/* Definitions for frame unwinder, for GDB, the GNU debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ 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 2 of the License, or
+ 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,
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. */
+ 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
+struct frame_unwind_table_entry
{
- frame_unwind_p_ftype **p;
- frame_unwind_sniffer_ftype **sniffer;
- int nr;
+ frame_unwind_sniffer_ftype *sniffer;
+ const struct frame_unwind *unwinder;
+ struct frame_unwind_table_entry *next;
};
-/* 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)
+struct frame_unwind_table
{
- 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++;
-}
+ 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 gdbarch *gdbarch)
+frame_unwind_init (struct obstack *obstack)
{
- struct frame_unwind_table *table = XCALLOC (1, struct frame_unwind_table);
- append_predicate (table, dummy_frame_p, NULL);
+ 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;
}
-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)
+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, p, NULL);
+ 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_append_sniffer (struct gdbarch *gdbarch,
- frame_unwind_sniffer_ftype *sniffer)
+frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
+ const struct frame_unwind *unwinder)
{
- 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);
+ 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)
+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);
- 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++)
+ struct frame_unwind_table_entry *entry;
+ for (entry = table->list; entry != NULL; entry = entry->next)
{
- 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;
+ 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;
+ }
}
- return legacy_saved_regs_unwind;
+ 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 = register_gdbarch_data (frame_unwind_init,
- frame_unwind_free);
+ frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);
}
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