seccamp_forum_2023_demo

Cargo.toml

[package]
name = "demo"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
gomicollector = "0.1.1"

main.go

use gomicollector::Heap;

fn main() {
    let heap_size = 3;
    let mut heap = Heap::<String>::new(heap_size);
    // allocate an object
    let obj1_id = heap.allocate("obj1".to_string());
    let obj1 = heap.get(obj1_id.unwrap());
    println!("obj1 allocated {:?}", obj1);
    // root -> obj1
    heap.root_set.insert(obj1_id.unwrap());

    // allocate obj2 which is unreachable from the root set
    let obj2_id = heap.allocate("obj2".to_string());
    let obj2 = heap.get(obj2_id.unwrap());
    println!("obj2 allocated: {:?}", obj2);

    let obj3_id = heap.allocate("Obj3".to_string());
    let obj3 = heap.get(obj3_id.unwrap());
    println!("obj3 allocated: {:?}", obj3);
    // root -> obj1 -> obj2
    heap.heap[obj1_id.unwrap()].set_head(obj2_id);
    // allocate obj4 and check gc collects obj3 memory
    println!("obj4 will be allocated");
    let _ = heap.allocate(format!("obj4"));
    // ojb1 and obj3 is still in the heap because the root points to it.
    println!("heap: {:#?}", heap);
    println!(
        "reachable set: {:?}",
        heap.reachable_set()
            .iter()
            .map(|id| heap.get_data(*id).clone())
            .collect::<Vec<String>>()
    );
}