-// -*- coding: dos -*-\r
-//\r
-// attribute.cs: Attribute Handler\r
-//\r
-// Author: Ravi Pratap (ravi@ximian.com)\r
-//\r
-// Licensed under the terms of the GNU GPL\r
-//\r
-// (C) 2001 Ximian, Inc (http://www.ximian.com)\r
-//\r
-//\r
-\r
-using System;\r
-using System.Diagnostics;\r
-using System.Collections;\r
-using System.Reflection;\r
-using System.Reflection.Emit;\r
-using System.Runtime.InteropServices;\r
-using System.Runtime.CompilerServices;\r
-using System.Text;\r
-\r
-namespace Mono.CSharp {\r
- /// <summary>\r
- /// Base class for objects that can have Attributes applied to them.\r
- /// </summary>\r
- public abstract class Attributable {\r
- /// <summary>\r
- /// Attributes for this type\r
- /// </summary>\r
- Attributes attributes;\r
-\r
- public Attributable(Attributes attrs)\r
- {\r
- attributes = attrs;\r
- }\r
-\r
- public Attributes OptAttributes \r
- {\r
- get {\r
- return attributes;\r
- }\r
- set {\r
- attributes = value;\r
- }\r
- }\r
-\r
- /// <summary>\r
- /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder\r
- /// </summary>\r
- public abstract void ApplyAttributeBuilder (object builder, Attribute a, CustomAttributeBuilder cb);\r
- };\r
-\r
-\r
- public class Attribute {\r
- public readonly string Name;\r
- public readonly ArrayList Arguments;\r
-\r
- public readonly Location Location;\r
-\r
- public Type Type;\r
- \r
- //\r
- // The following are only meaningful when the attribute\r
- // being emitted is an AttributeUsage attribute\r
- //\r
- public AttributeTargets Targets;\r
- public bool AllowMultiple;\r
- public bool Inherited;\r
-\r
- bool usage_attr = false;\r
- \r
- public bool UsageAttr {\r
- get { return usage_attr; }\r
- }\r
-\r
- MethodImplOptions ImplOptions;\r
- UnmanagedType UnmanagedType;\r
- CustomAttributeBuilder cb;\r
- \r
- // non-null if named args present after Resolve () is called\r
- PropertyInfo [] prop_info_arr;\r
- FieldInfo [] field_info_arr;\r
- object [] field_values_arr;\r
- object [] prop_values_arr;\r
- \r
- object [] pos_values;\r
-\r
- public Attribute (string name, ArrayList args, Location loc)\r
- {\r
- Name = name;\r
- Arguments = args;\r
- Location = loc;\r
- }\r
-\r
- void Error_InvalidNamedArgument (string name)\r
- {\r
- Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +\r
- "argument. Named attribute arguments must be fields which are not " +\r
- "readonly, static or const, or properties with a set accessor which "+\r
- "are not static.");\r
- }\r
-\r
- static void Error_AttributeArgumentNotValid (Location loc)\r
- {\r
- Report.Error (182, loc,\r
- "An attribute argument must be a constant expression, typeof " +\r
- "expression or array creation expression");\r
- }\r
-\r
- static void Error_AttributeConstructorMismatch (Location loc)\r
- {\r
- Report.Error (-6, loc,\r
- "Could not find a constructor for this argument list.");\r
- }\r
-\r
- static void Error_TypeParameterInAttribute (Location loc)\r
- {\r
- Report.Error (\r
- -202, loc, "Can not use a type parameter in an attribute");\r
- }\r
-\r
- /// <summary>\r
- /// Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.\r
- /// </summary>\r
- private Type CheckAttributeType (EmitContext ec, bool complain) {\r
- TypeExpr t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);\r
- // FIXME: Shouldn't do this for quoted attributes: [@A]\r
- TypeExpr t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);\r
-\r
- String err0616 = null;\r
- if (t1 != null && ! t1.IsAttribute) {\r
- t1 = null;\r
- err0616 = "'" + Name + "': is not an attribute class";\r
- }\r
- if (t2 != null && ! t2.IsAttribute) {\r
- t2 = null;\r
- err0616 = (err0616 != null) \r
- ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"\r
- : "'" + Name + "Attribute': is not an attribute class";\r
- }\r
-\r
- if (t1 != null && t2 != null) {\r
- Report.Error(1614, Location, "'" + Name + "': is ambiguous; " \r
- + " use either '@" + Name + "' or '" + Name + "Attribute'");\r
- return null;\r
- }\r
-\r
- if (t1 != null)\r
- return t1.ResolveType (ec);\r
- if (t2 != null)\r
- return t2.ResolveType (ec);\r
- if (err0616 != null) {\r
- Report.Error (616, Location, err0616);\r
- return null;\r
- }\r
- if (complain)\r
- Report.Error (\r
- 246, Location, "Could not find attribute '" + Name + "' (are you" +\r
- " missing a using directive or an assembly reference ?)");\r
- return null;\r
- }\r
-\r
- public Type ResolveType (EmitContext ec, bool complain)\r
- {\r
- if (Type == null)\r
- Type = CheckAttributeType (ec, complain);\r
- return Type;\r
- }\r
-\r
- /// <summary>\r
- /// Validates the guid string\r
- /// </summary>\r
