llvm dev - Jan 2019 - Function - replaceAllUsesWith

I could actually track down the cause of the problem:

mainModue->getFunction("puts")->replaceAllUsesWith(
llvm::ConstantExpr::getPointerCast(
llvm::ConstantInt::get(llvm::IntegerType::get(context, 64), 0xF),
mainModue->getFunction("puts")->getType()
)
);
The problem is the line where I receive the type of the function
"puts", it will crash the application - when used as the parameter for
"getPointerCast". I generated a new type, then the function didn't
crashed anymore.
Is there a way to copy the value? I want to ensure to use the correct type...

Kind greetings
Björn

-----Original Message-----
From: Tim Northover <t.p.northover at gmail.com>
Sent: Dienstag, 15. Januar 2019 13:42
To: Gaier, Bjoern <Bjoern.Gaier at horiba.com>
Cc: Stefan Gränitz <stefan.graenitz at gmail.com>; Mehdi AMINI
<joker.eph at gmail.com>; llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Function - replaceAllUsesWith

On Tue, 15 Jan 2019 at 12:35, Gaier, Bjoern <Bjoern.Gaier at horiba.com>
wrote:
> Sadly I have currently only a release build of LLVM7 with no assertions
turned on...
That's definitely the first thing you should fix. Preferably a debug build
too. The only reason you should ever be debugging against a release build of
LLVM is if you have a Heisenbug that doesn't happen otherwise. It's a
horrible experience.
> So I just know that the line of code I posted is crashing.
> No output, no anything....just...Crash...
Even a release build can give you a backtrace if you attach a debugger, though
as I've said I wouldn't normally bother.

Cheers.

Tim.
Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr.
DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus
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On Tue, 15 Jan 2019 at 14:04, Gaier, Bjoern <Bjoern.Gaier at horiba.com>
wrote:
> Is there a way to copy the value? I want to ensure to use the correct
type...
I don't think copying is the issue, you're just passing pointers
within a single Context around by the looks of it.

I have just noticed the getPointerCast actually only does ptrtoint but
you want inttoptr, without assertions it's possible that's doing bad
things in a non-obvious way. It should certainly be getIntToPtr
anyway.

Cheers.

Tim.

What does that mean for my code and the idea?
I'm a really unexperienced LLVM user...

-----Original Message-----
From: Tim Northover <t.p.northover at gmail.com>
Sent: Dienstag, 15. Januar 2019 15:19
To: Gaier, Bjoern <Bjoern.Gaier at horiba.com>
Cc: Stefan Gränitz <stefan.graenitz at gmail.com>; Mehdi AMINI
<joker.eph at gmail.com>; llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Function - replaceAllUsesWith

On Tue, 15 Jan 2019 at 14:04, Gaier, Bjoern <Bjoern.Gaier at horiba.com>
wrote:
> Is there a way to copy the value? I want to ensure to use the correct
type...
I don't think copying is the issue, you're just passing pointers within
a single Context around by the looks of it.

I have just noticed the getPointerCast actually only does ptrtoint but you want
inttoptr, without assertions it's possible that's doing bad things in a
non-obvious way. It should certainly be getIntToPtr anyway.

Cheers.

Tim.
Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr.
DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus
Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika