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DAA and 'out' parameters (#20506)

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* DAA and 'out' parameters

* progress

* documented strictDefs and out parameters

* docs, tests and a bugfix

* fixes silly regression
This commit is contained in:
Andreas Rumpf 2022-10-06 17:08:41 +02:00 • committed by GitHub
commit 0d23419e68
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17 changed files with 289 additions and 53 deletions
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7
compiler/dfa.nim
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@ -381,10 +381,9 @@ proc genCall(c: var Con; n: PNode) =
if t != nil: t = t.skipTypes(abstractInst)
for i in 1..<n.len:
gen(c, n[i])
when false:
if t != nil and i < t.len and t[i].kind == tyOut:
# Pass by 'out' is a 'must def'. Good enough for a move optimizer.
genDef(c, n[i])
if t != nil and i < t.len and isOutParam(t[i]):
# Pass by 'out' is a 'must def'. Good enough for a move optimizer.
genDef(c, n[i])
# every call can potentially raise:
if false: # c.inTryStmt > 0 and canRaiseConservative(n[0]):
# we generate the instruction sequence: