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105 :: How do exceptions 'escape' from nimrod to C?

• gradha (orginal) [2012-11-02T19:00:27+01:00] view original

  Let's say I export a nimrod proc which can raise an exception, and this exception is not caught. My C code calls the exported nimrod proc as a C function and the exception happens (hello Murphy!). What will happen at this point with the exception, the execution flow and the handling of the return value? Will the universe implode? Should a C interface of all nimrod procs be wrapped around a try block just in case on the nimrod side and communicate this to the C caller through an error pointer or similar mechanism?

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• Araq (orginal) [2012-11-02T20:26:11+01:00] view original

  An uncaught exception terminates the program.

  Yes you can also wrap every function in a handler (and it's only a macro away to automate that) and expose that to C but you don't have to.

  You also could export the exception handling API to C so that the C code can register exception handlers. Patches are welcome, take a look at lib/system/excpt.nim. I think it amounts to writing some new small header file. ;-)

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