Initial commit
This commit is contained in:
parent
d2fc40f0a7
commit
1a965bd4e9
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@ -12,3 +12,5 @@
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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.idea/
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.iml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>eu.mikroskeem</groupId>
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<artifactId>bytecodehackery</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.5.1</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<!--<plugin>
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<groupId>com.github.wvengen</groupId>
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<artifactId>proguard-maven-plugin</artifactId>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>proguard</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<options>
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<option>-keepattributes *Annotation*</option>
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<option>-allowaccessmodification</option>
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</options>
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<libs>
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<lib>${java.home}/lib/rt.jar</lib>
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<lib>${java.home}/lib/jce.jar</lib>
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</libs>
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</configuration>
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</plugin>-->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>2.4.3</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<filters>
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<filter>
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<artifact>*:*</artifact>
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<excludes>
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<exclude>META-INF/LICENSE</exclude>
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<exclude>META-INF/DEPENDENCIES</exclude>
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<exclude>META-INF/NOTICE</exclude>
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<exclude>META-INF/*.SF</exclude>
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<exclude>META-INF/*.DSA</exclude>
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<exclude>META-INF/*.RSA</exclude>
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<exclude>META-INF/*.properties</exclude>
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<exclude>META-INF/maven/**</exclude>
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<exclude>META-INF/services/**</exclude>
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</excludes>
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</filter>
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</filters>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<configuration>
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<archive>
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<manifest>
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<addClasspath>true</addClasspath>
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<mainClass>eu.mikroskeem.redpowder.leviathan.Main</mainClass>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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</plugins>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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<defaultGoal>clean compile package</defaultGoal>
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</build>
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<dependencies>
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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>5.1</version>
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</dependency>
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</dependencies>
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</project>
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@ -0,0 +1,63 @@
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package eu.mikroskeem.bytecodehackery;
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import java.util.Objects;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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public class GeneratedClassLoader extends ClassLoader {
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/*
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* Note: "Stolen: from Techcable's Event4j,
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* https://github.com/Techcable/Event4J/blob/master/src/main/java/net/techcable/event4j/asm/ASMEventExecutorFactory.java
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*/
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private static final ConcurrentMap<ClassLoader, GeneratedClassLoader> loaders = new ConcurrentHashMap<>();
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public static GeneratedClassLoader getLoader(ClassLoader parent) {
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return loaders.computeIfAbsent(Objects.requireNonNull(parent, "Null parent class-loader"), GeneratedClassLoader::new);
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}
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public Class<?> defineClass(String name, byte[] data) {
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name = Objects.requireNonNull(name, "Null name").replace('/', '.');
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synchronized (getClassLoadingLock(name)) {
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if (hasClass(name)) throw new IllegalStateException(name + " already defined");
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Class<?> c = this.define(name, Objects.requireNonNull(data, "Null data"));
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if (!c.getName().equals(name)) throw new IllegalArgumentException("class name " + c.getName() + " != requested name " + name);
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return c;
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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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private Class<?> define(String name, byte[] data) {
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synchronized (getClassLoadingLock(name)) {
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if (hasClass(name)) throw new IllegalStateException("Already has class: " + name);
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Class<?> c;
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try {
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c = defineClass(name, data, 0, data.length);
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} catch (ClassFormatError e) {
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throw new IllegalArgumentException("Illegal class data", e);
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}
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resolveClass(c);
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return c;
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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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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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@ -0,0 +1,77 @@
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package eu.mikroskeem.bytecodehackery;
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import org.objectweb.asm.ClassWriter;
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import org.objectweb.asm.MethodVisitor;
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import org.objectweb.asm.Type;
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import static org.objectweb.asm.Opcodes.*;
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public class Main {
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private Main() throws Exception {
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ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
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/* Generate class */
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cw.visit(V1_8, ACC_PUBLIC, (getClass().getPackage().getName() +".kek.Topkek").replaceAll("\\.", "/"),
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null, "java/lang/Object", new String[]{Type.getInternalName(TestInterface.class)});
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/* Generate constructor */
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MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
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mv.visitVarInsn(ALOAD, 0);
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/* Must-have for all classes */
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mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
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mv.visitInsn(RETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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/* Generate toString method */
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String toStringDesc = String.format("(%s)%s", "", Type.getDescriptor(String.class));
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mv = cw.visitMethod(ACC_PUBLIC, "toString", toStringDesc, null, null);
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mv.visitLdcInsn("TOPKEK LMAUUU");
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mv.visitInsn(ARETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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/* Generate a() method */
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String aDesc = String.format("(%s)%s", "", Type.getDescriptor(String.class));
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mv = cw.visitMethod(ACC_PUBLIC, "a", aDesc, null, null);
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mv.visitLdcInsn("some a() call");
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mv.visitInsn(ARETURN);
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mv.visitMaxs(1, 1);
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mv.visitEnd();
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mv = cw.visitMethod(ACC_PUBLIC, "b", "()Ljava/util/List;", "()Ljava/util/List<Ljava/lang/String;>;", null);
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mv.visitCode();
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mv.visitTypeInsn(NEW, "java/util/ArrayList");
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mv.visitInsn(DUP);
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mv.visitMethodInsn(INVOKESPECIAL, "java/util/ArrayList", "<init>", "()V", false);
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mv.visitVarInsn(ASTORE, 1);
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mv.visitVarInsn(ALOAD, 1);
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mv.visitLdcInsn("kek");
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mv.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "add", "(Ljava/lang/Object;)Z", true);
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mv.visitVarInsn(ALOAD, 1);
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mv.visitLdcInsn("ayy lmao");
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mv.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "add", "(Ljava/lang/Object;)Z", true);
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mv.visitInsn(POP);
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mv.visitVarInsn(ALOAD, 1);
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mv.visitInsn(ARETURN);
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mv.visitMaxs(2, 2);
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mv.visitEnd();
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/* Class end */
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cw.visitEnd();
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/* Load that class */
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Class<?> a = GeneratedClassLoader.getLoader(this.getClass().getClassLoader())
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.defineClass(getClass().getPackage().getName() +".kek.Topkek", cw.toByteArray());
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TestInterface b = (TestInterface) a.newInstance();
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System.out.println(b.toString());
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System.out.println(b.a());
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System.out.println(b.b());
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}
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public static void main(String... a) throws Exception {
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new Main();
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}
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}
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@ -0,0 +1,18 @@
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package eu.mikroskeem.bytecodehackery;
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import java.util.ArrayList;
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import java.util.List;
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public class TestClass {
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@Override
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public String toString() {
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return "TestClass lel";
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}
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public List<String> get(){
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List<String> r = new ArrayList<>();
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r.add("kek");
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r.add("kek2");
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return r;
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}
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}
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@ -0,0 +1,8 @@
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package eu.mikroskeem.bytecodehackery;
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import java.util.List;
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public interface TestInterface {
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String a();
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List<String> b();
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}
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