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Code Issues Projects Releases Wiki Activity

Very basic Mixin support

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This commit is contained in:
jglrxavpok 2020-08-23 22:38:27 +02:00
parent 223af361d8
commit 26b8ad125e
21 changed files with 599 additions and 39 deletions
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13
build.gradle
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@ -30,6 +30,10 @@ allprojects {
mavenCentral()
maven { url 'https://libraries.minecraft.net' }
maven { url 'https://jitpack.io' }
maven {
name 'sponge'
url 'http://repo.spongepowered.org/maven'
}
}
}
@ -112,8 +116,13 @@ dependencies {
annotationProcessor 'org.projectlombok:lombok:1.18.12'
// Code modification
api "org.ow2.asm:asm:6.2.1"
api "org.ow2.asm:asm-tree:6.2.1"
api "org.ow2.asm:asm:${asmVersion}"
api "org.ow2.asm:asm-tree:${asmVersion}"
api "org.ow2.asm:asm-analysis:${asmVersion}"
api "org.ow2.asm:asm-util:${asmVersion}"
api "org.ow2.asm:asm-commons:${asmVersion}"
implementation 'com.google.guava:guava:21.0'
api "org.spongepowered:mixin:${mixinVersion}"
// Path finding
api 'com.github.MadMartian:hydrazine-path-finding:1.3.1'

2
gradle.properties Normal file
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@ -0,0 +1,2 @@
asmVersion=8.0.1
mixinVersion=0.8

30
src/main/java/net/minestom/server/Bootstrap.java
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@ -1,9 +1,16 @@
package net.minestom.server;
import net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader;
import net.minestom.server.extras.selfmodification.mixins.MixinCodeModifier;
import org.spongepowered.asm.launch.MixinBootstrap;
import org.spongepowered.asm.launch.platform.CommandLineOptions;
import org.spongepowered.asm.launch.platform.MixinPlatformManager;
import org.spongepowered.asm.mixin.MixinEnvironment;
import org.spongepowered.asm.mixin.Mixins;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
/**
* Used to launch Minestom with the {@link MinestomOverwriteClassLoader} to allow for self-modifications
@ -12,13 +19,17 @@ public class Bootstrap {
public static void bootstrap(String mainClassFullName, String[] args) {
try {
ClassLoader classLoader = new MinestomOverwriteClassLoader(Bootstrap.class.getClassLoader());
ClassLoader classLoader = MinestomOverwriteClassLoader.getInstance();
startMixin(args);
MixinEnvironment.init(MixinEnvironment.Phase.INIT);
MinestomOverwriteClassLoader.getInstance().addCodeModifier(new MixinCodeModifier());
// ensure extensions are loaded when starting the server
Class<?> serverClass = classLoader.loadClass("net.minestom.server.MinecraftServer");
Method init = serverClass.getMethod("init");
init.invoke(null);
Class<?> mainClass = classLoader.loadClass(mainClassFullName);
Method main = mainClass.getDeclaredMethod("main", String[].class);
main.invoke(null, new Object[] { args });
@ -26,4 +37,21 @@ public class Bootstrap {
e.printStackTrace();
}
}
private static void startMixin(String[] args) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Method start = MixinBootstrap.class.getDeclaredMethod("start");
start.setAccessible(true);
if (! ((boolean)start.invoke(null)) ) {
return;
}
Method doInit = MixinBootstrap.class.getDeclaredMethod("doInit", CommandLineOptions.class);
doInit.setAccessible(true);
doInit.invoke(null, CommandLineOptions.ofArgs(Arrays.asList(args)));
MixinBootstrap.getPlatform().inject();
Mixins.getConfigs().forEach(c -> {
MinestomOverwriteClassLoader.getInstance().protectedPackages.add(c.getConfig().getMixinPackage());
});
}
}

