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libexpr: ExprAttrs::attrs and ExprAttrs::dynamicAttrs -> std::optional

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without this, there is no way to swap them out for structures using a
different allocator. This should be reverted as part of redesiging
ExprAttrs to use an ExprAttrsBuilder
This commit is contained in:
Taeer Bar-Yam 2025-11-17 22:00:13 +01:00
parent 614e143a20
commit 4b97f1130a
5 changed files with 61 additions and 50 deletions
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24
src/libexpr/eval.cc
View file

@ -205,7 +205,7 @@ bool Value::isTrivial() const
{
return !isa<tApp, tPrimOpApp>()
&& (!isa<tThunk>()
|| (dynamic_cast<ExprAttrs *>(thunk().expr) && ((ExprAttrs *) thunk().expr)->dynamicAttrs.empty())
|| (dynamic_cast<ExprAttrs *>(thunk().expr) && ((ExprAttrs *) thunk().expr)->dynamicAttrs->empty())
|| dynamic_cast<ExprLambda *>(thunk().expr) || dynamic_cast<ExprList *>(thunk().expr));
}
@ -1226,26 +1226,26 @@ Env * ExprAttrs::buildInheritFromEnv(EvalState & state, Env & up)
void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
{
auto bindings = state.buildBindings(attrs.size() + dynamicAttrs.size());
auto bindings = state.buildBindings(attrs->size() + dynamicAttrs->size());
auto dynamicEnv = &env;
bool sort = false;
if (recursive) {
/* Create a new environment that contains the attributes in
this `rec'. */
Env & env2(state.mem.allocEnv(attrs.size()));
Env & env2(state.mem.allocEnv(attrs->size()));
env2.up = &env;
dynamicEnv = &env2;
Env * inheritEnv = inheritFromExprs ? buildInheritFromEnv(state, env2) : nullptr;
AttrDefs::iterator overrides = attrs.find(state.s.overrides);
bool hasOverrides = overrides != attrs.end();
AttrDefs::iterator overrides = attrs->find(state.s.overrides);
bool hasOverrides = overrides != attrs->end();
/* The recursive attributes are evaluated in the new
environment, while the inherited attributes are evaluated
in the original environment. */
Displacement displ = 0;
for (auto & i : attrs) {
for (auto & i : *attrs) {
Value * vAttr;
if (hasOverrides && i.second.kind != AttrDef::Kind::Inherited) {
vAttr = state.allocValue();
@ -1272,8 +1272,8 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
"while evaluating the `__overrides` attribute");
bindings.grow(state.buildBindings(bindings.capacity() + vOverrides->attrs()->size()));
for (auto & i : *vOverrides->attrs()) {
AttrDefs::iterator j = attrs.find(i.name);
if (j != attrs.end()) {
AttrDefs::iterator j = attrs->find(i.name);
if (j != attrs->end()) {
(*bindings.bindings)[j->second.displ] = i;
env2.values[j->second.displ] = i.value;
} else
@ -1285,13 +1285,13 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
else {
Env * inheritEnv = inheritFromExprs ? buildInheritFromEnv(state, env) : nullptr;
for (auto & i : attrs)
for (auto & i : *attrs)
bindings.insert(
i.first, i.second.e->maybeThunk(state, *i.second.chooseByKind(&env, &env, inheritEnv)), i.second.pos);
}
/* Dynamic attrs apply *after* rec and __overrides. */
for (auto & i : dynamicAttrs) {
for (auto & i : *dynamicAttrs) {
Value nameVal;
i.nameExpr->eval(state, *dynamicEnv, nameVal);
state.forceValue(nameVal, i.pos);
@ -1325,7 +1325,7 @@ void ExprLet::eval(EvalState & state, Env & env, Value & v)
{
/* Create a new environment that contains the attributes in this
`let'. */
Env & env2(state.mem.allocEnv(attrs->attrs.size()));
Env & env2(state.mem.allocEnv(attrs->attrs->size()));
env2.up = &env;
Env * inheritEnv = attrs->inheritFromExprs ? attrs->buildInheritFromEnv(state, env2) : nullptr;
@ -1334,7 +1334,7 @@ void ExprLet::eval(EvalState & state, Env & env, Value & v)
while the inherited attributes are evaluated in the original
environment. */
Displacement displ = 0;
for (auto & i : attrs->attrs) {
for (auto & i : *attrs->attrs) {
env2.values[displ++] = i.second.e->maybeThunk(state, *i.second.chooseByKind(&env2, &env, inheritEnv));
}

19
src/libexpr/include/nix/expr/nixexpr.hh
View file

@ -396,7 +396,11 @@ struct ExprAttrs : Expr
};
typedef std::pmr::map<Symbol, AttrDef> AttrDefs;
AttrDefs attrs;
/**
* attrs will never be null. we use std::optional so that we can call emplace() to re-initialize the value with a
* new pmr::map using a different allocator (move assignment will copy into the old allocator)
*/
std::optional<AttrDefs> attrs;
std::unique_ptr<std::pmr::vector<Expr *>> inheritFromExprs;
struct DynamicAttrDef
@ -410,12 +414,19 @@ struct ExprAttrs : Expr
};
typedef std::pmr::vector<DynamicAttrDef> DynamicAttrDefs;
DynamicAttrDefs dynamicAttrs;
/**
* dynamicAttrs will never be null. See comment on AttrDefs above.
*/
std::optional<DynamicAttrDefs> dynamicAttrs;
ExprAttrs(const PosIdx & pos)
: recursive(false)
, pos(pos) {};
, pos(pos)
, attrs(AttrDefs{})
, dynamicAttrs(DynamicAttrDefs{}) {};
ExprAttrs()
: recursive(false) {};
: recursive(false)
, attrs(AttrDefs{})
, dynamicAttrs(DynamicAttrDefs{}) {};
PosIdx getPos() const override
{

30
src/libexpr/include/nix/expr/parser-state.hh
View file

@ -126,8 +126,8 @@ inline void ParserState::addAttr(
for (i = attrPath.begin(); i + 1 < attrPath.end(); i++) {
ExprAttrs * nested;
if (i->symbol) {
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
if (j != attrs->attrs.end()) {
ExprAttrs::AttrDefs::iterator j = attrs->attrs->find(i->symbol);
if (j != attrs->attrs->end()) {
nested = dynamic_cast<ExprAttrs *>(j->second.e);
if (!nested) {
attrPath.erase(i + 1, attrPath.end());
@ -135,11 +135,11 @@ inline void ParserState::addAttr(
}
} else {
nested = exprs.add<ExprAttrs>();
attrs->attrs[i->symbol] = ExprAttrs::AttrDef(nested, pos);
(*attrs->attrs)[i->symbol] = ExprAttrs::AttrDef(nested, pos);
}
} else {
nested = exprs.add<ExprAttrs>();
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, nested, pos));
attrs->dynamicAttrs->push_back(ExprAttrs::DynamicAttrDef(i->expr, nested, pos));
}
attrs = nested;
}
@ -148,7 +148,7 @@ inline void ParserState::addAttr(
if (i->symbol) {
addAttr(attrs, attrPath, i->symbol, ExprAttrs::AttrDef(e, pos));
} else {
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, e, pos));
attrs->dynamicAttrs->push_back(ExprAttrs::DynamicAttrDef(i->expr, e, pos));
}
auto it = lexerState.positionToDocComment.find(pos);
@ -165,8 +165,8 @@ inline void ParserState::addAttr(
inline void
ParserState::addAttr(ExprAttrs * attrs, AttrPath & attrPath, const Symbol & symbol, ExprAttrs::AttrDef && def)
{
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(symbol);
if (j != attrs->attrs.end()) {
ExprAttrs::AttrDefs::iterator j = attrs->attrs->find(symbol);
if (j != attrs->attrs->end()) {
// This attr path is already defined. However, if both
// e and the expr pointed by the attr path are two attribute sets,
// we want to merge them.
@ -182,7 +182,7 @@ ParserState::addAttr(ExprAttrs * attrs, AttrPath & attrPath, const Symbol & symb
if (jAttrs && ae) {
if (ae->inheritFromExprs && !jAttrs->inheritFromExprs)
jAttrs->inheritFromExprs = std::make_unique<std::pmr::vector<Expr *>>();
for (auto & ad : ae->attrs) {
for (auto & ad : *ae->attrs) {
if (ad.second.kind == ExprAttrs::AttrDef::Kind::InheritedFrom) {
auto & sel = dynamic_cast<ExprSelect &>(*ad.second.e);
auto & from = dynamic_cast<ExprInheritFrom &>(*sel.e);
@ -192,12 +192,12 @@ ParserState::addAttr(ExprAttrs * attrs, AttrPath & attrPath, const Symbol & symb
addAttr(jAttrs, attrPath, ad.first, std::move(ad.second));
attrPath.pop_back();
}
ae->attrs.clear();
jAttrs->dynamicAttrs.insert(
jAttrs->dynamicAttrs.end(),
std::make_move_iterator(ae->dynamicAttrs.begin()),
std::make_move_iterator(ae->dynamicAttrs.end()));
ae->dynamicAttrs.clear();
ae->attrs->clear();
jAttrs->dynamicAttrs->insert(
jAttrs->dynamicAttrs->end(),
std::make_move_iterator(ae->dynamicAttrs->begin()),
std::make_move_iterator(ae->dynamicAttrs->end()));
ae->dynamicAttrs->clear();
if (ae->inheritFromExprs) {
jAttrs->inheritFromExprs->insert(
jAttrs->inheritFromExprs->end(),
@ -210,7 +210,7 @@ ParserState::addAttr(ExprAttrs * attrs, AttrPath & attrPath, const Symbol & symb
}
} else {
// This attr path is not defined. Let's create it.
attrs->attrs.emplace(symbol, def);
attrs->attrs->emplace(symbol, def);
def.e->setName(symbol);
}
}

24
src/libexpr/nixexpr.cc
View file

@ -74,9 +74,9 @@ void ExprOpHasAttr::show(const SymbolTable & symbols, std::ostream & str) const
void ExprAttrs::showBindings(const SymbolTable & symbols, std::ostream & str) const
{
typedef const decltype(attrs)::value_type * Attr;
typedef const AttrDefs::value_type * Attr;
std::vector<Attr> sorted;
for (auto & i : attrs)
for (auto & i : *attrs)
sorted.push_back(&i);
std::sort(sorted.begin(), sorted.end(), [&](Attr a, Attr b) {
std::string_view sa = symbols[a->first], sb = symbols[b->first];
@ -122,7 +122,7 @@ void ExprAttrs::showBindings(const SymbolTable & symbols, std::ostream & str) co
str << "; ";
}
}
for (auto & i : dynamicAttrs) {
for (auto & i : *dynamicAttrs) {
str << "\"${";
i.nameExpr->show(symbols, str);
str << "}\" = ";
@ -406,10 +406,10 @@ void ExprAttrs::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv>
if (recursive) {
auto newEnv = [&]() -> std::shared_ptr<const StaticEnv> {
auto newEnv = std::make_shared<StaticEnv>(nullptr, env, attrs.size());
auto newEnv = std::make_shared<StaticEnv>(nullptr, env, attrs->size());
Displacement displ = 0;
for (auto & i : attrs)
for (auto & i : *attrs)
newEnv->vars.emplace_back(i.first, i.second.displ = displ++);
return newEnv;
}();
@ -417,20 +417,20 @@ void ExprAttrs::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv>
// No need to sort newEnv since attrs is in sorted order.
auto inheritFromEnv = bindInheritSources(es, newEnv);
for (auto & i : attrs)
for (auto & i : *attrs)
i.second.e->bindVars(es, i.second.chooseByKind(newEnv, env, inheritFromEnv));
for (auto & i : dynamicAttrs) {
for (auto & i : *dynamicAttrs) {
i.nameExpr->bindVars(es, newEnv);
i.valueExpr->bindVars(es, newEnv);
}
} else {
auto inheritFromEnv = bindInheritSources(es, env);
for (auto & i : attrs)
for (auto & i : *attrs)
i.second.e->bindVars(es, i.second.chooseByKind(env, env, inheritFromEnv));
for (auto & i : dynamicAttrs) {
for (auto & i : *dynamicAttrs) {
i.nameExpr->bindVars(es, env);
i.valueExpr->bindVars(es, env);
}
@ -486,10 +486,10 @@ void ExprCall::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> &
void ExprLet::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env)
{
auto newEnv = [&]() -> std::shared_ptr<const StaticEnv> {
auto newEnv = std::make_shared<StaticEnv>(nullptr, env, attrs->attrs.size());
auto newEnv = std::make_shared<StaticEnv>(nullptr, env, attrs->attrs->size());
Displacement displ = 0;
for (auto & i : attrs->attrs)
for (auto & i : *attrs->attrs)
newEnv->vars.emplace_back(i.first, i.second.displ = displ++);
return newEnv;
}();
@ -497,7 +497,7 @@ void ExprLet::bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> &
// No need to sort newEnv since attrs->attrs is in sorted order.
auto inheritFromEnv = attrs->bindInheritSources(es, newEnv);
for (auto & i : attrs->attrs)
for (auto & i : *attrs->attrs)
i.second.e->bindVars(es, i.second.chooseByKind(newEnv, env, inheritFromEnv));
if (es.debugRepl)

14
src/libexpr/parser.y
View file

@ -211,7 +211,7 @@ expr_function
| WITH expr ';' expr_function
{ $$ = state->exprs.add<ExprWith>(CUR_POS, $2, $4); }
| LET binds IN_KW expr_function
{ if (!$2->dynamicAttrs.empty())
{ if (!$2->dynamicAttrs->empty())
throw ParseError({
.msg = HintFmt("dynamic attributes not allowed in let"),
.pos = state->positions[CUR_POS]
@ -413,9 +413,9 @@ binds1
| binds[accum] INHERIT attrs ';'
{ $$ = $accum;
for (auto & [i, iPos] : $attrs) {
if ($accum->attrs.find(i.symbol) != $accum->attrs.end())
state->dupAttr(i.symbol, iPos, $accum->attrs[i.symbol].pos);
$accum->attrs.emplace(
if ($accum->attrs->find(i.symbol) != $accum->attrs->end())
state->dupAttr(i.symbol, iPos, (*$accum->attrs)[i.symbol].pos);
$accum->attrs->emplace(
i.symbol,
ExprAttrs::AttrDef(state->exprs.add<ExprVar>(iPos, i.symbol), iPos, ExprAttrs::AttrDef::Kind::Inherited));
}
@ -427,9 +427,9 @@ binds1
$accum->inheritFromExprs->push_back($expr);
auto from = state->exprs.add<ExprInheritFrom>(state->at(@expr), $accum->inheritFromExprs->size() - 1);
for (auto & [i, iPos] : $attrs) {
if ($accum->attrs.find(i.symbol) != $accum->attrs.end())
state->dupAttr(i.symbol, iPos, $accum->attrs[i.symbol].pos);
$accum->attrs.emplace(
if ($accum->attrs->find(i.symbol) != $accum->attrs->end())
state->dupAttr(i.symbol, iPos, (*$accum->attrs)[i.symbol].pos);
$accum->attrs->emplace(
i.symbol,
ExprAttrs::AttrDef(
state->exprs.add<ExprSelect>(state->exprs.alloc, iPos, from, i.symbol),