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Never update values after setting the type

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Thunks are now overwritten by a helper function
`Value::finishValue(newType, payload)` (where `payload` is the
original anonymous union inside `Value`). This helps to ensure we
never update a value elsewhere, since that would be incompatible with
parallel evaluation (i.e. after a value has transitioned from being a
thunk to being a non-thunk, it should be immutable).

There were two places where this happened: `Value::mkString()` and
`ExprAttrs::eval()`.

This PR also adds a bunch of accessor functions for value contents,
like `Value::integer()` to access the integer field in the union.
This commit is contained in:
Eelco Dolstra 2024-03-25 18:20:18 +01:00
parent 6d90287f5a
commit 8c0590fa32
35 changed files with 530 additions and 556 deletions
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28
src/libexpr/value-to-json.cc
View file

@ -22,11 +22,11 @@ json printValueAsJSON(EvalState & state, bool strict,
switch (v.type()) {
case nInt:
out = v.integer;
out = v.integer();
break;
case nBool:
out = v.boolean;
out = v.boolean();
break;
case nString:
@ -52,24 +52,20 @@ json printValueAsJSON(EvalState & state, bool strict,
out = *maybeString;
break;
}
auto i = v.attrs->find(state.sOutPath);
if (i == v.attrs->end()) {
if (auto i = v.attrs()->get(state.sOutPath))
return printValueAsJSON(state, strict, *i->value, i->pos, context, copyToStore);
else {
out = json::object();
StringSet names;
for (auto & j : *v.attrs)
names.emplace(state.symbols[j.name]);
for (auto & j : names) {
Attr & a(*v.attrs->find(state.symbols.create(j)));
for (auto & a : v.attrs()->lexicographicOrder(state.symbols)) {
try {
out[j] = printValueAsJSON(state, strict, *a.value, a.pos, context, copyToStore);
out[state.symbols[a->name]] = printValueAsJSON(state, strict, *a->value, a->pos, context, copyToStore);
} catch (Error & e) {
e.addTrace(state.positions[a.pos],
HintFmt("while evaluating attribute '%1%'", j));
e.addTrace(state.positions[a->pos],
HintFmt("while evaluating attribute '%1%'", state.symbols[a->name]));
throw;
}
}
} else
return printValueAsJSON(state, strict, *i->value, i->pos, context, copyToStore);
}
break;
}
@ -90,11 +86,11 @@ json printValueAsJSON(EvalState & state, bool strict,
}
case nExternal:
return v.external->printValueAsJSON(state, strict, context, copyToStore);
return v.external()->printValueAsJSON(state, strict, context, copyToStore);
break;
case nFloat:
out = v.fpoint;
out = v.fpoint();
break;
case nThunk: