Function private_entity_access

tests/all/debug.rs:389–485

()

#[test]
#[cfg_attr(miri, ignore)]
fn private_entity_access() -> wasmtime::Result<()> {
    let mut config = Config::default();
    config.guest_debug(true);
    config.wasm_gc(true);
    config.gc_support(true);
    config.wasm_exceptions(true);
    let engine = Engine::new(&config)?;
    let mut store = Store::new(&engine, ());
    let module = Module::new(
        &engine,
        r#"
        (module
          (import "" "i" (global (mut i32)))
          (import "" "f" (func (result i32)))
          (global $g (mut i32) (i32.const 0))
          (memory $m 1 1)
          (table $t 10 10 i31ref)
          (tag $tag (param f64))
          (func (export "main")
            ;; $g := 42
            i32.const 42
            global.set $g
            ;; $m[1024] := 1
            i32.const 1024
            i32.const 1
            i32.store8 $m
            ;; $t[1] := (ref.i31 (i32.const 100))
            i32.const 1
            i32.const 100
            ref.i31
            table.set $t)

          (func (param i32)
            local.get 0
            global.set $g))
        "#,
    )?;

    let host_global = Global::new(
        &mut store,
        GlobalType::new(ValType::I32, Mutability::Var),
        Val::I32(1000),
    )?;
    let host_func = Func::wrap(&mut store, |_caller: Caller<'_, ()>| -> i32 { 7 });

    let instance = Instance::new(
        &mut store,
        &module,
        &[Extern::Global(host_global), Extern::Func(host_func)],
    )?;
    let func = instance.get_func(&mut store, "main").unwrap();
    func.call(&mut store, &[], &mut [])?;

    // Nothing is exported except for `main`, yet we can still access
    // (below).
    let exports = instance.exports(&mut store).collect::<Vec<_>>();
    assert_eq!(exports.len(), 1);
    assert!(exports.into_iter().next().unwrap().into_func().is_some());