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* [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value @ 2004-11-04 18:34 zak at transversal dot com 2004-11-04 18:35 ` [Bug target/18300] " zak at transversal dot com ` (6 more replies) 0 siblings, 7 replies; 8+ messages in thread From: zak at transversal dot com @ 2004-11-04 18:34 UTC (permalink / raw) To: gcc-bugs On x86_64 (but not on i686) the following legal code sends gcc 3.2.3, 3.3.4 and current 3.3-branch CVS into an infinite loop. ///////////////////////////////////////// struct Base1 { }; struct Base2 { }; struct Base3 { }; struct Derived : Base1, Base2, Base3 { }; void foo(Derived); int main() { foo(Derived()); } ////////////////////////////////////////// The problem appears to be in classify_argument in gcc/config/i386.c: in both the RECORD_TYPE and UNION_TYPE branches, the same loop variable (i) is used in two nested loops. I'm not sure I fully understand this code, but it seems unlikely that this is the intention. I'm also not sure if it's possible for this to result in other failure modes besides the infinite loop, although it certainly seems possible. Using two distinct loop variables appears to fix the problem -- a patch will follow after I've done testsuite runs on current CVS. (Looking at the source, the above problem appears to still be present on the 3.4 branch and CVS HEAD, although I've not tested there yet.) -- Summary: Infinite loop when passing object with 3+ base classes by value Product: gcc Version: 3.3.4 Status: UNCONFIRMED Severity: normal Priority: P2 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: zak at transversal dot com CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: x86_64-pc-linux-gnu GCC host triplet: x86_64-pc-linux-gnu GCC target triplet: x86_64-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com @ 2004-11-04 18:35 ` zak at transversal dot com 2004-11-04 18:53 ` pinskia at gcc dot gnu dot org ` (5 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: zak at transversal dot com @ 2004-11-04 18:35 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |compile-time-hog Known to fail| |3.2.3 3.3.3 3.3.4 3.3.5 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com 2004-11-04 18:35 ` [Bug target/18300] " zak at transversal dot com @ 2004-11-04 18:53 ` pinskia at gcc dot gnu dot org 2004-11-04 18:54 ` pinskia at gcc dot gnu dot org ` (4 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-11-04 18:53 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-04 18:53 ------- *** Bug 14591 has been marked as a duplicate of this bug. *** -- What |Removed |Added ---------------------------------------------------------------------------- CC| |kong at ece dot ucdavis dot | |edu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com 2004-11-04 18:35 ` [Bug target/18300] " zak at transversal dot com 2004-11-04 18:53 ` pinskia at gcc dot gnu dot org @ 2004-11-04 18:54 ` pinskia at gcc dot gnu dot org 2004-11-10 12:36 ` zak at transversal dot com ` (3 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-11-04 18:54 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-04 18:54 ------- Confimred via PR 14591. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2004-11-04 18:54:36 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com ` (2 preceding siblings ...) 2004-11-04 18:54 ` pinskia at gcc dot gnu dot org @ 2004-11-10 12:36 ` zak at transversal dot com 2004-11-12 16:33 ` zak at transversal dot com ` (2 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: zak at transversal dot com @ 2004-11-10 12:36 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From zak at transversal dot com 2004-11-10 12:36 ------- I've submitted a patch which fixes this: http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00811.html -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |patch Known to fail|3.2.3 3.3.3 3.3.4 3.3.5 |3.2.3 3.3.3 3.3.4 3.3.5 | |3.4.2 4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com ` (3 preceding siblings ...) 2004-11-10 12:36 ` zak at transversal dot com @ 2004-11-12 16:33 ` zak at transversal dot com 2004-11-13 23:09 ` cvs-commit at gcc dot gnu dot org 2004-11-13 23:31 ` giovannibajo at libero dot it 6 siblings, 0 replies; 8+ messages in thread From: zak at transversal dot com @ 2004-11-12 16:33 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From zak at transversal dot com 2004-11-12 16:33 ------- Amended patch: http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00948.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com ` (4 preceding siblings ...) 2004-11-12 16:33 ` zak at transversal dot com @ 2004-11-13 23:09 ` cvs-commit at gcc dot gnu dot org 2004-11-13 23:31 ` giovannibajo at libero dot it 6 siblings, 0 replies; 8+ messages in thread From: cvs-commit at gcc dot gnu dot org @ 2004-11-13 23:09 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-11-13 23:09 ------- Subject: Bug 18300 CVSROOT: /cvs/gcc Module name: gcc Changes by: rth@gcc.gnu.org 2004-11-13 23:09:08 Modified files: gcc : ChangeLog gcc/config/i386: i386.c Added files: gcc/testsuite/g++.dg/other: infloop-1.C Log message: PR target/18300 * config/i386/i386.c (classify_argument): Fix infinite loop when passing object with 3 or more base classes by value. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6322&r2=2.6323 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386.c.diff?cvsroot=gcc&r1=1.736&r2=1.737 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/other/infloop-1.C.diff?cvsroot=gcc&r1=NONE&r2=1.1 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/18300] Infinite loop when passing object with 3+ base classes by value 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com ` (5 preceding siblings ...) 2004-11-13 23:09 ` cvs-commit at gcc dot gnu dot org @ 2004-11-13 23:31 ` giovannibajo at libero dot it 6 siblings, 0 replies; 8+ messages in thread From: giovannibajo at libero dot it @ 2004-11-13 23:31 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From giovannibajo at libero dot it 2004-11-13 23:31 ------- Fixed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED Target Milestone|--- |4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18300 ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2004-11-13 23:31 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-11-04 18:34 [Bug target/18300] New: Infinite loop when passing object with 3+ base classes by value zak at transversal dot com 2004-11-04 18:35 ` [Bug target/18300] " zak at transversal dot com 2004-11-04 18:53 ` pinskia at gcc dot gnu dot org 2004-11-04 18:54 ` pinskia at gcc dot gnu dot org 2004-11-10 12:36 ` zak at transversal dot com 2004-11-12 16:33 ` zak at transversal dot com 2004-11-13 23:09 ` cvs-commit at gcc dot gnu dot org 2004-11-13 23:31 ` giovannibajo at libero dot it
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