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--exception:goto switch for deterministic exception handling (#12977)

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This implements "deterministic" exception handling for Nim based on goto instead of setjmp. This means raising an exception is much cheaper than in C++'s table based implementations. Supports hard realtime systems. Default for --gc:arc and the C target because it's generally a good idea and arc is all about deterministic behavior.

Note: This implies that fatal runtime traps are not catchable anymore! This needs to be documented.
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Andreas Rumpf 2020-01-01 10:01:49 +01:00 • committed by GitHub
commit c3344862b0
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23 changed files with 640 additions and 183 deletions
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compiler/condsyms.nim
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@ -102,3 +102,4 @@ proc initDefines*(symbols: StringTableRef) =
defineSymbol("nimnomagic64")
defineSymbol("nimNewShiftOps")
defineSymbol("nimHasCursor")
defineSymbol("nimHasExceptionsQuery")