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Do not materialize empty varargs[untyped] arrays (#8715)

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When an empty nkArgList `varargs[untyped]` is passed around it is now
reused for efficiency sake and to prevent the introduction of a spurious
element: before this commit we'd pass the caller a
nkArgList[nkHiddenStdConv[nkBracket]] node instead of just an empty
nkArgList.

Fixes #8706
This commit is contained in:
LemonBoy 2018-08-31 12:16:46 +02:00 • committed by Andreas Rumpf
commit b74faf354e
2 changed files with 38 additions and 6 deletions
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23
compiler/sigmatch.nim
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@ -2231,12 +2231,20 @@ proc matchesAux(c: PContext, n, nOrig: PNode,
if a >= formalLen-1 and f < formalLen and m.callee.n[f].typ.isVarargsUntyped:
formal = m.callee.n.sons[f].sym
incl(marker, formal.position)
if container.isNil:
container = newNodeIT(nkArgList, n.sons[a].info, arrayConstr(c, n.info))
setSon(m.call, formal.position + 1, container)
if n.sons[a].kind == nkHiddenStdConv:
doAssert n.sons[a].sons[0].kind == nkEmpty and
n.sons[a].sons[1].kind == nkArgList and
n.sons[a].sons[1].len == 0
# Steal the container and pass it along
setSon(m.call, formal.position + 1, n.sons[a].sons[1])
else:
incrIndexType(container.typ)
addSon(container, n.sons[a])
if container.isNil:
container = newNodeIT(nkArgList, n.sons[a].info, arrayConstr(c, n.info))
setSon(m.call, formal.position + 1, container)
else:
incrIndexType(container.typ)
addSon(container, n.sons[a])
elif n.sons[a].kind == nkExprEqExpr:
# named param
# check if m.callee has such a param:
@ -2400,7 +2408,10 @@ proc matches*(c: PContext, n, nOrig: PNode, m: var TCandidate) =
if not containsOrIncl(marker, formal.position):
if formal.ast == nil:
if formal.typ.kind == tyVarargs:
var container = newNodeIT(nkBracket, n.info, arrayConstr(c, n.info))
# For consistency with what happens in `matchesAux` select the
# container node kind accordingly
let cnKind = if formal.typ.isVarargsUntyped: nkArgList else: nkBracket
var container = newNodeIT(cnKind, n.info, arrayConstr(c, n.info))
setSon(m.call, formal.position + 1,
implicitConv(nkHiddenStdConv, formal.typ, container, m, c))
else: