Some changes

src/main/java/ast/statementexpressions/AssignableNode.java

@@ -2,6 +2,7 @@ package ast.statementexpressions;
 
 import ast.expressions.unaryexpressions.MemberAccessNode;
 import ast.type.type.ITypeNode;
+import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import semantic.TypeCheckResult;
 

src/main/java/ast/statements/BlockNode.java

@@ -1,5 +1,6 @@
 package ast.statements;
 
+import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import semantic.TypeCheckResult;
 import visitor.Visitable;
@@ -22,4 +23,9 @@ public class BlockNode implements IStatementNode, Visitable {
         return visitor.analyze(this);
     }
 
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
+    }
+
 }

src/main/java/ast/statements/ElseNode.java

@@ -1,5 +1,6 @@
 package ast.statements;
 
+import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import semantic.TypeCheckResult;
 

src/main/java/ast/statements/IfElseNode.java

@@ -1,5 +1,6 @@
 package ast.statements;
 
+import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import semantic.TypeCheckResult;
 
@@ -20,6 +21,11 @@ public class IfElseNode implements IStatementNode {
         elseIfStatements.add(elseIfStament);
     }
 
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
+    }
+
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return visitor.analyze(this);

src/main/java/ast/statements/WhileNode.java

@@ -1,6 +1,7 @@
 package ast.statements;
 
 import ast.expressions.IExpressionNode;
+import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import semantic.TypeCheckResult;
 
@@ -17,6 +18,11 @@ public class WhileNode implements IStatementNode {
 
     }
 
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
+    }
+
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
         return visitor.analyze(this);

src/main/java/bytecode/MethodCodeGen.java

@@ -16,6 +16,8 @@ import ast.statementexpressions.crementexpressions.DecrementNode;
 import ast.statementexpressions.crementexpressions.IncrementNode;
 import ast.statementexpressions.methodcallstatementnexpressions.MethodCallNode;
 import ast.statements.*;
+import ast.type.AccessModifierNode;
+import ast.type.EnumAccessModifierNode;
 import ast.type.ValueNode;
 import ast.type.type.BaseType;
 import ast.type.type.ReferenceType;
@@ -78,8 +80,10 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
     @Override
     public void visit(MainMethodNode mainMethodNode) {
-        methodVisitor = classWriter.visitMethod(mapper.mapAccessTypeToOpcode(mainMethodNode.accesModifier),
-                mainMethodNode.getIdentifier(),
+        AccessModifierNode accessModifierNode = new AccessModifierNode("");
+        accessModifierNode.accessType = EnumAccessModifierNode.PUBLIC_STATIC;
+        methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC,
+                "main",
                 "([Ljava/lang/String;)V",
                 null,
                 null);
@@ -318,9 +322,17 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
     // Statements
 
+    @Override
+    public void visit(BlockNode blockNode) {
+        for(IStatementNode statementNode : blockNode.statements) {
+            statementNode.accept(this);
+        }
+    }
+
     @Override
     public void visit(IfElseNode ifElseNode) {
         Label elseLabel = new Label();
+        Label endLabel = new Label();
 
         Label[] elseIfLabels = new Label[ifElseNode.elseIfStatements.size()];
         for (int i = 0; i < ifElseNode.elseIfStatements.size(); i++) {
@@ -338,7 +350,6 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
         ifElseNode.ifStatement.block.accept(this); // accept if block
 
-        Label endLabel = new Label();
         methodVisitor.visitJumpInsn(GOTO, endLabel);
 
         for (int i = 0; i < ifElseNode.elseIfStatements.size(); i++) {
@@ -357,6 +368,8 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
         if (ifElseNode.elseStatement != null) {
             methodVisitor.visitLabel(elseLabel);
             ifElseNode.elseStatement.block.accept(this);
+        } else {
+            methodVisitor.visitLabel(elseLabel);
         }
 
         methodVisitor.visitLabel(endLabel);

src/main/java/bytecode/visitor/MethodVisitor.java

@@ -43,6 +43,7 @@ public interface MethodVisitor {
     void visit(UnaryNode unaryExpressionNode);
 
     // statements
+    void visit(BlockNode blockNode);
     void visit(IfElseNode ifElseNode);
 
     void visit(IncrementNode incrementNode);