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

EverInitializedPlaces tracks all places that might have ever been initialized upon reaching a particular point in the control flow for a function, without an intervening StorageDead.

This dataflow is used to determine if an immutable local variable may be assigned to.

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

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

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

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

    }                                       // {a, b,    d }

    c = S;                                  // {a, b, c, d }
}

Fields

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

Implementations

Trait Implementations

The type that holds the dataflow state at any given point in the program.
A descriptive name for this analysis. Used only for debugging. Read more
Returns 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