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* [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template
@ 2020-10-23 1:14 hello at josephloser dot com
2020-10-26 16:49 ` [Bug c++/97536] " mpolacek at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: hello at josephloser dot com @ 2020-10-23 1:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97536
Bug ID: 97536
Summary: [concepts] parser segfault for concept defined in
function template
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hello at josephloser dot com
Target Milestone: ---
The code below causes a segfault when parsing a concept definition inside a
function template. Note that concepts cannot be defined inside a function
scope, so this should result in a useful diagnostic.
Output of compiling the program with -std=c++2a:
prog.cc: In function 'auto foo()':
prog.cc:3:5: warning: C++20 concept definition syntax is 'concept <name> =
<expr>'
3 | concept bar = true;
| ^~~~~~~
prog.cc:3:13: internal compiler error: Segmentation fault
3 | concept bar = true;
| ^~~
0xc2e30f crash_signal
../../source/gcc/toplev.c:330
0x68c49c grokvardecl
../../source/gcc/cp/decl.c:10103
0x68c49c grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
../../source/gcc/cp/decl.c:13691
0x6913c8 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
../../source/gcc/cp/decl.c:5218
0x71cc3e cp_parser_init_declarator
../../source/gcc/cp/parser.c:20934
0x6fe49c cp_parser_simple_declaration
../../source/gcc/cp/parser.c:13876
0x7002ad cp_parser_declaration_statement
../../source/gcc/cp/parser.c:13316
0x700e97 cp_parser_statement
../../source/gcc/cp/parser.c:11562
0x701e6d cp_parser_statement_seq_opt
../../source/gcc/cp/parser.c:11928
0x701f20 cp_parser_compound_statement
../../source/gcc/cp/parser.c:11878
0x718d2a cp_parser_function_body
../../source/gcc/cp/parser.c:23236
0x718d2a cp_parser_ctor_initializer_opt_and_function_body
../../source/gcc/cp/parser.c:23287
0x71c730 cp_parser_function_definition_after_declarator
../../source/gcc/cp/parser.c:29182
0x71d64f cp_parser_function_definition_from_specifiers_and_declarator
../../source/gcc/cp/parser.c:29098
0x71d64f cp_parser_init_declarator
../../source/gcc/cp/parser.c:20838
0x722c14 cp_parser_single_declaration
../../source/gcc/cp/parser.c:29669
0x722d77 cp_parser_template_declaration_after_parameters
../../source/gcc/cp/parser.c:29242
0x72337a cp_parser_explicit_template_declaration
../../source/gcc/cp/parser.c:29507
0x726cd9 cp_parser_declaration
../../source/gcc/cp/parser.c:13524
0x72726d cp_parser_translation_unit
../../source/gcc/cp/parser.c:4793
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.
Wandbox link: https://wandbox.org/permlink/PKqzkXQLl3fv8ev4
For what its worth, the warning given for when a concept is defined inside a
function (not a function template) could probably be improved as well. If you
remove the template on `foo` such that it is just a function, the error is:
prog.cc: In function 'auto foo()':
prog.cc:2:5: warning: C++20 concept definition syntax is 'concept <name> =
<expr>'
2 | concept bar = true;
| ^~~~~~~
prog.cc:2:5: error: a non-template variable cannot be 'concept'
The error message is fine, but the warning is a bit of a misnomer as `concept
bar = true;` does meet the grammar of `concept <name> = <expr>`.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/97536] [concepts] parser segfault for concept defined in function template
2020-10-23 1:14 [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template hello at josephloser dot com
@ 2020-10-26 16:49 ` mpolacek at gcc dot gnu.org
2021-03-30 15:52 ` mpolacek at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-10-26 16:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97536
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
CC| |mpolacek at gcc dot gnu.org
Last reconfirmed| |2020-10-26
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/97536] [concepts] parser segfault for concept defined in function template
2020-10-23 1:14 [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template hello at josephloser dot com
2020-10-26 16:49 ` [Bug c++/97536] " mpolacek at gcc dot gnu.org
@ 2021-03-30 15:52 ` mpolacek at gcc dot gnu.org
2021-04-19 22:06 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2021-03-30 15:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97536
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Still present, just hit this with
template <typename> void forward() {
concept C = true;
}
Let me take a look then...
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/97536] [concepts] parser segfault for concept defined in function template
2020-10-23 1:14 [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template hello at josephloser dot com
2020-10-26 16:49 ` [Bug c++/97536] " mpolacek at gcc dot gnu.org
2021-03-30 15:52 ` mpolacek at gcc dot gnu.org
@ 2021-04-19 22:06 ` cvs-commit at gcc dot gnu.org
2021-04-19 22:07 ` mpolacek at gcc dot gnu.org
2022-01-04 2:20 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-19 22:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97536
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:
https://gcc.gnu.org/g:29d8838c5ecaf70ce552fea7639ec1f34adb2e04
commit r11-8252-g29d8838c5ecaf70ce552fea7639ec1f34adb2e04
Author: Marek Polacek <polacek@redhat.com>
Date: Mon Apr 19 16:21:46 2021 -0400
c++: ICE with concept defined in function [PR97536]
This is an ICE-on-invalid, but I keep seeing it when reducing code so
I'd like to fix it. We crash on
template <typename> void forward() {
concept C = true;
}
which breaks two requirements:
[temp.concept]/1: A concept is a template ...
[temp.concept]/3: A concept-definition shall inhabit a namespace scope.
This patch adds a test that exercises broken code and fixes the ICE
by checking that a concept-definition is defined at namespace scope.
gcc/cp/ChangeLog:
PR c++/97536
* decl.c (grokvardecl): Given an error when a concept is not
defined
at namespace scope.
gcc/testsuite/ChangeLog:
PR c++/97536
* g++.dg/concepts/diagnostic16.C: New test.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/97536] [concepts] parser segfault for concept defined in function template
2020-10-23 1:14 [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template hello at josephloser dot com
` (2 preceding siblings ...)
2021-04-19 22:06 ` cvs-commit at gcc dot gnu.org
@ 2021-04-19 22:07 ` mpolacek at gcc dot gnu.org
2022-01-04 2:20 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2021-04-19 22:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97536
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed in GCC 11.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/97536] [concepts] parser segfault for concept defined in function template
2020-10-23 1:14 [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template hello at josephloser dot com
` (3 preceding siblings ...)
2021-04-19 22:07 ` mpolacek at gcc dot gnu.org
@ 2022-01-04 2:20 ` pinskia at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-04 2:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97536
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |11.0
^ permalink raw reply [flat|nested] 6+ messages in thread
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2020-10-23 1:14 [Bug c++/97536] New: [concepts] parser segfault for concept defined in function template hello at josephloser dot com
2020-10-26 16:49 ` [Bug c++/97536] " mpolacek at gcc dot gnu.org
2021-03-30 15:52 ` mpolacek at gcc dot gnu.org
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