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71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
/*
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* Copyright (c) 1997, 2018, 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_VM_RUNTIME_FLAGS_FLAGSETTING_HPP
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#define SHARE_VM_RUNTIME_FLAGS_FLAGSETTING_HPP
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#include "memory/allocation.hpp"
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// debug flags control various aspects of the VM and are global accessible
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// use FlagSetting to temporarily change some debug flag
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// e.g. FlagSetting fs(DebugThisAndThat, true);
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// restored to previous value upon leaving scope
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class FlagSetting : public StackObj {
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bool val;
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bool* flag;
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public:
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FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
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~FlagSetting() { *flag = val; }
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};
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class UIntFlagSetting : public StackObj {
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uint val;
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uint* flag;
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public:
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UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
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~UIntFlagSetting() { *flag = val; }
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};
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class SizeTFlagSetting : public StackObj {
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size_t val;
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size_t* flag;
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public:
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SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
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~SizeTFlagSetting() { *flag = val; }
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};
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// Helper class for temporarily saving the value of a flag during a scope.
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template <size_t SIZE>
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class FlagGuard {
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unsigned char _value[SIZE];
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void* const _addr;
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public:
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FlagGuard(void* flag_addr) : _addr(flag_addr) { memcpy(_value, _addr, SIZE); }
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~FlagGuard() { memcpy(_addr, _value, SIZE); }
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};
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#define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
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#endif // SHARE_VM_RUNTIME_FLAGS_FLAGSETTING_HPP
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