[Bug c++/55542] New: g++ segmentation fault

[Bug c++/55542] New: g++ segmentation fault

[hpsMouse at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

             Bug #: 55542
           Summary: g++ segmentation fault
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hpsMouse@gmail.com


Created attachment 28833
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28833
Preprocessed code to reproduce the bug (gzipped)

The fault happened when instantiation a template member function.

If the template definition is moved before its use point, this bug doesn't
occur.

Preprocessed code is attached.

Command line and output:

$ LC_ALL=C g++ -v -std=gnu++11 -xc++ -c code.out
Using built-in specs.
COLLECT_GCC=g++
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.2-4'
--with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Debian 4.7.2-4) 
COLLECT_GCC_OPTIONS='-v' '-std=gnu++11' '-c' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1plus -quiet -v -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE code.out -quiet -dumpbase code.out
-mtune=generic -march=x86-64 -auxbase code -std=gnu++11 -version -o
/tmp/ccbhLils.s
GNU C++ (Debian 4.7.2-4) version 4.7.2 (x86_64-linux-gnu)
    compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version 3.1.0-p10,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.7
 /usr/include/c++/4.7/x86_64-linux-gnu
 /usr/include/c++/4.7/backward
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
GNU C++ (Debian 4.7.2-4) version 4.7.2 (x86_64-linux-gnu)
    compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version 3.1.0-p10,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 34bdacb89b7ae9c3d7f292b0c3935a9a
binary_writer.cpp: In instantiation of 'void cbsocket::BinaryWriter::nop(Args
...) [with Args = {const cbsocket::WeakBuffer&, cbsocket::FixedBuffer*}]':
binary_writer.cpp:20:43:   required from here
binary_writer.cpp:105:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.7/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccWhkhq5.out file, please attach this to
your bugreport.

[Bug c++/55542] g++ segmentation fault

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-11-30
                 CC|                            |jakub at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-30 08:36:24 UTC ---
Reduced testcase:
template <typename ... P>
struct B
{
  template <typename O>
  B (O *o, void (O::*f) (P ... p)) {}
};
class C
{
  void foo (void *, int);
  template <typename ... A>
  void bar (A ... a);
  B <void *> c;
  B <void *, int> d;
  C (int) : c (this, &C::bar), d (this, &C::foo) {}
};
template <typename ... A>
void C::bar (A ...)
{
}

[Bug c++/55542] g++ segmentation fault

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org
   Target Milestone|---                         |4.6.4

[Bug c++/55542] g++ segmentation fault

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-30 08:41:45 UTC ---
Created attachment 28834
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28834
gcc48-pr55542.patch

I'd say that because the parameter pack is unnamed, it is fine to keep the
individual parameters in it unnamed too, and the other
make_ith_pack_parameter_name invocation was already guarding it.
Instead of handling NULL in the caller in the other spot, I think it is cleaner
just to return NULL from make_ith_pack_parameter_name.

[Bug c++/55542] g++ segmentation fault

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal

[Bug c++/55542] g++ segmentation fault

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2012-11-30 14:19:40 UTC ---
The patch is OK.

[Bug c++/55542] g++ segmentation fault

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-30 23:51:31 UTC ---
Author: jakub
Date: Fri Nov 30 23:51:26 2012
New Revision: 194010

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=194010
Log:
    PR c++/55542
    * pt.c (make_ith_pack_parameter_name): Return NULL if
    name is NULL.
    (tsubst_decl): Call make_ith_pack_parameter_name even if
    DECL_NAME is NULL.

    * g++.dg/cpp0x/vt-55542.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/vt-55542.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/pt.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/55542] g++ segmentation fault

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-01 14:03:49 UTC ---
Author: jakub
Date: Fri Feb  1 14:03:44 2013
New Revision: 195652

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195652
Log:
    Backported from mainline
    2012-12-01  Jakub Jelinek  <jakub@redhat.com>

    PR c++/55542
    * pt.c (make_ith_pack_parameter_name): Return NULL if
    name is NULL.
    (tsubst_decl): Call make_ith_pack_parameter_name even if
    DECL_NAME is NULL.

    * g++.dg/cpp0x/vt-55542.C: New test.

Added:
    branches/gcc-4_7-branch/gcc/testsuite/g++.dg/cpp0x/vt-55542.C
Modified:
    branches/gcc-4_7-branch/gcc/cp/ChangeLog
    branches/gcc-4_7-branch/gcc/cp/pt.c
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog

[Bug c++/55542] g++ segmentation fault

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55542

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-01 14:26:58 UTC ---
Fixed for 4.7.3+.