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implements #173

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This commit is contained in:
Araq 2012-07-28 14:16:08 +02:00
commit 538b06a123
11 changed files with 114 additions and 39 deletions
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16
compiler/semexprs.nim
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@ -238,7 +238,6 @@ proc semSizeof(c: PContext, n: PNode): PNode =
else:
n.sons[1] = semExprWithType(c, n.sons[1])
restoreOldStyleType(n.sons[1])
n.typ = getSysType(tyInt)
result = n
@ -252,8 +251,19 @@ proc semOf(c: PContext, n: PNode): PNode =
var b = skipTypes(n.sons[2].typ, abstractPtrs)
if b.kind != tyObject or a.kind != tyObject:
GlobalError(n.info, errXExpectsObjectTypes, "of")
while b != nil and b.id != a.id: b = b.sons[0]
if b == nil:
let diff = inheritanceDiff(a, b)
# | returns: 0 iff `a` == `b`
# | returns: -x iff `a` is the x'th direct superclass of `b`
# | returns: +x iff `a` is the x'th direct subclass of `b`
# | returns: `maxint` iff `a` and `b` are not compatible at all
if diff <= 0:
# optimize to true:
Message(n.info, hintConditionAlwaysTrue, renderTree(n))
result = newIntNode(nkIntLit, 1)
result.info = n.info
result.typ = getSysType(tyBool)
return result
elif diff == high(int):
GlobalError(n.info, errXcanNeverBeOfThisSubtype, typeToString(a))
n.typ = getSysType(tyBool)
else: