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

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>,
    location_table: &'cx LocationTable,
    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>>,
    errors_buffer: Vec<Diagnostic>,
    used_mut: FxHashSet<Local>,
    used_mut_upvars: SmallVec<[Field; 8]>,
    nonlexical_regioncx: Rc<RegionInferenceContext<'tcx>>,
    borrow_set: Rc<BorrowSet<'tcx>>,
    dominators: Dominators<BasicBlock>,
}
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Fields

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Map from MIR Location to LocationIndex; created when MIR borrowck begins.

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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 seemingly duplicate errors.

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Errors to be reported buffer

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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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Important traits for Vec<u8>

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Reports an illegal reassignment; for example, an assignment to (part of) a non-mut local that occurs potentially after that local has already been initialized. place is the path being assigned; err_place is a place providing a reason why place is not mutable (e.g. the non-mut local x in an assignment to x.f).

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

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Check if a place is a thread-local static.

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

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Finds the spans associated to a move or copy of move_place at location.

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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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Helper to retrieve span(s) of given borrow from the current MIR representation

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

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Important traits for Vec<u8>

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impl<'a, 'gcx, 'tcx> MirBorrowckCtxt<'a, '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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Walks the MIR looking for assignments to a set of locals, as part of the unused mutable local variables lint, to update the context's used_mut in a single walk.

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.

Parameters

  • borrow: the borrow in question
  • context: where the borrow occurs
  • kind_place: if Some, this describes the statement that triggered the error.
    • first half is the kind of write, if any, being performed
    • second half is the place being accessed
  • err: where the error annotations are going to be added

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Finds the reason that [explain_why_borrow_contains_point] will report but doesn't add it to any message. This is a separate function in case the caller wants to change the error they report based on the reason that will be reported.

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Adds annotations to err for the explanation reason. This is a separate method so that the caller can change their error message based on the reason that is going to be reported.

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Check if a borrow location is within a loop.

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

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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.

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>

Blanket Implementations

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T

impl<T> MaybeResult for T
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impl<'a, T> Captures for T where
    T: ?Sized
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