.idea/misc.xml

@@ -40,7 +40,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_22" default="true" project-jdk-name="openjdk-22" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="openjdk-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

src/main/java/CompilerInput.txt

@@ -1,7 +1,13 @@
 public class Example {
+
     public int testVar;
+
     public static int testMethod(char b){
+
          int a;
-         a = 3;
+         int a;
+
+
     }
+
 }

src/main/java/Main.java

@@ -1,6 +1,9 @@
 import ast.ASTNode;
 import org.antlr.v4.runtime.*;
 import org.antlr.v4.runtime.Token;
+import ast.ClassNode;
+import ast.ProgramNode;
+import bytecode.ByteCodeGenerator;
 import org.antlr.v4.runtime.CharStream;
 import org.antlr.v4.runtime.CharStreams;
 import org.antlr.v4.runtime.tree.ParseTree;
@@ -20,13 +23,12 @@ public class Main {
     public static void main(String[] args) throws Exception {
         try {
             CharStream codeCharStream = CharStreams.fromPath(Paths.get("src/main/java/CompilerInput.txt"));
-            parsefile(codeCharStream);
+            parseFile(codeCharStream);
         } catch (IOException e) {
             System.err.println("Error reading the file: " + e.getMessage());
         }
     }
 
-
     static void parsefile(CharStream codeCharStream) {
         /* ------------------------- Scanner -> tokens ------------------------- */
         SimpleJavaLexer lexer = new SimpleJavaLexer(codeCharStream);
@@ -39,7 +41,8 @@ public class Main {
         for (Token token : tokens) {
             String tokenType = SimpleJavaLexer.VOCABULARY.getSymbolicName(token.getType());
             String tokenText = token.getText();
-           // System.out.println("Token Type: " + tokenType + ", Token Text: " + tokenText);
+            // System.out.println("Token Type: " + tokenType + ", Token Text: " +
+            // tokenText);
             System.out.println(tokenType + " " + tokenText);
         }
         System.out.println();
@@ -53,6 +56,7 @@ public class Main {
         System.out.println(parseTree.toStringTree(parser));
         printTree(parseTree, parser, 0);
         System.out.println();
+        ProgramNode typedAst = (ProgramNode) SemanticAnalyzer.generateTast(ast);
 
         /* ------------------------- AST builder -> AST ------------------------- */
         ASTBuilder astBuilder = new ASTBuilder();
@@ -64,26 +68,32 @@ public class Main {
         printAST(abstractSyntaxTree, 0);
         System.out.println();
 
-        /* ------------------------- Semantic Analyzer -> Tast ------------------------- */
+        /*
+         * ------------------------- Semantic Analyzer -> Tast -------------------------
+         */
         SemanticAnalyzer.generateTast(abstractSyntaxTree);
 
         // Printing the Tast
         System.out.println("Tast generated");
 
-        /* ------------------------- Bytecode Generator -> Bytecode ------------------------- */
+        /*
+         * ------------------------- Bytecode Generator -> Bytecode
+         * -------------------------
+         */
         ByteCodeGenerator byteCodeGenerator = new ByteCodeGenerator();
         byteCodeGenerator.generateByteCode(abstractSyntaxTree);
         System.out.println("Bytecode generated");
 
     }
 
-
     /**
      * This method is used to print the parse tree in a structured format.
-     * It recursively traverses the tree and prints the rule names and text of the nodes.
+     * It recursively traverses the tree and prints the rule names and text of the
+     * nodes.
      *
      * @param tree   The parse tree to be printed.
-     * @param parser The parser used to parse the input. It's used to get the rule names.
+     * @param parser The parser used to parse the input. It's used to get the rule
+     *               names.
      * @param indent The current indentation level. It's used to format the output.
      */
     public static void printTree(ParseTree tree, Parser parser, int indent) {
@@ -102,19 +112,20 @@ public class Main {
             System.out.println(indentString + tree.getText());
         }
 
-        // Recursively print the children of the current node, increasing the indentation level
+        // Recursively print the children of the current node, increasing the
+        // indentation level
         for (int i = 0; i < tree.getChildCount(); i++) {
             printTree(tree.getChild(i), parser, indent + 1);
         }
     }
 
-
     public static void printAST(ASTNode node, int indent) {
         String indentString = " ".repeat(indent * 2);
         System.out.println(indentString + node.getClass().toString());
 
-        for (ASTNode child : node.) {
+        // for (ASTNode child : node.) {
-            printAST(child, indent + 1);
+        // printAST(child, indent + 1);
-        }
+        // }
+        byteCodeGenerator.visit(typedAst);
     }
 }

src/main/java/ast/ASTNode.java

@@ -1,6 +1,6 @@
 package ast;
 
-public class ASTNode {
+public interface ASTNode {
 
 }
 

src/main/java/ast/ClassNode.java

@@ -7,11 +7,13 @@ import ast.type.EnumAccessTypeNode;
 
 import java.util.ArrayList;
 import java.util.List;
+
+import bytecode.visitor.ClassVisitor;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
-import typechecker.Visitable;
+import visitor.Visitable;
 
-public class ClassNode extends ASTNode implements Visitable {
+public class ClassNode implements ASTNode, Visitable {
     public String identifier;
     public AccessTypeNode accessType;
     public List<MemberNode> members = new ArrayList<>();
@@ -38,6 +40,11 @@ public class ClassNode extends ASTNode implements Visitable {
 
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.typeCheck(this);
+        return visitor.analyze(this);
+    }
+
+    @Override
+    public void accept(ClassVisitor classVisitor) {
+        classVisitor.visit(this);
     }
 }

src/main/java/ast/LiteralNode.java

@@ -1,8 +1,10 @@
 package ast;
 
 import ast.expression.ExpressionNode;
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
 
-public class LiteralNode extends ExpressionNode {
+public class LiteralNode implements ExpressionNode {
 
   int value;
   private String type;
@@ -20,4 +22,8 @@ public class LiteralNode extends ExpressionNode {
   }
 
 
+  @Override
+  public TypeCheckResult accept(SemanticVisitor visitor) {
+    return null;
+  }
 }

src/main/java/ast/ProgramNode.java

@@ -2,11 +2,13 @@ package ast;
 
 import java.util.ArrayList;
 import java.util.List;
+
+import bytecode.visitor.ProgramVisitor;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
-import typechecker.Visitable;
+import visitor.Visitable;
 
-public class ProgramNode extends ASTNode implements Visitable{
+public class ProgramNode implements ASTNode, Visitable{
     public List<ClassNode> classes = new ArrayList<>();
 
     public void addClass(ClassNode classNode) {
@@ -15,6 +17,11 @@ public class ProgramNode extends ASTNode implements Visitable{
 
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.typeCheck(this);
+        return visitor.analyze(this);
+    }
+
+    @Override
+    public void accept(ProgramVisitor programVisitor) {
+        programVisitor.visit(this);
     }
 }

src/main/java/ast/VarNode.java

@@ -1,6 +1,10 @@
 package ast;
 
-public class VarNode extends ASTNode{
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
+import visitor.Visitable;
+
+public class VarNode implements ASTNode, Visitable {
 
   private String identifier;
   private String type;
@@ -18,4 +22,8 @@ public class VarNode extends ASTNode{
     return identifier;
   }
 
+  @Override
+  public TypeCheckResult accept(SemanticVisitor visitor) {
+    return visitor.analyze(this);
+  }
 }

src/main/java/ast/expression/BinaryExpressionNode.java

@@ -1,6 +1,10 @@
 package ast.expression;
 
-public class BinaryExpressionNode extends ExpressionNode {
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
+import visitor.Visitable;
+
+public class BinaryExpressionNode implements ExpressionNode, Visitable {
     public ExpressionNode left;
     public ExpressionNode right;
     public String operator;  // Stores the operator as a string (e.g., "+", "-", "&&")
@@ -10,4 +14,9 @@ public class BinaryExpressionNode extends ExpressionNode {
         this.right = right;
         this.operator = operator;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/expression/ExpressionNode.java

@@ -1,9 +1,8 @@
 package ast.expression;
 
 import ast.ASTNode;
+import visitor.Visitable;
 
-public class ExpressionNode extends ASTNode {
+public interface ExpressionNode extends ASTNode, Visitable {
-
-
 
 }

src/main/java/ast/expression/IdentifierExpressionNode.java

@@ -1,9 +1,22 @@
 package ast.expression;
 
-public class IdentifierExpressionNode extends ExpressionNode {
+import ast.type.TypeNode;
+import semantic.SemanticVisitor;
+
+import typechecker.TypeCheckResult;
+import visitor.Visitable;
+
+public class IdentifierExpressionNode implements ExpressionNode, Visitable {
     public String name;
+    public TypeNode type;
+
 
     public IdentifierExpressionNode(String name) {
         this.name = name;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/expression/UnaryExpressionNode.java

@@ -1,6 +1,10 @@
 package ast.expression;
 
-public class UnaryExpressionNode extends ExpressionNode {
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
+import visitor.Visitable;
+
+public class UnaryExpressionNode implements ExpressionNode, Visitable {
     public ExpressionNode expression;
     public String operator;  // Stores the operator (e.g., "-", "!")
 
@@ -8,4 +12,9 @@ public class UnaryExpressionNode extends ExpressionNode {
         this.expression = expression;
         this.operator = operator;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/member/ConstructorNode.java

@@ -1,9 +1,16 @@
 package ast.member;
 
 import ast.type.AccessTypeNode;
+import bytecode.visitor.MethodVisitor;
+import visitor.Visitable;
 
-public class ConstructorNode extends MethodNode {
+public class ConstructorNode extends MethodNode implements Visitable {
     public ConstructorNode(AccessTypeNode visibility, String name) {
         super(visibility, name);
     }
+
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
+    }
 }

src/main/java/ast/member/FieldNode.java

@@ -2,11 +2,12 @@ package ast.member;
 
 import ast.type.AccessTypeNode;
 import ast.type.TypeNode;
+import bytecode.visitor.ClassVisitor;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
-import typechecker.Visitable;
+import visitor.Visitable;
 
-public class FieldNode extends MemberNode implements Visitable {
+public class FieldNode implements MemberNode, Visitable {
     public AccessTypeNode accessTypeNode;
     public TypeNode type;
     public String identifier;
@@ -19,6 +20,11 @@ public class FieldNode extends MemberNode implements Visitable {
 
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.typeCheck(this);
+        return visitor.analyze(this);
+    }
+
+    @Override
+    public void accept(ClassVisitor classVisitor) {
+        classVisitor.visit(this);
     }
 }

src/main/java/ast/member/MemberNode.java

@@ -2,5 +2,5 @@ package ast.member;
 
 import ast.ASTNode;
 
-public class MemberNode extends ASTNode {
+public interface MemberNode extends ASTNode {
 }

src/main/java/ast/member/MethodNode.java

@@ -3,15 +3,17 @@ package ast.member;
 import ast.parameter.ParameterListNode;
 import ast.statement.StatementNode;
 import ast.type.AccessTypeNode;
-import ast.type.TypeNode;
 
 import java.util.ArrayList;
 import java.util.List;
+
+import ast.type.TypeNode;
+import bytecode.visitor.MethodVisitor;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
-import typechecker.Visitable;
+import visitor.Visitable;
 
-public class MethodNode extends MemberNode implements Visitable {
+public class MethodNode implements MemberNode, Visitable {
     public AccessTypeNode visibility;
     public TypeNode type;
     public String identifier;
@@ -36,6 +38,11 @@ public class MethodNode extends MemberNode implements Visitable {
 
     @Override
     public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.typeCheck(this);
+        return visitor.analyze(this);
+    }
+
+    @Override
+    public void accept(MethodVisitor methodVisitor) {
+        methodVisitor.visit(this);
     }
 }

src/main/java/ast/parameter/ParameterListNode.java

@@ -5,7 +5,7 @@ import ast.ASTNode;
 import java.util.ArrayList;
 import java.util.List;
 
-public class ParameterListNode extends ASTNode {
+public class ParameterListNode implements ASTNode {
     List<ParameterNode> parameters = new ArrayList<>();
 
     public ParameterListNode(List<ParameterNode> parameters){

src/main/java/ast/parameter/ParameterNode.java

@@ -3,7 +3,7 @@ package ast.parameter;
 import ast.ASTNode;
 import ast.type.TypeNode;
 
-public class ParameterNode extends ASTNode {
+public class ParameterNode implements ASTNode {
     public TypeNode type;
     public String identifier;
 

src/main/java/ast/statement/AssignmentStatementNode.java

@@ -4,7 +4,7 @@ import ast.VarNode;
 import ast.expression.ExpressionNode;
 import semantic.SemanticVisitor;
 import typechecker.TypeCheckResult;
-import typechecker.Visitable;
+import visitor.Visitable;
 
 public class AssignmentStatementNode extends StatementNode implements Visitable {
   public VarNode varNode;
@@ -17,6 +17,6 @@ public class AssignmentStatementNode extends StatementNode implements Visitable
 
   @Override
   public TypeCheckResult accept(SemanticVisitor visitor) {
-    return visitor.typeCheck(this);
+    return visitor.analyze(this);
   }
 }

src/main/java/ast/statement/IfStatementNode.java

@@ -1,6 +1,8 @@
 package ast.statement;
 
 import ast.expression.ExpressionNode;
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
 
 public class IfStatementNode extends StatementNode {
     public ExpressionNode condition;
@@ -12,4 +14,9 @@ public class IfStatementNode extends StatementNode {
         this.thenStatement = thenStatement;
         this.elseStatement = elseStatement;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/statement/ReturnStatementNode.java

@@ -1,6 +1,8 @@
 package ast.statement;
 
 import ast.expression.ExpressionNode;
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
 
 public class ReturnStatementNode extends StatementNode {
     public ExpressionNode expression;
@@ -8,4 +10,9 @@ public class ReturnStatementNode extends StatementNode {
     public ReturnStatementNode(ExpressionNode expression) {
         this.expression = expression;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/statement/StatementNode.java

@@ -1,7 +1,8 @@
 package ast.statement;
 
 import ast.ASTNode;
+import visitor.Visitable;
 
-public abstract class StatementNode extends ASTNode {
+public abstract class StatementNode implements ASTNode, Visitable {
 }
 

src/main/java/ast/statement/VariableDeclarationStatementNode.java

@@ -1,7 +1,9 @@
 package ast.statement;
 
-import ast.type.TypeNode;
 import ast.expression.ExpressionNode;
+import ast.type.TypeNode;
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
 
 public class VariableDeclarationStatementNode extends StatementNode {
     public TypeNode type;
@@ -12,4 +14,9 @@ public class VariableDeclarationStatementNode extends StatementNode {
         this.identifier = identifier;
         this.expression = expression;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/statement/WhileStatementNode.java

@@ -1,6 +1,8 @@
 package ast.statement;
 
 import ast.expression.ExpressionNode;
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
 
 public class WhileStatementNode extends StatementNode {
     public ExpressionNode condition;
@@ -10,4 +12,9 @@ public class WhileStatementNode extends StatementNode {
         this.condition = condition;
         this.body = body;
     }
+
+    @Override
+    public TypeCheckResult accept(SemanticVisitor visitor) {
+        return visitor.analyze(this);
+    }
 }

src/main/java/ast/type/AccessTypeNode.java

@@ -2,7 +2,7 @@ package ast.type;
 
 import ast.ASTNode;
 
-public class AccessTypeNode extends ASTNode {
+public class AccessTypeNode implements ASTNode {
     public EnumAccessTypeNode enumAccessTypeNode;
 
     public AccessTypeNode(EnumAccessTypeNode enumAccessTypeNode) {

src/main/java/ast/type/BaseTypeNode.java

@@ -0,0 +1,13 @@
+package ast.type;
+
+import ast.ASTNode;
+
+public class BaseTypeNode implements ASTNode, TypeNode {
+
+    public EnumTypeNode enumType;
+
+    public BaseTypeNode(EnumTypeNode enumType) {
+        this.enumType = enumType;
+    }
+
+}

src/main/java/ast/type/ReferenceTypeNode.java

@@ -0,0 +1,6 @@
+package ast.type;
+
+import ast.ASTNode;
+
+public class ReferenceTypeNode implements ASTNode, TypeNode {
+}

src/main/java/ast/type/TypeNode.java

@@ -2,10 +2,5 @@ package ast.type;
 
 import ast.ASTNode;
 
-public class TypeNode extends ASTNode {
+public interface TypeNode extends ASTNode {
-    public EnumTypeNode enumTypeNode;
-
-    public TypeNode(EnumTypeNode enumTypeNode) {
-        this.enumTypeNode = enumTypeNode;
-    }
 }

src/main/java/bytecode/ByteCodeGenerator.java

@@ -2,13 +2,15 @@ package bytecode;
 
 import ast.ProgramNode;
 import ast.ClassNode;
+import bytecode.visitor.ProgramVisitor;
 
-public class ByteCodeGenerator {
+public class ByteCodeGenerator implements ProgramVisitor {
 
-  public void generateByteCode(ProgramNode ast) {
+  @Override
-    for (ClassNode classDeclarationNode : ast.classes) {
+  public void visit(ProgramNode programNode) {
+    for (ClassNode classDeclarationNode : programNode.classes) {
       ClassCodeGen classCodeGen = new ClassCodeGen();
-      classCodeGen.generateClassCode(classDeclarationNode);
+      classDeclarationNode.accept(classCodeGen);
     }
   }
 }

src/main/java/bytecode/ClassCodeGen.java

@@ -4,6 +4,8 @@ import ast.ClassNode;
 import ast.member.FieldNode;
 import ast.member.MemberNode;
 import ast.member.MethodNode;
+import ast.type.BaseTypeNode;
+import bytecode.visitor.ClassVisitor;
 import java.io.File;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.Opcodes;
@@ -11,20 +13,22 @@ import org.objectweb.asm.Opcodes;
 import java.io.FileOutputStream;
 import java.io.IOException;
 
-public class ClassCodeGen {
+public class ClassCodeGen implements ClassVisitor {
-    public void generateClassCode(ClassNode classNode) {
-        ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
     Mapper mapper = new Mapper();
+    ClassWriter classWriter;
+
+    @Override
+    public void visit(ClassNode classNode) {
+        classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
         classWriter.visit(Opcodes.V1_8, mapper.mapAccesTypeToOpcode(classNode.accessType), classNode.identifier, null,
                 "java/lang/Object", null);
 
         for (MemberNode memberNode : classNode.members) {
             if (memberNode instanceof FieldNode) {
-                FieldCodeGen fieldCodeGen = new FieldCodeGen();
+                visit((FieldNode) memberNode);
-                fieldCodeGen.generateFieldCode(classWriter, (FieldNode) memberNode);
             } else if (memberNode instanceof MethodNode) {
-                MethodCodeGen methodCodeGen = new MethodCodeGen();
+                MethodCodeGen methodCodeGen = new MethodCodeGen(classWriter);
-                methodCodeGen.generateMethodCode(classWriter, (MethodNode) memberNode);
+                ((MethodNode) memberNode).accept(methodCodeGen);
             }
         }
 
@@ -34,6 +38,14 @@ public class ClassCodeGen {
         classWriter.visitEnd();
     }
 
+    @Override
+    public void visit(FieldNode fieldNode) {
+        if(fieldNode.type instanceof BaseTypeNode baseTypeNode){
+            classWriter.visitField(mapper.mapAccesTypeToOpcode(fieldNode.accessTypeNode), fieldNode.identifier, mapper.getTypeChar(baseTypeNode.enumType), null, null );
+        }
+        classWriter.visitEnd();
+    }
+
     private void printIntoClassFile(byte[] byteCode, String name) {
         String directoryPath = "src/main/java/classFileOutput";
         File directory = new File(directoryPath);

src/main/java/bytecode/Mapper.java

@@ -1,8 +1,8 @@
 package bytecode;
 
-import ast.type.AccessTypeNode;
+import ast.type.*;
-import ast.type.EnumAccessTypeNode;
 import org.objectweb.asm.Opcodes;
+import ast.type.BaseTypeNode;
 
 public class Mapper {
     public int mapAccesTypeToOpcode(AccessTypeNode type) {
@@ -14,4 +14,26 @@ public class Mapper {
         }
         return 0;
     }
+
+    public String generateMethodDescriptor(BaseTypeNode baseTypeNode) {
+        String descriptor = "()";
+        descriptor += getTypeChar(baseTypeNode.enumType);
+        return descriptor;
+    }
+
+    public String getTypeChar(EnumTypeNode enumTypeNode) {
+        String typeChar = "";
+        switch (enumTypeNode) {
+            case EnumTypeNode.INT:
+                typeChar = "I";
+                break;
+            case EnumTypeNode.CHAR:
+                typeChar = "C";
+                break;
+            case EnumTypeNode.BOOLEAN:
+                typeChar = "Z";
+                break;
+        }
+        return typeChar;
+    }
 }

src/main/java/bytecode/MethodCodeGen.java

@@ -1,17 +1,40 @@
 package bytecode;
 
+import ast.member.ConstructorNode;
 import ast.member.MethodNode;
+import ast.type.BaseTypeNode;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.MethodVisitor;
 
-public class MethodCodeGen {
+public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
-    public void generateMethodCode(ClassWriter classWriter, MethodNode methodNode) {
+
+    private ClassWriter classWriter;
     Mapper mapper = new Mapper();
+
+    public MethodCodeGen(ClassWriter classWriter) {
+        this.classWriter = classWriter;
+    }
+
+    @Override
+    public void visit(ConstructorNode constructorNode) {
         MethodVisitor constructor =
-                classWriter.visitMethod(mapper.mapAccesTypeToOpcode(methodNode.visibility),
+                classWriter.visitMethod(mapper.mapAccesTypeToOpcode(constructorNode.visibility),
                         "<init>",
                         "()V",
                         null,
                         null);
+        constructor.visitEnd();
+    }
+
+    @Override
+    public void visit(MethodNode methodNode) {
+        if(methodNode.type instanceof BaseTypeNode baseTypeNode){
+            MethodVisitor method = classWriter.visitMethod(mapper.mapAccesTypeToOpcode(methodNode.visibility),
+                    methodNode.identifier,
+                    mapper.generateMethodDescriptor(baseTypeNode),
+                    null,
+                    null);
+            method.visitEnd();
+        }
     }
 }

src/main/java/bytecode/visitor/ClassVisitor.java

@@ -0,0 +1,10 @@
+package bytecode.visitor;
+
+import ast.ClassNode;
+import ast.member.FieldNode;
+import org.objectweb.asm.ClassWriter;
+
+public interface ClassVisitor {
+  void visit(ClassNode classNode);
+  void visit(FieldNode fieldNode);
+}

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

@@ -0,0 +1,9 @@
+package bytecode.visitor;
+
+import ast.member.ConstructorNode;
+import ast.member.MethodNode;
+
+public interface MethodVisitor {
+    void visit(ConstructorNode constructorNode);
+    void visit(MethodNode methodNode);
+}

src/main/java/bytecode/visitor/ProgramVisitor.java

@@ -0,0 +1,7 @@
+package bytecode.visitor;
+
+import ast.ProgramNode;
+
+public interface ProgramVisitor {
+  void visit(ProgramNode programNode);
+}

src/main/java/parser/ASTBuilder.java

@@ -11,15 +11,14 @@ import ast.member.MethodNode;
 import ast.parameter.ParameterListNode;
 import ast.parameter.ParameterNode;
 import ast.statement.*;
-import ast.type.AccessTypeNode;
+import ast.type.*;
-import ast.type.EnumAccessTypeNode;
-import ast.type.EnumTypeNode;
-import ast.type.TypeNode;
 import org.antlr.v4.runtime.tree.TerminalNode;
+
 import java.util.ArrayList;
 import java.util.List;
 import parser.generated.*;
 import parser.generated.SimpleJavaParser.LiteralContext;
+import ast.type.BaseTypeNode;
 
 public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
     @Override
@@ -77,9 +76,9 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitParameter(SimpleJavaParser.ParameterContext ctx) {
-        TypeNode type = (TypeNode) visit(ctx.type());
+        TypeNode typeNode = (TypeNode) visit(ctx.type());
         String identifier = ctx.IDENTIFIER().getText();
-        return new ParameterNode(type, identifier);
+        return new ParameterNode(typeNode, identifier);
     }
 
     @Override
@@ -87,11 +86,11 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
         String typeStr = ctx.getText();
         switch (typeStr) {
             case "int":
-                return new TypeNode(EnumTypeNode.INT);
+                return new BaseTypeNode(EnumTypeNode.INT);
             case "boolean":
-                return new TypeNode(EnumTypeNode.BOOLEAN);
+                return new BaseTypeNode(EnumTypeNode.BOOLEAN);
             case "char":
-                return new TypeNode(EnumTypeNode.CHAR);
+                return new BaseTypeNode(EnumTypeNode.CHAR);
             default:
                 throw new IllegalArgumentException("Unsupported type: " + typeStr);
         }
@@ -207,6 +206,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
         try {
             int intValue = Integer.parseInt(literalContext.getText());
             LiteralNode literalNode = new LiteralNode(intValue);
+
             literalNode.setType("int");
             return literalNode;
         } catch (NumberFormatException ignored) {}

src/main/java/semantic/Scope.java

@@ -0,0 +1,36 @@
+package semantic;
+
+import ast.type.TypeNode;
+
+import java.util.HashMap;
+import java.util.Stack;
+
+public class Scope {
+
+    private Stack<HashMap<String, TypeNode>> localVars;
+
+    public void addLocalVar(String name, TypeNode type) {
+        if (this.contains(name)) {
+            throw new RuntimeException("Variable " + name + " already exists in this scope");
+        }
+        localVars.peek().put(name, type);
+    }
+
+    public boolean contains(String name) {
+        for (HashMap<String, TypeNode> map : localVars) {
+            if (map.containsKey(name)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public void pushScope() {
+        localVars.push(new HashMap<String, TypeNode>());
+    }
+
+    public void popScope() {
+        localVars.pop();
+    }
+
+}

src/main/java/semantic/SemanticAnalyzer.java

@@ -2,22 +2,26 @@ package semantic;
 
 
 import ast.*;
-import ast.expression.ExpressionNode;
+import ast.expression.BinaryExpressionNode;
-import ast.member.ConstructorNode;
+import ast.expression.IdentifierExpressionNode;
+import ast.expression.UnaryExpressionNode;
 import ast.member.FieldNode;
 import ast.member.MemberNode;
 
 import ast.member.MethodNode;
-import ast.statement.AssignmentStatementNode;
+import ast.statement.*;
-import ast.statement.StatementNode;
+
 import java.util.ArrayList;
 import java.util.List;
+
 import typechecker.TypeCheckResult;
 
 public class SemanticAnalyzer implements SemanticVisitor {
 
     private ArrayList<String> currentFields = new ArrayList<>();
 
+    private Scope currentScope;
+
     public static ASTNode generateTast(ASTNode node) throws RuntimeException {
         SemanticAnalyzer semanticCheck = new SemanticAnalyzer();
         ProgramNode programNode = (ProgramNode) node;
@@ -30,62 +34,112 @@ public class SemanticAnalyzer implements SemanticVisitor {
     }
 
     @Override
-  public TypeCheckResult typeCheck(ProgramNode node) {
+    public TypeCheckResult analyze(ProgramNode node) {
 
         var valid = true;
 
         List<ClassNode> classes = node.classes;
         for (ClassNode classNode : classes) {
-      classNode.accept(this);
+            var result = classNode.accept(this);
+            valid = valid && result.isValid();
         }
         return new TypeCheckResult(valid, null);
     }
 
