Defer the writing of the source position data to the relocation information...

src/assembler-arm.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 627 matching lines @@
 
   // 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);
 
   int pc_offset() const { return pc_ - buffer_; }
   int last_position() const { return last_position_; }
-  bool last_position_is_statement() const {
-    return last_position_is_statement_;
-  }
+  int last_statement_position() const { return last_statement_position_; }
 
  protected:
   int buffer_space() const { return reloc_info_writer.pos() - pc_; }
 
   // Read/patch instructions
   Instr instr_at(byte* pc) { return *reinterpret_cast<Instr*>(pc); }
   void instr_at_put(byte* pc, Instr instr) {
     *reinterpret_cast<Instr*>(pc) = instr;
   }
   Instr instr_at(int pos) { return *reinterpret_cast<Instr*>(buffer_ + pos); }
@@ skipping 79 matching lines @@
 
   // Jump-to-jump elimination:
   // The last label to be bound to _binding_pos, if unbound.
   Label unbound_label_;
   // The position to which _unbound_label has to be bound, if present.
   int binding_pos_;
   // The position before which jumps cannot be eliminated.
   int last_bound_pos_;
 
   // source position information
+  int last_statement_position_;
   int last_position_;
-  bool last_position_is_statement_;
 
   // Code emission
   inline void CheckBuffer();
   void GrowBuffer();
   inline void emit(Instr x);
 
   // Instruction generation
   void addrmod1(Instr instr, Register rn, Register rd, const Operand& x);
   void addrmod2(Instr instr, Register rd, const MemOperand& x);
   void addrmod3(Instr instr, Register rd, const MemOperand& x);
@@ skipping 14 matching lines @@
 
   // Block the emission of the constant pool before pc_offset
   void BlockConstPoolBefore(int pc_offset) {
     if (no_const_pool_before_ < pc_offset) no_const_pool_before_ = pc_offset;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_ARM_H_