Merge remote-tracking branch 'origin/master'

src/main/java/Compiler.java

@@ -79,40 +79,6 @@ public class Compiler {
             System.out.println(refType.name);
         }
 
-//
-//        List<FieldDecl> fieldDecls = new ArrayList<>();
-//
-//        FieldDecl fieldDecl = new FieldDecl("int", "i");
-//        fieldDecls.add(fieldDecl);
-//
-////        FieldDecl fieldDecl2 = new FieldDecl("char", "i");
-////        fieldDecls.add(fieldDecl2);
-//
-//        List<MethodDecl> methodDecls = new ArrayList<>();
-//
-//
-//        MethodDecl methodDecl = new MethodDecl("ClassA", "int", "m", new ParameterList(new ArrayList<>()), new BlockStatement(new ArrayList<>(), "void"));
-//        methodDecls.add(methodDecl);
-//
-////        MethodDecl methodDecl2 = new MethodDecl("ClassA", "int", "m", new ArrayList<>(), new ArrayList<>());
-////        methodDecls.add(methodDecl2);
-//
-//        abstractSyntaxTree.classes.add(new RefType("MyClass", fieldDecls, methodDecls, false));
-//
-//        System.out.println("Parsed " + abstractSyntaxTree.classes.size() + " classes with identifiers/names:");
-//        for (RefType refType : abstractSyntaxTree.classes) {
-//            System.out.println(refType.name);
-//        }
-
-
-        IfElseStatement c = (IfElseStatement) abstractSyntaxTree.classes.get(0).methodDecls.get(0).codeBlock.statements.get(2);
-        InstVarExpression d = (InstVarExpression) c.condition;
-        d.classRef = abstractSyntaxTree.classes.get(0);
-
-
-        AssignStatementExpression a = (AssignStatementExpression) abstractSyntaxTree.classes.get(0).methodDecls.get(0).codeBlock.statements.get(1);
-        InstVarExpression b = (InstVarExpression) a.left;
-        b.classRef = abstractSyntaxTree.classes.get(0);
         abstractSyntaxTree.typeCheck();
 
         abstractSyntaxTree.codeGen();

src/main/java/Input.java

@@ -1,15 +1,24 @@
-class Example {
+class Example1 {
     int i;
     boolean b;
     char c;
     int m(int n){
-        int localA;
+        Example e = new Example();
-        this.b = true;
+        e.m(1);
-        if(this.b){
+        return 0;
+    }
+}
+
+class Example {
+    int i;
+    boolean b;
+    char c;
+    int m(int a){
+        int localA = 0;
+        boolean localB = true;
+        if(localB){
             localA = 7;
-        }else{
+        }else{}
-            localA = 5;
-        }
         return localA;
     }
-}
+}

src/main/java/TypeCheck/TypeCheckException.java

@@ -0,0 +1,7 @@
+package TypeCheck;
+
+public class TypeCheckException extends Exception {
+    public TypeCheckException(String message) {
+        super(message);
+    }
+}

src/main/java/TypeCheck/TypeCheckHelper.java

@@ -4,23 +4,19 @@ import java.util.List;
 import java.util.Objects;
 
 public class TypeCheckHelper {
-    public String upperBound(String type1, String type2) throws Exception{
+    public String upperBound(String type1, String type2) throws TypeCheckException{
-        if(Objects.equals(type1, "boolean"))
+        boolean type1Primitiv = Objects.equals(type1, "boolean") || Objects.equals(type1, "int") || Objects.equals(type1, "char");
-            type1 = "bool";
+        boolean type2Primitiv = Objects.equals(type2, "boolean") || Objects.equals(type2, "int") || Objects.equals(type2, "char");
-        if (Objects.equals(type2, "boolean"))
-            type2 = "bool";
-        boolean type1Primitiv = Objects.equals(type1, "bool") || Objects.equals(type1, "int") || Objects.equals(type1, "char");
-        boolean type2Primitiv = Objects.equals(type2, "bool") || Objects.equals(type2, "int") || Objects.equals(type2, "char");
 
         String result;
         if(type1Primitiv && type2Primitiv){
             if(Objects.equals(type1, type2)){
                 result = type1;
             }else{
-                throw new Exception("no upper bound");
+                throw new TypeCheckException("There is no upper bound.");
             }
         }else if(type1Primitiv || type2Primitiv){
-            throw new Exception("no upper bound");
+            throw new TypeCheckException("There is no upper bound.");
         }else{
             result = "class";
         }

src/main/java/abstractSyntaxTree/Class/FieldDecl.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Class;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Node;
@@ -23,7 +24,7 @@ public class FieldDecl extends AbstractType implements Node {
         this.type = type;
         this.identifier = identifier;
     }
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, String>> typeContext) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, String>> typeContext) throws TypeCheckException {
 
         TypeCheckResult result = new TypeCheckResult();
 

src/main/java/abstractSyntaxTree/Class/MethodDecl.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Class;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Node;
 import abstractSyntaxTree.Parameter.Parameter;
@@ -33,7 +34,7 @@ public class MethodDecl implements Node {
         this.localVars = new LinkedHashMap<>();
     }
 
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext) throws TypeCheckException {
         // jede methode als block statement aufrufen und jede neue locale varibale in localvars schreiben
         List<Parameter> parametersList = parameters.parameterList;
         for(Parameter parameter : parametersList){
@@ -43,7 +44,7 @@ public class MethodDecl implements Node {
         TypeCheckResult result = new TypeCheckResult();
         String CodeBlockType = codeBlock.typeCheck(methodContext, typeContext, localVars).type;
         if(!Objects.equals(this.returnType, CodeBlockType))
-            throw new Exception("TypeCheck Exception: Method retruns wrong type");
+            throw new TypeCheckException("Method returns " + CodeBlockType + ", but should retrun " + this.returnType + ". ");
         result.type = codeBlock.returnType;
         return result;
     }

src/main/java/abstractSyntaxTree/Class/RefType.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Class;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Expression.IExpression;
 import abstractSyntaxTree.Node;
@@ -34,14 +35,14 @@ public class RefType extends AbstractType implements Node {
     }
 
     public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext,
-                                     HashMap<String, HashMap<String, String>> typeContext) throws Exception {
+                                     HashMap<String, HashMap<String, String>> typeContext) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         // check if field with the same identifier is defined more than once
         List<String> discoveredFieldIdentifiers = new ArrayList<>();
         for (FieldDecl fieldDecl : fieldDecls) {
             if(discoveredFieldIdentifiers.contains(fieldDecl.identifier)){
-                throw new Exception("A field with the identifier " + fieldDecl.identifier + " was defined more than once in the same class.");
+                throw new TypeCheckException("A field with the identifier " + fieldDecl.identifier + " was defined more than once in the class " + this.name + ". ");
             }
             discoveredFieldIdentifiers.add(fieldDecl.identifier);
         }
@@ -58,7 +59,7 @@ public class RefType extends AbstractType implements Node {
 
             if (discoveredMethods.containsKey(methodDecl.returnType)) {
                 if(discoveredMethods.get(methodDecl.returnType).equals(methodDecl.name)){
-                    throw new Exception("A method with the name " + methodDecl.name + " and return type " + methodDecl.returnType + " was defined more than once in the same class.");
+                    throw new TypeCheckException("A method with the name " + methodDecl.name + " and return type " + methodDecl.returnType + " was defined more than once in the same class.");
                 }
             }
            discoveredMethods.put(methodDecl.returnType, methodDecl.name);

src/main/java/abstractSyntaxTree/Datatype/BoolDatatype.java

@@ -17,10 +17,10 @@ public class BoolDatatype extends AbstractType implements IDatatype{
         return (Objects.equals(value, boolDatatype.value));
     }
     @Override
-    public TypeCheckResult typeCheck() throws Exception {
+    public TypeCheckResult typeCheck() {
         TypeCheckResult result = new TypeCheckResult();
 
