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feat(3p/nix): Statically pass bindings capacity where possible

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To aid in making the decision of where to (currently just statically)
use a vector or btree as the backing implementation, add an extra
constructor argument to Bindings::NewGC for a capacity, and use
a (currently hardcoded at 32, for no good reason other than it felt like
a reasonable number) pivot to switch between our possible backing
implementations. Then, update all the call sites where it feels
reasonable that we know the capacity statically to *pass* that capacity
to the constructor.

Paired-With: Luke Granger-Brown <git@lukegb.com>
Paired-With: Vincent Ambo <mail@tazj.in>
Paired-With: Perry Lorier <isomer@tvl.fyi>
Change-Id: I1858c161301a1cd0e83aeeb9a58839378869e71d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1124
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: isomer <isomer@tvl.fyi>
This commit is contained in:
Griffin Smith 2020-07-12 17:29:45 -04:00 • committed by glittershark
parent d5505fcff9
commit d5597b4784
5 changed files with 39 additions and 31 deletions
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2
third_party/nix/src/libexpr/get-drvs.cc vendored
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@ -294,7 +294,7 @@ bool DrvInfo::queryMetaBool(const std::string& name, bool def) {
void DrvInfo::setMeta(const std::string& name, Value* v) {
getMeta();
Bindings* old = meta;
meta = Bindings::NewGC();
meta = Bindings::NewGC(old->size());
Symbol sym = state->symbols.Create(name);
if (old != nullptr) {
for (auto i : *old) {