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/* Definitions for frame address handler, for GDB, the GNU debugger.
Copyright (C) 2003-2022 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-base.h"
#include "frame.h"
#include "gdbsupport/gdb_obstack.h"
#include "gdbarch.h"
/* A default frame base implementations. If it wasn't for the old
DEPRECATED_FRAME_LOCALS_ADDRESS and DEPRECATED_FRAME_ARGS_ADDRESS,
these could be combined into a single function. All architectures
really need to override this. */
static CORE_ADDR
default_frame_base_address (struct frame_info *this_frame, void **this_cache)
{
return get_frame_base (this_frame); /* sigh! */
}
static CORE_ADDR
default_frame_locals_address (struct frame_info *this_frame, void **this_cache)
{
return default_frame_base_address (this_frame, this_cache);
}
static CORE_ADDR
default_frame_args_address (struct frame_info *this_frame, void **this_cache)
{
return default_frame_base_address (this_frame, this_cache);
}
const struct frame_base default_frame_base = {
NULL, /* No parent. */
default_frame_base_address,
default_frame_locals_address,
default_frame_args_address
};
struct frame_base_table_entry
{
frame_base_sniffer_ftype *sniffer;
struct frame_base_table_entry *next;
};
struct frame_base_table
{
struct frame_base_table_entry *head = nullptr;
struct frame_base_table_entry **tail = &head;
const struct frame_base *default_base = &default_frame_base;
};
static const registry<gdbarch>::key<struct frame_base_table> frame_base_data;
static struct frame_base_table *
get_frame_base_table (struct gdbarch *gdbarch)
{
struct frame_base_table *table = frame_base_data.get (gdbarch);
if (table == nullptr)
table = frame_base_data.emplace (gdbarch);
return table;
}
void
frame_base_append_sniffer (struct gdbarch *gdbarch,
frame_base_sniffer_ftype *sniffer)
{
struct frame_base_table *table = get_frame_base_table (gdbarch);
(*table->tail)
= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_base_table_entry);
(*table->tail)->sniffer = sniffer;
table->tail = &(*table->tail)->next;
}
void
frame_base_set_default (struct gdbarch *gdbarch,
const struct frame_base *default_base)
{
struct frame_base_table *table = get_frame_base_table (gdbarch);
table->default_base = default_base;
}
const struct frame_base *
frame_base_find_by_frame (struct frame_info *this_frame)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct frame_base_table *table = get_frame_base_table (gdbarch);
struct frame_base_table_entry *entry;
for (entry = table->head; entry != NULL; entry = entry->next)
{
const struct frame_base *desc = NULL;
desc = entry->sniffer (this_frame);
if (desc != NULL)
return desc;
}
return table->default_base;
}
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