Print reason for disabling optimization. Kill --trace-bailout flag.

src/compiler.h

 // Copyright 2012 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 166 matching lines @@
     deferred_handles_ = deferred_handles;
   }
 
   void SaveHandles() {
     SaveHandle(&closure_);
     SaveHandle(&shared_info_);
     SaveHandle(&calling_context_);
     SaveHandle(&script_);
   }
 
+  const char* bailout_reason() const { return bailout_reason_; }
+  void set_bailout_reason(const char* reason) { bailout_reason_ = reason; }
+
  private:
   Isolate* isolate_;
 
   // Compilation mode.
   // BASE is generated by the full codegen, optionally prepared for bailouts.
   // OPTIMIZE is optimized code generated by the Hydrogen-based backend.
   // NONOPT is generated by the full codegen and is not prepared for
   //   recompilation/bailouts.  These functions are never recompiled.
   enum Mode {
     BASE,
     OPTIMIZE,
     NONOPT
   };
 
   void Initialize(Mode mode) {
     mode_ = V8::UseCrankshaft() ? mode : NONOPT;
     ASSERT(!script_.is_null());
     if (script_->type()->value() == Script::TYPE_NATIVE) {
       MarkAsNative();
     }
     if (!shared_info_.is_null()) {
       ASSERT(language_mode() == CLASSIC_MODE);
       SetLanguageMode(shared_info_->language_mode());
     }
+    set_bailout_reason("unknown");
   }
 
   void SetMode(Mode mode) {
     ASSERT(V8::UseCrankshaft());
     mode_ = mode;
   }
 
   // Flags using template class BitField<type, start, length>.  All are
   // false by default.
   //
@@ skipping 52 matching lines @@
   DeferredHandles* deferred_handles_;
 
   template<typename T>
   void SaveHandle(Handle<T> *object) {
     if (!object->is_null()) {
       Handle<T> handle(*(*object));
       *object = handle;
     }
   }
 
+  const char* bailout_reason_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };
 
 
 // Exactly like a CompilationInfo, except also creates and enters a
 // Zone on construction and deallocates it on exit.
 class CompilationInfoWithZone: public CompilationInfo {
  public:
   explicit CompilationInfoWithZone(Handle<Script> script)
       : CompilationInfo(script, &zone_),
@@ skipping 60 matching lines @@
 
   MUST_USE_RESULT Status CreateGraph();
   MUST_USE_RESULT Status OptimizeGraph();
   MUST_USE_RESULT Status GenerateAndInstallCode();
 
   Status last_status() const { return last_status_; }
   CompilationInfo* info() const { return info_; }
 
   MUST_USE_RESULT Status AbortOptimization() {
     info_->AbortOptimization();
-    info_->shared_info()->DisableOptimization();
+    info_->shared_info()->DisableOptimization(info_->bailout_reason());
     return SetLastStatus(BAILED_OUT);
   }
 
  private:
   CompilationInfo* info_;
   TypeFeedbackOracle* oracle_;
   HGraphBuilder* graph_builder_;
   HGraph* graph_;
   LChunk* chunk_;
   int64_t time_taken_to_create_graph_;
@@ skipping 88 matching lines @@
 
   static void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
                                         CompilationInfo* info,
                                         Handle<SharedFunctionInfo> shared);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_