[LLVMdev] [un]wrapping llvm:DITypeRef (original) (raw)

Andrew Wilkins axwalk at gmail.com
Sat Jul 25 18:57:23 PDT 2015

On Sun, 26 Jul 2015 at 06:48 Rodney M. Bates <rodney_bates at lcwb.coop> wrote:

In trying to write a C binding for DIBuilder of llvm 3.6.1, I can't see a way to unwrap llvm::DITypeRef, declared in include/llvm/IR/DebugInfo.h. This is a class with one data member, a pointer to Metadata.

If I try to make my C type a struct with one pointer, I can't cast it to DITypeRef. If I try to go inside the classes and use the pointer, I can cast, but can't construct a DITypeRef when unwrapping, as both its pointer field 'Val' and the constructor are private.

I don't know if I'm understanding the problem exactly, so I'll just point you to what the Go bindings are doing.

First, define wrap/unwrap for llvm::Metadata (of which DIType is a descendant):

http://llvm.org/klaus/llvm/blob/master/bindings/go/llvm/IRBindings.h#L-63

Then use wrapped llvm::Metadata in the C API:

http://llvm.org/klaus/llvm/blob/master/bindings/go/llvm/DIBuilderBindings.h

(You could have DIType-specific wrap/unwrap too, using the same method.)

HTH, Andrew -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150726/2b53a0c4/attachment.html>

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