641231 - TI: Crash [@ js::types::TypeFailure]

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

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

Function("function a(){this(*)}new a")()

crashes js debug shells on JM changeset bcf148dbce2f with -m, -a and -n at:

[infer failure] Missing type at #3:00000 pushed 0: Function:prototype:new:prototype:new
Segmentation fault

Comment 1

[Brian Hackett [Laid off!]]

Nice, bugs here from both the scripted 'new' changes in bug 619433 and from bug 621942.  Normally we want to ensure that function objects with the same getFunctionPrivate have the same type (modulo mutable __proto__, oi).  This doesn't hold for non-compileAndGo code, and we needed to account for that when computing the possible 'new' objects of a script.  The second bug is that the call IC code did not always mark scripts which have been called with 'new'.

http://hg.mozilla.org/projects/jaegermonkey/rev/1ce8efbb75cc

Comment 2

[Christian Holler (:decoder)]

A testcase for this bug was automatically identified at js/src/jit-test/tests/basic/bug641231.js.