gdb/frame-base.c

   1 /* Definitions for frame address handler, for GDB, the GNU debugger.
   2
   3    Copyright 2003 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 2 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, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "frame-base.h"
  24 #include "frame.h"
  25
  26 /* A default frame base implementations.  If it wasn't for the old
  27    FRAME_LOCALS_ADDRESS and FRAME_ARGS_ADDRESS, these could be
  28    combined into a single function.  All architectures really need to
  29    override this.  */
  30
  31 static CORE_ADDR
  32 default_frame_base_address (struct frame_info *next_frame, void **this_cache)
  33 {
  34   struct frame_info *this_frame = get_prev_frame (next_frame);
  35   return get_frame_base (this_frame); /* sigh! */
  36 }
  37
  38 static CORE_ADDR
  39 default_frame_locals_address (struct frame_info *next_frame, void **this_cache)
  40 {
  41   struct frame_info *this_frame = get_prev_frame (next_frame);
  42   return FRAME_LOCALS_ADDRESS (this_frame);
  43 }
  44
  45 static CORE_ADDR
  46 default_frame_args_address (struct frame_info *next_frame, void **this_cache)
  47 {
  48   struct frame_info *this_frame = get_prev_frame (next_frame);
  49   return FRAME_ARGS_ADDRESS (this_frame);
  50 }
  51
  52 const struct frame_base default_frame_base = {
  53   NULL, /* No parent.  */
  54   default_frame_base_address,
  55   default_frame_locals_address,
  56   default_frame_args_address
  57 };
  58
  59 static struct gdbarch_data *frame_base_data;
  60
  61 struct frame_base_table
  62 {
  63   frame_base_p_ftype **p;
  64   const struct frame_base *default_base;
  65   int nr;
  66 };
  67
  68 static void *
  69 frame_base_init (struct gdbarch *gdbarch)
  70 {
  71   struct frame_base_table *table = XCALLOC (1, struct frame_base_table);
  72   table->default_base = &default_frame_base;
  73   return table;
  74 }
  75
  76 static void
  77 frame_base_free (struct gdbarch *gdbarch, void *data)
  78 {
  79   struct frame_base_table *table =
  80     gdbarch_data (gdbarch, frame_base_data);
  81   xfree (table->p);
  82   xfree (table);
  83 }
  84
  85 static struct frame_base_table *
  86 frame_base_table (struct gdbarch *gdbarch)
  87 {
  88   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
  89   if (table == NULL)
  90     {
  91       /* ULGH, called during architecture initialization.  Patch
  92          things up.  */
  93       table = frame_base_init (gdbarch);
  94       set_gdbarch_data (gdbarch, frame_base_data, table);
  95     }
  96   return table;
  97 }
  98
  99 /* Append a predicate to the end of the table.  */
 100 static void
 101 append_predicate (struct frame_base_table *table, frame_base_p_ftype *p)
 102 {
 103   table->p = xrealloc (table->p, ((table->nr + 1)
 104                                   * sizeof (frame_base_p_ftype *)));
 105   table->p[table->nr] = p;
 106   table->nr++;
 107 }
 108
 109 void
 110 frame_base_append_predicate (struct gdbarch *gdbarch,
 111                              frame_base_p_ftype *p)
 112 {
 113   struct frame_base_table *table = frame_base_table (gdbarch);
 114   append_predicate (table, p);
 115 }
 116
 117 void
 118 frame_base_set_default (struct gdbarch *gdbarch,
 119                         const struct frame_base *default_base)
 120 {
 121   struct frame_base_table *table = frame_base_table (gdbarch);
 122   table->default_base = default_base;
 123 }
 124
 125 const struct frame_base *
 126 frame_base_find_by_pc (struct gdbarch *gdbarch, CORE_ADDR pc)
 127 {
 128   int i;
 129   struct frame_base_table *table = frame_base_table (gdbarch);
 130   for (i = 0; i < table->nr; i++)
 131     {
 132       const struct frame_base *desc = table->p[i] (pc);
 133       if (desc != NULL)
 134         return desc;
 135     }
 136   return table->default_base;
 137 }
 138
 139 extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-protypes */
 140
 141 void
 142 _initialize_frame_base (void)
 143 {
 144   frame_base_data = register_gdbarch_data (frame_base_init,
 145                                            frame_base_free);
 146 }