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* [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause
@ 2021-06-29 1:15 lewissbaker.opensource at gmail dot com
2021-06-29 8:11 ` [Bug c++/101247] " marxin at gcc dot gnu.org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: lewissbaker.opensource at gmail dot com @ 2021-06-29 1:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
Bug ID: 101247
Summary: ICE when using static constexpr bool defined in
base-class in derived class constructor
requires-clause
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lewissbaker.opensource at gmail dot com
Target Milestone: ---
Compiling the following code with GCC trunk and flags: -std=c++20
```
template<typename T>
struct in_place_type_t {};
template<typename T>
inline constexpr in_place_type_t<T> in_place_type;
template<typename T, typename... Ts>
inline constexpr bool outer_helper_v = true;
template<typename... Ts>
struct foo {
struct type;
template<typename U>
static constexpr bool helper_v = outer_helper_v<U, Ts...>;
};
template<typename... Ts>
struct foo<Ts...>::type {
template<typename U>
requires helper_v<U>
type(in_place_type_t<U>) {}
};
int main() {
foo<int>::type x(in_place_type<int>);
}
```
results in an internal compiler-error
```
<source>: In substitution of 'template<class U> requires helper_v<U>
foo<int>::type::type(in_place_type_t<T>) [with U = {int}]':
<source>:26:40: required from here
<source>:21:18: internal compiler error: tree check: accessed elt 1 of
'tree_vec' with 0 elts in tsubst_pack_expansion, at cp/pt.c:13084
21 | requires helper_v<U>
| ^~~~~~~~~~~
0x1d4c179 internal_error(char const*, ...)
???:0
0x685746 tree_vec_elt_check_failed(int, int, char const*, int, char const*)
???:0
0x99e0bc tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
???:0
0x9afa62 tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
???:0
0x9b064b tsubst_argument_pack(tree_node*, tree_node*, int, tree_node*)
???:0
0x9afa04 tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
???:0
0x983ebd tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0x7abcda constraints_satisfied_p(tree_node*, tree_node*)
???:0
0x9c26c3 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, conversion**, bool,
bool)
???:0
0x74abc9 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
???:0
0x74c8c0 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
???:0
0x8611c8 build_aggr_init(tree_node*, tree_node*, int, int)
???:0
0x81f0d9 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
???:0
0x94f36d c_parse_file()
???:0
0xad2922 c_common_parse_file()
???:0
```
See https://godbolt.org/z/ebnxfsMs9 for an example.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
@ 2021-06-29 8:11 ` marxin at gcc dot gnu.org
2021-06-30 18:16 ` [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested " ppalka at gcc dot gnu.org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: marxin at gcc dot gnu.org @ 2021-06-29 8:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Last reconfirmed| |2021-06-29
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r10-3735-gcb57504a55015891.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
2021-06-29 8:11 ` [Bug c++/101247] " marxin at gcc dot gnu.org
@ 2021-06-30 18:16 ` ppalka at gcc dot gnu.org
2021-07-02 17:55 ` cvs-commit at gcc dot gnu.org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-06-30 18:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
CC| |ppalka at gcc dot gnu.org
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
2021-06-29 8:11 ` [Bug c++/101247] " marxin at gcc dot gnu.org
2021-06-30 18:16 ` [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested " ppalka at gcc dot gnu.org
@ 2021-07-02 17:55 ` cvs-commit at gcc dot gnu.org
2021-07-09 14:22 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-07-02 17:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:e3528ce197f8886869f95e8a8f901861a319851c
commit r12-1989-ge3528ce197f8886869f95e8a8f901861a319851c
Author: Patrick Palka <ppalka@redhat.com>
Date: Fri Jul 2 13:54:57 2021 -0400
c++: unqualified member template in constraint [PR101247]
Here any_template_parm_r is failing to mark the template parameters
implicitly used by the unqualified use of 'd' inside the constraint
because the code to do so assumes each level of a template parameter
list points to the corresponding primary template, but here the
parameter level for A in the out-of-line definition of A::B does not
(nor do the parameter levels for A and C in the definition of A::C),
which causes us to overlook the sharing.
