| /* 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 *list; |
| /* The head of the OSABI part of the search list. */ |
| struct frame_unwind_table_entry **osabi_head; |
| }; |
| |
| static void * |
| frame_unwind_init (struct obstack *obstack) |
| { |
| struct frame_unwind_table *table |
| = OBSTACK_ZALLOC (obstack, struct frame_unwind_table); |
| /* Start the table out with a few default sniffers. OSABI code |
| can't override this. */ |
| table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry); |
| table->list->unwinder = dummy_frame_unwind; |
| /* The insertion point for OSABI sniffers. */ |
| table->osabi_head = &table->list->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); |
| struct frame_unwind_table_entry **ip; |
| |
| /* Find the end of the list and insert the new entry there. */ |
| for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next); |
| (*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); |
| (*ip)->sniffer = sniffer; |
| } |
| |
| void |
| frame_unwind_prepend_unwinder (struct gdbarch *gdbarch, |
| const struct frame_unwind *unwinder) |
| { |
| struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data); |
| struct frame_unwind_table_entry *entry; |
| |
| /* Insert the new entry at the start of the list. */ |
| entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry); |
| entry->unwinder = unwinder; |
| entry->next = (*table->osabi_head); |
| (*table->osabi_head) = entry; |
| } |
| |
| 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; |
| for (entry = table->list; 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; |
| } |
| } |
| internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed")); |
| } |
| |
| 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); |
| } |