| 1 | /* Definitions for frame address handler, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2003-2018 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 | |
| 30 | static CORE_ADDR |
| 31 | default_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 32 | { |
| 33 | return get_frame_base (this_frame); /* sigh! */ |
| 34 | } |
| 35 | |
| 36 | static CORE_ADDR |
| 37 | default_frame_locals_address (struct frame_info *this_frame, void **this_cache) |
| 38 | { |
| 39 | return default_frame_base_address (this_frame, this_cache); |
| 40 | } |
| 41 | |
| 42 | static CORE_ADDR |
| 43 | default_frame_args_address (struct frame_info *this_frame, void **this_cache) |
| 44 | { |
| 45 | return default_frame_base_address (this_frame, this_cache); |
| 46 | } |
| 47 | |
| 48 | const struct frame_base default_frame_base = { |
| 49 | NULL, /* No parent. */ |
| 50 | default_frame_base_address, |
| 51 | default_frame_locals_address, |
| 52 | default_frame_args_address |
| 53 | }; |
| 54 | |
| 55 | static struct gdbarch_data *frame_base_data; |
| 56 | |
| 57 | struct frame_base_table_entry |
| 58 | { |
| 59 | frame_base_sniffer_ftype *sniffer; |
| 60 | struct frame_base_table_entry *next; |
| 61 | }; |
| 62 | |
| 63 | struct frame_base_table |
| 64 | { |
| 65 | struct frame_base_table_entry *head; |
| 66 | struct frame_base_table_entry **tail; |
| 67 | const struct frame_base *default_base; |
| 68 | }; |
| 69 | |
| 70 | static void * |
| 71 | frame_base_init (struct obstack *obstack) |
| 72 | { |
| 73 | struct frame_base_table *table |
| 74 | = OBSTACK_ZALLOC (obstack, struct frame_base_table); |
| 75 | |
| 76 | table->tail = &table->head; |
| 77 | table->default_base = &default_frame_base; |
| 78 | return table; |
| 79 | } |
| 80 | |
| 81 | void |
| 82 | frame_base_append_sniffer (struct gdbarch *gdbarch, |
| 83 | frame_base_sniffer_ftype *sniffer) |
| 84 | { |
| 85 | struct frame_base_table *table |
| 86 | = (struct frame_base_table *) gdbarch_data (gdbarch, frame_base_data); |
| 87 | |
| 88 | (*table->tail) |
| 89 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_base_table_entry); |
| 90 | (*table->tail)->sniffer = sniffer; |
| 91 | table->tail = &(*table->tail)->next; |
| 92 | } |
| 93 | |
| 94 | void |
| 95 | frame_base_set_default (struct gdbarch *gdbarch, |
| 96 | const struct frame_base *default_base) |
| 97 | { |
| 98 | struct frame_base_table *table |
| 99 | = (struct frame_base_table *) gdbarch_data (gdbarch, frame_base_data); |
| 100 | |
| 101 | table->default_base = default_base; |
| 102 | } |
| 103 | |
| 104 | const struct frame_base * |
| 105 | frame_base_find_by_frame (struct frame_info *this_frame) |
| 106 | { |
| 107 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 108 | struct frame_base_table *table |
| 109 | = (struct frame_base_table *) gdbarch_data (gdbarch, frame_base_data); |
| 110 | struct frame_base_table_entry *entry; |
| 111 | |
| 112 | for (entry = table->head; entry != NULL; entry = entry->next) |
| 113 | { |
| 114 | const struct frame_base *desc = NULL; |
| 115 | |
| 116 | desc = entry->sniffer (this_frame); |
| 117 | if (desc != NULL) |
| 118 | return desc; |
| 119 | } |
| 120 | return table->default_base; |
| 121 | } |
| 122 | |
| 123 | void |
| 124 | _initialize_frame_base (void) |
| 125 | { |
| 126 | frame_base_data = gdbarch_data_register_pre_init (frame_base_init); |
| 127 | } |