jyapayne/Nim
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

don't allow casting to non-concrete types; fixes #5428 (#5502)

Browse source
This commit is contained in:
zah 2017-03-12 10:27:05 +02:00 • committed by Andreas Rumpf
commit 6e358e3187
4 changed files with 58 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

13
compiler/semexprs.nim
View file

@ -218,13 +218,16 @@ proc semConv(c: PContext, n: PNode): PNode =
proc semCast(c: PContext, n: PNode): PNode =
## Semantically analyze a casting ("cast[type](param)")
checkSonsLen(n, 2)
let targetType = semTypeNode(c, n.sons[0], nil)
let castedExpr = semExprWithType(c, n.sons[1])
if tfHasMeta in targetType.flags:
localError(n.sons[0].info, errCastToANonConcreteType, $targetType)
if not isCastable(targetType, castedExpr.typ):
localError(n.info, errExprCannotBeCastToX, $targetType)
result = newNodeI(nkCast, n.info)
result.typ = semTypeNode(c, n.sons[0], nil)
result.typ = targetType
addSon(result, copyTree(n.sons[0]))
addSon(result, semExprWithType(c, n.sons[1]))
if not isCastable(result.typ, result.sons[1].typ):
localError(result.info, errExprCannotBeCastToX,
typeToString(result.typ))
addSon(result, castedExpr)
proc semLowHigh(c: PContext, n: PNode, m: TMagic): PNode =
const