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Don't allocate empty lists

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This saves about 4 MB when evaluating a NixOS system configuration.
This commit is contained in:
Eelco Dolstra 2012-08-13 15:02:09 -04:00
parent 3e89ef597c
commit e5c589d271
1 changed files with 1 additions and 1 deletions
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2
src/libexpr/eval.cc
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@ -348,7 +348,7 @@ void EvalState::mkList(Value & v, unsigned int length)
{
v.type = tList;
v.list.length = length;
v.list.elems = (Value * *) GC_MALLOC(length * sizeof(Value *));
v.list.elems = length ? (Value * *) GC_MALLOC(length * sizeof(Value *)) : 0;
nrListElems += length;
}