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/* DWARF2 frame unwind data structure.

   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2009

   Free Software Foundation, Inc.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   GCC is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public

   License for more details.

   Under Section 7 of GPL version 3, you are granted additional

   permissions described in the GCC Runtime Library Exception, version

   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and

   a copy of the GCC Runtime Library Exception along with this program;

   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

   <http://www.gnu.org/licenses/>.  */

/* A target can override (perhaps for backward compatibility) how

   many dwarf2 columns are unwound.  */

#ifndef DWARF_FRAME_REGISTERS

#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER

#endif

/* The result of interpreting the frame unwind info for a frame.

   This is all symbolic at this point, as none of the values can

   be resolved until the target pc is located.  */

typedef struct

{

  /* Each register save state can be described in terms of a CFA slot,

     another register, or a location expression.  */

  struct frame_state_reg_info

  {

    struct {

      union {

        _Unwind_Word reg;

        _Unwind_Sword offset;

        const unsigned char *exp;

      } loc;

      enum {

        REG_UNSAVED,

        REG_SAVED_OFFSET,

        REG_SAVED_REG,

        REG_SAVED_EXP,

        REG_SAVED_VAL_OFFSET,

        REG_SAVED_VAL_EXP,

        REG_UNDEFINED

      } how;

    } reg[DWARF_FRAME_REGISTERS+1];

    /* Used to implement DW_CFA_remember_state.  */

    struct frame_state_reg_info *prev;

    /* The CFA can be described in terms of a reg+offset or a

       location expression.  */

    _Unwind_Sword cfa_offset;

    _Unwind_Word cfa_reg;

    const unsigned char *cfa_exp;

    enum {

      CFA_UNSET,

      CFA_REG_OFFSET,

      CFA_EXP

    } cfa_how;

  } regs;

  /* The PC described by the current frame state.  */

  void *pc;

  /* The information we care about from the CIE/FDE.  */

  _Unwind_Personality_Fn personality;

  _Unwind_Sword data_align;

  _Unwind_Word code_align;

  _Unwind_Word retaddr_column;

  unsigned char fde_encoding;

  unsigned char lsda_encoding;

  unsigned char saw_z;

  unsigned char signal_frame;

  void *eh_ptr;

} _Unwind_FrameState;