PaperMC/patches/api/0007-Use-ASM-for-event-executors.patch
Nassim Jahnke 4af62f6d1d
Updated Upstream (Bukkit/CraftBukkit/Spigot)
Upstream has released updates that appear 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:
2d009e64 Update SnakeYAML javadoc link
b4fd213c Switch Player#updateInventory deprecation for internal API annotation

CraftBukkit Changes:
f3b2b2210 SPIGOT-7376: Exception with getBlockData when hasBlockData is false
725545630 SPIGOT-7375: Fix crash breeding certain entities
b9873b0d4 Update Brigadier version with fix
68b320562 SPIGOT-7266: Found typo in CraftBukkit package
98b4d2ff8 SPIGOT-7372, SPIGOT-7373: Signs can't be edited, issues with SignChangeEvent
5f7bd4d78 SPIGOT-7371: Sign does not open edit text on placement
b4cf99d24 SPIGOT-7371: Fix editing signs with API
a2b6c2744 PR-1200: Implement open sign by side
a345bb940 SPIGOT-7368: Downgrade SpecialSource version

Spigot Changes:
723951c3 Rebuild patches
b655c57d Drop old collision API deprecated since 1.9.4
55b0fed4 Rebuild patches
2023-06-08 15:25:35 +02:00

370 lines
16 KiB
Diff

From 0000000000000000000000000000000000000000 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/build.gradle.kts b/build.gradle.kts
index 0bc5c544723e8ea0dc4441b2198b744b1a38b26b..0270849badc82810c8c288a9bd02efff93b18141 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -42,6 +42,9 @@ dependencies {
apiAndDocs("net.kyori:adventure-text-serializer-legacy")
apiAndDocs("net.kyori:adventure-text-serializer-plain")
apiAndDocs("net.kyori:adventure-text-logger-slf4j")
+
+ implementation("org.ow2.asm:asm:9.4")
+ implementation("org.ow2.asm:asm-commons:9.4")
// Paper end
compileOnly("org.apache.maven:maven-resolver-provider:3.9.2")
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 0000000000000000000000000000000000000000..5b28e9b1daba7834af67dbc193dd656bedd9a994
--- /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 0000000000000000000000000000000000000000..c83672427324bd068ed52916f700b68446a226f6
--- /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 0000000000000000000000000000000000000000..084c31af1a7ba32bb4c3dc8f16f67fd09ce0b6a4
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/ASMEventExecutorGenerator.java
@@ -0,0 +1,54 @@
+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 {
+
+ private static final String EXECUTE_DESCRIPTOR = "(Lorg/bukkit/event/Listener;Lorg/bukkit/event/Event;)V";
+
+ @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", EXECUTE_DESCRIPTOR, null, null), ACC_PUBLIC, "execute", EXECUTE_DESCRIPTOR);
+ 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());
+ // The only purpose of this switch statement is to generate the correct pop instruction, should the event handler method return something other than void.
+ // Non-void event handlers will be unsupported in a future release.
+ switch (Type.getType(m.getReturnType()).getSize()) {
+ // case 0 is omitted because the only type that has size 0 is void - no pop instruction needed.
+ case 1 -> methodGenerator.pop(); // handles reference types and most primitives
+ case 2 -> methodGenerator.pop2(); // handles long and double
+ }
+ 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 0000000000000000000000000000000000000000..f79685b48bb581277a6891927988b6f7a4389dc4
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/executor/asm/ClassDefiner.java
@@ -0,0 +1,34 @@
+package com.destroystokyo.paper.event.executor.asm;
+
+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 0000000000000000000000000000000000000000..ac99477e9f2c08041aeff31abc1d1edee58d0a67
--- /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/org/bukkit/plugin/EventExecutor.java b/src/main/java/org/bukkit/plugin/EventExecutor.java
index a850f0780de05463fc0d3f9e15ff7f19d88b2aed..9026e108ccd3a88aee1267ee275137befa646455 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
}