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

@@ -23,9 +23,4 @@ public class AssignableNode implements IStatementExpressionNode {
         return visitor.analyze(this);
     }
 
-    @Override
-    public void accept(MethodVisitor methodVisitor) {
-        methodVisitor.visit(this);
-    }
-
 }

src/main/java/bytecode/MethodCodeGen.java

@@ -72,7 +72,6 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
             statementNode.accept(this);
         }
 
-        methodVisitor.visitInsn(RETURN);
         methodVisitor.visitMaxs(0, 0);
         methodVisitor.visitEnd();
     }
@@ -386,17 +385,61 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
     @Override
     public void visit(WhileNode whileNode) {
+        Label loopLabel = new Label();
+        Label endOfLoopLabel = new Label();
 
+        methodVisitor.visitLabel(loopLabel);
+        // while loop
+        whileNode.expression.accept(this);
+        methodVisitor.visitJumpInsn(IFEQ, endOfLoopLabel); // if condition is false, jump out of loop
+
+        whileNode.block.accept(this);
+        methodVisitor.visitJumpInsn(GOTO, loopLabel);
+
+        methodVisitor.visitLabel(endOfLoopLabel);
     }
 
     @Override
     public void visit(DecrementNode decrementNode) {
+        switch (decrementNode.crementType) {
+            case PREFIX: // --i
+                if(decrementNode.assignableExpression.memberAccess == null) { // local Var
+                    methodVisitor.visitIincInsn(localVaribales.indexOf(decrementNode.assignableExpression.identifier), -1);
+                } else { // Field or var from other object
 
                 }
+                break;
+            case SUFFIX: // i--
+                if(decrementNode.assignableExpression.memberAccess == null) { // local Var
+                    methodVisitor.visitIincInsn(localVaribales.indexOf(decrementNode.assignableExpression.identifier), -1);
+                } else { // Field or var from other object
+
+                }
+                break;
+        }
+    }
 
     @Override
     public void visit(IncrementNode incrementNode) {
+        switch (incrementNode.crementType) {
+            case PREFIX: // ++i
+                if(incrementNode.assignableExpression.memberAccess == null) { // local Var
+                    methodVisitor.visitIincInsn(localVaribales.indexOf(incrementNode.assignableExpression.identifier), 1);
+                    methodVisitor.visitVarInsn(ISTORE, localVaribales.indexOf(incrementNode.assignableExpression.identifier));
 
+                } else { // Field or var from other object
+
+                }
+                break;
+            case SUFFIX: // i++
+                if(incrementNode.assignableExpression.memberAccess == null) { // local Var
+                    methodVisitor.visitVarInsn(ISTORE, localVaribales.indexOf(incrementNode.assignableExpression.identifier));
+                    methodVisitor.visitIincInsn(localVaribales.indexOf(incrementNode.assignableExpression.identifier), 1);
+                } else { // Field or var from other object
+
+                }
+                break;
+        }
     }
 
     @Override
@@ -413,9 +456,4 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
     public void visit(TargetNode targetNode) {
 
     }
-
-    @Override
-    public void visit(AssignableNode assignableNode) {
-
-    }
 }

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

@@ -53,7 +53,6 @@ public interface MethodVisitor {
     void visit(MethodCallNode methodCallNode);
     void visit(TargetNode targetNode);
 
-    void visit(AssignableNode assignableNode);
     void visit(AssignNode assignNode);
     void visit(NewDeclarationNode newDeclarationNode);