llvm dev - Sep 2014 - [LLVMdev] Need guidance regarding MachineFunctionPass implementation

Hello all,

I need to modify llvm bytecode / native code just before it is emitted i.e.
after all the regular operations and optimizations are done. I was told
that this can be achieved by implementing a MachineFunctionPass.
I searched the internet for some tutorials or some example
MachineFunctionPass but found nothing. Kindly point some links, or anything
that may help. Thank you.

Regards,
Sachin
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Hi Sachin,

 

You could check the code in lib/Target/ARM/ARMOptimizeBarriersPass.cpp for an
example of a MachineFunctionPass that runs very late. Look in
lib/Target/ARM/ARMTargetMachine.cpp to see where it is added to the pass
pipeline.

 

-David

 

-- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
The Linux Foundation

 

 

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of sachin arora
Sent: Wednesday, September 17, 2014 1:45 PM
To: llvmdev at cs.uiuc.edu
Subject: [LLVMdev] Need guidance regarding MachineFunctionPass implementation

 

Hello all,

 

I need to modify llvm bytecode / native code just before it is emitted i.e.
after all the regular operations and optimizations are done. I was told that
this can be achieved by implementing a MachineFunctionPass.

I searched the internet for some tutorials or some example MachineFunctionPass
but found nothing. Kindly point some links, or anything that may help. Thank
you.

 

Regards,

Sachin

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Dear Sachin,

You will want to read up on the LLVM Code Generator infrastructure: 
http://llvm.org/docs/CodeGenerator.html#machine-code-description-classes

Also, a MachineFunctionPass is nearly the same as an LLVM FunctionPass 
except that it operations on MachineFunction objects instead of Function 
objects.  If you read the "Writing an LLVM Pass" document 
(http://llvm.org/docs/WritingAnLLVMPass.html) and understand how to use 
MachineInstr's, MachineBasicBlocks, and MachineInstr's, you should be 
able to figure it out.

Finally, take a look at the doxygen documentation anytime you need 
details on how to use a specific LLVM class, and as David suggested, 
take a look at existing code.

Regards,

John Criswell


On 9/17/14, 4:44 PM, sachin arora wrote:
> Hello all,
>
> I need to modify llvm bytecode / native code just before it is emitted 
> i.e. after all the regular operations and optimizations are done. I 
> was told that this can be achieved by implementing a MachineFunctionPass.
> I searched the internet for some tutorials or some example 
> MachineFunctionPass but found nothing. Kindly point some links, or 
> anything that may help. Thank you.
>
> Regards,
> Sachin
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Thank you Mr. John and Mr. David !

Regards,
Vipin

On Wed, Sep 17, 2014 at 6:21 PM, John Criswell <jtcriswel at gmail.com>
wrote:
>  Dear Sachin,
>
> You will want to read up on the LLVM Code Generator infrastructure:
> http://llvm.org/docs/CodeGenerator.html#machine-code-description-classes
>
> Also, a MachineFunctionPass is nearly the same as an LLVM FunctionPass
> except that it operations on MachineFunction objects instead of Function
> objects.  If you read the "Writing an LLVM Pass" document (
> http://llvm.org/docs/WritingAnLLVMPass.html) and understand how to use
> MachineInstr's, MachineBasicBlocks, and MachineInstr's, you should
be able
> to figure it out.
>
> Finally, take a look at the doxygen documentation anytime you need details
> on how to use a specific LLVM class, and as David suggested, take a look at
> existing code.
>
> Regards,
>
> John Criswell
>
>
>
> On 9/17/14, 4:44 PM, sachin arora wrote:
>
> Hello all,
>
>  I need to modify llvm bytecode / native code just before it is emitted
> i.e. after all the regular operations and optimizations are done. I was
> told that this can be achieved by implementing a MachineFunctionPass.
> I searched the internet for some tutorials or some example
> MachineFunctionPass but found nothing. Kindly point some links, or anything
> that may help. Thank you.
>
>  Regards,
> Sachin
>
>
> _______________________________________________
> LLVM Developers mailing listLLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
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