676857 - Make it a compile-time error to have a script-implementable interface with more methods than xptcall stubs can handle

Status: RESOLVED FIXED

(Core :: XPCOM, defect)

Description

[Boris Zbarsky [:bzbarsky]]

xptcall is capped at something like 249 methods.  I ran into that today with some DOM interfaces and orange builds.... but that code should just have not compiled instead of dying on pure virtual calls, imo.

Comment 1

[Joshua Cranmer [:jcranmer]]

I have a patch which:
1. Causes an error with xpidl
2. Prevents the interface from being loaded with xpt

(un)Fortunately, nsIDOMCSS2Properties has 469 methods on my machine, so it's a good check to make sure that we actually fail hard in these cases.

Comment 2

[Joshua Cranmer [:jcranmer]]

Attachment: First cut

This is a first cut at the bug. bz suggested over IRC that I elide the check in case of builtinclass interfaces. Since the real problem is over whether or not in can be stubbed, I'm also going to track down the stub generation code and make that fail.

Comment 3

[Joshua Cranmer [:jcranmer]]

http://dxr.mozilla.org/mozilla/mozilla-central/xpcom/reflect/xptcall/src/xptcall.cpp.html#l69

Builtinclasses already fail the stub generation, so there shouldn't be a problem to failing to load that xpt file.

Comment 4

[Joshua Cranmer [:jcranmer]]

Attachment: Patch, version 1

This omits the error in case of builtinclass.

Comment 5

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

(In reply to Boris Zbarsky (:bz) from comment #0)
> xptcall is capped at something like 249 methods.  I ran into that today with
> some DOM interfaces and orange builds.... but that code should just have not
> compiled instead of dying on pure virtual calls, imo.

When you say 'xptcall' is capped, you mean the stubs, and not NS_InvokeByIndex, right?

Comment 6

[Boris Zbarsky [:bzbarsky]]

I mean the stubs, yes.

Comment 7

[Justin Wood (:Callek)]

Just a few days, and I can't import this to m-i atm, clearing checkin-needed until patch is updated.

Comment 8

[Joshua Cranmer [:jcranmer]]

I refreshed the patch and pushed to mozilla-inbound...

Comment 9

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

http://hg.mozilla.org/mozilla-central/rev/16107d140423