[Bug c++/102261] New: [12 Regression] ICE: Segmentation fault (in build_this_conversion)

[Bug c++/102261] New: [12 Regression] ICE: Segmentation fault (in build_this_conversion)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102261

            Bug ID: 102261
           Summary: [12 Regression] ICE: Segmentation fault (in
                    build_this_conversion)
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: x86_64-unknown-linux-gnu

g++-12.0.0-alpha20210905 snapshot (g:a827909537cf085e5673ca7816b7bd7151d89fc5)
ICEs when compiling the following testcase, extracted from
gcc/testsuite/gcc.target/i386/pr80173.c:

typedef int V __attribute__ ((vector_size (2 * sizeof (int))));

struct U { V a; V b; };

int
bar (int i)
{
  register struct U u asm ("xmm7");
  u = (struct U) {{-1, 0}, {-1, 0}};
  return u.b[i];
}

% x86_64-unknown-linux-gnu-g++-12.0.0 -c lfxfq1vi.cc
lfxfq1vi.cc: In function 'int bar(int)':
lfxfq1vi.cc:9:35: error: address of explicit register variable 'u' requested
    9 |   u = (struct U) {{-1, 0}, {-1, 0}};
      |                                   ^
lfxfq1vi.cc:9:35: internal compiler error: Segmentation fault
0x1143d7f crash_signal
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/toplev.c:328
0x915231 build_this_conversion
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:2291
0x915e53 add_function_candidate
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:2464
0x917186 add_candidates
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:6207
0x92648f add_candidates
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:6076
0x92648f add_operator_candidates
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:6361
0x92677e build_new_op_1
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:6569
0x9275dd build_new_op(op_location_t const&, tree_code, int, tree_node*,
tree_node*, tree_node*, tree_node**, int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/call.c:6957
0xb8ceff cp_build_modify_expr(unsigned int, tree_node*, tree_code, tree_node*,
int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/typeck.c:8936
0xb8d92c build_x_modify_expr(unsigned int, tree_node*, tree_code, tree_node*,
int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/typeck.c:9201
0xa8595a cp_parser_assignment_expression
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:10242
0xa870f2 cp_parser_expression
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:10371
0xa8a918 cp_parser_expression_statement
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:12564
0xa96d0a cp_parser_statement
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:12360
0xa97dcd cp_parser_statement_seq_opt
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:12712
0xa97ea8 cp_parser_compound_statement
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:12661
0xab86c0 cp_parser_function_body
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:24854
0xab86c0 cp_parser_ctor_initializer_opt_and_function_body
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:24905
0xab944a cp_parser_function_definition_after_declarator
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:31016
0xaba78b cp_parser_function_definition_from_specifiers_and_declarator
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210905/work/gcc-12-20210905/gcc/cp/parser.c:30932

[Bug c++/102261] [12 Regression] ICE: Segmentation fault (in build_this_conversion)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102261

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-09-10
     Ever confirmed|0                           |1
   Target Milestone|---                         |12.0
      Known to work|                            |11.2.1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

2289      conversion *t = implicit_conversion (parmtype, argtype, arg,
2290                                           /*c_cast_p=*/false, flags,
complain);
2291      t->this_p = this_p;
2292      return t;
2293    }
2294
2295    /* Create an overload candidate for the function or method FN called
(gdb) p t
$1 = (conversion *) 0x0

note I'm not sure the particular error is very helpful.  Why do we even
support asm("...") on aggregate types?

[Bug c++/102261] [12 Regression] ICE: Segmentation fault (in build_this_conversion) since r12-3346-g47543e5f9d1fc502

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102261

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[12 Regression] ICE:        |[12 Regression] ICE:
                   |Segmentation fault (in      |Segmentation fault (in
                   |build_this_conversion)      |build_this_conversion)
                   |                            |since
                   |                            |r12-3346-g47543e5f9d1fc502
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |ppalka at gcc dot gnu.org

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r12-3346-g47543e5f9d1fc502, it was rejected before the revision.

[Bug c++/102261] [12 Regression] ICE: Segmentation fault (in build_this_conversion) since r12-3346-g47543e5f9d1fc502

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102261

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4

[Bug c++/102261] [12/13 Regression] ICE: Segmentation fault (in build_this_conversion) since r12-3346-g47543e5f9d1fc502

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102261

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|12.0                        |12.2

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 12.1 is being released, retargeting bugs to GCC 12.2.

[Bug c++/102261] [12/13/14 Regression] ICE: Segmentation fault (in build_this_conversion) since r12-3346-g47543e5f9d1fc502

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102261

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|12.3                        |12.4

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 12.3 is being released, retargeting bugs to GCC 12.4.