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/* Definitions for frame unwinder, for GDB, the GNU debugger.
Copyright (C) 2003, 2004, 2007 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, 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);
}
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