Eliminate transitive children, add missing object bounds

- Remove referenced check from Infima
- Correctly identify contra & covariance for chains for tphs

resources/bytecode/javFiles/TXGenerics.jav

@@ -0,0 +1,11 @@
+import java.lang.String;
+
+class TXGenerics {
+    a;
+    b;
+
+    test() {
+        var c = new Cycle();
+        c.m(a, b);
+    }
+}

resources/insertGenericsJav/TestContraVariant.jav

@@ -5,7 +5,7 @@ public class TestContraVariant {
         x = y;
         return y;
     }
-    
+
     main(x) {
     	return m(x);
     }

resources/insertGenericsJav/TestTwoCalls.jav

@@ -1,10 +1,12 @@
 public class TestTwoCalls {
 
+    // <O> O -> O
     id(b) {
         var c = b;
         return c;
     }
-    
+
+    // <T, S> (S, T) -> T
     main(x,y) {
     	id(x);
     	return id(y);

src/main/java/de/dhbwstuttgart/bytecode/Codegen.java

@@ -1000,7 +1000,7 @@ public class Codegen {
     private void generateConstructor(TargetConstructor constructor) {
         MethodVisitor mv = cw.visitMethod(constructor.access() | ACC_PUBLIC, "<init>", constructor.getDescriptor(), constructor.getSignature(), null);
         if (constructor.txGenerics() != null)
-            mv.visitAttribute(new JavaTXSignatureAttribute(cw.newConst(constructor.getTXSignature())));
+            mv.visitAttribute(new JavaTXSignatureAttribute(constructor.getTXSignature()));
 
         mv.visitCode();
         var state = new State(null, mv, 1);
@@ -1027,7 +1027,7 @@ public class Codegen {
         // TODO The older codegen has set ACC_PUBLIC for all methods, good for testing but bad for everything else
         MethodVisitor mv = cw.visitMethod(method.access() | ACC_PUBLIC, method.name(), method.getDescriptor(), method.getSignature(), null);
         if (method.txSignature() != null) {
-            mv.visitAttribute(new JavaTXSignatureAttribute(cw.newConst(method.getTXSignature())));
+            mv.visitAttribute(new JavaTXSignatureAttribute(method.getTXSignature()));
         }
 
         System.out.println(method.getDescriptor());
@@ -1044,11 +1044,14 @@ public class Codegen {
     }
 
     private static String generateSignature(TargetClass clazz, Set<TargetGeneric> generics) {
-        String ret = "<";
-        for (var generic : generics) {
-            ret += generic.name() + ":" + generic.bound().toDescriptor();
+        String ret = "";
+        if (generics.size() > 0) {
+            ret += "<";
+            for (var generic : generics) {
+                ret += generic.name() + ":" + generic.bound().toDescriptor();
+            }
+            ret += ">";
         }
-        ret += ">";
         ret += clazz.superType().toDescriptor();
 
         return ret;
@@ -1060,7 +1063,7 @@ public class Codegen {
                 clazz.implementingInterfaces().stream().map(TargetType::toSignature).toArray(String[]::new)
         );
         if (clazz.txGenerics() != null)
-            cw.visitAttribute(new JavaTXSignatureAttribute(cw.newConst(generateSignature(clazz, clazz.txGenerics()))));
+            cw.visitAttribute(new JavaTXSignatureAttribute(generateSignature(clazz, clazz.txGenerics())));
 
         clazz.fields().forEach(this::generateField);
         clazz.constructors().forEach(this::generateConstructor);

src/main/java/de/dhbwstuttgart/bytecode/JavaTXSignatureAttribute.java

@@ -3,10 +3,13 @@ package de.dhbwstuttgart.bytecode;
 import org.objectweb.asm.*;
 
 public class JavaTXSignatureAttribute extends Attribute {
-    final int signature;
+    public String signature;
 
-    protected JavaTXSignatureAttribute(int signature) {
+    public JavaTXSignatureAttribute() {
         super("JavaTXSignature");
+    }
+    protected JavaTXSignatureAttribute(String signature) {
+        this();
         this.signature = signature;
     }
 
@@ -14,13 +17,14 @@ public class JavaTXSignatureAttribute extends Attribute {
     protected Attribute read(ClassReader classReader, int offset, int length, char[] charBuffer, int codeAttributeOffset, Label[] labels) {
         var data = new byte[length];
         System.arraycopy(classReader.b, offset, data, 0, length);
-        return new JavaTXSignatureAttribute(data[0] << 8 | data[1]);
+        var constantPoolOffset = data[0] << 8 | data[1];
+        return new JavaTXSignatureAttribute((String) classReader.readConst(constantPoolOffset, charBuffer));
     }
 
     @Override
     protected ByteVector write(ClassWriter classWriter, byte[] code, int codeLength, int maxStack, int maxLocals) {
         var data = new ByteVector();
-        data.putShort(this.signature);
+        data.putShort(classWriter.newConst(this.signature));
         return data;
     }
 }

src/main/java/de/dhbwstuttgart/syntaxtree/GenericDeclarationList.java

@@ -49,4 +49,17 @@ public class GenericDeclarationList extends SyntaxTreeNode implements Iterable<G
 	public String toString() {
 		return this.gtvs.toString();
 	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) return true;
+		if (o == null || getClass() != o.getClass()) return false;
+		GenericDeclarationList that = (GenericDeclarationList) o;
+		return gtvs.equals(that.gtvs);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(gtvs);
+	}
 }

src/main/java/de/dhbwstuttgart/syntaxtree/GenericTypeVar.java

@@ -6,6 +6,7 @@ import org.antlr.v4.runtime.Token;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 /**
  *  Entspricht einem GenericTypeVar, jedoch mit Bounds
@@ -45,7 +46,7 @@ public class GenericTypeVar extends SyntaxTreeNode
 
     public String toString()
     {
-        return "BoGTV " + this.name;
+        return "BoGTV " + this.name + " " + this.bounds;
     }
 
     public String getName(){
@@ -61,4 +62,17 @@ public class GenericTypeVar extends SyntaxTreeNode
     public void accept(ASTVisitor visitor) {
         visitor.visit(this);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        GenericTypeVar that = (GenericTypeVar) o;
+        return bounds.equals(that.bounds) && name.equals(that.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(bounds, name);
+    }
 }

src/main/java/de/dhbwstuttgart/syntaxtree/factory/ASTFactory.java

@@ -1,19 +1,16 @@
 package de.dhbwstuttgart.syntaxtree.factory;
 
