* Cache parse trees to prevent repeated parsing of imported Nix
expressions.
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@ -272,7 +272,14 @@ void EvalState::cloneAttrs(Value & src, Value & dst)
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void EvalState::evalFile(const Path & path, Value & v)
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{
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startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
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Expr e = parseExprFromFile(*this, path);
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Expr e = parseTrees.get(toATerm(path));
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if (!e) {
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e = parseExprFromFile(*this, path);
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parseTrees.set(toATerm(path), e);
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}
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try {
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eval(e, v);
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} catch (Error & e) {
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@ -135,6 +135,8 @@ private:
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bool allowUnsafeEquality;
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ATermMap parseTrees;
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public:
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EvalState();
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@ -526,12 +526,6 @@ Expr parseExprFromFile(EvalState & state, Path path)
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{
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assert(path[0] == '/');
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#if 0
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/* Perhaps this is already an imploded parse tree? */
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Expr e = ATreadFromNamedFile(path.c_str());
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if (e) return e;
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#endif
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/* If `path' is a symlink, follow it. This is so that relative
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path references work. */
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struct stat st;
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