Convert frame unwinders to use the current frame and

"struct value".

	* frame.c (frame_debug): Make global.
	(get_frame_id): Pass this frame to unwinder routines.
	(frame_pc_unwind): Remove unused unwind->prev_pc support.
	(do_frame_register_read): Do not discard the return value of
	frame_register_read.
	(frame_register_unwind): Remove debug messages.  Use
	frame_unwind_register_value.
	(frame_unwind_register_value, get_frame_register_value): New
	functions.
	(create_new_frame, get_frame_base_address, get_frame_locals_address)
	(get_frame_args_address, get_frame_type): Pass this frame to
	unwinder routines.
	(frame_cleanup_after_sniffer, frame_prepare_for_sniffer): New
	functions.
	* frame.h: Update comments.
	(frame_debug, frame_unwind_register_value, get_frame_register_value)
	(frame_prepare_for_sniffer): Declare.
	* frame-unwind.h: Update comments and parameter names.
	(default_frame_sniffer): Declare.
	(frame_prev_register_ftype): Return a struct value *.
	(struct frame_unwind): Remove prev_pc member.
	(frame_unwind_sniffer_ftype, frame_unwind_append_sniffer): Delete.
	(frame_unwind_append_unwinder, frame_unwind_got_optimized)
	(frame_unwind_got_register, frame_unwind_got_memory)
	(frame_unwind_got_constant, frame_unwind_got_address): Declare.
	* frame-base.h: Update comments and parameter names.
	* valops.c (value_fetch_lazy): Use get_frame_register_value.  Iterate
	if necessary.  Add debugging output.
	* sentinel-frame.c (sentinel_frame_prev_register)
	(sentinel_frame_this_id): Update for new signature.
	(sentinel_frame_prev_pc): Delete.
	(sentinel_frame_unwinder): Remove prev_pc.
	* ia64-tdep.c (ia64_libunwind_frame_unwind): Do not initialize
	prev_pc.
	* libunwind-frame.c (libunwind_frame_unwind): Likewise.
	* frame-unwind.c (struct frame_unwind_table_entry): Remove sniffer.
	(frame_unwind_append_sniffer): Delete.
	(frame_unwind_append_unwinder): New function.
	(frame_unwind_find_by_frame): Take this frame.  Only use sniffers
	from unwinders.  Use frame_prepare_for_sniffer.
	(default_frame_sniffer, frame_unwind_got_optimized)
	(frame_unwind_got_register, frame_unwind_got_memory)
	(frame_unwind_got_constant, frame_unwind_got_address): New functions.
	* dummy-frame.c (dummy_frame_sniffer): Use gdbarch_dummy_id.
	(dummy_frame_prev_register, dummy_frame_this_id): Update for new
	signature.
	* gdbarch.sh: Replace unwind_dummy_id with dummy_id.
	* gdbarch.c, gdbarch.c: Regenerated.
	* frame-base.c (default_frame_base_address)
	(default_frame_locals_address, default_frame_args_address): Update
	for new signature.
	(frame_base_find_by_frame): Pass this frame to unwinder routines.
	* infcall.c (call_function_by_hand): Update comments.
	* Makefile.in (frame-unwind.o): Update dependencies.

	* gdbint.texinfo (Stack Frames): New chapter.
	(Algorithms): Move Frames text to the new chapter.
	(Target Conditionals): Delete SAVE_DUMMY_FRAME_TOS.  Document
	gdbarch_dummy_id instead of gdbarch_unwind_dummy_id.
This commit is contained in:
Daniel Jacobowitz
2008-04-30 21:16:46 +00:00
parent 9214ee5f5f
commit 669fac235d
19 changed files with 687 additions and 321 deletions

View File

@ -622,24 +622,87 @@ value_fetch_lazy (struct value *val)
}
else if (VALUE_LVAL (val) == lval_register)
{
struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (val));
int regnum = VALUE_REGNUM (val);
struct frame_info *frame;
int regnum;
struct type *type = check_typedef (value_type (val));
struct value *new_val = val, *mark = value_mark ();
gdb_assert (frame != NULL);
/* Offsets are not supported here; lazy register values must
refer to the entire register. */
gdb_assert (value_offset (val) == 0);
/* Convertible register routines are used for multi-register
values and for interpretation in different types (e.g. float
or int from a double register). Lazy register values should
have the register's natural type, so they do not apply. */
gdb_assert (!gdbarch_convert_register_p (get_frame_arch (frame), regnum,
type));
while (VALUE_LVAL (new_val) == lval_register && value_lazy (new_val))
{
frame = frame_find_by_id (VALUE_FRAME_ID (new_val));
regnum = VALUE_REGNUM (new_val);
/* Get the data. */
if (!get_frame_register_bytes (frame, regnum, value_offset (val),
TYPE_LENGTH (value_type (val)),
value_contents_raw (val)))
gdb_assert (frame != NULL);
/* Convertible register routines are used for multi-register
values and for interpretation in different types
(e.g. float or int from a double register). Lazy
register values should have the register's natural type,
so they do not apply. */
gdb_assert (!gdbarch_convert_register_p (get_frame_arch (frame),
regnum, type));
new_val = get_frame_register_value (frame, regnum);
}
/* If it's still lazy (for instance, a saved register on the
stack), fetch it. */
if (value_lazy (new_val))
value_fetch_lazy (new_val);
/* If the register was not saved, mark it unavailable. */
if (value_optimized_out (new_val))
set_value_optimized_out (val, 1);
else
memcpy (value_contents_raw (val), value_contents (new_val),
TYPE_LENGTH (type));
if (frame_debug)
{
frame = frame_find_by_id (VALUE_FRAME_ID (val));
regnum = VALUE_REGNUM (val);
fprintf_unfiltered (gdb_stdlog, "\
{ value_fetch_lazy (frame=%d,regnum=%d(%s),...) ",
frame_relative_level (frame), regnum,
frame_map_regnum_to_name (frame, regnum));
fprintf_unfiltered (gdb_stdlog, "->");
if (value_optimized_out (new_val))
fprintf_unfiltered (gdb_stdlog, " optimized out");
else
{
int i;
const gdb_byte *buf = value_contents (new_val);
if (VALUE_LVAL (new_val) == lval_register)
fprintf_unfiltered (gdb_stdlog, " register=%d",
VALUE_REGNUM (new_val));
else if (VALUE_LVAL (new_val) == lval_memory)
fprintf_unfiltered (gdb_stdlog, " address=0x%s",
paddr_nz (VALUE_ADDRESS (new_val)));
else
fprintf_unfiltered (gdb_stdlog, " computed");
fprintf_unfiltered (gdb_stdlog, " bytes=");
fprintf_unfiltered (gdb_stdlog, "[");
for (i = 0;
i < register_size (get_frame_arch (frame), regnum);
i++)
fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
fprintf_unfiltered (gdb_stdlog, "]");
}
fprintf_unfiltered (gdb_stdlog, " }\n");
}
/* Dispose of the intermediate values. This prevents
watchpoints from trying to watch the saved frame pointer. */
value_free_to_mark (mark);
}
else
internal_error (__FILE__, __LINE__, "Unexpected lazy value type.");