Handle cpobj instruction as stobj(ldobj).

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -485,9 +485,12 @@ namespace ICSharpCode.Decompiler.Ast
 						return arg1;
 					else
 						return arg1.CastTo(operandAsTypeRef);
-					case ILCode.Isinst:         return arg1.CastAs(operandAsTypeRef);
-					case ILCode.Box:            return arg1;
-					case ILCode.Unbox:          return InlineAssembly(byteCode, args);
+				case ILCode.Isinst:
+					return arg1.CastAs(operandAsTypeRef);
+				case ILCode.Box:
+					return arg1;
+				case ILCode.Unbox:
+					return MakeRef(arg1.CastTo(operandAsTypeRef));
 					#endregion
 					#region Indirect
 				case ILCode.Ldind_Ref:
@@ -539,11 +542,7 @@ namespace ICSharpCode.Decompiler.Ast
 					case ILCode.Endfilter:   return InlineAssembly(byteCode, args);
 					case ILCode.Endfinally:  return null;
 					case ILCode.Initblk:     return InlineAssembly(byteCode, args);
-				case ILCode.Initobj:
-					if (args[0] is DirectionExpression)
-						return new AssignmentExpression(((DirectionExpression)args[0]).Expression.Detach(), MakeDefaultValue((TypeReference)operand));
-					else
-						return InlineAssembly(byteCode, args);
+					case ILCode.Initobj:      return InlineAssembly(byteCode, args);
 				case ILCode.DefaultValue:
 					return MakeDefaultValue((TypeReference)operand);
 					case ILCode.Jmp: return InlineAssembly(byteCode, args);

ICSharpCode.Decompiler/ILAst/PeepholeTransform.cs

@@ -90,6 +90,10 @@ namespace ICSharpCode.Decompiler.ILAst
 				expr.Code = ILCode.Stobj;
 				expr.Arguments.Add(new ILExpression(ILCode.DefaultValue, expr.Operand));
 				modified = true;
+			} else if (expr.Code == ILCode.Cpobj) {
+				expr.Code = ILCode.Stobj;
+				expr.Arguments[1] = new ILExpression(ILCode.Ldobj, expr.Operand, expr.Arguments[1]);
+				modified = true;
 			}
 			ILExpression arg, arg2;
 			TypeReference type;