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From: "David Binderman" <d.binderman@virgin.net> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: c/8268: no compile time array index checking Date: Sun, 26 Jan 2003 16:06:00 -0000 [thread overview] Message-ID: <20030126160600.15918.qmail@sources.redhat.com> (raw) The following reply was made to PR c/8268; it has been noted by GNATS. From: "David Binderman" <d.binderman@virgin.net> To: <bangerth@dealii.org>, <gcc-prs@gcc.gnu.org>, <nobody@gcc.gnu.org>, <gcc-gnats@gcc.gnu.org>, <gcc-bugs@gcc.gnu.org> Cc: Subject: Re: c/8268: no compile time array index checking Date: Sun, 26 Jan 2003 16:08:53 -0000 Hello there, I tried out the suggested patch, and it seems ok, until I run the gcc test suite, where I get problems on test gcc.c-torture/execute/20010924-1.c as shown (gdb) r /tmp/1.i Starting program: /home/dcb/gnu/gcc321/results.check/lib/gcc-lib/i686-pc-linux-gnu/3.2.1/cc1 /tmp/1.i main Program received signal SIGSEGV, Segmentation fault. 0x080f12d3 in get_inner_reference (exp=0x40271700, pbitsize=0xbffff1ec, pbitpos=0xbffff1f0, poffset=0xbffff1f4, pmode=0x0, punsignedp=0x40016c60, pvolatilep=0xbffff1fc) at ../../src/gcc-3.2.1/gcc/expr.c:5338 5338 || (TREE_CODE (TYPE_MAX_VALUE (domain)) == INTEGER_CST(gdb) list 5333 5334 if (domain && TREE_CODE (index) == INTEGER_CST) 5335 { 5336 if ((TREE_CODE (low_bound) == INTEGER_CST 5337 && tree_int_cst_lt(index, low_bound)) 5338 || (TREE_CODE (TYPE_MAX_VALUE (domain)) == INTEGER_CST5339 && tree_int_cst_lt (TYPE_MAX_VALUE (domain), index) 5340 /* Accesses after the end of arrays of size 0 (gcc5341 extension) and 1 are likely intentional. */ 5342 && !tree_int_cst_lt (TYPE_MAX_VALUE (domain), (gdb) Further, it seems a good idea if the warning message produced could be enhanced to give a clue about the index value and the size of the array. Something like warning: array index '10' in array 'fred' of size '5' is not valid. A possible second enhancement is to make sure that all six bugs in my original demonstration case are found. The current version of the patch only finds four of the six problems. The supplied patch does seem to find bugs in the gcc321 source code, however. Regards dcb ----- Original Message ----- From: <bangerth@dealii.org> To: <d.binderman@virgin.net>; <gcc-bugs@gcc.gnu.org>; <gcc-prs@gcc.gnu.org>; <nobody@gcc.gnu.org> Sent: Wednesday, January 08, 2003 2:40 AM Subject: Re: c/8268: no compile time array index checking > Synopsis: no compile time array index checking > > State-Changed-From-To: open->analyzed > State-Changed-By: bangerth > State-Changed-When: Tue Jan 7 18:40:02 2003 > State-Changed-Why: > Valid request. Falk even has a patch for that, but it > does not seem to be in. > > In fact, the category should not be accepts-illegal, since > the code is perfectly legal. It just does something > undefined. > > W. > > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p r=8268 >
next reply other threads:[~2003-01-26 16:06 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-01-26 16:06 David Binderman [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-01-28 0:46 Wolfgang Bangerth 2003-01-08 2:40 bangerth 2002-10-18 10:26 Falk Hueffner 2002-10-17 14:26 d.binderman
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