gdb/frame-base.c

   1 /* Definitions for frame address handler, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2019 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
  22 /* Local non-gdb includes.  */
  23 #include "frame-base.h"
  24 #include "frame.h"
  25 #include "gdb_obstack.h"
  26
  27 /* A default frame base implementations.  If it wasn't for the old
  28    DEPRECATED_FRAME_LOCALS_ADDRESS and DEPRECATED_FRAME_ARGS_ADDRESS,
  29    these could be combined into a single function.  All architectures
  30    really need to override this.  */
  31
  32 static CORE_ADDR
  33 default_frame_base_address (struct frame_info *this_frame, void **this_cache)
  34 {
  35   return get_frame_base (this_frame); /* sigh! */
  36 }
  37
  38 static CORE_ADDR
  39 default_frame_locals_address (struct frame_info *this_frame, void **this_cache)
  40 {
  41   return default_frame_base_address (this_frame, this_cache);
  42 }
  43
  44 static CORE_ADDR
  45 default_frame_args_address (struct frame_info *this_frame, void **this_cache)
  46 {
  47   return default_frame_base_address (this_frame, this_cache);
  48 }
  49
  50 const struct frame_base default_frame_base = {
  51   NULL, /* No parent.  */
  52   default_frame_base_address,
  53   default_frame_locals_address,
  54   default_frame_args_address
  55 };
  56
  57 static struct gdbarch_data *frame_base_data;
  58
  59 struct frame_base_table_entry
  60 {
  61   frame_base_sniffer_ftype *sniffer;
  62   struct frame_base_table_entry *next;
  63 };
  64
  65 struct frame_base_table
  66 {
  67   struct frame_base_table_entry *head;
  68   struct frame_base_table_entry **tail;
  69   const struct frame_base *default_base;
  70 };
  71
  72 static void *
  73 frame_base_init (struct obstack *obstack)
  74 {
  75   struct frame_base_table *table
  76     = OBSTACK_ZALLOC (obstack, struct frame_base_table);
  77
  78   table->tail = &table->head;
  79   table->default_base = &default_frame_base;
  80   return table;
  81 }
  82
  83 void
  84 frame_base_append_sniffer (struct gdbarch *gdbarch,
  85                            frame_base_sniffer_ftype *sniffer)
  86 {
  87   struct frame_base_table *table
  88     = (struct frame_base_table *) gdbarch_data (gdbarch, frame_base_data);
  89
  90   (*table->tail)
  91     = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_base_table_entry);
  92   (*table->tail)->sniffer = sniffer;
  93   table->tail = &(*table->tail)->next;
  94 }
  95
  96 void
  97 frame_base_set_default (struct gdbarch *gdbarch,
  98                         const struct frame_base *default_base)
  99 {
 100   struct frame_base_table *table
 101     = (struct frame_base_table *) gdbarch_data (gdbarch, frame_base_data);
 102
 103   table->default_base = default_base;
 104 }
 105
 106 const struct frame_base *
 107 frame_base_find_by_frame (struct frame_info *this_frame)
 108 {
 109   struct gdbarch *gdbarch = get_frame_arch (this_frame);
 110   struct frame_base_table *table
 111     = (struct frame_base_table *) gdbarch_data (gdbarch, frame_base_data);
 112   struct frame_base_table_entry *entry;
 113
 114   for (entry = table->head; entry != NULL; entry = entry->next)
 115     {
 116       const struct frame_base *desc = NULL;
 117
 118       desc = entry->sniffer (this_frame);
 119       if (desc != NULL)
 120         return desc;
 121     }
 122   return table->default_base;
 123 }
 124
 125 void
 126 _initialize_frame_base (void)
 127 {
 128   frame_base_data = gdbarch_data_register_pre_init (frame_base_init);
 129 }