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Remove the special casing of ia64 for GetIPInfo()

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This rule (no IP adjustment on ia64) may be correct for locating the right FDE.

Unfortunately the same adjusted/unadjusted return address is being used also by
__gxx_personality_v0() to locate the right call-site (the try {} block) for
unwinding.  And this case is already sensitive for off-by-one PC values.
Unlike the FDE location where the function prologue + epilogue make it immune
against off-by-one PC calculations.

Therefore suggesting to unify it with non-ia64 case.

Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
This commit is contained in:
Arun Sharma 2009-04-24 11:10:08 -07:00
parent b483ea3f0e
commit 4b8404d153
2 changed files with 2 additions and 50 deletions
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9
src/Makefile.am
View file

@ -69,13 +69,8 @@ libunwind_la_SOURCES_local_unwind = \
unwind/GetGR.c unwind/GetIP.c unwind/GetLanguageSpecificData.c \
unwind/GetRegionStart.c unwind/GetTextRelBase.c \
unwind/RaiseException.c unwind/Resume.c \
unwind/Resume_or_Rethrow.c unwind/SetGR.c unwind/SetIP.c
if ARCH_IA64
libunwind_la_SOURCES_local_unwind += ia64/unwind_GetIPInfo.c
else
libunwind_la_SOURCES_local_unwind += unwind/GetIPInfo.c
endif # ARCH_IA64
unwind/Resume_or_Rethrow.c unwind/SetGR.c unwind/SetIP.c \
unwind/GetIPInfo.c
# _ReadULEB()/_ReadSLEB() are needed for Intel C++ 8.0 compatibility
libunwind_la_SOURCES_os_linux_local = mi/_ReadULEB.c mi/_ReadSLEB.c

43
src/ia64/unwind_GetIPInfo.c
View file

@ -1,43 +0,0 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2009 Red Hat
Contributed by Jan Kratochvil <jan.kratochvil@redhat.com>
This file is part of libunwind.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "../unwind/unwind-internal.h"
/* gcc/unwind-dw2.c: Retrieve the return address and flag whether that IP is
before or after first not yet fully executed instruction.
IP_BEFORE_INSN ensures leaving IP intact as was designed for ia64. */
PROTECTED unsigned long
_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
{
unw_word_t val;
unw_get_reg (&context->cursor, UNW_REG_IP, &val);
*ip_before_insn = 1;
return val;
}
unsigned long __libunwind_Unwind_GetIPInfo (struct _Unwind_Context *, int *)
ALIAS (_Unwind_GetIPInfo);