     @Override
-  public TypeCheckResult typeCheck(ClassNode classNode) {
+    public TypeCheckResult analyze(ClassNode classNode) {
+        var valid = true;
         List<MemberNode> members = classNode.members;
         for (MemberNode memberNode : members) {
             if (memberNode instanceof FieldNode fieldNode) {
-        fieldNode.accept(this);
+                var result = fieldNode.accept(this);
+                valid = valid && result.isValid();
             } else if (memberNode instanceof MethodNode methodNode) {
-        methodNode.accept(this);
+                var result = methodNode.accept(this);
+                valid = valid && result.isValid();
             }
         }
 
-    return null;
+        return new TypeCheckResult(valid, null);
+
     }
 
     @Override
-  public TypeCheckResult typeCheck(MethodNode methodNode) {
+    public TypeCheckResult analyze(MethodNode methodNode) {
+        var valid = true;
+
+        currentLocalScope.pushScope();
+
         List<StatementNode> statements = methodNode.statements;
         for (StatementNode statement : statements) {
             if (statement instanceof AssignmentStatementNode assignmentStatementNode) {
-        assignmentStatementNode.accept(this);
+                var result = assignmentStatementNode.accept(this);
+                valid = valid && result.isValid();
+            } else if (statement instanceof VariableDeclarationStatementNode variableDeclarationStatementNode) {
+                var result = variableDeclarationStatementNode.accept(this);
+                valid = valid && result.isValid();
             }
         }
-    return null;
+        return new TypeCheckResult(valid, null);
     }
 
     @Override
-  public TypeCheckResult typeCheck(FieldNode toCheck) {
+    public TypeCheckResult analyze(FieldNode toCheck) {
         if (currentFields.contains(toCheck.identifier)) {
             throw new RuntimeException(toCheck.identifier + " Is Already Declared");
         } else {
             currentFields.add(toCheck.identifier);
         }
+        return new TypeCheckResult(true, null);
+    }
+
+    @Override
+    public TypeCheckResult analyze(AssignmentStatementNode assignmentStatementNode) {
+        if (assignmentStatementNode.expression instanceof LiteralNode literalNode) {
+            TypeCheckResult varResult = assignmentStatementNode.varNode.accept(this);
+            TypeCheckResult expressionResult = assignmentStatementNode.expression.accept(this);
+        }
+        return new TypeCheckResult(true, null);
+    }
+
+    @Override
+    public TypeCheckResult analyze(VarNode toCheck) {
+        return new TypeCheckResult(true, null);
+    }
+
+    @Override
+    public TypeCheckResult analyze(BinaryExpressionNode toCheck) {
         return null;
     }
 
     @Override
-  public TypeCheckResult typeCheck(AssignmentStatementNode assignmentStatementNode) {
+    public TypeCheckResult analyze(IdentifierExpressionNode toCheck) {
-    if(assignmentStatementNode.expression instanceof LiteralNode literalNode) {
+        return null;
-      VarNode varNode = assignmentStatementNode.varNode;
-      if(varNode.getType().equals(literalNode.getType())) {
-        System.out.println("Type is same");
-      } else {
-        System.out.println("Type Mismatch");
     }
+
+    @Override
+    public TypeCheckResult analyze(UnaryExpressionNode toCheck) {
+        return null;
     }
+
+    @Override
+    public TypeCheckResult analyze(VariableDeclarationStatementNode toCheck) {
+
+        return new TypeCheckResult(true, null);
+    }
+
+    @Override
+    public TypeCheckResult analyze(IfStatementNode toCheck) {
+        return null;
+    }
+
+    @Override
+    public TypeCheckResult analyze(ReturnStatementNode toCheck) {
+        return null;
+    }
+
+    @Override
+    public TypeCheckResult analyze(WhileStatementNode toCheck) {
         return null;
     }
 

src/main/java/semantic/SemanticVisitor.java

@@ -3,60 +3,40 @@ package semantic;
 
 import ast.ClassNode;
 import ast.ProgramNode;
+import ast.VarNode;
+import ast.expression.BinaryExpressionNode;
+import ast.expression.IdentifierExpressionNode;
+import ast.expression.UnaryExpressionNode;
 import ast.member.FieldNode;
 import ast.member.MethodNode;
-import ast.statement.AssignmentStatementNode;
+import ast.statement.*;
 import typechecker.TypeCheckResult;
 
 public interface SemanticVisitor {
-//    TypeCheckResult typeCheck(ASTNode toCheck);
 
-    TypeCheckResult typeCheck(ProgramNode toCheck);
+    TypeCheckResult analyze(ProgramNode toCheck);
 
-    TypeCheckResult typeCheck(ClassNode toCheck);
+    TypeCheckResult analyze(ClassNode toCheck);
 
