internal unsafe static uint GetTokenReference(Type type, bool throw_exception = true)
{
if (type.IsGenericType)
{
type = type.GetGenericTypeDefinition();
}
var asm_name = type.Module.Assembly.GetName().Name;
// First check if there's a full token reference to this type
var token = GetFullTokenReference(asm_name, type.Module.MetadataToken, type.MetadataToken);
if (token != uint.MaxValue)
{
return(token);
}
// If type.Module.MetadataToken != 1, then the token must be a full token, which is not the case because we've already checked, so throw an exception.
if (type.Module.MetadataToken != 1)
{
if (!throw_exception)
{
return(Runtime.INVALID_TOKEN_REF);
}
throw ErrorHelper.CreateError(8025, $"Failed to compute the token reference for the type '{type.AssemblyQualifiedName}' because its module's metadata token is {type.Module.MetadataToken} when expected 1.");
}
var map = Runtime.options->RegistrationMap;
// Find the assembly index in our list of registered assemblies.
int assembly_index = -1;
for (int i = 0; i < map->assembly_count; i++)
{
var name_ptr = Marshal.ReadIntPtr(map->assembly, (int)i * IntPtr.Size);
if (Runtime.StringEquals(name_ptr, asm_name))
{
assembly_index = i;
break;
}
}
// If the assembly isn't registered, then the token must be a full token (which it isn't, because we've already checked).
if (assembly_index == -1)
{
if (!throw_exception)
{
return(Runtime.INVALID_TOKEN_REF);
}
throw ErrorHelper.CreateError(8025, $"Failed to compute the token reference for the type '{type.AssemblyQualifiedName}' because the assembly couldn't be found in the list of registered assemblies.");
}
if (assembly_index > 127)
{
if (!throw_exception)
{
return(Runtime.INVALID_TOKEN_REF);
}
throw ErrorHelper.CreateError(8025, $"Failed to compute the token reference for the type '{type.AssemblyQualifiedName}' because the assembly index {assembly_index} is not valid (must be <= 127).");
}
return((uint)((type.MetadataToken << 8) + (assembly_index << 1)));
}
internal static IntPtr GetBlockForDelegate(MethodInfo minfo, object @delegate, string signature)
{
if (@delegate == null)
{
return(IntPtr.Zero);
}
if (!(@delegate is Delegate))
{
throw ErrorHelper.CreateError(8016, "Unable to convert delegate to block for the return value for the method {0}.{1}, because the input isn't a delegate, it's a {1}. Please file a bug at http://bugzilla.xamarin.com.", minfo.DeclaringType.FullName, minfo.Name, @delegate.GetType().FullName);
}
var baseMethod = minfo.GetBaseDefinition();
var delegateProxies = baseMethod.ReturnTypeCustomAttributes.GetCustomAttributes(typeof(DelegateProxyAttribute), false);
if (delegateProxies.Length == 0)
{
throw ErrorHelper.CreateError(8011, "Unable to locate the delegate to block conversion attribute ([DelegateProxy]) for the return value for the method {0}.{1}. Please file a bug at http://bugzilla.xamarin.com.", baseMethod.DeclaringType.FullName, baseMethod.Name);
}
var delegateProxy = (DelegateProxyAttribute)delegateProxies [0];
if (delegateProxy.DelegateType == null)
{
throw ErrorHelper.CreateError(8012, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: DelegateType is null. Please file a bug at http://bugzilla.xamarin.com.", baseMethod.DeclaringType.FullName, baseMethod.Name);
}
var delegateProxyField = delegateProxy.DelegateType.GetField("Handler", BindingFlags.NonPublic | BindingFlags.Static);
if (delegateProxyField == null)
{
throw ErrorHelper.CreateError(8013, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: DelegateType ({2}) specifies a type without a 'Handler' field. Please file a bug at http://bugzilla.xamarin.com.", baseMethod.DeclaringType.FullName, baseMethod.Name, delegateProxy.DelegateType.FullName);
}
var handlerDelegate = delegateProxyField.GetValue(null);
if (handlerDelegate == null)
{
throw ErrorHelper.CreateError(8014, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: The DelegateType's ({2}) 'Handler' field is null. Please file a bug at http://bugzilla.xamarin.com.", baseMethod.DeclaringType.FullName, baseMethod.Name, delegateProxy.DelegateType.FullName);
}
if (!(handlerDelegate is Delegate))
{
throw ErrorHelper.CreateError(8015, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: The DelegateType's ({2}) 'Handler' field is not a delegate, it's a {3}. Please file a bug at http://bugzilla.xamarin.com.", baseMethod.DeclaringType.FullName, baseMethod.Name, delegateProxy.DelegateType.FullName, handlerDelegate.GetType().FullName);
}
// We now have the information we need to create the block.
