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libstore: keep Goal errors as unique_ptrs

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Error is pretty large, and most goals do not fail. this alone more than
halves the size of Goal on x86_64-linux, from 720 bytes down to 344. in
derived classes the difference is not as dramatic, but even the largest
derived class (`LocalDerivationGoal`) loses almost 20% of its footprint

Change-Id: Ifda8f94c81b6566eeb3e52d55d9796ec40c7bce8
This commit is contained in:
eldritch horrors 2024-07-20 21:05:19 +02:00
parent 7bf1aff44a
commit 472ff1b833
3 changed files with 3 additions and 3 deletions
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2
src/libstore/build/entry-points.cc
View file

@ -22,7 +22,7 @@ void Store::buildPaths(const std::vector<DerivedPath> & reqs, BuildMode buildMod
if (ex)
logError(i->ex->info());
else
ex = std::move(i->ex);
ex = std::move(*i->ex);
}
if (i->exitCode != Goal::ecSuccess) {
if (auto i2 = dynamic_cast<DerivationGoal *>(i.get()))

2
src/libstore/build/goal.cc
View file

@ -78,7 +78,7 @@ void Goal::amDone(ExitCode result, std::optional<Error> ex)
if (!waiters.empty())
logError(ex->info());
else
this->ex = std::move(*ex);
this->ex = std::make_unique<Error>(std::move(*ex));
}
for (auto & i : waiters) {

2
src/libstore/build/goal.hh
View file

@ -121,7 +121,7 @@ public:
/**
* Exception containing an error message, if any.
*/
std::optional<Error> ex;
std::unique_ptr<Error> ex;
Goal(Worker & worker, DerivedPath path)
: worker(worker)