Rust allocator backed by ESP-IDF

This is a memory allocator for Rust, backed by the ESP-IDF.

This is intended to be used on an ESP32, linked against the ESP-IDF. For more information see:

• https://github.com/ctron/rust-esp-container/
• https://github.com/ctron/rust-esp-template
• https://github.com/MabezDev/rust-xtensa.git
• https://quickhack.net/nom/blog/2019-05-14-build-rust-environment-for-esp32.html

Usage

Add the following to your main, application project:

extern crate esp_idf_alloc;

#[global_allocator]
static A: esp_idf_alloc::EspIdfAllocator = esp_idf_alloc::EspIdfAllocator;

Error handler

If you use a custom global allocator in your application, you will also need an error handler.

The following code will use the ESP-IDF abort() method to handle the error:

#![feature(alloc_error_handler)]

use core::alloc::Layout;

extern "C" {
    fn abort() -> !;
}

#[alloc_error_handler]
fn alloc_error(_layout: Layout) -> ! {
    unsafe {
        abort();
    }
}

Using with alloc

Also be sure to link in the alloc create, as you might want this. Add the following to your Xargo.toml:

[target.xtensa-esp32-none-elf.dependencies]
alloc={}