1 /* 2 * Copyright (c) 2012, 2019, 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 static jdk.internal.org.objectweb.asm.Opcodes.ACONST_NULL; 29 import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD; 30 import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESTATIC; 31 import static jdk.internal.org.objectweb.asm.Opcodes.RETURN; 32 import jdk.internal.org.objectweb.asm.MethodVisitor; 33 import jdk.internal.org.objectweb.asm.Opcodes; 34 35 final class ConstructorWriter extends MethodVisitor { 36 37 private boolean useInputParameter; 38 private String shortClassName; 39 private String fullClassName; 40 41 ConstructorWriter(Class<?> classToChange, boolean useInputParameter) { 42 super(Opcodes.ASM5); 43 this.useInputParameter = useInputParameter; 44 shortClassName = classToChange.getSimpleName(); 45 fullClassName = classToChange.getName().replace('.', '/'); 46 } 47 48 @Override 49 public void visitInsn(int opcode) 50 { 51 if (opcode == RETURN) { 52 if (useInputParameter) { 53 useInput(); 54 } else { 55 noInput(); 56 } 57 } 58 mv.visitInsn(opcode); 59 } 60 @SuppressWarnings("deprecation") 61 private void useInput() 62 { 63 //Load 'this' from local variable 0 64 //Load first input parameter 65 //Invoke ThrowableTracer.traceCLASS(this, parameter) for current class 66 mv.visitVarInsn(ALOAD, 0); 67 mv.visitVarInsn(ALOAD, 1); 68 mv.visitMethodInsn(INVOKESTATIC, "jdk/jfr/internal/instrument/ThrowableTracer", 69 "trace" + shortClassName, "(L" + fullClassName + 70 ";Ljava/lang/String;)V"); 71 } 72 73 @SuppressWarnings("deprecation") 74 private void noInput() 75 { 76 //Load 'this' from local variable 0 77 //Load "" 78 //Invoke ThrowableTracer.traceCLASS(this, "") for current class 79 mv.visitVarInsn(ALOAD, 0); 80 mv.visitInsn(ACONST_NULL); 81 mv.visitMethodInsn(INVOKESTATIC, "jdk/jfr/internal/instrument/ThrowableTracer", 82 "trace" + shortClassName, "(L" + fullClassName + 83 ";Ljava/lang/String;)V"); 84 } 85 86 public void setMethodVisitor(MethodVisitor mv) { 87 this.mv = mv; 88 } 89 }