+import java.io.IOException;
 import java.lang.reflect.*;
 import java.lang.reflect.Constructor;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Optional;
-import java.util.Set;
+import java.lang.reflect.Type;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.*;
 
-import de.dhbwstuttgart.exceptions.NotImplementedException;
+import de.dhbwstuttgart.bytecode.JavaTXSignatureAttribute;
 import de.dhbwstuttgart.parser.NullToken;
-import de.dhbwstuttgart.parser.SyntaxTreeGenerator.GenericContext;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
-import de.dhbwstuttgart.parser.scope.JavaClassRegistry;
 import de.dhbwstuttgart.syntaxtree.Field;
 import de.dhbwstuttgart.syntaxtree.Method;
 import de.dhbwstuttgart.syntaxtree.type.*;
@@ -22,7 +19,14 @@ import de.dhbwstuttgart.syntaxtree.*;
 import de.dhbwstuttgart.syntaxtree.statement.Block;
 import de.dhbwstuttgart.syntaxtree.statement.Statement;
 import de.dhbwstuttgart.syntaxtree.type.WildcardType;
+import de.dhbwstuttgart.target.tree.type.TargetRefType;
+import de.dhbwstuttgart.util.Pair;
+import javassist.bytecode.SignatureAttribute;
 import org.antlr.v4.runtime.Token;
+import org.apache.commons.io.IOUtils;
+import org.objectweb.asm.*;
+import org.objectweb.asm.signature.SignatureReader;
+import org.objectweb.asm.signature.SignatureVisitor;
 
 /**
  * Anmerkung:
@@ -32,21 +36,76 @@ import org.antlr.v4.runtime.Token;
 public class ASTFactory {
 
 	public static ClassOrInterface createClass(java.lang.Class jreClass){
+
+		// TODO Inner classes
+
+		var methodSignatures = new HashMap<Pair<String, String>, String>();
+		String classSignature = null;
+
+		// Load class with asm to figure out if there's a JavaTX signature
+		try {
+			var path = jreClass.getName().replace('.', '/') + ".class";
+			var classLoader = jreClass.getClassLoader();
+			if (classLoader != null) {
+				var bytes = IOUtils.toByteArray(Objects.requireNonNull(classLoader.getResourceAsStream(path)));
+				var classReader = new ClassReader(bytes);
+				var classVisitor = new ClassVisitor(Opcodes.ASM7) {
+					String classSignature;
+					@Override
+					public void visitAttribute(Attribute attribute) {
+						if (attribute.type.equals("JavaTXSignature")) {
+							classSignature = ((JavaTXSignatureAttribute) attribute).signature;
+						}
+						super.visitAttribute(attribute);
+					}
+
+					@Override
+					public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
+						classSignature = signature;
+						super.visit(version, access, name, signature, superName, interfaces);
+					}
+
+					@Override
+					public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+
+						methodSignatures.put(new Pair<>(name, descriptor), signature);
+						return new MethodVisitor(Opcodes.ASM7) {
+							@Override
+							public void visitAttribute(Attribute attribute) {
+								if (attribute.type.equals("JavaTXSignature")) {
+									methodSignatures.put(new Pair<>(name, descriptor), ((JavaTXSignatureAttribute) attribute).signature);
+								}
+								super.visitAttribute(attribute);
+							}
+						};
+					}
+				};
+
+				classReader.accept(classVisitor, new Attribute[]{new JavaTXSignatureAttribute()}, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);
+				classSignature = classVisitor.classSignature;
+			}
+		} catch (IOException e) {
+			// Skip
+		}
+
 		JavaClassName name = new JavaClassName(jreClass.getName());
 		List<Method> methoden = new ArrayList<>();
 		List<de.dhbwstuttgart.syntaxtree.Constructor> konstruktoren = new ArrayList<>();
 		for(java.lang.reflect.Constructor constructor : jreClass.getConstructors()){
-			createConstructor(constructor, jreClass).map(c -> konstruktoren.add(c));
+			var signature = methodSignatures.get(new Pair<>(constructor.getName(), org.objectweb.asm.Type.getConstructorDescriptor(constructor)));
+			createConstructor(constructor, signature, jreClass).map(c -> konstruktoren.add(c));
 		}
 		Set<java.lang.reflect.Method> allMethods = new HashSet<>(Arrays.asList(jreClass.getMethods()));
 		Set<java.lang.reflect.Method> allDeclaredMethods = new HashSet<>(Arrays.asList(jreClass.getDeclaredMethods()));
 		Set<java.lang.reflect.Method> allInheritedMethods = new HashSet<>(allMethods);
 		allInheritedMethods.removeAll(allDeclaredMethods);
 		for(java.lang.reflect.Method method : allDeclaredMethods){
-			methoden.add(createMethod(method, jreClass, false));
+			var signature = methodSignatures.get(new Pair<>(method.getName(), org.objectweb.asm.Type.getMethodDescriptor(method)));
+			methoden.add(createMethod(method, signature, jreClass, false));
 		}
 		for(java.lang.reflect.Method method : allInheritedMethods){
-			methoden.add(createMethod(method, jreClass, true));
+			var signature = methodSignatures.get(new Pair<>(method.getName(), org.objectweb.asm.Type.getMethodDescriptor(method)));
+			methoden.add(createMethod(method, signature, jreClass, true));
 		}
 		List<Field> felder = new ArrayList<>();
 		for(java.lang.reflect.Field field : jreClass.getDeclaredFields()){
@@ -72,7 +131,8 @@ public class ASTFactory {
 		for(Type jreInterface : jreClass.getGenericInterfaces()){
 			implementedInterfaces.add((RefType) createType(jreInterface));
 		}
-        GenericDeclarationList genericDeclarationList = createGenerics(jreClass.getTypeParameters(), jreClass, null);
+
+        GenericDeclarationList genericDeclarationList = createGenerics(jreClass.getTypeParameters(), jreClass, null, classSignature);
 
