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/* Frame unwinder for frames with DWARF Call Frame Information.

   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Mark Kettenis.

   This file is part of GDB.

   This program 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 of the License, or

   (at your option) any later version.

   This program 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.

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

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef DWARF2_FRAME_H

#define DWARF2_FRAME_H 1

struct gdbarch;

struct objfile;

struct frame_info;

/* Register rule.  */

enum dwarf2_frame_reg_rule

{

  /* Make certain that 0 maps onto the correct enum value; the

     corresponding structure is being initialized using memset zero.

     This indicates that CFI didn't provide any information at all

     about a register, leaving how to obtain its value totally

     unspecified.  */

  DWARF2_FRAME_REG_UNSPECIFIED = 0,

  /* The term "undefined" comes from the DWARF2 CFI spec which this

     code is moddeling; it indicates that the register's value is

     "undefined".  GCC uses the less formal term "unsaved".  Its

     definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED.

     The failure to differentiate the two helps explain a few problems

     with the CFI generated by GCC.  */

  DWARF2_FRAME_REG_UNDEFINED,

  DWARF2_FRAME_REG_SAVED_OFFSET,

  DWARF2_FRAME_REG_SAVED_REG,

  DWARF2_FRAME_REG_SAVED_EXP,

  DWARF2_FRAME_REG_SAME_VALUE,

  /* These are defined in Dwarf3.  */

  DWARF2_FRAME_REG_SAVED_VAL_OFFSET,

  DWARF2_FRAME_REG_SAVED_VAL_EXP,

  /* These aren't defined by the DWARF2 CFI specification, but are

     used internally by GDB.  */

  DWARF2_FRAME_REG_FN,          /* Call a registered function.  */

  DWARF2_FRAME_REG_RA,          /* Return Address.  */

  DWARF2_FRAME_REG_RA_OFFSET,   /* Return Address with offset.  */

  DWARF2_FRAME_REG_CFA,         /* Call Frame Address.  */

  DWARF2_FRAME_REG_CFA_OFFSET   /* Call Frame Address with offset.  */

};

/* Register state.  */

struct dwarf2_frame_state_reg

{

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

     another register, or a location expression.  */

  union {

    LONGEST offset;

    ULONGEST reg;

    const gdb_byte *exp;

    struct value *(*fn) (struct frame_info *this_frame, void **this_cache,

                         int regnum);

  } loc;

  ULONGEST exp_len;

  enum dwarf2_frame_reg_rule how;

};

/* Set the architecture-specific register state initialization

   function for GDBARCH to INIT_REG.  */

extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch,

                                       void (*init_reg) (struct gdbarch *, int,

                                             struct dwarf2_frame_state_reg *,

                                             struct frame_info *));

/* Set the architecture-specific signal trampoline recognition

   function for GDBARCH to SIGNAL_FRAME_P.  */

extern void

  dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,

                                   int (*signal_frame_p) (struct gdbarch *,

                                                          struct frame_info *));

/* Set the architecture-specific adjustment of .eh_frame and .debug_frame

   register numbers.  */

extern void

  dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,

                                  int (*adjust_regnum) (struct gdbarch *,

                                                        int, int));

/* Append the DWARF-2 frame unwinders to GDBARCH's list.  */

void dwarf2_append_unwinders (struct gdbarch *gdbarch);

/* Return the frame base methods for the function that contains PC, or

   NULL if it can't be handled by the DWARF CFI frame unwinder.  */

extern const struct frame_base *

  dwarf2_frame_base_sniffer (struct frame_info *this_frame);

/* Register the DWARF CFI for OBJFILE.  */

void dwarf2_frame_build_info (struct objfile *objfile);

/* Compute the DWARF CFA for a frame.  */

CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame);

#endif /* dwarf2-frame.h */