[][src]Struct rustc_data_structures::obligation_forest::ObligationForest

pub struct ObligationForest<O: ForestObligation> {
    nodes: Vec<Node<O>>,
    done_cache: FxHashSet<O::Predicate>,
    waiting_cache: FxHashMap<O::Predicate, NodeIndex>,
    scratch: Option<Vec<usize>>,
}
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Fields

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The list of obligations. In between calls to process_obligations, this list only contains nodes in the Pending or Success state (with a non-zero number of incomplete children). During processing, some of those nodes may be changed to the error state, or we may find that they are completed (That is, num_incomplete_children drops to 0). At the end of processing, those nodes will be removed by a call to compress.

At all times we maintain the invariant that every node appears at a higher index than its parent. This is needed by the backtrace iterator (which uses split_at).

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A cache of predicates that have been successfully completed.

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An cache of the nodes in nodes, indexed by predicate.

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Methods

impl<O: ForestObligation> ObligationForest<O>
[src]

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Return the total number of nodes in the forest that have not yet been fully resolved.

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Registers an obligation

This CAN be done in a snapshot

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Important traits for Vec<u8>

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Convert all remaining obligations to the given error.

This cannot be done during a snapshot.

Important traits for Vec<u8>

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Returns the set of obligations that are in a pending state.

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Perform a pass through the obligation list. This must be called in a loop until outcome.stalled is false.

This CANNOT be unrolled (presently, at least).

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Mark all NodeState::Success nodes as NodeState::Done and report all cycles between them. This should be called after mark_as_waiting marks all nodes with pending subobligations as NodeState::Waiting.

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Important traits for Vec<u8>

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Returns a vector of obligations for p and all of its ancestors, putting them into the error state in the process.

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Marks all nodes that depend on a pending node as NodeState::Waiting.

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Important traits for Vec<u8>

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Compresses the vector, removing all popped nodes. This adjusts the indices and hence invalidates any outstanding indices. Cannot be used during a transaction.

Beforehand, all nodes must be marked as Done and no cycles on these nodes may be present. This is done by e.g. process_cycles.

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Auto Trait Implementations

impl<O> Send for ObligationForest<O> where
    O: Send,
    <O as ForestObligation>::Predicate: Send

impl<O> !Sync for ObligationForest<O>

Blanket Implementations

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
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impl<T> From for T
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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
[src]

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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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