forked from lix-project/lix
Merge pull request #5835 from yorickvP/fast-repl-load
Fix accidental O(n^2 * log n) performance in NixRepl::addAttrsToScope
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commit
0e90b13ab1
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@ -368,6 +368,13 @@ struct StaticEnv
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[](const Vars::value_type & a, const Vars::value_type & b) { return a.first < b.first; });
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}
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void deduplicate()
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{
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const auto last = std::unique(vars.begin(), vars.end(),
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[] (const Vars::value_type & a, const Vars::value_type & b) { return a.first == b.first; });
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vars.erase(last, vars.end());
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}
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Vars::const_iterator find(const Symbol & name) const
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{
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Vars::value_type key(name, 0);
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@ -661,8 +661,16 @@ void NixRepl::reloadFiles()
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void NixRepl::addAttrsToScope(Value & attrs)
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{
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state->forceAttrs(attrs);
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for (auto & i : *attrs.attrs)
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addVarToScope(i.name, *i.value);
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if (displ + attrs.attrs->size() >= envSize)
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throw Error("environment full; cannot add more variables");
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for (auto & i : *attrs.attrs) {
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staticEnv.vars.emplace_back(i.name, displ);
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env->values[displ++] = i.value;
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varNames.insert((string) i.name);
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}
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staticEnv.sort();
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staticEnv.deduplicate();
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notice("Added %1% variables.", attrs.attrs->size());
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}
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