llvm dev - Aug 2011 - [LLVMdev] extracting sub-program using specified top level function name

Hi,
     I am interested in getting llvm IR only for a subset of the input source
code - basically starting from a specified top level function, including all its
callee functions (recursively).

     For example, in the following code, I am interested in a command like
"extract -top_function blah()" that will create an llvm IR with just
blah() and foo().


      int foo() {
          ...

      }

       int blah() {
             foo()
       }

        int junk() {
             blah();
        }

        int main() {
             junk();
        }

    I can imagine writing some kind of FunctionPass that filters for specified
function etc. But is there already some pass/command/tool that already does
something similar?

    Thanks in advance for helping a newbie!

-Ananth
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fixing missing subject line in original email.

----- Forwarded Message -----
From: Ananth Durbha <avdurbha at yahoo.com>
To: llvm list <llvmdev at cs.uiuc.edu>
Sent: Tuesday, August 9, 2011 11:38 PM
Subject: 


Hi,
     I am interested in getting llvm IR only for a subset of the input source
code - basically starting from a specified top level function, including all its
callee functions (recursively).

     For example, in the following code, I am interested in a command like
"extract -top_function blah()" that will create an llvm IR with just
blah() and foo().


      int foo() {
          ...

      }

       int blah() {
             foo()
       }

        int junk() {
             blah();
        }

        int main() {
             junk();
        }

    I can imagine writing some kind of FunctionPass that filters for specified
function etc. But is there already some pass/command/tool that already does
something similar?

    Thanks in advance for helping a newbie!

-Ananth
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Hi Ananth,

I'm not sure about a tool that already does it, but there is code to
construct a callgraph that you could use to write a pass to do this.

On Tue, Aug 9, 2011 at 11:38 PM, Ananth Durbha <avdurbha at yahoo.com>
wrote:
> Hi,
>      I am interested in getting llvm IR only for a subset of the input
> source code - basically starting from a specified top level function,
> including all its callee functions (recursively).
>
>      For example, in the following code, I am interested in a command like
> "extract -top_function blah()" that will create an llvm IR with
just blah()
> and foo().
>
>       int foo() {
>           ...
>       }
>
>        int blah() {
>              foo()
>        }
>
>         int junk() {
>              blah();
>         }
>
>         int main() {
>              junk();
>         }
>
>     I can imagine writing some kind of FunctionPass that filters for
> specified function etc. But is there already some pass/command/tool that
> already does something similar?
>
>     Thanks in advance for helping a newbie!
>
> -Ananth
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>

-- 
gregory malecha
http://www.people.fas.harvard.edu/~gmalecha/
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Have you looked at llvm-extract tool ?
-
Devang

On Aug 9, 2011, at 11:40 PM, Ananth Durbha wrote:
> fixing missing subject line in original email.
> 
> ----- Forwarded Message -----
> From: Ananth Durbha <avdurbha at yahoo.com>
> To: llvm list <llvmdev at cs.uiuc.edu>
> Sent: Tuesday, August 9, 2011 11:38 PM
> Subject: 
> 
> Hi,
>      I am interested in getting llvm IR only for a subset of the input
source code - basically starting from a specified top level function, including
all its callee functions (recursively).
> 
>      For example, in the following code, I am interested in a command like
"extract -top_function blah()" that will create an llvm IR with just
blah() and foo().
> 
>       int foo() {
>           ...
>       }
> 
>        int blah() {
>              foo()
>        }
> 
>         int junk() {
>              blah();
>         }
> 
>         int main() {
>              junk();
>         }
> 
>     I can imagine writing some kind of FunctionPass that filters for
specified function etc. But is there already some pass/command/tool that already
does something similar?
> 
>     Thanks in advance for helping a newbie!
> 
> -Ananth
> 
> 
> _______________________________________________
> 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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