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libexpr: Statically allocate commonly used symbols

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The motivation for this change is two-fold:

1. Commonly used Symbol values can be referred to
   quite often and they can be assigned at compile-time
   rather than runtime.

2. This also unclutters EvalState constructor, which was
   getting very long and unreadable.

Spiritually similar to https://gerrit.lix.systems/c/lix/+/2218,
though that patch doesn't allocate the Symbol at compile time.

Co-authored-by: eldritch horrors <pennae@lix.systems>
This commit is contained in:
Sergei Zimmerman 2025-08-31 12:56:02 +03:00 • committed by Jörg Thalheim
parent 2746985d90
commit 363620dd24
23 changed files with 313 additions and 255 deletions
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4
src/libexpr/eval-profiler.cc
View file

@ -185,7 +185,7 @@ FrameInfo SampleStack::getPrimOpFrameInfo(const PrimOp & primOp, std::span<Value
/* Error context strings don't actually matter, since we ignore all eval errors. */
state.forceAttrs(*args[0], pos, "");
auto attrs = args[0]->attrs();
auto nameAttr = state.getAttr(state.sName, attrs, "");
auto nameAttr = state.getAttr(state.s.name, attrs, "");
auto drvName = std::string(state.forceStringNoCtx(*nameAttr->value, pos, ""));
return DerivationStrictFrameInfo{.callPos = pos, .drvName = std::move(drvName)};
} catch (...) {
@ -211,7 +211,7 @@ FrameInfo SampleStack::getFrameInfoFromValueAndPos(const Value & v, std::span<Va
/* Resolve primOp eagerly. Must not hold on to a reference to a Value. */
return PrimOpFrameInfo{.expr = v.primOpAppPrimOp(), .callPos = pos};
else if (state.isFunctor(v)) {
const auto functor = v.attrs()->get(state.sFunctor);
const auto functor = v.attrs()->get(state.s.functor);
if (auto pos_ = posCache.lookup(pos); std::holds_alternative<std::monostate>(pos_.origin))
/* HACK: In case callsite position is unresolved. */
return FunctorFrameInfo{.pos = functor->pos};