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Paper/Spigot-API-Patches/0022-Use-ASM-for-event-executors.patch
Shane Freeder 304244232f
Updated Upstream (Bukkit/CraftBukkit/Spigot) 
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
aba2aaaf Correct pom.xml version

CraftBukkit Changes:
e8b39d43 SPIGOT-5103: World.save does not save gamerules
3164e531 Correct pom.xml version

Spigot Changes:
595711b0 Correct pom.xml version
2019-06-25 14:55:44 +01:00

444 Zeilen
18 KiB
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Originalformat Blame Verlauf

From 69ce0886b5a5faff5c6f3b0cd144d74e15e26f62 Mon Sep 17 00:00:00 2001
From: Techcable <Techcable@outlook.com>
Date: Thu, 3 Mar 2016 13:20:33 -0700
Subject: [PATCH] Use ASM for event executors.
Uses method handles for private or static methods.
diff --git a/pom.xml b/pom.xml
index e65cbc15..a1dd0ac2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -129,6 +129,17 @@
<version>7.1</version>
<scope>test</scope>
</dependency>
+ <!-- ASM -->
+ <dependency>
+ <groupId>org.ow2.asm</groupId>
+ <artifactId>asm</artifactId>
+ <version>7.1</version>
+ </dependency>
+ <dependency>
+ <groupId>org.ow2.asm</groupId>
+ <artifactId>asm-commons</artifactId>
+ <version>7.1</version>
+ </dependency>
</dependencies>
<build>
diff --git a/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java b/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java
new file mode 100644
index 00000000..5b28e9b1
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java
@@ -0,0 +1,42 @@
+package com.destroystokyo.paper.event.executor;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+
+import com.destroystokyo.paper.util.SneakyThrow;
+import org.bukkit.event.Event;
+import org.bukkit.event.EventException;
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.EventExecutor;
+import org.jetbrains.annotations.NotNull;
+
+public class MethodHandleEventExecutor implements EventExecutor {
+ private final Class<? extends Event> eventClass;
+ private final MethodHandle handle;
+
+ public MethodHandleEventExecutor(@NotNull Class<? extends Event> eventClass, @NotNull MethodHandle handle) {
+ this.eventClass = eventClass;
+ this.handle = handle;
+ }
+
+ public MethodHandleEventExecutor(@NotNull Class<? extends Event> eventClass, @NotNull Method m) {
+ this.eventClass = eventClass;
+ try {
+ m.setAccessible(true);
+ this.handle = MethodHandles.lookup().unreflect(m);
+ } catch (IllegalAccessException e) {
+ throw new AssertionError("Unable to set accessible", e);
+ }
+ }
+
+ @Override
+ public void execute(@NotNull Listener listener, @NotNull Event event) throws EventException {
+ if (!eventClass.isInstance(event)) return;
+ try {
+ handle.invoke(listener, event);
+ } catch (Throwable t) {
+ SneakyThrow.sneaky(t);
+ }
+ }
+}
diff --git a/src/main/java/com/destroystokyo/paper/event/executor/StaticMethodHandleEventExecutor.java b/src/main/java/com/destroystokyo/paper/event/executor/StaticMethodHandleEventExecutor.java
new file mode 100644
index 00000000..c8367242
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/StaticMethodHandleEventExecutor.java
@@ -0,0 +1,43 @@
+package com.destroystokyo.paper.event.executor;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+import com.destroystokyo.paper.util.SneakyThrow;
+import com.google.common.base.Preconditions;
+
+import org.bukkit.Bukkit;
+import org.bukkit.event.Event;
+import org.bukkit.event.EventException;
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.EventExecutor;
+import org.jetbrains.annotations.NotNull;
+
+public class StaticMethodHandleEventExecutor implements EventExecutor {
+ private final Class<? extends Event> eventClass;
+ private final MethodHandle handle;
+
+ public StaticMethodHandleEventExecutor(@NotNull Class<? extends Event> eventClass, @NotNull Method m) {
+ Preconditions.checkArgument(Modifier.isStatic(m.getModifiers()), "Not a static method: %s", m);
+ Preconditions.checkArgument(eventClass != null, "eventClass is null");
+ this.eventClass = eventClass;
+ try {
+ m.setAccessible(true);
+ this.handle = MethodHandles.lookup().unreflect(m);
+ } catch (IllegalAccessException e) {
+ throw new AssertionError("Unable to set accessible", e);
+ }
+ }
+
+ @Override
+ public void execute(@NotNull Listener listener, @NotNull Event event) throws EventException {
+ if (!eventClass.isInstance(event)) return;
+ try {
+ handle.invoke(event);
+ } catch (Throwable throwable) {
+ SneakyThrow.sneaky(throwable);
+ }
+ }
+}
diff --git a/src/main/java/com/destroystokyo/paper/event/executor/asm/ASMEventExecutorGenerator.java b/src/main/java/com/destroystokyo/paper/event/executor/asm/ASMEventExecutorGenerator.java
new file mode 100644
index 00000000..b6e7d8ee
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/ASMEventExecutorGenerator.java
@@ -0,0 +1,47 @@
+package com.destroystokyo.paper.event.executor.asm;
+
+import java.lang.reflect.Method;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.bukkit.plugin.EventExecutor;
+import org.jetbrains.annotations.NotNull;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Type;
+import org.objectweb.asm.commons.GeneratorAdapter;
+
+import static org.objectweb.asm.Opcodes.*;
+
+public class ASMEventExecutorGenerator {
+ @NotNull
+ public static byte[] generateEventExecutor(@NotNull Method m, @NotNull String name) {
+ ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
+ writer.visit(V1_8, ACC_PUBLIC, name.replace('.', '/'), null, Type.getInternalName(Object.class), new String[] {Type.getInternalName(EventExecutor.class)});
+ // Generate constructor
+ GeneratorAdapter methodGenerator = new GeneratorAdapter(writer.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null), ACC_PUBLIC, "<init>", "()V");
+ methodGenerator.loadThis();
+ methodGenerator.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(Object.class), "<init>", "()V", false); // Invoke the super class (Object) constructor
+ methodGenerator.returnValue();
+ methodGenerator.endMethod();
+ // Generate the execute method
+ methodGenerator = new GeneratorAdapter(writer.visitMethod(ACC_PUBLIC, "execute", "(Lorg/bukkit/event/Listener;Lorg/bukkit/event/Event;)V", null, null), ACC_PUBLIC, "execute", "(Lorg/bukkit/event/Listener;Lorg/bukkit/event/Listener;)V");;
+ methodGenerator.loadArg(0);
+ methodGenerator.checkCast(Type.getType(m.getDeclaringClass()));
+ methodGenerator.loadArg(1);
+ methodGenerator.checkCast(Type.getType(m.getParameterTypes()[0]));
+ methodGenerator.visitMethodInsn(m.getDeclaringClass().isInterface() ? INVOKEINTERFACE : INVOKEVIRTUAL, Type.getInternalName(m.getDeclaringClass()), m.getName(), Type.getMethodDescriptor(m), m.getDeclaringClass().isInterface());
+ if (m.getReturnType() != void.class) {
+ methodGenerator.pop();
+ }
+ methodGenerator.returnValue();
+ methodGenerator.endMethod();
+ writer.visitEnd();
+ return writer.toByteArray();
+ }
+
+ public static AtomicInteger NEXT_ID = new AtomicInteger(1);
+ @NotNull
+ public static String generateName() {
+ int id = NEXT_ID.getAndIncrement();
+ return "com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor" + id;
+ }
+}
diff --git a/src/main/java/com/destroystokyo/paper/event/executor/asm/ClassDefiner.java b/src/main/java/com/destroystokyo/paper/event/executor/asm/ClassDefiner.java
new file mode 100644
index 00000000..beed9e6e
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/ClassDefiner.java
@@ -0,0 +1,35 @@
+package com.destroystokyo.paper.event.executor.asm;
+
+import com.destroystokyo.paper.utils.UnsafeUtils;
+import org.jetbrains.annotations.NotNull;
+
+public interface ClassDefiner {
+
+ /**
+ * Returns if the defined classes can bypass access checks
+ *
+ * @return if classes bypass access checks
+ */
+ public default boolean isBypassAccessChecks() {
+ return false;
+ }
+
+ /**
+ * Define a class
+ *
+ * @param parentLoader the parent classloader
+ * @param name the name of the class
+ * @param data the class data to load
+ * @return the defined class
+ * @throws ClassFormatError if the class data is invalid
+ * @throws NullPointerException if any of the arguments are null
+ */
+ @NotNull
+ public Class<?> defineClass(@NotNull ClassLoader parentLoader, @NotNull String name, @NotNull byte[] data);
+
+ @NotNull
+ public static ClassDefiner getInstance() {
+ return SafeClassDefiner.INSTANCE;
+ }
+
+}
diff --git a/src/main/java/com/destroystokyo/paper/event/executor/asm/SafeClassDefiner.java b/src/main/java/com/destroystokyo/paper/event/executor/asm/SafeClassDefiner.java
new file mode 100644
index 00000000..ac99477e
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/SafeClassDefiner.java
@@ -0,0 +1,66 @@
+package com.destroystokyo.paper.event.executor.asm;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import com.google.common.base.Preconditions;
+
+import com.google.common.collect.MapMaker;
+import org.jetbrains.annotations.NotNull;
+import org.objectweb.asm.Type;
+
+public class SafeClassDefiner implements ClassDefiner {
+ /* default */ static final SafeClassDefiner INSTANCE = new SafeClassDefiner();
+
+ private SafeClassDefiner() {}
+
+ private final ConcurrentMap<ClassLoader, GeneratedClassLoader> loaders = new MapMaker().weakKeys().makeMap();
+
+ @NotNull
+ @Override
+ public Class<?> defineClass(@NotNull ClassLoader parentLoader, @NotNull String name, @NotNull byte[] data) {
+ GeneratedClassLoader loader = loaders.computeIfAbsent(parentLoader, GeneratedClassLoader::new);
+ synchronized (loader.getClassLoadingLock(name)) {
+ Preconditions.checkState(!loader.hasClass(name), "%s already defined", name);
+ Class<?> c = loader.define(name, data);
+ assert c.getName().equals(name);
+ return c;
+ }
+ }
+
+ private static class GeneratedClassLoader extends ClassLoader {
+ static {
+ ClassLoader.registerAsParallelCapable();
+ }
+
+ protected GeneratedClassLoader(@NotNull ClassLoader parent) {
+ super(parent);
+ }
+
+ private Class<?> define(@NotNull String name, byte[] data) {
+ synchronized (getClassLoadingLock(name)) {
+ assert !hasClass(name);
+ Class<?> c = defineClass(name, data, 0, data.length);
+ resolveClass(c);
+ return c;
+ }
+ }
+
+ @Override
+ @NotNull
+ public Object getClassLoadingLock(@NotNull String name) {
+ return super.getClassLoadingLock(name);
+ }
+
+ public boolean hasClass(@NotNull String name) {
+ synchronized (getClassLoadingLock(name)) {
+ try {
+ Class.forName(name);
+ return true;
+ } catch (ClassNotFoundException e) {
+ return false;
+ }
+ }
+ }
+ }
+}
diff --git a/src/main/java/com/destroystokyo/paper/utils/UnsafeUtils.java b/src/main/java/com/destroystokyo/paper/utils/UnsafeUtils.java
new file mode 100644
index 00000000..72e48e8e
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/utils/UnsafeUtils.java
@@ -0,0 +1,35 @@
+package com.destroystokyo.paper.utils;
+
+import org.jetbrains.annotations.Nullable;
+import sun.misc.Unsafe;
+
+import java.lang.reflect.Field;
+
+public class UnsafeUtils {
+ private UnsafeUtils() {}
+
+ private static final Unsafe UNSAFE;
+ static {
+ Unsafe unsafe;
+ try {
+ Class c = Class.forName("sun.misc.Unsafe");
+ Field f = c.getDeclaredField("theUnsafe");
+ f.setAccessible(true);
+ unsafe = (Unsafe) f.get(null);
+ } catch (ClassNotFoundException | NoSuchFieldException | SecurityException e) {
+ unsafe = null;
+ } catch (IllegalAccessException e) {
+ throw new AssertionError(e);
+ }
+ UNSAFE = unsafe;
+ }
+
+ public static boolean isUnsafeSupported() {
+ return UNSAFE != null;
+ }
+
+ @Nullable
+ public static Unsafe getUnsafe() {
+ return UNSAFE;
+ }
+}
diff --git a/src/main/java/org/bukkit/plugin/EventExecutor.java b/src/main/java/org/bukkit/plugin/EventExecutor.java
index a850f078..9026e108 100644
--- a/src/main/java/org/bukkit/plugin/EventExecutor.java
+++ b/src/main/java/org/bukkit/plugin/EventExecutor.java
@@ -5,9 +5,75 @@ import org.bukkit.event.EventException;
import org.bukkit.event.Listener;
import org.jetbrains.annotations.NotNull;
+// Paper start
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.function.Function;
+
+import com.destroystokyo.paper.event.executor.MethodHandleEventExecutor;
+import com.destroystokyo.paper.event.executor.StaticMethodHandleEventExecutor;
