llvm dev - Jan 2018 - Integrating llvm pass with pass manager

Clang doesn’t support adding passes from the command line the way opt does.
Opt has special parsing in opt.cpp for this that clang doesn’t have.

I’m not sure what the correct way to do this is. I think your plugin needs
to do something to tell clang/llvm when to run the pass. I’ll try to look
later when I’m back at a computer.

On Fri, Jan 12, 2018 at 7:00 PM 陳韋任 via llvm-dev <llvm-dev at
lists.llvm.org>
wrote:
> Do you pull clang under llvm/tools and compile it as well? In theory, if
> `opt` recognize the option, so does `clang -mllvm`.
>
>
> 2018-01-12 8:47 GMT+08:00 sangeeta chowdhary <sangitachowdhary at
gmail.com>:
>
>> Hello,
>>
>> I have tried giving this option like this
>>
>> clang -c -emit-llvm -mllvm -rdetector hello.c -c -o hello.bc
>> but I am getting error " Unknown command line argument
'-rdetector’.”
>>
>> Although same option work with opt -
>> opt -rdetector hello.ll
>>
>>
>>
>> On Jan 11, 2018, at 6:41 PM, sangeeta chowdhary <
>> sangitachowdhary at gmail.com> wrote:
>>
>> Can you please tell me when I need to give this option and how. I am
>> sorry I am new to this. Thank you so much for responding.
>>
>> On Jan 11, 2018, at 6:28 PM, 陳韋任 <chenwj.cs97g at g2.nctu.edu.tw>
wrote:
>>
>> -mllvm
>>
>>
>>
>>
> --
> Wei-Ren Chen (陳韋任)
> Homepage: https://people.cs.nctu.edu.tw/~chenwj
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
-- 
~Craig
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On 13 Jan 2018, at 03:45, Craig Topper via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> I’m not sure what the correct way to do this is. I think your plugin needs
to do something to tell clang/llvm when to run the pass. I’ll try to look later
when I’m back at a computer.
You need to use RegisterStandardPasses to add it to the default pipeline
automatically.  You can find an example here:

https://github.com/CompilerTeaching/SimplePass/blob/ba5248a9ea0bd9e1fab3b1f8a5c85d6e0db57acd/SimplePass.cc#L116

David

I have taken SimplePass and added in Transform directory, “libLLVMSimplePass.a”
is built but I can not see this pass in opt —help. I don’t even see the name of
pass while registering it in the example.
> On Jan 13, 2018, at 7:35 AM, David Chisnall <David.Chisnall at
cl.cam.ac.uk> wrote:
> 
> On 13 Jan 2018, at 03:45, Craig Topper via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>> 
>> I’m not sure what the correct way to do this is. I think your plugin
needs to do something to tell clang/llvm when to run the pass. I’ll try to look
later when I’m back at a computer.
> 
> You need to use RegisterStandardPasses to add it to the default pipeline
automatically.  You can find an example here:
> 
>
https://github.com/CompilerTeaching/SimplePass/blob/ba5248a9ea0bd9e1fab3b1f8a5c85d6e0db57acd/SimplePass.cc#L116
> 
> David
> 
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