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Move empty attrset optimisation
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ca5baf2392
commit
17daec0b83
3 changed files with 5 additions and 8 deletions
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@ -12,6 +12,8 @@ namespace nix {
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structure. */
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Bindings * EvalState::allocBindings(size_t capacity)
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{
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if (capacity == 0)
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return &emptyBindings;
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if (capacity > std::numeric_limits<Bindings::size_t>::max())
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throw Error("attribute set of size %d is too big", capacity);
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return new (allocBytes(sizeof(Bindings) + sizeof(Attr) * capacity)) Bindings((Bindings::size_t) capacity);
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@ -20,10 +22,6 @@ Bindings * EvalState::allocBindings(size_t capacity)
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void EvalState::mkAttrs(Value & v, size_t capacity)
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{
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if (capacity == 0) {
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v = vEmptySet;
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return;
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}
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v.mkAttrs(allocBindings(capacity));
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nrAttrsets++;
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nrAttrsInAttrsets += capacity;
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@ -63,7 +61,7 @@ Value & BindingsBuilder::alloc(std::string_view name, ptr<Pos> pos)
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void Bindings::sort()
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{
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std::sort(begin(), end());
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if (size_) std::sort(begin(), end());
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}
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@ -413,6 +413,7 @@ EvalState::EvalState(
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, sSelf(symbols.create("self"))
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, sEpsilon(symbols.create(""))
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, repair(NoRepair)
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, emptyBindings(0)
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, store(store)
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, buildStore(buildStore ? buildStore : store)
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, regexCache(makeRegexCache())
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@ -454,8 +455,6 @@ EvalState::EvalState(
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}
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}
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vEmptySet.mkAttrs(allocBindings(0));
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createBaseEnv();
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}
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@ -91,7 +91,7 @@ public:
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mode. */
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std::optional<PathSet> allowedPaths;
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Value vEmptySet;
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Bindings emptyBindings;
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/* Store used to materialise .drv files. */
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const ref<Store> store;
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