Log deopts with --log-timer-events.

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 698 matching lines @@
 // We rely on this function not causing a GC.  It is called from generated code
 // without having a real stack frame in place.
 void Deoptimizer::DoComputeOutputFrames() {
   if (bailout_type_ == OSR) {
     DoComputeOsrOutputFrame();
     return;
   }
 
   // Print some helpful diagnostic information.
   int64_t start = OS::Ticks();
+  if (FLAG_log_timer_events &&
+      compiled_code_->kind() == Code::OPTIMIZED_FUNCTION) {
+    LOG(isolate(), CodeDeoptEvent(compiled_code_));
+  }
   if (trace_) {
     PrintF("[deoptimizing (DEOPT %s): begin 0x%08" V8PRIxPTR " ",
            MessageFor(bailout_type_),
            reinterpret_cast<intptr_t>(function_));
     PrintFunctionName();
     PrintF(" @%d, FP to SP delta: %d]\n", bailout_id_, fp_to_sp_delta_);
     if (bailout_type_ == EAGER || bailout_type_ == SOFT) {
       compiled_code_->PrintDeoptLocation(bailout_id_);
     }
   }
@@ skipping 2382 matching lines @@
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(BitCast<Object**>(&function_));
   v->VisitPointers(parameters_, parameters_ + parameters_count_);
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal