| /* |
| * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.jfr.internal.instrument; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import jdk.internal.org.objectweb.asm.Label; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| import jdk.internal.org.objectweb.asm.commons.LocalVariablesSorter; |
| import jdk.internal.org.objectweb.asm.commons.Remapper; |
| import jdk.internal.org.objectweb.asm.commons.SimpleRemapper; |
| import jdk.internal.org.objectweb.asm.tree.MethodNode; |
| import jdk.jfr.internal.LogLevel; |
| import jdk.jfr.internal.LogTag; |
| import jdk.jfr.internal.Logger; |
| |
| /** |
| * Class responsible for finding the call to inline and inlining it. |
| * |
| * This code is heavily influenced by section 3.2.6 "Inline Method" in |
| * "Using ASM framework to implement common bytecode transformation patterns", |
| * E. Kuleshov, AOSD.07, March 2007, Vancouver, Canada. |
| * http://asm.ow2.org/index.html |
| */ |
| @Deprecated |
| final class JIMethodCallInliner extends LocalVariablesSorter { |
| |
| private final String oldClass; |
| private final String newClass; |
| private final MethodNode inlineTarget; |
| private final List<CatchBlock> blocks = new ArrayList<>(); |
| private boolean inlining; |
| |
| /** |
| * inlineTarget defines the method to inline and also contains the actual |
| * code to inline. |
| * |
| * @param access |
| * @param desc |
| * @param mv |
| * @param inlineTarget |
| * @param oldClass |
| * @param newClass |
| * @param logger |
| */ |
| public JIMethodCallInliner(int access, String desc, MethodVisitor mv, |
| MethodNode inlineTarget, String oldClass, String newClass) { |
| super(Opcodes.ASM5, access, desc, mv); |
| this.oldClass = oldClass; |
| this.newClass = newClass; |
| this.inlineTarget = inlineTarget; |
| |
| Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, "MethodCallInliner: targetMethod=" + newClass + "." |
| + inlineTarget.name + inlineTarget.desc); |
| } |
| |
| @Override |
| public void visitMethodInsn(int opcode, String owner, String name, |
| String desc, boolean itf) { |
| // Now we are looking at method call in the source method |
| if (!shouldBeInlined(owner, name, desc)) { |
| // If this method call should not be inlined, just keep it |
| mv.visitMethodInsn(opcode, owner, name, desc, itf); |
| return; |
| } |
| // If the call should be inlined, we create a MethodInliningAdapter |
| // The MIA will walk the instructions in the inlineTarget and add them |
| // to the current method, doing the necessary name remappings. |
| Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, "Inlining call to " + name + desc); |
| Remapper remapper = new SimpleRemapper(oldClass, newClass); |
| Label end = new Label(); |
| inlining = true; |
| inlineTarget.instructions.resetLabels(); |
| JIMethodInliningAdapter mia = new JIMethodInliningAdapter(this, end, |
| opcode == Opcodes.INVOKESTATIC ? Opcodes.ACC_STATIC : 0, desc, |
| remapper); |
| inlineTarget.accept(mia); |
| inlining = false; |
| super.visitLabel(end); |
| } |
| |
| /** |
| * Determine if the method should be inlined or not. |
| */ |
| private boolean shouldBeInlined(String owner, String name, String desc) { |
| return inlineTarget.desc.equals(desc) && inlineTarget.name.equals(name) |
| && owner.equals(newClass.replace('.', '/')); |
| } |
| |
| @Override |
| public void visitTryCatchBlock(Label start, Label end, Label handler, |
| String type) { |
| if (!inlining) { |
| // try-catch blocks are saved here and replayed at the end |
| // of the method (in visitMaxs) |
| blocks.add(new CatchBlock(start, end, handler, type)); |
| } else { |
| super.visitTryCatchBlock(start, end, handler, type); |
| } |
| } |
| |
| @Override |
| public void visitMaxs(int stack, int locals) { |
| for (CatchBlock b : blocks) { |
| super.visitTryCatchBlock(b.start, b.end, b.handler, b.type); |
| } |
| super.visitMaxs(stack, locals); |
| } |
| |
| static final class CatchBlock { |
| |
| final Label start; |
| final Label end; |
| final Label handler; |
| final String type; |
| |
| CatchBlock(Label start, Label end, Label handler, String type) { |
| this.start = start; |
| this.end = end; |
| this.handler = handler; |
| this.type = type; |
| } |
| } |
| } |