c++/8906: G++ 3.2 raises segmentation fault when parsing nested-class definition

c++/8906: G++ 3.2 raises segmentation fault when parsing nested-class definition

[wirawan0]

>Number:         8906
>Category:       c++
>Synopsis:       G++ 3.2 raises segmentation fault when parsing nested-class definition
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 11 16:06:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Wirawan Purwanto
>Release:        g++ version 3.2
>Organization:
>Environment:
Linux (Redhat 7.3) or Windows 2000 (cygwin) or SunSPARC machine (running Solaris)
>Description:
Brief:   <Segmentation fault> happens in G++ version 3.2 when parsing the definition of a nested class definition, if the "outer" class is a templatized class.

This problem is also-reproducible in SunSPARC and Win32's version of GCC 3.2
>How-To-Repeat:
Please take a look at the attachment for more details. It contains a small piece of code to trigger the error. In brief, try to compile the following:

template <class _stuff>
class CLASS1
{
    class Nested1
    {
        class Nested2;
    };
};

template <class _stuff>
class CLASS1<_stuff>::Nested1::Nested2 // <--error here!!!
{
public:
    int x;
};

/* NOTE: it turns out that the same problem occurs if the outermost class is an ordinary class (not templatized) */
>Fix:
Don't know. Note that DEC CXX complains if I use the second kind of declaration (cf. the attachment, the part compiled with -DNOT_BUGGY=2).
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="gcc-3.2-bugs.nested-class-decl.txt"
Content-Disposition: inline; filename="gcc-3.2-bugs.nested-class-decl.txt"

#if 0

** BUG REPORT FOR GNU C++ VERSION 3.2 ************************************

Date: 11-Dec-2002
Subject: Bug in G++ version 3.2 in nested class definition
Contact: Please write to me <wirawan0@softhome.net> if you need more info;
         note that I am not subscribed to GCC mailing list.


Brief:   <Segmentation fault> happends in G++ version 3.2 when parsing
the definition of a nested class definition, if the "outer" class is a
templatized class

Compiler: GNU C++ version 3.2
OS: Red Hat Linux 7.3
Machine: a Sony VAIO PCG-FXA53 laptop
CPU: AMD Athlon XP 1500+

"/usr/local/bin/g++ -v" says:

  Reading specs from /usr/local/gcc-3.2/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs
  Configured with: /misc/src/gcc-3.2/configure --prefix=/usr/local/gcc-3.2 --disable-nls --enable-languages=c,c++,f77
  Thread model: posix
  gcc version 3.2

Description:

The problem can be reproduced using the code piece enclosed below. If you
put switch -DNOT_BUGGY=1 or -DNOT_BUGGY=2, it will compile OK. But if you
don not define NOT_BUGGY (or use -DNOT_BUGGY=0), it will give a
segmentation fault.

This problem is also-reproducible in SunSPARC and Win32! The same
segmentation fault also occurs in GNU C++ version 3.2 that is run in
SunSPARC. On the Sun machine, "uname -a" returns:

  SunOS <a-host-name> 5.7 Generic_106541-18 sun4u sparc SUNW,Ultra-60

and "g++ -v" returns an essentially identical output to the previous one
(i.e. --disable-nls --enable-language=c,c++,f77).

I am also able to produce the same error in CYGWIN distribution of
GNU C++ 3.2 (i.e. gcc version 3.2 20020818 (preprelease)).

I also tried GNU C++ version 2.96 (on the same Red Hat machine), released
by Red Hat, as a reference. The abovementioned error does NOT occur with
this compiler. Invoking "g++ -v" for this compiler returns:

  Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
  gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-113)


APPENDICES:

OUTPUT FROM COMMAND: /usr/local/bin/g++ -x c++ -v -DNOT_BUGGY=0 gcc-3.2-bugs.nested-class-decl.txt -S

  Reading specs from /usr/local/gcc-3.2/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs
  Configured with: /misc/src/gcc-3.2/configure --prefix=/usr/local/gcc-3.2 --disable-nls --enable-languages=c,c++,f77
  Thread model: posix
  gcc version 3.2
   /usr/local/gcc-3.2/lib/gcc-lib/i686-pc-linux-gnu/3.2/cc1plus -v -iprefix /usr/local/bin/../lib/gcc-lib/i686-pc-linux-gnu/3.2/ -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=0 -D__GXX_ABI_VERSION=102 -D__ELF__ -Dunix -D__gnu_linux__ -Dlinux -D__ELF__ -D__unix__ -D__gnu_linux__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ -DNOT_BUGGY=0 gcc-3.2-bugs.txt -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -quiet -dumpbase gcc-3.2-bugs.txt -version -o gcc-3.2-bugs.s
  GNU CPP version 3.2 (cpplib) (i386 Linux/ELF)
  GNU C++ version 3.2 (i686-pc-linux-gnu)
          compiled by GNU C version 3.2.
  ignoring nonexistent directory "/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/../../../../include/c++/3.2"
  ignoring nonexistent directory "/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/../../../../include/c++/3.2/i686-pc-linux-gnu"ignoring nonexistent directory "/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/../../../../include/c++/3.2/backward"
  ignoring nonexistent directory "/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/include"
  ignoring nonexistent directory "/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/../../../../i686-pc-linux-gnu/include"
  ignoring nonexistent directory "/usr/local/gcc-3.2/i686-pc-linux-gnu/include"
  #include "..." search starts here:
  #include <...> search starts here:
   /usr/local/gcc-3.2/include/c++/3.2
   /usr/local/gcc-3.2/include/c++/3.2/i686-pc-linux-gnu
   /usr/local/gcc-3.2/include/c++/3.2/backward
   /usr/local/include
   /usr/local/gcc-3.2/include
   /usr/local/gcc-3.2/lib/gcc-lib/i686-pc-linux-gnu/3.2/include
   /usr/include
  End of search list.
  gcc-3.2-bugs.nested-class-decl.txt:134: internal error: Segmentation fault
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.



#endif // end of the bug report. HERE IS THE CODE PIECE:

#if NOT_BUGGY == 1   // -------------- this compiles OK ------------------

template <class _stuff>
class CLASS1
{
    class Nested1
    {
        class Nested2
        {
        public:
            int x;
        };
    };
};

#elif NOT_BUGGY == 2 // -------------- this also compiles OK -------------

template <class _stuff>
class CLASS1
{
    class Nested1
    {
        class Nested2
        {
        public:
            int x;
        };
    };
};


#else // this is the BUGGY kind of declaration: --------------------------

template <class _stuff>
class CLASS1
{
    class Nested1
    {
        class Nested2;
    };
};

template <class _stuff>
class CLASS1<_stuff>::Nested1::Nested2 // !!! <-- the error happens here
{
public:
    int x;
};

#endif // below is just a stub, disregard it.

int main(int argc, char *argv[], char *env[])
{
    CLASS1<int>::Nested1::Nested2 x;
    return 0;
}