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
30static CORE_ADDR
31default_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
37static CORE_ADDR
38default_frame_locals_address (struct frame_info *next_frame, void **this_cache)
39{
40  return default_frame_base_address (next_frame, this_cache);
41}
42
43static CORE_ADDR
44default_frame_args_address (struct frame_info *next_frame, void **this_cache)
45{
46  return default_frame_base_address (next_frame, this_cache);
47}
48
49const 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
56static struct gdbarch_data *frame_base_data;
57
58struct frame_base_table_entry
59{
60  frame_base_sniffer_ftype *sniffer;
61  struct frame_base_table_entry *next;
62};
63
64struct 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
71static void *
72frame_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
81void
82frame_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
91void
92frame_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
99const struct frame_base *
100frame_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
116extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
117
118void
119_initialize_frame_base (void)
120{
121  frame_base_data = gdbarch_data_register_pre_init (frame_base_init);
122}
123