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 const struct frame_unwind *unwinder;
35 struct frame_unwind_table_entry *next;
38 struct frame_unwind_table
40 struct frame_unwind_table_entry *list;
41 /* The head of the OSABI part of the search list. */
42 struct frame_unwind_table_entry **osabi_head;
46 frame_unwind_init (struct obstack *obstack)
48 struct frame_unwind_table *table
49 = OBSTACK_ZALLOC (obstack, struct frame_unwind_table);
50 /* Start the table out with a few default sniffers. OSABI code
51 can't override this. */
52 table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
53 table->list->sniffer = dummy_frame_sniffer;
54 /* The insertion point for OSABI sniffers. */
55 table->osabi_head = &table->list->next;
60 frame_unwind_append_sniffer (struct gdbarch *gdbarch,
61 frame_unwind_sniffer_ftype *sniffer)
63 struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
64 struct frame_unwind_table_entry **ip;
66 /* Find the end of the list and insert the new entry there. */
67 for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next);
68 (*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
69 (*ip)->sniffer = sniffer;
73 frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
74 const struct frame_unwind *unwinder)
76 struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
77 struct frame_unwind_table_entry *entry;
79 /* Insert the new entry at the start of the list. */
80 entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
81 entry->unwinder = unwinder;
82 entry->next = (*table->osabi_head);
83 (*table->osabi_head) = entry;
86 const struct frame_unwind *
87 frame_unwind_find_by_frame (struct frame_info *next_frame, void **this_cache)
90 struct gdbarch *gdbarch = get_frame_arch (next_frame);
91 struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
92 struct frame_unwind_table_entry *entry;
93 for (entry = table->list; entry != NULL; entry = entry->next)
95 if (entry->sniffer != NULL)
97 const struct frame_unwind *desc = NULL;
98 desc = entry->sniffer (next_frame);
102 if (entry->unwinder != NULL)
104 if (entry->unwinder->sniffer (entry->unwinder, next_frame,
106 return entry->unwinder;
109 internal_error (__FILE__, __LINE__, "frame_unwind_find_by_frame failed");
112 extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
115 _initialize_frame_unwind (void)
117 frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);