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fixes #20954; bounchecks for len(toOpenArray()) [backport] (#20956)

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* bounchecks for len(toOpenArray())

* add a testcase
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ringabout 2022-12-06 05:27:18 +08:00 • committed by GitHub
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compiler/ccgexprs.nim
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@ -1879,9 +1879,13 @@ proc genArrayLen(p: BProc, e: PNode, d: var TLoc, op: TMagic) =
# Bug #9279, len(toOpenArray()) has to work:
if a.kind in nkCallKinds and a[0].kind == nkSym and a[0].sym.magic == mSlice:
# magic: pass slice to openArray:
var m: TLoc
var b, c: TLoc
initLocExpr(p, a[1], m)
initLocExpr(p, a[2], b)
initLocExpr(p, a[3], c)
if optBoundsCheck in p.options:
genBoundsCheck(p, m, b, c)
if op == mHigh:
putIntoDest(p, d, e, ropecg(p.module, "($2)-($1)", [rdLoc(b), rdLoc(c)]))
else: