[LLVMdev] Implementing customized intrinsic

[Tanya M. Lattner]

Does the llvm annotation intrinsic not work for what you are trying to do?

http://llvm.org/docs/LangRef.html#int_var_annotation
http://llvm.org/docs/LangRef.html#int_annotation

-Tanya

On Wed, 21 Jan 2009, Haohui Mai wrote:

> Dear all,
>
> Currently I'm working on a project that add various checks into the
> LLVM bitcode. For example,  I insert function calls before every
> load / store instructions to guarantee that these instructions are
> safe. I really want to implement them as LLVM intrinsics or ``special
> function calls'' so that I am able to leverage the power of things
> like InstVisitor. However, it seems it is difficult to do it without
> changing LLVM's source codes, cause
>
> i) all constructors of CallInst are private
> ii) There's no interfaces for implementing customized intrinsics
> (without changing intrinsics*.td)
>
> It is very helpful to mark these checks as special calls (like
> intrinsics), it would ease the implementation of optimizations since
> they only work on these special calls, say, I could save some
> information in the subclass of CallInst.
>
> I also notice that the access identifier of CallInst are changed after
> LLVM 2.0. I would be appreciated if you guys could explain the
> rationale behind the changes.
>
> Thank you very much.
>
> Best,
>
> Haohui
>
>
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