[llvm-dev] clib `open` writes a linefeed to stdout when used in the JIT

edA-qa mort-ora-y via llvm-dev llvm-dev at lists.llvm.org
Sun Jul 3 03:45:56 PDT 2016

It was my mistake. A leftover debug printing end empty line near the IR
generation code that happens to only be invoked on a function like `open`.

On 03/07/16 12:43, edA-qa mort-ora-y via llvm-dev wrote:
> Okay, at least it's not the execution but building causing the problem.
> I'm trying to locate the precise point (maybe I have an errant print
> statement).
> On 03/07/16 12:34, edA-qa mort-ora-y via llvm-dev wrote:
>> I'm having a problem with my code generating empty lines and it appears
>> to be the CLib `open` function generating an empty line when used within
>> the JIT-VM.  If I compile my program to an exe file it doesn't happen. I
>> also have a lot of other code running in the VM without this problem,
>> it's somehow particular to `open`.
>> A chunk of my IR that calls `open`:
>> defer_body_26:                                    ; preds = %defer_end_11
>>   %59 = load i8*, i8** %f8686688__enc_n
>>   %60 = getelementptr inbounds i8, i8* %59, i64 16
>>   %61 = call i32 @open(i8* %60, i32 577, i32 511)
>>   store i32 %61, i32* %f8686688__f
>>   br label %defer_block_25
>> Where elsewhere I have `declare i32 @open(i8*, i32, i32)`.
>> Any ideas on what could possible be causing this?
>> I'm using LLVM3.8 with GCC 5.3.1 on Ubuntu 16.04.

edA-qa mort-ora-y 

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