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2019-03-11 Jonathan Wakely <jwakely@redhat.com>
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PR libstdc++/89629
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* libsupc++/hash_bytes.cc [__SIZEOF_SIZE_T__ == 8] (_Hash_bytes):
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Use correct type for len_aligned.
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* testsuite/20_util/hash/89629.cc: New test.
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--- libstdc++-v3/libsupc++/hash_bytes.cc (revision 269583)
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+++ libstdc++-v3/libsupc++/hash_bytes.cc (revision 269584)
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@@ -139,7 +139,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Remove the bytes not divisible by the sizeof(size_t). This
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// allows the main loop to process the data as 64-bit integers.
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- const int len_aligned = len & ~0x7;
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+ const size_t len_aligned = len & ~(size_t)0x7;
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const char* const end = buf + len_aligned;
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size_t hash = seed ^ (len * mul);
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for (const char* p = buf; p != end; p += 8)
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--- libstdc++-v3/testsuite/20_util/hash/89629.cc (nonexistent)
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+++ libstdc++-v3/testsuite/20_util/hash/89629.cc (revision 269584)
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@@ -0,0 +1,43 @@
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+// Copyright (C) 2019 Free Software Foundation, Inc.
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+//
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+// This file is part of the GNU ISO C++ Library. This library is free
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+// software; you can redistribute it and/or modify it under the
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+// terms of the GNU General Public License as published by the
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+// Free Software Foundation; either version 3, or (at your option)
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+// any later version.
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+
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+// This library is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU General Public License for more details.
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+
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+// You should have received a copy of the GNU General Public License along
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+// with this library; see the file COPYING3. If not see
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+// <http://www.gnu.org/licenses/>.
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+
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+// { dg-do run { target { lp64 || llp64 } } }
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+// { dg-require-effective-target c++11 }
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+// { dg-require-effective-target run_expensive_tests }
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+
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+#include <functional>
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+#include <string>
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+
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+void
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+test01()
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+{
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+ const std::size_t big = std::size_t(1) << 31;
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+ std::string s;
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+ try {
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+ s.resize(big, 'a');
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+ } catch (const std::bad_alloc&) {
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+ return; // try to avoid a FAIL if memory allocation fails
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+ }
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+ // PR libstdc++/89629
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+ (void) std::hash<std::string>{}(s);
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+}
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+
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+int
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+main()
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+{
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+ test01();
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+}
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