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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs')
-rw-r--r-- | compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs b/compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs new file mode 100644 index 000000000..28936274b --- /dev/null +++ b/compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs @@ -0,0 +1,61 @@ +//! The move-analysis portion of borrowck needs to work in an abstract +//! domain of lifted `Place`s. Most of the `Place` variants fall into a +//! one-to-one mapping between the concrete and abstract (e.g., a +//! field-deref on a local variable, `x.field`, has the same meaning +//! in both domains). Indexed projections are the exception: `a[x]` +//! needs to be treated as mapping to the same move path as `a[y]` as +//! well as `a[13]`, etc. +//! +//! (In theory, the analysis could be extended to work with sets of +//! paths, so that `a[0]` and `a[13]` could be kept distinct, while +//! `a[x]` would still overlap them both. But that is not this +//! representation does today.) + +use rustc_middle::mir::{Local, Operand, PlaceElem, ProjectionElem}; +use rustc_middle::ty::Ty; + +#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] +pub struct AbstractOperand; +#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] +pub struct AbstractType; +pub type AbstractElem = ProjectionElem<AbstractOperand, AbstractType>; + +pub trait Lift { + type Abstract; + fn lift(&self) -> Self::Abstract; +} +impl<'tcx> Lift for Operand<'tcx> { + type Abstract = AbstractOperand; + fn lift(&self) -> Self::Abstract { + AbstractOperand + } +} +impl Lift for Local { + type Abstract = AbstractOperand; + fn lift(&self) -> Self::Abstract { + AbstractOperand + } +} +impl<'tcx> Lift for Ty<'tcx> { + type Abstract = AbstractType; + fn lift(&self) -> Self::Abstract { + AbstractType + } +} +impl<'tcx> Lift for PlaceElem<'tcx> { + type Abstract = AbstractElem; + fn lift(&self) -> Self::Abstract { + match *self { + ProjectionElem::Deref => ProjectionElem::Deref, + ProjectionElem::Field(f, ty) => ProjectionElem::Field(f, ty.lift()), + ProjectionElem::Index(ref i) => ProjectionElem::Index(i.lift()), + ProjectionElem::Subslice { from, to, from_end } => { + ProjectionElem::Subslice { from, to, from_end } + } + ProjectionElem::ConstantIndex { offset, min_length, from_end } => { + ProjectionElem::ConstantIndex { offset, min_length, from_end } + } + ProjectionElem::Downcast(a, u) => ProjectionElem::Downcast(a, u), + } + } +} |