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/*
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* Copyright (c) 2016, 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_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
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#define SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
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#include "jfr/utilities/jfrTypes.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/orderAccess.inline.hpp"
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#include "utilities/macros.hpp"
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#ifdef VM_LITTLE_ENDIAN
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static const int low_offset = 0;
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static const int leakp_offset = low_offset + 1;
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#else
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static const int low_offset = 7;
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static const int leakp_offset = low_offset - 1;
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#endif
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inline void set_bits(jbyte bits, jbyte* const dest) {
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assert(dest != NULL, "invariant");
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const jbyte current = OrderAccess::load_acquire(dest);
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if (bits != (current & bits)) {
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*dest |= bits;
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}
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}
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inline void set_mask(jbyte mask, jbyte* const dest) {
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assert(dest != NULL, "invariant");
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const jbyte current = OrderAccess::load_acquire(dest);
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if (mask != (current & mask)) {
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*dest &= mask;
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}
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}
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inline void set_bits_cas(jbyte bits, jbyte* const dest) {
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assert(dest != NULL, "invariant");
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do {
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const jbyte current = OrderAccess::load_acquire(dest);
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if (bits == (current & bits)) {
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return;
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}
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const jbyte new_value = current | bits;
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if (Atomic::cmpxchg(new_value, dest, current) == current) {
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return;
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}
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} while (true);
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}
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inline void clear_bits_cas(jbyte bits, jbyte* const dest) {
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assert(dest != NULL, "invariant");
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do {
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const jbyte current = OrderAccess::load_acquire(dest);
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if (bits != (current & bits)) {
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return;
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}
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const jbyte new_value = current ^ bits;
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if (Atomic::cmpxchg(new_value, dest, current) == current) {
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return;
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}
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} while (true);
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}
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inline void set_traceid_bits(jbyte bits, traceid* dest) {
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set_bits(bits, ((jbyte*)dest) + low_offset);
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}
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inline void set_traceid_bits_cas(jbyte bits, traceid* dest) {
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set_bits_cas(bits, ((jbyte*)dest) + low_offset);
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}
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inline void set_traceid_mask(jbyte mask, traceid* dest) {
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set_mask(mask, ((jbyte*)dest) + low_offset);
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}
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inline void set_leakp_traceid_bits(jbyte bits, traceid* dest) {
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set_bits(bits, ((jbyte*)dest) + leakp_offset);
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}
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inline void set_leakp_traceid_bits_cas(jbyte bits, traceid* dest) {
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set_bits_cas(bits, ((jbyte*)dest) + leakp_offset);
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}
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inline void set_leakp_traceid_mask(jbyte mask, traceid* dest) {
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set_mask(mask, ((jbyte*)dest) + leakp_offset);
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}
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#endif // SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP
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