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8374623: Move DependentAlwaysFalse variable template to its own file

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Reviewed-by: jsjolen
This commit is contained in:
Kim Barrett 2026-01-07 10:06:29 +00:00
parent 7e18de137c
commit 2074b975c3
4 changed files with 41 additions and 11 deletions
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36
src/hotspot/share/metaprogramming/dependentAlwaysFalse.hpp Normal file
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@ -0,0 +1,36 @@
/*
* Copyright (c) 2025, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_METAPROGRAMMING_DEPENDENTALWAYSFALSE_HPP
#define SHARE_METAPROGRAMMING_DEPENDENTALWAYSFALSE_HPP
// This provides a workaround for static_assert(false) in discarded or
// otherwise uninstantiated places. Instead use
// static_assert(DependentAlwaysFalse<T>, "...")
// See http://wg21.link/p2593r1. Some, but not all, compiler versions we're
// using have implemented that change as a DR:
// https://cplusplus.github.io/CWG/issues/2518.html
template<typename T> inline constexpr bool DependentAlwaysFalse = false;
#endif // SHARE_METAPROGRAMMING_DEPENDENTALWAYSFALSE_HPP

3
src/hotspot/share/runtime/atomic.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2025, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -26,6 +26,7 @@
#define SHARE_RUNTIME_ATOMIC_HPP
#include "cppstdlib/type_traits.hpp"
#include "metaprogramming/dependentAlwaysFalse.hpp"
#include "metaprogramming/primitiveConversions.hpp"
#include "runtime/atomicAccess.hpp"
#include "utilities/globalDefinitions.hpp"

10
src/hotspot/share/utilities/globalDefinitions.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -1374,14 +1374,6 @@ template<typename K> int primitive_compare(const K& k0, const K& k1) {
template<typename T>
std::add_rvalue_reference_t<T> declval() noexcept;
// This provides a workaround for static_assert(false) in discarded or
// otherwise uninstantiated places. Instead use
// static_assert(DependentAlwaysFalse<T>, "...")
// See http://wg21.link/p2593r1. Some, but not all, compiler versions we're
// using have implemented that change as a DR:
// https://cplusplus.github.io/CWG/issues/2518.html
template<typename T> inline constexpr bool DependentAlwaysFalse = false;
// Quickly test to make sure IEEE-754 subnormal numbers are correctly
// handled.
bool IEEE_subnormal_handling_OK();

3
src/hotspot/share/utilities/lockFreeStack.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2019, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -25,6 +25,7 @@
#ifndef SHARE_UTILITIES_LOCKFREESTACK_HPP
#define SHARE_UTILITIES_LOCKFREESTACK_HPP
#include "metaprogramming/dependentAlwaysFalse.hpp"
#include "runtime/atomic.hpp"
#include "runtime/atomicAccess.hpp"
#include "utilities/debug.hpp"