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/* Definitions for frame unwinder, for GDB, the GNU debugger.

   Copyright (C) 2003, 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>.  */

#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);

}