So it seems we can't in general depend on the TREE_TYPE of a template
parameter level being non-empty here. This patch partially fixes this
by rewriting the relevant part of any_template_parm_r to not depend on
the TREE_TYPE of outer levels. We still depend on the innermost level
to point to the innermost primary template, so we still crash on the
commented out line in the below testcase.
PR c++/101247
gcc/cp/ChangeLog:
* pt.c (any_template_parm_r) <case TEMPLATE_DECL>: Rewrite to
use common_enclosing_class and to not depend on the TREE_TYPE
of outer levels pointing to the corresponding primary template.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-memtmpl4.C: New test.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
` (2 preceding siblings ...)
2021-07-02 17:55 ` cvs-commit at gcc dot gnu.org
@ 2021-07-09 14:22 ` cvs-commit at gcc dot gnu.org
2021-07-13 14:03 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-07-09 14:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:f53e66019df819f55d424cc56f8b0ea81c074b55
commit r12-2221-gf53e66019df819f55d424cc56f8b0ea81c074b55
Author: Patrick Palka <ppalka@redhat.com>
Date: Fri Jul 9 10:20:22 2021 -0400
c++: find_template_parameters and TEMPLATE_DECLs [PR101247]
r12-1989 fixed the testcase in the PR, but unfortunately the fix is
buggy: it breaks the case where the common template between the
TEMPLATE_DECL t and ctx_parms is the innermost template (as in
concepts-memtmpl5.C below). This can be fixed by instead passing the
TREE_TYPE of ctmpl to common_enclosing_class when ctmpl is a class
template.
But even after that's fixed, the analogous case where the innermost
template is a partial specialization is still broken (as in
concepts-memtmpl5a.C below), because ctmpl is always a primary template.
So this patch instead takes a diferent approach that doesn't rely on
ctx_parms at all: when looking for the template parameters of a
TEMPLATE_DECL that are shared with the current template context, just
walk its DECL_CONTEXT. As long as the template is not overly general
(e.g. we didn't pass it through most_general_template), this should give
us exactly what we want, since if a TEMPLATE_DECL can be referred to
from some template context then the template parameters it uses must all
be in-scope and contained in its DECL_CONTEXT. This effectively makes
us treat TEMPLATE_DECLs more similarly to other _DECLs (whose DECL_CONTEXT
we also walk).
PR c++/101247
gcc/cp/ChangeLog:
* pt.c (any_template_parm_r) <case TEMPLATE_DECL>: Just walk the
DECL_CONTEXT.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-memtmpl4.C: Uncomment the commented out
example, which we now handle correctly.
* g++.dg/cpp2a/concepts-memtmpl5.C: New test.
* g++.dg/cpp2a/concepts-memtmpl5a.C: New test.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
` (3 preceding siblings ...)
2021-07-09 14:22 ` cvs-commit at gcc dot gnu.org
@ 2021-07-13 14:03 ` cvs-commit at gcc dot gnu.org
2021-07-13 14:03 ` cvs-commit at gcc dot gnu.org
2021-07-13 14:09 ` ppalka at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-07-13 14:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:2902f2d8424cfa365fec49401fa066e2b6de9ca4
commit r11-8732-g2902f2d8424cfa365fec49401fa066e2b6de9ca4
Author: Patrick Palka <ppalka@redhat.com>
Date: Fri Jul 2 13:54:57 2021 -0400
c++: unqualified member template in constraint [PR101247]
Here any_template_parm_r is failing to mark the template parameters
implicitly used by the unqualified use of 'd' inside the constraint
because the code to do so assumes each level of a template parameter
list points to the corresponding primary template, but here the
parameter level for A in the out-of-line definition of A::B does not
(nor do the parameter levels for A and C in the definition of A::C),
which causes us to overlook the sharing.
So it seems we can't in general depend on the TREE_TYPE of a template
parameter level being non-empty here. This patch partially fixes this
by rewriting the relevant part of any_template_parm_r to not depend on
the TREE_TYPE of outer levels. We still depend on the innermost level
to point to the innermost primary template, so we still crash on the
commented out line in the below testcase.
PR c++/101247
gcc/cp/ChangeLog:
* pt.c (any_template_parm_r) <case TEMPLATE_DECL>: Rewrite to
use common_enclosing_class and to not depend on the TREE_TYPE
of outer levels pointing to the corresponding primary template.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-memtmpl4.C: New test.
(cherry picked from commit e3528ce197f8886869f95e8a8f901861a319851c)
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
` (4 preceding siblings ...)
2021-07-13 14:03 ` cvs-commit at gcc dot gnu.org
@ 2021-07-13 14:03 ` cvs-commit at gcc dot gnu.org
2021-07-13 14:09 ` ppalka at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-07-13 14:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:6d11dd94e53103641f9826b14e3086399f2a948c
commit r11-8733-g6d11dd94e53103641f9826b14e3086399f2a948c
Author: Patrick Palka <ppalka@redhat.com>
Date: Fri Jul 9 10:20:22 2021 -0400
c++: find_template_parameters and TEMPLATE_DECLs [PR101247]
r12-1989 fixed the testcase in the PR, but unfortunately the fix is
buggy: it breaks the case where the common template between the
TEMPLATE_DECL t and ctx_parms is the innermost template (as in
concepts-memtmpl5.C below). This can be fixed by instead passing the
TREE_TYPE of ctmpl to common_enclosing_class when ctmpl is a class
template.
But even after that's fixed, the analogous case where the innermost
template is a partial specialization is still broken (as in
concepts-memtmpl5a.C below), because ctmpl is always a primary template.
So this patch instead takes a diferent approach that doesn't rely on
ctx_parms at all: when looking for the template parameters of a
TEMPLATE_DECL that are shared with the current template context, just
walk its DECL_CONTEXT. As long as the template is not overly general
(e.g. we didn't pass it through most_general_template), this should give
us exactly what we want, since if a TEMPLATE_DECL can be referred to
from some template context then the template parameters it uses must all
be in-scope and contained in its DECL_CONTEXT. This effectively makes
us treat TEMPLATE_DECLs more similarly to other _DECLs (whose DECL_CONTEXT
we also walk).
PR c++/101247
gcc/cp/ChangeLog:
* pt.c (any_template_parm_r) <case TEMPLATE_DECL>: Just walk the
DECL_CONTEXT.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-memtmpl4.C: Uncomment the commented out
example, which we now handle correctly.
* g++.dg/cpp2a/concepts-memtmpl5.C: New test.
* g++.dg/cpp2a/concepts-memtmpl5a.C: New test.
(cherry picked from commit f53e66019df819f55d424cc56f8b0ea81c074b55)
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested class constructor requires-clause
2021-06-29 1:15 [Bug c++/101247] New: ICE when using static constexpr bool defined in base-class in derived class constructor requires-clause lewissbaker.opensource at gmail dot com
` (5 preceding siblings ...)
2021-07-13 14:03 ` cvs-commit at gcc dot gnu.org
@ 2021-07-13 14:09 ` ppalka at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-07-13 14:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101247
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Target Milestone|--- |11.2
Resolution|--- |FIXED
--- Comment #6 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Fixed for GCC 11.2/12
^ permalink raw reply [flat|nested] 8+ messages in thread
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2021-06-29 8:11 ` [Bug c++/101247] " marxin at gcc dot gnu.org
2021-06-30 18:16 ` [Bug c++/101247] ICE when using static constexpr bool defined in parent-class in nested " ppalka at gcc dot gnu.org
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