gdb/frame-base.c

   1 /* Definitions for frame address handler, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003, 2004, 2007 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 #include "defs.h"
  21 #include "frame-base.h"
  22 #include "frame.h"
  23 #include "gdb_obstack.h"
  24
  25 /* A default frame base implementations.  If it wasn't for the old
  26    DEPRECATED_FRAME_LOCALS_ADDRESS and DEPRECATED_FRAME_ARGS_ADDRESS,
  27    these could be combined into a single function.  All architectures
  28    really need to override this.  */
  29
  30 static CORE_ADDR
  31 default_frame_base_address (struct frame_info *next_frame, void **this_cache)
  32 {
  33   struct frame_info *this_frame = get_prev_frame (next_frame);
  34   return get_frame_base (this_frame); /* sigh! */
  35 }
  36
  37 static CORE_ADDR
  38 default_frame_locals_address (struct frame_info *next_frame, void **this_cache)
  39 {
  40   return default_frame_base_address (next_frame, this_cache);
  41 }
  42
  43 static CORE_ADDR
  44 default_frame_args_address (struct frame_info *next_frame, void **this_cache)
  45 {
  46   return default_frame_base_address (next_frame, this_cache);
  47 }
  48
  49 const struct frame_base default_frame_base = {
  50   NULL, /* No parent.  */
  51   default_frame_base_address,
  52   default_frame_locals_address,
  53   default_frame_args_address
  54 };
  55
  56 static struct gdbarch_data *frame_base_data;
  57
  58 struct frame_base_table_entry
  59 {
  60   frame_base_sniffer_ftype *sniffer;
  61   struct frame_base_table_entry *next;
  62 };
  63
  64 struct frame_base_table
  65 {
  66   struct frame_base_table_entry *head;
  67   struct frame_base_table_entry **tail;
  68   const struct frame_base *default_base;
  69 };
  70
  71 static void *
  72 frame_base_init (struct obstack *obstack)
  73 {
  74   struct frame_base_table *table
  75     = OBSTACK_ZALLOC (obstack, struct frame_base_table);
  76   table->tail = &table->head;
  77   table->default_base = &default_frame_base;
  78   return table;
  79 }
  80
  81 void
  82 frame_base_append_sniffer (struct gdbarch *gdbarch,
  83                            frame_base_sniffer_ftype *sniffer)
  84 {
  85   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
  86   (*table->tail) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_base_table_entry);
  87   (*table->tail)->sniffer = sniffer;
  88   table->tail = &(*table->tail)->next;
  89 }
  90
  91 void
  92 frame_base_set_default (struct gdbarch *gdbarch,
  93                         const struct frame_base *default_base)
  94 {
  95   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
  96   table->default_base = default_base;
  97 }
  98
  99 const struct frame_base *
 100 frame_base_find_by_frame (struct frame_info *next_frame)
 101 {
 102   struct gdbarch *gdbarch = get_frame_arch (next_frame);
 103   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
 104   struct frame_base_table_entry *entry;
 105
 106   for (entry = table->head; entry != NULL; entry = entry->next)
 107     {
 108       const struct frame_base *desc = NULL;
 109       desc = entry->sniffer (next_frame);
 110       if (desc != NULL)
 111         return desc;
 112     }
 113   return table->default_base;
 114 }
 115
 116 extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
 117
 118 void
 119 _initialize_frame_base (void)
 120 {
 121   frame_base_data = gdbarch_data_register_pre_init (frame_base_init);
 122 }