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9c79dd3214
the first 'major' change in this PR is to cache the generated event executrs from the ASM class, by doing this we only generate a single class for every method that we need an executor for, thus reducing the number of classes that are needed, especially in cases where plugins re/unregister events all the time. The second change is to modify the generated classloader map, generated classloaders are not held against the plugin itself but the classloader that the event is declared in, the implication here is that we cannot drop generated classloaders when a plugin disable, and so we use a guava weak-key'd hashmap, downfall here is that classes won't be GC'd until guava drops the generated classloader, however the first change should deal with most of the grunt.
426 lines
17 KiB
Diff
426 lines
17 KiB
Diff
From d6c062cb8c337535554a3fcb0008ede65a33c86b Mon Sep 17 00:00:00 2001
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From: Techcable <Techcable@outlook.com>
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Date: Thu, 3 Mar 2016 13:20:33 -0700
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Subject: [PATCH] Use ASM for event executors.
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Uses method handles for private or static methods.
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diff --git a/pom.xml b/pom.xml
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index c6bdf44e..31b6f51b 100644
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--- a/pom.xml
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+++ b/pom.xml
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@@ -128,6 +128,12 @@
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<version>1.3</version>
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<scope>test</scope>
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</dependency>
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+ <!-- ASM -->
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+ <dependency>
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+ <groupId>org.ow2.asm</groupId>
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+ <artifactId>asm-all</artifactId>
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+ <version>5.0.4</version>
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+ </dependency>
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</dependencies>
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<build>
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diff --git a/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java b/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java
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new file mode 100644
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index 00000000..9ff99e3b
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java
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@@ -0,0 +1,40 @@
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+package com.destroystokyo.paper.event.executor;
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+
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+import java.lang.invoke.MethodHandle;
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+import java.lang.invoke.MethodHandles;
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+import java.lang.reflect.Method;
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+
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+import org.bukkit.event.Event;
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+import org.bukkit.event.EventException;
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+import org.bukkit.event.Listener;
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+import org.bukkit.plugin.EventExecutor;
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+
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+public class MethodHandleEventExecutor implements EventExecutor {
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+ private final Class<? extends Event> eventClass;
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+ private final MethodHandle handle;
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+
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+ public MethodHandleEventExecutor(Class<? extends Event> eventClass, MethodHandle handle) {
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+ this.eventClass = eventClass;
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+ this.handle = handle;
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+ }
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+
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+ public MethodHandleEventExecutor(Class<? extends Event> eventClass, Method m) {
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+ this.eventClass = eventClass;
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+ try {
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+ m.setAccessible(true);
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+ this.handle = MethodHandles.lookup().unreflect(m);
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+ } catch (IllegalAccessException e) {
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+ throw new AssertionError("Unable to set accessible", e);
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+ }
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+ }
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+
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+ @Override
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+ public void execute(Listener listener, Event event) throws EventException {
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+ if (!eventClass.isInstance(event)) return;
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+ try {
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+ handle.invoke(listener, event);
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+ } catch (Throwable t) {
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+ throw new EventException(t);
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+ }
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+ }
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+}
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diff --git a/src/main/java/com/destroystokyo/paper/event/executor/StaticMethodHandleEventExecutor.java b/src/main/java/com/destroystokyo/paper/event/executor/StaticMethodHandleEventExecutor.java
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new file mode 100644
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index 00000000..f60f0100
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/executor/StaticMethodHandleEventExecutor.java
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@@ -0,0 +1,39 @@
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+package com.destroystokyo.paper.event.executor;
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+
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+import java.lang.invoke.MethodHandle;
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+import java.lang.invoke.MethodHandles;
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+import java.lang.reflect.Method;
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+import java.lang.reflect.Modifier;
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+
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+import com.google.common.base.Preconditions;
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+
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+import org.bukkit.event.Event;
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+import org.bukkit.event.EventException;
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+import org.bukkit.event.Listener;
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+import org.bukkit.plugin.EventExecutor;
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+
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+public class StaticMethodHandleEventExecutor implements EventExecutor {
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+ private final Class<? extends Event> eventClass;
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+ private final MethodHandle handle;
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+
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+ public StaticMethodHandleEventExecutor(Class<? extends Event> eventClass, Method m) {
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+ Preconditions.checkArgument(Modifier.isStatic(m.getModifiers()), "Not a static method: %s", m);
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+ this.eventClass = eventClass;
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+ try {
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+ m.setAccessible(true);
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+ this.handle = MethodHandles.lookup().unreflect(m);
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+ } catch (IllegalAccessException e) {
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+ throw new AssertionError("Unable to set accessible", e);
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+ }
