Struct Allocation 

pub struct Allocation {
    pub reg_map: HashMap<LcnfVarId, PhysReg>,
    pub spills: Vec<SpillSlot>,
    /* private fields */
}

The result of register allocation.

Fields

reg_map: HashMap<LcnfVarId, PhysReg>

Maps virtual register IDs to physical registers.

spills: Vec<SpillSlot>

Virtual registers that were spilled to the stack.

Implementations

impl Allocation

pub fn new() -> Self

Create an empty allocation.

pub fn assign(&mut self, vreg: LcnfVarId, preg: PhysReg)

Assign a physical register to a virtual register.

pub fn spill(&mut self, vreg: LcnfVarId, size: u32) -> SpillSlot

Spill a virtual register, returning the slot.

pub fn lookup(&self, vreg: LcnfVarId) -> Option<&PhysReg>

Look up the physical register for vreg.

pub fn is_spilled(&self, vreg: LcnfVarId) -> bool

Returns true if vreg was spilled.

pub fn stack_frame_size(&self) -> u32

Total stack frame size needed for spills.

Trait Implementations

impl Clone for Allocation

fn clone(&self) -> Allocation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Allocation

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

Formats the value using the given formatter.

impl Default for Allocation

fn default() -> Allocation

Returns the “default value” for a type.