Enum Switch

pub enum Switch {
    If(Operand, Block, Block),
    SwitchInt(Operand, IntegerTy, Vec<(Vec<ScalarValue>, Block)>, Block),
    Match(Place, Vec<(Vec<VariantId>, Block)>, Option<Block>),
}

Variants

If(Operand, Block, Block)

Gives the if block and the else block. The Operand is the condition of the if, e.g. if (y == 0) could become

v@3 := copy y; // Represented as `Assign(v@3, Use(Copy(y))`
v@2 := move v@3 == 0; // Represented as `Assign(v@2, BinOp(BinOp::Eq, Move(y), Const(0)))`
if (move v@2) { // Represented as `If(Move(v@2), <then branch>, <else branch>)`

SwitchInt(Operand, IntegerTy, Vec<(Vec<ScalarValue>, Block)>, Block)

Gives the integer type, a map linking values to switch branches, and the otherwise block. Note that matches over enumerations are performed by switching over the discriminant, which is an integer. Also, we use a Vec to make sure the order of the switch branches is preserved.

Rk.: we use a vector of values, because some of the branches may be grouped together, like for the following code:

match e {
  E::V1 | E::V2 => ..., // Grouped
  E::V3 => ...
}

Match(Place, Vec<(Vec<VariantId>, Block)>, Option<Block>)

A match over an ADT.

The match statement is introduced in [crate::remove_read_discriminant] (whenever we find a discriminant read, we merge it with the subsequent switch into a match).

Implementations

impl Switch

pub fn is_if(&self) -> bool

pub fn is_switch_int(&self) -> bool

pub fn is_match(&self) -> bool

impl Switch

pub fn to_if(self) -> Option<(Operand, Block, Block)>

pub fn to_switch_int( self, ) -> Option<(Operand, IntegerTy, Vec<(Vec<ScalarValue>, Block)>, Block)>

pub fn to_match( self, ) -> Option<(Place, Vec<(Vec<VariantId>, Block)>, Option<Block>)>

impl Switch

pub fn as_if(&self) -> Option<(&Operand, &Block, &Block)>

pub fn as_switch_int( &self, ) -> Option<(&Operand, &IntegerTy, &Vec<(Vec<ScalarValue>, Block)>, &Block)>

pub fn as_match( &self, ) -> Option<(&Place, &Vec<(Vec<VariantId>, Block)>, &Option<Block>)>

impl Switch

pub fn as_if_mut(&mut self) -> Option<(&mut Operand, &mut Block, &mut Block)>

pub fn as_switch_int_mut( &mut self, ) -> Option<(&mut Operand, &mut IntegerTy, &mut Vec<(Vec<ScalarValue>, Block)>, &mut Block)>

pub fn as_match_mut( &mut self, ) -> Option<(&mut Place, &mut Vec<(Vec<VariantId>, Block)>, &mut Option<Block>)>

impl Switch

pub fn variant_name(&self) -> &'static str

impl Switch

pub fn variant_index_arity(&self) -> (u32, usize)

impl Switch

pub fn iter_targets(&self) -> impl Iterator<Item = &Block>

pub fn iter_targets_mut(&mut self) -> impl Iterator<Item = &mut Block>

Trait Implementations

impl Clone for Switch

fn clone(&self) -> Switch

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Switch

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Switch

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Drive for Switch

fn drive<V: Visitor>(&self, visitor: &mut V)

impl DriveMut for Switch

fn drive_mut<V: VisitorMut>(&mut self, visitor: &mut V)

impl Serialize for Switch

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.