diff --git a/src/libexpr/eval-inline.hh b/src/libexpr/eval-inline.hh index d5ce238b2..631c0f396 100644 --- a/src/libexpr/eval-inline.hh +++ b/src/libexpr/eval-inline.hh @@ -87,11 +87,15 @@ void EvalState::forceValue(Value & v, const PosIdx pos) { if (v.isThunk()) { Env * env = v.payload.thunk.env; + assert(env || v.isBlackhole()); Expr * expr = v.payload.thunk.expr; try { v.mkBlackhole(); //checkInterrupt(); - expr->eval(*this, *env, v); + if (env) [[likely]] + expr->eval(*this, *env, v); + else + ExprBlackHole::throwInfiniteRecursionError(*this, v); } catch (...) { v.mkThunk(env, expr); tryFixupBlackHolePos(v, pos); diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc index 2fe2d5249..05f58957e 100644 --- a/src/libexpr/eval.cc +++ b/src/libexpr/eval.cc @@ -2052,9 +2052,12 @@ void ExprPos::eval(EvalState & state, Env & env, Value & v) state.mkPos(v, pos); } - -void ExprBlackHole::eval(EvalState & state, Env & env, Value & v) +void ExprBlackHole::eval(EvalState & state, [[maybe_unused]] Env & env, Value & v) { + throwInfiniteRecursionError(state, v); +} + +[[gnu::noinline]] [[noreturn]] void ExprBlackHole::throwInfiniteRecursionError(EvalState & state, Value &v) { state.error("infinite recursion encountered") .atPos(v.determinePos(noPos)) .debugThrow(); diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh index 948839bd9..2950ff1fd 100644 --- a/src/libexpr/nixexpr.hh +++ b/src/libexpr/nixexpr.hh @@ -468,6 +468,7 @@ struct ExprBlackHole : Expr void show(const SymbolTable & symbols, std::ostream & str) const override {} void eval(EvalState & state, Env & env, Value & v) override; void bindVars(EvalState & es, const std::shared_ptr & env) override {} + [[noreturn]] static void throwInfiniteRecursionError(EvalState & state, Value & v); }; extern ExprBlackHole eBlackHole;