| /* Definitions for frame unwinder, for GDB, the GNU debugger. |
| |
| Copyright 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "frame.h" |
| #include "frame-unwind.h" |
| #include "gdb_assert.h" |
| #include "dummy-frame.h" |
| #include "gdb_obstack.h" |
| |
| static struct gdbarch_data *frame_unwind_data; |
| |
| struct frame_unwind_table_entry |
| { |
| frame_unwind_sniffer_ftype *sniffer; |
| const struct frame_unwind *unwinder; |
| struct frame_unwind_table_entry *next; |
| }; |
| |
| struct frame_unwind_table |
| { |
| struct frame_unwind_table_entry *head; |
| struct frame_unwind_table_entry **tail; |
| }; |
| |
| static void * |
| frame_unwind_init (struct obstack *obstack) |
| { |
| struct frame_unwind_table *table |
| = OBSTACK_ZALLOC (obstack, struct frame_unwind_table); |
| table->head = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry); |
| table->head->sniffer = dummy_frame_sniffer; |
| table->tail = &table->head->next; |
| return table; |
| } |
| |
| void |
| frame_unwind_append_sniffer (struct gdbarch *gdbarch, |
| frame_unwind_sniffer_ftype *sniffer) |
| { |
| struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
| (*table->tail) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); |
| (*table->tail)->sniffer = sniffer; |
| table->tail = &((*table->tail)->next); |
| } |
| |
| void |
| frame_unwind_register_unwinder (struct gdbarch *gdbarch, |
| const struct frame_unwind *unwinder) |
| { |
| struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
| (*table->tail) = GDBARCH_OBSTACK_ZALLOC (gdbarch, |
| struct frame_unwind_table_entry); |
| (*table->tail)->unwinder = unwinder; |
| table->tail = &((*table->tail)->next); |
| } |
| |
| const struct frame_unwind * |
| frame_unwind_find_by_frame (struct frame_info *next_frame, void **this_cache) |
| { |
| int i; |
| struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
| struct frame_unwind_table_entry *entry; |
| if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES && legacy_frame_p (gdbarch)) |
| /* Seriously old code. Don't even try to use this new mechanism. |
| (Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not |
| the dummy frame mechanism. All architectures should be using |
| generic dummy frames). */ |
| return legacy_saved_regs_unwind; |
| for (entry = table->head; entry != NULL; entry = entry->next) |
| { |
| if (entry->sniffer != NULL) |
| { |
| const struct frame_unwind *desc = NULL; |
| desc = entry->sniffer (next_frame); |
| if (desc != NULL) |
| return desc; |
| } |
| if (entry->unwinder != NULL) |
| { |
| if (entry->unwinder->sniffer (entry->unwinder, next_frame, |
| this_cache)) |
| return entry->unwinder; |
| } |
| } |
| return legacy_saved_regs_unwind; |
| } |
| |
| extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */ |
| |
| void |
| _initialize_frame_unwind (void) |
| { |
| frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init); |
| } |