pub struct DefinitelyInitializedPlaces<'a, 'tcx> {
    tcx: TyCtxt<'tcx>,
    body: &'a Body<'tcx>,
    mdpe: &'a MoveDataParamEnv<'tcx>,
}
Expand description

DefinitelyInitializedPlaces tracks all places that are definitely initialized upon reaching a particular point in the control flow for a function.

For example, in code like the following, we have corresponding dataflow information shown in the right-hand comments.

struct S;
fn foo(pred: bool) {                        // definite-init:
                                            // {          }
    let a = S; let mut b = S; let c; let d; // {a, b      }

    if pred {
        drop(a);                            // {   b,     }
        b = S;                              // {   b,     }

    } else {
        drop(b);                            // {a,        }
        d = S;                              // {a,       d}

    }                                       // {          }

    c = S;                                  // {       c  }
}

To determine whether a place may be uninitialized at a particular control-flow point, one can take the set-complement of this data.

Similarly, at a given drop statement, the set-difference between this data and MaybeInitializedPlaces yields the set of places that would require a dynamic drop-flag at that statement.

Fields

tcx: TyCtxt<'tcx>body: &'a Body<'tcx>mdpe: &'a MoveDataParamEnv<'tcx>

Implementations

Trait Implementations

Use set intersection as the join operator.

A descriptive name for this analysis. Used only for debugging. Read more

The initial value of the dataflow state upon entry to each basic block.

Mutates the initial value of the dataflow state upon entry to the START_BLOCK. Read more

The direction of this analysis. Either Forward or Backward.

See Analysis::apply_statement_effect.

See Analysis::apply_terminator_effect.

See Analysis::apply_call_return_effect.

See Analysis::apply_before_statement_effect.

See Analysis::apply_before_terminator_effect.

See Analysis::apply_yield_resume_effect.

See Analysis::apply_switch_int_edge_effects.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. 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: 24 bytes