How to insert a function in LLVM module

Question

I am writing an LLVM pass, where I clone some functions by calling llvm::CloneFunction. Now I also want to insert those functions in the module. How can I do that?

I am trying to find an LLVM API function that does that, but still am unable to find one. — MetallicPriest
– MetallicPriest, Commented Feb 4, 2013 at 13:06

MetallicPriest · Accepted Answer · 2013-02-04 14:58:07Z

9

Create a new function with Function::Create or by other means. A Function's constructors accept a module into which to insert the new function.
Clone a function into that new function with CloneFunctionInto, or just copy over the BBs you need.

edited Feb 4, 2013 at 14:58

MetallicPriest

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answered Feb 4, 2013 at 13:31

Eli Bendersky

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Joe Todd · Accepted Answer · 2022-02-11 11:25:05Z

0

CloneFunction will automatically insert the new Function into the old Function's module. From the doxygen:

Return a copy of the specified function and add it to that function's module.

answered Feb 11, 2022 at 11:25

Joe Todd

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Jeremy Salwen · Accepted Answer · 2014-08-05 06:26:59Z

-1

You can use CloneFunction and insert it into the module afterwards like so

  Function* duplicateFunction = CloneFunction(F, VMap,
                                              /*ModuleLevelChanges=*/false);
  F->getParent()->getFunctionList().push_back(duplicateFunction);

Example stolen from PartialInlining.cpp in the llvm source.

answered Aug 5, 2014 at 6:26

Jeremy Salwen

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