-        result.type = "bool";
+        result.type = "boolean";
 
         setTypeCheckResult(result);
         return result;

src/main/java/abstractSyntaxTree/Datatype/CharDatatype.java

@@ -10,7 +10,7 @@ public class CharDatatype extends AbstractType implements IDatatype{
     char value;
 
     @Override
-    public TypeCheckResult typeCheck() throws Exception {
+    public TypeCheckResult typeCheck() {
         TypeCheckResult result = new TypeCheckResult();
 
         result.type = "char";

src/main/java/abstractSyntaxTree/Datatype/IDatatype.java

@@ -1,11 +1,12 @@
 package abstractSyntaxTree.Datatype;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import org.objectweb.asm.MethodVisitor;
 
 public interface IDatatype {
     // typeCheck method
-    TypeCheckResult typeCheck() throws Exception;
+    TypeCheckResult typeCheck() throws TypeCheckException;
 
     // visit method for code generation
 

src/main/java/abstractSyntaxTree/Datatype/IntDatatype.java

@@ -10,7 +10,7 @@ import java.util.Objects;
 public class IntDatatype extends AbstractType implements IDatatype{
     int value;
     @Override
-    public TypeCheckResult typeCheck() throws Exception {
+    public TypeCheckResult typeCheck() {
         TypeCheckResult result = new TypeCheckResult();
 
         result.type = "int";
@@ -19,9 +19,6 @@ public class IntDatatype extends AbstractType implements IDatatype{
         return result;
     }
 
-    // visit method for code generation
-
-
     @Override
     public void codeGen(MethodVisitor mv) throws Exception {
         

src/main/java/abstractSyntaxTree/Expression/BinaryExpression.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Expression;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.AbstractType;
@@ -24,7 +25,7 @@ public class BinaryExpression extends AbstractType implements IExpression{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckHelper helper = new TypeCheckHelper();
         TypeCheckResult result = new TypeCheckResult();
 
@@ -163,7 +164,7 @@ public class BinaryExpression extends AbstractType implements IExpression{
                 break;
 
             default:
-                throw new Exception("Unknown operator: " + operator);
+                throw new TypeCheckException("The operator " + operator + " is not known.");
         }
 
         mv.visitLabel(operationFalse);

src/main/java/abstractSyntaxTree/Expression/BooleanConstantExpression.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Expression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Parameter.ParameterList;
 import org.objectweb.asm.MethodVisitor;
@@ -16,9 +17,9 @@ public class BooleanConstantExpression extends AbstractType implements IExpressi
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) {
         TypeCheckResult result = new TypeCheckResult();
-        result.type = "bool";
+        result.type = "boolean";
         setTypeCheckResult(result);
         return result;
     }

src/main/java/abstractSyntaxTree/Expression/CharConstantExpression.java

@@ -16,7 +16,7 @@ public class CharConstantExpression extends AbstractType implements IExpression{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) {
         TypeCheckResult result = new TypeCheckResult();
         result.type = "char";
         setTypeCheckResult(result);

src/main/java/abstractSyntaxTree/Expression/IExpression.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Expression;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Node;
 import abstractSyntaxTree.Parameter.ParameterList;
@@ -11,7 +12,7 @@ import java.util.LinkedHashMap;
 public interface IExpression extends Node {
     // typeCheck method
     //TypeCheckResult typeCheck() throws Exception;
-    TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception;
+    TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException;
 
     // visit method for code generation
     void codeGen(MethodVisitor mv, LinkedHashMap<String, String> localVars, HashMap<String, HashMap<String, String>> typeContext) throws Exception;

src/main/java/abstractSyntaxTree/Expression/InstVarExpression.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Expression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Class.RefType;
 import abstractSyntaxTree.Parameter.ParameterList;
@@ -30,10 +31,11 @@ public class InstVarExpression extends AbstractType implements IExpression{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
-
-        //todo ///////////////////
         String varType = typeContext.get(classRef.name).get(fieldName);
+        if (varType == null) {
+            throw new TypeCheckException("Field " + fieldName + " was not found in class " + classRef.name + ".");
+        }
         TypeCheckResult result = new TypeCheckResult();
         result.type = varType;
         return result;

src/main/java/abstractSyntaxTree/Expression/IntConstantExpression.java

@@ -18,7 +18,7 @@ public class IntConstantExpression extends AbstractType implements IExpression{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) {
         TypeCheckResult result = new TypeCheckResult();
         result.type = "int";
         setTypeCheckResult(result);

src/main/java/abstractSyntaxTree/Expression/LocalVarIdentifier.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Expression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import org.objectweb.asm.*;
@@ -25,12 +26,12 @@ public class LocalVarIdentifier extends AbstractType implements IExpression{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
        TypeCheckResult result = new TypeCheckResult();
         if (localVars.containsKey(identifier)) {
             result.type = localVars.get(identifier);
         } else {
-            throw new Exception("TypeCheck Exception: Local var " + identifier + " does not exist.");
+            throw new TypeCheckException("Local var " + identifier + " does not exist.");
         }
         setTypeCheckResult(result);
         return result;

src/main/java/abstractSyntaxTree/Expression/UnaryExpression.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Expression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Datatype.IDatatype;
@@ -20,7 +21,7 @@ public class UnaryExpression extends AbstractType implements IExpression{
         this.operand = operand;
     }
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         TypeCheckResult operandTypeCheckResult = operand.typeCheck();

src/main/java/abstractSyntaxTree/Program.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Class.FieldDecl;
 import abstractSyntaxTree.Class.MethodDecl;
@@ -27,7 +28,7 @@ public class Program implements Node {
     }
 
 
-    public TypeCheckResult typeCheck() throws Exception{
+    public TypeCheckResult typeCheck() throws TypeCheckException {
         this.typeContext = new HashMap<>();
         this.methodContext = new HashMap<>();
 

src/main/java/abstractSyntaxTree/Statement/BlockStatement.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Statement;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import TypeCheck.AbstractType;
 import abstractSyntaxTree.Class.FieldDecl;
@@ -28,7 +29,7 @@ public class BlockStatement extends AbstractType implements IStatement {
     @Override
     public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext,
                                      HashMap<String, HashMap<String, String>> typeContext,
-                                     HashMap<String, String> localVars) throws Exception {
+                                     HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         this.localVars = localVars;
@@ -54,10 +55,10 @@ public class BlockStatement extends AbstractType implements IStatement {
 
                 if (!firstType.equals(this.returnType) || !firstType.equals(this.returnType)) {
                     if (!firstType.equals("void") && this.returnType != null) {
-                        throw new Exception("TypeCheck Exception: if paths return wrong type");
+                        throw new TypeCheckException("The if-Path returns the wrong type.");
                     }
                     if (!secondType.equals("void") && this.returnType != null) {
-                        throw new Exception("TypeCheck Exception: else paths return wrong type");
+                        throw new TypeCheckException("The else-path returns the wrong type.");
                     }
                     boolean firstIsVoid = firstType.equals("void");
 
@@ -78,11 +79,9 @@ public class BlockStatement extends AbstractType implements IStatement {
                 this.returnType = typeOfCurrentStatement.type;
 
             if (!typeOfCurrentStatement.type.equals(this.returnType))
-                throw new Exception("TypeCheck Exception: Block returns the wrong type.");
+                throw new TypeCheckException("At least some statements of the block returns the wrong type or missing return statement.");
         }
         result.type = this.returnType;
-        // todo check if the block returns the needed return type in every case
-        // todo ignore unreachable statements?
         setTypeCheckResult(result);
         return result;
     }

src/main/java/abstractSyntaxTree/Statement/EmptyStatement.java

@@ -13,7 +13,7 @@ import java.util.Objects;
 public class EmptyStatement  extends AbstractType implements IStatement{
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) {
         TypeCheckResult result = new TypeCheckResult();
         result.type = "void";
         return result;

src/main/java/abstractSyntaxTree/Statement/IStatement.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Statement;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Node;
 import abstractSyntaxTree.Parameter.ParameterList;
@@ -11,7 +12,7 @@ import java.util.List;
 
 public interface IStatement extends Node {
 
-    TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception;
+    TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException;
 
     void codeGen(MethodVisitor mv, LinkedHashMap<String, String> localVars, HashMap<String, HashMap<String, String>> typeContext) throws Exception;
     TypeCheckResult getTypeCheckResult();

src/main/java/abstractSyntaxTree/Statement/IfElseStatement.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Statement;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import TypeCheck.AbstractType;
 import abstractSyntaxTree.Expression.IExpression;
@@ -24,13 +25,13 @@ public class IfElseStatement extends AbstractType implements IStatement{
 
