| /* |
| * Copyright (c) 2016, 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; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.PrintWriter; |
| import java.util.List; |
| |
| import jdk.internal.org.objectweb.asm.ClassReader; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| import jdk.internal.org.objectweb.asm.Type; |
| import jdk.internal.org.objectweb.asm.commons.Method; |
| import jdk.internal.org.objectweb.asm.util.TraceClassVisitor; |
| import jdk.jfr.ValueDescriptor; |
| import jdk.jfr.internal.EventInstrumentation.FieldInfo; |
| |
| final class ASMToolkit { |
| private static Type TYPE_STRING = Type.getType(String.class); |
| private static Type Type_THREAD = Type.getType(Thread.class); |
| private static Type TYPE_CLASS = Type.getType(Class.class); |
| |
| public static void invokeSpecial(MethodVisitor methodVisitor, String className, Method m) { |
| methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, className, m.getName(), m.getDescriptor(), false); |
| } |
| |
| public static void invokeStatic(MethodVisitor methodVisitor, String className, Method m) { |
| methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC, className, m.getName(), m.getDescriptor(), false); |
| } |
| |
| public static void invokeVirtual(MethodVisitor methodVisitor, String className, Method m) { |
| methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, className, m.getName(), m.getDescriptor(), false); |
| } |
| |
| |
| public static Type toType(ValueDescriptor v) { |
| String typeName = v.getTypeName(); |
| |
| switch (typeName) { |
| case "byte": |
| return Type.BYTE_TYPE; |
| case "short": |
| return Type.SHORT_TYPE; |
| case "int": |
| return Type.INT_TYPE; |
| case "long": |
| return Type.LONG_TYPE; |
| case "double": |
| return Type.DOUBLE_TYPE; |
| case "float": |
| return Type.FLOAT_TYPE; |
| case "char": |
| return Type.CHAR_TYPE; |
| case "boolean": |
| return Type.BOOLEAN_TYPE; |
| case "java.lang.String": |
| return TYPE_STRING; |
| case "java.lang.Thread": |
| return Type_THREAD; |
| case "java.lang.Class": |
| return TYPE_CLASS; |
| } |
| // Add support for SettingControl? |
| throw new Error("Not a valid type " + v.getTypeName()); |
| } |
| |
| /** |
| * Converts "int" into "I" and "java.lang.String" into "Ljava/lang/String;" |
| * |
| * @param typeName |
| * type |
| * |
| * @return descriptor |
| */ |
| public static String getDescriptor(String typeName) { |
| if ("int".equals(typeName)) { |
| return "I"; |
| } |
| if ("long".equals(typeName)) { |
| return "J"; |
| } |
| if ("boolean".equals(typeName)) { |
| return "Z"; |
| } |
| if ("float".equals(typeName)) { |
| return "F"; |
| } |
| if ("double".equals(typeName)) { |
| return "D"; |
| } |
| if ("short".equals(typeName)) { |
| return "S"; |
| } |
| if ("char".equals(typeName)) { |
| return "C"; |
| } |
| if ("byte".equals(typeName)) { |
| return "B"; |
| } |
| String internal = getInternalName(typeName); |
| return Type.getObjectType(internal).getDescriptor(); |
| } |
| |
| /** |
| * Converts java.lang.String into java/lang/String |
| * |
| * @param className |
| * |
| * @return internal name |
| */ |
| public static String getInternalName(String className) { |
| return className.replace(".", "/"); |
| } |
| |
| public static Method makeWriteMethod(List<FieldInfo> fields) { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("("); |
| for (FieldInfo v : fields) { |
| if (!v.fieldName.equals(EventInstrumentation.FIELD_EVENT_THREAD) && !v.fieldName.equals(EventInstrumentation.FIELD_STACK_TRACE)) { |
| sb.append(v.fieldDescriptor); |
| } |
| } |
| sb.append(")V"); |
| return new Method("write", sb.toString()); |
| } |
| |
| public static void logASM(String className, byte[] bytes) { |
| Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.INFO, "Generated bytecode for class " + className); |
| Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.TRACE, () -> { |
| ClassReader cr = new ClassReader(bytes); |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| PrintWriter w = new PrintWriter(baos); |
| w.println("Bytecode:"); |
| cr.accept(new TraceClassVisitor(w), 0); |
| return baos.toString(); |
| }); |
| } |
| |
| } |