Add a print statement for recompilations.

runtime/vm/code_generator.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 39 matching lines @@
 DEFINE_FLAG(bool, trace_ic, false, "Trace IC handling");
 DEFINE_FLAG(bool, trace_ic_miss_in_optimized, false,
     "Trace IC miss in optimized code");
 DEFINE_FLAG(bool, trace_optimized_ic_calls, false,
     "Trace IC calls in optimized code.");
 DEFINE_FLAG(bool, trace_patching, false, "Trace patching of code.");
 DEFINE_FLAG(bool, trace_runtime_calls, false, "Trace runtime calls");
 DEFINE_FLAG(bool, trace_type_checks, false, "Trace runtime type checks.");
 
 DECLARE_FLAG(int, deoptimization_counter_threshold);
+DECLARE_FLAG(bool, trace_compiler);
 DECLARE_FLAG(bool, warn_on_javascript_compatibility);
 
 DEFINE_FLAG(bool, use_osr, true, "Use on-stack replacement.");
 DEFINE_FLAG(bool, trace_osr, false, "Trace attempts at on-stack replacement.");
 
 DEFINE_FLAG(int, stacktrace_every, 0,
             "Compute debugger stacktrace on every N stack overflow checks");
 DEFINE_FLAG(charp, stacktrace_filter, NULL,
             "Compute stacktrace in named function on stack overflow checks");
 DEFINE_FLAG(int, deoptimize_every, 0,
@@ skipping 1396 matching lines @@
 DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
   const Function& function = Function::CheckedHandle(zone,
                                                      arguments.ArgAt(0));
   ASSERT(!function.IsNull());
   ASSERT(function.HasCode());
 
   if (CanOptimizeFunction(function, isolate)) {
     // 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 function: '%s' \n",
+                  function.ToFullyQualifiedCString());
+      }
+    }
     const Error& error = Error::Handle(
         isolate, Compiler::CompileOptimizedFunction(thread, function));
     if (!error.IsNull()) {
       Exceptions::PropagateError(error);
     }
     const Code& optimized_code = Code::Handle(isolate, function.CurrentCode());
     ASSERT(!optimized_code.IsNull());
   }
   arguments.SetReturn(Code::Handle(isolate, function.CurrentCode()));
 }
@@ skipping 362 matching lines @@
   const intptr_t elm_size = old_data.ElementSizeInBytes();
   const TypedData& new_data =
       TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
   TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
   typed_data_cell.SetAt(0, new_data);
   arguments.SetReturn(new_data);
 }
 
 
 }  // namespace dart