--- /dev/null 2018-06-17 23:18:20.806999507 +0800 +++ new/src/share/classes/jdk/jfr/internal/instrument/JIMethodCallInliner.java 2019-01-29 11:00:07.913728263 +0800 @@ -0,0 +1,149 @@ +/* + * Copyright (c) 2013, 2019, 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 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; + } + } +}