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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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34
src/libexpr/flake/flake.cc
View file

@ -111,7 +111,7 @@ static FlakeInput parseFlakeInput(EvalState & state,
fetchers::Attrs attrs;
std::optional<std::string> url;
for (nix::Attr attr : *(value->attrs)) {
for (auto & attr : *value->attrs()) {
try {
if (attr.name == sUrl) {
expectType(state, nString, *attr.value, attr.pos);
@ -119,7 +119,7 @@ static FlakeInput parseFlakeInput(EvalState & state,
attrs.emplace("url", *url);
} else if (attr.name == sFlake) {
expectType(state, nBool, *attr.value, attr.pos);
input.isFlake = attr.value->boolean;
input.isFlake = attr.value->boolean();
} else if (attr.name == sInputs) {
input.overrides = parseFlakeInputs(state, attr.value, attr.pos, baseDir, lockRootPath);
} else if (attr.name == sFollows) {
@ -136,10 +136,10 @@ static FlakeInput parseFlakeInput(EvalState & state,
attrs.emplace(state.symbols[attr.name], attr.value->c_str());
break;
case nBool:
attrs.emplace(state.symbols[attr.name], Explicit<bool> { attr.value->boolean });
attrs.emplace(state.symbols[attr.name], Explicit<bool> { attr.value->boolean() });
break;
case nInt:
attrs.emplace(state.symbols[attr.name], (long unsigned int) attr.value->integer);
attrs.emplace(state.symbols[attr.name], (long unsigned int) attr.value->integer());
break;
default:
if (attr.name == state.symbols.create("publicKeys")) {
@ -189,7 +189,7 @@ static std::map<FlakeId, FlakeInput> parseFlakeInputs(
expectType(state, nAttrs, *value, pos);
for (nix::Attr & inputAttr : *(*value).attrs) {
for (auto & inputAttr : *value->attrs()) {
inputs.emplace(state.symbols[inputAttr.name],
parseFlakeInput(state,
state.symbols[inputAttr.name],
@ -223,23 +223,23 @@ static Flake readFlake(
.path = flakePath,
};
if (auto description = vInfo.attrs->get(state.sDescription)) {
if (auto description = vInfo.attrs()->get(state.sDescription)) {
expectType(state, nString, *description->value, description->pos);
flake.description = description->value->c_str();
}
auto sInputs = state.symbols.create("inputs");
if (auto inputs = vInfo.attrs->get(sInputs))
if (auto inputs = vInfo.attrs()->get(sInputs))
flake.inputs = parseFlakeInputs(state, inputs->value, inputs->pos, flakePath.parent().path.abs(), lockRootPath); // FIXME
auto sOutputs = state.symbols.create("outputs");
if (auto outputs = vInfo.attrs->get(sOutputs)) {
if (auto outputs = vInfo.attrs()->get(sOutputs)) {
expectType(state, nFunction, *outputs->value, outputs->pos);
if (outputs->value->isLambda() && outputs->value->lambda.fun->hasFormals()) {
for (auto & formal : outputs->value->lambda.fun->formals->formals) {
if (outputs->value->isLambda() && outputs->value->payload.lambda.fun->hasFormals()) {
for (auto & formal : outputs->value->payload.lambda.fun->formals->formals) {
if (formal.name != state.sSelf)
flake.inputs.emplace(state.symbols[formal.name], FlakeInput {
.ref = parseFlakeRef(state.symbols[formal.name])
@ -252,10 +252,10 @@ static Flake readFlake(
auto sNixConfig = state.symbols.create("nixConfig");
if (auto nixConfig = vInfo.attrs->get(sNixConfig)) {
if (auto nixConfig = vInfo.attrs()->get(sNixConfig)) {
expectType(state, nAttrs, *nixConfig->value, nixConfig->pos);
for (auto & setting : *nixConfig->value->attrs) {
for (auto & setting : *nixConfig->value->attrs()) {
forceTrivialValue(state, *setting.value, setting.pos);
if (setting.value->type() == nString)
flake.config.settings.emplace(
@ -291,7 +291,7 @@ static Flake readFlake(
}
}
for (auto & attr : *vInfo.attrs) {
for (auto & attr : *vInfo.attrs()) {
if (attr.name != state.sDescription &&
attr.name != sInputs &&
attr.name != sOutputs &&
@ -879,17 +879,17 @@ static void prim_flakeRefToString(
state.forceAttrs(*args[0], noPos,
"while evaluating the argument passed to builtins.flakeRefToString");
fetchers::Attrs attrs;
for (const auto & attr : *args[0]->attrs) {
for (const auto & attr : *args[0]->attrs()) {
auto t = attr.value->type();
if (t == nInt) {
attrs.emplace(state.symbols[attr.name],
(uint64_t) attr.value->integer);
(uint64_t) attr.value->integer());
} else if (t == nBool) {
attrs.emplace(state.symbols[attr.name],
Explicit<bool> { attr.value->boolean });
Explicit<bool> { attr.value->boolean() });
} else if (t == nString) {
attrs.emplace(state.symbols[attr.name],
std::string(attr.value->string_view()));
std::string(attr.value->string_view()));
} else {
state.error<EvalError>(
"flake reference attribute sets may only contain integers, Booleans, "