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Optimize empty sets

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This reduces the number of Bindings allocations by about 10%.
This commit is contained in:
Eelco Dolstra 2015-07-23 23:11:08 +02:00
parent 16c9935fa9
commit c8bb2371eb
3 changed files with 14 additions and 4 deletions
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4
src/libexpr/eval.cc
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@ -281,6 +281,10 @@ EvalState::EvalState(const Strings & _searchPath)
for (auto & i : paths) addToSearchPath(i);
addToSearchPath("nix=" + settings.nixDataDir + "/nix/corepkgs");
clearValue(vEmptySet);
vEmptySet.type = tAttrs;
vEmptySet.attrs = allocBindings(0);
createBaseEnv();
}