+import com.destroystokyo.paper.event.executor.asm.ASMEventExecutorGenerator;
+import com.destroystokyo.paper.event.executor.asm.ClassDefiner;
+import com.google.common.base.Preconditions;
+// Paper end
+
/**
* Interface which defines the class for event call backs to plugins
*/
public interface EventExecutor {
public void execute(@NotNull Listener listener, @NotNull Event event) throws EventException;
+
+ // Paper start
+ ConcurrentMap<Method, Class<? extends EventExecutor>> eventExecutorMap = new ConcurrentHashMap<Method, Class<? extends EventExecutor>>() {
+ @NotNull
+ @Override
+ public Class<? extends EventExecutor> computeIfAbsent(@NotNull Method key, @NotNull Function<? super Method, ? extends Class<? extends EventExecutor>> mappingFunction) {
+ Class<? extends EventExecutor> executorClass = get(key);
+ if (executorClass != null)
+ return executorClass;
+
+ //noinspection SynchronizationOnLocalVariableOrMethodParameter
+ synchronized (key) {
+ executorClass = get(key);
+ if (executorClass != null)
+ return executorClass;
+
+ return super.computeIfAbsent(key, mappingFunction);
+ }
+ }
+ };
+
+ @NotNull
+ public static EventExecutor create(@NotNull Method m, @NotNull Class<? extends Event> eventClass) {
+ Preconditions.checkNotNull(m, "Null method");
+ Preconditions.checkArgument(m.getParameterCount() != 0, "Incorrect number of arguments %s", m.getParameterCount());
+ Preconditions.checkArgument(m.getParameterTypes()[0] == eventClass, "First parameter %s doesn't match event class %s", m.getParameterTypes()[0], eventClass);
+ ClassDefiner definer = ClassDefiner.getInstance();
+ if (Modifier.isStatic(m.getModifiers())) {
+ return new StaticMethodHandleEventExecutor(eventClass, m);
+ } else if (definer.isBypassAccessChecks() || Modifier.isPublic(m.getDeclaringClass().getModifiers()) && Modifier.isPublic(m.getModifiers())) {
+ // get the existing generated EventExecutor class for the Method or generate one
+ Class<? extends EventExecutor> executorClass = eventExecutorMap.computeIfAbsent(m, (__) -> {
+ String name = ASMEventExecutorGenerator.generateName();
+ byte[] classData = ASMEventExecutorGenerator.generateEventExecutor(m, name);
+ return definer.defineClass(m.getDeclaringClass().getClassLoader(), name, classData).asSubclass(EventExecutor.class);
+ });
+
+ try {
+ EventExecutor asmExecutor = executorClass.newInstance();
+ // Define a wrapper to conform to bukkit stupidity (passing in events that don't match and wrapper exception)
+ return (listener, event) -> {
+ if (!eventClass.isInstance(event)) return;
+ asmExecutor.execute(listener, event);
+ };
+ } catch (InstantiationException | IllegalAccessException e) {
+ throw new AssertionError("Unable to initialize generated event executor", e);
+ }
+ } else {
+ return new MethodHandleEventExecutor(eventClass, m);
+ }
+ }
+ // Paper end
}
diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
index 12601db6..06b6724f 100644
--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
@@ -301,21 +301,7 @@ public final class JavaPluginLoader implements PluginLoader {
}
}
- EventExecutor executor = new co.aikar.timings.TimedEventExecutor(new EventExecutor() { // Paper
- @Override
- public void execute(@NotNull Listener listener, @NotNull Event event) throws EventException { // Paper
- try {
- if (!eventClass.isAssignableFrom(event.getClass())) {
- return;
- }
- method.invoke(listener, event);
- } catch (InvocationTargetException ex) {
- throw new EventException(ex.getCause());
- } catch (Throwable t) {
- throw new EventException(t);
- }
- }
- }, plugin, method, eventClass); // Paper
+ EventExecutor executor = new co.aikar.timings.TimedEventExecutor(EventExecutor.create(method, eventClass), plugin, method, eventClass); // Paper // Paper (Yes.) - Use factory method `EventExecutor.create()`
if (false) { // Spigot - RL handles useTimings check now
eventSet.add(new TimedRegisteredListener(listener, executor, eh.priority(), plugin, eh.ignoreCancelled()));
} else {
--
2.22.0
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