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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [frame-base.c] - Blame information for rev 827

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1 24 jeremybenn
/* Definitions for frame address handler, for GDB, the GNU debugger.
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   Copyright (C) 2003, 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "frame-base.h"
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#include "frame.h"
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#include "gdb_obstack.h"
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/* A default frame base implementations.  If it wasn't for the old
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   DEPRECATED_FRAME_LOCALS_ADDRESS and DEPRECATED_FRAME_ARGS_ADDRESS,
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   these could be combined into a single function.  All architectures
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   really need to override this.  */
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static CORE_ADDR
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default_frame_base_address (struct frame_info *next_frame, void **this_cache)
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{
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  struct frame_info *this_frame = get_prev_frame (next_frame);
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  return get_frame_base (this_frame); /* sigh! */
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}
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static CORE_ADDR
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default_frame_locals_address (struct frame_info *next_frame, void **this_cache)
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{
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  return default_frame_base_address (next_frame, this_cache);
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}
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static CORE_ADDR
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default_frame_args_address (struct frame_info *next_frame, void **this_cache)
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{
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  return default_frame_base_address (next_frame, this_cache);
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}
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const struct frame_base default_frame_base = {
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  NULL, /* No parent.  */
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  default_frame_base_address,
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  default_frame_locals_address,
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  default_frame_args_address
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};
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static struct gdbarch_data *frame_base_data;
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struct frame_base_table_entry
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{
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  frame_base_sniffer_ftype *sniffer;
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  struct frame_base_table_entry *next;
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};
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struct frame_base_table
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{
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  struct frame_base_table_entry *head;
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  struct frame_base_table_entry **tail;
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  const struct frame_base *default_base;
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};
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static void *
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frame_base_init (struct obstack *obstack)
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{
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  struct frame_base_table *table
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    = OBSTACK_ZALLOC (obstack, struct frame_base_table);
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  table->tail = &table->head;
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  table->default_base = &default_frame_base;
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  return table;
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}
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void
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frame_base_append_sniffer (struct gdbarch *gdbarch,
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                           frame_base_sniffer_ftype *sniffer)
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{
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  struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
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  (*table->tail) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_base_table_entry);
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  (*table->tail)->sniffer = sniffer;
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  table->tail = &(*table->tail)->next;
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}
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void
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frame_base_set_default (struct gdbarch *gdbarch,
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                        const struct frame_base *default_base)
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{
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  struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
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  table->default_base = default_base;
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}
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const struct frame_base *
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frame_base_find_by_frame (struct frame_info *next_frame)
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{
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  struct gdbarch *gdbarch = get_frame_arch (next_frame);
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  struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
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  struct frame_base_table_entry *entry;
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  for (entry = table->head; entry != NULL; entry = entry->next)
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    {
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      const struct frame_base *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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  return table->default_base;
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}
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extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
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void
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_initialize_frame_base (void)
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{
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  frame_base_data = gdbarch_data_register_pre_init (frame_base_init);
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}

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