Struct rustc_infer::infer::lexical_region_resolve::LexicalResolver

struct LexicalResolver<'cx, 'tcx> {
    region_rels: &'cx RegionRelations<'cx, 'tcx>,
    var_infos: VarInfos,
    data: RegionConstraintData<'tcx>,
}

Fields

region_rels: &'cx RegionRelations<'cx, 'tcx>

var_infos: VarInfos

data: RegionConstraintData<'tcx>

Implementations

impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx>

fn tcx(&self) -> TyCtxt<'tcx>

fn infer_variable_values(
    &mut self,
    errors: &mut Vec<RegionResolutionError<'tcx>>
) -> LexicalRegionResolutions<'tcx>

fn num_vars(&self) -> usize

fn construct_var_data(
    &self,
    tcx: TyCtxt<'tcx>
) -> LexicalRegionResolutions<'tcx>

Initially, the value for all variables is set to 'empty, the empty region. The expansion phase will grow this larger.

fn erased_data(&self, tcx: TyCtxt<'tcx>) -> LexicalRegionResolutions<'tcx>

An erased version of the lexical region resolutions. Used when we’re erasing regions and suppressing errors: in item bodies with -Zborrowck=mir.

fn dump_constraints(&self, free_regions: &RegionRelations<'_, 'tcx>)

fn expand_givens(&mut self, graph: &Graph<(), Constraint<'_>>)

fn enforce_member_constraints(
    &self,
    graph: &Graph<(), Constraint<'tcx>>,
    var_values: &mut LexicalRegionResolutions<'tcx>
) -> bool

Enforce all member constraints and return true if anything changed. See enforce_member_constraint for more details.

fn enforce_member_constraint(
    &self,
    graph: &Graph<(), Constraint<'tcx>>,
    member_constraint: &MemberConstraint<'tcx>,
    var_values: &mut LexicalRegionResolutions<'tcx>
) -> bool

Enforce a constraint like

'r member of ['c...]

We look for all choice regions from the list 'c... that:

(a) are greater than the current value of 'r (which is a lower bound)

and

(b) are compatible with the upper bounds of 'r that we can find by traversing the graph.

From that list, we look for a minimal option 'c_min. If we find one, then we can enforce that 'r: 'c_min.

fn expansion(&self, var_values: &mut LexicalRegionResolutions<'tcx>)

fn expand_node(
    &self,
    a_region: Region<'tcx>,
    b_vid: RegionVid,
    b_data: &mut VarValue<'tcx>
) -> bool

fn sub_concrete_regions(&self, a: Region<'tcx>, b: Region<'tcx>) -> bool

True if a <= b, but not defined over inference variables.

fn lub_concrete_regions(&self, a: Region<'tcx>, b: Region<'tcx>) -> Region<'tcx>

Returns the least-upper-bound of a and b; i.e., the smallest region c such that a <= c and b <= c.

Neither a nor b may be an inference variable (hence the term “concrete regions”).

fn collect_errors(
    &self,
    var_data: &mut LexicalRegionResolutions<'tcx>,
    errors: &mut Vec<RegionResolutionError<'tcx>>
)

After expansion is complete, go and check upper bounds (i.e., cases where the region cannot grow larger than a fixed point) and check that they are satisfied.

fn collect_var_errors(
    &self,
    var_data: &LexicalRegionResolutions<'tcx>,
    graph: &Graph<(), Constraint<'tcx>>,
    errors: &mut Vec<RegionResolutionError<'tcx>>
)

Go over the variables that were declared to be error variables and create a RegionResolutionError for each of them.

fn construct_graph(&self) -> Graph<(), Constraint<'tcx>>

fn collect_error_for_expanding_node(
    &self,
    graph: &Graph<(), Constraint<'tcx>>,
    dup_vec: &mut IndexVec<RegionVid, Option<RegionVid>>,
    node_idx: RegionVid,
    errors: &mut Vec<RegionResolutionError<'tcx>>
)

fn collect_bounding_regions(
    &self,
    graph: &Graph<(), Constraint<'tcx>>,
    orig_node_idx: RegionVid,
    dir: Direction,
    dup_vec: Option<&mut IndexVec<RegionVid, Option<RegionVid>>>
) -> (Vec<RegionAndOrigin<'tcx>>, FxHashSet<RegionVid>, bool)

Collects all regions that “bound” the variable orig_node_idx in the given direction.

If dup_vec is Some it’s used to track duplicates between successive calls of this function.

The return tuple fields are:

• a list of all concrete regions bounding the given region.
• the set of all region variables bounding the given region.
• a bool that’s true if the returned region variables overlap with those returned by a previous call for another region.

fn bound_is_met(
    &self,
    bound: &VerifyBound<'tcx>,
    var_values: &LexicalRegionResolutions<'tcx>,
    generic_ty: Ty<'tcx>,
    min: Region<'tcx>
) -> bool

Layout

Note: Most layout information is completely unstable and may be different between compiler versions and platforms. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 136 bytes