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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/ccgcalls.nim
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@ -567,6 +567,8 @@ proc genCall(p: BProc, e: PNode, d: var TLoc) =
else:
genPrefixCall(p, nil, e, d)
postStmtActions(p)
if p.config.exc == excGoto and canRaise(e[0]):
raiseExit(p)
proc genAsgnCall(p: BProc, le, ri: PNode, d: var TLoc) =
if ri[0].typ.skipTypes({tyGenericInst, tyAlias, tySink, tyOwned}).callConv == ccClosure:
@ -578,3 +580,5 @@ proc genAsgnCall(p: BProc, le, ri: PNode, d: var TLoc) =
else:
genPrefixCall(p, le, ri, d)
postStmtActions(p)
if p.config.exc == excGoto and canRaise(ri[0]):
raiseExit(p)