/* * Copyright (c) 2015, 2022, 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.
*/
// The bad mask is 64 bit. Its high order 32 bits contain all possible value combinations // that this mask will have. Therefore, the memory where the 32 high order bits are stored, // can be used as a 32 bit GC epoch counter, that has a different bit pattern every time // the bad mask is flipped. This provides a pointer to said 32 bits. extern uint32_t* ZAddressBadMaskHighOrderBitsAddr; constint ZAddressBadMaskHighOrderBitsOffset = LITTLE_ENDIAN_ONLY(4) BIG_ENDIAN_ONLY(0);
// Pointer part of address extern size_t ZAddressOffsetBits; const size_t ZAddressOffsetShift = 0; extern uintptr_t ZAddressOffsetMask; extern size_t ZAddressOffsetMax;
// Metadata part of address const size_t ZAddressMetadataBits = 4; extern size_t ZAddressMetadataShift; extern uintptr_t ZAddressMetadataMask;
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