mirror of https://github.com/PaperMC/Paper.git
368 lines
16 KiB
Diff
368 lines
16 KiB
Diff
From 0000000000000000000000000000000000000000 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/build.gradle.kts b/build.gradle.kts
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index 106d4d5756dc579c446699106f52462085ea9a52..d6252c1ff21c92bf0d232d5bfdf828d1d2ce38c0 100644
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--- a/build.gradle.kts
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+++ b/build.gradle.kts
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@@ -47,6 +47,9 @@ dependencies {
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apiAndDocs("net.kyori:adventure-text-serializer-legacy")
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apiAndDocs("net.kyori:adventure-text-serializer-plain")
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apiAndDocs("net.kyori:adventure-text-logger-slf4j")
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+
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+ implementation("org.ow2.asm:asm:9.7")
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+ implementation("org.ow2.asm:asm-commons:9.7")
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// Paper end
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compileOnly("org.apache.maven:maven-resolver-provider:3.9.6")
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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 0000000000000000000000000000000000000000..5b28e9b1daba7834af67dbc193dd656bedd9a994
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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 +1,42 @@
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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 com.destroystokyo.paper.util.SneakyThrow;
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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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+import org.jetbrains.annotations.NotNull;
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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(@NotNull Class<? extends Event> eventClass, @NotNull 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(@NotNull Class<? extends Event> eventClass, @NotNull 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(@NotNull Listener listener, @NotNull 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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+ SneakyThrow.sneaky(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 0000000000000000000000000000000000000000..827f2b27f70a7ec0bc11d039305c3e58c02a4ef4
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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 +1,42 @@
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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.destroystokyo.paper.util.SneakyThrow;
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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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+import org.jetbrains.annotations.NotNull;
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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(@NotNull Class<? extends Event> eventClass, @NotNull Method m) {
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+ Preconditions.checkArgument(Modifier.isStatic(m.getModifiers()), "Not a static method: %s", m);
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+ Preconditions.checkArgument(eventClass != null, "eventClass is null");
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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(@NotNull Listener listener, @NotNull 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 throwable) {
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+ SneakyThrow.sneaky(throwable);
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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 0000000000000000000000000000000000000000..084c31af1a7ba32bb4c3dc8f16f67fd09ce0b6a4
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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 +1,54 @@
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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.jetbrains.annotations.NotNull;
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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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+
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+ private static final String EXECUTE_DESCRIPTOR = "(Lorg/bukkit/event/Listener;Lorg/bukkit/event/Event;)V";
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+
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+ @NotNull
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+ public static byte[] generateEventExecutor(@NotNull Method m, @NotNull 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", EXECUTE_DESCRIPTOR, null, null), ACC_PUBLIC, "execute", EXECUTE_DESCRIPTOR);
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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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+ // The only purpose of this switch statement is to generate the correct pop instruction, should the event handler method return something other than void.
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+ // Non-void event handlers will be unsupported in a future release.
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+ switch (Type.getType(m.getReturnType()).getSize()) {
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+ // case 0 is omitted because the only type that has size 0 is void - no pop instruction needed.
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+ case 1 -> methodGenerator.pop(); // handles reference types and most primitives
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+ case 2 -> methodGenerator.pop2(); // handles long and double
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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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+ @NotNull
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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 0000000000000000000000000000000000000000..f79685b48bb581277a6891927988b6f7a4389dc4
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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 +1,34 @@
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+package com.destroystokyo.paper.event.executor.asm;
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+
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+import org.jetbrains.annotations.NotNull;
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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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+ @NotNull
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+ public Class<?> defineClass(@NotNull ClassLoader parentLoader, @NotNull String name, @NotNull byte[] data);
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+
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+ @NotNull
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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 0000000000000000000000000000000000000000..abcc966d8ee01d73c1d1480237ab46fa0ab55fdc
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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 +1,64 @@
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+package com.destroystokyo.paper.event.executor.asm;
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+
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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.jetbrains.annotations.NotNull;
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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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+ @NotNull
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+ @Override
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+ public Class<?> defineClass(@NotNull ClassLoader parentLoader, @NotNull String name, @NotNull 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(@NotNull ClassLoader parent) {
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+ super(parent);
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+ }
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+
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+ private Class<?> define(@NotNull 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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+ @NotNull
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+ public Object getClassLoadingLock(@NotNull 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(@NotNull 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/org/bukkit/plugin/EventExecutor.java b/src/main/java/org/bukkit/plugin/EventExecutor.java
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index a850f0780de05463fc0d3f9e15ff7f19d88b2aed..9026e108ccd3a88aee1267ee275137befa646455 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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@@ -5,9 +5,75 @@ import org.bukkit.event.EventException;
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import org.bukkit.event.Listener;
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import org.jetbrains.annotations.NotNull;
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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.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(@NotNull Listener listener, @NotNull 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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+ @NotNull
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+ @Override
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+ public Class<? extends EventExecutor> computeIfAbsent(@NotNull Method key, @NotNull 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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+ @NotNull
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+ public static EventExecutor create(@NotNull Method m, @NotNull 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 (listener, event) -> {
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+ if (!eventClass.isInstance(event)) return;
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+ asmExecutor.execute(listener, event);
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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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