Function TestPanicTraps

func_test.go:395–434

(t *testing.T)

}

func TestPanicTraps(t *testing.T) {
	wasm, err := Wat2Wasm(`
	(module
		(import "" "" (func $i (param i32)))
		(func (export "h")
		    i32.const 0
		    call $i
		    i32.const 1
		    call $i)
	)`)
	require.NoError(t, err)

	store := NewStore(NewEngine())
	correctPanic := false
	f := WrapFunc(store, func(arg int32) {
		if arg == 0 {
			correctPanic = true
			panic("got the right argument")
		} else {
			correctPanic = false
			panic("expected zero")
		}
	})

	module, err := NewModule(store.Engine, wasm)
	require.NoError(t, err)

	instance, err := NewInstance(store, module, []AsExtern{f})
	require.NoError(t, err)

	f = instance.GetFunc(store, "h")
	var lastPanic interface{}
	func() {
		defer func() { lastPanic = recover() }()
		f.Call(store)
		panic("should have panicked")
	}()
	require.NotNil(t, lastPanic, "expected a panic")
	require.True(t, correctPanic, "wasm was resumed after initial panic")
}