| 1 | /* Definitions for frame address handler, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 2003 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-base.h" |
| 24 | #include "frame.h" |
| 25 | |
| 26 | /* A default frame base implementations. If it wasn't for the old |
| 27 | FRAME_LOCALS_ADDRESS and FRAME_ARGS_ADDRESS, these could be |
| 28 | combined into a single function. All architectures really need to |
| 29 | override this. */ |
| 30 | |
| 31 | static CORE_ADDR |
| 32 | default_frame_base_address (struct frame_info *next_frame, void **this_cache) |
| 33 | { |
| 34 | struct frame_info *this_frame = get_prev_frame (next_frame); |
| 35 | return get_frame_base (this_frame); /* sigh! */ |
| 36 | } |
| 37 | |
| 38 | static CORE_ADDR |
| 39 | default_frame_locals_address (struct frame_info *next_frame, void **this_cache) |
| 40 | { |
| 41 | struct frame_info *this_frame = get_prev_frame (next_frame); |
| 42 | return FRAME_LOCALS_ADDRESS (this_frame); |
| 43 | } |
| 44 | |
| 45 | static CORE_ADDR |
| 46 | default_frame_args_address (struct frame_info *next_frame, void **this_cache) |
| 47 | { |
| 48 | struct frame_info *this_frame = get_prev_frame (next_frame); |
| 49 | /* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except |
| 50 | that if it is unsure about the answer, it returns 0 instead of |
| 51 | guessing (this happens on the VAX and i960, for example). |
| 52 | |
| 53 | On most machines, we never have to guess about the args address, |
| 54 | so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */ |
| 55 | #ifdef FRAME_ARGS_ADDRESS_CORRECT |
| 56 | return FRAME_ARGS_ADDRESS_CORRECT (this_frame); |
| 57 | #else |
| 58 | return FRAME_ARGS_ADDRESS (this_frame); |
| 59 | #endif |
| 60 | } |
| 61 | |
| 62 | const struct frame_base default_frame_base = { |
| 63 | NULL, /* No parent. */ |
| 64 | default_frame_base_address, |
| 65 | default_frame_locals_address, |
| 66 | default_frame_args_address |
| 67 | }; |
| 68 | |
| 69 | static struct gdbarch_data *frame_base_data; |
| 70 | |
| 71 | struct frame_base_table |
| 72 | { |
| 73 | frame_base_p_ftype **p; |
| 74 | const struct frame_base *default_base; |
| 75 | int nr; |
| 76 | }; |
| 77 | |
| 78 | static void * |
| 79 | frame_base_init (struct gdbarch *gdbarch) |
| 80 | { |
| 81 | struct frame_base_table *table = XCALLOC (1, struct frame_base_table); |
| 82 | table->default_base = &default_frame_base; |
| 83 | return table; |
| 84 | } |
| 85 | |
| 86 | static void |
| 87 | frame_base_free (struct gdbarch *gdbarch, void *data) |
| 88 | { |
| 89 | struct frame_base_table *table = |
| 90 | gdbarch_data (gdbarch, frame_base_data); |
| 91 | xfree (table->p); |
| 92 | xfree (table); |
| 93 | } |
| 94 | |
| 95 | static struct frame_base_table * |
| 96 | frame_base_table (struct gdbarch *gdbarch) |
| 97 | { |
| 98 | struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data); |
| 99 | if (table == NULL) |
| 100 | { |
| 101 | /* ULGH, called during architecture initialization. Patch |
| 102 | things up. */ |
| 103 | table = frame_base_init (gdbarch); |
| 104 | set_gdbarch_data (gdbarch, frame_base_data, table); |
| 105 | } |
| 106 | return table; |
| 107 | } |
| 108 | |
| 109 | /* Append a predicate to the end of the table. */ |
| 110 | static void |
| 111 | append_predicate (struct frame_base_table *table, frame_base_p_ftype *p) |
| 112 | { |
| 113 | table->p = xrealloc (table->p, ((table->nr + 1) |
| 114 | * sizeof (frame_base_p_ftype *))); |
| 115 | table->p[table->nr] = p; |
| 116 | table->nr++; |
| 117 | } |
| 118 | |
| 119 | void |
| 120 | frame_base_append_predicate (struct gdbarch *gdbarch, |
| 121 | frame_base_p_ftype *p) |
| 122 | { |
| 123 | struct frame_base_table *table = frame_base_table (gdbarch); |
| 124 | append_predicate (table, p); |
| 125 | } |
| 126 | |
| 127 | void |
| 128 | frame_base_set_default (struct gdbarch *gdbarch, |
| 129 | const struct frame_base *default_base) |
| 130 | { |
| 131 | struct frame_base_table *table = frame_base_table (gdbarch); |
| 132 | table->default_base = default_base; |
| 133 | } |
| 134 | |
| 135 | const struct frame_base * |
| 136 | frame_base_find_by_pc (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 137 | { |
| 138 | int i; |
| 139 | struct frame_base_table *table = frame_base_table (gdbarch); |
| 140 | for (i = 0; i < table->nr; i++) |
| 141 | { |
| 142 | const struct frame_base *desc = table->p[i] (pc); |
| 143 | if (desc != NULL) |
| 144 | return desc; |
| 145 | } |
| 146 | return table->default_base; |
| 147 | } |
| 148 | |
| 149 | void |
| 150 | _initialize_frame_base (void) |
| 151 | { |
| 152 | frame_base_data = register_gdbarch_data (frame_base_init, |
| 153 | frame_base_free); |
| 154 | } |