[Bug middle-end/64246] New: [5 Regression] ICE building libada for Windows due to NULL loop header

[Bug middle-end/64246] New: [5 Regression] ICE building libada for Windows due to NULL loop header

[matt at gwalski dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

            Bug ID: 64246
           Summary: [5 Regression] ICE building libada for Windows due to
                    NULL loop header
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: matt at gwalski dot com
                CC: rguenther at suse dot de
              Host: x86_64-linux-gnu
            Target: i686-w64-mingw32
             Build: x86_64-linux-gnu

Attempting to build trunk SVN version 218496 supporting C,C++, and Ada fails
with the following:

/home/matt/buildgcc/./gcc/xgcc -B/home/matt/buildgcc/./gcc/
-L/usr/local/i686-w64-mingw32/lib -L/usr/local/mingw/lib -isystem
/usr/local/i686-w64-mingw32/include -isystem /usr/local/mingw/include
-B/usr/local/i686-w64-mingw32/bin/ -B/usr/local/i686-w64-mingw32/lib/ -isystem
/usr/local/i686-w64-mingw32/include -isystem
/usr/local/i686-w64-mingw32/sys-include    -c -g -O2   -W -Wall -gnatpg
-nostdinc   g-awk.adb -o g-awk.o
+===========================GNAT BUG DETECTED==============================+
| 5.0.0 20141208 (experimental) (i686-w64-mingw32) GCC error:              |
| in fix_loop_structure, at loop-init.c:263                                |
| Error detected around g-awk.adb:727:8                                    |
| Please submit a bug report; see http://gcc.gnu.org/bugs.html.            |
| Use a subject line meaningful to you and us to track the bug.            |
| Include the entire contents of this bug box in the report.               |
| Include the exact command that you entered.                              |
| Also include sources listed below.                                       |
+==========================================================================+

Please include these source files with error report
Note that list may not be accurate in some cases,
so please double check that the problem can still
be reproduced with the set of files listed.
Consider also -gnatd.n switch (see debug.adb).

system.ads
g-awk.adb
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raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:423
make[4]: *** [g-awk.o] Error 1

It's hitting an assert added in r214957/r215012.

I've been able to bootstrap a x86_64-linux-gnu Ada compiler fine with a
revision that fails for i686-w64-mingw32.

I believe I'm also seeing the error building a native i686-w64-mingw32
(bootstrap or no bootstrap) Ada compiler.

Configuration options:
configure --build=x86_64-linux-gnu --enable-shared --enable-static
--disable-multilib --enable-threads=posix --enable-fully-dynamic-string
--enable-sjlj-exceptions --enable-libgomp --enable-languages=c,c++,ada,lto
--target=i686-w64-mingw32 --host=x86_64-linux-gnu

