Enum ExtendedOpcode

#[repr(u16)]
pub enum ExtendedOpcode {
    Trap = 0,
    Nop = 1,
    CallIndirectHost = 2,
}

An extended opcode.

Variants

Trap = 0

Raise a trap.

Nop = 1

Do nothing.

CallIndirectHost = 2

A special opcode to use an indirect function call to reenter the host from the interpreter.

This is used to implement host intrinsics such as memory.grow for example where that needs to reenter the host from the interpreter.

The sig immediate here is the Nth signature in the for_each_host_signature! macro below. The 0th “argument”, in register x0, is the function pointer that’s being called and all further arguments follow after that in registers.

Implementations

impl ExtendedOpcode

pub const MAX: u16 = 3u16

The value of the maximum defined extended opcode.

impl ExtendedOpcode

pub fn new(bytes: u16) -> Option<Self>

Create a new ExtendedOpcode from the given bytes.

Returns None if bytes is not a valid extended opcode.

pub unsafe fn unchecked_new(byte: u16) -> Self

Like new but does not check whether bytes is a valid opcode.

Safety

It is unsafe to pass bytes that is not a valid opcode.

Trait Implementations

impl Clone for ExtendedOpcode

fn clone(&self) -> ExtendedOpcode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ExtendedOpcode

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

Formats the value using the given formatter.

impl Decode for ExtendedOpcode

Available on crate feature decode only.

fn decode<T>(bytecode: &mut T) -> Result<Self, T::Error>

where T: BytecodeStream,

Decode this type from the given bytecode stream.

impl Hash for ExtendedOpcode

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 ExtendedOpcode

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

impl PartialEq for ExtendedOpcode

fn eq(&self, other: &ExtendedOpcode) -> 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 PartialOrd for ExtendedOpcode

fn partial_cmp(&self, other: &ExtendedOpcode) -> 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 Copy for ExtendedOpcode

impl Eq for ExtendedOpcode

impl StructuralPartialEq for ExtendedOpcode