Add tool to visualize machine code/lithium.

src/x64/lithium-x64.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 194 matching lines @@
     return H##type::cast(hydrogen_value()); \
   }
 
 
 class LInstruction : public ZoneObject {
  public:
   LInstruction()
       : environment_(NULL),
         hydrogen_value_(NULL),
         bit_field_(IsCallBits::encode(false)) {
-    set_position(RelocInfo::kNoPosition);
   }
 
   virtual ~LInstruction() {}
 
   virtual void CompileToNative(LCodeGen* generator) = 0;
   virtual const char* Mnemonic() const = 0;
   virtual void PrintTo(StringStream* stream);
   virtual void PrintDataTo(StringStream* stream);
   virtual void PrintOutputOperandTo(StringStream* stream);
 
@@ skipping 20 matching lines @@
   virtual bool IsControl() const { return false; }
 
   void set_environment(LEnvironment* env) { environment_ = env; }
   LEnvironment* environment() const { return environment_; }
   bool HasEnvironment() const { return environment_ != NULL; }
 
   void set_pointer_map(LPointerMap* p) { pointer_map_.set(p); }
   LPointerMap* pointer_map() const { return pointer_map_.get(); }
   bool HasPointerMap() const { return pointer_map_.is_set(); }
 
-  // The 31 bits PositionBits is used to store the int position value. And the
-  // position value may be RelocInfo::kNoPosition (-1). The accessor always
-  // +1/-1 so that the encoded value of position in bit_field_ is always >= 0
-  // and can fit into the 31 bits PositionBits.
-  void set_position(int pos) {
-    bit_field_ = PositionBits::update(bit_field_, pos + 1);
-  }
-  int position() { return PositionBits::decode(bit_field_) - 1; }
-
   void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
   HValue* hydrogen_value() const { return hydrogen_value_; }
 
   void MarkAsCall() { bit_field_ = IsCallBits::update(bit_field_, true); }
   bool IsCall() const { return IsCallBits::decode(bit_field_); }
 
   // Interface to the register allocator and iterators.
   bool ClobbersTemps() const { return IsCall(); }
   bool ClobbersRegisters() const { return IsCall(); }
   virtual bool ClobbersDoubleRegisters() const { return IsCall(); }
@@ skipping 19 matching lines @@
   // Iterator support.
   friend class InputIterator;
   virtual int InputCount() = 0;
   virtual LOperand* InputAt(int i) = 0;
 
   friend class TempIterator;
   virtual int TempCount() = 0;
   virtual LOperand* TempAt(int i) = 0;
 
   class IsCallBits: public BitField<bool, 0, 1> {};
-  class PositionBits: public BitField<int, 1, 31> {};
 
   LEnvironment* environment_;
   SetOncePointer<LPointerMap> pointer_map_;
   HValue* hydrogen_value_;
   int bit_field_;
 };
 
 
 // R = number of result operands (0 or 1).
 // I = number of input operands.
@@ skipping 2229 matching lines @@
       : chunk_(NULL),
         info_(info),
         graph_(graph),
         zone_(graph->zone()),
         status_(UNUSED),
         current_instruction_(NULL),
         current_block_(NULL),
         next_block_(NULL),
         argument_count_(0),
         allocator_(allocator),
-        position_(RelocInfo::kNoPosition),
         instruction_pending_deoptimization_environment_(NULL),
         pending_deoptimization_ast_id_(BailoutId::None()) { }
 
   // Build the sequence for the graph.
   LPlatformChunk* Build();
 
   LInstruction* CheckElideControlInstruction(HControlInstruction* instr);
 
   // Declare methods that deal with the individual node types.
 #define DECLARE_DO(type) LInstruction* Do##type(H##type* node);
@@ skipping 132 matching lines @@
   LPlatformChunk* chunk_;
   CompilationInfo* info_;
   HGraph* const graph_;
   Zone* zone_;
   Status status_;
   HInstruction* current_instruction_;
   HBasicBlock* current_block_;
   HBasicBlock* next_block_;
   int argument_count_;
   LAllocator* allocator_;
-  int position_;
   LInstruction* instruction_pending_deoptimization_environment_;
   BailoutId pending_deoptimization_ast_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_