| 1 | /* Definitions for frame unwinder, 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.h" |
| 24 | #include "frame-unwind.h" |
| 25 | #include "gdb_assert.h" |
| 26 | #include "dummy-frame.h" |
| 27 | |
| 28 | static struct gdbarch_data *frame_unwind_data; |
| 29 | |
| 30 | struct frame_unwind_table |
| 31 | { |
| 32 | frame_unwind_p_ftype **p; |
| 33 | int middle; |
| 34 | int nr; |
| 35 | }; |
| 36 | |
| 37 | /* Append a predicate to the end of the table. */ |
| 38 | static void |
| 39 | append_predicate (struct frame_unwind_table *table, frame_unwind_p_ftype *p) |
| 40 | { |
| 41 | table->p = xrealloc (table->p, ((table->nr + 1) |
| 42 | * sizeof (frame_unwind_p_ftype *))); |
| 43 | table->p[table->nr] = p; |
| 44 | table->nr++; |
| 45 | } |
| 46 | |
| 47 | static void * |
| 48 | frame_unwind_init (struct gdbarch *gdbarch) |
| 49 | { |
| 50 | struct frame_unwind_table *table = XCALLOC (1, struct frame_unwind_table); |
| 51 | append_predicate (table, dummy_frame_p); |
| 52 | return table; |
| 53 | } |
| 54 | |
| 55 | static void |
| 56 | frame_unwind_free (struct gdbarch *gdbarch, void *data) |
| 57 | { |
| 58 | struct frame_unwind_table *table = |
| 59 | gdbarch_data (gdbarch, frame_unwind_data); |
| 60 | xfree (table->p); |
| 61 | xfree (table); |
| 62 | } |
| 63 | |
| 64 | void |
| 65 | frame_unwind_append_predicate (struct gdbarch *gdbarch, |
| 66 | frame_unwind_p_ftype *p) |
| 67 | { |
| 68 | struct frame_unwind_table *table = |
| 69 | gdbarch_data (gdbarch, frame_unwind_data); |
| 70 | if (table == NULL) |
| 71 | { |
| 72 | /* ULGH, called during architecture initialization. Patch |
| 73 | things up. */ |
| 74 | table = frame_unwind_init (gdbarch); |
| 75 | set_gdbarch_data (gdbarch, frame_unwind_data, table); |
| 76 | } |
| 77 | append_predicate (table, p); |
| 78 | } |
| 79 | |
| 80 | const struct frame_unwind * |
| 81 | frame_unwind_find_by_pc (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 82 | { |
| 83 | int i; |
| 84 | struct frame_unwind_table *table = |
| 85 | gdbarch_data (gdbarch, frame_unwind_data); |
| 86 | if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES) |
| 87 | /* Seriously old code. Don't even try to use this new mechanism. |
| 88 | (Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not |
| 89 | the dummy frame mechanism. All architectures should be using |
| 90 | generic dummy frames). */ |
| 91 | return legacy_saved_regs_unwind; |
| 92 | for (i = 0; i < table->nr; i++) |
| 93 | { |
| 94 | const struct frame_unwind *desc = table->p[i] (pc); |
| 95 | if (desc != NULL) |
| 96 | return desc; |
| 97 | } |
| 98 | return legacy_saved_regs_unwind; |
| 99 | } |
| 100 | |
| 101 | void |
| 102 | _initialize_frame_unwind (void) |
| 103 | { |
| 104 | frame_unwind_data = register_gdbarch_data (frame_unwind_init, |
| 105 | frame_unwind_free); |
| 106 | } |