[Bug c/66903] New: The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[Bug c/66903] New: The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[speirofr at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66903

            Bug ID: 66903
           Summary: The gcc 4.9.2 crashes when processing declarations
                    such as: int (( ... (x) ... ))
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: speirofr at gmail dot com
  Target Milestone: ---

The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ...
)), with the number of parens > 4000000.

[Bug c/66903] The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[speirofr at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66903

--- Comment #1 from Salva Peiró <speirofr at gmail dot com> ---
Created attachment 36001
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36001&action=edit
parens.i: Preprocesed sourced with gcc -v -save-temps
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Subject: [Bug go/66904] New: cmd/go: "#cgo pkg-config:" comments do not work with gccgo
Date: Fri, 17 Jul 2015 08:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf904

            Bug ID: 66904
           Summary: cmd/go: "#cgo pkg-config:" comments do not work with
                    gccgo
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: doko at gcc dot gnu.org
                CC: cmang at google dot com
  Target Milestone: ---

see https://github.com/golang/go/issues/11739

[Bug c/66903] The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[speirofr at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66903

--- Comment #2 from Salva Peiró <speirofr at gmail dot com> ---

$ gcc parens.c 
gcc: internal compiler error: Segmentation fault (program cc1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions.
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-10'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --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 4.9.2 (Debian 4.9.2-10)
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Subject: [Bug c++/66901] Segmentation fault in compiler instead of error message for ill-formed program with namespace alias and qualified definition
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf901

Mikhail Maltsev <miyuki at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
                 CC|                            |miyuki at gcc dot gnu.org
      Known to fail|                            |6.0

--- Comment #1 from Mikhail Maltsev <miyuki at gcc dot gnu.org> ---
Reproduces on trunk. Possibly a dup of PR66878 (also caused by infinite
recursion in push_inner_scope_r).

[Bug c/66903] The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66903

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You are most likely overflowing the stack.  That is the stack is growing and
hitting the stack size.  The default stack size for Linux is 8MB, try using
"ulimit -s unlimited" before running gcc.

[Bug c/66903] The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[speirofr at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66903

--- Comment #4 from Salva Peiró <speirofr at gmail dot com> ---
Confirmed, the cause of the crash is the parser 
_cpp_lex_direct() consuming the default 8 MB Linux stack.

Indeed, ulimit -s shows the stack size limit is set to 8192 KB,
After recompiling with ulimit -s unlimited, the gcc compilation 
succeeds without crashes.

Thanks for the explanation & the time to look at this,
PS: I raised the issue mainly because I was unsure of causes that lead to the
crash.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc304

--- Comment #14 from David Abdurachmanov <david.abdurachmanov at gmail dot com> ---
I hit another two cases of this.

1. g2root tool, which converts GEANT geometry to ROOT geometry. It create a
single function, which contains lots of descriptions of material, shapes, etc.
all describing some 3D objects and physical properties. These can be very huge.

Also could think of MILL computing as possible example. They use C++ as they
assembler (at least for simulation). Thus you have something like:

void somefunc(void) {
  add(b0, b1);
  add(b2, b3);
  ...
}

IIRC, by compiling it they generate a simulator to run this program on specific
CPU.

2. mcfm 6.3 package, to be precise: mcfm-6.3/src/WW/triangle11new.f

triangle11new.s: Assembler messages:
triangle11new.s:587: Error: pc-relative load offset out of range
triangle11new.s:592: Error: pc-relative load offset out of range

..
   587         ldr     x0, .LC2
   588         fmov    d0, x2
   589         fmov    d1, x0
   590         fdiv    d0, d0, d1
   591         fmov    x2, d0
   592         ldr     x0, .LC2
..

346645 .LC2:
346646         .word   0
346647         .word   1073741824
346648         .align  3
..

Distance between ldr instruction and .LC2 is 346058 assembly lines.

Here is the source file:
https://github.com/cms-externals/MCFM/blob/master/src/WW/triangle11new.f (just
1355 sloc).

It's those huge computations, which are killing it. Similar issue as in
OpenLoops package.

[Bug c/66903] The gcc 4.9.2 crashes when processing declarations such as: int (( ... (x) ... ))

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66903

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |mpolacek at gcc dot gnu.org
         Resolution|---                         |WORKSFORME

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think there's nothing to do for this PR.