899402 - runtime error: member call on null pointer of type 'js::ion::IonJSFrameLayout'

Status: RESOLVED DUPLICATE of bug 1165904

(Core :: JavaScript Engine, defect)

Description

[Yeuk Hon Wong]

Attachment: stack_ionframe.txt

This is the bug following https://bugzilla.mozilla.org/show_bug.cgi?id=899399.

The full stack trace can be seen from that bug ticket, but I am attaching the subset (the relevant) here.

Comment 1

[Jesse Ruderman]

../ion/shared/IonFrames-x86-shared.h:72:42: runtime error: member call on null pointer of type 'js::ion::IonJSFrameLayout'

Comment 2

[Jesse Ruderman]

This code so obviously wrong I'm surprised none of our compilers optimize the entire function into __builtin_unreachable.

Introduced:    http://hg.mozilla.org/mozilla-central/rev/b02a7b214e49#l12.12
Spread:        http://hg.mozilla.org/mozilla-central/rev/fd94cdea9dad

Comment 3

[Nicolas B. Pierron [:nbp]]

(In reply to Jesse Ruderman from comment #2)
> This code so obviously wrong I'm surprised none of our compilers optimize
> the entire function into __builtin_unreachable.

Because this is a well supported undefined behavior.
and so this is not critical at all unless somebody want to change the value of the constant NULL.