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jeremybenn |
/* Traditional frame unwind support, for GDB the GNU Debugger.
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Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
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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 TRAD_FRAME_H
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#define TRAD_FRAME_H
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#include "frame.h" /* For "struct frame_id". */
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struct frame_info;
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struct trad_frame_cache;
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/* A simple, or traditional frame cache.
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The entire cache is populated in a single pass and then generic
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routines are used to extract the various cache values. */
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struct trad_frame_cache *trad_frame_cache_zalloc (struct frame_info *next_frame);
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/* This frame's ID. */
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void trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
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struct frame_id this_id);
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void trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
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struct frame_id *this_id);
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void trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
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CORE_ADDR this_base);
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CORE_ADDR trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache);
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void trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
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int regnum, int realreg);
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void trad_frame_set_reg_unknown (struct trad_frame_cache *this_trad_cache,
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int regnum, CORE_ADDR addr);
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void trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
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int regnum, CORE_ADDR addr);
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void trad_frame_set_reg_value (struct trad_frame_cache *this_cache,
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int regnum, LONGEST val);
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void trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
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struct frame_info *next_frame,
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realregp, gdb_byte *bufferp);
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/* A traditional saved regs table, indexed by REGNUM, encoding where
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the value of REGNUM for the previous frame can be found in this
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frame.
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The table is initialized with an identity encoding (ADDR == -1,
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REALREG == REGNUM) indicating that the value of REGNUM in the
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previous frame can be found in register REGNUM (== REALREG) in this
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frame.
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The initial encoding can then be changed:
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Modify ADDR (REALREG >= 0, ADDR != -1) to indicate that the value
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of register REGNUM in the previous frame can be found in memory at
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ADDR in this frame (addr_p, !realreg_p, !value_p).
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Modify REALREG (REALREG >= 0, ADDR == -1) to indicate that the
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value of register REGNUM in the previous frame is found in register
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REALREG in this frame (!addr_p, realreg_p, !value_p).
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Call trad_frame_set_value (REALREG == -1) to indicate that the
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value of register REGNUM in the previous frame is found in ADDR
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(!addr_p, !realreg_p, value_p).
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Call trad_frame_set_unknown (REALREG == -2) to indicate that the
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register's value is not known. */
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struct trad_frame_saved_reg
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{
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LONGEST addr; /* A CORE_ADDR fits in a longest. */
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int realreg;
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};
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/* Encode REGNUM value in the trad-frame. */
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void trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
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int regnum, LONGEST val);
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/* Mark REGNUM as unknown. */
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void trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
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int regnum);
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/* Convenience functions, return non-zero if the register has been
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encoded as specified. */
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int trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[],
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int regnum);
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int trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[],
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int regnum);
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int trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
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int regnum);
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/* Return a freshly allocated (and initialized) trad_frame array. */
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struct trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *next_frame);
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/* Given the trad_frame info, return the location of the specified
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register. */
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void trad_frame_get_prev_register (struct frame_info *next_frame,
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struct trad_frame_saved_reg this_saved_regs[],
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realregp, gdb_byte *bufferp);
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#endif
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