gdb/frame-base.c

   1 /* Definitions for frame address handler, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "frame-base.h"
  23 #include "frame.h"
  24 #include "gdb_obstack.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 *this_frame, void **this_cache)
  33 {
  34   return get_frame_base (this_frame); /* sigh! */
  35 }
  36
  37 static CORE_ADDR
  38 default_frame_locals_address (struct frame_info *this_frame, void **this_cache)
  39 {
  40   return default_frame_base_address (this_frame, this_cache);
  41 }
  42
  43 static CORE_ADDR
  44 default_frame_args_address (struct frame_info *this_frame, void **this_cache)
  45 {
  46   return default_frame_base_address (this_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
  77   table->tail = &table->head;
  78   table->default_base = &default_frame_base;
  79   return table;
  80 }
  81
  82 void
  83 frame_base_append_sniffer (struct gdbarch *gdbarch,
  84                            frame_base_sniffer_ftype *sniffer)
  85 {
  86   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
  87
  88   (*table->tail) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_base_table_entry);
  89   (*table->tail)->sniffer = sniffer;
  90   table->tail = &(*table->tail)->next;
  91 }
  92
  93 void
  94 frame_base_set_default (struct gdbarch *gdbarch,
  95                         const struct frame_base *default_base)
  96 {
  97   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
  98
  99   table->default_base = default_base;
 100 }
 101
 102 const struct frame_base *
 103 frame_base_find_by_frame (struct frame_info *this_frame)
 104 {
 105   struct gdbarch *gdbarch = get_frame_arch (this_frame);
 106   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
 107   struct frame_base_table_entry *entry;
 108
 109   for (entry = table->head; entry != NULL; entry = entry->next)
 110     {
 111       const struct frame_base *desc = NULL;
 112
 113       desc = entry->sniffer (this_frame);
 114       if (desc != NULL)
 115         return desc;
 116     }
 117   return table->default_base;
 118 }
 119
 120 extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
 121
 122 void
 123 _initialize_frame_base (void)
 124 {
 125   frame_base_data = gdbarch_data_register_pre_init (frame_base_init);
 126 }