- bool ValidateGuid (string guid)\r
- {\r
- try {\r
- new Guid (guid);\r
- return true;\r
- } catch {\r
- Report.Error (647, Location, "Format of GUID is invalid: " + guid);\r
- return false;\r
- }\r
- }\r
-\r
- //\r
- // Given an expression, if the expression is a valid attribute-argument-expression\r
- // returns an object that can be used to encode it, or null on failure.\r
- //\r
- public static bool GetAttributeArgumentExpression (Expression e, Location loc, out object result)\r
- {\r
- if (e is Constant) {\r
- result = ((Constant) e).GetValue ();\r
- return true;\r
- } else if (e is TypeOf) {\r
- result = ((TypeOf) e).TypeArg;\r
- return true;\r
- } else if (e is ArrayCreation){\r
- result = ((ArrayCreation) e).EncodeAsAttribute ();\r
- if (result != null)\r
- return true;\r
- } else if (e is EmptyCast) {\r
- result = e;\r
- if (((EmptyCast) e).Child is Constant) {\r
- result = ((Constant) ((EmptyCast)e).Child).GetValue();\r
- }\r
- return true;\r
- }\r
-\r
- result = null;\r
- Error_AttributeArgumentNotValid (loc);\r
- return false;\r
- }\r
- \r
- public CustomAttributeBuilder Resolve (EmitContext ec)\r
- {\r
- Type oldType = Type;\r
-\r
- // Sanity check.\r
- Type = CheckAttributeType (ec, true);\r
- if (oldType == null && Type == null)\r
- return null;\r
- if (oldType != null && oldType != Type) {\r
- Report.Error (-6, Location,\r
- "Attribute {0} resolved to different types at different times: {1} vs. {2}",\r
- Name, oldType, Type);\r
- return null;\r
- }\r
-\r
- bool MethodImplAttr = false;\r
- bool MarshalAsAttr = false;\r
- bool GuidAttr = false;\r
- usage_attr = false;\r
-\r
- bool DoCompares = true;\r
-\r
- //\r
- // If we are a certain special attribute, we\r
- // set the information accordingly\r
- //\r
- \r
- if (Type == TypeManager.attribute_usage_type)\r
- usage_attr = true;\r
- else if (Type == TypeManager.methodimpl_attr_type)\r
- MethodImplAttr = true;\r
- else if (Type == TypeManager.marshal_as_attr_type)\r
- MarshalAsAttr = true;\r
- else if (Type == TypeManager.guid_attr_type)\r
- GuidAttr = true;\r
- else\r
- DoCompares = false;\r
-\r
- // Now we extract the positional and named arguments\r
- \r
- ArrayList pos_args = new ArrayList ();\r
- ArrayList named_args = new ArrayList ();\r
- int pos_arg_count = 0;\r
- \r
- if (Arguments != null) {\r
- pos_args = (ArrayList) Arguments [0];\r
- if (pos_args != null)\r
- pos_arg_count = pos_args.Count;\r
- if (Arguments.Count > 1)\r
- named_args = (ArrayList) Arguments [1];\r
- }\r
-\r
- pos_values = new object [pos_arg_count];\r
-\r
- //\r
- // First process positional arguments \r
- //\r
-\r
- int i;\r
- for (i = 0; i < pos_arg_count; i++) {\r
- Argument a = (Argument) pos_args [i];\r
- Expression e;\r
-\r
- if (!a.Resolve (ec, Location))\r
- return null;\r
-\r
- e = a.Expr;\r
-\r
- object val;\r
- if (!GetAttributeArgumentExpression (e, Location, out val))\r
- return null;\r
- \r
- pos_values [i] = val;\r
- if (DoCompares){\r
- if (UsageAttr)\r
- this.Targets = (AttributeTargets) pos_values [0];\r
- else if (MethodImplAttr)\r
- this.ImplOptions = (MethodImplOptions) pos_values [0];\r
- else if (GuidAttr){\r
- //\r
- // we will later check the validity of the type\r
- //\r
- if (pos_values [0] is string){\r
- if (!ValidateGuid ((string) pos_values [0]))\r
- return null;\r
- }\r
- \r
- } else if (MarshalAsAttr)\r
- this.UnmanagedType =\r
- (System.Runtime.InteropServices.UnmanagedType) pos_values [0];\r
- }\r
- }\r
-\r
- //\r
- // Now process named arguments\r
- //\r
-\r
- ArrayList field_infos = null;\r
- ArrayList prop_infos = null;\r
- ArrayList field_values = null;\r
- ArrayList prop_values = null;\r
-\r
- Hashtable seen_names = new Hashtable();\r
-\r
- if (named_args.Count > 0) {\r
- field_infos = new ArrayList ();\r
- prop_infos = new ArrayList ();\r
- field_values = new ArrayList ();\r
- prop_values = new ArrayList ();\r
- }\r
- \r
- for (i = 0; i < named_args.Count; i++) {\r
- DictionaryEntry de = (DictionaryEntry) named_args [i];\r
- string member_name = (string) de.Key;\r
- Argument a = (Argument) de.Value;\r
- Expression e;\r
-\r
- if (seen_names.Contains(member_name)) {\r
- Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");\r
- return null;\r
- }\r
- seen_names.Add(member_name, 1);\r
-\r
- if (!a.Resolve (ec, Location))\r
- return null;\r
-\r
- Expression member = Expression.MemberLookup (\r
- ec, Type, member_name,\r
- MemberTypes.Field | MemberTypes.Property,\r
- BindingFlags.Public | BindingFlags.Instance,\r
- Location);\r
-\r
- if (member == null || !(member is PropertyExpr || member is FieldExpr)) {\r
