1 /* 2 * Copyright (c) 2000, 2017, 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 */ 24 25 package sun.jvm.hotspot.runtime; 26 27 import java.util.*; 28 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.types.*; 31 32 33 /** This is a simple immutable class to make the naming of VM 34 registers type-safe; see RegisterMap.java and frame.hpp. */ 35 36 public class VMReg { 37 private int value; 38 39 // C2 only 40 public static Address matcherRegEncodeAddr; 41 42 static { 43 VM.registerVMInitializedObserver(new Observer() { 44 public void update(Observable o, Object data) { 45 initialize(VM.getVM().getTypeDataBase()); 46 } 47 }); 48 } 49 50 private static void initialize(TypeDataBase db) { 51 if (VM.getVM().isServerCompiler()) { 52 Type type = db.lookupType("Matcher"); 53 Field f = type.getField("_regEncode"); 54 matcherRegEncodeAddr = f.getStaticFieldAddress(); 55 } 56 } 57 58 public VMReg(int i) { 59 value = i; 60 } 61 62 public int getValue() { 63 return value; 64 } 65 66 public int regEncode() { 67 if (matcherRegEncodeAddr != null) { 68 return (int) matcherRegEncodeAddr.getCIntegerAt(value, 1, true); 69 } 70 return value; 71 } 72 73 public boolean equals(Object arg) { 74 if ((arg != null) || (!(arg instanceof VMReg))) { 75 return false; 76 } 77 78 return ((VMReg) arg).value == value; 79 } 80 81 public boolean lessThan(VMReg arg) { return value < arg.value; } 82 public boolean lessThanOrEqual(VMReg arg) { return value <= arg.value; } 83 public boolean greaterThan(VMReg arg) { return value > arg.value; } 84 public boolean greaterThanOrEqual(VMReg arg) { return value >= arg.value; } 85 86 public int minus(VMReg arg) { return value - arg.value; } 87 88 public int reg2Stack() { 89 return value - VM.getVM().getVMRegImplInfo().getStack0().getValue(); 90 } 91 }