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/* Definitions for frame unwinder, 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.h"
#include "frame-unwind.h"
#include "gdb_assert.h"
#include "dummy-frame.h"
static struct gdbarch_data *frame_unwind_data;
struct frame_unwind_table
{
frame_unwind_p_ftype **p;
frame_unwind_sniffer_ftype **sniffer;
int nr;
};
/* Append a predicate to the end of the table. */
static void
append_predicate (struct frame_unwind_table *table, frame_unwind_p_ftype *p,
frame_unwind_sniffer_ftype *sniffer)
{
table->p = xrealloc (table->p, ((table->nr + 1)
* sizeof (frame_unwind_p_ftype *)));
table->sniffer = xrealloc (table->sniffer, ((table->nr + 1)
* sizeof (frame_unwind_sniffer_ftype *)));
table->p[table->nr] = p;
table->sniffer[table->nr] = sniffer;
table->nr++;
}
static void *
frame_unwind_init (struct gdbarch *gdbarch)
{
struct frame_unwind_table *table = XCALLOC (1, struct frame_unwind_table);
append_predicate (table, dummy_frame_p, NULL);
return table;
}
static void
frame_unwind_free (struct gdbarch *gdbarch, void *data)
{
struct frame_unwind_table *table =
gdbarch_data (gdbarch, frame_unwind_data);
xfree (table->p);
xfree (table->sniffer);
xfree (table);
}
void
frame_unwind_append_predicate (struct gdbarch *gdbarch,
frame_unwind_p_ftype *p)
{
struct frame_unwind_table *table =
gdbarch_data (gdbarch, frame_unwind_data);
if (table == NULL)
{
/* ULGH, called during architecture initialization. Patch
things up. */
table = frame_unwind_init (gdbarch);
set_gdbarch_data (gdbarch, frame_unwind_data, table);
}
append_predicate (table, p, NULL);
}
void
frame_unwind_append_sniffer (struct gdbarch *gdbarch,
frame_unwind_sniffer_ftype *sniffer)
{
struct frame_unwind_table *table =
gdbarch_data (gdbarch, frame_unwind_data);
if (table == NULL)
{
/* ULGH, called during architecture initialization. Patch
things up. */
table = frame_unwind_init (gdbarch);
set_gdbarch_data (gdbarch, frame_unwind_data, table);
}
append_predicate (table, NULL, sniffer);
}
const struct frame_unwind *
frame_unwind_find_by_frame (struct frame_info *next_frame)
{
int i;
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
/* Seriously old code. Don't even try to use this new mechanism.
(Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not
the dummy frame mechanism. All architectures should be using
generic dummy frames). */
return legacy_saved_regs_unwind;
for (i = 0; i < table->nr; i++)
{
const struct frame_unwind *desc;
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);
else
internal_error (__FILE__, __LINE__, "Missing sniffer?");
if (desc != NULL)
return desc;
}
return legacy_saved_regs_unwind;
}
extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
void
_initialize_frame_unwind (void)
{
frame_unwind_data = register_gdbarch_data (frame_unwind_init,
frame_unwind_free);
}
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