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Only check the assignment found at last

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If there are more than one such assignment, the last one may be
the one supplied to `clone` method.
Makes `find_stmt_assigns_to` internally reverses the iterator to make
the intent to "iterate statements backward" clear.
This commit is contained in:
Shotaro Yamada 2018-12-10 15:59:21 +09:00
parent fd9f5df36c
commit e7d18084fb
1 changed files with 21 additions and 15 deletions
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36
clippy_lints/src/redundant_clone.rs
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@ -132,7 +132,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for RedundantClone {
mir,
arg,
from_borrow,
bbdata.statements.iter().rev()
bbdata.statements.iter()
));
if from_borrow && cannot_move_out {
@ -166,7 +166,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for RedundantClone {
mir,
pred_arg,
true,
mir[ps[0]].statements.iter().rev()
mir[ps[0]].statements.iter()
));
if cannot_move_out {
continue;
@ -257,23 +257,29 @@ fn find_stmt_assigns_to<'a, 'tcx: 'a>(
mir: &mir::Mir<'tcx>,
to: mir::Local,
by_ref: bool,
mut stmts: impl Iterator<Item = &'a mir::Statement<'tcx>>,
stmts: impl DoubleEndedIterator<Item = &'a mir::Statement<'tcx>>,
) -> Option<(mir::Local, CannotMoveOut)> {
stmts.find_map(|stmt| {
if let mir::StatementKind::Assign(mir::Place::Local(local), v) = &stmt.kind {
if *local == to {
if by_ref {
if let mir::Rvalue::Ref(_, _, ref place) = **v {
return base_local_and_movability(cx, mir, place);
}
} else if let mir::Rvalue::Use(mir::Operand::Copy(ref place)) = **v {
return base_local_and_movability(cx, mir, place);
stmts
.rev()
.find_map(|stmt| {
if let mir::StatementKind::Assign(mir::Place::Local(local), v) = &stmt.kind {
if *local == to {
return Some(v);
}
}
}
None
})
None
})
.and_then(|v| {
if by_ref {
if let mir::Rvalue::Ref(_, _, ref place) = **v {
return base_local_and_movability(cx, mir, place);
}
} else if let mir::Rvalue::Use(mir::Operand::Copy(ref place)) = **v {
return base_local_and_movability(cx, mir, place);
}
None
})
}
/// Extracts and returns the undermost base `Local` of given `place`. Returns `place` itself