Function guards_present

tests/all/memory.rs:147–191

()

#[cfg_attr(miri, ignore)]
#[cfg_attr(asan, ignore)]
fn guards_present() -> Result<()> {
    const GUARD_SIZE: u64 = 65536;

    let mut config = Config::new();
    config.memory_reservation(1 << 20);
    config.memory_guard_size(GUARD_SIZE);
    config.guard_before_linear_memory(true);
    let engine = Engine::new(&config)?;
    let mut store = Store::new(&engine, ());
    let static_mem = Memory::new(&mut store, MemoryType::new(1, Some(2)))?;
    let dynamic_mem = Memory::new(&mut store, MemoryType::new(1, None))?;

    let assert_guards = |store: &Store<()>| unsafe {
        // guards before
        println!("check pre-static-mem");
        assert_faults(static_mem.data_ptr(&store).offset(-(GUARD_SIZE as isize)));
        println!("check pre-dynamic-mem");
        assert_faults(dynamic_mem.data_ptr(&store).offset(-(GUARD_SIZE as isize)));

        // guards after
        println!("check post-static-mem");
        assert_faults(
            static_mem
                .data_ptr(&store)
                .add(static_mem.data_size(&store)),
        );
        println!("check post-dynamic-mem");
        assert_faults(
            dynamic_mem
                .data_ptr(&store)
                .add(dynamic_mem.data_size(&store)),
        );
    };
    assert_guards(&store);
    // static memory should start with the second page unmapped
    unsafe {
        assert_faults(static_mem.data_ptr(&store).add(65536));
    }
    println!("growing");
    static_mem.grow(&mut store, 1).unwrap();
    dynamic_mem.grow(&mut store, 1).unwrap();
    assert_guards(&store);

    Ok(())
}

#[wasmtime_test]
#[cfg_attr(miri, ignore)]