Struct MemoryType

pub struct MemoryType {
    pub memory64: bool,
    pub shared: bool,
    pub initial: u64,
    pub maximum: Option<u64>,
    pub page_size_log2: Option<u32>,
}

Represents a memory’s type.

Fields

memory64: bool

Whether or not this is a 64-bit memory, using i64 as an index. If this is false it’s a 32-bit memory using i32 as an index.

This is part of the memory64 proposal in WebAssembly.

shared: bool

Whether or not this is a “shared” memory, indicating that it should be send-able across threads and the maximum field is always present for valid types.

This is part of the threads proposal in WebAssembly.

initial: u64

Initial size of this memory, in wasm pages.

For 32-bit memories (when memory64 is false) this is guaranteed to be at most u32::MAX for valid types.

maximum: Option<u64>

Optional maximum size of this memory, in wasm pages.

For 32-bit memories (when memory64 is false) this is guaranteed to be at most u32::MAX for valid types. This field is always present for valid wasm memories when shared is true.

page_size_log2: Option<u32>

The log base 2 of the memory’s custom page size.

Memory pages are, by default, 64KiB large (i.e. 2¹⁶ or 65536).

The custom-page-sizes proposal allows changing it to other values.

Implementations

impl MemoryType

pub fn index_type(&self) -> ValType

Gets the index type for the memory.

Trait Implementations

impl Clone for MemoryType

fn clone(&self) -> MemoryType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MemoryType

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

Formats the value using the given formatter.

impl<'a> FromReader<'a> for MemoryType

fn from_reader(reader: &mut BinaryReader<'a>) -> Result<Self>

Attempts to read Self from the provided binary reader, returning an error if it is unable to do so.

impl Hash for MemoryType

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 MemoryType

fn eq(&self, other: &MemoryType) -> 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 Copy for MemoryType

impl Eq for MemoryType

impl StructuralPartialEq for MemoryType