651827 - TI: "Assertion failure: v_.s.tag != JSVAL_TAG_CLEAR,"

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

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

Attachment: stack

try {
    function x() {}
} catch(e) {}
switch (undefined) {
    case(y) = Infinity:
}

asserts js debug shell on JM changeset 1fe03044bfeb with -m, -a and -n at Assertion failure: v_.s.tag != JSVAL_TAG_CLEAR,

autoBisect shows this is probably related to the following changeset:

The first bad revision is:
changeset:   68213:244446b156b7
user:        Brian Hackett
date:        Sat Apr 16 06:54:01 2011 -0700
summary:     [INFER] LICM and bounds check hoisting for x.length, bug 649693.

Comment 1

[Brian Hackett [Laid off!]]

Simple bogus assertion, we were asserting the consistency of a different value from the one which we were about to access (needed to assert on a FrameEntry's backing's data rather than the FrameEntry itself).

http://hg.mozilla.org/projects/jaegermonkey/rev/96b40c951d15

Comment 2

[Christian Holler (:decoder)]

Automatically extracted testcase for this bug was committed:

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