123
src/main/java/net/minestom/server/extras/selfmodification/MinestomOverwriteClassLoader.java
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@ -7,11 +7,13 @@ import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.tree.ClassNode;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
@ -19,14 +21,25 @@ import java.util.Set;
@Slf4j
public class MinestomOverwriteClassLoader extends URLClassLoader {
private static MinestomOverwriteClassLoader INSTANCE;
/**
* Classes that cannot be loaded/modified by this classloader.
* Will go through parent class loader
*/
private static final Set<String> protectedClasses = Set.of(
"net.minestom.server.extras.selfmodification.CodeModifier",
"net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader"
);
public final Set<String> protectedClasses = new HashSet<>() {
{
add("net.minestom.server.extras.selfmodification.CodeModifier");
add("net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader");
}
};
public final Set<String> protectedPackages = new HashSet<>() {
{
add("com.google");
add("com.mojang");
add("org.objectweb.asm");
}
};
private final URLClassLoader asmClassLoader;
// TODO: replace by tree to optimize lookup times. We can use the fact that package names are split with '.' to allow for fast lookup
@ -38,7 +51,7 @@ public class MinestomOverwriteClassLoader extends URLClassLoader {
private final Method findParentLoadedClass;
private final Class<?> loadedCodeModifier;
public MinestomOverwriteClassLoader(ClassLoader parent) {
private MinestomOverwriteClassLoader(ClassLoader parent) {
super("Minestom ClassLoader", loadURLs(), parent);
try {
findParentLoadedClass = ClassLoader.class.getDeclaredMethod("findLoadedClass", String.class);
@ -58,6 +71,17 @@ public class MinestomOverwriteClassLoader extends URLClassLoader {
asmClassLoader = newChild(new URL[0]);
}
public static MinestomOverwriteClassLoader getInstance() {
if(INSTANCE == null) {
synchronized (MinestomOverwriteClassLoader.class) {
if(INSTANCE == null) {
INSTANCE = new MinestomOverwriteClassLoader(MinestomOverwriteClassLoader.class.getClassLoader());
}
}
}
return INSTANCE;
}
private static URL[] loadURLs() {
String classpath = System.getProperty("java.class.path");
String[] parts = classpath.split(";");
@ -110,9 +134,7 @@ public class MinestomOverwriteClassLoader extends URLClassLoader {
return super.loadClass(name, resolve);
}
String path = name.replace(".", "/") + ".class";
byte[] bytes = getResourceAsStream(path).readAllBytes();
return transformAndLoad(name, bytes, resolve);
return define(name, loadBytes(name, true), resolve);
} catch (Exception ex) {
log.trace("Fail to load class, resorting to parent loader: "+name, ex);
// fail to load class, let parent load
@ -123,32 +145,17 @@ public class MinestomOverwriteClassLoader extends URLClassLoader {
}
private boolean isProtected(String name) {
return protectedClasses.contains(name);
if(!protectedClasses.contains(name)) {
for(String start : protectedPackages) {
if(name.startsWith(start))
return true;
}
return false;
}
return true;
}
private Class<?> transformAndLoad(String name, byte[] bytes, boolean resolve) throws ClassNotFoundException {
ClassReader reader = new ClassReader(bytes);
ClassNode node = new ClassNode();
reader.accept(node, 0);
boolean modified = false;
synchronized (modifiers) {
for(CodeModifier modifier : modifiers) {
boolean shouldModify = modifier.getNamespace() == null || name.startsWith(modifier.getNamespace());
if(shouldModify) {
modified |= modifier.transform(node);
}
}
}
if(modified) {
ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES) {
@Override
protected ClassLoader getClassLoader() {
return asmClassLoader;
}
};
node.accept(writer);
bytes = writer.toByteArray();
}
private Class<?> define(String name, byte[] bytes, boolean resolve) throws ClassNotFoundException {
Class<?> defined = defineClass(name, bytes, 0, bytes.length);
log.trace("Loaded with code modifiers: "+name);
if(resolve) {
@ -157,6 +164,46 @@ public class MinestomOverwriteClassLoader extends URLClassLoader {
return defined;
}
public byte[] loadBytes(String name, boolean transform) throws IOException {
String path = name.replace(".", "/") + ".class";
byte[] bytes = getResourceAsStream(path).readAllBytes();
if(transform && !isProtected(name)) {
ClassReader reader = new ClassReader(bytes);
ClassNode node = new ClassNode();
reader.accept(node, 0);
boolean modified = false;
synchronized (modifiers) {
for(CodeModifier modifier : modifiers) {
boolean shouldModify = modifier.getNamespace() == null || name.startsWith(modifier.getNamespace());
if(shouldModify) {
modified |= modifier.transform(node);
}
}
}
if(modified) {
ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES) {
@Override
protected ClassLoader getClassLoader() {
return asmClassLoader;
}
};
node.accept(writer);
bytes = writer.toByteArray();
log.trace("Modified "+name);
}
}
return bytes;
}
@Override
public Class<?> findClass(String name) throws ClassNotFoundException {
return super.findClass(name);
}
public void resolve(Class<?> clazz) {
resolveClass(clazz);
}
@NotNull
public URLClassLoader newChild(@NotNull URL[] urls) {
return URLClassLoader.newInstance(urls, this);
@ -174,11 +221,21 @@ public class MinestomOverwriteClassLoader extends URLClassLoader {
CodeModifier modifier = (CodeModifier) modifierClass.getDeclaredConstructor().newInstance();
synchronized (modifiers) {
log.warn("Added Code modifier: "+modifier);
modifiers.add(modifier);
addCodeModifier(modifier);
}
}
} catch (MalformedURLException | ClassNotFoundException | InvocationTargetException | InstantiationException | IllegalAccessException | NoSuchMethodException e) {
e.printStackTrace();
}
}
public void addCodeModifier(CodeModifier modifier) {
synchronized (modifiers) {
modifiers.add(modifier);
}
}
public List<CodeModifier> getModifiers() {
return modifiers;
}
}

