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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/value-to-xml.cc
View file

@ -98,14 +98,14 @@ static void printValueAsXML(
XMLAttrs xmlAttrs;
Path drvPath;
if (auto a = v.attrs()->get(state.sDrvPath)) {
if (auto a = v.attrs()->get(state.s.drvPath)) {
if (strict)
state.forceValue(*a->value, a->pos);
if (a->value->type() == nString)
xmlAttrs["drvPath"] = drvPath = a->value->c_str();
}
if (auto a = v.attrs()->get(state.sOutPath)) {
if (auto a = v.attrs()->get(state.s.outPath)) {
if (strict)
state.forceValue(*a->value, a->pos);
if (a->value->type() == nString)