         Token offset = new NullToken(); //Braucht keinen Offset, da diese Klasse nicht aus einem Quellcode geparst wurde
 
@@ -87,7 +147,7 @@ public class ASTFactory {
 	//	return createClass(classType).getType();
 	//}
 
-	private static Optional<de.dhbwstuttgart.syntaxtree.Constructor> createConstructor(Constructor constructor, Class inClass) {
+	private static Optional<de.dhbwstuttgart.syntaxtree.Constructor> createConstructor(Constructor constructor, String signature,  Class inClass) {
 		String name = constructor.getName();
 		RefTypeOrTPHOrWildcardOrGeneric returnType = createType(inClass);
 		Parameter[] jreParams = constructor.getParameters();
@@ -101,7 +161,7 @@ public class ASTFactory {
 		}
 		ParameterList parameterList = new ParameterList(params, new NullToken());
 		Block block = new Block(new ArrayList<Statement>(), new NullToken());
-		GenericDeclarationList gtvDeclarations = createGenerics(constructor.getTypeParameters(), inClass, constructor.getName());
+		GenericDeclarationList gtvDeclarations = createGenerics(constructor.getTypeParameters(), inClass, constructor.getName(), signature);
 		Token offset = new NullToken();
 		int modifier = constructor.getModifiers();
 
@@ -112,7 +172,7 @@ public class ASTFactory {
 		return Optional.of(new de.dhbwstuttgart.syntaxtree.Constructor(modifier, name,returnType, parameterList, block, gtvDeclarations, offset /*, new ArrayList<>() geloescht PL 2018-11-24 */));
 	}
 
-	public static Method createMethod(java.lang.reflect.Method jreMethod, java.lang.Class inClass, Boolean isInherited){
+	public static Method createMethod(java.lang.reflect.Method jreMethod, String signature, java.lang.Class inClass, Boolean isInherited){
 		String name = jreMethod.getName();
 		RefTypeOrTPHOrWildcardOrGeneric returnType;
 		Type jreRetType;
@@ -133,19 +193,142 @@ public class ASTFactory {
 		}
 		ParameterList parameterList = new ParameterList(params, new NullToken());
 		Block block = new Block(new ArrayList<Statement>(), new NullToken());
-        GenericDeclarationList gtvDeclarations = createGenerics(jreMethod.getTypeParameters(), inClass, jreMethod.getName());
+        GenericDeclarationList gtvDeclarations = createGenerics(jreMethod.getTypeParameters(), inClass, jreMethod.getName(), signature);
 		Token offset = new NullToken();
 
 		return new Method(jreMethod.getModifiers(), name,returnType, parameterList, block, gtvDeclarations, offset, isInherited);
 	}
 
-	public static GenericDeclarationList createGenerics(TypeVariable[] typeParameters, Class context, String methodName){
-		List<de.dhbwstuttgart.syntaxtree.GenericTypeVar> gtvs = new ArrayList<>();
-		for(TypeVariable jreTV : typeParameters){
-			de.dhbwstuttgart.syntaxtree.GenericTypeVar gtv = createGeneric(jreTV, jreTV.getName(), context, methodName);
-			gtvs.add(gtv);
+	public static GenericDeclarationList createGenerics(TypeVariable[] typeParameters, Class context, String methodName, String signature) {
+		if (signature == null) {
+			List<de.dhbwstuttgart.syntaxtree.GenericTypeVar> gtvs = new ArrayList<>();
+			for(TypeVariable jreTV : typeParameters){
+				de.dhbwstuttgart.syntaxtree.GenericTypeVar gtv = createGeneric(jreTV, jreTV.getName(), context, methodName);
+				gtvs.add(gtv);
+			}
+			return new GenericDeclarationList(gtvs, new NullToken());
+		} else {
+			var res = createGenerics(signature);
+			return res;
 		}
-		return new GenericDeclarationList(gtvs,new NullToken());
+	}
+
+	public static GenericDeclarationList createGenerics(String signature) {
+		if (signature == null) return new GenericDeclarationList(new ArrayList<>(), new NullToken());
+
+		var gtvs = new ArrayList<GenericTypeVar>();
+		var signatureVisitor = new SignatureVisitor(Opcodes.ASM7) {
+			List<RefTypeOrTPHOrWildcardOrGeneric> bounds = new ArrayList<>();
+			final Stack<RefTypeOrTPHOrWildcardOrGeneric> bound = new Stack<>();
+			final Stack<RefType> classTypes = new Stack<>();
+
+			// All hail the mighty visitor pattern
+			final SignatureVisitor doNothing = new SignatureVisitor(Opcodes.ASM7) {};
+
+			char wildcard = '=';
+
+			@Override
+			public SignatureVisitor visitSuperclass() {
+				return doNothing;
+			}
+
+			@Override
+			public SignatureVisitor visitParameterType() {
+				return doNothing;
+			}
+
+			@Override
+			public SignatureVisitor visitReturnType() {
+				return doNothing;
+			}
+
+			@Override
+			public SignatureVisitor visitExceptionType() {
+				return doNothing;
+			}
+
+			@Override
+			public void visitFormalTypeParameter(String name) {
+				bounds = new ArrayList<>();
+				gtvs.add(new GenericTypeVar(name, bounds, new NullToken(), new NullToken()));
+			}
+
+			@Override
+			public void visitTypeVariable(String name) {
+				var refType = new GenericRefType(name, new NullToken());
+				if (classTypes.isEmpty()) {
+					((List<RefTypeOrTPHOrWildcardOrGeneric>) gtvs.get(gtvs.size() - 1).getBounds()).add(refType);
+				} else {
+					pushType(refType);
+				}
+			}
+
+			@Override
+			public void visitClassType(String name) {
+				var refType = new RefType(new JavaClassName(name.replaceAll("/", ".")), new ArrayList<>(), new NullToken());
+				classTypes.push(refType);
+				pushType(refType);
+			}
+
+			void pushType(RefTypeOrTPHOrWildcardOrGeneric refType) {
+				if (wildcard == SignatureVisitor.SUPER) {
+					bound.push(new SuperWildcardType(refType, new NullToken()));
+				} else if (wildcard == SignatureVisitor.EXTENDS) {
+					bound.push(new ExtendsWildcardType(refType, new NullToken()));
+				} else {
+					bound.push(refType);
+				}
+			}
+
+			@Override
+			public SignatureVisitor visitTypeArgument(char wildcard) {
+				this.wildcard = wildcard;
+				return this;
+ 			}
+
+			boolean equals(RefTypeOrTPHOrWildcardOrGeneric a, RefTypeOrTPHOrWildcardOrGeneric b) {
+				if (b instanceof SuperWildcardType wc)
+					return equals(a, wc.getInnerType());
+				else if (b instanceof ExtendsWildcardType wc)
+					return equals(a, wc.getInnerType());
+				return a == b;
+			}
+
+			@Override
+			public void visitEnd() {
+				wildcard = '=';
+				var classType = (RefType) classTypes.pop();
+				if (!classTypes.isEmpty()) {
+					var next = classTypes.peek();
+					var par = bound.pop();
+					var toAdd = new ArrayList<RefTypeOrTPHOrWildcardOrGeneric>();
+					while (!equals(next, par)) {
+						toAdd.add(par);
+						par = bound.pop();
+					}
+					var element = par;
+					if (par instanceof WildcardType wc) {
+						element = wc.getInnerType();
+					}
+					Collections.reverse(toAdd);
+					((RefType) element).getParaList().addAll(toAdd);
+
+					bound.push(par);
+				} else {
+					if (bound.peek() != classType) {
+						classType.getParaList().add(bound.pop());
+						bounds.add(classType);
+					} else {
+						bounds.add(bound.pop());
+					}
+				}
+			}
+		};
+
+		var sr = new SignatureReader(signature);
+		sr.accept(signatureVisitor);
+
+		return new GenericDeclarationList(gtvs, new NullToken());
 	}
 