- Error_InvalidNamedArgument (member_name);\r
- return null;\r
- }\r
-\r
- e = a.Expr;\r
- if (e is TypeParameterExpr){\r
- Error_TypeParameterInAttribute (Location);\r
- return null;\r
- }\r
- \r
- if (member is PropertyExpr) {\r
- PropertyExpr pe = (PropertyExpr) member;\r
- PropertyInfo pi = pe.PropertyInfo;\r
-\r
- if (!pi.CanWrite) {\r
- Error_InvalidNamedArgument (member_name);\r
- return null;\r
- }\r
-\r
- if (e is Constant) {\r
- Constant c;\r
-\r
- if (e.Type != pi.PropertyType){\r
- c = Const.ChangeType (Location, (Constant) e, pi.PropertyType);\r
- if (c == null)\r
- return null;\r
- } else\r
- c = (Constant) e;\r
-\r
- object o = c.GetValue ();\r
- prop_values.Add (o);\r
- \r
- if (UsageAttr) {\r
- if (member_name == "AllowMultiple")\r
- this.AllowMultiple = (bool) o;\r
- if (member_name == "Inherited")\r
- this.Inherited = (bool) o;\r
- }\r
- \r
- } else if (e is TypeOf) {\r
- prop_values.Add (((TypeOf) e).TypeArg);\r
- } else if (e is ArrayCreation) {\r
- prop_values.Add (((ArrayCreation) e).EncodeAsAttribute());\r
- } else {\r
- Error_AttributeArgumentNotValid (Location);\r
- return null;\r
- }\r
- \r
- prop_infos.Add (pi);\r
- \r
- } else if (member is FieldExpr) {\r
- FieldExpr fe = (FieldExpr) member;\r
- FieldInfo fi = fe.FieldInfo;\r
-\r
- if (fi.IsInitOnly) {\r
- Error_InvalidNamedArgument (member_name);\r
- return null;\r
- }\r
-\r
- //\r
- // Handle charset here, and set the TypeAttributes\r
- \r
- if (e is Constant){\r
- Constant c = (Constant) e;;\r
-\r
- if (c.Type != fi.FieldType){\r
- c = Const.ChangeType (Location, (Constant) e, fi.FieldType);\r
- if (c == null)\r
- return null;\r
- }\r
-\r
- object value = c.GetValue ();\r
- field_values.Add (value);\r
- } else if (e is TypeOf) {\r
- field_values.Add (((TypeOf) e).TypeArg);\r
- } else {\r
- Error_AttributeArgumentNotValid (Location);\r
- return null;\r
- }\r
- \r
- field_infos.Add (fi);\r
- }\r
- }\r
-\r
- Expression mg = Expression.MemberLookup (\r
- ec, Type, ".ctor", MemberTypes.Constructor,\r
- BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,\r
- Location);\r
-\r
- if (mg == null) {\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- MethodBase constructor = Invocation.OverloadResolve (\r
- ec, (MethodGroupExpr) mg, pos_args, false, Location);\r
-\r
- if (constructor == null) {\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- //\r
- // Now we perform some checks on the positional args as they\r
- // cannot be null for a constructor which expects a parameter\r
- // of type object\r
- //\r
-\r
- ParameterData pd = Invocation.GetParameterData (constructor);\r
-\r
- int group_in_params_array = Int32.MaxValue;\r
- int pc = pd.Count;\r
- if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)\r
- group_in_params_array = pc-1;\r
- \r
- for (int j = 0; j < pos_arg_count; ++j) {\r
- Argument a = (Argument) pos_args [j];\r
- \r
- if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {\r
- Error_AttributeArgumentNotValid (Location);\r
- return null;\r
- }\r
-\r
- if (j < group_in_params_array)\r
- continue;\r
- \r
- if (j == group_in_params_array){\r
- object v = pos_values [j];\r
- int count = pos_arg_count - j;\r
-\r
- object [] array = new object [count];\r
- pos_values [j] = array;\r
- array [0] = v;\r
- } else {\r
- object [] array = (object []) pos_values [group_in_params_array];\r
-\r
- array [j - group_in_params_array] = pos_values [j];\r
- }\r
- }\r
-\r
- //\r
- // Adjust the size of the pos_values if it had params\r
- //\r
- if (group_in_params_array != Int32.MaxValue){\r
- int argc = group_in_params_array+1;\r
- object [] new_pos_values = new object [argc];\r
-\r
- for (int p = 0; p < argc; p++)\r
- new_pos_values [p] = pos_values [p];\r
- pos_values = new_pos_values;\r
- }\r
-\r
- try {\r
- if (named_args.Count > 0) {\r
- prop_info_arr = new PropertyInfo [prop_infos.Count];\r
- field_info_arr = new FieldInfo [field_infos.Count];\r
- field_values_arr = new object [field_values.Count];\r
- prop_values_arr = new object [prop_values.Count];\r
-\r
- field_infos.CopyTo (field_info_arr, 0);\r
- field_values.CopyTo (field_values_arr, 0);\r
-\r
- prop_values.CopyTo (prop_values_arr, 0);\r
- prop_infos.CopyTo (prop_info_arr, 0);\r
-\r
- cb = new CustomAttributeBuilder (\r
- (ConstructorInfo) constructor, pos_values,\r
- prop_info_arr, prop_values_arr,\r
- field_info_arr, field_values_arr);\r
- }\r
- else\r
- cb = new CustomAttributeBuilder (\r
- (ConstructorInfo) constructor, pos_values);\r
- } catch (NullReferenceException) {\r
- // \r
- // Don't know what to do here\r
- //\r
- Report.Warning (\r
