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Quellcode-Bibliothek© Kompilation durch diese Firma[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]Datei: zGlobals_x86.cpp Sprache: C |
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/*
* Copyright (c) 2017, 2021, 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. */ #include "precompiled.hpp" #include "gc/shared/gc_globals.hpp" #include "gc/z/zGlobals.hpp" #include "runtime/globals.hpp" #include "utilities/globalDefinitions.hpp" #include "utilities/powerOfTwo.hpp" // // The heap can have three different layouts, depending on the max heap size. // // Address Space & Pointer Layout 1 // -------------------------------- // // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) // . . // . . // . . // +--------------------------------+ 0x0000014000000000 (20TB) // | Remapped View | // +--------------------------------+ 0x0000010000000000 (16TB) // . . // +--------------------------------+ 0x00000c0000000000 (12TB) // | Marked1 View | // +--------------------------------+ 0x0000080000000000 (8TB) // | Marked0 View | // +--------------------------------+ 0x0000040000000000 (4TB) // . . // +--------------------------------+ 0x0000000000000000 // // 6 4 4 4 4 // 3 6 5 2 1 0 // +--------------------+----+-----------------------------------------------+ // |00000000 00000000 00|1111|11 11111111 11111111 11111111 11111111 11111111| // +--------------------+----+-----------------------------------------------+ // | | | // | | * 41-0 Object Offset (42-bits, 4TB address space) // | | // | * 45-42 Metadata Bits (4-bits) 0001 = Marked0 (Address view 4-8TB) // | 0010 = Marked1 (Address view 8-12TB) // | 0100 = Remapped (Address view 16-20TB) // | 1000 = Finalizable (Address view N/A) // | // * 63-46 Fixed (18-bits, always zero) // // // Address Space & Pointer Layout 2 // -------------------------------- // // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) // . . // . . // . . // +--------------------------------+ 0x0000280000000000 (40TB) // | Remapped View | // +--------------------------------+ 0x0000200000000000 (32TB) // . . // +--------------------------------+ 0x0000180000000000 (24TB) // | Marked1 View | // +--------------------------------+ 0x0000100000000000 (16TB) // | Marked0 View | // +--------------------------------+ 0x0000080000000000 (8TB) // . . // +--------------------------------+ 0x0000000000000000 // // 6 4 4 4 4 // 3 7 6 3 2 0 // +------------------+-----+------------------------------------------------+ // |00000000 00000000 0|1111|111 11111111 11111111 11111111 11111111 11111111| // +-------------------+----+------------------------------------------------+ // | | | // | | * 42-0 Object Offset (43-bits, 8TB address space) // | | // | * 46-43 Metadata Bits (4-bits) 0001 = Marked0 (Address view 8-16TB) // | 0010 = Marked1 (Address view 16-24TB) // | 0100 = Remapped (Address view 32-40TB) // | 1000 = Finalizable (Address view N/A) // | // * 63-47 Fixed (17-bits, always zero) // // // Address Space & Pointer Layout 3 // -------------------------------- // // +--------------------------------+ 0x00007FFFFFFFFFFF (127TB) // . . // . . // . . // +--------------------------------+ 0x0000500000000000 (80TB) // | Remapped View | // +--------------------------------+ 0x0000400000000000 (64TB) // . . // +--------------------------------+ 0x0000300000000000 (48TB) // | Marked1 View | // +--------------------------------+ 0x0000200000000000 (32TB) // | Marked0 View | // +--------------------------------+ 0x0000100000000000 (16TB) // . . // +--------------------------------+ 0x0000000000000000 // // 6 4 4 4 4 // 3 8 7 4 3 0 // +------------------+----+-------------------------------------------------+ // |00000000 00000000 |1111|1111 11111111 11111111 11111111 11111111 11111111| // +------------------+----+-------------------------------------------------+ // | | | // | | * 43-0 Object Offset (44-bits, 16TB address space) // | | // | * 47-44 Metadata Bits (4-bits) 0001 = Marked0 (Address view 16-32TB) // | 0010 = Marked1 (Address view 32-48TB) // | 0100 = Remapped (Address view 64-80TB) // | 1000 = Finalizable (Address view N/A) // | // * 63-48 Fixed (16-bits, always zero) // size_t ZPlatformAddressOffsetBits() { const size_t min_address_offset_bits = 42; // 4TB const size_t max_address_offset_bits = 44; // 16TB const size_t address_offset = round_up_power_of_2(MaxHeapSize * ZVirtualToPhysicalRati const size_t address_offset_bits = log2i_exact(address_offset); return clamp(address_offset_bits, min_address_offset_bits, max_address_offset_bits) } size_t ZPlatformAddressMetadataShift() { return ZPlatformAddressOffsetBits(); } ¤ Dauer der Verarbeitung: 0.0 Sekunden (vorverarbeitet) ¤ |
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