// Note that we must create a heap-allocated block, so we
// start off by creating a stack-allocated block, and then
// call _Block_copy, which will create a heap-allocated block
// with the proper reference count.
BlockLiteral block = new BlockLiteral();
if (signature == null)
{
if (Runtime.DynamicRegistrationSupported)
{
block.SetupBlock((Delegate)handlerDelegate, (Delegate)@delegate);
}
else
{
throw ErrorHelper.CreateError(8026, $"BlockLiteral.GetBlockForDelegate with a null signature is not supported when the dynamic registrar has been linked away (delegate type: {@delegate.GetType ().FullName}).");
}
}
else
{
block.SetupBlockImpl((Delegate)handlerDelegate, (Delegate)@delegate, true, signature);
}
var rv = _Block_copy(ref block);
block.CleanupBlock();
return(rv);
}
internal static IntPtr GetBlockForDelegate(MethodInfo minfo, object @delegate, uint token_ref, string signature)
{
if (@delegate == null)
{
return(IntPtr.Zero);
}
if (!(@delegate is Delegate))
{
throw ErrorHelper.CreateError(8016, "Unable to convert delegate to block for the return value for the method {0}.{1}, because the input isn't a delegate, it's a {1}. Please file a bug at https://github.com/xamarin/xamarin-macios/issues/new.", minfo.DeclaringType.FullName, minfo.Name, @delegate.GetType().FullName);
}
Type delegateProxyType = GetDelegateProxyType(minfo, token_ref, out var baseMethod);
if (baseMethod == null)
{
baseMethod = minfo; // 'baseMethod' is only used in error messages, and if it's null, we just use the closest alternative we have (minfo).
}
if (delegateProxyType == null)
{
throw ErrorHelper.CreateError(8012, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: DelegateType is null. Please file a bug at https://github.com/xamarin/xamarin-macios/issues/new.", baseMethod.DeclaringType.FullName, baseMethod.Name);
}
var delegateProxyField = delegateProxyType.GetField("Handler", BindingFlags.NonPublic | BindingFlags.Static);
if (delegateProxyField == null)
{
throw ErrorHelper.CreateError(8013, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: DelegateType ({2}) specifies a type without a 'Handler' field. Please file a bug at https://github.com/xamarin/xamarin-macios/issues/new.", baseMethod.DeclaringType.FullName, baseMethod.Name, delegateProxyType.FullName);
}
var handlerDelegate = delegateProxyField.GetValue(null);
if (handlerDelegate == null)
{
throw ErrorHelper.CreateError(8014, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: The DelegateType's ({2}) 'Handler' field is null. Please file a bug at https://github.com/xamarin/xamarin-macios/issues/new.", baseMethod.DeclaringType.FullName, baseMethod.Name, delegateProxyType.FullName);
}
if (!(handlerDelegate is Delegate))
{
throw ErrorHelper.CreateError(8015, "Invalid DelegateProxyAttribute for the return value for the method {0}.{1}: The DelegateType's ({2}) 'Handler' field is not a delegate, it's a {3}. Please file a bug at https://github.com/xamarin/xamarin-macios/issues/new.", baseMethod.DeclaringType.FullName, baseMethod.Name, delegateProxyType.FullName, handlerDelegate.GetType().FullName);
}
// We now have the information we need to create the block.
// Note that we must create a heap-allocated block, so we
// start off by creating a stack-allocated block, and then
// call _Block_copy, which will create a heap-allocated block
// with the proper reference count.
