[LLVMdev] Passing command line arguments to optimization passes

[Jim Grosbach]

Yep. The ARM, X86 and PPC backends do this, for example. To find some examples, in <llvm>/lib/Target, run: grep -R "extern cl::opt" *

-Jim

On Jan 27, 2011, at 11:50 PM, Arnaud Allard de Grandmaison wrote:

> You could make the cl:opt object visible outside one of your passes, and use it in your other passes : in other words, it is a global variable shared between several files.
> 
> Best regards,
> --
> Arnaud de Grandmaison
> 
> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of guyadini
> Sent: Thursday, January 27, 2011 12:38 PM
> To: llvmdev at cs.uiuc.edu
> Subject: Re: [LLVMdev] Passing command line arguments to optimization passes
> 
> 
> A follow-up question:
> Is there a way to make different passes accept one command line option that
> will affect all of them?
> 
> For example, I'd like to have a -optStrength parameter, that can be given to
> all of my passes simultaneously.
> 
> Thanks a lot,
> Guy
> 
> 
> Arnaud Allard de Grandmaison wrote:
>> 
>> Hi Harel,
>> 
>> Several existing passes can take command line arguments. Have a look at
>> lib/Transforms/Scalar/LoopUnrollPass.cpp for example. Its command line
>> arguments are defined using the cl::opt objects.
>> 
>> Best regards,
>> --
>> Arnaud de Grandmaison
>> ________________________________
>> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
>> Behalf Of Harel Cain
>> Sent: Thursday, January 27, 2011 10:05 AM
>> To: llvmdev at cs.uiuc.edu
>> Subject: [LLVMdev] Passing command line arguments to optimization passes
>> 
>> Hi all,
>> 
>> I was wondering if there's any way to pass command line arguments to LLVM
>> optimization passes when run through the opt tool.
>> 
>> For example, suppose I register called MyPass, then I want to run
>> 
>> opt -load libMyPass.so -MyPass 3 < input.bc
>> 
>> and have "3" be available to MyPass as a kind of argv argumnet through
>> some method.
>> 
>> 
>> Or does it take a major rewrite of the opt tool command line parsing?
>> 
>> 
>> Thanks!
>> 
>> Harel Cain
>> 
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>> 
>> 
> 
> --
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