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From: "eidletni at mail dot ru" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/47444] New: False warning: array subscript is above array bounds Date: Mon, 24 Jan 2011 19:20:00 -0000 [thread overview] Message-ID: <bug-47444-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47444 Summary: False warning: array subscript is above array bounds Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: eidletni@mail.ru Created attachment 23104 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23104 c++ code $ g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/home/eid-letni/opt/gcc/libexec/gcc/i686-pc-linux-gnu/4.6.0/lto-wrapper Target: i686-pc-linux-gnu Configured with: ../configure --prefix=/home/eid-letni/opt/gcc --enable-languages=c,c++ : (reconfigured) ../configure --prefix=/home/eid-letni/opt/gcc --enable-languages=c,c++,lto --no-create --no-recursion Thread model: posix gcc version 4.6.0 20110124 (experimental) (GCC) $ uname -a Linux eidletni 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686 GNU/Linux $ g++ -O3 -Wall -c a.ii Warning in function "bool f2(unsigned)" : bool f1(); struct A { bool b1; bool b2; A(unsigned i); }; bool f2(unsigned i) { enum { SIZE = 2 }; if ( i>=SIZE && f1() ) throw 1; bool v[SIZE] = { 1, 1 }; return v[i]; } A::A(unsigned i): b1(f2(i)), b2(f2(i)) {} This warning is false, because constructor of struct A never called with "bad" parameters. Warning disappears if: *) remove f1() call in "if ( i>=SIZE && f1() )" *) make "return true" instead of "throw 1" *) inline struct A constructor, "inline A::A(unsigned i)" *) make size of array "bool v[]" equal 1, "enum { SIZE = 1 }"
next reply other threads:[~2011-01-24 18:38 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-01-24 19:20 eidletni at mail dot ru [this message] 2011-01-24 21:32 ` [Bug c++/47444] " pinskia at gcc dot gnu.org 2011-01-24 22:48 ` paolo.carlini at oracle dot com 2011-01-24 23:01 ` manu at gcc dot gnu.org 2011-01-25 11:09 ` rguenth at gcc dot gnu.org 2011-01-25 13:17 ` manu at gcc dot gnu.org 2011-01-25 13:20 ` redi at gcc dot gnu.org 2011-01-25 13:25 ` manu at gcc dot gnu.org 2011-01-25 19:10 ` eidletni at mail dot ru 2011-01-25 19:46 ` redi at gcc dot gnu.org 2011-01-25 19:53 ` eidletni at mail dot ru 2011-03-26 16:06 ` aj664 at hotmail dot com 2011-03-26 17:49 ` aj664 at hotmail dot com 2011-03-26 18:41 ` manu at gcc dot gnu.org 2012-10-31 19:25 ` eidletni at mail dot ru
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