[Bug c/102763] New: ICE on gimple code: segmentation fault, build_component_ref

[Bug c/102763] New: ICE on gimple code: segmentation fault, build_component_ref

[cnsun at uwaterloo dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102763

            Bug ID: 102763
           Summary: ICE on gimple code: segmentation fault,
                    build_component_ref
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cnsun at uwaterloo dot ca
  Target Milestone: ---

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/configure
--enable-languages=c,c++,lto --enable-checking-yes --enable-multiarch
--prefix=/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211014 (experimental) [master -gee9fa8a57] (GCC)

$ cat mutant.c
__GIMPLE
foo() { get_current()->flags; }

$ gcc-trunk -w -fgimple mutant.c
mutant.c: In function ‘foo’:
mutant.c:2:1: internal compiler error: Segmentation fault
    2 | foo() { get_current()->flags; }
      | ^~~
0xf8c8d3 crash_signal
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/toplev.c:326
0x967665 build_component_ref(unsigned int, tree_node*, tree_node*, unsigned
int)
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/c-typeck.c:2466
0x9c27bf c_parser_gimple_postfix_expression_after_primary
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:1838
0x9c27bf c_parser_gimple_postfix_expression
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:1716
0x9c3b13 c_parser_gimple_unary_expression
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:1203
0x9c44f1 c_parser_gimple_statement
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:710
0x9c5273 c_parser_gimple_compound_statement
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:650
0x9c5273 c_parser_gimple_compound_statement
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:381
0x9c6f47 c_parser_parse_gimple_body(c_parser*, char*, c_declspec_il,
profile_count)
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/gimple-parser.c:253
0x9b48c8 c_parser_declaration_or_fndef
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/c-parser.c:2539
0x9bd933 c_parser_external_declaration
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/c-parser.c:1780
0x9be39b c_parser_translation_unit
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/c-parser.c:1653
0x9be39b c_parse_file()
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c/c-parser.c:23222
0xa20db5 c_common_parse_file()
        /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/gcc/c-family/c-opts.c:1237
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/102763] ICE on gimple code: segmentation fault, build_component_ref

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102763

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-10-15
             Blocks|                            |101057
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I have a patch avoiding the crash.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101057
[Bug 101057] [gimplefe] GIMPLE frontend issues

[Bug c/102763] ICE on gimple code: segmentation fault, build_component_ref

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102763

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:17ffb7a562061c54eb6eb9863271524568761cf6

commit r12-4431-g17ffb7a562061c54eb6eb9863271524568761cf6
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Oct 15 08:52:08 2021 +0200

    c/102763 - fix ICE with invalid input to GIMPLE FE

    This fixes an ICE for the failure to verify we're dereferencing a
    pointer before throwing that at build_simple_mem_ref.

    2021-10-15  Richard Biener  <rguenther@suse.de>

            PR c/102763
    gcc/c/
            * gimple-parser.c
            (c_parser_gimple_postfix_expression_after_primary): Check
            for a pointer do be dereferenced by ->.

    gcc/testsuite/
            * gcc.dg/gimplefe-error-12.c: New testcase.

[Bug c/102763] ICE on gimple code: segmentation fault, build_component_ref

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102763

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
            Version|unknown                     |12.0

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.  Thanks for reporting.