/* Definitions for frame unwinder, for GDB, the GNU debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#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_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_sniffer_ftype *sniffer)
+struct frame_unwind_table
{
- table->sniffer = xrealloc (table->sniffer, ((table->nr + 1)
- * sizeof (frame_unwind_sniffer_ftype *)));
- 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_sniffer);
+ 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->sniffer = dummy_frame_sniffer;
+ /* The insertion point for OSABI sniffers. */
+ table->osabi_head = &table->list->next;
return table;
}
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);
- deprecated_set_gdbarch_data (gdbarch, frame_unwind_data, table);
- }
- append_predicate (table, sniffer);
+ 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_prepend_unwinder (struct gdbarch *gdbarch,
+ const struct frame_unwind *unwinder)
+{
+ 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 && legacy_frame_p (gdbarch))
- /* 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;
- desc = table->sniffer[i] (next_frame);
- 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;
}
void
_initialize_frame_unwind (void)
{
- frame_unwind_data = gdbarch_data_register_post_init (frame_unwind_init);
+ frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);
}