68
src/main/java/net/minestom/server/extras/selfmodification/mixins/GlobalPropertyServiceMinestom.java Normal file
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@ -0,0 +1,68 @@
package net.minestom.server.extras.selfmodification.mixins;
import org.spongepowered.asm.service.IGlobalPropertyService;
import org.spongepowered.asm.service.IPropertyKey;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
public class GlobalPropertyServiceMinestom implements IGlobalPropertyService {
private class BasicProperty implements IPropertyKey {
private final String name;
public BasicProperty(String name) {
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
BasicProperty that = (BasicProperty) o;
return Objects.equals(name, that.name);
}
@Override
public int hashCode() {
return Objects.hash(name);
}
@Override
public String toString() {
return "BasicProperty{" +
"name='" + name + '\'' +
'}';
}
}
private final Map<String, IPropertyKey> keys = new HashMap<>();
private final Map<IPropertyKey, Object> values = new HashMap<>();
@Override
public IPropertyKey resolveKey(String name) {
return keys.computeIfAbsent(name, k -> new BasicProperty(k));
}
@Override
public <T> T getProperty(IPropertyKey key) {
return (T) values.get(key);
}
@Override
public void setProperty(IPropertyKey key, Object value) {
values.put(key, value);
}
@Override
public <T> T getProperty(IPropertyKey key, T defaultValue) {
return (T) values.getOrDefault(key, defaultValue);
}
@Override
public String getPropertyString(IPropertyKey key, String defaultValue) {
return (String) values.getOrDefault(key, defaultValue);
}
}

38
src/main/java/net/minestom/server/extras/selfmodification/mixins/MinestomBytecodeProvider.java Normal file
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@ -0,0 +1,38 @@
package net.minestom.server.extras.selfmodification.mixins;
import net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.tree.ClassNode;
import org.spongepowered.asm.service.IClassBytecodeProvider;
import java.io.IOException;
public class MinestomBytecodeProvider implements IClassBytecodeProvider {
private final MinestomOverwriteClassLoader classLoader;
public MinestomBytecodeProvider(MinestomOverwriteClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
public ClassNode getClassNode(String name) throws ClassNotFoundException, IOException {
return getClassNode(name, false);
}
private ClassNode loadNode(String name, boolean transform) throws ClassNotFoundException {
ClassNode node = new ClassNode();
ClassReader reader;
try {
reader = new ClassReader(classLoader.loadBytes(name, transform));
} catch (IOException e) {
throw new ClassNotFoundException("Could not load ClassNode with name "+name, e);
}
reader.accept(node, 0);
return node;
}
@Override
public ClassNode getClassNode(String name, boolean runTransformers) throws ClassNotFoundException, IOException {
return loadNode(name, runTransformers);
}
}

34
src/main/java/net/minestom/server/extras/selfmodification/mixins/MinestomClassProvider.java Normal file
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@ -0,0 +1,34 @@
package net.minestom.server.extras.selfmodification.mixins;
import net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader;
import org.spongepowered.asm.service.IClassProvider;
import java.net.URL;
public class MinestomClassProvider implements IClassProvider {
private final MinestomOverwriteClassLoader classLoader;
public MinestomClassProvider(MinestomOverwriteClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
public URL[] getClassPath() {
return classLoader.getURLs();
}
@Override
public Class<?> findClass(String name) throws ClassNotFoundException {
return classLoader.findClass(name);
}
@Override
public Class<?> findClass(String name, boolean initialize) throws ClassNotFoundException {
return Class.forName(name, initialize, Thread.currentThread().getContextClassLoader());
}
@Override
public Class<?> findAgentClass(String name, boolean initialize) throws ClassNotFoundException {
return Class.forName(name, initialize, classLoader);
}
}

