[Bug c++/96805] New: ICE: Segmentation fault in instantiate_template / pop_nested_class()

[Bug c++/96805] New: ICE: Segmentation fault in instantiate_template / pop_nested_class()

[marc.mutz at kdab dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

            Bug ID: 96805
           Summary: ICE: Segmentation fault in instantiate_template /
                    pop_nested_class()
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marc.mutz at kdab dot com
  Target Milestone: ---

Created attachment 49134
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49134&action=edit
BZ2-compressed preprocessed source

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96732 looks similar, but this is
on 10.2, not 11...

$ g++ -E -pipe -O2 -fPIC -std=c++2a -fvisibility=hidden
-fvisibility-inlines-hidden -ffunction-sections -fdata-sections -fno-exceptions
-Wall -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond
-Wno-stringop-overflow -Wno-format-overflow -Wsuggest-override -D_REENTRANT
-DQT_NO_JAVA_STYLE_ITERATORS -DPCRE2_DISABLE_JIT -DHAVE_CONFIG_H
-DQT_VERSION_STR='"6.0.0"' -DQT_VERSION_MAJOR=6 -DQT_VERSION_MINOR=0
-DQT_VERSION_PATCH=0 -DQT_BOOTSTRAPPED -DQT_NO_CAST_TO_ASCII
-DPCRE2_CODE_UNIT_WIDTH=16 -DQT_NO_FOREACH -DQT_NO_CAST_FROM_ASCII
-DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_BOOTSTRAP_LIB
-DQT_BUILDING_QT -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT
-DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS
-DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_DEPRECATED_WARNINGS_SINCE=0x060000
-DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG
-I/home/marc/Qt/qtbase/src/tools/bootstrap -I. -I/home/marc/Qt/qtbase/src/tools
-I/home/marc/Qt/qtbase/src/3rdparty/tinycbor/src
-I/home/marc/Qt/qtbase/src/3rdparty/pcre2/src -I../../../include
-I../../../include/QtCore -I../../../include/QtCore/6.0.0
-I../../../include/QtCore/6.0.0/QtCore -I../../../include/QtXml
-I../../../include/QtXml/6.0.0 -I../../../include/QtXml/6.0.0/QtXml
-I/home/marc/Qt/qtbase/mkspecs/linux-g++ -o qendian.ii
/home/marc/Qt/qtbase/src/corelib/global/qendian.cpp
../../../include/QtCore/../../../qtbase/src/corelib/tools/qarraydataops.h:102:77:
internal compiler error: Segmentation fault
  102 |             noexcept(std::is_nothrow_constructible_v<T,
iterator_copy_value<ForwardIt>>)
      |                                                                        
    ^~~~~~~~~
0xc2ee1f crash_signal
        ../../gcc/gcc/toplev.c:328
0x6280c5 pop_nested_class()
        ../../gcc/gcc/cp/class.c:8184
0x738747 instantiate_template_1
        ../../gcc/gcc/cp/pt.c:20853
0x733694 instantiate_template(tree_node*, tree_node*, int)
        ../../gcc/gcc/cp/pt.c:20908
0x733694 instantiate_alias_template
        ../../gcc/gcc/cp/pt.c:20946
0x733694 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:15147
0x739b0f lookup_template_class_1
        ../../gcc/gcc/cp/pt.c:9853
0x73a1ec lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
        ../../gcc/gcc/cp/pt.c:10119
0x756b3d finish_template_type(tree_node*, tree_node*, int)
        ../../gcc/gcc/cp/semantics.c:3408
0x6fe15d cp_parser_template_id
        ../../gcc/gcc/cp/parser.c:16739
0x6fe3cc cp_parser_class_name
        ../../gcc/gcc/cp/parser.c:23713
0x6fb101 cp_parser_qualifying_entity
        ../../gcc/gcc/cp/parser.c:6776
0x6fb101 cp_parser_nested_name_specifier_opt
        ../../gcc/gcc/cp/parser.c:6458
0x702706 cp_parser_simple_type_specifier
        ../../gcc/gcc/cp/parser.c:18134
0x6e93ed cp_parser_type_specifier
        ../../gcc/gcc/cp/parser.c:17792
0x6fc9a9 cp_parser_type_specifier_seq
        ../../gcc/gcc/cp/parser.c:22402
0x6f6f34 cp_parser_type_id_1
        ../../gcc/gcc/cp/parser.c:22219
0x6f9473 cp_parser_template_type_arg
        ../../gcc/gcc/cp/parser.c:22310
0x6fcb2f cp_parser_template_argument
        ../../gcc/gcc/cp/parser.c:17189
0x6fcb2f cp_parser_template_argument_list
        ../../gcc/gcc/cp/parser.c:17100
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

[Bug c++/96805] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[marc.mutz at kdab dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

