| /* |
| * Copyright (c) 2016, 2018, 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_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP |
| #define SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP |
| |
| #include "jfr/utilities/jfrTypes.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "utilities/macros.hpp" |
| |
| #ifdef VM_LITTLE_ENDIAN |
| static const int low_offset = 0; |
| static const int leakp_offset = low_offset + 1; |
| #else |
| static const int low_offset = 7; |
| static const int leakp_offset = low_offset - 1; |
| #endif |
| |
| inline void set_bits(jbyte bits, jbyte* const dest) { |
| assert(dest != NULL, "invariant"); |
| const jbyte current = OrderAccess::load_acquire(dest); |
| if (bits != (current & bits)) { |
| *dest |= bits; |
| } |
| } |
| |
| inline void set_mask(jbyte mask, jbyte* const dest) { |
| assert(dest != NULL, "invariant"); |
| const jbyte current = OrderAccess::load_acquire(dest); |
| if (mask != (current & mask)) { |
| *dest &= mask; |
| } |
| } |
| |
| inline void set_bits_cas(jbyte bits, jbyte* const dest) { |
| assert(dest != NULL, "invariant"); |
| do { |
| const jbyte current = OrderAccess::load_acquire(dest); |
| if (bits == (current & bits)) { |
| return; |
| } |
| const jbyte new_value = current | bits; |
| if (Atomic::cmpxchg(new_value, dest, current) == current) { |
| return; |
| } |
| } while (true); |
| } |
| |
| inline void clear_bits_cas(jbyte bits, jbyte* const dest) { |
| assert(dest != NULL, "invariant"); |
| do { |
| const jbyte current = OrderAccess::load_acquire(dest); |
| if (bits != (current & bits)) { |
| return; |
| } |
| const jbyte new_value = current ^ bits; |
| if (Atomic::cmpxchg(new_value, dest, current) == current) { |
| return; |
| } |
| } while (true); |
| } |
| |
| inline void set_traceid_bits(jbyte bits, traceid* dest) { |
| set_bits(bits, ((jbyte*)dest) + low_offset); |
| } |
| |
| inline void set_traceid_bits_cas(jbyte bits, traceid* dest) { |
| set_bits_cas(bits, ((jbyte*)dest) + low_offset); |
| } |
| |
| inline void set_traceid_mask(jbyte mask, traceid* dest) { |
| set_mask(mask, ((jbyte*)dest) + low_offset); |
| } |
| |
| inline void set_leakp_traceid_bits(jbyte bits, traceid* dest) { |
| set_bits(bits, ((jbyte*)dest) + leakp_offset); |
| } |
| |
| inline void set_leakp_traceid_bits_cas(jbyte bits, traceid* dest) { |
| set_bits_cas(bits, ((jbyte*)dest) + leakp_offset); |
| } |
| |
| inline void set_leakp_traceid_mask(jbyte mask, traceid* dest) { |
| set_mask(mask, ((jbyte*)dest) + leakp_offset); |
| } |
| |
| #endif // SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDBITS_INLINE_HPP |
| |