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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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4
src/libcmd/installables.cc
View file

@ -289,7 +289,7 @@ void SourceExprCommand::completeInstallable(AddCompletions & completions, std::s
state->autoCallFunction(*autoArgs, v1, v2);
if (v2.type() == nAttrs) {
for (auto & i : *v2.attrs) {
for (auto & i : *v2.attrs()) {
std::string name = state->symbols[i.name];
if (name.find(searchWord) == 0) {
if (prefix_ == "")
@ -461,7 +461,7 @@ ref<eval_cache::EvalCache> openEvalCache(
state.forceAttrs(*vFlake, noPos, "while parsing cached flake data");
auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs"));
auto aOutputs = vFlake->attrs()->get(state.symbols.create("outputs"));
assert(aOutputs);
return aOutputs->value;