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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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4
compiler/ccgthreadvars.nim
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@ -16,8 +16,8 @@ proc emulatedThreadVars(conf: ConfigRef): bool =
result = {optThreads, optTlsEmulation} <= conf.globalOptions
proc accessThreadLocalVar(p: BProc, s: PSym) =
if emulatedThreadVars(p.config) and not p.threadVarAccessed:
p.threadVarAccessed = true
if emulatedThreadVars(p.config) and threadVarAccessed notin p.flags:
p.flags.incl threadVarAccessed
incl p.module.flags, usesThreadVars
p.procSec(cpsLocals).addf("\tNimThreadVars* NimTV_;$n", [])
p.procSec(cpsInit).add(