1 /* 2 * Copyright (c) 2013, 2018, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.internal.instrument; 27 28 import java.util.ArrayList; 29 import java.util.List; 30 31 import jdk.internal.org.objectweb.asm.Label; 32 import jdk.internal.org.objectweb.asm.MethodVisitor; 33 import jdk.internal.org.objectweb.asm.Opcodes; 34 import jdk.internal.org.objectweb.asm.commons.LocalVariablesSorter; 35 import jdk.internal.org.objectweb.asm.commons.Remapper; 36 import jdk.internal.org.objectweb.asm.commons.SimpleRemapper; 37 import jdk.internal.org.objectweb.asm.tree.MethodNode; 38 import jdk.jfr.internal.LogLevel; 39 import jdk.jfr.internal.LogTag; 40 import jdk.jfr.internal.Logger; 41 42 /** 43 * Class responsible for finding the call to inline and inlining it. 44 * 45 * This code is heavily influenced by section 3.2.6 "Inline Method" in 46 * "Using ASM framework to implement common bytecode transformation patterns", 47 * E. Kuleshov, AOSD.07, March 2007, Vancouver, Canada. 48 * http://asm.ow2.org/index.html 49 */ 50 @Deprecated 51 final class JIMethodCallInliner extends LocalVariablesSorter { 52 53 private final String oldClass; 54 private final String newClass; 55 private final MethodNode inlineTarget; 56 private final List<CatchBlock> blocks = new ArrayList<>(); 57 private boolean inlining; 58 59 /** 60 * inlineTarget defines the method to inline and also contains the actual 61 * code to inline. 62 * 63 * @param access 64 * @param desc 65 * @param mv 66 * @param inlineTarget 67 * @param oldClass 68 * @param newClass 69 * @param logger 70 */ JIMethodCallInliner(int access, String desc, MethodVisitor mv, MethodNode inlineTarget, String oldClass, String newClass)71 public JIMethodCallInliner(int access, String desc, MethodVisitor mv, 72 MethodNode inlineTarget, String oldClass, String newClass) { 73 super(Opcodes.ASM7, access, desc, mv); 74 this.oldClass = oldClass; 75 this.newClass = newClass; 76 this.inlineTarget = inlineTarget; 77 78 if (Logger.shouldLog(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG)) { 79 Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, 80 "MethodCallInliner: targetMethod=" + newClass + "." 81 + inlineTarget.name + inlineTarget.desc); 82 } 83 } 84 85 @Override visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf)86 public void visitMethodInsn(int opcode, String owner, String name, 87 String desc, boolean itf) { 88 // Now we are looking at method call in the source method 89 if (!shouldBeInlined(owner, name, desc)) { 90 // If this method call should not be inlined, just keep it 91 mv.visitMethodInsn(opcode, owner, name, desc, itf); 92 return; 93 } 94 // If the call should be inlined, we create a MethodInliningAdapter 95 // The MIA will walk the instructions in the inlineTarget and add them 96 // to the current method, doing the necessary name remappings. 97 Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, "Inlining call to " + name + desc); 98 Remapper remapper = new SimpleRemapper(oldClass, newClass); 99 Label end = new Label(); 100 inlining = true; 101 inlineTarget.instructions.resetLabels(); 102 JIMethodInliningAdapter mia = new JIMethodInliningAdapter(this, end, 103 opcode == Opcodes.INVOKESTATIC ? Opcodes.ACC_STATIC : 0, desc, 104 remapper); 105 inlineTarget.accept(mia); 106 inlining = false; 107 super.visitLabel(end); 108 } 109 110 /** 111 * Determine if the method should be inlined or not. 112 */ shouldBeInlined(String owner, String name, String desc)113 private boolean shouldBeInlined(String owner, String name, String desc) { 114 return inlineTarget.desc.equals(desc) && inlineTarget.name.equals(name) 115 && owner.equals(newClass.replace('.', '/')); 116 } 117 118 @Override visitTryCatchBlock(Label start, Label end, Label handler, String type)119 public void visitTryCatchBlock(Label start, Label end, Label handler, 120 String type) { 121 if (!inlining) { 122 // try-catch blocks are saved here and replayed at the end 123 // of the method (in visitMaxs) 124 blocks.add(new CatchBlock(start, end, handler, type)); 125 } else { 126 super.visitTryCatchBlock(start, end, handler, type); 127 } 128 } 129 130 @Override visitMaxs(int stack, int locals)131 public void visitMaxs(int stack, int locals) { 132 for (CatchBlock b : blocks) { 133 super.visitTryCatchBlock(b.start, b.end, b.handler, b.type); 134 } 135 super.visitMaxs(stack, locals); 136 } 137 138 static final class CatchBlock { 139 140 final Label start; 141 final Label end; 142 final Label handler; 143 final String type; 144 CatchBlock(Label start, Label end, Label handler, String type)145 CatchBlock(Label start, Label end, Label handler, String type) { 146 this.start = start; 147 this.end = end; 148 this.handler = handler; 149 this.type = type; 150 } 151 } 152 } 153