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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.
This commit is contained in:
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/pragmas.nim
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@ -880,7 +880,7 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
of wNoreturn:
noVal(c, it)
# Disable the 'noreturn' annotation when in the "Quirky Exceptions" mode!
if not isDefined(c.config, "nimQuirky"):
if c.config.exc notin {excQuirky, excGoto}:
incl(sym.flags, sfNoReturn)
if sym.typ[0] != nil:
localError(c.config, sym.ast[paramsPos][0].info,