1 /* 2 * Copyright (c) 2002, 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 BytecodeIf extends BytecodeJmp { BytecodeIf(Method method, int bci)31 BytecodeIf(Method method, int bci) { 32 super(method, bci); 33 } 34 getTargetBCI()35 public int getTargetBCI() { 36 return bci() + javaShortAt(1); 37 } 38 verify()39 public void verify() { 40 if (Assert.ASSERTS_ENABLED) { 41 Assert.that(isValid(), "check if"); 42 } 43 } 44 isValid()45 public boolean isValid() { 46 int jcode = javaCode(); 47 return (jcode >= Bytecodes._ifeq && jcode <= Bytecodes._if_acmpne) || 48 jcode == Bytecodes._ifnull || jcode == Bytecodes._ifnonnull; 49 } 50 at(Method method, int bci)51 public static BytecodeIf at(Method method, int bci) { 52 BytecodeIf b = new BytecodeIf(method, bci); 53 if (Assert.ASSERTS_ENABLED) { 54 b.verify(); 55 } 56 return b; 57 } 58 59 /** Like at, but returns null if the BCI is not at some ifxxx bytecode */ atCheck(Method method, int bci)60 public static BytecodeIf atCheck(Method method, int bci) { 61 BytecodeIf b = new BytecodeIf(method, bci); 62 return (b.isValid() ? b : null); 63 } 64 at(BytecodeStream bcs)65 public static BytecodeIf at(BytecodeStream bcs) { 66 return new BytecodeIf(bcs.method(), bcs.bci()); 67 } 68 } 69