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    DEPRECATED_FRAME_LOCALS_ADDRESS and DEPRECATED_FRAME_ARGS_ADDRESS,
  28    these could be combined into a single function.  All architectures
  29    really need to 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   if (DEPRECATED_FRAME_LOCALS_ADDRESS_P ())
  42     {
  43       /* This is bad.  The computation of per-frame locals address
  44          should use a per-frame frame-base.  */
  45       struct frame_info *this_frame = get_prev_frame (next_frame);
  46       return DEPRECATED_FRAME_LOCALS_ADDRESS (this_frame);
  47     }
  48   return default_frame_base_address (next_frame, this_cache);
  49 }
  50
  51 static CORE_ADDR
  52 default_frame_args_address (struct frame_info *next_frame, void **this_cache)
  53 {
  54   if (DEPRECATED_FRAME_ARGS_ADDRESS_P ())
  55     {
  56       struct frame_info *this_frame = get_prev_frame (next_frame);
  57       return DEPRECATED_FRAME_ARGS_ADDRESS (this_frame);
  58     }
  59   return default_frame_base_address (next_frame, this_cache);
  60 }
  61
  62 const struct frame_base default_frame_base = {
  63   NULL, /* No parent.  */
  64   default_frame_base_address,
  65   default_frame_locals_address,
  66   default_frame_args_address
  67 };
  68
  69 static struct gdbarch_data *frame_base_data;
  70
  71 struct frame_base_table
  72 {
  73   frame_base_p_ftype **p;
  74   frame_base_sniffer_ftype **sniffer;
  75   const struct frame_base *default_base;
  76   int nr;
  77 };
  78
  79 static void *
  80 frame_base_init (struct gdbarch *gdbarch)
  81 {
  82   struct frame_base_table *table = XCALLOC (1, struct frame_base_table);
  83   table->default_base = &default_frame_base;
  84   return table;
  85 }
  86
  87 static void
  88 frame_base_free (struct gdbarch *gdbarch, void *data)
  89 {
  90   struct frame_base_table *table =
  91     gdbarch_data (gdbarch, frame_base_data);
  92   xfree (table->p);
  93   xfree (table->sniffer);
  94   xfree (table);
  95 }
  96
  97 static struct frame_base_table *
  98 frame_base_table (struct gdbarch *gdbarch)
  99 {
 100   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
 101   if (table == NULL)
 102     {
 103       /* ULGH, called during architecture initialization.  Patch
 104          things up.  */
 105       table = frame_base_init (gdbarch);
 106       set_gdbarch_data (gdbarch, frame_base_data, table);
 107     }
 108   return table;
 109 }
 110
 111 /* Append a predicate to the end of the table.  */
 112 static void
 113 append_predicate (struct frame_base_table *table, frame_base_p_ftype *p,
 114                   frame_base_sniffer_ftype *sniffer)
 115 {
 116   table->p = xrealloc (table->p, ((table->nr + 1)
 117                                   * sizeof (frame_base_p_ftype *)));
 118   table->sniffer = xrealloc (table->sniffer,
 119                              ((table->nr + 1)
 120                               * sizeof (frame_base_sniffer_ftype *)));
 121   table->p[table->nr] = p;
 122   table->sniffer[table->nr] = sniffer;
 123   table->nr++;
 124 }
 125
 126 void
 127 frame_base_append_predicate (struct gdbarch *gdbarch,
 128                              frame_base_p_ftype *p)
 129 {
 130   struct frame_base_table *table = frame_base_table (gdbarch);
 131   append_predicate (table, p, NULL);
 132 }
 133
 134 void
 135 frame_base_append_sniffer (struct gdbarch *gdbarch,
 136                            frame_base_sniffer_ftype *sniffer)
 137 {
 138   struct frame_base_table *table = frame_base_table (gdbarch);
 139   append_predicate (table, NULL, sniffer);
 140 }
 141
 142 void
 143 frame_base_set_default (struct gdbarch *gdbarch,
 144                         const struct frame_base *default_base)
 145 {
 146   struct frame_base_table *table = frame_base_table (gdbarch);
 147   table->default_base = default_base;
 148 }
 149
 150 const struct frame_base *
 151 frame_base_find_by_frame (struct frame_info *next_frame)
 152 {
 153   struct gdbarch *gdbarch = get_frame_arch (next_frame);
 154   struct frame_base_table *table = frame_base_table (gdbarch);
 155   int i;
 156   for (i = 0; i < table->nr; i++)
 157     {
 158       const struct frame_base *desc = NULL;
 159       if (table->p[i] != NULL)
 160         desc = table->p[i] (frame_pc_unwind (next_frame));
 161       else if (table->sniffer[i] != NULL)
 162         desc = table->sniffer[i] (next_frame);
 163       if (desc != NULL)
 164         return desc;
 165     }
 166   return table->default_base;
 167 }
 168
 169 extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
 170
 171 void
 172 _initialize_frame_base (void)
 173 {
 174   frame_base_data = register_gdbarch_data (frame_base_init,
 175                                            frame_base_free);
 176 }