* [Bug c++/99833] [8/9/10/11 Regression] structured binding + if init + generic lambda = internal compiler error
2021-03-30 17:17 [Bug c++/99833] New: structured binding + if init + generic lambda = internal compiler error nickgray0 at brown dot edu
@ 2021-03-30 20:24 ` mpolacek at gcc dot gnu.org
2021-03-30 20:57 ` mpolacek at gcc dot gnu.org
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From: mpolacek at gcc dot gnu.org @ 2021-03-30 20:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99833
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-03-30
Keywords| |ice-on-valid-code
Target Milestone|--- |8.5
Status|UNCONFIRMED |NEW
Summary|structured binding + if |[8/9/10/11 Regression]
|init + generic lambda = |structured binding + if
|internal compiler error |init + generic lambda =
| |internal compiler error
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
$ xg++-7 -c 99833.C -std=c++17 -fconcepts
# ok
$ xg++-8 -c 99833.C -std=c++17 -fconcepts
99833.C: In instantiation of ‘f(auto:1&&) [with auto:1 = int]::<lambda(auto:2
...)> [with auto:2 = {}]’:
99833.C:8:10: required from ‘auto f(auto:1&&) [with auto:1 = int]’
99833.C:12:13: required from here
99833.C:6:32: internal compiler error: in tsubst_decomp_names, at cp/pt.c:16673
if constexpr (auto [_, z] = y; requires { z; })
^~~~~~
0xa44cc6 tsubst_decomp_names
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16673
0xa46041 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16837
0xa4b103 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:17512
0xa46e75 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16961
0xa45012 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16714
0xa475be tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:17014
0xa475be tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:17014
0xa45012 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16714
0xa475be tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:17014
0xa68a40 instantiate_decl(tree_node*, bool, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:24161
0x90b1e3 maybe_instantiate_decl
/home/mpolacek/src/gcc8/gcc/cp/decl2.c:5211
0x90bb8a mark_used(tree_node*, int)
/home/mpolacek/src/gcc8/gcc/cp/decl2.c:5312
0x814c71 build_over_call
/home/mpolacek/src/gcc8/gcc/cp/call.c:8286
0x804e91 build_op_call_1
/home/mpolacek/src/gcc8/gcc/cp/call.c:4589
0x805053 build_op_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int)
/home/mpolacek/src/gcc8/gcc/cp/call.c:4618
0xa9a847 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
/home/mpolacek/src/gcc8/gcc/cp/semantics.c:2567
0xa503bf tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:18594
0xa4b422 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:17530
0xa4512d tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16728
0xa45012 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc8/gcc/cp/pt.c:16714
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2021-03-30 20:24 ` [Bug c++/99833] [8/9/10/11 Regression] " mpolacek at gcc dot gnu.org
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To: gcc-bugs
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Build|-std=c++20 |
CC| |ppalka at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r11-372. So may be a P1 :(.
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2021-03-30 20:24 ` [Bug c++/99833] [8/9/10/11 Regression] " mpolacek at gcc dot gnu.org
2021-03-30 20:57 ` mpolacek at gcc dot gnu.org
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To: gcc-bugs
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Reduced:
namespace std {
template <int __v> struct integral_constant {
static constexpr int value = __v;
};
template <typename> struct tuple_size;
template <unsigned long, typename> struct tuple_element;
template <long __i, typename _Tp>
using __tuple_element_t = typename tuple_element<__i, _Tp>::type;
template <typename...> class tuple;
template <typename... _UTypes> tuple(_UTypes...) -> tuple<_UTypes...>;
template <typename _T1, typename _T2> class tuple<_T1, _T2> {
public:
template <typename _U1, typename _U2> tuple(_U1, _U2);
};
template <typename... _Elements>
struct tuple_size<tuple<_Elements...>>
: integral_constant<sizeof...(_Elements)> {};
template <unsigned long __i, typename _Head, typename... _Tail>
struct tuple_element<__i, tuple<_Head, _Tail...>>
: tuple_element<__i - 1, tuple<_Tail...>> {};
template <typename _Head, typename... _Tail>
struct tuple_element<0, tuple<_Head, _Tail...>> {
typedef _Head type;
};
template <long __i, typename... _Elements>
__tuple_element_t<__i, tuple<_Elements...>> get(tuple<_Elements...>);
} // namespace std
void f(auto x) {
[&](auto...) {
auto y = std::tuple{"", x};
if constexpr (auto [_, z] = y; requires { z; })
;
}();
}
auto main() -> int { f(2); }
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Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
Status|NEW |ASSIGNED
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To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #2)
> Started with r11-372. So may be a P1 :(.
But you show GCC 8 has the same issue ...
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--- Comment #5 from Patrick Palka <ppalka at gcc dot gnu.org> ---
It looks like GCC 10.1 accepts this testcase, and 10.2, 10.3 and 11 reject.
The requires-expression is a red herring, we can trigger the ICE without it:
#include <tuple>
template<class> void f() {
[] (auto x) {
if constexpr (auto [a, b] = std::tuple{x, x}; sizeof(a) > 1)
;
}(0);
}
template void f<int>();
The ICE for this one isn't a regression it seems.
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To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99833
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That reduced:
template <class>
void
foo ()
{
[](auto d) { if constexpr (auto [a, b]{d}; a) ; } (0);
}
template void foo<int> ();
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And hopefully valid variant thereof:
struct S { int a, b; };
template <class>
void
foo ()
{
[](auto d) { if constexpr (auto [a, b]{d}; sizeof (a) > 0) a++; } (S{});
}
template void foo<S> ();
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And that ICEs since r7-4511-g70f40fea6a317d7be82d1f02defb59381c7752e7 when
structured binding support has been added, first with
internal compiler error: in is_normal_capture_proxy, at cp/lambda.c:271
then is accepted since r8-6835-g6f58bc5825c0d0ff0606b747b01bb2dcff882a1d
and then since r8-7613-g1456e764105702a0bb6c9be13d8eef7f21990a79 ICEs in
tsubst_decomp_names.
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To: gcc-bugs
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 50591
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50591&action=edit
gcc11-pr99833.patch
Untested fix. This seems to work for me...
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--- Comment #10 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #9)
> Created attachment 50591 [details]
> gcc11-pr99833.patch
>
> Untested fix. This seems to work for me...
Ah, I hadn't considered that the problem might be in extract_locals_spec.
You're much farther than I am on this PR :) Please feel free to take it.
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--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:20eb7a1891cfd7fa85295a236cebe0322d041edd
commit r11-8209-g20eb7a1891cfd7fa85295a236cebe0322d041edd
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Apr 16 09:32:44 2021 +0200
c++: Fix up handling of structured bindings in extract_locals_r [PR99833]
The following testcase ICEs in tsubst_decomp_names because the assumptions
that the structured binding artificial var is followed in DECL_CHAIN by
the corresponding structured binding vars is violated.
I've tracked it to extract_locals* which is done for the constexpr
IF_STMT. extract_locals_r when it sees a DECL_EXPR adds that decl
into a hash set so that such decls aren't returned from extract_locals*,
but in the case of a structured binding that just means the artificial var
and not the vars corresponding to structured binding identifiers.
The following patch fixes it by pushing not just the artificial var
for structured bindings but also the other vars.
2021-04-16 Jakub Jelinek <jakub@redhat.com>
PR c++/99833
* pt.c (extract_locals_r): When handling DECL_EXPR of a structured
binding, add to data.internal also all corresponding structured
binding decls.
* g++.dg/cpp1z/pr99833.C: New test.
* g++.dg/cpp2a/pr99833.C: New test.
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To: gcc-bugs
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8/9/10/11 Regression] |[8/9/10 Regression]
|structured binding + if |structured binding + if
|init + generic lambda = |init + generic lambda =
|internal compiler error |internal compiler error
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
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--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:06d50ebc9fb2761ed2bdda5e76adb4d47a8ca983
commit r10-9728-g06d50ebc9fb2761ed2bdda5e76adb4d47a8ca983
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Apr 16 09:32:44 2021 +0200
c++: Fix up handling of structured bindings in extract_locals_r [PR99833]
The following testcase ICEs in tsubst_decomp_names because the assumptions
that the structured binding artificial var is followed in DECL_CHAIN by
the corresponding structured binding vars is violated.
I've tracked it to extract_locals* which is done for the constexpr
IF_STMT. extract_locals_r when it sees a DECL_EXPR adds that decl
into a hash set so that such decls aren't returned from extract_locals*,
but in the case of a structured binding that just means the artificial var
and not the vars corresponding to structured binding identifiers.
The following patch fixes it by pushing not just the artificial var
for structured bindings but also the other vars.
2021-04-16 Jakub Jelinek <jakub@redhat.com>
PR c++/99833
* pt.c (extract_locals_r): When handling DECL_EXPR of a structured
binding, add to data.internal also all corresponding structured
binding decls.
* g++.dg/cpp1z/pr99833.C: New test.
* g++.dg/cpp2a/pr99833.C: New test.
(cherry picked from commit 20eb7a1891cfd7fa85295a236cebe0322d041edd)
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From: jakub at gcc dot gnu.org @ 2021-04-20 9:53 UTC (permalink / raw)
To: gcc-bugs
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8/9/10 Regression] |[8/9 Regression] structured
|structured binding + if |binding + if init + generic
|init + generic lambda = |lambda = internal compiler
|internal compiler error |error
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 10.4 too.
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To: gcc-bugs
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--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:969999f7b35903338738c7e7e4d99aa929276404
commit r9-9447-g969999f7b35903338738c7e7e4d99aa929276404
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Apr 16 09:32:44 2021 +0200
c++: Fix up handling of structured bindings in extract_locals_r [PR99833]
The following testcase ICEs in tsubst_decomp_names because the assumptions
that the structured binding artificial var is followed in DECL_CHAIN by
the corresponding structured binding vars is violated.
I've tracked it to extract_locals* which is done for the constexpr
IF_STMT. extract_locals_r when it sees a DECL_EXPR adds that decl
into a hash set so that such decls aren't returned from extract_locals*,
but in the case of a structured binding that just means the artificial var
and not the vars corresponding to structured binding identifiers.
The following patch fixes it by pushing not just the artificial var
for structured bindings but also the other vars.
2021-04-16 Jakub Jelinek <jakub@redhat.com>
PR c++/99833
* pt.c (extract_locals_r): When handling DECL_EXPR of a structured
binding, add to data.internal also all corresponding structured
binding decls.
* g++.dg/cpp1z/pr99833.C: New test.
(cherry picked from commit 06d50ebc9fb2761ed2bdda5e76adb4d47a8ca983)
^ permalink raw reply [flat|nested] 19+ messages in thread* [Bug c++/99833] [8/9 Regression] structured binding + if init + generic lambda = internal compiler error
2021-03-30 17:17 [Bug c++/99833] New: structured binding + if init + generic lambda = internal compiler error nickgray0 at brown dot edu
` (15 preceding siblings ...)
2021-04-20 23:34 ` cvs-commit at gcc dot gnu.org
@ 2021-04-22 16:53 ` cvs-commit at gcc dot gnu.org
2021-04-22 17:11 ` jakub at gcc dot gnu.org
17 siblings, 0 replies; 19+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-22 16:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99833
--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:7285512d782ded76d1b0d0d164fdc1c5ab7e9fe0
commit r8-10910-g7285512d782ded76d1b0d0d164fdc1c5ab7e9fe0
Author: Jakub Jelinek <jakub@redhat.com>
Date: Fri Apr 16 09:32:44 2021 +0200
c++: Fix up handling of structured bindings in extract_locals_r [PR99833]
The following testcase ICEs in tsubst_decomp_names because the assumptions
that the structured binding artificial var is followed in DECL_CHAIN by
the corresponding structured binding vars is violated.
I've tracked it to extract_locals* which is done for the constexpr
IF_STMT. extract_locals_r when it sees a DECL_EXPR adds that decl
into a hash set so that such decls aren't returned from extract_locals*,
but in the case of a structured binding that just means the artificial var
and not the vars corresponding to structured binding identifiers.
The following patch fixes it by pushing not just the artificial var
for structured bindings but also the other vars.
2021-04-16 Jakub Jelinek <jakub@redhat.com>
PR c++/99833
* pt.c (extract_locals_r): When handling DECL_EXPR of a structured
binding, add to data.internal also all corresponding structured
binding decls.
* g++.dg/cpp1z/pr99833.C: New test.
(cherry picked from commit 06d50ebc9fb2761ed2bdda5e76adb4d47a8ca983)
^ permalink raw reply [flat|nested] 19+ messages in thread* [Bug c++/99833] [8/9 Regression] structured binding + if init + generic lambda = internal compiler error
2021-03-30 17:17 [Bug c++/99833] New: structured binding + if init + generic lambda = internal compiler error nickgray0 at brown dot edu
` (16 preceding siblings ...)
2021-04-22 16:53 ` cvs-commit at gcc dot gnu.org
@ 2021-04-22 17:11 ` jakub at gcc dot gnu.org
17 siblings, 0 replies; 19+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-04-22 17:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99833
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 19+ messages in thread