llvm dev - Oct 2008 - [LLVMdev] Is it possible to use EE within optimization pass?

Thanks John! My pass is registered only in 1 cpp file. It registers and executes
fine without the EE.

I only get the Pass registered multiple times error when I try to link to the EE
by using LINK_COMPONENTS=engine in the Makefile. Without that line in the
Makefile, my pass gets registered fine but it is not able to create EE(Error
reading Symbol). So, how do I link LLVMExecutionEngine.o without causing the
multiple registration error.

thanks,
Bhavani

--- On Mon, 10/27/08, John Criswell <criswell at cs.uiuc.edu> wrote:
> From: John Criswell <criswell at cs.uiuc.edu>
> Subject: Re: [LLVMdev] Is it possible to use EE within optimization pass?
> To: "bhavi63 at yahoo.com" <bhavi63 at yahoo.com>,
"LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Date: Monday, October 27, 2008, 3:01 PM
> bhavani krishnan wrote:
> > Hi all,
> >
> > I am repeating my question from yesterday coz I need
> to find a solution to this ASAP. 
> >
> > How do I link the executionengine to an optimization
> pass. If I use LINK_COMPONENTS=engine in the Makefile, I get
> the Pass registered multiple times error. And if i dont use
> anything, it is not able to load the EE. It gives error
> loading symbol error. So,
> > 1. Is it possible to use the EE within an optimization
> pass?
> > 2. If it is possible, how do I do it?
> >   
> I have a hunch that I know what your problem is.
> 
> You said that your pass is getting registered twice.  Are
> you sure that 
> your RegisterPass declaration is only being called once?  A
> common error 
> is to put the RegisterPass<MyPass> Foo variable
> inside a header file 
> that gets included by multiple .cpp files implementing your
> pass (I'm 
> assuming you've written a custom pass here).  This will
> cause your pass 
> to get registered multiple times, which will make the LLVM
> pass manager 
> unhappy.
> 
> I believe this is because the RegisterPass<>
> constructor does pass 
> registration, so if it's declared multiple times, it
> registers the pass 
> multiple times.
> 
> To fix it, put RegisterPass<YourPassName> inside one
> of the .cpp files 
> implementing your pass.
> 
> Regarding your more specific questions, I suspect that EE
> can be used 
> with the Pass Manager to run optimization passes, but
> that's just a 
> guess on my part; I have never done it myself.  I suspect
> the issue is 
> just getting the right libraries listed in LINK_COMPONENTS
> and making 
> sure your pass isn't registered twice.
> 
> Please let us know if the RegisterPass thing is the problem
> and whether 
> the solution above fixes it.
> 
> Regards,
> 
> -- John T.
> 
> 
> > Please help me out here!
> > Thanks,
> > Bhavani
> >
> >
> >
> >       
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >

bhavani krishnan wrote:
> Thanks John! My pass is registered only in 1 cpp file. It registers and
executes fine without the EE.
>
> I only get the Pass registered multiple times error when I try to link to
the EE by using LINK_COMPONENTS=engine in the Makefile. Without that line in the
Makefile, my pass gets registered fine but it is not able to create EE(Error
reading Symbol). So, how do I link LLVMExecutionEngine.o without causing the
multiple registration error.
>   
Just to make sure we've covered all the obvious stuff, are you sure that 
the name of your pass (the name you use when you execute it with the opt 
command) is unique?  Is the class name of your pass unique?

