698074 - "Assertion failure: hasSlot() && !hasMissingSlot(),"

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Attachment: stack

a = (0).__proto__
b = (0).__proto__
b.__defineSetter__("valueOf", function() {})
a + 8

asserts js debug shell on JM changeset b01eb1ba58ce without any CLI flags at Assertion failure: hasSlot() && !hasMissingSlot(),

autoBisect shows this is probably related to the following changeset:

The first bad revision is:
changeset:   77570:ff51ddfdf5d1
user:        Brian Hackett
date:        Wed Sep 28 15:04:55 2011 -0700
summary:     Remove shape numbers and Shape::slotSpan, factor Shape getter/setter into BaseShape, bug 684505.

Comment 1

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Related to bug 690396 ? (The testcase there involves yield, which this testcase doesn't.)

Comment 2

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

As per decoder's request, this does not reproduce on m-c changeset 1c7e1db3645b.

Comment 3

[Brian Hackett [Laid off!]]

This is a new assertion added under a function called in many places (shape->slot()) so can indicate separate problems.  This is a different misuse of shape->slot() than the one in bug 690396.

https://hg.mozilla.org/projects/jaegermonkey/rev/c46c6ebe3d19

Comment 4

[Christian Holler (:decoder)]

Automatically extracted testcase for this bug was committed:

https://hg.mozilla.org/mozilla-central/rev/efaf8960a929