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Optimize small lists

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The value pointers of lists with 1 or 2 elements are now stored in the
list value itself. In particular, this makes the "concatMap (x: if
cond then [(f x)] else [])" idiom cheaper.
This commit is contained in:
Eelco Dolstra 2015-07-23 22:05:09 +02:00
parent 14be783676
commit b83801f8b3
11 changed files with 157 additions and 121 deletions
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18
src/libexpr/get-drvs.cc
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@ -39,9 +39,9 @@ DrvInfo::Outputs DrvInfo::queryOutputs()
state->forceList(*i->value, *i->pos);
/* For each output... */
for (unsigned int j = 0; j < i->value->list.length; ++j) {
for (unsigned int j = 0; j < i->value->listSize(); ++j) {
/* Evaluate the corresponding set. */
string name = state->forceStringNoCtx(*i->value->list.elems[j], *i->pos);
string name = state->forceStringNoCtx(*i->value->listElems()[j], *i->pos);
Bindings::iterator out = attrs->find(state->symbols.create(name));
if (out == attrs->end()) continue; // FIXME: throw error?
state->forceAttrs(*out->value);
@ -94,9 +94,9 @@ StringSet DrvInfo::queryMetaNames()
bool DrvInfo::checkMeta(Value & v)
{
state->forceValue(v);
if (v.type == tList) {
for (unsigned int n = 0; n < v.list.length; ++n)
if (!checkMeta(*v.list.elems[n])) return false;
if (v.isList()) {
for (unsigned int n = 0; n < v.listSize(); ++n)
if (!checkMeta(*v.listElems()[n])) return false;
return true;
}
else if (v.type == tAttrs) {
@ -277,13 +277,13 @@ static void getDerivations(EvalState & state, Value & vIn,
}
}
else if (v.type == tList) {
for (unsigned int n = 0; n < v.list.length; ++n) {
else if (v.isList()) {
for (unsigned int n = 0; n < v.listSize(); ++n) {
startNest(nest, lvlDebug,
format("evaluating list element"));
string pathPrefix2 = addToPath(pathPrefix, (format("%1%") % n).str());
if (getDerivation(state, *v.list.elems[n], pathPrefix2, drvs, done, ignoreAssertionFailures))
getDerivations(state, *v.list.elems[n], pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
if (getDerivation(state, *v.listElems()[n], pathPrefix2, drvs, done, ignoreAssertionFailures))
getDerivations(state, *v.listElems()[n], pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
}
}