[Bug lto/45949] New: ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538) with -flto/-fwhopr on invalid code

[Bug lto/45949] New: ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538) with -flto/-fwhopr on invalid code

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45949

           Summary: ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538)
                    with -flto/-fwhopr on invalid code
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22004
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22004
reduced testcase (from g++.dg/template/cond2.C)

Command line:
$ gcc -O2 -flto pr45949.C
or
$ gcc -O2 -fwhopr pr45949.C

Related valgrind output:
pr45949.C: In instantiation of 'int test(c<(0 ?  : X)>*) [with int X = 2]':
pr45949.C:2:24:   instantiated from here
pr45949.C:2:24: error: omitted middle operand to '?:' operand cannot be mangled
==22144== Invalid read of size 8
==22144==    at 0xA1125D: gimple_default_def (tree-dfa.c:538)
==22144==    by 0xC132FB: ipa_analyze_node (ipa-prop.c:1282)
==22144==    by 0xC05E2A: ipcp_generate_summary (ipa-cp.c:1538)
==22144==    by 0x8FC6B5: execute_ipa_summary_passes (passes.c:1423)
==22144==    by 0xC048C7: cgraph_optimize (cgraphunit.c:1718)
==22144==    by 0xC04AA9: cgraph_finalize_compilation_unit (cgraphunit.c:1020)
==22144==    by 0x58736C: cp_write_global_declarations (decl2.c:3928)
==22144==    by 0x9E74E3: toplev_main (toplev.c:946)
==22144==    by 0x657BBBC: (below main) (in /lib64/libc-2.11.2.so)
==22144==  Address 0x40 is not stack'd, malloc'd or (recently) free'd
==22144== 
pr45949.C:7:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[Bug lto/45949] ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538) with -flto/-fwhopr on invalid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45949

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.10.09 12:24:32
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-09 12:24:32 UTC ---
The problem is we're issueing an error from decl_assembler_name called
via free_lang_data which is an IPA pass, so the guard

1768      if (!seen_error ())
1769        ipa_passes ();

in cgraph_optimize () doesn't work reliably.

Now, without LTO we're assigning the assembler name and erroring during
expansion.

[Bug lto/45949] ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538) with -flto/-fwhopr on invalid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45949

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-29 16:27:29 UTC ---
Mine.

[Bug lto/45949] ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538) with -flto/-fwhopr on invalid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45949

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-30 10:00:13 UTC ---
Author: rguenth
Date: Tue Nov 30 10:00:06 2010
New Revision: 167291

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167291
Log:
2010-11-30  Richard Guenther  <rguenther@suse.de>

    PR lto/45949
    * cgraphunit.c (ipa_passes): Stop after errors from
    small IPA passes.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cgraphunit.c

[Bug lto/45949] ICE: SIGSEGV in gimple_default_def (tree-dfa.c:538) with -flto/-fwhopr on invalid code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45949

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-30 12:07:57 UTC ---
Fixed.