1 /* 2 * Copyright (c) 2001, 2004, 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.interpreter; 26 27 import sun.jvm.hotspot.oops.*; 28 import sun.jvm.hotspot.utilities.*; 29 30 public class Bytecode { 31 Method method; 32 int bci; 33 static final int jintSize = 4; 34 static final String spaces = " "; 35 static final String comma = ", "; 36 37 Bytecode(Method method, int bci) { 38 this.method = method; 39 this.bci = bci; 40 } 41 42 // Address computation 43 // NOTE: assumes that the start of the method's bytecodes is 4-byte aligned 44 int alignedOffset(int offset) { 45 return Bits.roundTo(bci + offset, jintSize) - bci; 46 } 47 48 int javaSignedWordAt(int offset) { 49 return method.getBytecodeIntArg(bci + offset); 50 } 51 52 short javaShortAt(int offset) { 53 return method.getBytecodeShortArg(bci + offset); 54 } 55 56 byte javaByteAt(int offset) { 57 return method.getBytecodeByteArg(bci + offset); 58 } 59 60 public Method method() { return method; } 61 public int bci() { return bci; } 62 63 // hotspot byte code 64 public int code() { 65 return Bytecodes.codeAt(method(), bci()); 66 } 67 68 // jvm byte code 69 public int javaCode() { 70 return Bytecodes.javaCode(code()); 71 } 72 73 public String getBytecodeName() { 74 return Bytecodes.name(code()); 75 } 76 77 public String getJavaBytecodeName() { 78 return Bytecodes.name(javaCode()); 79 } 80 81 public int getLength() { 82 return Bytecodes.lengthAt(method(), bci()); 83 } 84 85 public int getJavaLength() { 86 return Bytecodes.javaLengthAt(method(), bci()); 87 } 88 89 public String toString() { 90 StringBuffer buf = new StringBuffer(getJavaBytecodeName()); 91 if (code() != javaCode()) { 92 buf.append(spaces); 93 buf.append('['); 94 buf.append(getBytecodeName()); 95 buf.append(']'); 96 } 97 return buf.toString(); 98 } 99 }