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canAlias improvement (#15773)

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* canAlias improvement

* fix comment
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cooldome 2020-10-30 11:42:06 +00:00 • committed by GitHub
commit 6fe2e8977d
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1 changed files with 11 additions and 2 deletions
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compiler/isolation_check.nim
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@ -64,7 +64,16 @@ proc canAlias(arg, ret: PType; marker: var IntSet): bool =
else: else:
result = false result = false
proc isValueOnlyType(t: PType): bool =
# t doesn't contain pointers and references
proc wrap(t: PType): bool {.nimcall.} = t.kind in {tyRef, tyPtr, tyVar, tyLent}
result = not types.searchTypeFor(t, wrap)
proc canAlias*(arg, ret: PType): bool = proc canAlias*(arg, ret: PType): bool =
if isValueOnlyType(arg):
# can alias only with unsafeAddr(arg.x) and we don't care if it is not safe
result = false
else:
var marker = initIntSet() var marker = initIntSet()
result = canAlias(arg, ret, marker) result = canAlias(arg, ret, marker)