118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/* Definitions for frame unwinder, for GDB, the GNU debugger.
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Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "frame-unwind.h"
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#include "gdb_assert.h"
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#include "dummy-frame.h"
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#include "gdb_obstack.h"
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static struct gdbarch_data *frame_unwind_data;
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struct frame_unwind_table_entry
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{
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frame_unwind_sniffer_ftype *sniffer;
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const struct frame_unwind *unwinder;
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struct frame_unwind_table_entry *next;
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};
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struct frame_unwind_table
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{
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struct frame_unwind_table_entry *list;
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/* The head of the OSABI part of the search list. */
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struct frame_unwind_table_entry **osabi_head;
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};
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static void *
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frame_unwind_init (struct obstack *obstack)
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{
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struct frame_unwind_table *table
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= OBSTACK_ZALLOC (obstack, struct frame_unwind_table);
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/* Start the table out with a few default sniffers. OSABI code
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can't override this. */
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table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
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table->list->unwinder = dummy_frame_unwind;
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/* The insertion point for OSABI sniffers. */
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table->osabi_head = &table->list->next;
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return table;
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}
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void
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frame_unwind_append_sniffer (struct gdbarch *gdbarch,
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frame_unwind_sniffer_ftype *sniffer)
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{
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struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
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struct frame_unwind_table_entry **ip;
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/* Find the end of the list and insert the new entry there. */
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for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next);
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(*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
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(*ip)->sniffer = sniffer;
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}
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void
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frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
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const struct frame_unwind *unwinder)
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{
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struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
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struct frame_unwind_table_entry *entry;
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/* Insert the new entry at the start of the list. */
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entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
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entry->unwinder = unwinder;
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entry->next = (*table->osabi_head);
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(*table->osabi_head) = entry;
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}
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const struct frame_unwind *
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frame_unwind_find_by_frame (struct frame_info *next_frame, void **this_cache)
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{
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int i;
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
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struct frame_unwind_table_entry *entry;
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for (entry = table->list; entry != NULL; entry = entry->next)
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{
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if (entry->sniffer != NULL)
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{
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const struct frame_unwind *desc = NULL;
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desc = entry->sniffer (next_frame);
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if (desc != NULL)
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return desc;
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}
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if (entry->unwinder != NULL)
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{
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if (entry->unwinder->sniffer (entry->unwinder, next_frame,
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this_cache))
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return entry->unwinder;
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}
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}
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internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed"));
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}
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extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
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void
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_initialize_frame_unwind (void)
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{
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frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);
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}
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