-- John T.
> thanks,
> Bhavani
>
> --- On Mon, 10/27/08, John Criswell <criswell at cs.uiuc.edu> wrote:
>
>   
>> From: John Criswell <criswell at cs.uiuc.edu>
>> Subject: Re: [LLVMdev] Is it possible to use EE within optimization
pass?
>> To: "bhavi63 at yahoo.com" <bhavi63 at yahoo.com>,
"LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
>> Date: Monday, October 27, 2008, 3:01 PM
>> bhavani krishnan wrote:
>>     
>>> Hi all,
>>>
>>> I am repeating my question from yesterday coz I need
>>>       
>> to find a solution to this ASAP. 
>>     
>>> How do I link the executionengine to an optimization
>>>       
>> pass. If I use LINK_COMPONENTS=engine in the Makefile, I get
>> the Pass registered multiple times error. And if i dont use
>> anything, it is not able to load the EE. It gives error
>> loading symbol error. So,
>>     
>>> 1. Is it possible to use the EE within an optimization
>>>       
>> pass?
>>     
>>> 2. If it is possible, how do I do it?
>>>   
>>>       
>> I have a hunch that I know what your problem is.
>>
>> You said that your pass is getting registered twice.  Are
>> you sure that 
>> your RegisterPass declaration is only being called once?  A
>> common error 
>> is to put the RegisterPass<MyPass> Foo variable
>> inside a header file 
>> that gets included by multiple .cpp files implementing your
>> pass (I'm 
>> assuming you've written a custom pass here).  This will
>> cause your pass 
>> to get registered multiple times, which will make the LLVM
>> pass manager 
>> unhappy.
>>
>> I believe this is because the RegisterPass<>
>> constructor does pass 
>> registration, so if it's declared multiple times, it
>> registers the pass 
>> multiple times.
>>
>> To fix it, put RegisterPass<YourPassName> inside one
>> of the .cpp files 
>> implementing your pass.
>>
>> Regarding your more specific questions, I suspect that EE
>> can be used 
>> with the Pass Manager to run optimization passes, but
>> that's just a 
>> guess on my part; I have never done it myself.  I suspect
>> the issue is 
>> just getting the right libraries listed in LINK_COMPONENTS
>> and making 
>> sure your pass isn't registered twice.
>>
>> Please let us know if the RegisterPass thing is the problem
>> and whether 
>> the solution above fixes it.
>>
>> Regards,
>>
>> -- John T.
>>
>>
>>     
>>> Please help me out here!
>>> Thanks,
>>> Bhavani
>>>
>>>
>>>
>>>       
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>       
>
>
>       
>

I think so. I am using the name try. 


--- On Mon, 10/27/08, John Criswell <criswell at cs.uiuc.edu> wrote:
> From: John Criswell <criswell at cs.uiuc.edu>
> Subject: Re: [LLVMdev] Is it possible to use EE within optimization pass?
> To: "bhavi63 at yahoo.com" <bhavi63 at yahoo.com>
> Cc: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Date: Monday, October 27, 2008, 3:22 PM
> bhavani krishnan wrote:
> > Thanks John! My pass is registered only in 1 cpp file.
> It registers and executes fine without the EE.
> >
> > I only get the Pass registered multiple times error
> when I try to link to the EE by using LINK_COMPONENTS=engine
> in the Makefile. Without that line in the Makefile, my pass
> gets registered fine but it is not able to create EE(Error
> reading Symbol). So, how do I link LLVMExecutionEngine.o
> without causing the multiple registration error.
> >   
> Just to make sure we've covered all the obvious stuff,
> are you sure that 
> the name of your pass (the name you use when you execute it
> with the opt 
> command) is unique?  Is the class name of your pass unique?
> 
> -- John T.
> 
> > thanks,
> > Bhavani
> >
> > --- On Mon, 10/27/08, John Criswell
> <criswell at cs.uiuc.edu> wrote:
> >
> >   
> >> From: John Criswell <criswell at cs.uiuc.edu>
> >> Subject: Re: [LLVMdev] Is it possible to use EE
> within optimization pass?
> >> To: "bhavi63 at yahoo.com"
> <bhavi63 at yahoo.com>, "LLVM Developers Mailing
> List" <llvmdev at cs.uiuc.edu>
> >> Date: Monday, October 27, 2008, 3:01 PM
> >> bhavani krishnan wrote:
> >>     
> >>> Hi all,
> >>>
> >>> I am repeating my question from yesterday coz
> I need
> >>>       
> >> to find a solution to this ASAP. 
> >>     
> >>> How do I link the executionengine to an
> optimization
> >>>       
> >> pass. If I use LINK_COMPONENTS=engine in the
> Makefile, I get
> >> the Pass registered multiple times error. And if i
> dont use
> >> anything, it is not able to load the EE. It gives
> error
> >> loading symbol error. So,
> >>     
> >>> 1. Is it possible to use the EE within an
> optimization
> >>>       
> >> pass?
> >>     
> >>> 2. If it is possible, how do I do it?
> >>>   
> >>>       
> >> I have a hunch that I know what your problem is.
> >>
> >> You said that your pass is getting registered
> twice.  Are
> >> you sure that 
> >> your RegisterPass declaration is only being called
> once?  A
> >> common error 
> >> is to put the RegisterPass<MyPass> Foo
> variable
> >> inside a header file 
> >> that gets included by multiple .cpp files
> implementing your
> >> pass (I'm 
> >> assuming you've written a custom pass here). 
> This will
> >> cause your pass 
> >> to get registered multiple times, which will make
> the LLVM
> >> pass manager 
> >> unhappy.
> >>
> >> I believe this is because the RegisterPass<>
> >> constructor does pass 
> >> registration, so if it's declared multiple
> times, it
> >> registers the pass 
> >> multiple times.
> >>
> >> To fix it, put RegisterPass<YourPassName>
> inside one
> >> of the .cpp files 
> >> implementing your pass.
> >>
> >> Regarding your more specific questions, I suspect
> that EE
> >> can be used 
> >> with the Pass Manager to run optimization passes,
> but
> >> that's just a 
> >> guess on my part; I have never done it myself.  I
> suspect
> >> the issue is 
> >> just getting the right libraries listed in
> LINK_COMPONENTS
> >> and making 
> >> sure your pass isn't registered twice.
> >>
> >> Please let us know if the RegisterPass thing is
> the problem
> >> and whether 
> >> the solution above fixes it.
> >>
> >> Regards,
> >>
> >> -- John T.
> >>
> >>
> >>     
> >>> Please help me out here!
> >>> Thanks,
> >>> Bhavani
> >>>
> >>>
> >>>
> >>>       
> >>>
> _______________________________________________
> >>> LLVM Developers mailing list
> >>> LLVMdev at cs.uiuc.edu        
> http://llvm.cs.uiuc.edu
> >>>
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >>>
> >>>       
> >
> >
> >       
> >

I realize my questions may not have been so clear. To give more details. I am
writing a fuction pass. I want to interpret some of the instructions within the
function pass. In order to do so, I need to create an EE object within the
function pass. Now, If I compile and execute using opt. I get an error(Error
loading symbol) at the line where I am creating EE.
opt: symbol lookup error: ../../../build/Release/lib/Try.so: undefined symbol:
_ZN4llvm15ExecutionEngine6createEPNS_14ModuleProviderEbPSs

So, I thought I need to link the EE library files as it is not able to load EE.
In order to do so, I added the line LINK_COMPONENTS=engine to the Makefile. Now,
when I execute using opt, I get the error that the pass is registered multiple
times. I know that there has to be a way out of this. Please let me know how I
should link/load the EE library files with my optimization pass.

