AOT 问题消息 Attempting to JIT compile method with Pinvoke on Xamarin iOS

Question

我正面临消息 Attempting to JIT compile method '(wrapper managed-to-native) ;...wrapper_aot_native (object)' while 运行 --aot-只有.

我有一个包含方法指针的结构，应该由本机函数（称为 LoadContext）初始化，这个结构看起来像这样：

[StructLayout (LayoutKind.Sequential)]
public struct WrapperContext
{
    public int ctxVersion;

    public unsafe GetLibraryVersionXDelegate GetLibraryVersion;

    public unsafe GetLibraryDateXDelegate GetLibraryDate;

    public unsafe InitCallbackTableXDelegate InitCallbackTable;

    .....
}

当我调用应该初始化 WrapperContext 结构的 LoadContext 本机方法时，运行时抛出了以下异常：

Attempting to JIT compile method '(wrapper managed-to-native) XXXXX.XXXXXX.XXXXX.GetLibraryVersionXDelegate:wrapper_aot_native (object)' while running with --aot-only. See http://docs.xamarin.com/ios/about/limitations for more information.

为了解决这个问题，我创建了另一个结构，其中包含完全相同的字段列表，但将委托类型替换为 IntPtr:

[StructLayout (LayoutKind.Sequential)]
public struct WrapperContext2
{
    public int ctxVersion;

    public IntPtr GetLibraryVersionXDelegate GetLibraryVersion;

    public IntPtr GetLibraryDateXDelegate GetLibraryDate;

    public IntPtr InitCallbackTableXDelegate InitCallbackTable;

    .....
}

现在，对我的本机 LoadContext 的调用工作正常，我得到了每个函数的指针，但是当尝试使用 Marshal.GetFunctionPointerForDelegate() 将函数指针转换为其委托表示时，出现完全相同的异常被运行时抛出：

Attempting to JIT compile method '(wrapper managed-to-native) XXXXX.XXXXXX.XXXXX.GetLibraryVersionXDelegate:wrapper_aot_native (object)' while running with --aot-only. See http://docs.xamarin.com/ios/about/limitations for more information.

感谢您的帮助。

Answer 1

我终于通过在每个委托定义上添加 UnmanagedFunctionPointer 属性解决了这个问题：

[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public unsafe delegate IntPtr GetLibraryVersionXDelegate();

[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public unsafe delegate IntPtr GetLibraryDateXDelegate();

希望这对其他人有帮助。

AOT 问题消息 Attempting to JIT compile method with Pinvoke on Xamarin iOS

AOT issue with message Attempting to JIT compile method with Pinvoke on Xamarin iOS

c#

c++

pinvoke

ios

xamarin