 	private static RefTypeOrTPHOrWildcardOrGeneric createType(java.lang.reflect.Type type){

src/main/java/de/dhbwstuttgart/syntaxtree/type/ExtendsWildcardType.java

@@ -5,6 +5,8 @@ import de.dhbwstuttgart.syntaxtree.ASTVisitor;
 import de.dhbwstuttgart.typeinference.result.ResultSetVisitor;
 import org.antlr.v4.runtime.Token;
 
+import java.util.Objects;
+
 /**
  *  Stellt eine Wildcard mit oberer Grenze dar.
  *  z.B. void test(? extends Number var){..}
@@ -54,9 +56,16 @@ public class ExtendsWildcardType extends WildcardType{
 		visitor.visit(this);
 	}
 
+	@Override
+	public int hashCode() {
+		return Objects.hashCode(this.innerType);
+	}
+
 	@Override
 	public boolean equals(Object o) {
-		// TODO Auto-generated method stub
-		return false;
+		if (this == o) return true;
+		if (o == null || getClass() != o.getClass()) return false;
+		ExtendsWildcardType that = (ExtendsWildcardType) o;
+		return that.innerType.equals(this.innerType);
 	}
 }

src/main/java/de/dhbwstuttgart/syntaxtree/type/GenericRefType.java

@@ -4,6 +4,8 @@ import de.dhbwstuttgart.syntaxtree.ASTVisitor;
 import de.dhbwstuttgart.typeinference.result.ResultSetVisitor;
 import org.antlr.v4.runtime.Token;
 
+import java.util.Objects;
+
 public class GenericRefType extends RefTypeOrTPHOrWildcardOrGeneric
 {
     private String name;
@@ -33,14 +35,20 @@ public class GenericRefType extends RefTypeOrTPHOrWildcardOrGeneric
         visitor.visit(this);
     }
 
-	@Override
-	public boolean equals(Object o) {
-		// TODO Auto-generated method stub
-		return false;
-	}
-	
-	    
-	 @Override
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        GenericRefType that = (GenericRefType) o;
+        return name.equals(that.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
+
+    @Override
 	public String toString()
 	{
 		 return "GTV " + this.name;

src/main/java/de/dhbwstuttgart/syntaxtree/type/SuperWildcardType.java

@@ -2,9 +2,12 @@ package de.dhbwstuttgart.syntaxtree.type;
 
 
 import de.dhbwstuttgart.syntaxtree.ASTVisitor;
+import de.dhbwstuttgart.syntaxtree.GenericTypeVar;
 import de.dhbwstuttgart.typeinference.result.ResultSetVisitor;
 import org.antlr.v4.runtime.Token;
 
+import java.util.Objects;
+
 /**
  *  Stellt eine Wildcard mit unterer Grenze dar.
  *  z.B. void test(? super Integer var){..}
@@ -65,9 +68,16 @@ public class SuperWildcardType extends WildcardType{
 		visitor.visit(this);
 	}
 
+	@Override
+	public int hashCode() {
+		return Objects.hashCode(this.innerType);
+	}
+
 	@Override
 	public boolean equals(Object o) {
-		// TODO Auto-generated method stub
-		return false;
+		if (this == o) return true;
+		if (o == null || getClass() != o.getClass()) return false;
+		SuperWildcardType that = (SuperWildcardType) o;
+		return that.innerType.equals(this.innerType);
 	}
 }

src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java

@@ -16,8 +16,10 @@ import de.dhbwstuttgart.target.tree.expression.TargetExpression;
 import de.dhbwstuttgart.target.tree.type.*;
 import de.dhbwstuttgart.typeinference.constraints.Pair;
 import de.dhbwstuttgart.typeinference.result.*;
+import org.objectweb.asm.Attribute;
 
 import java.util.*;
+import java.util.concurrent.CyclicBarrier;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -170,7 +172,6 @@ public class ASTToTargetAST {
                 for (var pair : simplifiedConstraints) {
                     if (pair.left.equals(typeVariable) && typeVariables.contains(pair.right)) {
                         addToPairs(result, new PairTPHsmallerTPH(pair.left, equality.getOrDefault(pair.right, pair.right)));
-                        typeVariables.add(pair.right);
                     }
                 }
             }
@@ -196,7 +197,7 @@ public class ASTToTargetAST {
                     RefTypeOrTPHOrWildcardOrGeneric T2 = superType;
                     if (T2 instanceof TypePlaceholder tph) T2 = equality.getOrDefault(tph, tph);
 
-                    System.out.println("T1s: " + T1s + "\nT2: " + T2);
+                    System.out.println("T1s: " + T1s + " T2: " + T2);
                     //Ende
 
                     superType = methodCall.receiverType;
@@ -211,7 +212,7 @@ public class ASTToTargetAST {
                             var optMethod = findMethod(owner, methodCall.name, methodCall.getArgumentList());
                             if (optMethod.isEmpty()) return;
                             var method = optMethod.get();
-                            var generics = generics(owner, method).javaGenerics();
+                            var generics = generics(owner, method).txGenerics();
 
                             // transitive and
                             var all = transitiveClosure(generics);
@@ -226,24 +227,24 @@ public class ASTToTargetAST {
 
                             // Loop from hell
                             outer:
-                            for (var tph : typeVariables) {
-                                if (typeVariablesOfClass.contains(tph)) continue;
+                            for (var R1 : typeVariables) {
+                                if (typeVariablesOfClass.contains(R1)) continue;
                                 for (var generic : all) {
                                     if (!(generic.getRight() instanceof TypePlaceholder type))
                                         continue;
 
                                     for (var pair : simplifiedConstraints) {
-                                        if (!(pair.left.equals(tph) && pair.right.equals(generic.getLeft())))
+                                        if (!(pair.left.equals(R1) && pair.right.equals(generic.getLeft())))
                                             continue;
 
-                                        for (var tph2 : typeVariables) {
+                                        for (var R2 : typeVariables) {
                                             for (var pair2 : simplifiedConstraints) {
-                                                if (!(pair2.right.equals(tph2) && pair2.left.equals(type)))
+                                                if (!(pair2.right.equals(R2) && pair2.left.equals(type)))
                                                     continue;
-                                                if (tph.equals(tph2)) continue;
-                                                if (!T1s.contains(tph) || !tph2.equals(T2)) continue;
+                                                if (R1.equals(R2)) continue;
+                                                if (!T1s.contains(R1) || !R2.equals(T2)) continue;
 
-                                                var newPair = new PairTPHsmallerTPH(tph, tph2);
+                                                var newPair = new PairTPHsmallerTPH(R1, R2);
                                                 newPairs.add(newPair);
 
                                                 if (!containsRelation(result, newPair))
@@ -268,7 +269,7 @@ public class ASTToTargetAST {
 
                 @Override
                 public void visit(Assign assign) {
-                    superType = assign.lefSide.getType();
+                    superType = assign.rightSide.getType();
                     assign.rightSide.accept(this);
                 }
 
@@ -521,9 +522,6 @@ public class ASTToTargetAST {
                     super.visit(methodCall);
                     typeVariables.addAll(findTypeVariables(methodCall.getType(), equality));
                 }
-
-                @Override
-                public void visit(Assign assign) {}
             });
         }
 
@@ -554,10 +552,11 @@ public class ASTToTargetAST {
             methodFindConstraints(owner, method, simplifiedConstraints, txTypeVariables, classGenerics.userDefinedGenerics, txTypeVariablesOfClass, txResult, txEquality);
 
             {   // Java Generics
+                eliminateTransitives(javaResult);
                 var referenced = new HashSet<TypePlaceholder>();
 
                 eliminateCycles(javaResult, equality, referenced);
-                eliminateInfima(javaResult, equality, referenced);
+                eliminateInfima(javaResult, equality);
 
                 var usedTphs = new HashSet<TypePlaceholder>();
                 // For eliminating inner type variables we need to figure out which ones are actually used
@@ -571,11 +570,13 @@ public class ASTToTargetAST {
                 eliminateInnerTypeVariables(referenced, javaResult);
                 equalizeTypeVariables(javaResult, equality);
                 usedTPHsOfMethods.put(method, usedTphs);
+                addMissingObjectBounds(javaResult, genericsOfClass);
             }
             {
                 var referenced = new HashSet<TypePlaceholder>();
                 // JavaTX Generics
-                eliminateInfima(txResult, txEquality, referenced);
+                eliminateTransitives(txResult);
+                eliminateInfima(txResult, txEquality);
 
                 for (var param : method.getParameterList().getFormalparalist()) {
                     referenced.addAll(findTypeVariables(param.getType(), txEquality));
@@ -584,12 +585,36 @@ public class ASTToTargetAST {
                 referenced.addAll(txTypeVariablesOfClass);
 
                 eliminateInnerTypeVariables(referenced, txResult);
+                addMissingObjectBounds(txResult, txGenericsOfClass);
             }
 
             System.out.println(method.name + ": " + txResult + " & " + javaResult);
             return generics;
         }
 
