Crate smalloc

Smalloc is a small and simple memory allocator for Solana programs.

Usage:

1. Add this crate as dependency

2. Add a dummy feature called “custom-heap” in Cargo.toml:

[features]
default = ["custom-heap"]
custom-heap = []

3. Put this in your entrypoint.rs

// START: Heap start
// LENGTH: Heap length
// MIN: Minimal allocation size
// PAGE_SIZE: Allocation page size
#[cfg(target_os = "solana")]
#[global_allocator]
static ALLOC: Smalloc<{ HEAP_START_ADDRESS as usize }, { HEAP_LENGTH as usize }, 16, 1024> =
    Smalloc::new();

Note: The “dynamic_start” feature is for unit tests.

Structs

Smalloc