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prim_mapAttrs: `f' must be evaluated lazily to avoid infinite recursion

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This commit is contained in:
volth 2018-07-06 21:49:51 +00:00
parent aa64e95bc8
commit 627e28ba33
2 changed files with 3 additions and 6 deletions
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6
src/libexpr/eval.cc
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@ -1076,6 +1076,8 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
{
forceValue(fun, pos);
if (fun.type == tPrimOp || fun.type == tPrimOpApp) {
callPrimOp(fun, arg, v, pos);
return;
@ -1091,10 +1093,8 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & po
auto & fun2 = *allocValue();
fun2 = fun;
/* !!! Should we use the attr pos here? */
forceValue(*found->value, pos);
Value v2;
callFunction(*found->value, fun2, v2, pos);
forceValue(v2, pos);
return callFunction(v2, arg, v, pos);
}
}
@ -1181,7 +1181,6 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
if (fun.type == tAttrs) {
auto found = fun.attrs->find(sFunctor);
if (found != fun.attrs->end()) {
forceValue(*found->value);
Value * v = allocValue();
callFunction(*found->value, fun, *v, noPos);
forceValue(*v);
@ -1565,7 +1564,6 @@ string EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
if (v.type == tAttrs) {
auto i = v.attrs->find(sToString);
if (i != v.attrs->end()) {
forceValue(*i->value, pos);
Value v1;
callFunction(*i->value, v, v1, pos);
return coerceToString(pos, v1, context, coerceMore, copyToStore);

3
src/libexpr/primops.cc
View file

@ -1359,7 +1359,6 @@ static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args
/* Apply a function to every element of an attribute set. */
static void prim_mapAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
state.forceFunction(*args[0], pos);
state.forceAttrs(*args[1], pos);
state.mkAttrs(v, args[1]->attrs->size());
@ -1368,7 +1367,7 @@ static void prim_mapAttrs(EvalState & state, const Pos & pos, Value * * args, Va
Value * vName = state.allocValue();
Value * vFun2 = state.allocValue();
mkString(*vName, i.name);
state.callFunction(*args[0], *vName, *vFun2, pos);
mkApp(*vFun2, *args[0], *vName);
mkApp(*state.allocAttr(v, i.name), *vFun2, *i.value);
}
}