Struct wasmtime_runtime::Table

pub struct Table(_);

Represents an instance’s table.

Implementations

impl Table

pub fn new_dynamic(plan: &TablePlan) -> Self

Create a new dynamic (movable) table instance for the specified table plan.

pub fn new_static(plan: &TablePlan, data: *mut *mut u8, maximum: u32) -> Self

Create a new static (immovable) table instance for the specified table plan.

pub fn element_type(&self) -> TableElementType

Returns the type of the elements in this table.

pub fn size(&self) -> u32

Returns the number of allocated elements.

pub fn maximum(&self) -> Option<u32>

Returns the maximum number of elements.

pub fn fill(&self, dst: u32, val: TableElement, len: u32) -> Result<(), Trap>

Fill table[dst..dst + len] with val.

Returns a trap error on out-of-bounds accesses.

pub unsafe fn grow(&self, delta: u32, init_value: TableElement) -> Option<u32>

Grow table by the specified amount of elements.

Returns the previous size of the table if growth is successful.

Returns None if table can’t be grown by the specified amount of elements, or if the init_value is the wrong kind of table element.

Unsafety

Resizing the table can reallocate its internal elements buffer. This table’s instance’s VMContext has raw pointers to the elements buffer that are used by Wasm, and they need to be fixed up before we call into Wasm again. Failure to do so will result in use-after-free inside Wasm.

Generally, prefer using InstanceHandle::table_grow, which encapsulates this unsafety.

pub fn get(&self, index: u32) -> Option<TableElement>

Get reference to the specified element.

Returns None if the index is out of bounds.

pub fn set(&self, index: u32, elem: TableElement) -> Result<(), ()>

Set reference to the specified element.

Errors

Returns an error if index is out of bounds or if this table type does not match the element type.

pub fn copy(
    dst_table: &Self,
    src_table: &Self,
    dst_index: u32,
    src_index: u32,
    len: u32
) -> Result<(), Trap>

Copy len elements from src_table[src_index..] into dst_table[dst_index..].

Errors

Returns an error if the range is out of bounds of either the source or destination tables.

pub fn vmtable(&self) -> VMTableDefinition

Return a VMTableDefinition for exposing the table to compiled wasm code.

Trait Implementations

impl Debug for Table

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

Formats the value using the given formatter.

impl Default for Table

fn default() -> Self

Returns the “default value” for a type.

impl Drop for Table

fn drop(&mut self)

Executes the destructor for this type.