BlockLiteral block = new BlockLiteral();
if (signature == null)
{
if (Runtime.DynamicRegistrationSupported)
{
block.SetupBlock((Delegate)handlerDelegate, (Delegate)@delegate);
}
else
{
throw ErrorHelper.CreateError(8026, $"BlockLiteral.GetBlockForDelegate with a null signature is not supported when the dynamic registrar has been linked away (delegate type: {@delegate.GetType ().FullName}).");
}
}
else
{
block.SetupBlockImpl((Delegate)handlerDelegate, (Delegate)@delegate, true, signature);
}
var rv = _Block_copy(ref block);
block.CleanupBlock();
return(rv);
}
// Return value: NULL or a MonoObject* that must be released with xamarin_mono_object_safe_release.
// Any MonoObject* ref parameters must also be retained and must be released with xamarin_mono_object_release.
static object InvokeMethod(MethodBase method, object instance, IntPtr native_parameters)
{
var methodParameters = method.GetParameters();
var parameters = new object [methodParameters.Length];
var inputParameters = new object [methodParameters.Length];
var nativeParameters = new IntPtr [methodParameters.Length];
// Copy native array of void* to managed array of IntPtr to make the subsequent code simpler.
unsafe {
IntPtr *nativeParams = (IntPtr *)native_parameters;
for (var i = 0; i < methodParameters.Length; i++)
{
nativeParameters [i] = nativeParams [i];
}
}
// Log our input
log_coreclr($"InvokeMethod ({method.DeclaringType.FullName}::{method}, {instance}, 0x{native_parameters.ToString ("x")})");
for (var i = 0; i < methodParameters.Length; i++)
{
var nativeParam = nativeParameters [i];
var p = methodParameters [i];
var paramType = p.ParameterType;
if (paramType.IsByRef)
{
paramType = paramType.GetElementType();
}
log_coreclr($" Argument #{i + 1}: Type = {p.ParameterType.FullName} IsByRef: {p.ParameterType.IsByRef} IsOut: {p.IsOut} IsClass: {paramType.IsClass} IsInterface: {paramType.IsInterface} NativeParameter: 0x{nativeParam.ToString ("x")}");
}
// Process the arguments, and convert to what MethodBase.Invoke expects
for (var i = 0; i < methodParameters.Length; i++)
{
var nativeParam = nativeParameters [i];
var p = methodParameters [i];
var paramType = p.ParameterType;
var isByRef = paramType.IsByRef;
if (isByRef)
{
paramType = paramType.GetElementType();
}
log_coreclr($" Marshalling #{i + 1}: IntPtr => 0x{nativeParam.ToString ("x")} => {p.ParameterType.FullName} [...]");
if (paramType == typeof(IntPtr))
{
log_coreclr($" IntPtr");
if (isByRef)
{
if (p.IsOut)
{
parameters [i] = Marshal.AllocHGlobal(IntPtr.Size);
}
else
{
parameters [i] = nativeParam == IntPtr.Zero ? IntPtr.Zero : Marshal.ReadIntPtr(nativeParam);
}
}
else
{
parameters [i] = nativeParam == IntPtr.Zero ? IntPtr.Zero : Marshal.ReadIntPtr(nativeParam);
}
log_coreclr($" => 0x{((IntPtr) parameters [i]).ToString ("x")}");
}
else if (paramType.IsClass || paramType.IsInterface || (paramType.IsValueType && IsNullable(paramType)))
{
log_coreclr($" IsClass/IsInterface/IsNullable IsByRef: {isByRef} IsOut: {p.IsOut} ParameterType: {paramType}");
if (nativeParam != IntPtr.Zero)
{
unsafe {
MonoObject *mono_obj = (MonoObject *)nativeParam;
// dereference if it's a byref type
if (isByRef)
{
mono_obj = *(MonoObject **)mono_obj;
}
// get the object
parameters [i] = GetMonoObjectTarget(mono_obj);
}
}
log_coreclr($" => {(parameters [i] == null ? "<null>" : parameters [i].GetType ().FullName)}");
}
else if (paramType.IsValueType)
{
log_coreclr($" IsValueType IsByRef: {isByRef} IsOut: {p.IsOut} nativeParam: 0x{nativeParam.ToString ("x")} ParameterType: {paramType}");
if (nativeParam != IntPtr.Zero)
{
// We need to unwrap nullable types and enum types to their underlying struct type.
