From: "François Dumont" <frs.dumont@gmail.com>
To: Jonathan Wakely <jwakely.gcc@gmail.com>
Cc: Jonathan Wakely <jwakely@redhat.com>,
libstdc++ <libstdc++@gcc.gnu.org>,
gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: _LIBCXX_DEBUG value initialized singular iterators assert failures in std algorithms [PR104316]
Date: Sun, 17 Mar 2024 17:52:34 +0100 [thread overview]
Message-ID: <a2ff35d2-00bf-4fb1-bda8-81d8e0544fce@gmail.com> (raw)
In-Reply-To: <CAH6eHdT95bXuZZo7tzL7+WCAH+0k-tAn4BqUT+Pr33RLMDprSA@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1082 bytes --]
>
> OK for trunk, thanks!
>
> I think this is OK to backport to 13 too.
>
> Maybe after this we can define the __cpp_lib_null_itetators macro for
> debug mode?
>
After this fix of local_iterator I think we can indeed.
In fact the added 11316.cc was already passing for
unordered_set<>::local_iterator but simply because we were missing the
singular check. Both issues solved with this patch.
I found the version.def file to cleanup but no idea how to regenerate
version.h from it so I'll let you do it, ok ?
libstdc++: Fix _Safe_local_iterator<>::_M_valid_range
Unordered container local_iterator range shall not contain any singular
iterator unless both iterators are value-initialized.
libstdc++-v3/ChangeLog:
* include/debug/safe_local_iterator.tcc
(_Safe_local_iterator::_M_valid_range): Add
_M_value_initialized and
_M_singular checks.
* testsuite/23_containers/unordered_set/debug/114316.cc:
New test case.
Ok to commit ?
François
[-- Attachment #2: safe_local_iterator.txt --]
[-- Type: text/plain, Size: 1491 bytes --]
diff --git a/libstdc++-v3/include/debug/safe_local_iterator.tcc b/libstdc++-v3/include/debug/safe_local_iterator.tcc
index 90e60e37c32..6d546ec040c 100644
--- a/libstdc++-v3/include/debug/safe_local_iterator.tcc
+++ b/libstdc++-v3/include/debug/safe_local_iterator.tcc
@@ -78,7 +78,13 @@ namespace __gnu_debug
_M_valid_range(const _Safe_local_iterator& __rhs,
std::pair<difference_type, _Distance_precision>& __dist) const
{
- if (!_M_can_compare(__rhs))
+ if (_M_value_initialized() && __rhs._M_value_initialized())
+ {
+ __dist = { 0, __dp_exact };
+ return true;
+ }
+
+ if (_M_singular() || __rhs._M_singular() || !_M_can_compare(__rhs))
return false;
if (bucket() != __rhs.bucket())
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_set/debug/114316.cc b/libstdc++-v3/testsuite/23_containers/unordered_set/debug/114316.cc
new file mode 100644
index 00000000000..41b649a9cbd
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/unordered_set/debug/114316.cc
@@ -0,0 +1,28 @@
+// { dg-do run { target c++11 } }
+// { dg-require-debug-mode "" }
+
+// PR libstdc++/114316
+
+#include <unordered_set>
+#include <algorithm>
+
+#include <testsuite_hooks.h>
+
+void test01()
+{
+ std::unordered_set<int>::iterator it{};
+ VERIFY( std::find(it, it, 0) == it );
+}
+
+void test02()
+{
+ std::unordered_set<int>::local_iterator it{};
+ VERIFY( std::find(it, it, 0) == it );
+}
+
+int main()
+{
+ test01();
+ test02();
+ return 0;
+}
next prev parent reply other threads:[~2024-03-17 16:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-11 20:07 _LIBCXX_DEBUG value initialized singular iterators assert failures in std algorithms Maciej Miera
2024-03-11 20:40 ` Jonathan Wakely
2024-03-12 0:54 ` Maciej Miera
2024-03-12 1:03 ` Jonathan Wakely
2024-03-12 9:52 ` Jonathan Wakely
2024-03-14 21:49 ` _LIBCXX_DEBUG value initialized singular iterators assert failures in std algorithms [PR104316] François Dumont
2024-03-16 12:16 ` François Dumont
2024-03-17 11:45 ` Jonathan Wakely
2024-03-17 16:52 ` François Dumont [this message]
2024-03-17 18:14 ` François Dumont
2024-03-18 7:45 ` Jonathan Wakely
2024-03-18 21:38 ` François Dumont
2024-03-19 9:31 ` Jonathan Wakely
2024-03-19 15:41 ` Jonathan Wakely
2024-03-20 5:59 ` François Dumont
2024-03-20 9:02 ` Jonathan Wakely
2024-03-20 18:10 ` François Dumont
2024-03-21 6:20 ` Jonathan Wakely
2024-03-18 7:45 ` Jonathan Wakely
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