bjoernager/rust
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create a drop ladder for an array if any value is moved out

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This commit is contained in:
Mikhail Modin 2017-11-28 15:48:23 +03:00
parent 8bcbf91a86
commit 7be2fd853a
5 changed files with 87 additions and 9 deletions
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14
src/librustc_mir/transform/elaborate_drops.rs
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@ -257,6 +257,20 @@ impl<'a, 'b, 'tcx> DropElaborator<'a, 'tcx> for Elaborator<'a, 'b, 'tcx> {
})
}
fn array_subpath(&self, path: Self::Path, index: u32, size: u32) -> Option<Self::Path> {
dataflow::move_path_children_matching(self.ctxt.move_data(), path, |p| {
match p {
&Projection {
elem: ProjectionElem::ConstantIndex{offset, min_length: _, from_end: false}, ..
} => offset == index,
&Projection {
elem: ProjectionElem::ConstantIndex{offset, min_length: _, from_end: true}, ..
} => size - offset == index,
_ => false
}
})
}
fn deref_subpath(&self, path: Self::Path) -> Option<Self::Path> {
dataflow::move_path_children_matching(self.ctxt.move_data(), path, |p| {
match p {