/* Definitions for frame unwinder, for GDB, the GNU debugger.
- Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2003-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "inline-frame.h"
#include "value.h"
#include "regcache.h"
-
-#include "gdb_assert.h"
#include "gdb_obstack.h"
+#include "target.h"
+#include "gdbarch.h"
static struct gdbarch_data *frame_unwind_data;
can't override this. */
table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
table->list->unwinder = &dummy_frame_unwind;
- table->list->next = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
+ table->list->next = OBSTACK_ZALLOC (obstack,
+ struct frame_unwind_table_entry);
table->list->next->unwinder = &inline_frame_unwind;
/* The insertion point for OSABI sniffers. */
table->osabi_head = &table->list->next->next;
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 *table
+ = (struct frame_unwind_table *) gdbarch_data (gdbarch, frame_unwind_data);
struct frame_unwind_table_entry *entry;
/* Insert the new entry at the start of the list. */
frame_unwind_append_unwinder (struct gdbarch *gdbarch,
const struct frame_unwind *unwinder)
{
- struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
+ struct frame_unwind_table *table
+ = (struct frame_unwind_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. */
(*ip)->unwinder = unwinder;
}
+/* Call SNIFFER from UNWINDER. If it succeeded set UNWINDER for
+ THIS_FRAME and return 1. Otherwise the function keeps THIS_FRAME
+ unchanged and returns 0. */
+
+static int
+frame_unwind_try_unwinder (struct frame_info *this_frame, void **this_cache,
+ const struct frame_unwind *unwinder)
+{
+ int res = 0;
+
+ frame_prepare_for_sniffer (this_frame, unwinder);
+
+ try
+ {
+ res = unwinder->sniffer (unwinder, this_frame, this_cache);
+ }
+ catch (const gdb_exception &ex)
+ {
+ /* Catch all exceptions, caused by either interrupt or error.
+ Reset *THIS_CACHE. */
+ *this_cache = NULL;
+ frame_cleanup_after_sniffer (this_frame);
+
+ if (ex.error == NOT_AVAILABLE_ERROR)
+ {
+ /* This usually means that not even the PC is available,
+ thus most unwinders aren't able to determine if they're
+ the best fit. Keep trying. Fallback prologue unwinders
+ should always accept the frame. */
+ return 0;
+ }
+ throw;
+ }
+
+ if (res)
+ return 1;
+ else
+ {
+ /* Don't set *THIS_CACHE to NULL here, because sniffer has to do
+ so. */
+ frame_cleanup_after_sniffer (this_frame);
+ return 0;
+ }
+ gdb_assert_not_reached ("frame_unwind_try_unwinder");
+}
+
/* Iterate through sniffers for THIS_FRAME frame until one returns with an
unwinder implementation. THIS_FRAME->UNWIND must be NULL, it will get set
by this function. Possibly initialize THIS_CACHE. */
frame_unwind_find_by_frame (struct frame_info *this_frame, void **this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
- struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
+ struct frame_unwind_table *table
+ = (struct frame_unwind_table *) gdbarch_data (gdbarch, frame_unwind_data);
struct frame_unwind_table_entry *entry;
+ const struct frame_unwind *unwinder_from_target;
+
+ unwinder_from_target = target_get_unwinder ();
+ if (unwinder_from_target != NULL
+ && frame_unwind_try_unwinder (this_frame, this_cache,
+ unwinder_from_target))
+ return;
+
+ unwinder_from_target = target_get_tailcall_unwinder ();
+ if (unwinder_from_target != NULL
+ && frame_unwind_try_unwinder (this_frame, this_cache,
+ unwinder_from_target))
+ return;
for (entry = table->list; entry != NULL; entry = entry->next)
- {
- struct cleanup *old_cleanup;
+ if (frame_unwind_try_unwinder (this_frame, this_cache, entry->unwinder))
+ return;
- old_cleanup = frame_prepare_for_sniffer (this_frame, entry->unwinder);
- if (entry->unwinder->sniffer (entry->unwinder, this_frame,
- this_cache))
- {
- discard_cleanups (old_cleanup);
- return;
- }
- do_cleanups (old_cleanup);
- }
internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed"));
}
return 1;
}
+/* The default frame unwinder stop_reason callback. */
+
+enum unwind_stop_reason
+default_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ struct frame_id this_id = get_frame_id (this_frame);
+
+ if (frame_id_eq (this_id, outer_frame_id))
+ return UNWIND_OUTERMOST;
+ else
+ return UNWIND_NO_REASON;
+}
+
+/* See frame-unwind.h. */
+
+CORE_ADDR
+default_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ int pc_regnum = gdbarch_pc_regnum (gdbarch);
+ CORE_ADDR pc = frame_unwind_register_unsigned (next_frame, pc_regnum);
+ pc = gdbarch_addr_bits_remove (gdbarch, pc);
+ return pc;
+}
+
+/* See frame-unwind.h. */
+
+CORE_ADDR
+default_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ int sp_regnum = gdbarch_sp_regnum (gdbarch);
+ return frame_unwind_register_unsigned (next_frame, sp_regnum);
+}
+
/* Helper functions for value-based register unwinding. These return
a (possibly lazy) value of the appropriate type. */
frame_unwind_got_optimized (struct frame_info *frame, int regnum)
{
struct gdbarch *gdbarch = frame_unwind_arch (frame);
- struct value *reg_val;
-
- reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
- set_value_optimized_out (reg_val, 1);
- return reg_val;
+ struct type *type = register_type (gdbarch, regnum);
+ struct value *val;
+
+ /* Return an lval_register value, so that we print it as
+ "<not saved>". */
+ val = allocate_value_lazy (type);
+ set_value_lazy (val, 0);
+ mark_value_bytes_optimized_out (val, 0, TYPE_LENGTH (type));
+ VALUE_LVAL (val) = lval_register;
+ VALUE_REGNUM (val) = regnum;
+ VALUE_NEXT_FRAME_ID (val)
+ = get_frame_id (get_next_frame_sentinel_okay (frame));
+ return val;
}
/* Return a value which indicates that FRAME copied REGNUM into
register NEW_REGNUM. */
struct value *
-frame_unwind_got_register (struct frame_info *frame, int regnum, int new_regnum)
+frame_unwind_got_register (struct frame_info *frame,
+ int regnum, int new_regnum)
{
return value_of_register_lazy (frame, new_regnum);
}
return reg_val;
}
-extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
-
void
_initialize_frame_unwind (void)
{