Improve positions recording for calls.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1156 matching lines @@
   // Mark address of the ExitJSFrame code.
   void RecordJSReturn();
 
   // Mark address of a debug break slot.
   void RecordDebugBreakSlot();
 
   // Record a comment relocation entry that can be used by a disassembler.
   // Use --debug_code to enable.
   void RecordComment(const char* msg);
 
-  void RecordPosition(int pos);
-  void RecordStatementPosition(int pos);
-  bool WriteRecordedPositions();
+  int pc_offset() const { return static_cast<int>(pc_ - buffer_); }
 
-  int pc_offset() const { return static_cast<int>(pc_ - buffer_); }
-  int current_statement_position() const { return current_statement_position_; }
-  int current_position() const { return current_position_; }
+  PositionsRecorder* positions_recorder() { return &positions_recorder_; }
 
   // Check if there is less than kGap bytes available in the buffer.
   // If this is the case, we need to grow the buffer before emitting
   // an instruction or relocation information.
   inline bool buffer_overflow() const {
     return pc_ >= reloc_info_writer.pos() - kGap;
   }
 
   // Get the number of bytes available in the buffer.
   inline int available_space() const {
@@ skipping 203 matching lines @@
   static byte* spare_buffer_;
 
   // code generation
   byte* pc_;  // the program counter; moves forward
   RelocInfoWriter reloc_info_writer;
 
   List< Handle<Code> > code_targets_;
   // push-pop elimination
   byte* last_pc_;
 
-  // source position information
-  int current_statement_position_;
-  int current_position_;
-  int written_statement_position_;
-  int written_position_;
+  PositionsRecorder positions_recorder_;
+  friend class PositionsRecorder;
 };
 
 
 // Helper class that ensures that there is enough space for generating
 // instructions and relocation information.  The constructor makes
 // sure that there is enough space and (in debug mode) the destructor
 // checks that we did not generate too much.
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) : assembler_(assembler) {
@@ skipping 13 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_