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/* Definitions for frame address handler, for GDB, the GNU debugger.
Copyright 2003 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame-base.h"
#include "frame.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 *next_frame, void **this_cache)
{
struct frame_info *this_frame = get_prev_frame (next_frame);
return get_frame_base (this_frame); /* sigh! */
}
static CORE_ADDR
default_frame_locals_address (struct frame_info *next_frame, void **this_cache)
{
if (DEPRECATED_FRAME_LOCALS_ADDRESS_P ())
{
/* This is bad. The computation of per-frame locals address
should use a per-frame frame-base. */
struct frame_info *this_frame = get_prev_frame (next_frame);
return DEPRECATED_FRAME_LOCALS_ADDRESS (this_frame);
}
return default_frame_base_address (next_frame, this_cache);
}
static CORE_ADDR
default_frame_args_address (struct frame_info *next_frame, void **this_cache)
{
if (DEPRECATED_FRAME_ARGS_ADDRESS_P ())
{
struct frame_info *this_frame = get_prev_frame (next_frame);
return DEPRECATED_FRAME_ARGS_ADDRESS (this_frame);
}
return default_frame_base_address (next_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
};
static struct gdbarch_data *frame_base_data;
struct frame_base_table
{
frame_base_p_ftype **p;
frame_base_sniffer_ftype **sniffer;
const struct frame_base *default_base;
int nr;
};
static void *
frame_base_init (struct gdbarch *gdbarch)
{
struct frame_base_table *table = XCALLOC (1, struct frame_base_table);
table->default_base = &default_frame_base;
return table;
}
static void
frame_base_free (struct gdbarch *gdbarch, void *data)
{
struct frame_base_table *table =
gdbarch_data (gdbarch, frame_base_data);
xfree (table->p);
xfree (table->sniffer);
xfree (table);
}
static struct frame_base_table *
frame_base_table (struct gdbarch *gdbarch)
{
struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
if (table == NULL)
{
/* ULGH, called during architecture initialization. Patch
things up. */
table = frame_base_init (gdbarch);
set_gdbarch_data (gdbarch, frame_base_data, table);
}
return table;
}
/* Append a predicate to the end of the table. */
static void
append_predicate (struct frame_base_table *table, frame_base_p_ftype *p,
frame_base_sniffer_ftype *sniffer)
{
table->p = xrealloc (table->p, ((table->nr + 1)
* sizeof (frame_base_p_ftype *)));
table->sniffer = xrealloc (table->sniffer,
((table->nr + 1)
* sizeof (frame_base_sniffer_ftype *)));
table->p[table->nr] = p;
table->sniffer[table->nr] = sniffer;
table->nr++;
}
void
frame_base_append_predicate (struct gdbarch *gdbarch,
frame_base_p_ftype *p)
{
struct frame_base_table *table = frame_base_table (gdbarch);
append_predicate (table, p, NULL);
}
void
frame_base_append_sniffer (struct gdbarch *gdbarch,
frame_base_sniffer_ftype *sniffer)
{
struct frame_base_table *table = frame_base_table (gdbarch);
append_predicate (table, NULL, sniffer);
}
void
frame_base_set_default (struct gdbarch *gdbarch,
const struct frame_base *default_base)
{
struct frame_base_table *table = frame_base_table (gdbarch);
table->default_base = default_base;
}
const struct frame_base *
frame_base_find_by_frame (struct frame_info *next_frame)
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct frame_base_table *table = frame_base_table (gdbarch);
int i;
for (i = 0; i < table->nr; i++)
{
const struct frame_base *desc = NULL;
if (table->p[i] != NULL)
desc = table->p[i] (frame_pc_unwind (next_frame));
else if (table->sniffer[i] != NULL)
desc = table->sniffer[i] (next_frame);
if (desc != NULL)
return desc;
}
return table->default_base;
}
extern initialize_file_ftype _initialize_frame_base; /* -Wmissing-prototypes */
void
_initialize_frame_base (void)
{
frame_base_data = register_gdbarch_data (frame_base_init,
frame_base_free);
}
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