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2003-07-18 Andrew Cagney <cagney@redhat.com>

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* dwarf2-frame.c (dwarf2_frame_sniffer): Use
	frame_unwind_address_in_block, instead of frame_pc_unwind.
	(dwarf2_frame_cache): Ditto.
This commit is contained in:
Andrew Cagney 2003-07-18 19:59:27 +00:00
parent e6e5e94cb8
commit 1ce5d6dda5
2 changed files with 17 additions and 18 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2003-07-18 Andrew Cagney <cagney@redhat.com>
* dwarf2-frame.c (dwarf2_frame_sniffer): Use
frame_unwind_address_in_block, instead of frame_pc_unwind.
(dwarf2_frame_cache): Ditto.
2003-07-18 Andrew Cagney <cagney@redhat.com>
* user-regs.h (struct gdbarch): Declare opaque.

29
gdb/dwarf2-frame.c
View File

@ -491,15 +491,12 @@ dwarf2_frame_cache (struct frame_info *next_frame, void **this_cache)
done for "normal" frames and not for resume-type frames (signal
handlers, sentinel frames, dummy frames).
We don't do what GCC's does here (yet). It's not clear how
reliable the method is. There's also a problem with finding the
right FDE; see the comment in dwarf_frame_p. If dwarf_frame_p
selected this frame unwinder because it found the FDE for the
next function, using the adjusted return address might not yield
a FDE at all. The problem isn't specific to DWARF CFI; other
unwinders loose in similar ways. Therefore it's probably
acceptable to leave things slightly broken for now. */
fs->pc = frame_pc_unwind (next_frame);
frame_unwind_address_in_block does just this.
It's not clear how reliable the method is though - there is the
potential for the register state pre-call being different to that
on return. */
fs->pc = frame_unwind_address_in_block (next_frame);
/* Find the correct FDE. */
fde = dwarf2_frame_find_fde (&fs->pc);
@ -710,15 +707,11 @@ static const struct frame_unwind dwarf2_frame_unwind =
const struct frame_unwind *
dwarf2_frame_sniffer (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
/* The way GDB works, this function can be called with PC just after
the last instruction of the function we're supposed to return the
unwind methods for. In that case we won't find the correct FDE;
instead we find the FDE for the next function, or we won't find
an FDE at all. There is a possible solution (see the comment in
dwarf2_frame_cache), GDB doesn't pass us enough information to
implement it. */
if (dwarf2_frame_find_fde (&pc))
/* Grab an address that is guarenteed to reside somewhere within the
function. frame_pc_unwind(), for a no-return next function, can
end up returning something past the end of this function's body. */
CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame);
if (dwarf2_frame_find_fde (&block_addr))
return &dwarf2_frame_unwind;
return NULL;