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Imported Upstream version 5.20.0.180
Former-commit-id: ff953ca879339fe1e1211f7220f563e1342e66cb
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0510252385
@@ -1897,5 +1897,72 @@ namespace System.Runtime.InteropServices
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throw new NotSupportedException();
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}
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#endif
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internal class MarshalerInstanceKeyComparer : IEqualityComparer<(Type, string)> {
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public bool Equals ((Type, string) lhs, (Type, string) rhs) {
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return lhs.CompareTo(rhs) == 0;
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}
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public int GetHashCode ((Type, string) key) {
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return key.GetHashCode ();
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}
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}
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internal static Dictionary<(Type, string), ICustomMarshaler> MarshalerInstanceCache;
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internal static readonly object MarshalerInstanceCacheLock = new object ();
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internal static ICustomMarshaler GetCustomMarshalerInstance (Type type, string cookie) {
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var key = (type, cookie);
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LazyInitializer.EnsureInitialized (
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ref MarshalerInstanceCache,
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() => new Dictionary<(Type, string), ICustomMarshaler> (new MarshalerInstanceKeyComparer ())
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);
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ICustomMarshaler result;
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bool gotExistingInstance;
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lock (MarshalerInstanceCacheLock)
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gotExistingInstance = MarshalerInstanceCache.TryGetValue (key, out result);
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if (!gotExistingInstance) {
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MonoMethod getInstanceMethod;
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try {
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getInstanceMethod = (MonoMethod)type.GetMethod (
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"GetInstance", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.InvokeMethod,
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null, new Type[] { typeof(string) }, null
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);
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} catch (AmbiguousMatchException) {
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throw new ApplicationException ($"Custom marshaler '{type.FullName}' implements multiple static GetInstance methods that take a single string parameter.");
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}
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if ((getInstanceMethod == null) ||
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(getInstanceMethod.ReturnType != typeof (ICustomMarshaler))) {
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throw new ApplicationException ($"Custom marshaler '{type.FullName}' does not implement a static GetInstance method that takes a single string parameter and returns an ICustomMarshaler.");
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}
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Exception exc;
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try {
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result = (ICustomMarshaler)getInstanceMethod.InternalInvoke (null, new object[] { cookie }, out exc);
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} catch (Exception e) {
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// FIXME: mscorlib's legacyUnhandledExceptionPolicy is apparently 1,
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// so exceptions are thrown instead of being passed through the outparam
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exc = e;
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result = null;
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}
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if (exc != null) {
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var edi = System.Runtime.ExceptionServices.ExceptionDispatchInfo.Capture (exc);
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edi.Throw ();
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}
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if (result == null)
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throw new ApplicationException ($"A call to GetInstance() for custom marshaler '{type.FullName}' returned null, which is not allowed.");
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lock (MarshalerInstanceCacheLock)
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MarshalerInstanceCache[key] = result;
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}
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return result;
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}
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}
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}
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