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libexpr: Document {eval,maybeThunk} methods

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Robert Hensing 2024-08-13 21:09:11 +02:00 • committed by Sergei Zimmerman
parent ab7feb3898
commit 71b27774f0
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2 changed files with 9 additions and 4 deletions
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4
src/libexpr/eval.cc
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@ -979,10 +979,6 @@ void EvalState::mkSingleDerivedPathString(const SingleDerivedPath & p, Value & v
}); });
} }
/* Create a thunk for the delayed computation of the given expression
in the given environment. But if the expression is a variable,
then look it up right away. This significantly reduces the number
of thunks allocated. */
Value * Expr::maybeThunk(EvalState & state, Env & env) Value * Expr::maybeThunk(EvalState & state, Env & env)
{ {
Value * v = state.allocValue(); Value * v = state.allocValue();

9
src/libexpr/include/nix/expr/nixexpr.hh
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@ -99,7 +99,16 @@ struct Expr
virtual ~Expr() {}; virtual ~Expr() {};
virtual void show(const SymbolTable & symbols, std::ostream & str) const; virtual void show(const SymbolTable & symbols, std::ostream & str) const;
virtual void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env); virtual void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env);
/** Normal evaluation, implemented directly by all subclasses. */
virtual void eval(EvalState & state, Env & env, Value & v); virtual void eval(EvalState & state, Env & env, Value & v);
/**
* Create a thunk for the delayed computation of the given expression
* in the given environment. But if the expression is a variable,
* then look it up right away. This significantly reduces the number
* of thunks allocated.
*/
virtual Value * maybeThunk(EvalState & state, Env & env); virtual Value * maybeThunk(EvalState & state, Env & env);
virtual void setName(Symbol name); virtual void setName(Symbol name);
virtual void setDocComment(DocComment docComment) {}; virtual void setDocComment(DocComment docComment) {};