Enum MoveError 

#[non_exhaustive]
pub enum MoveError {
    DuplicateDestination {
        index: usize,
    },
    ClassMismatch {
        index: usize,
    },
    NoScratch {
        class: RegClass,
    },
    NoTemp {
        class: RegClass,
    },
    TooMany,
}

Why a parallel copy could not be resolved.

Examples

use backend_lang::moves::{Move, MoveEnv, MoveError, MoveResolver};
use backend_lang::x86_64::{self, GPR, RAX, RBX};

let twice = [Move::new(RAX, RBX, GPR), Move::new(RAX, 1, GPR)];
let err = MoveResolver::new()
    .resolve(&x86_64::TARGET, &twice, &MoveEnv::new(), &mut Vec::new())
    .unwrap_err();
assert_eq!(err, MoveError::DuplicateDestination { index: 1 });

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

DuplicateDestination

Two moves write the same location; a parallel copy’s destinations are distinct. index is the later of the two.

Fields

index: usize

The move.

ClassMismatch

A register in move index is not in the move’s class (or the target has no such class or register).

Fields

index: usize

The move.

NoScratch

A cycle of class class needs a scratch location: no free register of the class, no swap, and no scratch slot was provided.

Fields

class: RegClass

The class.

NoTemp

A memory-to-memory move (or an immediate store) of class class needs a temporary register: no free register of the class, and no victim slot to borrow one with (or the class has no register to borrow).

Fields

class: RegClass

The class.

TooMany

More than u32::MAX - 2 moves in one parallel copy.

Trait Implementations

impl Clone for MoveError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MoveError

impl Debug for MoveError

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

Formats the value using the given formatter.

impl Display for MoveError

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

Formats the value using the given formatter.

impl Eq for MoveError

impl Error for MoveError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<MoveError> for EmitError

fn from(e: MoveError) -> EmitError

Converts to this type from the input type.

impl Hash for MoveError

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 PartialEq for MoveError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MoveError