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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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4
compiler/sempass2.nim
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@ -167,9 +167,7 @@ proc guardDotAccess(a: PEffects; n: PNode) =
guardGlobal(a, n, g)
proc makeVolatile(a: PEffects; s: PSym) {.inline.} =
template compileToCpp(a): untyped =
a.config.cmd == cmdCompileToCpp or sfCompileToCpp in getModule(a.owner).flags
if a.inTryStmt > 0 and not compileToCpp(a):
if a.inTryStmt > 0 and a.config.exc == excSetjmp:
incl(s.flags, sfVolatile)
proc initVar(a: PEffects, n: PNode; volatileCheck: bool) =