var structType = paramType;
Type enumType = null;
if (IsNullable(structType))
{
structType = Nullable.GetUnderlyingType(structType);
}
if (structType.IsEnum)
{
enumType = structType;
structType = Enum.GetUnderlyingType(structType);
}
// convert the pointer to the corresponding structure
var vt = PtrToStructure(nativeParam, structType);
// convert the structure to the enum type if that's what we need
if (enumType != null)
{
vt = Enum.ToObject(enumType, vt);
}
parameters [i] = vt;
}
log_coreclr($" => {(parameters [i] == null ? "<null>" : parameters [i].ToString ())}");
}
else
{
throw ErrorHelper.CreateError(8037, Errors.MX8037 /* Don't know how to marshal the parameter of type {p.ParameterType.FullName} for parameter {p.Name} in call to {method} */, p.ParameterType.FullName, p.Name, method);
}
}
// Make a copy of the array of parameters, so that we can figure out if there were any ref parameters that the method modified.
parameters.CopyTo(inputParameters, 0);
// Call the actual method
log_coreclr($" Invoking...");
object rv = null;
try {
rv = method.Invoke(instance, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance, null, parameters, null);
} catch (TargetInvocationException tie) {
var ex = tie.InnerException ?? tie;
// This will re-throw the original exception and preserve the stacktrace.
ExceptionDispatchInfo.Capture(ex).Throw();
}
// Copy any byref parameters back out again
var byrefParameterCount = 0;
for (var i = 0; i < methodParameters.Length; i++)
{
var p = methodParameters [i];
if (!p.IsOut && !p.ParameterType.IsByRef)
{
continue;
}
byrefParameterCount++;
log_coreclr($" Marshalling #{i + 1} back (Type: {p.ParameterType.FullName}) value: {(parameters [i] == null ? "<null>" : parameters [i].GetType ().FullName)}");
var parameterType = p.ParameterType.GetElementType();
var isMonoObject = parameterType.IsClass || parameterType.IsInterface || (parameterType.IsValueType && IsNullable(parameterType));
var nativeParam = nativeParameters [i];
if (nativeParam == IntPtr.Zero)
{
log_coreclr($" No output pointer was provided.");
continue;
}
if (parameters [i] == inputParameters [i])
{
log_coreclr($" The argument didn't change, no marshalling required");
if (parameters [i] != null && parameterType != typeof(IntPtr) && isMonoObject)
{
// byref parameters must be retained
xamarin_mono_object_retain(Marshal.ReadIntPtr(nativeParam));
}
continue;
}
if (parameterType == typeof(IntPtr))
{
Marshal.WriteIntPtr(nativeParam, (IntPtr)parameters [i]);
log_coreclr($" IntPtr: 0x{((IntPtr) parameters [i]).ToString ("x")} => Type: {parameters [i]?.GetType ()} nativeParam: 0x{nativeParam.ToString ("x")}");
}
else if (isMonoObject)
{
var ptr = GetMonoObject(parameters [i]);
Marshal.WriteIntPtr(nativeParam, ptr);
log_coreclr($" IsClass/IsInterface/IsNullable: {(parameters [i] == null ? "<null>" : parameters [i].GetType ().FullName)} nativeParam: 0x{nativeParam.ToString ("x")} -> MonoObject: 0x{ptr.ToString ("x")}");
}
else if (parameterType.IsValueType)
{
StructureToPtr(parameters [i], nativeParam);
log_coreclr($" IsValueType: {(parameters [i] == null ? "<null>" : parameters [i].ToString ())} nativeParam: 0x{nativeParam.ToString ("x")}");
}
else
{
throw ErrorHelper.CreateError(8038, Errors.MX8038 /* Don't know how to marshal back the parameter of type {p.ParameterType.FullName} for parameter {p.Name} in call to {method} */, p.ParameterType.FullName, p.Name, method);
}
}
// we're done!
log_coreclr($" Invoke complete with {byrefParameterCount} ref parameters and return value of type {rv?.GetType ()}");
return(rv);
}