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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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2
src/libexpr/primops/fetchMercurial.cc
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@ -84,7 +84,7 @@ static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value ** ar
auto [storePath, input2] = input.fetchToStore(state.store);
auto attrs2 = state.buildBindings(8);
state.mkStorePathString(storePath, attrs2.alloc(state.sOutPath));
state.mkStorePathString(storePath, attrs2.alloc(state.s.outPath));
if (input2.getRef())
attrs2.alloc("branch").mkString(*input2.getRef());
// Backward compatibility: set 'rev' to