remove unused labels and make break work

src/main/java/de/maishai/typedast/MethodContext.java

@@ -15,23 +15,20 @@ public class MethodContext {
     public record LocalVariable(String name, int index, Type type) {
     }
 
-    private Label startLabel;
-    private Label endLabel;
     private MethodVisitor mv;
-    private ClassContext classContext;
+    private final ClassContext classContext;
     private int localVarIndex = 0;
     private final Map<String, LocalVariable> variableIndex = new HashMap<>();
     private Stack<Integer> stack = new Stack<>();
     private int maxStack = 0;
+    //used to jump out of loops with break
+    private final Stack<Label> breakLabels = new Stack<>();
 
     public MethodContext(ClassContext classContext, MethodVisitor mv) {
-        startLabel = new Label();
-        endLabel = new Label();
         this.mv = mv;
         this.classContext = classContext;
         registerVariable("this", classContext.getType());
         mv.visitCode();
-        mv.visitLabel(startLabel);
     }
 
     public void registerVariable(String name, Type type) {
@@ -79,7 +76,6 @@ public class MethodContext {
     }
 
     public void wrapUp() {
-        mv.visitLabel(endLabel);
         System.out.println("maxStack: " + maxStack + " localVarIndex: " + localVarIndex);
         mv.visitMaxs(maxStack, localVarIndex);
         mv.visitEnd();

src/main/java/de/maishai/typedast/typedclass/TypedBreak.java

@@ -5,6 +5,7 @@ import de.maishai.typedast.MethodContext;
 import de.maishai.typedast.TypedStatement;
 import de.maishai.typedast.Type;
 import lombok.Data;
+import org.objectweb.asm.Opcodes;
 
 @Data
 public class TypedBreak implements TypedStatement {
@@ -17,6 +18,9 @@ public class TypedBreak implements TypedStatement {
 
     @Override
     public void codeGen(MethodContext ctx) {
-
+        if (ctx.getBreakLabels().isEmpty()) {
+            throw new RuntimeException("Break statement outside of loop");
+        }
+        ctx.getMv().visitJumpInsn(Opcodes.GOTO, ctx.getBreakLabels().pop());
     }
 }

src/main/java/de/maishai/typedast/typedclass/TypedDoWhile.java

@@ -37,6 +37,7 @@ public class TypedDoWhile implements TypedStatement {
     public void codeGen(MethodContext ctx) {
         Label loopStart = new Label();
         Label loopEnd = new Label();
+        ctx.getBreakLabels().push(loopEnd);
 
         ctx.getMv().visitLabel(loopStart);
 

src/main/java/de/maishai/typedast/typedclass/TypedFor.java

@@ -47,6 +47,7 @@ public class TypedFor implements TypedStatement {
         Label loopStart = new Label();
         Label loopUpdate = new Label();
         Label loopEnd = new Label();
+        ctx.getBreakLabels().push(loopEnd);
 
         assign.codeGen(ctx);
         ctx.getMv().visitLabel(loopStart);

src/main/java/de/maishai/typedast/typedclass/TypedWhile.java

@@ -38,6 +38,7 @@ public class TypedWhile implements TypedStatement {
     public void codeGen(MethodContext ctx) {
         Label loopStart = new Label();
         Label loopEnd = new Label();
+        ctx.getBreakLabels().push(loopEnd);
 
         ctx.getMv().visitLabel(loopStart);
         cond.codeGen(ctx);

src/main/resources/JavaTestfiles/ClassCanBeBytecoded.java

@@ -4,14 +4,16 @@ public class ClassCanBeBytecoded {
     public ClassCanBeBytecoded() {
     }
 
-    public int callable() {
-        return 1;
-    }
 
     public int test(int var1) {
         int i;
-        for (i = 0; i < 12; i = i + 1) {
+        i = 0;
+        while (i < 10) {
+            i = i + 1;
             var1 = var1 + 1;
+            if (var1 == 5) {
+                break;
+            }
         }
         return var1;
     }