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+ }
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+
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+ @Override
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+ public void execute(Listener listener, Event event) throws EventException {
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+ if (!eventClass.isInstance(event)) return;
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+ try {
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+ handle.invoke(event);
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+ } catch (Throwable t) {
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+ throw new EventException(t);
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+ }
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+ }
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+}
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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
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new file mode 100644
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index 00000000..140cf0ad
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/ASMEventExecutorGenerator.java
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@@ -0,0 +1,44 @@
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+package com.destroystokyo.paper.event.executor.asm;
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+
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+import java.lang.reflect.Method;
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+import java.util.concurrent.atomic.AtomicInteger;
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+
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+import org.bukkit.plugin.EventExecutor;
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+import org.objectweb.asm.ClassWriter;
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+import org.objectweb.asm.Type;
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+import org.objectweb.asm.commons.GeneratorAdapter;
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+
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+import static org.objectweb.asm.Opcodes.*;
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+
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+public class ASMEventExecutorGenerator {
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+ public static byte[] generateEventExecutor(Method m, String name) {
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+ ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
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+ writer.visit(V1_8, ACC_PUBLIC, name.replace('.', '/'), null, Type.getInternalName(Object.class), new String[] {Type.getInternalName(EventExecutor.class)});
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+ // Generate constructor
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+ GeneratorAdapter methodGenerator = new GeneratorAdapter(writer.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null), ACC_PUBLIC, "<init>", "()V");
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+ methodGenerator.loadThis();
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+ methodGenerator.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(Object.class), "<init>", "()V", false); // Invoke the super class (Object) constructor
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+ methodGenerator.returnValue();
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+ methodGenerator.endMethod();
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+ // Generate the execute method
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+ 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");;
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+ methodGenerator.loadArg(0);
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+ methodGenerator.checkCast(Type.getType(m.getDeclaringClass()));
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+ methodGenerator.loadArg(1);
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+ methodGenerator.checkCast(Type.getType(m.getParameterTypes()[0]));
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+ methodGenerator.visitMethodInsn(m.getDeclaringClass().isInterface() ? INVOKEINTERFACE : INVOKEVIRTUAL, Type.getInternalName(m.getDeclaringClass()), m.getName(), Type.getMethodDescriptor(m), m.getDeclaringClass().isInterface());
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+ if (m.getReturnType() != void.class) {
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+ methodGenerator.pop();
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+ }
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+ methodGenerator.returnValue();
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+ methodGenerator.endMethod();
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+ writer.visitEnd();
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+ return writer.toByteArray();
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+ }
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+
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+ public static AtomicInteger NEXT_ID = new AtomicInteger(1);
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+ public static String generateName() {
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+ int id = NEXT_ID.getAndIncrement();
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+ return "com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor" + id;
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+ }
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+}
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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
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new file mode 100644
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index 00000000..6941d9fb
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/ClassDefiner.java
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@@ -0,0 +1,32 @@
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+package com.destroystokyo.paper.event.executor.asm;
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+
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+import com.destroystokyo.paper.utils.UnsafeUtils;
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+
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+public interface ClassDefiner {
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+
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+ /**
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+ * Returns if the defined classes can bypass access checks
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+ *
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+ * @return if classes bypass access checks
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+ */
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+ public default boolean isBypassAccessChecks() {
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+ return false;
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+ }
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+
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+ /**
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+ * Define a class
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+ *
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+ * @param parentLoader the parent classloader
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+ * @param name the name of the class
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+ * @param data the class data to load
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+ * @return the defined class
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+ * @throws ClassFormatError if the class data is invalid
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+ * @throws NullPointerException if any of the arguments are null
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+ */
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+ public Class<?> defineClass(ClassLoader parentLoader, String name, byte[] data);
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+
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+ public static ClassDefiner getInstance() {
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+ return SafeClassDefiner.INSTANCE;
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+ }
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+
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+}
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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
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new file mode 100644
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index 00000000..1473ff8c
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/SafeClassDefiner.java
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@@ -0,0 +1,63 @@
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+package com.destroystokyo.paper.event.executor.asm;
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+
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+import java.util.concurrent.ConcurrentHashMap;
