1 /* Definitions for frame unwinder, for GDB, the GNU debugger.
3 Copyright 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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. */
24 #include "frame-unwind.h"
25 #include "gdb_assert.h"
26 #include "dummy-frame.h"
27 #include "gdb_obstack.h"
29 static struct gdbarch_data *frame_unwind_data;
31 struct frame_unwind_table_entry
33 frame_unwind_sniffer_ftype *sniffer;
34 struct frame_unwind_table_entry *next;
37 struct frame_unwind_table
39 struct frame_unwind_table_entry *head;
40 struct frame_unwind_table_entry **tail;
44 frame_unwind_init (struct obstack *obstack)
46 struct frame_unwind_table *table
47 = OBSTACK_ZALLOC (obstack, struct frame_unwind_table);
48 table->head = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
49 table->head->sniffer = dummy_frame_sniffer;
50 table->tail = &table->head->next;
55 frame_unwind_append_sniffer (struct gdbarch *gdbarch,
56 frame_unwind_sniffer_ftype *sniffer)
58 struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
59 (*table->tail) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
60 (*table->tail)->sniffer = sniffer;
61 table->tail = &((*table->tail)->next);
64 const struct frame_unwind *
65 frame_unwind_find_by_frame (struct frame_info *next_frame)
68 struct gdbarch *gdbarch = get_frame_arch (next_frame);
69 struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
70 struct frame_unwind_table_entry *entry;
71 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES && legacy_frame_p (gdbarch))
72 /* Seriously old code. Don't even try to use this new mechanism.
73 (Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not
74 the dummy frame mechanism. All architectures should be using
75 generic dummy frames). */
76 return legacy_saved_regs_unwind;
77 for (entry = table->head; entry != NULL; entry = entry->next)
79 const struct frame_unwind *desc;
80 desc = entry->sniffer (next_frame);
84 return legacy_saved_regs_unwind;
87 extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
90 _initialize_frame_unwind (void)
92 frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);