| 1 | /* Definitions for frame unwinder, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 2003, 2004 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "frame-unwind.h" |
| 25 | #include "gdb_assert.h" |
| 26 | #include "dummy-frame.h" |
| 27 | #include "gdb_obstack.h" |
| 28 | |
| 29 | static struct gdbarch_data *frame_unwind_data; |
| 30 | |
| 31 | struct frame_unwind_table_entry |
| 32 | { |
| 33 | frame_unwind_sniffer_ftype *sniffer; |
| 34 | const struct frame_unwind *unwinder; |
| 35 | struct frame_unwind_table_entry *next; |
| 36 | }; |
| 37 | |
| 38 | struct frame_unwind_table |
| 39 | { |
| 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; |
| 43 | }; |
| 44 | |
| 45 | static void * |
| 46 | frame_unwind_init (struct obstack *obstack) |
| 47 | { |
| 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->unwinder = dummy_frame_unwind; |
| 54 | /* The insertion point for OSABI sniffers. */ |
| 55 | table->osabi_head = &table->list->next; |
| 56 | return table; |
| 57 | } |
| 58 | |
| 59 | void |
| 60 | frame_unwind_append_sniffer (struct gdbarch *gdbarch, |
| 61 | frame_unwind_sniffer_ftype *sniffer) |
| 62 | { |
| 63 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
| 64 | struct frame_unwind_table_entry **ip; |
| 65 | |
| 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; |
| 70 | } |
| 71 | |
| 72 | void |
| 73 | frame_unwind_prepend_unwinder (struct gdbarch *gdbarch, |
| 74 | const struct frame_unwind *unwinder) |
| 75 | { |
| 76 | struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
| 77 | struct frame_unwind_table_entry *entry; |
| 78 | |
| 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; |
| 84 | } |
| 85 | |
| 86 | const struct frame_unwind * |
| 87 | frame_unwind_find_by_frame (struct frame_info *next_frame, void **this_cache) |
| 88 | { |
| 89 | int i; |
| 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) |
| 94 | { |
| 95 | if (entry->sniffer != NULL) |
| 96 | { |
| 97 | const struct frame_unwind *desc = NULL; |
| 98 | desc = entry->sniffer (next_frame); |
| 99 | if (desc != NULL) |
| 100 | return desc; |
| 101 | } |
| 102 | if (entry->unwinder != NULL) |
| 103 | { |
| 104 | if (entry->unwinder->sniffer (entry->unwinder, next_frame, |
| 105 | this_cache)) |
| 106 | return entry->unwinder; |
| 107 | } |
| 108 | } |
| 109 | internal_error (__FILE__, __LINE__, "frame_unwind_find_by_frame failed"); |
| 110 | } |
| 111 | |
| 112 | extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */ |
| 113 | |
| 114 | void |
| 115 | _initialize_frame_unwind (void) |
| 116 | { |
| 117 | frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init); |
| 118 | } |