private static Field getReflectionSlotField(Class<?> reflectionClass) {
   try {
     Field field = reflectionClass.getDeclaredField("slot");
     field.setAccessible(true);
     return field;
   } catch (NoSuchFieldException | SecurityException e) {
     throw new GraalInternalError(e);
   }
 }
 public ResolvedJavaMethod lookupJavaConstructor(Constructor<?> reflectionConstructor) {
   try {
     Class<?> holder = reflectionConstructor.getDeclaringClass();
     final int slot = reflectionConstructorSlot.getInt(reflectionConstructor);
     final long metaspaceMethod = runtime.getCompilerToVM().getMetaspaceMethod(holder, slot);
     return HotSpotResolvedJavaMethod.fromMetaspace(metaspaceMethod);
   } catch (IllegalArgumentException | IllegalAccessException e) {
     throw new GraalInternalError(e);
   }
 }
  public ResolvedJavaField lookupJavaField(Field reflectionField) {
    String name = reflectionField.getName();
    Class<?> fieldHolder = reflectionField.getDeclaringClass();
    Class<?> fieldType = reflectionField.getType();
    // java.lang.reflect.Field's modifiers should be enough here since VM internal modifier bits
    // are not used (yet).
    final int modifiers = reflectionField.getModifiers();
    final long offset =
        Modifier.isStatic(modifiers)
            ? unsafe.staticFieldOffset(reflectionField)
            : unsafe.objectFieldOffset(reflectionField);

    ResolvedJavaType holder = HotSpotResolvedObjectType.fromClass(fieldHolder);
    ResolvedJavaType type = HotSpotResolvedObjectType.fromClass(fieldType);

    if (offset != -1) {
      HotSpotResolvedObjectType resolved = (HotSpotResolvedObjectType) holder;
      return resolved.createField(name, type, offset, modifiers);
    } else {
      throw GraalInternalError.shouldNotReachHere("unresolved field " + reflectionField);
    }
  }