- -101, Location, "NullReferenceException while trying to create attribute." +\r
- "Something's wrong!");\r
- } catch (Exception e) {\r
- //\r
- // Sample:\r
- // using System.ComponentModel;\r
- // [DefaultValue (CollectionChangeAction.Add)]\r
- // class X { static void Main () {} }\r
- //\r
- Report.Warning (\r
- -23, Location,\r
- "The compiler can not encode this attribute in .NET due to\n" +\r
- "\ta bug in the .NET runtime. Try the Mono runtime.\nThe error was: " + e.Message);\r
- }\r
- \r
- return cb;\r
- }\r
-\r
- /// <summary>\r
- /// Get a string containing a list of valid targets for the attribute 'attr'\r
- /// </summary>\r
- static string GetValidTargets (Attribute attr)\r
- {\r
- StringBuilder sb = new StringBuilder ();\r
- AttributeTargets targets = 0;\r
- \r
- TypeContainer a = TypeManager.LookupAttr (attr.Type);\r
-\r
- if (a == null) {\r
- \r
- System.Attribute [] attrs = null;\r
- \r
- try {\r
- attrs = System.Attribute.GetCustomAttributes (attr.Type);\r
- \r
- } catch {\r
- Report.Error (-20, attr.Location, "Cannot find attribute type " + attr.Name +\r
- " (maybe you forgot to set the usage using the" +\r
- " AttributeUsage attribute ?).");\r
- return null;\r
- }\r
- \r
- foreach (System.Attribute tmp in attrs)\r
- if (tmp is AttributeUsageAttribute) {\r
- targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
- break;\r
- }\r
- } else\r
- targets = a.Targets;\r
-\r
- \r
- if ((targets & AttributeTargets.Assembly) != 0)\r
- sb.Append ("'assembly' ");\r
-\r
- if ((targets & AttributeTargets.Class) != 0)\r
- sb.Append ("'class' ");\r
-\r
- if ((targets & AttributeTargets.Constructor) != 0)\r
- sb.Append ("'constructor' ");\r
-\r
- if ((targets & AttributeTargets.Delegate) != 0)\r
- sb.Append ("'delegate' ");\r
-\r
- if ((targets & AttributeTargets.Enum) != 0)\r
- sb.Append ("'enum' ");\r
-\r
- if ((targets & AttributeTargets.Event) != 0)\r
- sb.Append ("'event' ");\r
-\r
- if ((targets & AttributeTargets.Field) != 0)\r
- sb.Append ("'field' ");\r
-\r
- if ((targets & AttributeTargets.Interface) != 0)\r
- sb.Append ("'interface' ");\r
-\r
- if ((targets & AttributeTargets.Method) != 0)\r
- sb.Append ("'method' ");\r
-\r
- if ((targets & AttributeTargets.Module) != 0)\r
- sb.Append ("'module' ");\r
-\r
- if ((targets & AttributeTargets.Parameter) != 0)\r
- sb.Append ("'parameter' ");\r
-\r
- if ((targets & AttributeTargets.Property) != 0)\r
- sb.Append ("'property' ");\r
-\r
- if ((targets & AttributeTargets.ReturnValue) != 0)\r
- sb.Append ("'return value' ");\r
-\r
- if ((targets & AttributeTargets.Struct) != 0)\r
- sb.Append ("'struct' ");\r
-\r
- return sb.ToString ();\r
-\r
- }\r
-\r
- public static void Error_AttributeNotValidForElement (Attribute a, Location loc)\r
- {\r
- Report.Error (\r
- 592, loc, "Attribute '" + a.Name +\r
- "' is not valid on this declaration type. " +\r
- "It is valid on " + GetValidTargets (a) + "declarations only.");\r
- }\r
-\r
- /// <summary>\r
- /// Ensure that Attribute 'a' is being applied to the right language element (target)\r
- /// </summary>\r
- public static bool CheckAttributeTarget (Attribute a, object element)\r
- {\r
- TypeContainer attr = TypeManager.LookupAttr (a.Type);\r
- AttributeTargets targets = 0;\r
-\r
- if (attr == null) {\r
- System.Attribute [] attrs = null;\r
- \r
- try {\r
- attrs = System.Attribute.GetCustomAttributes (a.Type);\r
-\r
- } catch {\r
- Report.Error (-20, a.Location, "Cannot find attribute type " + a.Name +\r
- " (maybe you forgot to set the usage using the" +\r
- " AttributeUsage attribute ?).");\r
- return false;\r
- }\r
- \r
- foreach (System.Attribute tmp in attrs)\r
- if (tmp is AttributeUsageAttribute) { \r
- targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
- break;\r
- }\r
- } else\r
- targets = attr.Targets;\r
-\r
- if (element is Class) return ((targets & AttributeTargets.Class) != 0);\r
- if (element is Struct) return ((targets & AttributeTargets.Struct) != 0);\r
- if (element is Constructor) return ((targets & AttributeTargets.Constructor) != 0);\r
- if (element is Delegate) return ((targets & AttributeTargets.Delegate) != 0);\r
- if (element is Enum) return ((targets & AttributeTargets.Enum) != 0);\r
- if (element is Event) return ((targets & AttributeTargets.Event) != 0);\r
- if (element is Field \r
- || element is FieldBuilder) return ((targets & AttributeTargets.Field) != 0);\r
- if (element is Interface) return ((targets & AttributeTargets.Interface) != 0);\r
- if (element is Method\r
- || element is Operator\r
- || element is Accessor) return ((targets & AttributeTargets.Method) != 0);\r
