Port DelegateConstruction and TransformArrayInitializers

ICSharpCode.Decompiler/IL/Transforms/DelegateConstruction.cs

@@ -19,6 +19,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection.Metadata;
 using ICSharpCode.Decompiler.CSharp;
 using ICSharpCode.Decompiler.TypeSystem;
 
@@ -137,13 +138,16 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 			if (!IsAnonymousMethod(decompilationContext.CurrentTypeDefinition, targetMethod))
 				return null;
 			target = value.Arguments[0];
-			var methodDefinition = (Mono.Cecil.MethodDefinition)context.TypeSystem.GetCecil(targetMethod);
-			if (methodDefinition == null)
+			if (targetMethod.MetadataToken.IsNil)
+				return null;
+			var metadata = context.TypeSystem.GetMetadata();
+			var methodDefinition = metadata.GetMethodDefinition((MethodDefinitionHandle)targetMethod.MetadataToken);
+			if (!methodDefinition.HasBody())
 				return null;
 			var localTypeSystem = context.TypeSystem.GetSpecializingTypeSystem(targetMethod.Substitution);
 			var ilReader = new ILReader(localTypeSystem);
 			ilReader.UseDebugSymbols = context.Settings.UseDebugSymbols;
-			var function = ilReader.ReadIL(methodDefinition.Body, context.CancellationToken);
+			var function = ilReader.ReadIL(context.TypeSystem.ModuleDefinition, (MethodDefinitionHandle)targetMethod.MetadataToken, context.TypeSystem.ModuleDefinition.Reader.GetMethodBody(methodDefinition.RelativeVirtualAddress), context.CancellationToken);
 			function.DelegateType = value.Method.DeclaringType;
 			function.CheckInvariant(ILPhase.Normal);
 

ICSharpCode.Decompiler/IL/Transforms/TransformArrayInitializers.cs

@@ -319,11 +319,11 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 			return true;
 		}
 		
-		bool MatchInitializeArrayCall(ILInstruction instruction, out IMethod method, out ILVariable array, out Mono.Cecil.FieldReference field)
+		bool MatchInitializeArrayCall(ILInstruction instruction, out IMethod method, out ILVariable array, out System.Reflection.Metadata.FieldDefinition field)
 		{
 			method = null;
 			array = null;
-			field = null;
+			field = default;
 			Call call = instruction as Call;
 			if (call == null || call.Arguments.Count != 2)
 				return false;
@@ -337,22 +337,18 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 			IMember member;
 			if (!call.Arguments[1].MatchLdMemberToken(out member))
 				return false;
-			field = context.TypeSystem.GetCecil(member) as Mono.Cecil.FieldReference;
-			if (field == null)
+			if (member.MetadataToken.IsNil)
 				return false;
+			field = context.TypeSystem.GetMetadata().GetFieldDefinition((System.Reflection.Metadata.FieldDefinitionHandle)member.MetadataToken);
 			return true;
 		}
 
 		bool ForwardScanInitializeArrayRuntimeHelper(Block body, int pos, ILVariable array, IType arrayType, int[] arrayLength, out ILInstruction[] values, out int foundPos)
 		{
-			ILVariable v2;
-			IMethod method;
-			Mono.Cecil.FieldReference field;
-			if (MatchInitializeArrayCall(body.Instructions[pos], out method, out v2, out field) && array == v2) {
-				var fieldDef = field.ResolveWithinSameModule();
-				if (fieldDef != null && fieldDef.InitialValue != null) {
+			if (MatchInitializeArrayCall(body.Instructions[pos], out var method, out var v2, out var field) && array == v2) {
+				if (field.HasFlag(System.Reflection.FieldAttributes.HasFieldRVA)) {
 					var valuesList = new List<ILInstruction>();
-					if (DecodeArrayInitializer(arrayType, array, fieldDef.InitialValue, arrayLength, valuesList)) {
+					if (DecodeArrayInitializer(arrayType, array, field.GetInitialValue(context.TypeSystem.ModuleDefinition.Reader), arrayLength, valuesList)) {
 						values = valuesList.ToArray();
 						foundPos = pos;
 						return true;