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Reset *THIS_CACHE in frame_unwind_try_unwinder in case of exception

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It is required that unwinder->sniffer should set *this_cache to NULL if
the unwinder is not applicable or exception is thrown, so
78ac5f831692f70b841044961069e50d4ba6a76f adds clear_pointer_cleanup to set
*this_cache to NULL in case of exception in order to fix PR 14100.
https://sourceware.org/ml/gdb-patches/2012-08/msg00075.html

This patch removes that clear_pointer_cleanup, and catch all exception in
the caller of unwinder->sniffer.  In case of exception, reset *this_case.

gdb:

2017-08-11  Yao Qi  <yao.qi@linaro.org>

	* dwarf2-frame.c (clear_pointer_cleanup): Remove.
	(dwarf2_frame_cache): Remove reset_cache_cleanup.
	(dwarf2_frame_cache):
	* frame-unwind.c (frame_unwind_try_unwinder): Catch
	RETURN_MASK_ALL and set *this_case to NULL.
	* frame-unwind.h: Update comments.
This commit is contained in:
Yao Qi
2017-08-11 09:30:02 +01:00
parent 1c90d9f022
commit be7d3cd5f1
4 changed files with 17 additions and 16 deletions
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7
gdb/frame-unwind.c
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@ -106,8 +106,11 @@ frame_unwind_try_unwinder (struct frame_info *this_frame, void **this_cache,
{
res = unwinder->sniffer (unwinder, this_frame, this_cache);
}
CATCH (ex, RETURN_MASK_ERROR)
CATCH (ex, RETURN_MASK_ALL)
{
/* Catch all exceptions, caused by either interrupt or error.
Reset *THIS_CACHE. */
*this_cache = NULL;
if (ex.error == NOT_AVAILABLE_ERROR)
{
/* This usually means that not even the PC is available,
@ -128,6 +131,8 @@ frame_unwind_try_unwinder (struct frame_info *this_frame, void **this_cache,
}
else
{
/* Don't set *THIS_CACHE to NULL here, because sniffer has to do
so. */
do_cleanups (old_cleanup);
return 0;
}