- if (element is ParameterBase) return ((targets & (AttributeTargets.Parameter \r
- | AttributeTargets.ReturnValue)) != 0);\r
- if (element is Property\r
- || element is Indexer\r
- || element is Accessor) return ((targets & AttributeTargets.Property) != 0);\r
- if (element is AssemblyClass) return ((targets & AttributeTargets.Assembly) != 0);\r
- if (element is ModuleClass) return ((targets & AttributeTargets.Module) != 0);\r
-\r
- return false;\r
- }\r
-\r
- //\r
- // This method should be invoked to pull the IndexerName attribute from an\r
- // Indexer if it exists.\r
- //\r
- public static string ScanForIndexerName (EmitContext ec, Attributes opt_attrs)\r
- {\r
- if (opt_attrs == null)\r
- return null;\r
- if (opt_attrs.AttributeSections == null)\r
- return null;\r
-\r
- foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
- if (asec.Attributes == null)\r
- continue;\r
-\r
- foreach (Attribute a in asec.Attributes){\r
- if (a.ResolveType (ec, true) == null)\r
- return null;\r
-\r
- if (a.Type != TypeManager.indexer_name_type)\r
- continue;\r
-\r
- //\r
- // So we have found an IndexerName, pull the data out.\r
- //\r
- if (a.Arguments == null || a.Arguments [0] == null){\r
- Error_AttributeConstructorMismatch (a.Location);\r
- return null;\r
- }\r
- ArrayList pos_args = (ArrayList) a.Arguments [0];\r
- if (pos_args.Count == 0){\r
- Error_AttributeConstructorMismatch (a.Location);\r
- return null;\r
- }\r
- \r
- Argument arg = (Argument) pos_args [0];\r
- if (!arg.Resolve (ec, a.Location))\r
- return null;\r
- \r
- Expression e = arg.Expr;\r
- if (!(e is StringConstant)){\r
- Error_AttributeConstructorMismatch (a.Location);\r
- return null;\r
- }\r
-\r
- //\r
- // Remove the attribute from the list\r
- //\r
- asec.Attributes.Remove (a);\r
-\r
- return (((StringConstant) e).Value);\r
- }\r
- }\r
- return null;\r
- }\r
-\r
- //\r
- // This pulls the condition name out of a Conditional attribute\r
- //\r
- public string Conditional_GetConditionName ()\r
- {\r
- //\r
- // So we have a Conditional, pull the data out.\r
- //\r
- if (Arguments == null || Arguments [0] == null){\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- ArrayList pos_args = (ArrayList) Arguments [0];\r
- if (pos_args.Count != 1){\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- Argument arg = (Argument) pos_args [0]; \r
- if (!(arg.Expr is StringConstant)){\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- return ((StringConstant) arg.Expr).Value;\r
- }\r
-\r
- //\r
- // This pulls the obsolete message and error flag out of an Obsolete attribute\r
- //\r
- public string Obsolete_GetObsoleteMessage (out bool is_error)\r
- {\r
- is_error = false;\r
- //\r
- // So we have an Obsolete, pull the data out.\r
- //\r
- if (Arguments == null || Arguments [0] == null)\r
- return "";\r
-\r
- ArrayList pos_args = (ArrayList) Arguments [0];\r
- if (pos_args.Count == 0)\r
- return "";\r
- else if (pos_args.Count > 2){\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- Argument arg = (Argument) pos_args [0]; \r
- if (!(arg.Expr is StringConstant)){\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
-\r
- if (pos_args.Count == 2){\r
- Argument arg2 = (Argument) pos_args [1];\r
- if (!(arg2.Expr is BoolConstant)){\r
- Error_AttributeConstructorMismatch (Location);\r
- return null;\r
- }\r
- is_error = ((BoolConstant) arg2.Expr).Value;\r
- }\r
-\r
- return ((StringConstant) arg.Expr).Value;\r
- }\r
-\r
- /// <summary>\r
- /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called\r
- /// before ApplyAttribute. We need to resolve the arguments.\r
- /// This situation occurs when class deps is differs from Emit order. \r
- /// </summary>\r
- public bool GetClsCompliantAttributeValue (DeclSpace ds)\r
- {\r
- if (pos_values == null) {\r
- EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);\r
-\r
- // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.\r
- // But because a lot of attribute class code must be rewritten will be better to wait...\r
+//
+// attribute.cs: Attribute Handler
+//
+// Author: Ravi Pratap (ravi@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
+//
+// Licensed under the terms of the GNU GPL
+//
+// (C) 2001 Ximian, Inc (http://www.ximian.com)
+//
+//
+
+using System;
+using System.Diagnostics;
+using System.Collections;
+using System.Collections.Specialized;
+using System.Reflection;
+using System.Reflection.Emit;
+using System.Runtime.InteropServices;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace Mono.CSharp {
+
+ /// <summary>
+ /// Base class for objects that can have Attributes applied to them.