75
src/main/java/net/minestom/server/extras/selfmodification/mixins/MinestomTransformerProvider.java Normal file
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@ -0,0 +1,75 @@
package net.minestom.server.extras.selfmodification.mixins;
import net.minestom.server.extras.selfmodification.CodeModifier;
import net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader;
import org.objectweb.asm.tree.ClassNode;
import org.spongepowered.asm.service.ITransformer;
import org.spongepowered.asm.service.ITransformerProvider;
import org.spongepowered.asm.service.ITreeClassTransformer;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
public class MinestomTransformerProvider implements ITransformerProvider {
private final MinestomOverwriteClassLoader classLoader;
private List<ITransformer> transformers;
public MinestomTransformerProvider(MinestomOverwriteClassLoader classLoader) {
this.classLoader = classLoader;
}
@Override
public void addTransformerExclusion(String name) {
classLoader.protectedClasses.add(name);
}
@Override
public Collection<ITransformer> getTransformers() {
return getDelegatedTransformers();
}
@Override
public Collection<ITransformer> getDelegatedTransformers() {
if(transformers == null) {
transformers = buildTransformerList();
}
return transformers;
}
private List<ITransformer> buildTransformerList() {
List<ITransformer> result = new LinkedList<>();
for(CodeModifier modifier : classLoader.getModifiers()) {
result.add(toMixin(modifier));
}
try {
Class<?> clazz = classLoader.loadClass("org.spongepowered.asm.mixin.transformer.MixingTransformer");
ITransformer mixinTransformer = (ITransformer) clazz.getDeclaredConstructor().newInstance();
result.add(mixinTransformer);
} catch (ClassNotFoundException | InstantiationException | InvocationTargetException | NoSuchMethodException | IllegalAccessException e) {
e.printStackTrace();
}
return result;
}
private ITransformer toMixin(CodeModifier modifier) {
return new ITreeClassTransformer() {
@Override
public boolean transformClassNode(String name, String transformedName, ClassNode classNode) {
return modifier.transform(classNode);
}
@Override
public String getName() {
return modifier.getClass().getName();
}
@Override
public boolean isDelegationExcluded() {
return false;
}
};
}
}

59
src/main/java/net/minestom/server/extras/selfmodification/mixins/MixinCodeModifier.java Normal file
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@ -0,0 +1,59 @@
package net.minestom.server.extras.selfmodification.mixins;
import net.minestom.server.extras.selfmodification.CodeModifier;
import org.objectweb.asm.tree.ClassNode;
import org.spongepowered.asm.mixin.MixinEnvironment;
import org.spongepowered.asm.mixin.transformer.MixinProcessor;
import org.spongepowered.asm.mixin.transformer.ext.Extensions;
import org.spongepowered.asm.mixin.transformer.ext.IHotSwap;
import org.spongepowered.asm.service.ISyntheticClassInfo;
import org.spongepowered.asm.service.ISyntheticClassRegistry;
import org.spongepowered.asm.transformers.TreeTransformer;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class MixinCodeModifier extends CodeModifier {
private Method transformClassMethod;
private TreeTransformer processor;
public MixinCodeModifier() {
try {
Class<?> mixinTransformerClass = Class.forName("org.spongepowered.asm.mixin.transformer.MixinTransformer");
Constructor<?> ctor = mixinTransformerClass.getDeclaredConstructor();
ctor.setAccessible(true);
this.processor = (TreeTransformer) ctor.newInstance();
transformClassMethod = mixinTransformerClass.getDeclaredMethod("transformClass", MixinEnvironment.class, String.class, ClassNode.class);
transformClassMethod.setAccessible(true);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
@Override
public boolean transform(ClassNode source) {
try {
return (boolean) transformClassMethod.invoke(processor, MixinEnvironment.getEnvironment(MixinEnvironment.Phase.DEFAULT), source.name.replace("/", "."), source);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return false;
}
@Override
public String getNamespace() {
return null;
}
}

