[LLVMdev] Fwd: Improper Function::iterator increment

[David Blaikie]

On Sun, Feb 8, 2015 at 11:23 AM, Pranav Kant <pranav913 at gmail.com> wrote:

> So, you mean to say that the above implementation is correct and should
> work fine.
>

So far as I can see - but I could be missing something.


> I initially thought that the above way is not the correct way anymore
> since 3.5.0 might have changed few things.
>
> Anyways here is my dirty code I have written for my research project that
> I took the above snippet from :
>
> https://github.com/pranavk/spatial-computing/blob/master/waves.cpp#L105
>

Someone (not necessarily me) will presumably need the
input/command/arguments/whatever required to trigger the infinite loop in
this code that you're seeing, as well as the code there.


>
>
>
> On Sun, Feb 8, 2015 at 10:25 PM, David Blaikie <dblaikie at gmail.com> wrote:
>
>> This may be difficult yo reproduce or debug without a more complete
>> (though preferably minimal) test case.
>> On Feb 8, 2015 8:31 AM, "Pranav Kant" <pranav913 at gmail.com> wrote:
>>
>>> void Wave::init (const Function &F){
>>>     Function::const_iterator ie = F.end();
>>>     outs() << ie << "\n\n";
>>>     for (Function::const_iterator I = F.begin(), IE = F.end(); I != IE;
>>> I++, K++){
>>>        outs() << I << "\n";
>>>        // some manipulation with I
>>>     }
>>> }
>>>
>>> I used the above shown function in my pass in LLVM 3.4.2 and it used to
>>> work fine but when I am compiling this pass with 3.5.0, this is a never
>>> ending loop. Can someone please suggest me what can be wrong here ?
>>>
>>> Upon some debugging, I found out that const_iterator I never becomes
>>> equal to IE, rather it goes past IE when incremented and hence loop never
>>> ends.
>>>
>>> Following is the output upon executing above code.
>>>
>>> 0x2e08248 <- address of ie
>>> 0x2e16630 <- address of I initially
>>> 0x2e08250 <- incremented I
>>> 0x2e165e0
>>> 0x2e16630
>>> 0x2e08250
>>> 0x2e165e0
>>> 0x2e16630
>>> 0x2e08250
>>>
>>>
>>>
>>> --
>>> Regards,
>>> Pranav Kant,
>>> Department of Computer Science
>>> National Institute of Technology Hamirpur
>>> http://pricked.in/
>>>
>>>
>>>
>>> --
>>> Regards,
>>> Pranav Kant,
>>> Department of Computer Science
>>> National Institute of Technology Hamirpur
>>> http://pricked.in/
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>
>
>
> --
> Regards,
> Pranav Kant,
> Department of Computer Science
> National Institute of Technology Hamirpur
> http://pricked.in/
>
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