+ /// </summary>
+ public abstract class Attributable {
+ /// <summary>
+ /// Attributes for this type
+ /// </summary>
+ Attributes attributes;
+
+ public Attributable(Attributes attrs)
+ {
+ attributes = attrs;
+ if (attributes != null)
+ attributes.CheckTargets (ValidAttributeTargets);
+ }
+
+ public Attributes OptAttributes
+ {
+ get {
+ return attributes;
+ }
+ set {
+ attributes = value;
+ if (attributes != null)
+ attributes.CheckTargets (ValidAttributeTargets);
+ }
+ }
+
+ /// <summary>
+ /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
+ /// </summary>
+ public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
+
+ /// <summary>
+ /// Returns combination of enabled AttributeTargets
+ /// </summary>
+ public abstract AttributeTargets AttributeTargets { get; }
+
+ public abstract bool IsClsCompliaceRequired (DeclSpace ds);
+
+ /// <summary>
+ /// Gets list of valid attribute targets for explicit target declaration.
+ /// The first array item is default target. Don't break this rule.
+ /// </summary>
+ protected abstract string[] ValidAttributeTargets { get; }
+ };
+
+ public class Attribute {
+ public string Target;
+ public readonly string Name;
+ public readonly ArrayList Arguments;
+
+ public readonly Location Location;
+
+ public Type Type;
+
+ // Is non-null if type is AttributeUsageAttribute
+ AttributeUsageAttribute usage_attribute;
+
+ public AttributeUsageAttribute UsageAttribute {
+ get {
+ return usage_attribute;
+ }
+ }
+
+ MethodImplOptions ImplOptions;
+ UnmanagedType UnmanagedType;
+ CustomAttributeBuilder cb;
+
+ // non-null if named args present after Resolve () is called
+ PropertyInfo [] prop_info_arr;
+ FieldInfo [] field_info_arr;
+ object [] field_values_arr;
+ object [] prop_values_arr;
+ object [] pos_values;
+
+ static PtrHashtable usage_attr_cache = new PtrHashtable ();
+
+ public Attribute (string target, string name, ArrayList args, Location loc)
+ {
+ Name = name;
+ Arguments = args;
+ Location = loc;
+ Target = target;
+ }
+
+ void Error_InvalidNamedArgument (string name)
+ {
+ Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +
+ "argument. Named attribute arguments must be fields which are not " +
+ "readonly, static or const, or properties with a set accessor which "+
+ "are not static.");
+ }
+
+ static void Error_AttributeArgumentNotValid (Location loc)
+ {
+ Report.Error (182, loc,
+ "An attribute argument must be a constant expression, typeof " +
+ "expression or array creation expression");
+ }
+
+ static void Error_TypeParameterInAttribute (Location loc)
+ {
+ Report.Error (
+ -202, loc, "Can not use a type parameter in an attribute");
+ }
+
+ void Error_AttributeConstructorMismatch ()
+ {
+ Report.Error (-6, Location,
+ "Could not find a constructor for this argument list.");
+ }
+
+ /// <summary>
+ /// Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
+ /// </summary>
+ protected virtual Type CheckAttributeType (EmitContext ec, bool complain)
+ {
+ TypeExpr t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);
+ // FIXME: Shouldn't do this for quoted attributes: [@A]
+ TypeExpr t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);
+
+ String err0616 = null;
+ if (t1 != null && ! t1.IsAttribute) {
+ t1 = null;
+ err0616 = "'" + Name + "': is not an attribute class";
+ }
+ if (t2 != null && ! t2.IsAttribute) {
+ t2 = null;
+ err0616 = (err0616 != null)
+ ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"
+ : "'" + Name + "Attribute': is not an attribute class";
+ }
+
+ if (t1 != null && t2 != null) {
+ Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
+ + " use either '@" + Name + "' or '" + Name + "Attribute'");
+ return null;
+ }
+ if (t1 != null)
+ return t1.ResolveType (ec);
+ if (t2 != null)
+ return t2.ResolveType (ec);
+ if (err0616 != null) {
+ Report.Error (616, Location, err0616);
+ return null;
+ }
+
+ if (complain)
+ Report.Error (246, Location,
+ "Could not find attribute '" + Name
+ + "' (are you missing a using directive or an assembly reference ?)");
+ return null;
+ }
+
+ public Type ResolveType (EmitContext ec, bool complain)
+ {
+ if (Type == null)
+ Type = CheckAttributeType (ec, complain);
+ return Type;
+ }
+
+ /// <summary>
+ /// Validates the guid string
+ /// </summary>
+ bool ValidateGuid (string guid)
+ {
+ try {
+ new Guid (guid);
+ return true;
+ } catch {
+ Report.Error (647, Location, "Format of GUID is invalid: " + guid);
+ return false;
+ }
+ }
+
+ string GetFullMemberName (string member)
+ {
+ return Type.FullName + '.' + member;
+ }
+
+ //
+ // Given an expression, if the expression is a valid attribute-argument-expression
+ // returns an object that can be used to encode it, or null on failure.