+        private void eliminateChain(Set<ResultPair<?, ?>> result, List<TypePlaceholder> chain) {
+            for (var pair : new HashSet<>(result)) {
+                if (pair instanceof PairTPHsmallerTPH ptph && chain.get(chain.size() - 1).equals(ptph.left)) {
+                    if (chain.contains(ptph.right)) return;
+                    var copy = new ArrayList<>(chain);
+                    copy.add(ptph.right);
+                    if (copy.size() > 2)
+                        result.remove(new PairTPHsmallerTPH(chain.get(0), ptph.right));
+                    eliminateChain(result, copy);
+                }
+            }
+        }
+
+        void eliminateTransitives(Set<ResultPair<?,?>> result) {
+            for (var pair : new HashSet<>(result)) if (pair instanceof PairTPHsmallerTPH ptph) {
+                var first = ptph.left;
+                var chain = new ArrayList<TypePlaceholder>();
+                chain.add(ptph.left);
+                chain.add(ptph.right);
+                eliminateChain(result, chain);
+            }
+        }
+
         void findAllBounds(RefTypeOrTPHOrWildcardOrGeneric type, Set<ResultPair<?, ?>> generics, Map<TypePlaceholder, TypePlaceholder> equality) {
             if (type instanceof TypePlaceholder tph) {
                 tph = equality.getOrDefault(tph, tph);
@@ -634,34 +659,86 @@ public class ASTToTargetAST {
                 findAllBounds(field.getType(), txResult, txEquality);
             }
 
+            eliminateTransitives(javaResult);
+            eliminateTransitives(txResult);
+            System.out.println(javaResult);
             var referenced = new HashSet<TypePlaceholder>();
             eliminateCycles(javaResult, equality, referenced);
-            eliminateInfima(javaResult, equality, referenced);
+            eliminateInfima(javaResult, equality);
             var txReferenced = new HashSet<TypePlaceholder>();
-            eliminateInfima(txResult, txEquality, txReferenced);
+            eliminateInfima(txResult, txEquality);
 
             eliminateInnerTypeVariablesOfClass(classOrInterface, javaResult, equality, referenced);
             equalizeTypeVariables(javaResult, equality);
             eliminateInnerTypeVariablesOfClass(classOrInterface, txResult, txEquality, txReferenced);
 
+            addMissingObjectBounds(javaResult, null);
+            addMissingObjectBounds(txResult, null);
+
             System.out.println("Class " + classOrInterface.getClassName().getClassName() + ": " + txResult + ", " + javaResult);
             return generics;
         }
 
+        void addMissingObjectBounds(Set<ResultPair<?,?>> result, Set<ResultPair<?, ?>> filter) {
+            outer: for (var p1 : new HashSet<>(result)) {
+                if (p1 instanceof PairTPHsmallerTPH ptph) {
+                    for (var p2 : new HashSet<>(result)) {
+                        if (ptph.right.equals(p2.getLeft()))
+                            continue outer;
+                    }
+                    if (filter == null || filter.stream().noneMatch((pair) -> pair.getLeft().equals(ptph.right)))
+                        result.add(new PairTPHequalRefTypeOrWildcardType(ptph.right, OBJECT));
+                }
+            }
+        }
+
         void equalizeTypeVariables(Set<ResultPair<?, ?>> input, Map<TypePlaceholder, TypePlaceholder> equality) {
-            System.out.println(input);
             for (var pair : new HashSet<>(input)) {
                 if (pair instanceof PairTPHsmallerTPH ptph) {
-                    System.out.println(pair + " " + ptph.left.getVariance() + " " + ptph.right.getVariance());
-                    if (ptph.left.getVariance() == 1 && ptph.right.getVariance() == -1) {
-                        addToEquality(equality, ptph.left, ptph.right);
-                        input.remove(ptph);
-                        for (var pair2 : new HashSet<>(simplifiedConstraints)) {
-                            if (pair2.right.equals(ptph.left)) {
-                                simplifiedConstraints.remove(pair2);
-                                simplifiedConstraints.add(new PairTPHsmallerTPH(pair2.left, ptph.right));
+                    var chain = new ArrayList<TypePlaceholder>();
+                    chain.add(ptph.left);
+                    chain.add(ptph.right);
+
+                    outer: while (true) {
+                        var added = false;
+                        for (var pair2 : input) {
+                            if (pair2 instanceof PairTPHsmallerTPH ptph2 && ptph2.left.equals(chain.get(chain.size() - 1))) {
+                                if (chain.contains(ptph2.right)) break outer;
+                                chain.add(ptph2.right);
+                                added = true;
                             }
                         }
+                        if (!added) break;
+                    }
+
+                    var variance = chain.get(0).getVariance();
+                    if (variance != 1) continue;
+                    var index = 0;
+                    for (var tph : chain) {
+                        if (variance == 1 && tph.getVariance() == -1) {
+                            variance = -1;
+                        }
+                        if (variance == -1 && tph.getVariance() == 1) {
+                            break;
+                        }
+                        index++;
+                    }
+                    if (variance == 1) continue;
+
+                    var start = chain.get(0);
+                    var prev = start;
+                    for (var i = 1; i < index; i++) {
+                        var cur = chain.get(i);
+                        addToEquality(equality, cur, start);
+                        input.remove(new PairTPHsmallerTPH(prev, chain.get(i)));
+                        for (var pair2 : new HashSet<>(input)) {
+                            // TODO Maybe this would be unnecessary if we were to add the = constraints later on
+                            if (pair2 instanceof PairTPHequalRefTypeOrWildcardType && pair2.getLeft().equals(cur)) {
+                                input.remove(pair2);
+                                input.add(new PairTPHequalRefTypeOrWildcardType(start, pair2.getRight()));
+                            }
+                        }
+                        prev = chain.get(i);
                     }
                 }
             }
@@ -739,6 +816,15 @@ public class ASTToTargetAST {
             var cycles = findCycles(input);
             for (var cycle : cycles) {
                 var newTph = TypePlaceholder.fresh(new NullToken());
+                var variance = cycle.get(0).getVariance();
+                for (var tph : cycle) {
+                    if (tph.getVariance() != variance) {
+                        variance = 0;
+                        break;
+                    }
+                }
+                newTph.setVariance(variance);
+
                 referenced.add(newTph);
                 addToPairs(input, new PairTPHequalRefTypeOrWildcardType(newTph, OBJECT));
                 cycle.add(cycle.get(0)); // Make it a complete cycle
@@ -752,7 +838,7 @@ public class ASTToTargetAST {
             }
         }
 
-        void eliminateInfima(Set<ResultPair<?, ?>> input, Map<TypePlaceholder, TypePlaceholder> equality, Set<TypePlaceholder> referenced) {
+        void eliminateInfima(Set<ResultPair<?, ?>> input, Map<TypePlaceholder, TypePlaceholder> equality) {
             var foundInfima = false;
             do {
                 foundInfima = false;
@@ -767,7 +853,16 @@ public class ASTToTargetAST {
                     if (infima.size() > 1) {
                         foundInfima = true;
                         var newTph = TypePlaceholder.fresh(new NullToken());
-                        referenced.add(newTph);
+                        var variance = infima.stream().findFirst().get().right.getVariance();
+                        for (var pair : infima) {
+                            if (pair.right.getVariance() != variance) {
+                                variance = 0;
+                                break;
+                            }
+                        }
+                        newTph.setVariance(variance);
+
+                        //referenced.add(newTph);
                         addToPairs(input, new PairTPHsmallerTPH(left, newTph));
                         input.removeAll(infima);
                         for (var infimum : infima) {

src/main/java/de/dhbwstuttgart/target/tree/TargetMethod.java

@@ -22,11 +22,15 @@ public record TargetMethod(int access, String name, TargetBlock block, Signature
     }
 
     public static String getSignature(Set<TargetGeneric> generics, List<MethodParameter> parameters, TargetType returnType) {
-        String ret = "<";
-        for (var generic : generics) {
-            ret += generic.name() + ":" + generic.bound().toDescriptor();
+        String ret = "";
+        if (generics.size() > 0) {
+            ret += "<";
+            for (var generic : generics) {
+                ret += generic.name() + ":" + generic.bound().toDescriptor();
+            }
+            ret += ">";
         }
-        ret += ">(";
+        ret += "(";
         for (var param : parameters) {
             ret += param.type().toDescriptor();
         }

src/main/java/de/dhbwstuttgart/util/Pair.java

@@ -1,5 +1,6 @@
 package de.dhbwstuttgart.util;
 
+import java.util.Objects;
 import java.util.Optional;
 
 public class Pair<T, T1> {
@@ -22,4 +23,17 @@ public class Pair<T, T1> {
     public String toString() {
     	return "(" + key.toString() + "," + value.toString() + ")\n";
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) o;
+        return Objects.equals(key, pair.key) && Objects.equals(value, pair.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(key, value);
+    }
 }

src/test/java/GenericsParserTest.java

@@ -0,0 +1,105 @@
+import de.dhbwstuttgart.parser.NullToken;
+import de.dhbwstuttgart.parser.SyntaxTreeGenerator.GenericContext;
+import de.dhbwstuttgart.parser.scope.JavaClassName;
+import de.dhbwstuttgart.syntaxtree.GenericDeclarationList;
+import de.dhbwstuttgart.syntaxtree.GenericTypeVar;
+import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
+import de.dhbwstuttgart.syntaxtree.type.*;
+import de.dhbwstuttgart.target.generate.ASTToTargetAST;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class GenericsParserTest {
+
+    @Test
+    public void testMethodNoGenerics() {
+        var signature = "()V";
+        var generics = ASTFactory.createGenerics(signature);
+        assertEquals(generics, new GenericDeclarationList(List.of(), new NullToken()));
+    }
+
+    @Test
+    public void testMethodSimpleGenerics() {
+        var signature = "<T:Ljava/lang/Object;>()V";
+        var generics = ASTFactory.createGenerics(signature);
+        assertEquals(generics, new GenericDeclarationList(
+                List.of(new GenericTypeVar("T", List.of(ASTToTargetAST.OBJECT), new NullToken(), new NullToken())), new NullToken())
+        );
+    }
+
+    @Test
+    public void testMethodExtends() {
+        var signature = "<T:Ljava/lang/Class<TT;>;>()V";
+        var generics = ASTFactory.createGenerics(signature);
+        assertEquals(generics, new GenericDeclarationList(
+                List.of(new GenericTypeVar("T", List.of(
+                            new RefType(new JavaClassName("java.lang.Class"), List.of(new GenericRefType("T", new NullToken())), new NullToken())),
+                        new NullToken(), new NullToken())), new NullToken()
+                )
+        );
+    }
+
+    @Test
+    public void testMethodVariance() {
+        var signature = "<T:Ljava/lang/Class<+TT;>;>()V";
+        var generics = ASTFactory.createGenerics(signature);
+
+        assertEquals(generics, new GenericDeclarationList(
+                List.of(new GenericTypeVar("T", List.of(
+                        new RefType(new JavaClassName("java.lang.Class"), List.of(
+                                new ExtendsWildcardType(new GenericRefType("T", new NullToken()), new NullToken())
+                        ), new NullToken())),
+                        new NullToken(), new NullToken())),
+                new NullToken())
+        );
+    }
+
+    @Test
+    public void testMethodTypeVars() {
+        var signature = "<A:TB;B:LClassA;C:LClassB<TA;>;D:TB;>()V";
+        var generics = ASTFactory.createGenerics(signature);
+        assertEquals(generics, new GenericDeclarationList(
+                List.of(
+                        new GenericTypeVar("A", List.of(new GenericRefType("B", new NullToken())), new NullToken(), new NullToken()),
+                        new GenericTypeVar("B", List.of(new RefType(new JavaClassName("ClassA"), new NullToken())), new NullToken(), new NullToken()),
+                        new GenericTypeVar("C", List.of(new RefType(new JavaClassName("ClassB"),
+                                List.of(new GenericRefType("A", new NullToken())),
+                                new NullToken())), new NullToken(), new NullToken()
+                        ),
+                        new GenericTypeVar("D", List.of(new GenericRefType("B", new NullToken())), new NullToken(), new NullToken())
+                ),
+                new NullToken()
+        ));
+    }
+
+    @Test
+    public void testMethodComplex() {
+        var signature = "<T:LClassA<+TT;LClassB<+LClassA;-LClassC<LClassA;>;>;>;U:LClassC<LClassC;>;>()V";
+        var generics = ASTFactory.createGenerics(signature);
+
+        assertEquals(generics, new GenericDeclarationList(
+                List.of(new GenericTypeVar("T", List.of(
+                        new RefType(new JavaClassName("ClassA"), List.of(
+                                new ExtendsWildcardType(new GenericRefType("T", new NullToken()), new NullToken()),
+                                new RefType(new JavaClassName("ClassB"), List.of(
+                                        new ExtendsWildcardType(new RefType(new JavaClassName("ClassA"), new NullToken()), new NullToken()),
+                                        new SuperWildcardType(
+                                                new RefType(new JavaClassName("ClassC"), List.of(
+                                                        new RefType(new JavaClassName("ClassA"), new NullToken())
+                                                ), new NullToken()), new NullToken())
+                                ), new NullToken())
+                        ), new NullToken())
+                ), new NullToken(), new NullToken()),
+                        new GenericTypeVar("U", List.of(
+                                new RefType(new JavaClassName("ClassC"), List.of(
+                                        new RefType(new JavaClassName("ClassC"), new NullToken())
+                                ), new NullToken())
+                        ), new NullToken(), new NullToken())),
+                new NullToken()
+        ));
+    }
+}

