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Make constant primops lazy

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This commit is contained in:
Eelco Dolstra 2018-11-29 16:28:43 +01:00
parent 01d07b1e92
commit aa0e2a2e70
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GPG key ID: 8170B4726D7198DE
1 changed files with 10 additions and 3 deletions
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13
src/libexpr/eval.cc
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@ -439,14 +439,21 @@ Value * EvalState::addConstant(const string & name, Value & v)
Value * EvalState::addPrimOp(const string & name,
size_t arity, PrimOpFun primOp)
{
auto name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
Symbol sym = symbols.create(name2);
/* Hack to make constants lazy: turn them into a application of
the primop to a dummy value. */
if (arity == 0) {
auto vPrimOp = allocValue();
vPrimOp->type = tPrimOp;
vPrimOp->primOp = new PrimOp(primOp, 1, sym);
Value v;
primOp(*this, noPos, nullptr, v);
mkApp(v, *vPrimOp, *vPrimOp);
return addConstant(name, v);
}
Value * v = allocValue();
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
Symbol sym = symbols.create(name2);
v->type = tPrimOp;
v->primOp = new PrimOp(primOp, arity, sym);
staticBaseEnv.vars[symbols.create(name)] = baseEnvDispl;