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Don't hang when calling an attrset

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Fixes #5565.
This commit is contained in:
Eelco Dolstra 2021-11-16 17:44:19 +01:00
parent 8c93a481af
commit e41cf8511f
1 changed files with 10 additions and 10 deletions
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10
src/libexpr/eval.cc
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@ -1275,6 +1275,8 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
} }
}; };
Attr * functor;
while (nrArgs > 0) { while (nrArgs > 0) {
if (vCur.isLambda()) { if (vCur.isLambda()) {
@ -1403,17 +1405,15 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
} }
} }
else if (vCur.type() == nAttrs) { else if (vCur.type() == nAttrs && (functor = vCur.attrs->get(sFunctor))) {
if (auto functor = vCur.attrs->get(sFunctor)) {
/* 'vCur" may be allocated on the stack of the calling /* 'vCur" may be allocated on the stack of the calling
function, but for functors we may keep a reference, function, but for functors we may keep a reference, so
so heap-allocate a copy and use that instead. */ heap-allocate a copy and use that instead. */
Value * args2[] = {allocValue()}; Value * args2[] = {allocValue()};
*args2[0] = vCur; *args2[0] = vCur;
/* !!! Should we use the attr pos here? */ /* !!! Should we use the attr pos here? */
callFunction(*functor->value, 1, args2, vCur, pos); callFunction(*functor->value, 1, args2, vCur, pos);
} }
}
else else
throwTypeError(pos, "attempt to call something which is not a function but %1%", vCur); throwTypeError(pos, "attempt to call something which is not a function but %1%", vCur);