author | mchung |
Thu, 04 Oct 2018 08:45:21 -0700 | |
changeset 52015 | 821bfc24d750 |
parent 50113 | caf115bb98ad |
child 52334 | a181612f0715 |
permissions | -rw-r--r-- |
50113 | 1 |
/* |
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.jfr.internal; |
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import java.lang.reflect.Constructor; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.InvocationTargetException; |
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import java.lang.reflect.Modifier; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.StringJoiner; |
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import jdk.internal.org.objectweb.asm.ClassWriter; |
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import jdk.internal.org.objectweb.asm.Label; |
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import jdk.internal.org.objectweb.asm.MethodVisitor; |
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import jdk.internal.org.objectweb.asm.Opcodes; |
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import jdk.internal.org.objectweb.asm.Type; |
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import jdk.internal.org.objectweb.asm.commons.Method; |
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import jdk.jfr.Event; |
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import jdk.jfr.EventType; |
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import jdk.jfr.SettingControl; |
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import jdk.jfr.ValueDescriptor; |
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import jdk.jfr.internal.EventInstrumentation.FieldInfo; |
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import jdk.jfr.internal.EventInstrumentation.SettingInfo; |
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import jdk.jfr.internal.handlers.EventHandler; |
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final class EventHandlerCreator { |
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// TODO: |
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// How can we find out class version without loading a |
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// class as resource in a privileged block and use ASM to inspect |
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// the contents. Using '52' even though we know later versions |
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// are available. The reason for this is compatibility aspects |
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// with for example WLS. |
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private static final int CLASS_VERSION = 52; |
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// This is needed so a new EventHandler is automatically generated in MetadataRespoistory |
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// if a user Event class is loaded using APPCDS/CDS. |
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private static final String SUFFIX = "_" + System.currentTimeMillis() + "-" + JVM.getJVM().getPid(); |
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private static final String FIELD_EVENT_TYPE = "platformEventType"; |
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private static final String FIELD_PREFIX_STRING_POOL = "stringPool"; |
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private final static Type TYPE_STRING_POOL = Type.getType(StringPool.class); |
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private final static Type TYPE_EVENT_WRITER = Type.getType(EventWriter.class); |
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private final static Type TYPE_PLATFORM_EVENT_TYPE = Type.getType(PlatformEventType.class); |
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private final static Type TYPE_EVENT_HANDLER = Type.getType(EventHandler.class); |
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private final static Type TYPE_SETTING_CONTROL = Type.getType(SettingControl.class); |
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private final static Type TYPE_EVENT_TYPE = Type.getType(EventType.class); |
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private final static Type TYPE_EVENT_CONTROL = Type.getType(EventControl.class); |
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private final static String DESCRIPTOR_EVENT_HANDLER = "(" + Type.BOOLEAN_TYPE.getDescriptor() + TYPE_EVENT_TYPE.getDescriptor() + TYPE_EVENT_CONTROL.getDescriptor() + ")V"; |
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private final static Method METHOD_GET_EVENT_WRITER = new Method("getEventWriter", "()" + TYPE_EVENT_WRITER.getDescriptor()); |
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private final static Method METHOD_EVENT_HANDLER_CONSTRUCTOR = new Method("<init>", DESCRIPTOR_EVENT_HANDLER); |
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private final static Method METHOD_RESET = new Method("reset", "()V"); |
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private final ClassWriter classWriter; |
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private final String className; |
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private final String internalClassName; |
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private final List<SettingInfo> settingInfos; |
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private final List<FieldInfo> fields; |
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public EventHandlerCreator(long id, List<SettingInfo> settingInfos, List<FieldInfo> fields) { |
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this.classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); |
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this.className = makeEventHandlerName(id); |
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this.internalClassName = ASMToolkit.getInternalName(className); |
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this.settingInfos = settingInfos; |
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this.fields = fields; |
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} |
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public static String makeEventHandlerName(long id) { |
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return EventHandler.class.getName() + id + SUFFIX; |
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} |
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public EventHandlerCreator(long id, List<SettingInfo> settingInfos, EventType type, Class<? extends Event> eventClass) { |
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this(id, settingInfos, createFieldInfos(eventClass, type)); |
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} |
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private static List<FieldInfo> createFieldInfos(Class<? extends Event> eventClass, EventType type) throws Error { |
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List<FieldInfo> fieldInfos = new ArrayList<>(); |
