Fix #312

resources/bytecode/javFiles/Bug312.jav

@@ -0,0 +1,8 @@
+public class Bug312 {
+    Bug312A i = new Bug312A();
+    public main() {
+        if (i == null) {}
+    }
+}
+
+class Bug312A {}

src/main/java/de/dhbwstuttgart/bytecode/Codegen.java

@@ -281,9 +281,12 @@ public class Codegen {
             return TargetType.Float;
         } else if (left.equals(TargetType.Long) || right.equals(TargetType.Long)) {
             return TargetType.Long;
-        } else {
+        } else if (left.equals(TargetType.Integer) || right.equals(TargetType.Integer)) {
             return TargetType.Integer;
+        } else if (left.equals(TargetType.Short) || right.equals(TargetType.Short)) {
+            return TargetType.Short;
         }
+        return left;
     }
 
     private void generateBinaryOp(State state, TargetBinaryOp op) {

src/test/java/TestComplete.java

@@ -1039,4 +1039,12 @@ public class TestComplete {
         var instance = clazz.getDeclaredConstructor().newInstance();
         assertEquals(clazz.getDeclaredMethod("toString").invoke(instance), "3");
     }
+
+    @Test
+    public void testBug312() throws Exception {
+        var classFiles = generateClassFiles(new ByteArrayClassLoader(), "Bug312.jav");
+        var clazz = classFiles.get("Bug312");
+        var instance = clazz.getDeclaredConstructor().newInstance();
+        clazz.getDeclaredMethod("main").invoke(instance);
+    }
 }