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #1 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 10 Dec 2014, matt at gwalski dot com wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246
> 
>             Bug ID: 64246
>            Summary: [5 Regression] ICE building libada for Windows due to
>                     NULL loop header
>            Product: gcc
>            Version: 5.0
>             Status: UNCONFIRMED
>           Severity: major
>           Priority: P3
>          Component: middle-end
>           Assignee: unassigned at gcc dot gnu.org
>           Reporter: matt at gwalski dot com
>                 CC: rguenther at suse dot de
>               Host: x86_64-linux-gnu
>             Target: i686-w64-mingw32
>              Build: x86_64-linux-gnu
> 
> Attempting to build trunk SVN version 218496 supporting C,C++, and Ada fails
> with the following:
> 
> /home/matt/buildgcc/./gcc/xgcc -B/home/matt/buildgcc/./gcc/
> -L/usr/local/i686-w64-mingw32/lib -L/usr/local/mingw/lib -isystem
> /usr/local/i686-w64-mingw32/include -isystem /usr/local/mingw/include
> -B/usr/local/i686-w64-mingw32/bin/ -B/usr/local/i686-w64-mingw32/lib/ -isystem
> /usr/local/i686-w64-mingw32/include -isystem
> /usr/local/i686-w64-mingw32/sys-include    -c -g -O2   -W -Wall -gnatpg
> -nostdinc   g-awk.adb -o g-awk.o
> +===========================GNAT BUG DETECTED==============================+
> | 5.0.0 20141208 (experimental) (i686-w64-mingw32) GCC error:              |
> | in fix_loop_structure, at loop-init.c:263                                |
> | Error detected around g-awk.adb:727:8                                    |
> | Please submit a bug report; see http://gcc.gnu.org/bugs.html.            |
> | Use a subject line meaningful to you and us to track the bug.            |
> | Include the entire contents of this bug box in the report.               |
> | Include the exact command that you entered.                              |
> | Also include sources listed below.                                       |
> +==========================================================================+
> 
> Please include these source files with error report
> Note that list may not be accurate in some cases,
> so please double check that the problem can still
> be reproduced with the set of files listed.
> Consider also -gnatd.n switch (see debug.adb).
> 
> system.ads
> g-awk.adb
> g-awk.ads
> gnat.ads
> ada.ads
> a-finali.ads
> s-finroo.ads
> g-regpat.ads
> s-regpat.ads
> a-except.ads
> s-parame.ads
> s-stalib.ads
> a-unccon.ads
> s-traent.ads
> a-textio.ads
> a-ioexce.ads
> a-stream.ads
> s-ficobl.ads
> interfac.ads
> i-cstrea.ads
> s-crtl.ads
> s-wchcon.ads
> a-string.ads
> a-strunb.ads
> a-strmap.ads
> a-charac.ads
> a-chlat1.ads
> s-atocou.ads
> a-strfix.ads
> a-uncdea.ads
> g-dirope.ads
> g-dyntab.ads
> g-os_lib.ads
> s-os_lib.ads
> s-string.ads
> s-exctab.ads
> a-tags.ads
> s-stoele.ads
> s-soflin.ads
> s-stache.ads
> s-finmas.ads
> s-stopoo.ads
> s-pooglo.ads
> s-unstyp.ads
> s-stratt.ads
> s-secsta.ads
> s-stposu.ads
> s-ststop.ads
> s-imgint.ads
> s-valint.ads
> s-valrea.ads
> g-dyntab.adb
> g-hesorg.ads
> s-memory.ads
> g-hesorg.adb
> s-stoele.adb
> 
> 
> raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:423
> make[4]: *** [g-awk.o] Error 1
> 
> It's hitting an assert added in r214957/r215012.
> 
> I've been able to bootstrap a x86_64-linux-gnu Ada compiler fine with a
> revision that fails for i686-w64-mingw32.
> 
> I believe I'm also seeing the error building a native i686-w64-mingw32
> (bootstrap or no bootstrap) Ada compiler.
> 
> Configuration options:
> configure --build=x86_64-linux-gnu --enable-shared --enable-static
> --disable-multilib --enable-threads=posix --enable-fully-dynamic-string
> --enable-sjlj-exceptions --enable-libgomp --enable-languages=c,c++,ada,lto
> --target=i686-w64-mingw32 --host=x86_64-linux-gnu

Ok, trying to compile a cross compiler to reproduce the above seems
to require target headers which I dont' have.  I've built the
ada compiler itself so can you please attach the files referenced above?

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2014-12-10
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
   Target Milestone|---                         |5.0
     Ever confirmed|0                           |1

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |ASSIGNED
           Assignee|rguenth at gcc dot gnu.org         |ebotcazou at gcc dot gnu.org

--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Let me have a look first.

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Created attachment 34269
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34269&action=edit
Concatenated testcase

To be gnatchop-ed and compile at -O.

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
This happens only on i686-mingw32 because this requires SJLJ exceptions.  The
loop at stake is marked for removal during EH generation:

#0  mark_loop_for_removal (loop=0x7ffff6969ca8)
    at /home/eric/svn/gcc/gcc/cfgloop.c:1933
#1  0x0000000000da97e2 in sjlj_emit_dispatch_table (
    dispatch_label=0x7ffff6a4cec0, num_dispatch=6)
    at /home/eric/svn/gcc/gcc/except.c:1394
#2  0x0000000000da9bbe in sjlj_build_landing_pads ()
    at /home/eric/svn/gcc/gcc/except.c:1463
#3  0x0000000000da9d2d in finish_eh_generation ()
    at /home/eric/svn/gcc/gcc/except.c:1497
#4  0x0000000000c7bd4c in (anonymous namespace)::pass_expand::execute (
    this=0x39e6e60, fun=0x7ffff6924a80)
    at /home/eric/svn/gcc/gcc/cfgexpand.c:6005

        /* ???  For multiple dispatches we will end up with edges
           from the loop tree root into this loop, making it a
           multiple-entry loop.  Discard all affected loops.  */
        if (num_dispatch > 1)
          {
        for (loop = bb->loop_father;
             loop_outer (loop); loop = loop_outer (loop))
          mark_loop_for_removal (loop);
          }

but it is marked *twice* so loop->former_header is cleared the second time:

void
mark_loop_for_removal (loop_p loop)
{
  loop->former_header = loop->header;
  loop->header = NULL;
  loop->latch = NULL;
  loops_state_set (LOOPS_NEED_FIXUP);
}

The ICE occurs immediately after:

#0  internal_error (gmsgid=0x2ea5d27 "in %s, at %s:%d")
    at /home/eric/svn/gcc/gcc/diagnostic.c:1219
#1  0x00000000028a1772 in fancy_abort (
    file=0x2a09ca0 "/home/eric/svn/gcc/gcc/loop-init.c", line=263, 
    function=0x2a0a100 <fix_loop_structure(bitmap_head*)::__FUNCTION__>
"fix_loop_structure") at /home/eric/svn/gcc/gcc/diagnostic.c:1275
#2  0x000000000102a1cd in fix_loop_structure (changed_bbs=0x0)
    at /home/eric/svn/gcc/gcc/loop-init.c:263
#3  0x00000000026b48d9 in cleanup_cfg (mode=16)
    at /home/eric/svn/gcc/gcc/cfgcleanup.c:3083

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
We should make mark_loop_for_removal more robust then, I am testing

Index: gcc/cfgloop.c
===================================================================
--- gcc/cfgloop.c       (revision 218733)
+++ gcc/cfgloop.c       (working copy)
@@ -1928,9 +1928,10 @@ bb_loop_depth (const_basic_block bb)
 void
 mark_loop_for_removal (loop_p loop)
 {
+  if (loop->header == NULL)
+    return;
   loop->former_header = loop->header;
   loop->header = NULL;
   loop->latch = NULL;
   loops_state_set (LOOPS_NEED_FIXUP);
 }

I suppose extracting a testcase for this is too hard?

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I suppose extracting a testcase for this is too hard?

Do you mean a testcase like the one I attached on Friday?

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 15 Dec 2014, ebotcazou at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246
> 
> --- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> > I suppose extracting a testcase for this is too hard?
> 
> Do you mean a testcase like the one I attached on Friday?

Yes, but in suitable form for gnat.dg (not sure how I can do
multi-file testcases there or which one would be the main one)

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Yes, but in suitable form for gnat.dg (not sure how I can do
> multi-file testcases there or which one would be the main one)

Most testcases are multi-file under gnat.dg...  I'm going to attach it.

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #9 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Created attachment 34282
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34282&action=edit
Concatenated testcase for gnat.dg

To be gnatchop'ed and installed into the gnat.dg testsuite:

        * gnat.dg/opt46.ad[sb]: New testcase.
        * gnat.dg/opt46_pkg.ad[sb]: New helper.

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

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

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

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Eric Botcazou from comment #9)
> Created attachment 34282 [details]
> Concatenated testcase for gnat.dg
> 
> To be gnatchop'ed and installed into the gnat.dg testsuite:
> 
>         * gnat.dg/opt46.ad[sb]: New testcase.
>         * gnat.dg/opt46_pkg.ad[sb]: New helper.

Thanks - fixed.

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Dec 15 12:20:10 2014
New Revision: 218746

URL: https://gcc.gnu.org/viewcvs?rev=218746&root=gcc&view=rev
Log:
2014-12-15  Richard Biener  <rguenther@suse.de>

    PR middle-end/64246
    * cfgloop.c (mark_loop_for_removal): Make safe against multiple
    invocations on the same loop.

    * gnat.dg/opt46.adb: New testcase.
    * gnat.dg/opt46.ads: Likewise.
    * gnat.dg/opt46_pkg.adb: Likewise.
    * gnat.dg/opt46_pkg.ads: Likewise.

Added:
    trunk/gcc/testsuite/gnat.dg/opt46.adb
    trunk/gcc/testsuite/gnat.dg/opt46.ads
    trunk/gcc/testsuite/gnat.dg/opt46_pkg.adb
    trunk/gcc/testsuite/gnat.dg/opt46_pkg.ads
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfgloop.c
    trunk/gcc/testsuite/ChangeLog

[Bug middle-end/64246] [5 Regression] ICE building libada for Windows due to NULL loop header

[yroux at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64246

--- Comment #12 from Yvan Roux <yroux at gcc dot gnu.org> ---
Author: yroux
Date: Thu Mar  5 14:28:05 2015
New Revision: 221216

URL: https://gcc.gnu.org/viewcvs?rev=221216&root=gcc&view=rev
Log:
gcc/
2015-03-05  Yvan Roux  <yvan.roux@linaro.org>

    Backport from trunk r212011, r214942, r214957, r215012, r215016, r218115,
    r218733, r218746, r220491.
    2015-02-06  Sebastian Pop  <s.pop@samsung.com>
            Brian Rzycki  <b.rzycki@samsung.com>

    PR tree-optimization/64878
    * tree-ssa-threadedge.c: Include tree-ssa-loop.h.
    (fsm_find_control_statement_thread_paths): Add parameter seen_loop_phi.
    Stop recursion at loop phi nodes after having visited a loop phi node.