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         TypeCheckResult conditionType = condition.typeCheck(methodContext, typeContext, localVars);
 
         if (!conditionType.type.equals("boolean")) {
-            throw new IllegalArgumentException("should be boolean");
+            throw new TypeCheckException("The condition of a if statement is " + conditionType.type + ", but should be boolean.");
         }
 
         TypeCheckResult ifStatementType = ifStatement.typeCheck(methodContext, typeContext, localVars);
@@ -38,7 +39,7 @@ public class IfElseStatement extends AbstractType implements IStatement{
 
         if (!ifStatementType.type.equals(elseStatementType.type)) {
             if(ifStatementType.type != "void" && elseStatementType.type != "void")
-                throw new IllegalArgumentException("TypeCeck Exception: if and else have different types");
+                throw new TypeCheckException("If- and else-path return different not-void types.");
         }
 
         result.type = ifStatementType.type + "," + elseStatementType.type;

src/main/java/abstractSyntaxTree/Statement/IfStatement.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Statement;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import TypeCheck.AbstractType;
 import abstractSyntaxTree.Expression.IExpression;
@@ -23,13 +24,13 @@ public class IfStatement extends AbstractType implements IStatement{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         TypeCheckResult conditionType = condition.typeCheck(methodContext, typeContext, localVars);
 
-        if (!conditionType.equals("bool")) {
+        if (!conditionType.type.equals("boolean")) {
-            throw new Exception("TypeCheck Exception: Condition of If-Statement should be bool.");
+            throw new TypeCheckException("Condition of If-Statement should is " + conditionType.type + ", but should be boolean.");
         }
 
         TypeCheckResult ifStatementType = ifStatement.typeCheck(methodContext, typeContext, localVars);

src/main/java/abstractSyntaxTree/Statement/LocalVarDecl.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.Statement;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Parameter.ParameterList;
@@ -17,7 +18,7 @@ public class LocalVarDecl extends AbstractType implements IStatement{
         this.identifier = identifier;
     }
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckHelper.typeExists(this.type, new ArrayList<>(methodContext.keySet()));
 
         localVars.put(this.identifier, this.type);

src/main/java/abstractSyntaxTree/Statement/ReturnStatement.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Statement;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import TypeCheck.AbstractType;
 import abstractSyntaxTree.Expression.IExpression;
@@ -19,7 +20,7 @@ public class ReturnStatement extends AbstractType implements IStatement{
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         if (expression == null) {
@@ -45,7 +46,7 @@ public class ReturnStatement extends AbstractType implements IStatement{
             //TODO: Resolve how do we get the type of the expression
             String type = expression.getTypeCheckResult().type;
 
-            if (type.equals("int") || type.equals("bool") || type.equals("char")) {
+            if (type.equals("int") || type.equals("boolean") || type.equals("char")) {
                 mv.visitInsn(Opcodes.IRETURN);
             } else {
                 mv.visitInsn(Opcodes.ARETURN);

src/main/java/abstractSyntaxTree/Statement/WhileStatement.java

@@ -1,5 +1,6 @@
 package abstractSyntaxTree.Statement;
 
