Fix printing of deoptimized function.

runtime/vm/deopt_instructions.cc

 // Copyright (c) 2012, 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/deopt_instructions.h"
 
 #include "vm/assembler_macros.h"
 #include "vm/code_patcher.h"
 #include "vm/intermediate_language.h"
 #include "vm/locations.h"
 #include "vm/parser.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, compress_deopt_info, true,
             "Compress the size of the deoptimization info for optimized code.");
+DECLARE_FLAG(bool, trace_deoptimization);
 
 DeoptimizationContext::DeoptimizationContext(intptr_t* to_frame_start,
                                              intptr_t to_frame_size,
                                              const Array& object_table,
                                              intptr_t num_args,
                                              DeoptReasonId deopt_reason)
     : object_table_(object_table),
       to_frame_(to_frame_start),
       to_frame_size_(to_frame_size),
       from_frame_(NULL),
@@ skipping 409 matching lines @@
     const Code& code =
         Code::Handle(deopt_context->isolate(), function.unoptimized_code());
     ASSERT(!code.IsNull());
     intptr_t pc_marker = code.EntryPoint() +
                          AssemblerMacros::kOffsetOfSavedPCfromEntrypoint;
     intptr_t* to_addr = deopt_context->GetToFrameAddressAt(to_index);
     *to_addr = pc_marker;
     // Increment the deoptimization counter. This effectively increments each
     // function occurring in the optimized frame.
     function.set_deoptimization_counter(function.deoptimization_counter() + 1);
+    if (FLAG_trace_deoptimization) {
+      OS::PrintErr("Deoptimizing inlined %s (count %d)\n",
+          function.ToFullyQualifiedCString(),
+          function.deoptimization_counter());
+    }
     // Clear invocation counter so that hopefully the function gets reoptimized
     // only after more feedback has been collected.
     function.set_usage_counter(0);
     if (function.HasOptimizedCode()) function.SwitchToUnoptimizedCode();
   }
 
  private:
   intptr_t object_table_index_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptPcMarkerInstr);
@@ skipping 338 matching lines @@
                           Smi* offset,
                           DeoptInfo* info,
                           Smi* reason) {
   intptr_t i = index * kEntrySize;
   *offset ^= table.At(i);
   *info ^= table.At(i + 1);
   *reason ^= table.At(i + 2);
 }
 
 }  // namespace dart