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authorEelco Dolstra <eelco.dolstra@logicblox.com>2015-07-23T21·11+0200
committerEelco Dolstra <eelco.dolstra@logicblox.com>2015-07-23T21·11+0200
commitc8bb2371ebf25ab78abde84e3c5742f9844a74b7 (patch)
tree53aeea8ded7f7b21636a87414f715f897962ffcd /src/libexpr/eval.cc
parent16c9935fa9487f504b1e9c7f14d0f85ac870a62c (diff)
Optimize empty sets
This reduces the number of Bindings allocations by about 10%.
Diffstat (limited to 'src/libexpr/eval.cc')
-rw-r--r--src/libexpr/eval.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 044256112d50..14169d85735e 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -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();
 }