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* [gcc r10-10304] libstdc++: Value-initialize objects held by EBO helpers [PR 100863]
@ 2021-11-26 16:34 Jonathan Wakely
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From: Jonathan Wakely @ 2021-11-26 16:34 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:cc56c03a7a7f034f98a835dcb7047ad3d2ace6bd
commit r10-10304-gcc56c03a7a7f034f98a835dcb7047ad3d2ace6bd
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Jun 2 12:34:48 2021 +0100
libstdc++: Value-initialize objects held by EBO helpers [PR 100863]
The allocator, hash function and equality function should all be
value-initialized by the default constructor of an unordered container.
Do it in the EBO helper, so we don't have to get it right in multiple
places.
Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
PR libstdc++/100863
PR libstdc++/65816
* include/bits/hashtable_policy.h (_Hashtable_ebo_helper):
Value-initialize subobject.
* testsuite/23_containers/unordered_map/allocator/default_init.cc:
Remove XFAIL.
* testsuite/23_containers/unordered_set/allocator/default_init.cc:
Remove XFAIL.
(cherry picked from commit f8f0193b5b83f6e85d65015e79c803295baf5166)
Diff:
---
libstdc++-v3/include/bits/hashtable_policy.h | 5 +++--
.../testsuite/23_containers/unordered_map/allocator/default_init.cc | 1 -
.../testsuite/23_containers/unordered_set/allocator/default_init.cc | 1 -
3 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/libstdc++-v3/include/bits/hashtable_policy.h b/libstdc++-v3/include/bits/hashtable_policy.h
index d34fc39a973..63958cc1d9c 100644
--- a/libstdc++-v3/include/bits/hashtable_policy.h
+++ b/libstdc++-v3/include/bits/hashtable_policy.h
@@ -1109,7 +1109,7 @@ namespace __detail
struct _Hashtable_ebo_helper<_Nm, _Tp, true>
: private _Tp
{
- _Hashtable_ebo_helper() = default;
+ _Hashtable_ebo_helper() noexcept(noexcept(_Tp())) : _Tp() { }
template<typename _OtherTp>
_Hashtable_ebo_helper(_OtherTp&& __tp)
@@ -1135,7 +1135,7 @@ namespace __detail
_Tp& _M_get() { return _M_tp; }
private:
- _Tp _M_tp;
+ _Tp _M_tp{};
};
/**
@@ -1789,6 +1789,7 @@ namespace __detail
protected:
_Hashtable_base() = default;
+
_Hashtable_base(const _ExtractKey& __ex, const _H1& __h1, const _H2& __h2,
const _Hash& __hash, const _Equal& __eq)
: __hash_code_base(__ex, __h1, __h2, __hash), _EqualEBO(__eq)
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc b/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc
index 473a5f1ce47..3da42453152 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_map/allocator/default_init.cc
@@ -17,7 +17,6 @@
// { dg-do run { target c++11 } }
// { dg-options "-O0" }
-// { dg-xfail-run-if "PR c++/65816" { *-*-* } }
#include <unordered_map>
#include <testsuite_hooks.h>
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc b/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc
index 37110dd6eb0..1f2f3516859 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_set/allocator/default_init.cc
@@ -17,7 +17,6 @@
// { dg-do run { target c++11 } }
// { dg-options "-O0" }
-// { dg-xfail-run-if "PR c++/65816" { *-*-* } }
#include <unordered_set>
#include <testsuite_hooks.h>
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