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+import java.util.concurrent.ConcurrentMap;
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+
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+import com.google.common.base.Preconditions;
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+
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+import com.google.common.collect.MapMaker;
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+import org.objectweb.asm.Type;
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+
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+public class SafeClassDefiner implements ClassDefiner {
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+ /* default */ static final SafeClassDefiner INSTANCE = new SafeClassDefiner();
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+
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+ private SafeClassDefiner() {}
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+
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+ private final ConcurrentMap<ClassLoader, GeneratedClassLoader> loaders = new MapMaker().weakKeys().makeMap();
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+
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+ @Override
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+ public Class<?> defineClass(ClassLoader parentLoader, String name, byte[] data) {
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+ GeneratedClassLoader loader = loaders.computeIfAbsent(parentLoader, GeneratedClassLoader::new);
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+ synchronized (loader.getClassLoadingLock(name)) {
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+ Preconditions.checkState(!loader.hasClass(name), "%s already defined", name);
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+ Class<?> c = loader.define(name, data);
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+ assert c.getName().equals(name);
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+ return c;
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+ }
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+ }
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+
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+ private static class GeneratedClassLoader extends ClassLoader {
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+ static {
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+ ClassLoader.registerAsParallelCapable();
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+ }
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+
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+ protected GeneratedClassLoader(ClassLoader parent) {
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+ super(parent);
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+ }
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+
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+ private Class<?> define(String name, byte[] data) {
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+ synchronized (getClassLoadingLock(name)) {
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+ assert !hasClass(name);
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+ Class<?> c = defineClass(name, data, 0, data.length);
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+ resolveClass(c);
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+ return c;
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+ }
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+ }
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+
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+ @Override
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+ public Object getClassLoadingLock(String name) {
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+ return super.getClassLoadingLock(name);
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+ }
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+
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+ public boolean hasClass(String name) {
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+ synchronized (getClassLoadingLock(name)) {
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+ try {
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+ Class.forName(name);
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+ return true;
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+ } catch (ClassNotFoundException e) {
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+ return false;
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+ }
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+ }
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+ }
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+ }
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+}
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diff --git a/src/main/java/com/destroystokyo/paper/utils/UnsafeUtils.java b/src/main/java/com/destroystokyo/paper/utils/UnsafeUtils.java
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new file mode 100644
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index 00000000..62acbf82
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/utils/UnsafeUtils.java
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@@ -0,0 +1,33 @@
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+package com.destroystokyo.paper.utils;
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+
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+import sun.misc.Unsafe;
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+
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+import java.lang.reflect.Field;
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+
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+public class UnsafeUtils {
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+ private UnsafeUtils() {}
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+
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+ private static final Unsafe UNSAFE;
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+ static {
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+ Unsafe unsafe;
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+ try {
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+ Class c = Class.forName("sun.misc.Unsafe");
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+ Field f = c.getDeclaredField("theUnsafe");
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+ f.setAccessible(true);
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+ unsafe = (Unsafe) f.get(null);
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+ } catch (ClassNotFoundException | NoSuchFieldException | SecurityException e) {
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+ unsafe = null;
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+ } catch (IllegalAccessException e) {
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+ throw new AssertionError(e);
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+ }
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+ UNSAFE = unsafe;
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+ }
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+
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+ public static boolean isUnsafeSupported() {
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+ return UNSAFE != null;
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+ }
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+
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+ public static Unsafe getUnsafe() {
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+ return UNSAFE;
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+ }
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+}
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diff --git a/src/main/java/org/bukkit/plugin/EventExecutor.java b/src/main/java/org/bukkit/plugin/EventExecutor.java
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index 3b2c99ea..b45b6c1c 100644
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--- a/src/main/java/org/bukkit/plugin/EventExecutor.java
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+++ b/src/main/java/org/bukkit/plugin/EventExecutor.java
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@@ -4,9 +4,81 @@ import org.bukkit.event.Event;
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import org.bukkit.event.EventException;
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import org.bukkit.event.Listener;
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+// Paper start
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+import java.lang.reflect.Method;
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+import java.lang.reflect.Modifier;
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+import java.util.HashMap;
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+import java.util.concurrent.ConcurrentHashMap;
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+import java.util.concurrent.ConcurrentMap;
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+import java.util.function.Function;
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+
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+import com.destroystokyo.paper.event.executor.MethodHandleEventExecutor;
