Enum Constraint

pub enum Constraint {
    Passable(Index),
    Haltable(Index),
    BreakableTo {
        breaks_from: Index,
        breaks_to: Index,
    },
}

Flow analysis works by using a constraint solver: we try to solve for whether every node in the graph is “passable”, and in the process of doing so, we also solve “haltable” and “breaks from within some node or its children to some given parent loop node” constraints.

Variants

Passable(Index)

A Passable constraint carries the information of which node we are trying to check is passable or not.

Haltable(Index)

A Haltable constraint for checking whether or not a node is “haltable”.

BreakableTo

A BreakableTo constraint for checking whether or not a loop can be “broken to” by a node within its body.

Fields

breaks_from: Index

The node we want to check for a Break.

breaks_to: Index

The loop we want to Break to.

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Constraint

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Constraint

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for Constraint

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Constraint

fn cmp(&self, other: &Constraint) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Constraint

fn eq(&self, other: &Constraint) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Constraint

fn partial_cmp(&self, other: &Constraint) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Constraint

impl Eq for Constraint

impl StructuralPartialEq for Constraint