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trad-frame.h revision 1.1 
      1 /* Traditional frame unwind support, for GDB the GNU Debugger.
      2 
      3    Copyright (C) 2003-2014 Free Software Foundation, Inc.
      4 
      5    This file is part of GDB.
      6 
      7    This program is free software; you can redistribute it and/or modify
      8    it under the terms of the GNU General Public License as published by
      9    the Free Software Foundation; either version 3 of the License, or
     10    (at your option) any later version.
     11 
     12    This program is distributed in the hope that it will be useful,
     13    but WITHOUT ANY WARRANTY; without even the implied warranty of
     14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15    GNU General Public License for more details.
     16 
     17    You should have received a copy of the GNU General Public License
     18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     19 
     20 #ifndef TRAD_FRAME_H
     21 #define TRAD_FRAME_H
     22 
     23 #include "frame.h"		/* For "struct frame_id".  */
     24 
     25 struct frame_info;
     26 struct trad_frame_cache;
     27 
     28 /* A simple, or traditional frame cache.
     29 
     30    The entire cache is populated in a single pass and then generic
     31    routines are used to extract the various cache values.  */
     32 
     33 struct trad_frame_cache *trad_frame_cache_zalloc (struct frame_info *);
     34 
     35 /* This frame's ID.  */
     36 void trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
     37 			struct frame_id this_id);
     38 void trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
     39 			struct frame_id *this_id);
     40 void trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
     41 			       CORE_ADDR this_base);
     42 CORE_ADDR trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache);
     43 
     44 void trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
     45 				 int regnum, int realreg);
     46 void trad_frame_set_reg_unknown (struct trad_frame_cache *this_trad_cache,
     47 				 int regnum, CORE_ADDR addr);
     48 void trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
     49 			      int regnum, CORE_ADDR addr);
     50 void trad_frame_set_reg_value (struct trad_frame_cache *this_cache,
     51 			       int regnum, LONGEST val);
     52 
     53 struct value *trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
     54 				       struct frame_info *this_frame,
     55 				       int regnum);
     56 
     57 /* A traditional saved regs table, indexed by REGNUM, encoding where
     58    the value of REGNUM for the previous frame can be found in this
     59    frame.
     60 
     61    The table is initialized with an identity encoding (ADDR == -1,
     62    REALREG == REGNUM) indicating that the value of REGNUM in the
     63    previous frame can be found in register REGNUM (== REALREG) in this
     64    frame.
     65 
     66    The initial encoding can then be changed:
     67 
     68    Modify ADDR (REALREG >= 0, ADDR != -1) to indicate that the value
     69    of register REGNUM in the previous frame can be found in memory at
     70    ADDR in this frame (addr_p, !realreg_p, !value_p).
     71 
     72    Modify REALREG (REALREG >= 0, ADDR == -1) to indicate that the
     73    value of register REGNUM in the previous frame is found in register
     74    REALREG in this frame (!addr_p, realreg_p, !value_p).
     75 
     76    Call trad_frame_set_value (REALREG == -1) to indicate that the
     77    value of register REGNUM in the previous frame is found in ADDR
     78    (!addr_p, !realreg_p, value_p).
     79 
     80    Call trad_frame_set_unknown (REALREG == -2) to indicate that the
     81    register's value is not known.  */
     82 
     83 struct trad_frame_saved_reg
     84 {
     85   LONGEST addr; /* A CORE_ADDR fits in a longest.  */
     86   int realreg;
     87 };
     88 
     89 /* Encode REGNUM value in the trad-frame.  */
     90 void trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
     91 			   int regnum, LONGEST val);
     92 
     93 /* Mark REGNUM as unknown.  */
     94 void trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
     95 			     int regnum);
     96 
     97 /* Convenience functions, return non-zero if the register has been
     98    encoded as specified.  */
     99 int trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[],
    100 			int regnum);
    101 int trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[],
    102 		       int regnum);
    103 int trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
    104 			  int regnum);
    105 
    106 
    107 /* Return a freshly allocated (and initialized) trad_frame array.  */
    108 struct trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *);
    109 
    110 /* Given the trad_frame info, return the location of the specified
    111    register.  */
    112 struct value *trad_frame_get_prev_register (struct frame_info *this_frame,
    113 					    struct trad_frame_saved_reg this_saved_regs[],
    114 					    int regnum);
    115 
    116 #endif
    117