-    TypeCheckResult typeCheck(MethodNode toCheck);
+    TypeCheckResult analyze(MethodNode toCheck);
 
-    TypeCheckResult typeCheck(FieldNode toCheck);
+    TypeCheckResult analyze(FieldNode toCheck);
 
-    TypeCheckResult typeCheck(AssignmentStatementNode toCheck);
+    TypeCheckResult analyze(AssignmentStatementNode toCheck);
-//
-//    TypeCheckResult typeCheck(MethodParameter toCheck);
-//
-//    TypeCheckResult typeCheck(ForStmt forStmt);
-//
-//    TypeCheckResult typeCheck(WhileStmt whileStmt);
-//
-//    TypeCheckResult typeCheck(ReturnStmt returnStmt);
-//
-//    TypeCheckResult typeCheck(LocalVarDecl localVarDecl);
-//
-//    TypeCheckResult typeCheck(IfStmt ifStmt);
-//
-//    TypeCheckResult typeCheck(Block block);
-//
-//    TypeCheckResult typeCheck(NewDecl newDecl);
-//
-//    TypeCheckResult typeCheck(MethodCall methodCall);
-//
-//    TypeCheckResult typeCheck(Unary unary);
-//
-//    TypeCheckResult typeCheck(This aThis);
-//
-//    TypeCheckResult typeCheck(Null aNull);
-//
-//    TypeCheckResult typeCheck(LocalOrFieldVar localOrFieldVar);
-//
-//    TypeCheckResult typeCheck(IntegerExpr integerExpr);
-//
-//    TypeCheckResult typeCheck(InstVar instVar);
-//
-//    TypeCheckResult typeCheck(CharExpr charExpr);
-//
-//    TypeCheckResult typeCheck(BoolExpr boolExpr);
-//
-//    TypeCheckResult typeCheck(Binary binary);
-//
-//    TypeCheckResult typeCheck(StringExpr instVar);
 
+    TypeCheckResult analyze(VarNode toCheck);
+
+    TypeCheckResult analyze(BinaryExpressionNode toCheck);
+
+    TypeCheckResult analyze(IdentifierExpressionNode toCheck);
+
+    TypeCheckResult analyze(UnaryExpressionNode toCheck);
+
+    TypeCheckResult analyze(VariableDeclarationStatementNode toCheck);
+
+    TypeCheckResult analyze(IfStatementNode toCheck);
+
+    TypeCheckResult analyze(ReturnStatementNode toCheck);
+
+    TypeCheckResult analyze(WhileStatementNode toCheck);
 }

src/main/java/typechecker/Type.java

@@ -1,5 +0,0 @@
-package typechecker;
-
-public interface Type {
-    boolean equals(Object obj);
-}

src/main/java/typechecker/TypeCheckResult.java

@@ -1,12 +1,14 @@
 package typechecker;
 
 
+import ast.type.TypeNode;
+
 public class TypeCheckResult {
 
   private boolean valid;
-  private Type type;
+  private TypeNode type;
 
-  public TypeCheckResult(boolean valid, Type type) {
+  public TypeCheckResult(boolean valid, TypeNode type) {
     this.valid = valid;
     this.type = type;
   }
@@ -15,7 +17,7 @@ public class TypeCheckResult {
     return valid;
   }
 
-  public Type getType() {
+  public TypeNode getType() {
     return type;
   }
 }

src/main/java/typechecker/Typer.java

@@ -1,9 +0,0 @@
-package typechecker;
-
-public class Typer {
-
-    public static void Typeify(){
-
-    }
-
-}

src/main/java/typechecker/Visitable.java

@@ -1,16 +0,0 @@
-package typechecker;
-
-import semantic.SemanticVisitor;
-
-public interface Visitable {
-//    default void accept(ProgramCodeVisitor visitor) {
-//    }
-//
-//    default void accept(ClassCodeVisitor visitor) {
-//    }
-//
-//    default void accept(MethodCodeVisitor visitor) {
-//    }
-
-    TypeCheckResult accept(SemanticVisitor visitor);
-}

src/main/java/visitor/Visitable.java

@@ -0,0 +1,21 @@
+package visitor;
+
+import bytecode.visitor.ClassVisitor;
+import bytecode.visitor.MethodVisitor;
+import bytecode.visitor.ProgramVisitor;
+import semantic.SemanticVisitor;
+import typechecker.TypeCheckResult;
+
+public interface Visitable {
+    default void accept(ProgramVisitor programVisitor) {
+
+    }
+    default void accept(ClassVisitor classVisitor) {
+
+    }
+    default void accept(MethodVisitor methodVisitor) {
+
+    }
+
+    TypeCheckResult accept(SemanticVisitor visitor);
+}