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* Re: c++/9588: memory fault when user throws exception from terminate()
@ 2003-02-05 21:56 fwang
0 siblings, 0 replies; 4+ messages in thread
From: fwang @ 2003-02-05 21:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/9588; it has been noted by GNATS.
From: fwang@ca.ibm.com
To: nathan@gcc.gnu.org, "Frank Wang" <fwang@ca.ibm.com>, gcc-bugs@gcc.gnu.org,
gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Cc:
Subject: Re: c++/9588: memory fault when user throws exception from terminate()
Date: Wed, 5 Feb 2003 16:52:25 -0500
Hi,
I think the real problem in calling terminate() function. according to
Spec.15.1.8 and Spec.15.5
If no exception is presently being handled, executing a throw-expression
with no operand calls terminate() (15.5.1).
If you try to compile and run following codes, you can get different result
in 32bit gcc and 64bit gcc.
//tmp.cpp
#include <exception>
struct S {
int i;
S() {i=1;}
};
int main(void)
{
try {
throw 'a';
}
catch (S) {
}
return 0;
}
For 32bit gcc: actual output: Abort
For 64ibt gcc: acutal output: Memory fault
Regards,
Frank Wang
VisualAge C/C++ Compiler Test
IBM Toronto Lab
Phone:(905) 413 - 2337 TieLine: 969 - 2337
Email: fwang@ca.ibm.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c++/9588: memory fault when user throws exception from terminate()
@ 2003-02-06 4:56 Alan Modra
0 siblings, 0 replies; 4+ messages in thread
From: Alan Modra @ 2003-02-06 4:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/9588; it has been noted by GNATS.
From: Alan Modra <amodra@bigpond.net.au>
To: fwang@ca.ibm.com
Cc: nathan@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: c++/9588: memory fault when user throws exception from terminate()
Date: Thu, 6 Feb 2003 15:17:30 +1030
I would guess that you have a library, most likely libc, built with
a buggy toolchain that didn't terminate .eh_frame with a zero. You
can use a recent (later than 2002-11-04) version of readelf to
display the terminator with something like
powerpc64-linux-readelf --debug-dump=frames \
/usr/local/powerpc64-linux/lib/libc.so.6 | grep ZERO
which should result in
xxxxxxxx ZERO terminator
As far as I know, Jakub Jelinek fixed the toolchain problem 2002-04-22.
--
Alan Modra
IBM OzLabs - Linux Technology Centre
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: c++/9588: memory fault when user throws exception from terminate()
@ 2003-02-05 20:15 nathan
0 siblings, 0 replies; 4+ messages in thread
From: nathan @ 2003-02-05 20:15 UTC (permalink / raw)
To: fwang, gcc-bugs, gcc-prs, nobody
Synopsis: memory fault when user throws exception from terminate()
State-Changed-From-To: open->closed
State-Changed-By: nathan
State-Changed-When: Wed Feb 5 20:15:56 2003
State-Changed-Why:
not a bug. your program is ill formed. the terminat function
shall terminate the program [18.6.3]
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9588
^ permalink raw reply [flat|nested] 4+ messages in thread
* c++/9588: memory fault when user throws exception from terminate()
@ 2003-02-05 19:46 fwang
0 siblings, 0 replies; 4+ messages in thread
From: fwang @ 2003-02-05 19:46 UTC (permalink / raw)
To: gcc-gnats
>Number: 9588
>Category: c++
>Synopsis: memory fault when user throws exception from terminate()
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Feb 05 19:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Frank Wang
>Release: gcc version 3.2
>Organization:
>Environment:
--enable-languages=c,c++,f77
--prefix=/opt/cross --host=powerpc-suse-linux
--target=powerpc64-linux
--enable-threads=posix
--disable-nls
--enable-shared
--with-headers=/usr/src/packages/BUILD/cross-ppc64-gcc-3.2/include-ppc64-glibc-2.2.5
>Description:
If user threw exception from terminate(), abort() function should be called. We used following codes to test this feathre by using 64bit g++, but got memory fault at running time
>How-To-Repeat:
Sample Source File:
===================
//tmp.cpp
using namespace std;
#include <exception>
struct S {
int i;
S() {i=1;}
};
void eh_term(void)
{
S s;
throw s;
}
int main(void)
{
set_terminate (&eh_term);
try {
throw 'a';
}
catch (S) {
}
return 0;
}
Test Process:
=============
STEP1: compiling and linking
/opt/cross/bin/powerpc64-linux-g++ tmp.cpp
STEP2: run
a.out
Actual Output:
=============
rc = 139
Error msg
Memory fault
Expected Output:
===============
rc = 134
Error msg
Abort
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 4+ messages in thread
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2003-02-05 21:56 c++/9588: memory fault when user throws exception from terminate() fwang
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2003-02-06 4:56 Alan Modra
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2003-02-05 19:46 fwang
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