Struct rustc_mir::borrow_check::MirBorrowckCtxt[][src]

pub struct MirBorrowckCtxt<'cx, 'gcx: 'tcx, 'tcx: 'cx> {
    tcx: TyCtxt<'cx, 'gcx, 'tcx>,
    mir: &'cx Mir<'tcx>,
    mir_def_id: DefId,
    move_data: &'cx MoveData<'tcx>,
    param_env: ParamEnv<'gcx>,
    movable_generator: bool,
    locals_are_invalidated_at_exit: bool,
    access_place_error_reported: FxHashSet<(Place<'tcx>, Span)>,
    reservation_error_reported: FxHashSet<Place<'tcx>>,
    moved_error_reported: FxHashSet<Place<'tcx>>,
    used_mut: FxHashSet<Local>,
    used_mut_upvars: SmallVec<[Field; 8]>,
    nonlexical_regioncx: Rc<RegionInferenceContext<'tcx>>,
    nonlexical_cause_info: Option<RegionCausalInfo>,
    borrow_set: Rc<BorrowSet<'tcx>>,
    dominators: Dominators<BasicBlock>,
}
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Fields

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This keeps track of whether local variables are free-ed when the function exits even without a StorageDead, which appears to be the case for constants.

I'm not sure this is the right approach - @eddyb could you try and figure this out?

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This field keeps track of when borrow errors are reported in the access_place function so that there is no duplicate reporting. This field cannot also be used for the conflicting borrow errors that is handled by the reservation_error_reported field as the inclusion of the Span type (while required to mute some errors) stops the muting of the reservation errors.

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This field keeps track of when borrow conflict errors are reported for reservations, so that we don't report seemingly duplicate errors for corresponding activations

FIXME: Ideally this would be a set of BorrowIndex, not Places, but it is currently inconvenient to track down the BorrowIndex at the time we detect and report a reservation error.

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This field keeps track of errors reported in the checking of moved variables, so that we don't report report seemingly duplicate errors.

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This field keeps track of all the local variables that are declared mut and are mutated. Used for the warning issued by an unused mutable local variable.

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If the function we're checking is a closure, then we'll need to report back the list of mutable upvars that have been used. This field keeps track of them.

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Non-lexical region inference context, if NLL is enabled. This contains the results from region inference and lets us e.g. find out which CFG points are contained in each borrow region.

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The set of borrows extracted from the MIR

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Dominators for MIR

Methods

impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Finds the span of arguments of a closure (within maybe_closure_span) and its usage of the local assigned at location. This is done by searching in statements succeeding location and originating from maybe_closure_span.

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impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

Important traits for Prefixes<'cx, 'gcx, 'tcx>

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Returns an iterator over the prefixes of place (inclusive) from longest to smallest, potentially terminating the iteration early based on kind.

impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Adds annotations to err explaining why the borrow contains the point from context. This is key for the "3-point errors" described in the NLL RFC.

impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Returns true if the borrow represented by kind is allowed to be split into separate Reservation and Activation phases.

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Invokes access_place as appropriate for dropping the value at drop_place. Note that the actual Drop in the MIR is always for a variable (e.g., Drop(x)) -- but we recursively break this variable down into subpaths (e.g., Drop(x.foo)) to indicate more precisely which fields might actually be accessed by a destructor.

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Checks an access to the given place to see if it is allowed. Examines the set of borrows that are in scope, as well as which paths have been initialized, to ensure that (a) the place is initialized and (b) it is not borrowed in some way that would prevent this access.

Returns true if an error is reported, false otherwise.

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Returns whether a borrow of this place is invalidated when the function exits

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Reports an error if this is a borrow of local data. This is called for all Yield statements on movable generators

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impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Currently MoveData does not store entries for all places in the input MIR. For example it will currently filter out places that are Copy; thus we do not track places of shared reference type. This routine will walk up a place along its prefixes, searching for a foundational place that is tracked in the MoveData.

An Err result includes a tag indicated why the search failed. Currently this can only occur if the place is built off of a static variable, as we do not track those in the MoveData.

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Check the permissions for the given place and read or write kind

Returns true if an error is reported, false otherwise.

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Adds the place into the used mutable variables set

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Whether this value be written or borrowed mutably. Returns the root place if the place passed in is a projection.

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If this is a field projection, and the field is being projected from a closure type, then returns the index of the field being projected. Note that this closure will always be self in the current MIR, because that is the only time we directly access the fields of a closure type.

impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Returns whether an access of kind access to access_place conflicts with a borrow/full access to borrow_place (for deep accesses to mutable locations, this function is symmetric between borrow_place & access_place).

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This function iterates over all of the in-scope borrows that conflict with an access to a place, invoking the op callback for each one.

"Current borrow" here means a borrow that reaches the point in the control-flow where the access occurs.

The borrow's phase is represented by the IsActive parameter passed to the callback.

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impl<'cx, 'gcx, 'tcx> MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Returns the base of the leftmost (deepest) dereference of an Box in place. If there is no dereference of an Box in place, then it just returns place itself.

Trait Implementations

impl<'cx, 'gcx, 'tcx> DataflowResultsConsumer<'cx, 'tcx> for MirBorrowckCtxt<'cx, 'gcx, 'tcx>
[src]

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Auto Trait Implementations

impl<'cx, 'gcx, 'tcx> !Send for MirBorrowckCtxt<'cx, 'gcx, 'tcx>

impl<'cx, 'gcx, 'tcx> !Sync for MirBorrowckCtxt<'cx, 'gcx, 'tcx>