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Write directly to the RETURN_PLACE in tuple_like_shim

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This commit is contained in:
Manish Goregaokar 2018-01-30 10:51:48 +05:30
parent e07aecde48
commit 7fd3c27345
1 changed files with 16 additions and 23 deletions
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39
src/librustc_mir/shim.rs
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@ -408,7 +408,7 @@ impl<'a, 'tcx> CloneShimBuilder<'a, 'tcx> {
rcvr_field: Place<'tcx>,
next: BasicBlock,
cleanup: BasicBlock,
place: Place<'tcx>
dest: Place<'tcx>
) {
let tcx = self.tcx;
@ -452,7 +452,7 @@ impl<'a, 'tcx> CloneShimBuilder<'a, 'tcx> {
self.block(vec![statement], TerminatorKind::Call {
func,
args: vec![Operand::Move(ref_loc)],
destination: Some((place, next)),
destination: Some((dest, next)),
cleanup: Some(cleanup),
}, false);
}
@ -633,12 +633,13 @@ impl<'a, 'tcx> CloneShimBuilder<'a, 'tcx> {
let rcvr = Place::Local(Local::new(1+0)).deref();
let mut returns = Vec::new();
let mut previous_place = None;
let return_place = Place::Local(RETURN_PLACE);
for (i, ity) in tys.iter().enumerate() {
let rcvr_field = rcvr.clone().field(Field::new(i), *ity);
let field = Field::new(i);
let rcvr_field = rcvr.clone().field(field, *ity);
let place = self.make_place(Mutability::Not, ity);
returns.push(place.clone());
let place = return_place.clone().field(field, *ity);
// BB #(2i)
// `returns[i] = Clone::clone(&rcvr.i);`
@ -648,34 +649,26 @@ impl<'a, 'tcx> CloneShimBuilder<'a, 'tcx> {
rcvr_field,
BasicBlock::new(2 * i + 2),
BasicBlock::new(2 * i + 1),
place
place.clone()
);
// BB #(2i + 1) (cleanup)
if i == 0 {
// Nothing to drop, just resume.
self.block(vec![], TerminatorKind::Resume, true);
} else {
if let Some(previous_place) = previous_place.take() {
// Drop previous field and goto previous cleanup block.
self.block(vec![], TerminatorKind::Drop {
location: returns[i - 1].clone(),
location: previous_place,
target: BasicBlock::new(2 * i - 1),
unwind: None,
}, true);
} else {
// Nothing to drop, just resume.
self.block(vec![], TerminatorKind::Resume, true);
}
previous_place = Some(place);
}
// `return kind(returns[0], returns[1], ..., returns[tys.len() - 1]);`
let ret_statement = self.make_statement(
StatementKind::Assign(
Place::Local(RETURN_PLACE),
Rvalue::Aggregate(
box kind,
returns.into_iter().map(Operand::Move).collect()
)
)
);
self.block(vec![ret_statement], TerminatorKind::Return, false);
self.block(vec![], TerminatorKind::Return, false);
}
}