1 /* 2 * Copyright (c) 2013, 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 org.graalvm.compiler.asm.sparc; 24 25 import static jdk.vm.ci.sparc.SPARC.STACK_BIAS; 26 import static jdk.vm.ci.sparc.SPARC.fp; 27 import static jdk.vm.ci.sparc.SPARC.sp; 28 import jdk.vm.ci.code.Register; 29 import jdk.vm.ci.sparc.SPARC; 30 31 import org.graalvm.compiler.asm.AbstractAddress; 32 33 public class SPARCAddress extends AbstractAddress { 34 35 private final Register base; 36 private final Register index; 37 private final int displacement; 38 39 /** 40 * Creates an {@link SPARCAddress} with given base register, no scaling and a given 41 * displacement. 42 * 43 * @param base the base register 44 * @param displacement the displacement 45 */ 46 public SPARCAddress(Register base, int displacement) { 47 this.base = base; 48 this.index = Register.None; 49 this.displacement = displacement; 50 } 51 52 /** 53 * Creates an {@link SPARCAddress} with given base register, no scaling and a given index. 54 * 55 * @param base the base register 56 * @param index the index register 57 */ 58 public SPARCAddress(Register base, Register index) { 59 this.base = base; 60 this.index = index; 61 this.displacement = 0; 62 } 63 64 @Override 65 public String toString() { 66 StringBuilder s = new StringBuilder(); 67 s.append("["); 68 String sep = ""; 69 if (!getBase().equals(Register.None)) { 70 s.append(getBase()); 71 sep = " + "; 72 } 73 if (!getIndex().equals(Register.None)) { 74 s.append(sep).append(getIndex()); 75 sep = " + "; 76 } else { 77 if (getDisplacement() < 0) { 78 s.append(" - ").append(-getDisplacement()); 79 } else if (getDisplacement() > 0) { 80 s.append(sep).append(getDisplacement()); 81 } 82 } 83 s.append("]"); 84 return s.toString(); 85 } 86 87 /** 88 * @return Base register that defines the start of the address computation. If not present, is 89 * denoted by {@link Register#None}. 90 */ 91 public Register getBase() { 92 return base; 93 } 94 95 /** 96 * @return Index register, the value of which is added to {@link #getBase}. If not present, is 97 * denoted by {@link Register#None}. 98 */ 99 public Register getIndex() { 100 return index; 101 } 102 103 /** 104 * @return true if this address has an index register 105 */ 106 public boolean hasIndex() { 107 return !getIndex().equals(Register.None); 108 } 109 110 /** 111 * This method adds the stack-bias to the displacement if the base register is either 112 * {@link SPARC#sp} or {@link SPARC#fp}. 113 * 114 * @return Optional additive displacement. 115 */ 116 public int getDisplacement() { 117 if (hasIndex()) { 118 throw new InternalError("address has index register"); 119 } 120 // TODO Should we also hide the register save area size here? 121 if (getBase().equals(sp) || getBase().equals(fp)) { 122 return displacement + STACK_BIAS; 123 } 124 return displacement; 125 } 126 }