I hope the question is clear now. Sorry for repeating so many times.
thanks,
Bhavani


--- On Mon, 10/27/08, John Criswell <criswell at cs.uiuc.edu> wrote:
> From: John Criswell <criswell at cs.uiuc.edu>
> Subject: Re: [LLVMdev] Is it possible to use EE within optimization pass?
> To: "bhavi63 at yahoo.com" <bhavi63 at yahoo.com>
> Cc: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Date: Monday, October 27, 2008, 3:22 PM
> bhavani krishnan wrote:
> > Thanks John! My pass is registered only in 1 cpp file.
> It registers and executes fine without the EE.
> >
> > I only get the Pass registered multiple times error
> when I try to link to the EE by using LINK_COMPONENTS=engine
> in the Makefile. Without that line in the Makefile, my pass
> gets registered fine but it is not able to create EE(Error
> reading Symbol). So, how do I link LLVMExecutionEngine.o
> without causing the multiple registration error.
> >   
> Just to make sure we've covered all the obvious stuff,
> are you sure that 
> the name of your pass (the name you use when you execute it
> with the opt 
> command) is unique?  Is the class name of your pass unique?
> 
> -- John T.
> 
> > thanks,
> > Bhavani
> >
> > --- On Mon, 10/27/08, John Criswell
> <criswell at cs.uiuc.edu> wrote:
> >
> >   
> >> From: John Criswell <criswell at cs.uiuc.edu>
> >> Subject: Re: [LLVMdev] Is it possible to use EE
> within optimization pass?
> >> To: "bhavi63 at yahoo.com"
> <bhavi63 at yahoo.com>, "LLVM Developers Mailing
> List" <llvmdev at cs.uiuc.edu>
> >> Date: Monday, October 27, 2008, 3:01 PM
> >> bhavani krishnan wrote:
> >>     
> >>> Hi all,
> >>>
> >>> I am repeating my question from yesterday coz
> I need
> >>>       
> >> to find a solution to this ASAP. 
> >>     
> >>> How do I link the executionengine to an
> optimization
> >>>       
> >> pass. If I use LINK_COMPONENTS=engine in the
> Makefile, I get
> >> the Pass registered multiple times error. And if i
> dont use
> >> anything, it is not able to load the EE. It gives
> error
> >> loading symbol error. So,
> >>     
> >>> 1. Is it possible to use the EE within an
> optimization
> >>>       
> >> pass?
> >>     
> >>> 2. If it is possible, how do I do it?
> >>>   
> >>>       
> >> I have a hunch that I know what your problem is.
> >>
> >> You said that your pass is getting registered
> twice.  Are
> >> you sure that 
> >> your RegisterPass declaration is only being called
> once?  A
> >> common error 
> >> is to put the RegisterPass<MyPass> Foo
> variable
> >> inside a header file 
> >> that gets included by multiple .cpp files
> implementing your
> >> pass (I'm 
> >> assuming you've written a custom pass here). 
> This will
> >> cause your pass 
> >> to get registered multiple times, which will make
> the LLVM
> >> pass manager 
> >> unhappy.
> >>
> >> I believe this is because the RegisterPass<>
> >> constructor does pass 
> >> registration, so if it's declared multiple
> times, it
> >> registers the pass 
> >> multiple times.
> >>
> >> To fix it, put RegisterPass<YourPassName>
> inside one
> >> of the .cpp files 
> >> implementing your pass.
> >>
> >> Regarding your more specific questions, I suspect
> that EE
> >> can be used 
> >> with the Pass Manager to run optimization passes,
> but
> >> that's just a 
> >> guess on my part; I have never done it myself.  I
> suspect
> >> the issue is 
> >> just getting the right libraries listed in
> LINK_COMPONENTS
> >> and making 
> >> sure your pass isn't registered twice.
> >>
> >> Please let us know if the RegisterPass thing is
> the problem
> >> and whether 
> >> the solution above fixes it.
> >>
> >> Regards,
> >>
> >> -- John T.
> >>
> >>
> >>     
> >>> Please help me out here!
> >>> Thanks,
> >>> Bhavani
> >>>
> >>>
> >>>
> >>>       
> >>>
> _______________________________________________
> >>> LLVM Developers mailing list
> >>> LLVMdev at cs.uiuc.edu        
> http://llvm.cs.uiuc.edu
> >>>
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >>>
> >>>       
> >
> >
> >       
> >