+ //
+ public static bool GetAttributeArgumentExpression (Expression e, Location loc, out object result)
+ {
+ if (e is Constant) {
+ result = ((Constant) e).GetValue ();
+ return true;
+ } else if (e is TypeOf) {
+ result = ((TypeOf) e).TypeArg;
+ return true;
+ } else if (e is ArrayCreation){
+ result = ((ArrayCreation) e).EncodeAsAttribute ();
+ if (result != null)
+ return true;
+ } else if (e is EmptyCast) {
+ result = e;
+ if (((EmptyCast) e).Child is Constant) {
+ result = ((Constant) ((EmptyCast)e).Child).GetValue();
+ }
+ return true;
+ }
+
+ result = null;
+ Error_AttributeArgumentNotValid (loc);
+ return false;
+ }
+
+ public CustomAttributeBuilder Resolve (EmitContext ec)
+ {
+ Type oldType = Type;
+
+ // Sanity check.
+ Type = CheckAttributeType (ec, true);
+ if (oldType == null && Type == null)
+ return null;
+ if (oldType != null && oldType != Type) {
+ Report.Error (-6, Location,
+ "Attribute {0} resolved to different types at different times: {1} vs. {2}",
+ Name, oldType, Type);
+ return null;
+ }
+
+ bool MethodImplAttr = false;
+ bool MarshalAsAttr = false;
+ bool GuidAttr = false;
+ bool usage_attr = false;
+
+ bool DoCompares = true;
+
+ //
+ // If we are a certain special attribute, we
+ // set the information accordingly
+ //
+
+ if (Type == TypeManager.attribute_usage_type)
+ usage_attr = true;
+ else if (Type == TypeManager.methodimpl_attr_type)
+ MethodImplAttr = true;
+ else if (Type == TypeManager.marshal_as_attr_type)
+ MarshalAsAttr = true;
+ else if (Type == TypeManager.guid_attr_type)
+ GuidAttr = true;
+ else
+ DoCompares = false;
+
+ // Now we extract the positional and named arguments
+
+ ArrayList pos_args = new ArrayList ();
+ ArrayList named_args = new ArrayList ();
+ int pos_arg_count = 0;
+
+ if (Arguments != null) {
+ pos_args = (ArrayList) Arguments [0];
+ if (pos_args != null)
+ pos_arg_count = pos_args.Count;
+ if (Arguments.Count > 1)
+ named_args = (ArrayList) Arguments [1];
+ }
+
+ pos_values = new object [pos_arg_count];
+
+ //
+ // First process positional arguments
+ //
+
+ int i;
+ for (i = 0; i < pos_arg_count; i++) {
+ Argument a = (Argument) pos_args [i];
+ Expression e;
+
+ if (!a.Resolve (ec, Location))
+ return null;
+
+ e = a.Expr;
+
+ object val;
+ if (!GetAttributeArgumentExpression (e, Location, out val))
+ return null;
+
+ pos_values [i] = val;
+ if (DoCompares){
+ if (usage_attr)
+ usage_attribute = new AttributeUsageAttribute ((AttributeTargets) pos_values [0]);
+ else if (MethodImplAttr)
+ this.ImplOptions = (MethodImplOptions) pos_values [0];
+ else if (GuidAttr){
+ //
+ // we will later check the validity of the type
+ //
+ if (pos_values [0] is string){
+ if (!ValidateGuid ((string) pos_values [0]))
+ return null;
+ }
+
+ } else if (MarshalAsAttr)
+ this.UnmanagedType =
+ (System.Runtime.InteropServices.UnmanagedType) pos_values [0];
+ }
+ }
+
+ //
+ // Now process named arguments
+ //
+
+ ArrayList field_infos = null;
+ ArrayList prop_infos = null;
+ ArrayList field_values = null;
+ ArrayList prop_values = null;
+
+ if (named_args.Count > 0) {
+ field_infos = new ArrayList ();
+ prop_infos = new ArrayList ();
+ field_values = new ArrayList ();
+ prop_values = new ArrayList ();
+ }
+
+ Hashtable seen_names = new Hashtable();
+
+ for (i = 0; i < named_args.Count; i++) {
+ DictionaryEntry de = (DictionaryEntry) named_args [i];
+ string member_name = (string) de.Key;
+ Argument a = (Argument) de.Value;
+ Expression e;
+
+ if (seen_names.Contains(member_name)) {
+ Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
+ return null;
+ }
+ seen_names.Add(member_name, 1);
+
+ if (!a.Resolve (ec, Location))
+ return null;
+
+ Expression member = Expression.MemberLookup (
+ ec, Type, member_name,
+ MemberTypes.Field | MemberTypes.Property,
+ BindingFlags.Public | BindingFlags.Instance,
+ Location);
+
+ if (member == null) {
+ member = Expression.MemberLookup (ec, Type, member_name,
+ MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
+ Location);
+
+ if (member != null) {
+ Report.Error_T (122, Location, GetFullMemberName (member_name));
+ return null;
+ }
+ }
+
+ if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
