Dart2Js Mirrors throws exception when unrelated library is imported #19173

kevmoo · 2014-06-03T19:53:21Z

The case:

Package A:
define library X
define library Y, exports X

Package B:
define library Z, exports A.Y

Package C:
Import library B.Z
Try the following:

import 'dart:mirrors';
import 'package:B/Z.dart';

void main() {
ClassMirror typeMirror = reflectType(Bar);
var decs = typeMirror.declarations;
}

class Bar {
int a;
}

Results in a crash, but only in Dart2JS + Checked Mode

kevmoo · 2014-06-03T20:32:18Z

I have a test that reproduces this issue, but it's far from minimal

It does not seem relate to exports as I originally guessed

Changed the title to: "Dart2Js Mirrors throws exception when unrelated library is imported".

ghost · 2014-06-04T15:31:39Z

Here is an even smaller example:

import 'dart:mirrors';

class A {
const A();
}

@deprecated
const A anA = const A();

main() {
  ClassMirror typeMirror = reflectType(A);
  var decs = typeMirror.declarations;
  print(decs.length);
}

The issue is that the mirrors implementation cannot handle metadata in library descriptors. Unfortunately, I have no time left to fix this right now.

dgrove · 2014-06-06T02:23:29Z

Added C1 label.

ghost · 2014-06-10T17:52:37Z

Set owner to @herhut-ggl.
Added Started label.

ghost · 2014-06-12T11:11:51Z

Fixed as of revision r37256.

Added Fixed label.

kevmoo added Type-Defect library-mirrors web-dart2js labels Jun 12, 2014

kevmoo assigned ghost Jun 12, 2014

kevmoo removed the priority-unassigned label Mar 1, 2016

This issue was closed.

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