Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterSaveLayout.java @ 23398:3e8ce13f4e12
minimize diff to jvmci-9
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 17 May 2016 21:10:34 +0200 |
parents | 1bbd4a7c274b |
children | 9e1235406b59 |
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/* * Copyright (c) 2013, 2014, 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. */ package jdk.vm.ci.code; import java.util.Arrays; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.TreeMap; /** * A map from registers to frame slots. This can be used to describe where callee saved registers * are saved in a callee's frame. */ public final class RegisterSaveLayout { /** * Keys. */ private final Register[] registers; /** * Slot indexes relative to stack pointer. */ private final int[] slots; /** * Creates a map from registers to frame slots. * * @param registers the keys in the map * @param slots frame slot index for each register in {@code registers} */ public RegisterSaveLayout(Register[] registers, int[] slots) { assert registers.length == slots.length; this.registers = registers; this.slots = slots; assert registersToSlots(false).size() == registers.length : "non-unique registers"; assert new HashSet<>(registersToSlots(false).values()).size() == slots.length : "non-unqiue slots"; } /** * Gets the frame slot index for a given register. * * @param register register to get the frame slot index for * @return frame slot index */ public int registerToSlot(Register register) { for (int i = 0; i < registers.length; i++) { if (register.equals(registers[i])) { return slots[i]; } } throw new IllegalArgumentException(register + " not saved by this layout: " + this); } /** * Gets this layout information as a {@link Map} from registers to slots. */ public Map<Register, Integer> registersToSlots(boolean sorted) { Map<Register, Integer> result; if (sorted) { result = new TreeMap<>(); } else { result = new HashMap<>(); } for (int i = 0; i < registers.length; i++) { result.put(registers[i], slots[i]); } return result; } /** * Gets this layout information as a {@link Map} from slots to registers. */ public Map<Integer, Register> slotsToRegisters(boolean sorted) { Map<Integer, Register> result; if (sorted) { result = new TreeMap<>(); } else { result = new HashMap<>(); } for (int i = 0; i < registers.length; i++) { result.put(slots[i], registers[i]); } return result; } @Override public int hashCode() { throw new UnsupportedOperationException(); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof RegisterSaveLayout) { RegisterSaveLayout that = (RegisterSaveLayout) obj; if (Arrays.equals(registers, that.registers) && Arrays.equals(slots, that.slots)) { return true; } } return false; } @Override public String toString() { return registersToSlots(true).toString(); } }