Re: [Pyobjc-dev] Inject?

[Bob I. <bo...@re...>]

I think that the i386 mach_inject has hit svn already.. Check the =20
extendamac archives.

As for variable vs. fixed length instructions.. I think there's a =20
preamble on every i386 function anyway that can be (ab)used to =20
replace functions. PyObjC doesn't need that functionality though, it =20
only needs to load new code, not override anything.

-bob

On May 9, 2006, at 8:49 AM, Saggau wrote:

> Do not envy the folks working on mach_inject for Intel, for they =20
> shuttle strange rocks up steep hills.  The PPC mach_inject, =20
> originally written by a really fabulous cat called Jonathan "Wolf" =20
> Rentzsch, can assume (thanks to the RISC instruction set of the =20
> PPC) that instructions are of fixed-length.  Our new macintels have =20=

> the advantage/disadvantage that comes with instructions of variable =20=

> length (wikipedia: RISC CISC).  The genius of mach_inject just got =20
> a whole lot harder to implement because running that first injected =20=

> bit of code now requires some mechanism for knowing how long it is =20
> other than "it's this.  always."  The good news is that "Wolf" and =20
> co. appear to be approaching a solution!  It also looks like the =20
> "Wolf" part of that equation is going to find some time to chew on =20
> this problem soon.  He's rather in demand these days...
>
> We wait, but we probably won't wait long.  :)
>
> Cheers,
> Jonathan
>
> PS -
> "
> Right now we'll stay the course with instruction overwriting, but be
> aware we have instruction insertion in our back pocket if x86
>
> hack-arounds sufficiently pisses us off.
> " - Jonathan "Wolf" Rentzsch on http://sourceforge.net/mailarchive/=20
> forum.php?thread_id=3D10018617&forum_id=3D1295
> On 5/9/06, Ronald Oussoren <ron...@ma...> wrote:
>
> On 9-mei-2006, at 12:18, ytrewq1 wrote:
>
> > Thanks to the help I received here, I've gotten most of my plug-ins
> > working as Universal binaries.  One of the remaining ones is =20
> basically
> > a wrapper around a couple of the Inject examples.  I get the =20
> following
> > error when I try to run the examples:
> >
> > NotImplementedError: objc.inject is only supported on Mac OS X 10.3
> > and later
>
> That message isn't entirely true anymore, objc.inject also isn't
> supported on x86 systems. I disabled it when I did the initial port
> and haven't looked at it afterwards because I don't use the
> functionality myself.
>
> IIRC mach_inject doesn't work on darwin/x86 unless you have special
> privileges (aka "you're root"). Independent of this someone would
> have to write the assembly
> code that is used as the stub that is injected into the host
> application. I've seen enough assembly code while porting libffi, and
> my assembly skill isn't good enough to actually do the work anyway.
>
> However, it seems a port of mach_inject (which objc.inject wraps) to
> intel is in progress (see the extendamac archives at http://
> sourceforge.net/mailarchive/forum.php?forum_id=3D1295), maybe we can
> use that whenever it is finished.
>
>
> >
> > I take it this is related to what is mentioned about mach_inject at:
> >
> > http://bob.pythonmac.org/archives/2005/06/06/python-on-mac-os-x-x86/
>
> Not really.
> >
> > Is there any hope of getting this to work?  I've found the inject
> > interpreter
> > functionality to be a great help in developing plug-ins as the
> > number of
> > times I restart the host application has been reduced tremendously
> > and the
> > interactive development style enabled is a big plus.
> >
> > Is the following relevant to this issue?
> >
> > http://guiheneuf.org/Site/mach%20inject%20for%20intel.html
>
> I cannot comment on this page because I cannot open this URL (server
> stops responding).
>
> Ronald
>
> >
> >
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42
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>
>
>
>
>
>
> --=20
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> tradition is a good measure of his vitality.  - Harry Partch
>
> There is a computer disease that anybody who works with computers =20
> knows about. It's a very serious disease and it interferes =20
> completely with the work. The trouble with computers is that you =20
> 'play' with them! - Richard P. Feynman
>
> Few people are capable of expressing with equanimity opinions which =20=

> differ from the prejudices of their social environment.  Most =20
> people are not even capable of forming such opinions.  - Einstein
>