29
src/main/java/net/minestom/server/extras/selfmodification/mixins/MixinPlatformAgentMinestom.java Normal file
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@ -0,0 +1,29 @@
package net.minestom.server.extras.selfmodification.mixins;
import org.spongepowered.asm.launch.platform.IMixinPlatformServiceAgent;
import org.spongepowered.asm.launch.platform.MixinPlatformAgentAbstract;
import org.spongepowered.asm.launch.platform.MixinPlatformManager;
import org.spongepowered.asm.launch.platform.container.IContainerHandle;
import org.spongepowered.asm.util.Constants;
import java.util.Collection;
public class MixinPlatformAgentMinestom extends MixinPlatformAgentAbstract implements IMixinPlatformServiceAgent {
@Override
public void init() { }
@Override
public String getSideName() {
return Constants.SIDE_SERVER;
}
@Override
public AcceptResult accept(MixinPlatformManager manager, IContainerHandle handle) {
return AcceptResult.ACCEPTED;
}
@Override
public Collection<IContainerHandle> getMixinContainers() {
return null;
}
}

86
src/main/java/net/minestom/server/extras/selfmodification/mixins/MixinServiceMinestom.java Normal file
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@ -0,0 +1,86 @@
package net.minestom.server.extras.selfmodification.mixins;
import net.minestom.server.extras.selfmodification.MinestomOverwriteClassLoader;
import org.spongepowered.asm.launch.platform.container.ContainerHandleVirtual;
import org.spongepowered.asm.launch.platform.container.IContainerHandle;
import org.spongepowered.asm.mixin.MixinEnvironment;
import org.spongepowered.asm.service.*;
import org.spongepowered.asm.util.IConsumer;
import java.io.InputStream;
import java.util.Collection;
import java.util.Collections;
public class MixinServiceMinestom extends MixinServiceAbstract {
private final MinestomOverwriteClassLoader classLoader;
private final MinestomClassProvider classProvider;
private final MinestomBytecodeProvider bytecodeProvider;
private final MinestomTransformerProvider transformerProvider;
public MixinServiceMinestom() {
this.classLoader = MinestomOverwriteClassLoader.getInstance();
classProvider = new MinestomClassProvider(classLoader);
bytecodeProvider = new MinestomBytecodeProvider(classLoader);
transformerProvider = new MinestomTransformerProvider(classLoader);
}
@Override
public String getName() {
return "Minestom";
}
@Override
public boolean isValid() {
return true;
}
@Override
public IClassProvider getClassProvider() {
return classProvider;
}
@Override
public IClassBytecodeProvider getBytecodeProvider() {
return bytecodeProvider;
}
@Override
public ITransformerProvider getTransformerProvider() {
return transformerProvider;
}
@Override
public Collection<String> getPlatformAgents() {
return Collections.singletonList("net.minestom.server.extras.selfmodification.mixins.MixinPlatformAgentMinestom");
}
@Override
public IContainerHandle getPrimaryContainer() {
return new ContainerHandleVirtual("Minestom");
}
@Override
public InputStream getResourceAsStream(String name) {
return classLoader.getResourceAsStream(name);
}
// TODO: everything below
@Override
public IClassTracker getClassTracker() {
return null;
}
@Override
public IMixinAuditTrail getAuditTrail() {
return null;
}
@Override
public void wire(MixinEnvironment.Phase phase, IConsumer<MixinEnvironment.Phase> phaseConsumer) {
super.wire(phase, phaseConsumer);
phaseConsumer.accept(MixinEnvironment.Phase.PREINIT);
phaseConsumer.accept(MixinEnvironment.Phase.INIT);
}
}

20
src/main/java/net/minestom/server/extras/selfmodification/mixins/MixinServiceMinestomBootstrap.java Normal file
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@ -0,0 +1,20 @@
package net.minestom.server.extras.selfmodification.mixins;
import org.spongepowered.asm.service.IMixinServiceBootstrap;
public class MixinServiceMinestomBootstrap implements IMixinServiceBootstrap {
@Override
public String getName() {
return "MinestomBootstrap";
}
@Override
public String getServiceClassName() {
return "net.minestom.server.extras.selfmodification.mixins.MixinServiceMinestom";
}
@Override
public void bootstrap() {
}
}

