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fix #13790; ptr char (+friends) should not implicitly convert to cstring (#20761)

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* fix =#13790 ptr char (+friends) should not implicitly convert to cstring

* Apply suggestions from code review

* first round; compiles on windows

* nimPreviewSlimSystem

* conversion is unsafe, cast needed

* fixes more tests

* fixes asyncnet

* another try another error

* last one

* true

* one more

* why bugs didn't show at once

* add `nimPreviewCstringConversion` switch

* typo

Co-authored-by: xflywind <43030857+xflywind@users.noreply.github.com>
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ringabout 2022-11-24 14:49:23 +08:00 • committed by GitHub
commit 27a38a9fce
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5 changed files with 19 additions and 12 deletions
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22
compiler/sigmatch.nim
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@ -1391,16 +1391,18 @@ proc typeRel(c: var TCandidate, f, aOrig: PType,
of tyNil: result = f.allowsNil
of tyString: result = isConvertible
of tyPtr:
# ptr[Tag, char] is not convertible to 'cstring' for now:
if a.len == 1:
let pointsTo = a[0].skipTypes(abstractInst)
if pointsTo.kind == tyChar: result = isConvertible
elif pointsTo.kind == tyUncheckedArray and pointsTo[0].kind == tyChar:
result = isConvertible
elif pointsTo.kind == tyArray and firstOrd(nil, pointsTo[0]) == 0 and
skipTypes(pointsTo[0], {tyRange}).kind in {tyInt..tyInt64} and
pointsTo[1].kind == tyChar:
result = isConvertible
if isDefined(c.c.config, "nimPreviewCstringConversion"):
result = isNone
else:
if a.len == 1:
let pointsTo = a[0].skipTypes(abstractInst)
if pointsTo.kind == tyChar: result = isConvertible
elif pointsTo.kind == tyUncheckedArray and pointsTo[0].kind == tyChar:
result = isConvertible
elif pointsTo.kind == tyArray and firstOrd(nil, pointsTo[0]) == 0 and
skipTypes(pointsTo[0], {tyRange}).kind in {tyInt..tyInt64} and
pointsTo[1].kind == tyChar:
result = isConvertible
else: discard
of tyEmpty, tyVoid: