Function memory_guard_page_trap

tests/all/pooling_allocator.rs:136–196

()

#[test]
#[cfg_attr(miri, ignore)]
fn memory_guard_page_trap() -> Result<()> {
    let mut pool = crate::small_pool_config();
    pool.max_memory_size(2 << 16).table_elements(0);
    let mut config = Config::new();
    config.allocation_strategy(pool);

    let engine = Engine::new(&config)?;

    let module = Module::new(
        &engine,
        r#"
            (module
                (memory (export "m") 0)
                (func (export "f") (param i32) local.get 0 i32.load drop)
            )
        "#,
    )?;

    // Instantiate the module and check for out of bounds trap
    for _ in 0..10 {
        let mut store = Store::new(&engine, ());
        let instance = Instance::new(&mut store, &module, &[])?;
        let m = instance.get_memory(&mut store, "m").unwrap();
        let f = instance.get_typed_func::<i32, ()>(&mut store, "f")?;

        let trap = f
            .call(&mut store, 0)
            .expect_err("function should trap")
            .downcast::<Trap>()?;
        assert_eq!(trap, Trap::MemoryOutOfBounds);

        let trap = f
            .call(&mut store, 1)
            .expect_err("function should trap")
            .downcast::<Trap>()?;
        assert_eq!(trap, Trap::MemoryOutOfBounds);

        m.grow(&mut store, 1).expect("memory should grow");
        f.call(&mut store, 0).expect("function should not trap");

        let trap = f
            .call(&mut store, 65536)
            .expect_err("function should trap")
            .downcast::<Trap>()?;
        assert_eq!(trap, Trap::MemoryOutOfBounds);

        let trap = f
            .call(&mut store, 65537)
            .expect_err("function should trap")
            .downcast::<Trap>()?;
        assert_eq!(trap, Trap::MemoryOutOfBounds);

        m.grow(&mut store, 1).expect("memory should grow");
        f.call(&mut store, 65536).expect("function should not trap");

        m.grow(&mut store, 1)
            .expect_err("memory should be at the limit");
    }