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Get rid of some unnecessary ExprConcatStrings nodes in dynamic attrs

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This gives a ~18% speedup in NixOS evaluation (after converting
most calls to hasAttr/getAttr to dynamic attrs).
This commit is contained in:
Eelco Dolstra 2014-10-05 01:04:58 +02:00
parent 1418806969
commit b6809608cc
3 changed files with 18 additions and 25 deletions
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9
src/libexpr/eval.cc
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@ -701,13 +701,10 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
/* Dynamic attrs apply *after* rec and __overrides. */
foreach (DynamicAttrDefs::iterator, i, dynamicAttrs) {
Value nameVal;
if (i->nameExpr->es->size() == 1) {
i->nameExpr->es->front()->eval(state, *dynamicEnv, nameVal);
state.forceValue(nameVal);
if (nameVal.type == tNull)
continue;
}
i->nameExpr->eval(state, *dynamicEnv, nameVal);
state.forceValue(nameVal);
if (nameVal.type == tNull)
continue;
state.forceStringNoCtx(nameVal);
Symbol nameSym = state.symbols.create(nameVal.string.s);
Bindings::iterator j = v.attrs->find(nameSym);