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79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_OOPS_KLASSFLAGS_HPP
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#define SHARE_OOPS_KLASSFLAGS_HPP
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#include "utilities/globalDefinitions.hpp"
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class outputStream;
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// The Klass class contains only parse-time flags and are used by generated code, even though
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// most apply to InstanceKlass, access is more straightforward through Klass pointers.
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// These flags are JVM internal and not part of the AccessFlags classfile specification.
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using klass_flags_t = u1;
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class KlassFlags {
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friend class VMStructs;
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friend class JVMCIVMStructs;
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public:
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#define KLASS_FLAGS_DO(flag) \
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flag(is_hidden_class , 1 << 0) \
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flag(is_value_based_class , 1 << 1) \
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flag(has_finalizer , 1 << 2) \
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flag(is_cloneable_fast , 1 << 3) \
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/* end of list */
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#define KLASS_FLAGS_ENUM_NAME(name, value) _misc_##name = value,
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enum {
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KLASS_FLAGS_DO(KLASS_FLAGS_ENUM_NAME)
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};
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#undef KLASS_FLAGS_ENUM_NAME
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// These flags are write-once before the class is published and then read-only
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// so don't require atomic updates.
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klass_flags_t _flags;
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public:
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KlassFlags() : _flags(0) {}
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klass_flags_t value() const { return _flags; }
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// Create getters and setters for the flag values.
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#define KLASS_FLAGS_GET_SET(name, ignore) \
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bool name() const { return (_flags & _misc_##name) != 0; } \
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void set_##name(bool b) { \
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assert(!name(), "set once"); \
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if (b) _flags |= _misc_##name; \
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}
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KLASS_FLAGS_DO(KLASS_FLAGS_GET_SET)
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#undef KLASS_FLAGS_GET_SET
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void print_on(outputStream* st) const;
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};
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#endif // SHARE_OOPS_KLASSFLAGS_HPP
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