[][src]Struct rustc_mir::util::elaborate_drops::DropCtxt

struct DropCtxt<'l, 'b: 'l, 'tcx: 'b, D> where
    D: DropElaborator<'b, 'tcx> + 'l, 
{ elaborator: &'l mut D, source_info: SourceInfo, place: &'l Place<'tcx>, path: D::Path, succ: BasicBlock, unwind: Unwind, }
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Fields

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Methods

impl<'l, 'b, 'tcx, D> DropCtxt<'l, 'b, 'tcx, D> where
    D: DropElaborator<'b, 'tcx>, 
[src]

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This elaborates a single drop instruction, located at bb, and patches over it.

The elaborated drop checks the drop flags to only drop what is initialized.

In addition, the relevant drop flags also need to be cleared to avoid double-drops. However, in the middle of a complex drop, one must avoid clearing some of the flags before they are read, as that would cause a memory leak.

In particular, when dropping an ADT, multiple fields may be joined together under the rest subpath. They are all controlled by the primary drop flag, but only the last rest-field dropped should clear it (and it must also not clear anything else).

FIXME: I think we should just control the flags externally and then we do not need this machinery.

Important traits for Vec<u8>

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Return the place and move path for each field of variant, (the move path is None if the field is a rest field).

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Important traits for Vec<u8>

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Create one-half of the drop ladder for a list of fields, and return the list of steps in it in reverse order, with the first step dropping 0 fields and so on.

unwind_ladder is such a list of steps in reverse order, which is called if the matching step of the drop glue panics.

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Create a full drop ladder, consisting of 2 connected half-drop-ladders

For example, with 3 fields, the drop ladder is

.d0: ELAB(drop location.0 [target=.d1, unwind=.c1]) .d1: ELAB(drop location.1 [target=.d2, unwind=.c2]) .d2: ELAB(drop location.2 [target=self.succ, unwind=self.unwind]) .c1: ELAB(drop location.1 [target=.c2]) .c2: ELAB(drop location.2 [target=self.unwind])

NOTE: this does not clear the master drop flag, so you need to point succ/unwind on a drop_ladder_bottom.

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create a loop that drops an array:

loop-block: can_go = cur == length_or_end if can_go then succ else drop-block drop-block: if ptr_based { ptr = &mut *cur cur = cur.offset(1) } else { ptr = &mut P[cur] cur = cur + 1 } drop(ptr)

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The slow-path - create an "open", elaborated drop for a type which is moved-out-of only partially, and patch bb to a jump to it. This must not be called on ADTs with a destructor, as these can't be moved-out-of, except for Box<T>, which is special-cased.

This creates a "drop ladder" that drops the needed fields of the ADT, both in the success case or if one of the destructors fail.

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Return a basic block that drop a place using the context and path in c. If mode is something, also clear c according to it.

if FLAG(self.path) if let Some(mode) = mode: FLAG(self.path)[mode] = false drop(self.place)

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Trait Implementations

impl<'l, 'b: 'l, 'tcx: 'b, D: Debug> Debug for DropCtxt<'l, 'b, 'tcx, D> where
    D: DropElaborator<'b, 'tcx> + 'l,
    D::Path: Debug
[src]

Formats the value using the given formatter. Read more

Auto Trait Implementations

impl<'l, 'b, 'tcx, D> !Send for DropCtxt<'l, 'b, 'tcx, D>

impl<'l, 'b, 'tcx, D> !Sync for DropCtxt<'l, 'b, 'tcx, D>

Blanket Implementations

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

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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>, 
[src]

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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
[src]

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
[src]