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Small performance improvement in sempass2 (#7168)

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cooldome 2018-02-01 17:34:37 +00:00 • committed by Andreas Rumpf
commit 5460bd2764
1 changed files with 8 additions and 11 deletions
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19
compiler/sempass2.nim
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@ -593,17 +593,14 @@ proc trackOperand(tracked: PEffects, n: PNode, paramType: PType) =
notNilCheck(tracked, n, paramType) notNilCheck(tracked, n, paramType)
proc breaksBlock(n: PNode): bool = proc breaksBlock(n: PNode): bool =
case n.kind # sematic check doesn't allow statements after raise, break, return or
of nkStmtList, nkStmtListExpr: # call to noreturn proc, so it is safe to check just the last statements
for c in n: var it = n
if breaksBlock(c): return true while it.kind in {nkStmtList, nkStmtListExpr} and it.len > 0:
of nkBreakStmt, nkReturnStmt, nkRaiseStmt: it = it.lastSon
return true
of nkCallKinds: result = it.kind in {nkBreakStmt, nkReturnStmt, nkRaiseStmt} or
if n.sons[0].kind == nkSym and sfNoReturn in n.sons[0].sym.flags: it.kind in nkCallKinds and it[0].kind == nkSym and sfNoReturn in it[0].sym.flags
return true
else:
discard
proc trackCase(tracked: PEffects, n: PNode) = proc trackCase(tracked: PEffects, n: PNode) =
track(tracked, n.sons[0]) track(tracked, n.sons[0])