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_sniffer_ftype **sniffer;
  74   const struct frame_base *default_base;
  75   int nr;
  76 };
  77
  78 static void *
  79 frame_base_init (struct gdbarch *gdbarch)
  80 {
  81   struct frame_base_table *table = XCALLOC (1, struct frame_base_table);
  82   table->default_base = &default_frame_base;
  83   return table;
  84 }
  85
  86 static struct frame_base_table *
  87 frame_base_table (struct gdbarch *gdbarch)
  88 {
  89   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
  90   if (table == NULL)
  91     {
  92       /* ULGH, called during architecture initialization.  Patch
  93          things up.  */
  94       table = frame_base_init (gdbarch);
  95       set_gdbarch_data (gdbarch, frame_base_data, table);
  96     }
  97   return table;
  98 }
  99
 100 /* Append a predicate to the end of the table.  */
 101 static void
 102 append_predicate (struct frame_base_table *table,
 103                   frame_base_sniffer_ftype *sniffer)
 104 {
 105   table->sniffer = xrealloc (table->sniffer,
 106                              ((table->nr + 1)
 107                               * sizeof (frame_base_sniffer_ftype *)));
 108   table->sniffer[table->nr] = sniffer;
 109   table->nr++;
 110 }
 111
 112 void
 113 frame_base_append_sniffer (struct gdbarch *gdbarch,
 114                            frame_base_sniffer_ftype *sniffer)
 115 {
 116   struct frame_base_table *table = frame_base_table (gdbarch);
 117   append_predicate (table, sniffer);
 118 }
 119
 120 void
 121 frame_base_set_default (struct gdbarch *gdbarch,
 122                         const struct frame_base *default_base)
 123 {
 124   struct frame_base_table *table = frame_base_table (gdbarch);
 125   table->default_base = default_base;
 126 }
 127
 128 const struct frame_base *
 129 frame_base_find_by_frame (struct frame_info *next_frame)
 130 {
 131   struct gdbarch *gdbarch = get_frame_arch (next_frame);
 132   struct frame_base_table *table = frame_base_table (gdbarch);
 133   int i;
 134   for (i = 0; i < table->nr; i++)
 135     {
 136       const struct frame_base *desc = NULL;
 137       desc = table->sniffer[i] (next_frame);
 138       if (desc != NULL)
 139         return desc;
 140     }
 141   return table->default_base;
 142 }
 143
 144 extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
 145
 146 void
 147 _initialize_frame_base (void)
 148 {
 149   frame_base_data = register_gdbarch_data (frame_base_init);
 150 }