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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Closed: (STDCXX-316) std::valarray::cshift uses uninitialized storage
Date Tue, 22 Apr 2008 03:25:21 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor closed STDCXX-316.
-------------------------------


Regression test committed in [r650366|http://svn.apache.org/viewvc?rev=650366&view=rev]
and verified with gcc 4.1.2 (required a change to {{valarray.cc}} to compile -- see [r650367|http://svn.apache.org/viewvc?rev=650367&view=rev]).

> std::valarray::cshift uses uninitialized storage
> ------------------------------------------------
>
>                 Key: STDCXX-316
>                 URL: https://issues.apache.org/jira/browse/STDCXX-316
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 26. Numerics
>    Affects Versions: 4.1.2, 4.1.3
>         Environment: all
>            Reporter: Martin Sebor
>            Assignee: Martin Sebor
>             Fix For: 4.2.0
>
>
> The program below is designed to detect memory corruption (such as the use of uninitialized
storage) in valarray. When compiled with the latest trunk it aborts at runtime. 
> $ cat t.cpp && nice gmake t && ./t
> #include <cassert>
> #include <valarray>
> struct S {
>     const S* const self;
>     S (): self (this) { }
>     S (const S &s): self (this) { assert (&s == s.self); }
>     ~S () { assert (this == self); }
>     void operator= (const S &s) { assert (this == self && &s == s.self);
}
> };
> int main ()
> {
>     const std::valarray<S> a (2);
>     a.cshift (1);
> } 
> aCC -c -I/nfs/devco/sebor/dev/stdlib/include/ansi -I/usr/include  -D_RWSTDDEBUG   -mt
-D_RWSTD_USE_CONFIG -I/nfs/devco/sebor/dev/stdlib/include -I/build/sebor/aCC-3.70-15S/include
-I/nfs/devco/sebor/dev/stdlib/examples/include  -Aa +nostl  -g +d  +DD64 +w +W392 +W655 +W684
+W818 +W819 +W849   t.cpp
> aCC t.o -o t -Aa +nostl -Wl,+s -Wl,+vnocompatwarnings   -mt +DD64 -L/build/sebor/aCC-3.70-15S/lib
-lstd15S   -lm 
> Assertion failed: this == self && &s == s.self, file t.cpp, line 10
> ABORT instruction (core dumped)

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