[llvm-dev] multi-entry function (debug info) (original) (raw)

Roger Ferrer Ibáñez via llvm-dev llvm-dev at lists.llvm.org
Tue Oct 23 09:07:32 PDT 2018

Regarding multi-entry functions, I'm aware of two cases where this occurs in a source language. One is when you have optional parameters in C++, which effectively creates one or more overloads for the function; the other is PL/I which allows defining an entry label within the body of the function. For the C++ case, I'd expect the front-end to create stubs that fill in the defaulted parameters and then tail-call the main function; in this case, each stub would have its own debug-info entry and be treated as its own independent function for debug-info purposes. For PL/I, I would probably do the same, although I admit it has been a long time since I did any PL/I programming and I never worked on a PL/I compiler.

Another example of source language with functions that can have more than entry point is Fortran via the ENTRY statement. I think most compilers use an extra integer parameter to discriminate between the different entry points at the call sites. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20181023/1410aa60/attachment.html>

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