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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
Download patch file Download diff file Expand all files Collapse all files

24
src/libexpr/primops/context.cc
View file

@ -258,7 +258,7 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
auto sPath = state.symbols.create("path");
auto sAllOutputs = state.symbols.create("allOutputs");
for (auto & i : *args[1]->attrs) {
for (auto & i : *args[1]->attrs()) {
const auto & name = state.symbols[i.name];
if (!state.store->isStorePath(name))
state.error<EvalError>(
@ -269,17 +269,16 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
if (!settings.readOnlyMode)
state.store->ensurePath(namePath);
state.forceAttrs(*i.value, i.pos, "while evaluating the value of a string context");
auto iter = i.value->attrs->find(sPath);
if (iter != i.value->attrs->end()) {
if (state.forceBool(*iter->value, iter->pos, "while evaluating the `path` attribute of a string context"))
if (auto attr = i.value->attrs()->get(sPath)) {
if (state.forceBool(*attr->value, attr->pos, "while evaluating the `path` attribute of a string context"))
context.emplace(NixStringContextElem::Opaque {
.path = namePath,
});
}
iter = i.value->attrs->find(sAllOutputs);
if (iter != i.value->attrs->end()) {
if (state.forceBool(*iter->value, iter->pos, "while evaluating the `allOutputs` attribute of a string context")) {
if (auto attr = i.value->attrs()->get(sAllOutputs)) {
if (state.forceBool(*attr->value, attr->pos, "while evaluating the `allOutputs` attribute of a string context")) {
if (!isDerivation(name)) {
state.error<EvalError>(
"tried to add all-outputs context of %s, which is not a derivation, to a string",
@ -292,17 +291,16 @@ static void prim_appendContext(EvalState & state, const PosIdx pos, Value * * ar
}
}
iter = i.value->attrs->find(state.sOutputs);
if (iter != i.value->attrs->end()) {
state.forceList(*iter->value, iter->pos, "while evaluating the `outputs` attribute of a string context");
if (iter->value->listSize() && !isDerivation(name)) {
if (auto attr = i.value->attrs()->get(state.sOutputs)) {
state.forceList(*attr->value, attr->pos, "while evaluating the `outputs` attribute of a string context");
if (attr->value->listSize() && !isDerivation(name)) {
state.error<EvalError>(
"tried to add derivation output context of %s, which is not a derivation, to a string",
name
).atPos(i.pos).debugThrow();
}
for (auto elem : iter->value->listItems()) {
auto outputName = state.forceStringNoCtx(*elem, iter->pos, "while evaluating an output name within a string context");
for (auto elem : attr->value->listItems()) {
auto outputName = state.forceStringNoCtx(*elem, attr->pos, "while evaluating an output name within a string context");
context.emplace(NixStringContextElem::Built {
.drvPath = makeConstantStorePathRef(namePath),
.output = std::string { outputName },

2
src/libexpr/primops/fetchClosure.cc
View file

@ -121,7 +121,7 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
std::optional<StorePathOrGap> toPath;
std::optional<bool> inputAddressedMaybe;
for (auto & attr : *args[0]->attrs) {
for (auto & attr : *args[0]->attrs()) {
const auto & attrName = state.symbols[attr.name];
auto attrHint = [&]() -> std::string {
return "while evaluating the '" + attrName + "' attribute passed to builtins.fetchClosure";

2
src/libexpr/primops/fetchMercurial.cc
View file

@ -20,7 +20,7 @@ static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value * * a
if (args[0]->type() == nAttrs) {
for (auto & attr : *args[0]->attrs) {
for (auto & attr : *args[0]->attrs()) {
std::string_view n(state.symbols[attr.name]);
if (n == "url")
url = state.coerceToString(attr.pos, *attr.value, context,

10
src/libexpr/primops/fetchTree.cc
View file

@ -97,7 +97,7 @@ static void fetchTree(
fetchers::Attrs attrs;
if (auto aType = args[0]->attrs->get(state.sType)) {
if (auto aType = args[0]->attrs()->get(state.sType)) {
if (type)
state.error<EvalError>(
"unexpected attribute 'type'"
@ -110,7 +110,7 @@ static void fetchTree(
attrs.emplace("type", type.value());
for (auto & attr : *args[0]->attrs) {
for (auto & attr : *args[0]->attrs()) {
if (attr.name == state.sType) continue;
state.forceValue(*attr.value, attr.pos);
if (attr.value->type() == nPath || attr.value->type() == nString) {
@ -121,9 +121,9 @@ static void fetchTree(
: s);
}
else if (attr.value->type() == nBool)
attrs.emplace(state.symbols[attr.name], Explicit<bool>{attr.value->boolean});
attrs.emplace(state.symbols[attr.name], Explicit<bool>{attr.value->boolean()});
else if (attr.value->type() == nInt)
attrs.emplace(state.symbols[attr.name], uint64_t(attr.value->integer));
attrs.emplace(state.symbols[attr.name], uint64_t(attr.value->integer()));
else if (state.symbols[attr.name] == "publicKeys") {
experimentalFeatureSettings.require(Xp::VerifiedFetches);
attrs.emplace(state.symbols[attr.name], printValueAsJSON(state, true, *attr.value, pos, context).dump());
@ -422,7 +422,7 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
if (args[0]->type() == nAttrs) {
for (auto & attr : *args[0]->attrs) {
for (auto & attr : *args[0]->attrs()) {
std::string_view n(state.symbols[attr.name]);
if (n == "url")
url = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the url we should fetch");