Fixed enum boxing decompilation bug. Enum in attributes better printing.

ICSharpCode.Decompiler/Ast/AstBuilder.cs

@@ -6,8 +6,10 @@ using System.Threading;
 using Decompiler.Transforms;
 using ICSharpCode.Decompiler;
 using ICSharpCode.NRefactory.CSharp;
+using ICSharpCode.NRefactory.Utils;
 using Mono.Cecil;
 using Mono.Cecil.Cil;
+using Ast = ICSharpCode.NRefactory.CSharp;
 using ClassType = ICSharpCode.NRefactory.TypeSystem.ClassType;
 using VarianceModifier = ICSharpCode.NRefactory.TypeSystem.VarianceModifier;
 
@@ -583,7 +585,17 @@ namespace Decompiler
 
 					foreach (var parameter in customAttribute.ConstructorArguments)
 					{
-						attribute.Arguments.Add(new PrimitiveExpression(parameter.Value));
+						var isEnum = parameter.Type.IsValueType && !parameter.Type.IsPrimitive;
+						Expression parameterValue;
+						if (isEnum)
+						{
+							parameterValue = MakePrimitive(Convert.ToInt64(parameter.Value), parameter.Type);
+						}
+						else
+						{
+							parameterValue = new PrimitiveExpression(parameter.Value);
+						}
+						attribute.Arguments.Add(parameterValue);
 					}
 
 				}
@@ -591,5 +603,62 @@ namespace Decompiler
 				attributedNode.Attributes.Add(section);
 			}
 		}
+
+
+		internal static Expression MakePrimitive(long val, TypeReference type)
+		{
+			if (TypeAnalysis.IsBoolean(type) && val == 0)
+				return new Ast.PrimitiveExpression(false);
+			else if (TypeAnalysis.IsBoolean(type) && val == 1)
+				return new Ast.PrimitiveExpression(true);
+			if (type != null)
+			{ // cannot rely on type.IsValueType, it's not set for typerefs (but is set for typespecs)
+				TypeDefinition enumDefinition = type.Resolve();
+				if (enumDefinition != null && enumDefinition.IsEnum)
+				{
+					foreach (FieldDefinition field in enumDefinition.Fields)
+					{
+						if (field.IsStatic && object.Equals(CSharpPrimitiveCast.Cast(TypeCode.Int64, field.Constant, false), val))
+							return AstBuilder.ConvertType(enumDefinition).Member(field.Name).WithAnnotation(field);
+						else if (!field.IsStatic && field.IsRuntimeSpecialName)
+							type = field.FieldType; // use primitive type of the enum
+					}
+					if (IsFlagsEnum(enumDefinition))
+					{
+						Expression expr = null;
+						foreach (FieldDefinition field in enumDefinition.Fields.Where(fld => fld.IsStatic))
+						{
+							long fieldValue = (long)CSharpPrimitiveCast.Cast(TypeCode.Int64, field.Constant, false);
+							if (fieldValue == 0)
+								continue;	// skip None enum value
+
+							if ((fieldValue & val) == fieldValue)
+							{
+								var fieldExpression = AstBuilder.ConvertType(enumDefinition).Member(field.Name).WithAnnotation(field);
+								if (expr == null)
+									expr = fieldExpression;
+								else
+									expr = new BinaryOperatorExpression(expr, BinaryOperatorType.BitwiseOr, fieldExpression);
+							}
+						}
+						if (expr != null)
+							return expr;
+					}
+				}
+			}
+			TypeCode code = TypeAnalysis.GetTypeCode(type);
+			if (code == TypeCode.Object)
+				return new Ast.PrimitiveExpression((int)val);
+			else
+				return new Ast.PrimitiveExpression(CSharpPrimitiveCast.Cast(code, val, false));
+		}
+
+		static bool IsFlagsEnum(TypeDefinition type)
+		{
+			if (!type.HasCustomAttributes)
+				return false;
+
+			return type.CustomAttributes.Any(attr => attr.AttributeType.FullName == "System.FlagsAttribute");
+		}
 	}
 }

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -514,7 +514,7 @@ namespace Decompiler
 						return MakeRef(new Ast.IdentifierExpression(((ParameterDefinition)operand).Name).WithAnnotation(operand));
 					}
 				case Code.Ldc_I4:
-					return MakePrimitive((int)operand, byteCode.InferredType);
+					return AstBuilder.MakePrimitive((int)operand, byteCode.InferredType);
 				case Code.Ldc_I8:
 				case Code.Ldc_R4:
 				case Code.Ldc_R8:
@@ -763,7 +763,7 @@ namespace Decompiler
 					if (TypeAnalysis.IsBoolean(actualType))
 						return expr;
 					if (actualIsIntegerOrEnum) {
-						return new BinaryOperatorExpression(expr, BinaryOperatorType.InEquality, MakePrimitive(0, actualType));
+						return new BinaryOperatorExpression(expr, BinaryOperatorType.InEquality, AstBuilder.MakePrimitive(0, actualType));
 					} else {
 						return new BinaryOperatorExpression(expr, BinaryOperatorType.InEquality, new NullReferenceExpression());
 					}
@@ -771,39 +771,21 @@ namespace Decompiler
 				if (TypeAnalysis.IsBoolean(actualType) && requiredIsIntegerOrEnum) {
 					return new ConditionalExpression {
 						Condition = expr,
-						TrueExpression = MakePrimitive(1, reqType),
-						FalseExpression = MakePrimitive(0, reqType)
+						TrueExpression = AstBuilder.MakePrimitive(1, reqType),
+						FalseExpression = AstBuilder.MakePrimitive(0, reqType)
 					};
 				}
+
+				if (expr is PrimitiveExpression && !requiredIsIntegerOrEnum && TypeAnalysis.IsEnum(actualType))
+				{
+					return expr.CastTo(AstBuilder.ConvertType(actualType));
+				}
+
 				if (actualIsIntegerOrEnum && requiredIsIntegerOrEnum) {
 					return expr.CastTo(AstBuilder.ConvertType(reqType));
 				}
 				return expr;
 			}
 		}
-		
-		Expression MakePrimitive(long val, TypeReference type)
-		{
-			if (TypeAnalysis.IsBoolean(type) && val == 0)
-				return new Ast.PrimitiveExpression(false);
-			else if (TypeAnalysis.IsBoolean(type) && val == 1)
-				return new Ast.PrimitiveExpression(true);
-			if (type != null) { // cannot rely on type.IsValueType, it's not set for typerefs (but is set for typespecs)
-				TypeDefinition enumDefinition = type.Resolve();
-				if (enumDefinition != null && enumDefinition.IsEnum) {
-					foreach (FieldDefinition field in enumDefinition.Fields) {
-						if (field.IsStatic && object.Equals(CSharpPrimitiveCast.Cast(TypeCode.Int64, field.Constant, false), val))
-							return AstBuilder.ConvertType(enumDefinition).Member(field.Name).WithAnnotation(field);
-						else if (!field.IsStatic && field.IsRuntimeSpecialName)
-							type = field.FieldType; // use primitive type of the enum
-					}
-				}
-			}
-			TypeCode code = TypeAnalysis.GetTypeCode(type);
-			if (code == TypeCode.Object)
-				return new Ast.PrimitiveExpression((int)val);
-			else
-				return new Ast.PrimitiveExpression(CSharpPrimitiveCast.Cast(code, val, false));
-		}
 	}
 }

ICSharpCode.Decompiler/ILAst/TypeAnalysis.cs

@@ -627,6 +627,15 @@ namespace Decompiler
 		{
 			return IsSigned(type) != null;
 		}
+
+		public static bool IsEnum(TypeReference type)
+		{
+			if (type == null)
+				return false;
+			// unfortunately we cannot rely on type.IsValueType here - it's not set when the instruction operand is a typeref (as opposed to a typespec)
+			TypeDefinition typeDef = type.Resolve() as TypeDefinition;
+			return typeDef != null && typeDef.IsEnum;
+		}
 		
 		static bool? IsSigned(TypeReference type)
 		{

ICSharpCode.Decompiler/Tests/CustomAttributes.cs

@@ -12,8 +12,16 @@ public static class CustomAtributes
 //		Item1,
 		Item2
 	}
+	[AttributeUsage(AttributeTargets.All)]
+	public class MyAttribute : Attribute
+	{
+	}
 	[Obsolete("some message")]
 	public static void ObsoletedMethod()
 	{
+		//Console.WriteLine("{0} $$$ {1}", AttributeTargets.Interface, (AttributeTargets)(AttributeTargets.Property | AttributeTargets.Field));
+		Console.WriteLine("{0} $$$ {1}", AttributeTargets.Interface, AttributeTargets.Property | AttributeTargets.Field);
+		AttributeTargets attributeTargets = AttributeTargets.Property | AttributeTargets.Field;
+		Console.WriteLine("{0} $$$ {1}", AttributeTargets.Interface, attributeTargets);
 	}
 }