1/* 2 * Copyright (c) 2002, 2003, 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 25package sun.jvm.hotspot.interpreter; 26 27import sun.jvm.hotspot.oops.*; 28import sun.jvm.hotspot.utilities.*; 29 30public class BytecodeRet extends BytecodeWideable { 31 BytecodeRet(Method method, int bci) { 32 super(method, bci); 33 } 34 35 public void verify() { 36 if (Assert.ASSERTS_ENABLED) { 37 Assert.that(isValid(), "check ret"); 38 } 39 } 40 41 public boolean isValid() { 42 return javaCode() == Bytecodes._ret; 43 } 44 45 public static BytecodeRet at(Method method, int bci) { 46 BytecodeRet b = new BytecodeRet(method, bci); 47 if (Assert.ASSERTS_ENABLED) { 48 b.verify(); 49 } 50 return b; 51 } 52 53 /** Like at, but returns null if the BCI is not at ret */ 54 public static BytecodeRet atCheck(Method method, int bci) { 55 BytecodeRet b = new BytecodeRet(method, bci); 56 return (b.isValid() ? b : null); 57 } 58 59 public static BytecodeRet at(BytecodeStream bcs) { 60 return new BytecodeRet(bcs.method(), bcs.bci()); 61 } 62 63 public String toString() { 64 StringBuffer buf = new StringBuffer(); 65 buf.append("ret"); 66 buf.append(spaces); 67 buf.append('#'); 68 buf.append(Integer.toString(getLocalVarIndex())); 69 return buf.toString(); 70 } 71} 72