack replacement.");
 DEFINE_FLAG(bool, trace_osr, false, "Trace attempts at on-stack replacement.");
@@ -1473,6 +1474,12 @@ DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
     // Reset usage counter for reoptimization before calling optimizer to
     // prevent recursive triggering of function optimization.
     function.set_usage_counter(0);
+    if (FLAG_trace_compiler) {
+      if (function.HasOptimizedCode()) {
+        ISL_Print("ReCompiling %sfunction: '%s' \n", "",

[srdjan, 2015/08/31 17:13:56]

Why the first %s ? It is always "" ?

[siva, 2015/08/31 20:12:23]

Done.

+                  function.ToFullyQualifiedCString());
+      }
+    }
     const Error& error = Error::Handle(
         isolate, Compiler::CompileOptimizedFunction(thread, function));
     if (!error.IsNull()) {