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+import com.destroystokyo.paper.event.executor.StaticMethodHandleEventExecutor;
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+import com.destroystokyo.paper.event.executor.asm.ASMEventExecutorGenerator;
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+import com.destroystokyo.paper.event.executor.asm.ClassDefiner;
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+import com.google.common.base.Preconditions;
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+// Paper end
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+
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/**
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* Interface which defines the class for event call backs to plugins
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*/
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public interface EventExecutor {
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public void execute(Listener listener, Event event) throws EventException;
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+
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+ // Paper start
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+ ConcurrentMap<Method, Class<? extends EventExecutor>> eventExecutorMap = new ConcurrentHashMap<Method, Class<? extends EventExecutor>>() {
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+ @Override
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+ public Class<? extends EventExecutor> computeIfAbsent(Method key, Function<? super Method, ? extends Class<? extends EventExecutor>> mappingFunction) {
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+ Class<? extends EventExecutor> executorClass = get(key);
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+ if (executorClass != null)
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+ return executorClass;
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+
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+ //noinspection SynchronizationOnLocalVariableOrMethodParameter
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+ synchronized (key) {
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+ executorClass = get(key);
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+ if (executorClass != null)
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+ return executorClass;
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+
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+ return super.computeIfAbsent(key, mappingFunction);
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+ }
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+ }
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+ };
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+
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+ public static EventExecutor create(Method m, Class<? extends Event> eventClass) {
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+ Preconditions.checkNotNull(m, "Null method");
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+ Preconditions.checkArgument(m.getParameterCount() != 0, "Incorrect number of arguments %s", m.getParameterCount());
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+ Preconditions.checkArgument(m.getParameterTypes()[0] == eventClass, "First parameter %s doesn't match event class %s", m.getParameterTypes()[0], eventClass);
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+ ClassDefiner definer = ClassDefiner.getInstance();
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+ if (Modifier.isStatic(m.getModifiers())) {
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+ return new StaticMethodHandleEventExecutor(eventClass, m);
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+ } else if (definer.isBypassAccessChecks() || Modifier.isPublic(m.getDeclaringClass().getModifiers()) && Modifier.isPublic(m.getModifiers())) {
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+ // get the existing generated EventExecutor class for the Method or generate one
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+ Class<? extends EventExecutor> executorClass = eventExecutorMap.computeIfAbsent(m, (__) -> {
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+ String name = ASMEventExecutorGenerator.generateName();
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+ byte[] classData = ASMEventExecutorGenerator.generateEventExecutor(m, name);
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+ return definer.defineClass(m.getDeclaringClass().getClassLoader(), name, classData).asSubclass(EventExecutor.class);
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+ });
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+
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+ try {
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+ EventExecutor asmExecutor = executorClass.newInstance();
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+ // Define a wrapper to conform to bukkit stupidity (passing in events that don't match and wrapper exception)
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+ return new EventExecutor() {
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+ @Override
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+ public void execute(Listener listener, Event event) throws EventException {
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+ if (!eventClass.isInstance(event)) return;
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+ try {
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+ asmExecutor.execute(listener, event);
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+ } catch (Exception e) {
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+ throw new EventException(e);
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+ }
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+ }
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+ };
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+ } catch (InstantiationException | IllegalAccessException e) {
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+ throw new AssertionError("Unable to initialize generated event executor", e);
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+ }
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+ } else {
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+ return new MethodHandleEventExecutor(eventClass, m);
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+ }
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+ }
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+ // Paper end
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}
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diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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index d8b9c244..40fd71dc 100644
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--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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@@ -287,20 +287,7 @@ public final class JavaPluginLoader implements PluginLoader {
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}
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}
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- EventExecutor executor = new co.aikar.timings.TimedEventExecutor(new EventExecutor() { // Spigot
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- public void execute(Listener listener, Event event) throws EventException {
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- try {
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- if (!eventClass.isAssignableFrom(event.getClass())) {
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- return;
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- }
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- method.invoke(listener, event);
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- } catch (InvocationTargetException ex) {
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- throw new EventException(ex.getCause());
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- } catch (Throwable t) {
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- throw new EventException(t);
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- }
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- }
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- }, plugin, method, eventClass); // Spigot
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+ EventExecutor executor = new co.aikar.timings.TimedEventExecutor(EventExecutor.create(method, eventClass), plugin, method, eventClass); // Spigot // Paper - Use factory method `EventExecutor.create()`
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if (false) { // Spigot - RL handles useTimings check now
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eventSet.add(new TimedRegisteredListener(listener, executor, eh.priority(), plugin, eh.ignoreCancelled()));
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} else {
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--
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2.14.1
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