Enum ValType 

pub enum ValType {
    Bool,
    I8,
    I16,
    I32,
    I64,
    U8,
    U16,
    U32,
    U64,
    F32,
    F64,
    Char,
    Str,
    Dyn,
    Ref(TypeId),
}

The declared type of a register, a global, a field, or a parameter.

Every register slot is 64 bits wide. Scalars (bool, the integers, the floats, char) are stored unboxed in typed registers. Dyn holds a dynamically typed value (the NaN-boxed value of the dynamic languages). Str, Ref, and Dyn holding a heap object share one reference representation, and nil is the null reference, so a heap instruction works the same whichever of those registers holds the object. Declared types are what make a frame’s garbage-collection roots exact: a register is traced if and only if its type is_reference.

Examples

use bytecode_lang::{IntTy, TypeId, ValType};

assert_eq!(ValType::int(IntTy::U8), ValType::U8);
assert_eq!(ValType::I64.as_int(), Some(IntTy::I64));
assert!(ValType::Dyn.is_reference());
assert!(!ValType::F64.is_reference());
assert_eq!(ValType::Ref(TypeId(3)).to_string(), "ref t3");

Variants

Bool

false or true.

I8

Signed 8-bit integer.

I16

Signed 16-bit integer.

I32

Signed 32-bit integer.

I64

Signed 64-bit integer.

U8

Unsigned 8-bit integer.

U16

Unsigned 16-bit integer.

U32

Unsigned 32-bit integer.

U64

Unsigned 64-bit integer.

F32

IEEE 754 binary32.

F64

IEEE 754 binary64.

Char

A Unicode scalar value.

Str

An immutable byte string, or nil.

Dyn

A dynamically typed value of any Kind.

Ref(TypeId)

A reference to a heap object of the given type-table entry, or nil.

Implementations

impl ValType

pub const fn int(ty: IntTy) -> Self

The integer value type for ty.

Examples

use bytecode_lang::{IntTy, ValType};

assert_eq!(ValType::int(IntTy::I32), ValType::I32);

pub const fn float(ty: FloatTy) -> Self

The float value type for ty.

Examples

use bytecode_lang::{FloatTy, ValType};

assert_eq!(ValType::float(FloatTy::F32), ValType::F32);

pub const fn as_int(self) -> Option<IntTy>

The integer type, if this is an integer value type.

Examples

use bytecode_lang::{IntTy, ValType};

assert_eq!(ValType::U64.as_int(), Some(IntTy::U64));
assert_eq!(ValType::F64.as_int(), None);

pub const fn is_reference(self) -> bool

Whether a register of this type can hold a heap reference, and so is a garbage-collection root.

Examples

use bytecode_lang::{TypeId, ValType};

assert!(ValType::Str.is_reference());
assert!(ValType::Ref(TypeId(0)).is_reference());
assert!(!ValType::Bool.is_reference());

Trait Implementations

impl Clone for ValType

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 ValType

impl Debug for ValType

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

Formats the value using the given formatter.

impl Display for ValType

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

Formats the value using the given formatter.

impl Eq for ValType

impl Hash for ValType

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 ValType

fn cmp(&self, other: &Self) -> 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.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

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

Restrict a value to a certain range.

impl PartialEq for ValType

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for ValType

fn partial_cmp(&self, other: &Self) -> 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 StructuralPartialEq for ValType