LLVM exception throwing

Question

I have read this blog post, this documentation page and this example, but I still don't understand how to throw a basic exception using the LLVM's IRBuilder for a non-C++ oriented language.

From my understanding, I have to :

• Create a llvm::Value containing the throwed value.
• Call "a function", passing it the throwed value. This function will not return.

The example is using a system rewinding function (_Unwind_RaiseException) in order to throw a C++ exception, and I don't really understand how to use my own raising function instead (since I only need to throw an object pointer). What am I missing ?

Answer 1

Short answer is that _Unwind_RaiseException is not a C++-specific function. It comes from the libunwind library, and allows to throw any type of exception.

More details can be found on these blog posts.