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for (ValueDescriptor v : type.getFields()) { |
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// Only value descriptors that are not fields on the event class. |
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if (v != TypeLibrary.STACK_TRACE_FIELD && v != TypeLibrary.THREAD_FIELD) { |
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String fieldName = PrivateAccess.getInstance().getFieldName(v); |
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String fieldDescriptor = ASMToolkit.getDescriptor(v.getTypeName()); |
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Class<?> c = eventClass; |
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String internalName = null; |
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while (c != Event.class) { |
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try { |
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Field field = c.getDeclaredField(fieldName); |
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if (c == eventClass || !Modifier.isPrivate(field.getModifiers())) { |
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internalName = ASMToolkit.getInternalName(c.getName()); |
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break; |
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} |
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} catch (NoSuchFieldException | SecurityException e) { |
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// ignore |
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} |
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c = c.getSuperclass(); |
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} |
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if (internalName != null) { |
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fieldInfos.add(new FieldInfo(fieldName, fieldDescriptor, internalName)); |
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} else { |
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throw new InternalError("Could not locate field " + fieldName + " for event type" + type.getName()); |
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} |
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} |
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} |
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return fieldInfos; |
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} |
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public Class<? extends EventHandler> makeEventHandlerClass() { |
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buildClassInfo(); |
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buildConstructor(); |
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buildWriteMethod(); |
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byte[] bytes = classWriter.toByteArray(); |
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ASMToolkit.logASM(className, bytes); |
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52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
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return SecuritySupport.defineClass(EventHandler.class, bytes).asSubclass(EventHandler.class); |
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} |
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public static EventHandler instantiateEventHandler(Class<? extends EventHandler> handlerClass, boolean registered, EventType eventType, EventControl eventControl) throws Error { |
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final Constructor<?> cc; |
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try { |
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cc = handlerClass.getDeclaredConstructors()[0]; |
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} catch (Exception e) { |
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throw (Error) new InternalError("Could not get handler constructor for " + eventType.getName()).initCause(e); |
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} |
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// Users should not be allowed to create instances of the event handler |
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// so we need to unlock it here. |
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SecuritySupport.setAccessible(cc); |
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try { |
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List<SettingInfo> settingInfos = eventControl.getSettingInfos(); |
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Object[] arguments = new Object[3 + settingInfos.size()]; |
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arguments[0] = registered; |
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arguments[1] = eventType; |
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arguments[2] = eventControl; |
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for (SettingInfo si : settingInfos) { |
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arguments[si.index + 3] = si.settingControl; |
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} |
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return (EventHandler) cc.newInstance(arguments); |
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} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { |
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throw (Error) new InternalError("Could not instantiate event handler for " + eventType.getName() + ". " + e.getMessage()).initCause(e); |
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} |
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} |
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private void buildConstructor() { |
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MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PRIVATE, METHOD_EVENT_HANDLER_CONSTRUCTOR.getName(), makeConstructorDescriptor(settingInfos), null, null); |
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mv.visitVarInsn(Opcodes.ALOAD, 0); // this |
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mv.visitVarInsn(Opcodes.ILOAD, 1); // registered |
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mv.visitVarInsn(Opcodes.ALOAD, 2); // event type |
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mv.visitVarInsn(Opcodes.ALOAD, 3); // event control |
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mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(EventHandler.class), METHOD_EVENT_HANDLER_CONSTRUCTOR.getName(), METHOD_EVENT_HANDLER_CONSTRUCTOR.getDescriptor(), false); |
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for (SettingInfo si : settingInfos) { |
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mv.visitVarInsn(Opcodes.ALOAD, 0); // this |
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mv.visitVarInsn(Opcodes.ALOAD, si.index + 4); // Setting Control |