    2014-12-15  Richard Biener  <rguenther@suse.de>

    PR middle-end/64246
    * cfgloop.c (mark_loop_for_removal): Make safe against multiple
    invocations on the same loop.

    2014-12-15  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/64284
    * tree-ssa-threadupdate.c (duplicate_seme_region): Mark
    the loop for removal if we copied the loop header.

    2014-11-27  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/64083
    * tree-ssa-threadupdate.c (thread_through_all_blocks): Do not
    forcibly mark loop for removal the wrong way.

    2014-09-08  Richard Biener  <rguenther@suse.de>

    PR ipa/63196
    * tree-inline.c (copy_loops): The source loop header should
    always be non-NULL.
    (tree_function_versioning): If loops need fixup after removing
    unreachable blocks fix them.
    * omp-low.c (simd_clone_adjust): Do not add incr block to
    loop under construction.

    2014-09-08  Richard Biener  <rguenther@suse.de>

    PR bootstrap/63204
    * cfgloop.c (mark_loop_for_removal): Track former header
    unconditionally.
    * cfgloop.h (struct loop): Add former_header member unconditionally.
    * loop-init.c (fix_loop_structure): Enable bogus loop removal
    diagnostic unconditionally.

    2014-09-05  Richard Biener  <rguenther@suse.de>

    * cfgloop.c (mark_loop_for_removal): Record former header
    when ENABLE_CHECKING.
    * cfgloop.h (strut loop): Add former_header member when
    ENABLE_CHECKING.
    * loop-init.c (fix_loop_structure): Sanity check loops
    marked for removal if they re-appeared.

    2014-09-05  Richard Biener  <rguenther@suse.de>

    * cfgloop.c (mark_loop_for_removal): New function.
    * cfgloop.h (mark_loop_for_removal): Declare.
    * cfghooks.c (delete_basic_block): Use mark_loop_for_removal.
    (merge_blocks): Likewise.
    (duplicate_block): Likewise.
    * except.c (sjlj_emit_dispatch_table): Likewise.
    * tree-eh.c (cleanup_empty_eh_merge_phis): Likewise.
    * tree-ssa-threadupdate.c (ssa_redirect_edges): Likewise.
    (thread_through_loop_header): Likewise.

    2014-06-26  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/61607
    * tree-ssa-threadupdate.c (ssa_redirect_edges): Cancel the
    loop if we redirected its latch edge.
    (thread_block_1): Do not cancel loops prematurely.

gcc/testsuite/
2015-03-05  Yvan Roux  <yvan.roux@linaro.org>

    Backport from trunk r218115, r218733, r218746, r220491.
    2015-02-06  Sebastian Pop  <s.pop@samsung.com>
            Brian Rzycki  <b.rzycki@samsung.com>

    PR tree-optimization/64878
    * testsuite/gcc.dg/tree-ssa/ssa-dom-thread-8.c: New.

    2014-12-15  Richard Biener  <rguenther@suse.de>

    PR middle-end/64246
    * gnat.dg/opt46.adb: New testcase.
    * gnat.dg/opt46.ads: Likewise.
    * gnat.dg/opt46_pkg.adb: Likewise.
    * gnat.dg/opt46_pkg.ads: Likewise.

    2014-12-15  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/64284
    * gcc.dg/torture/pr64284.c: New testcase.

    2014-11-27  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/64083
    * gcc.dg/torture/pr64083.c: New testcase.


Added:
    branches/linaro/gcc-4_9-branch/gcc/testsuite/gcc.dg/torture/pr64083.c
    branches/linaro/gcc-4_9-branch/gcc/testsuite/gcc.dg/torture/pr64284.c
   
branches/linaro/gcc-4_9-branch/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-8.c
    branches/linaro/gcc-4_9-branch/gcc/testsuite/gnat.dg/opt46.adb
    branches/linaro/gcc-4_9-branch/gcc/testsuite/gnat.dg/opt46.ads
    branches/linaro/gcc-4_9-branch/gcc/testsuite/gnat.dg/opt46_pkg.adb
    branches/linaro/gcc-4_9-branch/gcc/testsuite/gnat.dg/opt46_pkg.ads
Modified:
    branches/linaro/gcc-4_9-branch/gcc/ChangeLog.linaro
    branches/linaro/gcc-4_9-branch/gcc/cfghooks.c
    branches/linaro/gcc-4_9-branch/gcc/cfgloop.c
    branches/linaro/gcc-4_9-branch/gcc/cfgloop.h
    branches/linaro/gcc-4_9-branch/gcc/except.c
    branches/linaro/gcc-4_9-branch/gcc/loop-init.c
    branches/linaro/gcc-4_9-branch/gcc/omp-low.c
    branches/linaro/gcc-4_9-branch/gcc/testsuite/ChangeLog.linaro
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