1
src/main/resources/META-INF/services/org.spongepowered.asm.service.IGlobalPropertyService Normal file
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@ -0,0 +1 @@
net.minestom.server.extras.selfmodification.mixins.GlobalPropertyServiceMinestom

1
src/main/resources/META-INF/services/org.spongepowered.asm.service.IMixinService Normal file
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@ -0,0 +1 @@
net.minestom.server.extras.selfmodification.mixins.MixinServiceMinestom

1
src/main/resources/META-INF/services/org.spongepowered.asm.service.IMixinServiceBootstrap Normal file
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@ -0,0 +1 @@
net.minestom.server.extras.selfmodification.mixins.MixinServiceMinestomBootstrap

7
src/main/resources/log4j2.xml
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@ -2,13 +2,16 @@
<Configuration status="WARN" strict="true" name="Minestom">
<Appenders>
<Appender type="Console" name="STDOUT">
<Layout type="PatternLayout" pattern="[%t] [%d{HH:mm:ss}] %p - %m%n"/>
<Layout type="PatternLayout" pattern="[%t] [%d{HH:mm:ss}] - %p - %m%n"/>
</Appender>
<Appender type="Console" name="STDOUT-WithCaller">
<Layout type="PatternLayout" pattern="[%t] [%d{HH:mm:ss}] (%C{1}.%M) - %p - %m%n"/>
</Appender>
</Appenders>
<Loggers>
<Root level="trace">
<AppenderRef ref="STDOUT" level="info"/>
<AppenderRef ref="STDOUT-WithCaller" level="info"/>
</Root>
</Loggers>
</Configuration>

4
src/test/java/testextension/TestExtensionLauncher.java
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@ -1,12 +1,16 @@
package testextension;
import net.minestom.server.Bootstrap;
import org.spongepowered.asm.launch.MixinBootstrap;
import org.spongepowered.asm.mixin.Mixins;
// To launch with VM arguments:
// -Dminestom.extension.indevfolder.classes=build/classes/java/test/ -Dminestom.extension.indevfolder.resources=build/resources/test/
public class TestExtensionLauncher {
public static void main(String[] args) {
MixinBootstrap.init();
Mixins.addConfiguration("mixins.testextension.json");
Bootstrap.bootstrap("fr.themode.demo.MainDemo", args);
}

17
src/test/java/testextension/TestExtensionLauncherArgs.java Normal file
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@ -0,0 +1,17 @@
package testextension;
import net.minestom.server.Bootstrap;
// To launch with VM arguments:
// -Dminestom.extension.indevfolder.classes=build/classes/java/test/ -Dminestom.extension.indevfolder.resources=build/resources/test/
public class TestExtensionLauncherArgs {
public static void main(String[] args) {
String[] argsWithMixins = new String[args.length+2];
System.arraycopy(args, 0, argsWithMixins, 0, args.length);
argsWithMixins[argsWithMixins.length-2] = "--mixin";
argsWithMixins[argsWithMixins.length-1] = "mixins.testextension.json";
Bootstrap.bootstrap("fr.themode.demo.MainDemo", argsWithMixins);
}
}

2
src/test/java/testextension/TestModifier.java
View File

@ -10,7 +10,7 @@ public class TestModifier extends CodeModifier implements Opcodes {
@Override
public boolean transform(ClassNode source) {
if(source.name.equals("net/minestom/server/instance/InstanceContainer")) {
System.out.println("Modifying code source of "+source.name);
System.out.println("Modifying code of "+source.name);
MethodNode constructor = findConstructor(source.methods);
constructor.instructions.insert(constructor.instructions.getFirst(), buildInjectionCode());
return true;

18
src/test/java/testextension/mixins/InstanceContainerMixin.java Normal file
View File

@ -0,0 +1,18 @@
package testextension.mixins;
import net.minestom.server.instance.InstanceContainer;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
@Mixin(InstanceContainer.class)
public class InstanceContainerMixin {
@Inject(method = "<init>", at = @At("RETURN"))
private void onRunHead(CallbackInfo ci) {
System.out.println("Hello from Mixin!!!");
}
}

10
src/test/resources/mixins.testextension.json Normal file
View File

@ -0,0 +1,10 @@
{
"required": true,
"minVersion": "0.8",
"package": "testextension.mixins",
"target": "@env(DEFAULT)",
"compatibilityLevel": "JAVA_11",
"mixins": [
"InstanceContainerMixin"
]
}