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import TypeCheck.AbstractType;
 import abstractSyntaxTree.Expression.IExpression;
@@ -21,12 +22,12 @@ public class WhileStatement extends AbstractType implements IStatement {
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         // check condition
         TypeCheckResult conditionType = condition.typeCheck(methodContext, typeContext, localVars);
-        if (!conditionType.equals("bool")) {
+        if (!conditionType.type.equals("boolean")) {
             throw new IllegalArgumentException("Expected boolean");
         }
 

src/main/java/abstractSyntaxTree/StatementExpression/AssignStatementExpression.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.StatementExpression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Expression.IExpression;
@@ -28,7 +29,7 @@ public class AssignStatementExpression extends AbstractType implements IExpressi
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckHelper helper = new TypeCheckHelper();
         TypeCheckResult result = new TypeCheckResult();
 
@@ -48,7 +49,7 @@ public class AssignStatementExpression extends AbstractType implements IExpressi
         if(Objects.equals(leftType.type, "boolean"))
             leftType.type = "bool";
         if (!Objects.equals(upperbound, leftType.type)) {
-            throw new Exception("TypeCheck Exception: upper bound of assignment is not left type");
+            throw new TypeCheckException("The upper bound of assignment is not the left type.");
         }
         result.type = "void";
         setTypeCheckResult(result);

src/main/java/abstractSyntaxTree/StatementExpression/MethodCallStatementExpression.java

@@ -1,12 +1,14 @@
 package abstractSyntaxTree.StatementExpression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Class.MethodDecl;
 import abstractSyntaxTree.Class.RefType;
 import abstractSyntaxTree.Expression.IExpression;
 import abstractSyntaxTree.Parameter.ParameterList;
 import abstractSyntaxTree.Statement.IStatement;
+import jdk.jshell.spi.ExecutionControl;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
@@ -28,7 +30,8 @@ public class MethodCallStatementExpression extends AbstractType implements IExpr
         this.arguments = arguments;
     }
 
-    public TypeCheckResult typeCheck() throws Exception {
+    @Override
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
         TypeCheckResult result = new TypeCheckResult();
 
         RefType searchMethodHere;
@@ -41,18 +44,12 @@ public class MethodCallStatementExpression extends AbstractType implements IExpr
         List<MethodDecl> methods = searchMethodHere.methodDecls;
 
         if(!methods.contains(methodName)){
-            throw new Exception("method not found");
+            throw new TypeCheckException("The method " + methodName + " is called, but does not exist.");
         }
 
         return result;
     }
 
-
-    @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
-        return null;
-    }
-
     //Errors occur due to the change in parameter in the RefType class
     // I need the methodContext here to get the method descriptor
     @Override

src/main/java/abstractSyntaxTree/StatementExpression/NewStatementExpression.java

@@ -1,6 +1,7 @@
 package abstractSyntaxTree.StatementExpression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckException;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Expression.IExpression;
@@ -26,14 +27,16 @@ public class NewStatementExpression extends AbstractType implements IExpression,
     }
 
     @Override
-    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws TypeCheckException {
+        //todo testen wenn in ast vorhanden
         if(!TypeCheckHelper.typeExists(className, new ArrayList<>(typeContext.keySet()))){
-            throw new Exception("TypeCheck Exception: An instance of " + className + " is created, but the type does not exist.");
+            throw new TypeCheckException("An instance of " + className + " is created, but the type does not exist.");
         }
         TypeCheckResult result = new TypeCheckResult();
         result.type = className;
         setTypeCheckResult(result);
         return result;
+
     }
 
     @Override

src/main/java/abstractSyntaxTree/StatementExpression/Receiver.java

@@ -1,7 +1,16 @@
 package abstractSyntaxTree.StatementExpression;
 
+import TypeCheck.TypeCheckException;
+import TypeCheck.TypeCheckResult;
+import abstractSyntaxTree.Expression.IExpression;
 import abstractSyntaxTree.Expression.InstVarExpression;
 import abstractSyntaxTree.Node;
+import abstractSyntaxTree.Parameter.ParameterList;
+import abstractSyntaxTree.Statement.IStatement;
+import org.objectweb.asm.MethodVisitor;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
 
 public class Receiver implements Node {
     boolean thisExpression;
@@ -24,6 +33,7 @@ public class Receiver implements Node {
     public Receiver(String identifier) {
         this.identifier = identifier;
     }
+
 }