1 /* 2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.code; 24 25 /** 26 * Represents a location where a value can be stored. This can be either a {@link Register} or a 27 * stack slot. 28 */ 29 public final class Location { 30 31 public final Register reg; 32 public final int offset; 33 34 private Location(Register reg, int offset) { 35 this.reg = reg; 36 this.offset = offset; 37 } 38 39 /** 40 * Create a {@link Location} for a register. 41 */ 42 public static Location register(Register reg) { 43 return new Location(reg, 0); 44 } 45 46 /** 47 * Create a {@link Location} for a vector subregister. 48 * 49 * @param reg the {@link Register vector register} 50 * @param offset the offset in bytes into the vector register 51 */ 52 public static Location subregister(Register reg, int offset) { 53 return new Location(reg, offset); 54 } 55 56 /** 57 * Create a {@link Location} for a stack slot. 58 */ 59 public static Location stack(int offset) { 60 return new Location(null, offset); 61 } 62 63 public boolean isRegister() { 64 return reg != null; 65 } 66 67 public boolean isStack() { 68 return reg == null; 69 } 70 71 @Override 72 public String toString() { 73 String regName; 74 if (isRegister()) { 75 regName = reg.name + ":"; 76 } else { 77 regName = "stack:"; 78 } 79 return regName + offset; 80 } 81 }