[llvm-dev] Function - replaceAllUsesWith

[Gaier, Bjoern via llvm-dev]

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.
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