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mv.visitFieldInsn(Opcodes.PUTFIELD, internalClassName, si.fieldName, TYPE_SETTING_CONTROL.getDescriptor()); |
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} |
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// initialized string field writers |
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int fieldIndex = 0; |
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for (FieldInfo field : fields) { |
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if (field.isString()) { |
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mv.visitVarInsn(Opcodes.ALOAD, 0); |
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mv.visitVarInsn(Opcodes.ALOAD, 0); |
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mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(EventHandler.class), "createStringFieldWriter", "()" + TYPE_STRING_POOL.getDescriptor(), false); |
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mv.visitFieldInsn(Opcodes.PUTFIELD, internalClassName, FIELD_PREFIX_STRING_POOL + fieldIndex, TYPE_STRING_POOL.getDescriptor()); |
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} |
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fieldIndex++; |
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} |
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mv.visitInsn(Opcodes.RETURN); |
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mv.visitMaxs(0, 0); |
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mv.visitEnd(); |
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} |
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private void buildClassInfo() { |
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String internalSuperName = ASMToolkit.getInternalName(EventHandler.class.getName()); |
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classWriter.visit(CLASS_VERSION, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, internalClassName, null, internalSuperName, null); |
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for (SettingInfo si : settingInfos) { |
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classWriter.visitField(Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL, si.fieldName, TYPE_SETTING_CONTROL.getDescriptor(), null, null); |
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} |
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int fieldIndex = 0; |
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for (FieldInfo field : fields) { |
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if (field.isString()) { |
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classWriter.visitField(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, FIELD_PREFIX_STRING_POOL+ fieldIndex, TYPE_STRING_POOL.getDescriptor(), null, null); |
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} |
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fieldIndex++; |
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} |
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} |
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private void visitMethod(final MethodVisitor mv, final int opcode, final Type type, final Method method) { |
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mv.visitMethodInsn(opcode, type.getInternalName(), method.getName(), method.getDescriptor(), false); |
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} |
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private void buildWriteMethod() { |
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int argIndex = 0; // // indexes the argument type array, the argument type array does not include 'this' |
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int slotIndex = 1; // indexes the proper slot in the local variable table, takes type size into account, therefore sometimes argIndex != slotIndex |
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int fieldIndex = 0; |
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Method desc = ASMToolkit.makeWriteMethod(fields); |
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Type[] argumentTypes = Type.getArgumentTypes(desc.getDescriptor()); |
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MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PUBLIC, desc.getName(), desc.getDescriptor(), null, null); |
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mv.visitCode(); |
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Label start = new Label(); |
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Label endTryBlock = new Label(); |
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Label exceptionHandler = new Label(); |
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mv.visitTryCatchBlock(start, endTryBlock, exceptionHandler, "java/lang/Throwable"); |
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mv.visitLabel(start); |
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visitMethod(mv, Opcodes.INVOKESTATIC, TYPE_EVENT_WRITER, METHOD_GET_EVENT_WRITER); |
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// stack: [BW] |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [BW], [BW] |
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// write begin event |
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mv.visitVarInsn(Opcodes.ALOAD, 0); |
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// stack: [BW], [BW], [this] |
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mv.visitFieldInsn(Opcodes.GETFIELD, TYPE_EVENT_HANDLER.getInternalName(), FIELD_EVENT_TYPE, TYPE_PLATFORM_EVENT_TYPE.getDescriptor()); |
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// stack: [BW], [BW], [BS] |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, EventWriterMethod.BEGIN_EVENT.asASM()); |
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// stack: [BW], [integer] |
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Label recursive = new Label(); |
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mv.visitJumpInsn(Opcodes.IFEQ, recursive); |
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// stack: [BW] |
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// write startTime |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [BW], [BW] |
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mv.visitVarInsn(argumentTypes[argIndex].getOpcode(Opcodes.ILOAD), slotIndex); |
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// stack: [BW], [BW], [long] |
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slotIndex += argumentTypes[argIndex++].getSize(); |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, EventWriterMethod.PUT_LONG.asASM()); |
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// stack: [BW] |
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fieldIndex++; |
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// write duration |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [BW], [BW] |
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mv.visitVarInsn(argumentTypes[argIndex].getOpcode(Opcodes.ILOAD), slotIndex); |
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// stack: [BW], [BW], [long] |
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slotIndex += argumentTypes[argIndex++].getSize(); |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, EventWriterMethod.PUT_LONG.asASM()); |
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// stack: [BW] |
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fieldIndex++; |
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// write eventThread |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [BW], [BW] |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, EventWriterMethod.PUT_EVENT_THREAD.asASM()); |
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// stack: [BW] |
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// write stackTrace |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [BW], [BW] |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, EventWriterMethod.PUT_STACK_TRACE.asASM()); |
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// stack: [BW] |
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// write custom fields |
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while (fieldIndex < fields.size()) { |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [BW], [BW] |
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mv.visitVarInsn(argumentTypes[argIndex].getOpcode(Opcodes.ILOAD), slotIndex); |
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// stack:[BW], [BW], [field] |
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slotIndex += argumentTypes[argIndex++].getSize(); |
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FieldInfo field = fields.get(fieldIndex); |
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if (field.isString()) { |
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mv.visitVarInsn(Opcodes.ALOAD, 0); |
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// stack:[BW], [BW], [field], [this] |
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mv.visitFieldInsn(Opcodes.GETFIELD, this.internalClassName, FIELD_PREFIX_STRING_POOL + fieldIndex, TYPE_STRING_POOL.getDescriptor()); |
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// stack:[BW], [BW], [field], [string] |
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} |
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EventWriterMethod eventMethod = EventWriterMethod.lookupMethod(field); |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, eventMethod.asASM()); |
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// stack: [BW] |
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fieldIndex++; |
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} |
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// stack: [BW] |
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// write end event (writer already on stack) |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, EventWriterMethod.END_EVENT.asASM()); |
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// stack [integer] |
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// notified -> restart event write attempt |
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mv.visitJumpInsn(Opcodes.IFEQ, start); |
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// stack: |
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mv.visitLabel(endTryBlock); |
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Label end = new Label(); |
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mv.visitJumpInsn(Opcodes.GOTO, end); |
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296 |
mv.visitLabel(exceptionHandler); |
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297 |
// stack: [ex] |
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298 |
mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] {"java/lang/Throwable"}); |
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visitMethod(mv, Opcodes.INVOKESTATIC, TYPE_EVENT_WRITER, METHOD_GET_EVENT_WRITER); |
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// stack: [ex] [BW] |
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mv.visitInsn(Opcodes.DUP); |
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// stack: [ex] [BW] [BW] |
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Label rethrow = new Label(); |
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mv.visitJumpInsn(Opcodes.IFNULL, rethrow); |
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305 |
// stack: [ex] [BW] |
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306 |
mv.visitInsn(Opcodes.DUP); |
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307 |
// stack: [ex] [BW] [BW] |
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visitMethod(mv, Opcodes.INVOKEVIRTUAL, TYPE_EVENT_WRITER, METHOD_RESET); |
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309 |
mv.visitLabel(rethrow); |
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310 |
// stack:[ex] [BW] |
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311 |
mv.visitFrame(Opcodes.F_SAME, 0, null, 2, new Object[] {"java/lang/Throwable", TYPE_EVENT_WRITER.getInternalName()}); |
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312 |
mv.visitInsn(Opcodes.POP); |
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313 |
// stack:[ex] |
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314 |
mv.visitInsn(Opcodes.ATHROW); |
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315 |
mv.visitLabel(recursive); |
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316 |
// stack: [BW] |
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317 |
mv.visitFrame(Opcodes.F_SAME, 0, null, 1, new Object[] { TYPE_EVENT_WRITER.getInternalName()} ); |
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318 |
mv.visitInsn(Opcodes.POP); |
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319 |
mv.visitLabel(end); |
|
320 |
// stack: |
|
321 |
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null); |
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322 |
mv.visitInsn(Opcodes.RETURN); |
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323 |
mv.visitMaxs(0, 0); |
|
324 |
mv.visitEnd(); |
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325 |
} |
|
326 |
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327 |
private static String makeConstructorDescriptor(List<SettingInfo> settingsInfos) { |
|
328 |
StringJoiner constructordescriptor = new StringJoiner("", "(", ")V"); |
|
329 |
constructordescriptor.add(Type.BOOLEAN_TYPE.getDescriptor()); |
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330 |
constructordescriptor.add(Type.getType(EventType.class).getDescriptor()); |
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331 |
constructordescriptor.add(Type.getType(EventControl.class).getDescriptor()); |
|
332 |
for (int i = 0; i < settingsInfos.size(); i++) { |
|
333 |
constructordescriptor.add(TYPE_SETTING_CONTROL.getDescriptor()); |
|
334 |
} |
|
335 |
return constructordescriptor.toString(); |
|
336 |
} |
|
337 |
} |