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* Re: c++/7754: ICE SIGSEGV on union with template parameter
@ 2002-10-03 0:05 mmitchel
0 siblings, 0 replies; 5+ messages in thread
From: mmitchel @ 2002-10-03 0:05 UTC (permalink / raw)
To: dv, gcc-bugs, gcc-prs, mmitchel, nobody
Synopsis: ICE SIGSEGV on union with template parameter
Responsible-Changed-From-To: unassigned->mmitchel
Responsible-Changed-By: mmitchel
Responsible-Changed-When: Thu Oct 3 00:05:02 2002
Responsible-Changed-Why:
Working on a fix.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7754
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: c++/7754: ICE SIGSEGV on union with template parameter
@ 2002-10-03 22:25 mmitchel
0 siblings, 0 replies; 5+ messages in thread
From: mmitchel @ 2002-10-03 22:25 UTC (permalink / raw)
To: dv, gcc-bugs, gcc-prs, mmitchel
Synopsis: ICE SIGSEGV on union with template parameter
State-Changed-From-To: analyzed->closed
State-Changed-By: mmitchel
State-Changed-When: Thu Oct 3 22:25:08 2002
State-Changed-Why:
Fixed in G++ 3.2.1.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7754
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: c++/7754: ICE SIGSEGV on union with template parameter
@ 2002-09-29 1:36 Pop Sébastian
0 siblings, 0 replies; 5+ messages in thread
From: Pop Sébastian @ 2002-09-29 1:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7754; it has been noted by GNATS.
From: =?iso-8859-1?Q?Pop_S=E9bastian?= <pop@gauvain.u-strasbg.fr>
To: nathan@gcc.gnu.org, dv@vollmann.ch, gcc-bugs@gcc.gnu.org,
gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Cc: aoliva@redhat.com
Subject: Re: c++/7754: ICE SIGSEGV on union with template parameter
Date: Sun, 29 Sep 2002 10:29:05 +0200
On Fri, Sep 13, 2002 at 09:04:23PM -0000, nathan@gcc.gnu.org wrote:
> Synopsis: ICE SIGSEGV on union with template parameter
>
> State-Changed-From-To: open->analyzed
> State-Changed-By: nathan
> State-Changed-When: Fri Sep 13 14:04:22 2002
> State-Changed-Why:
> confirmed as a regression
>
> http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7754
SIGSEGV happens in tree.c:
/* Nonzero if integer constants T1 and T2 represent values that satisfy <.
The precise way of comparison depends on their data type. */
int
tree_int_cst_lt (t1, t2)
tree t1, t2;
{
if (t1 == t2)
return 0;
=>if (TREE_UNSIGNED (TREE_TYPE (t1)) != TREE_UNSIGNED (TREE_TYPE (t2)))
{
int t1_sgn = tree_int_cst_sgn (t1);
int t2_sgn = tree_int_cst_sgn (t2);
if (t1_sgn < t2_sgn)
return 1;
else if (t1_sgn > t2_sgn)
return 0;
/* Otherwise, both are non-negative, so we compare them as
unsigned just in case one of them would overflow a signed
type. */
}
else if (! TREE_UNSIGNED (TREE_TYPE (t1)))
return INT_CST_LT (t1, t2);
return INT_CST_LT_UNSIGNED (t1, t2);
}
At this point t2 is equal to 0, and that crashes the compiler.
The following patch introduced this code without checking of non-NULL for t2:
2002-04-26 Alexandre Oliva <aoliva@redhat.com>
http://gcc.gnu.org/ml/gcc-patches/2002-04/msg01549.html
Alexandre, could you review this patch and the associated bug-report please?
Thanks,
Sebastian
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: c++/7754: ICE SIGSEGV on union with template parameter
@ 2002-09-13 14:04 nathan
0 siblings, 0 replies; 5+ messages in thread
From: nathan @ 2002-09-13 14:04 UTC (permalink / raw)
To: dv, gcc-bugs, gcc-prs, nobody
Synopsis: ICE SIGSEGV on union with template parameter
State-Changed-From-To: open->analyzed
State-Changed-By: nathan
State-Changed-When: Fri Sep 13 14:04:22 2002
State-Changed-Why:
confirmed as a regression
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7754
^ permalink raw reply [flat|nested] 5+ messages in thread
* c++/7754: ICE SIGSEGV on union with template parameter
@ 2002-08-28 18:36 Detlef Vollmann
0 siblings, 0 replies; 5+ messages in thread
From: Detlef Vollmann @ 2002-08-28 18:36 UTC (permalink / raw)
To: gcc-gnats
>Number: 7754
>Category: c++
>Synopsis: ICE SIGSEGV on union with template parameter
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Wed Aug 28 18:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Detlef Vollmann
>Release: 3.3 20020828 (experimental)
>Organization:
vollmann engineering gmbh
>Environment:
System: Linux octo 2.4.18-xfs-1.1 #1 Mon Jul 1 05:12:32 MEST 2002 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: /dwarf/pdsrc/gcc/cvs/gcc/configure --program-suffix=-test --prefix=/usr/local/gcc-test --enable-shared --enable-threads=posix --enable-version-specific-runtime-libs --enable-languages=c,c++
>Description:
Segmentation fault wrapped as ICE for a union with a member
whose type is a template parameter of surrounding function.
>How-To-Repeat:
gcc -c bug.cpp
>Fix:
bug.cpp:
template <typename T> void f(T const &t)
{
union { char c; T t_; }; // compile time check for T==POD
}
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2002-10-04 5:25 UTC | newest]
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2002-10-03 0:05 c++/7754: ICE SIGSEGV on union with template parameter mmitchel
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