Enum Expr 

pub enum Expr {
    Ident(String),
    Const(i64),
    Func(Box<Expr>, Box<Expr>),
    Binary(Box<BinaryExpr>),
    Unary(Box<UnaryExpr>),
}

Assembly uses constant expressions to avoid copying magic numbers around. Expr represents these constant expressions.

The run method evaluates the constant expression. The get_2bytes, get_byte and get_bit_index evaluate the constant expression but also convert to a specific low level type needed by instructions.

Variants

Ident(String)

Const(i64)

Func(Box<Expr>, Box<Expr>)

Binary(Box<BinaryExpr>)

Unary(Box<UnaryExpr>)

Implementations

impl Expr

pub fn binary(left: Expr, operator: BinaryOperator, right: Expr) -> Expr

pub fn unary(expr: Expr, operator: UnaryOperator) -> Expr

pub fn get_words( &self, constants: &dyn Context, ) -> Result<[u8; 2], ExprRunError>

pub fn get_double_words( &self, constants: &dyn Context, ) -> Result<[u8; 4], ExprRunError>

pub fn get_quad_words( &self, constants: &dyn Context, ) -> Result<[u8; 8], ExprRunError>

pub fn get_byte(&self, constants: &dyn Context) -> Result<u8, ExprRunError>

pub fn get_bit_index(&self, constants: &dyn Context) -> Result<u8, ExprRunError>

pub fn run(&self, constants: &dyn Context) -> Result<i64, ExprRunError>

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl Display for Expr

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

Formats the value using the given formatter.

impl PartialEq for Expr

fn eq(&self, other: &Expr) -> 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 Eq for Expr

impl StructuralPartialEq for Expr