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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [dwarf2-frame.h] - Blame information for rev 227

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1 227 jeremybenn
/* Frame unwinder for frames with DWARF Call Frame Information.
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   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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   Contributed by Mark Kettenis.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#ifndef DWARF2_FRAME_H
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#define DWARF2_FRAME_H 1
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struct gdbarch;
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struct objfile;
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struct frame_info;
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/* Register rule.  */
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enum dwarf2_frame_reg_rule
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{
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  /* Make certain that 0 maps onto the correct enum value; the
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     corresponding structure is being initialized using memset zero.
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     This indicates that CFI didn't provide any information at all
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     about a register, leaving how to obtain its value totally
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     unspecified.  */
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  DWARF2_FRAME_REG_UNSPECIFIED = 0,
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  /* The term "undefined" comes from the DWARF2 CFI spec which this
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     code is moddeling; it indicates that the register's value is
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     "undefined".  GCC uses the less formal term "unsaved".  Its
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     definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED.
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     The failure to differentiate the two helps explain a few problems
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     with the CFI generated by GCC.  */
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  DWARF2_FRAME_REG_UNDEFINED,
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  DWARF2_FRAME_REG_SAVED_OFFSET,
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  DWARF2_FRAME_REG_SAVED_REG,
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  DWARF2_FRAME_REG_SAVED_EXP,
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  DWARF2_FRAME_REG_SAME_VALUE,
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  /* These are defined in Dwarf3.  */
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  DWARF2_FRAME_REG_SAVED_VAL_OFFSET,
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  DWARF2_FRAME_REG_SAVED_VAL_EXP,
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  /* These aren't defined by the DWARF2 CFI specification, but are
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     used internally by GDB.  */
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  DWARF2_FRAME_REG_FN,          /* Call a registered function.  */
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  DWARF2_FRAME_REG_RA,          /* Return Address.  */
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  DWARF2_FRAME_REG_RA_OFFSET,   /* Return Address with offset.  */
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  DWARF2_FRAME_REG_CFA,         /* Call Frame Address.  */
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  DWARF2_FRAME_REG_CFA_OFFSET   /* Call Frame Address with offset.  */
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};
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/* Register state.  */
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struct dwarf2_frame_state_reg
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{
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  /* Each register save state can be described in terms of a CFA slot,
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     another register, or a location expression.  */
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  union {
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    LONGEST offset;
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    ULONGEST reg;
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    unsigned char *exp;
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    struct value *(*fn) (struct frame_info *this_frame, void **this_cache,
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                         int regnum);
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  } loc;
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  ULONGEST exp_len;
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  enum dwarf2_frame_reg_rule how;
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};
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/* Set the architecture-specific register state initialization
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   function for GDBARCH to INIT_REG.  */
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extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch,
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                                       void (*init_reg) (struct gdbarch *, int,
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                                             struct dwarf2_frame_state_reg *,
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                                             struct frame_info *));
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/* Set the architecture-specific signal trampoline recognition
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   function for GDBARCH to SIGNAL_FRAME_P.  */
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extern void
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  dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch,
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                                   int (*signal_frame_p) (struct gdbarch *,
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                                                          struct frame_info *));
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/* Set the architecture-specific adjustment of .eh_frame and .debug_frame
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   register numbers.  */
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extern void
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  dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch,
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                                  int (*adjust_regnum) (struct gdbarch *,
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                                                        int, int));
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/* Append the DWARF-2 frame unwinders to GDBARCH's list.  */
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void dwarf2_append_unwinders (struct gdbarch *gdbarch);
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/* Return the frame base methods for the function that contains PC, or
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   NULL if it can't be handled by the DWARF CFI frame unwinder.  */
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extern const struct frame_base *
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  dwarf2_frame_base_sniffer (struct frame_info *this_frame);
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/* Register the DWARF CFI for OBJFILE.  */
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void dwarf2_frame_build_info (struct objfile *objfile);
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/* Compute the DWARF CFA for a frame.  */
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CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame);
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#endif /* dwarf2-frame.h */

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