732851 - IonMonkey: Assertion failure: (objBits >> 47) == 0, at ../../jsval.h:782

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[Christian Holler (:decoder)]

The following testcase asserts on ionmonkey revision 1fd6c40d3852 (run with --ion -n -m --ion-eager):


var OMIT = {};
var WRITABLES = [true, false, OMIT];
{
  var desc = {};
  function put(field, value)
    desc[field] = value;
  WRITABLES.forEach(function(writable) {
    put("writable", writable)
  });
};

Comment 1

[David Anderson [:dvander] - inactive, e-mail if emergency]

This is a bogus assert that is unfortunately really painful to work around. I added to the paper-over logic. I have plans to address this but it's best to wait for the scope work to finish.

http://hg.mozilla.org/projects/ionmonkey/rev/6c52f57ea5ee

Comment 2

[Christian Holler (:decoder)]

A testcase for this bug was automatically identified at js/src/jit-test/tests/ion/bug732851.js.