llvm dev - Jul 2015 - [LLVMdev] Dynamically loadable pass doesn't show up in opt's pass list

Hi All!

I'd like to create a dynamically loadable version of the SLP vectorizer 
pass which should be named differently than the original (e.g. 
'slp-mod'). (The reason for why I'd like this is that I need to
modify
the pass and I'd like a quick modify/build/test cycle.)

I copied the file to a separate directory (SLPVectorizer.cpp -> 
my_pass/SLPMod.cpp), renamed the SLPVectorizer class to SLPMod and use 
the same pass registration as in the original pass:

#define SV_NAME "slp-mod"
#define DEBUG_TYPE "SLPMod"

static const char lv_name[] = "SLP Mod";
INITIALIZE_PASS_BEGIN(SLPMod, SV_NAME, lv_name, false, false)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
INITIALIZE_AG_DEPENDENCY(TargetTransformInfo)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
INITIALIZE_PASS_END(SLPMod, SV_NAME, lv_name, false, false)

I got this to build and 'opt' seems to succeed in dynamically loading 
it. However, the pass is not callable with -slp-mod, nor does it show up 
in the pass list with -help.

Is the way as above indicated correct for registration of a dynamically 
loadable pass?

Thanks,
Frank

For the record: Removing the pass interaction statements and adding the 
single pass registration worked for me (of course one has to provide a 
default constructor):

char SLPMod::ID = 0;
static RegisterPass<SLPMod> X(SV_NAME, "SLPMod");

#if 0
static const char lv_name[] = "SLP Mod";
INITIALIZE_PASS_BEGIN(SLPMod, SV_NAME, lv_name, false, false)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
INITIALIZE_AG_DEPENDENCY(TargetTransformInfo)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
INITIALIZE_PASS_END(SLPMod, SV_NAME, lv_name, false, false)
#endif

Strange! I thought that was so important.

Frank



On 07/07/2015 12:31 PM, Frank Winter wrote:
> Hi All!
>
> I'd like to create a dynamically loadable version of the SLP 
> vectorizer pass which should be named differently than the original 
> (e.g. 'slp-mod'). (The reason for why I'd like this is that I
need to
> modify the pass and I'd like a quick modify/build/test cycle.)
>
> I copied the file to a separate directory (SLPVectorizer.cpp -> 
> my_pass/SLPMod.cpp), renamed the SLPVectorizer class to SLPMod and use 
> the same pass registration as in the original pass:
>
> #define SV_NAME "slp-mod"
> #define DEBUG_TYPE "SLPMod"
>
> static const char lv_name[] = "SLP Mod";
> INITIALIZE_PASS_BEGIN(SLPMod, SV_NAME, lv_name, false, false)
> INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
> INITIALIZE_AG_DEPENDENCY(TargetTransformInfo)
> INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
> INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
> INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
> INITIALIZE_PASS_END(SLPMod, SV_NAME, lv_name, false, false)
>
> I got this to build and 'opt' seems to succeed in dynamically
loading
> it. However, the pass is not callable with -slp-mod, nor does it show 
> up in the pass list with -help.
>
> Is the way as above indicated correct for registration of a 
> dynamically loadable pass?
>
> Thanks,
> Frank
>
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev