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 BytecodeLoad extends BytecodeLoadStore { BytecodeLoad(Method method, int bci)31 BytecodeLoad(Method method, int bci) { 32 super(method, bci); 33 } 34 verify()35 public void verify() { 36 if (Assert.ASSERTS_ENABLED) { 37 Assert.that(isValid(), "check load"); 38 } 39 } 40 isValid()41 public boolean isValid() { 42 int jcode = javaCode(); 43 switch (jcode) { 44 case Bytecodes._iload: 45 case Bytecodes._lload: 46 case Bytecodes._fload: 47 case Bytecodes._dload: 48 case Bytecodes._aload: 49 return true; 50 default: 51 return false; 52 } 53 } 54 at(Method method, int bci)55 public static BytecodeLoad at(Method method, int bci) { 56 BytecodeLoad b = new BytecodeLoad(method, bci); 57 if (Assert.ASSERTS_ENABLED) { 58 b.verify(); 59 } 60 return b; 61 } 62 63 /** Like at, but returns null if the BCI is not at load */ atCheck(Method method, int bci)64 public static BytecodeLoad atCheck(Method method, int bci) { 65 BytecodeLoad b = new BytecodeLoad(method, bci); 66 return (b.isValid() ? b : null); 67 } 68 at(BytecodeStream bcs)69 public static BytecodeLoad at(BytecodeStream bcs) { 70 return new BytecodeLoad(bcs.method(), bcs.bci()); 71 } 72 } 73