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don't clone a BacktrackFrame if we are not going to backtrack #5132

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merged 1 commit into from
Mar 6, 2018
Merged

don't clone a BacktrackFrame if we are not going to backtrack #5132

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32 changes: 19 additions & 13 deletions src/cargo/core/resolver/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -892,15 +892,19 @@ fn activate_deps_loop(
// We have a candidate. Clone a `BacktrackFrame`
// so we can add it to the `backtrack_stack` if activation succeeds.
// We clone now in case `activate` changes `cx` and then fails.
let backtrack = BacktrackFrame {
cur,
context_backup: Context::clone(&cx),
deps_backup: <BinaryHeap<DepsFrame>>::clone(&remaining_deps),
remaining_candidates: remaining_candidates.clone(),
parent: Summary::clone(&parent),
dep: Dependency::clone(&dep),
features: Rc::clone(&features),
conflicting_activations: conflicting_activations.clone(),
let backtrack = if has_another {
Some(BacktrackFrame {
cur,
context_backup: Context::clone(&cx),
deps_backup: <BinaryHeap<DepsFrame>>::clone(&remaining_deps),
remaining_candidates: remaining_candidates.clone(),
parent: Summary::clone(&parent),
dep: Dependency::clone(&dep),
features: Rc::clone(&features),
conflicting_activations: conflicting_activations.clone(),
})
} else {
None
};

let method = Method::Required {
Expand All @@ -925,12 +929,14 @@ fn activate_deps_loop(
// Add an entry to the `backtrack_stack` so
// we can try the next one if this one fails.
if successfully_activated {
if has_another {
backtrack_stack.push(backtrack);
if let Some(b) = backtrack {
backtrack_stack.push(b);
}
} else {
// `activate` changed `cx` and then failed so put things back.
cx = backtrack.context_backup;
if let Some(b) = backtrack {
// `activate` changed `cx` and then failed so put things back.
cx = b.context_backup;
} // else we are just using the cx for the error message so we can live with a corrupted one
}
}
}
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