Struct StaticAllocator

#[repr(C, align(32))]
pub struct StaticAllocator<const SIZE: usize> { /* private fields */ }

Uses a statically pre-allocated section to allocate all memory.

Does not free up memory. Cannot grow beyond what was statically pre-allocated.

Never calls memory.grow.

Largely inspired by this blog post: https://surma.dev/things/rust-to-webassembly/

Implementations

impl<const SIZE: usize> StaticAllocator<SIZE>

pub const fn new() -> Self

Trait Implementations

impl<const SIZE: usize> GlobalAlloc for StaticAllocator<SIZE>

unsafe fn alloc(&self, layout: Layout) -> *mut u8

Allocates memory as described by the given layout.

unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout)

Deallocates the block of memory at the given ptr pointer with the given layout.

unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8

Behaves like alloc, but also ensures that the contents are set to zero before being returned.

unsafe fn realloc( &self, ptr: *mut u8, layout: Layout, new_size: usize, ) -> *mut u8

Shrinks or grows a block of memory to the given new_size in bytes. The block is described by the given ptr pointer and layout.

impl<const SIZE: usize> Sync for StaticAllocator<SIZE>