src/test/java/targetast/TestComplete.java

@@ -575,6 +575,11 @@ public class TestComplete {
         assertEquals(fstArgm2, m2.getGenericReturnType());
     }
 
+    @Test
+    public void testTXGenerics() throws Exception {
+        var classFiles = generateClassFiles(new ByteArrayClassLoader(), "TXGenerics.jav");
+        var instance = classFiles.get("TXGenerics").getDeclaredConstructor().newInstance();
+    }
 
     @Test
     public void typedIdTest() throws Exception {

src/test/java/targetast/TestGenerics.java

@@ -90,16 +90,15 @@ public class TestGenerics {
 
         var generics = result.genericsResults.get(0);
         assertEquals(0, generics.get(result.clazz).size());
-        assertEquals(2, generics.get(m).size());
+        assertEquals(1, generics.get(m).size());
         assertEquals(2, generics.get(main).size());
 
         var N = generics.getBounds(m.getParameterList().getParameterAt(0).getType(), result.clazz, m);
-        var NChain = new BoundsList(new Bound(true, ASTToTargetAST.OBJECT));
-        assertEquals(N, NChain);
+        var N2 = generics.getBounds(m.getReturnType(), result.clazz, m);
 
-        var Q = generics.getBounds(m.getReturnType(), result.clazz, m);
-        var QChain = new BoundsList(new Bound(true, TypePlaceholder.of("N")), new Bound(true, ASTToTargetAST.OBJECT));
-        assertEquals(Q, QChain);
+        var NChain = new BoundsList(new Bound(true, ASTToTargetAST.OBJECT));
+        assertEquals(N, N2);
+        assertEquals(N2, NChain);
 
         var R = generics.getBounds(main.getParameterList().getParameterAt(0).getType(), result.clazz, main);
         assertEquals(R, NChain);
@@ -304,17 +303,18 @@ public class TestGenerics {
         var main = result.findMethod("main");
 
         var generics = result.genericsResults.get(0);
-        var Q = generics.getBounds(id.getReturnType(), result.clazz, id);
-        var N = generics.getBounds(id.getParameterList().getParameterAt(0).getType(), result.clazz, id);
-        assertEquals(Q, new BoundsList(new Bound(true, ASTToTargetAST.OBJECT)));
-        assertEquals(N, new BoundsList(new Bound(true, TypePlaceholder.of("Q")), new Bound(true, ASTToTargetAST.OBJECT)));
+        var O = generics.getBounds(id.getReturnType(), result.clazz, id);
+        var O2 = generics.getBounds(id.getParameterList().getParameterAt(0).getType(), result.clazz, id);
+        assertEquals(O, O2);
+        assertEquals(O2, new BoundsList(new Bound(true, ASTToTargetAST.OBJECT)));
 
-        var Q2 = generics.getBounds(main.getReturnType(), result.clazz, main);
-        var R = generics.getBounds(main.getParameterList().getParameterAt(0).getType(), result.clazz, main);
-        var S = generics.getBounds(main.getParameterList().getParameterAt(1).getType(), result.clazz, main);
-        assertEquals(Q2, new BoundsList(new Bound(true, ASTToTargetAST.OBJECT)));
-        assertEquals(R, new BoundsList(new Bound(true, TypePlaceholder.of("Q")), new Bound(true, ASTToTargetAST.OBJECT)));
-        assertEquals(S, new BoundsList(new Bound(true, TypePlaceholder.of("Q")), new Bound(true, ASTToTargetAST.OBJECT)));
+        // TODO Maybe test in other ways if the parameter generics equals the return generics
+        var S = generics.getBounds(main.getReturnType(), result.clazz, main);
+        var S2 = generics.getBounds(main.getParameterList().getParameterAt(0).getType(), result.clazz, main);
+        var T = generics.getBounds(main.getParameterList().getParameterAt(1).getType(), result.clazz, main);
+        assertEquals(S, S2);
+        assertEquals(S2, new BoundsList(new Bound(true, ASTToTargetAST.OBJECT)));
+        assertEquals(T, new BoundsList(new Bound(true, ASTToTargetAST.OBJECT)));
     }
 
     @Test