--- Comment #1 from Marc Mutz <marc.mutz at kdab dot com> ---
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/d/gcc/10/libexec/gcc/x86_64-pc-linux-gnu/10.2.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/d/gcc/10
--enable-languages=c,c++,fortran,lto,objc --no-create --no-recursion :
(reconfigured) ../gcc/configure --prefix=/d/gcc/10
--enable-languages=c,c++,fortran,lto,objc --no-create --no-recursion
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.1 20200824 (GCC)

[Bug c++/96805] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[marc.mutz at kdab dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

--- Comment #2 from Marc Mutz <marc.mutz at kdab dot com> ---
also in gcc version 10.2.1 20200826 (GCC)

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|                            |2020-08-26
             Status|UNCONFIRMED                 |NEW
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |mpolacek at gcc dot gnu.org
   Target Milestone|---                         |10.3
     Ever confirmed|0                           |1
            Summary|ICE: Segmentation fault in  |[10/11 Regression] ICE:
                   |instantiate_template /      |Segmentation fault in
                   |pop_nested_class()          |instantiate_template /
                   |                            |pop_nested_class()

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.  Seems like this one started with r11-2747 instead.

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:

$ cat qendian.ii
template <typename> bool is_nothrow_constructible_v;
template <typename> struct QArrayExceptionSafetyPrimitives {
  struct {
    template <typename> using iterator_move_value = decltype(0);
    template <typename ForwardIt>
    void
    move()
noexcept(is_nothrow_constructible_v<iterator_move_value<ForwardIt>>);
  };
};

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gccbugbjorn at fahller dot se

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 96819 has been marked as a duplicate of this bug. ***

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com

--- Comment #6 from Patrick Palka <ppalka at gcc dot gnu.org> ---
*** Bug 96732 has been marked as a duplicate of this bug. ***

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gcc-bugs at marehr dot dialup.fu-b
                   |                            |erlin.de

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** Bug 96872 has been marked as a duplicate of this bug. ***

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |furkanusta17 at gmail dot com

--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** Bug 97293 has been marked as a duplicate of this bug. ***

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

--- Comment #9 from David Binderman <dcb314 at hotmail dot com> ---
I see no progress on this bug for over a month now.
I'd be happy to help with testing. 

Perhaps Jason is best placed to make progress on this bug.

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #10 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Here's a more condensed testcase (accepted with -std=c++11/14, ICEs with
-std=c++17/20):

template <typename> class a {
  template <int b> struct c {
    template <bool> using t = int;
    t<b> m;
  };
};

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

[Bug c++/96805] [10/11 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:1c56c143b2011080d8a4516f37f78f647b0ee258

commit r11-3738-g1c56c143b2011080d8a4516f37f78f647b0ee258
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Oct 8 15:43:26 2020 -0400

    c++: Fix member alias template in C++17 and up. [PR96805]

    Here we're trying to push into a<T>::c<N> in order to instantiate t<N>, but
    were building a TYPENAME_TYPE for it because a<T> isn't open yet.  Don't
    do that when we know we're trying to enter the scope.

    gcc/cp/ChangeLog:

            PR c++/96805
            PR c++/96199
            * pt.c (tsubst_aggr_type): Don't build a TYPENAME_TYPE when
            entering_scope.
            (tsubst_template_decl): Use tsubst_aggr_type.

    gcc/testsuite/ChangeLog:

            PR c++/96805
            * g++.dg/cpp0x/alias-decl-pr96805.C: New test.

[Bug c++/96805] [10 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[10/11 Regression] ICE:     |[10 Regression] ICE:
                   |Segmentation fault in       |Segmentation fault in
                   |instantiate_template /      |instantiate_template /
                   |pop_nested_class()          |pop_nested_class()
           Priority|P3                          |P2
      Known to work|                            |11.0
      Known to fail|                            |10.2.0

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk(?)

[Bug c++/96805] [10 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:e89ebd3e896f27d4afc400044d5a2b69cb524bcb

commit r10-9069-ge89ebd3e896f27d4afc400044d5a2b69cb524bcb
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Oct 8 15:43:26 2020 -0400

    c++: Fix member alias template in C++17 and up. [PR96805]

    Here we're trying to push into a<T>::c<N> in order to instantiate t<N>, but
    were building a TYPENAME_TYPE for it because a<T> isn't open yet.  Don't
    do that when we know we're trying to enter the scope.

    gcc/cp/ChangeLog:

            PR c++/96805
            PR c++/96199
            * pt.c (tsubst_aggr_type): Don't build a TYPENAME_TYPE when
            entering_scope.
            (tsubst_template_decl): Use tsubst_aggr_type.

    gcc/testsuite/ChangeLog:

            PR c++/96805
            * g++.dg/cpp0x/alias-decl-pr96805.C: New test.

[Bug c++/96805] [10 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Jason Merrill <jason at gcc dot gnu.org> changed:

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

--- Comment #14 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.

[Bug c++/96805] [10 Regression] ICE: Segmentation fault in instantiate_template / pop_nested_class()

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96805

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |delleyves at gmx dot ch

--- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 99550 has been marked as a duplicate of this bug. ***