+ Error_InvalidNamedArgument (member_name);
+ return null;
+ }
+
+ e = a.Expr;
+ if (e is TypeParameterExpr){
+ Error_TypeParameterInAttribute (Location);
+ return null;
+ }
+
+ if (member is PropertyExpr) {
+ PropertyExpr pe = (PropertyExpr) member;
+ PropertyInfo pi = pe.PropertyInfo;
+
+ if (!pi.CanWrite) {
+ Error_InvalidNamedArgument (member_name);
+ return null;
+ }
+
+ Type type = e.Type;
+ EmptyCast ecast = e as EmptyCast;
+ if ((ecast != null) && (ecast.Child is Constant))
+ e = ecast.Child;
+
+ Constant c = e as Constant;
+ if (c != null) {
+ if (type != pi.PropertyType) {
+ c = Const.ChangeType (Location, c, pi.PropertyType);
+ if (c == null)
+ return null;
+ }
+
+ object o = c.GetValue ();
+ prop_values.Add (o);
+
+ if (usage_attribute != null) {
+ if (member_name == "AllowMultiple")
+ usage_attribute.AllowMultiple = (bool) o;
+ if (member_name == "Inherited")
+ usage_attribute.Inherited = (bool) o;
+ }
+
+ } else if (e is TypeOf) {
+ prop_values.Add (((TypeOf) e).TypeArg);
+ } else if (e is ArrayCreation) {
+ prop_values.Add (((ArrayCreation) e).EncodeAsAttribute());
+ } else {
+ Error_AttributeArgumentNotValid (Location);
+ return null;
+ }
+
+ prop_infos.Add (pi);
+
+ } else if (member is FieldExpr) {
+ FieldExpr fe = (FieldExpr) member;
+ FieldInfo fi = fe.FieldInfo;
+
+ if (fi.IsInitOnly) {
+ Error_InvalidNamedArgument (member_name);
+ return null;
+ }
+
+ Type type = e.Type;
+ EmptyCast ecast = e as EmptyCast;
+ if ((ecast != null) && (ecast.Child is Constant))
+ e = ecast.Child;
+ //
+ // Handle charset here, and set the TypeAttributes
+
+ Constant c = e as Constant;
+ if (c != null) {
+ if (type != fi.FieldType) {
+ c = Const.ChangeType (Location, c, fi.FieldType);
+ if (c == null)
+ return null;
+ }
+
+ object value = c.GetValue ();
+ field_values.Add (value);
+ } else if (e is TypeOf) {
+ field_values.Add (((TypeOf) e).TypeArg);
+ } else if (e is ArrayCreation) {
+ field_values.Add (((ArrayCreation) e).EncodeAsAttribute());
+ } else {
+ Error_AttributeArgumentNotValid (Location);
+ return null;
+ }
+
+ field_infos.Add (fi);
+ }
+ }
+
+ Expression mg = Expression.MemberLookup (
+ ec, Type, ".ctor", MemberTypes.Constructor,
+ BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
+ Location);
+
+ if (mg == null) {
+ Error_AttributeConstructorMismatch ();
+ return null;
+ }
+
+ MethodBase constructor = Invocation.OverloadResolve (
+ ec, (MethodGroupExpr) mg, pos_args, false, Location);
+
+ if (constructor == null) {
+ return null;
+ }
+
+ //
+ // Now we perform some checks on the positional args as they
+ // cannot be null for a constructor which expects a parameter
+ // of type object
+ //
+
+ ParameterData pd = Invocation.GetParameterData (constructor);
+
+ int group_in_params_array = Int32.MaxValue;
+ int pc = pd.Count;
+ if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
+ group_in_params_array = pc-1;
+
+ for (int j = 0; j < pos_arg_count; ++j) {
+ Argument a = (Argument) pos_args [j];
+
+ if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
+ Error_AttributeArgumentNotValid (Location);
+ return null;
+ }
+
+ if (j < group_in_params_array)
+ continue;
+
+ if (j == group_in_params_array){
+ object v = pos_values [j];
+ int count = pos_arg_count - j;
+
+ object [] array = new object [count];
+ pos_values [j] = array;
+ array [0] = v;
+ } else {
+ object [] array = (object []) pos_values [group_in_params_array];
+
+ array [j - group_in_params_array] = pos_values [j];
+ }
+ }
+
+ //
+ // Adjust the size of the pos_values if it had params
+ //
+ if (group_in_params_array != Int32.MaxValue){
+ int argc = group_in_params_array+1;
+ object [] new_pos_values = new object [argc];
+
+ for (int p = 0; p < argc; p++)
+ new_pos_values [p] = pos_values [p];
+ pos_values = new_pos_values;
+ }
+
+ try {
+ if (named_args.Count > 0) {
+ prop_info_arr = new PropertyInfo [prop_infos.Count];
+ field_info_arr = new FieldInfo [field_infos.Count];
+ field_values_arr = new object [field_values.Count];
+ prop_values_arr = new object [prop_values.Count];
+
+ field_infos.CopyTo (field_info_arr, 0);
+ field_values.CopyTo (field_values_arr, 0);
+
+ prop_values.CopyTo (prop_values_arr, 0);
+ prop_infos.CopyTo (prop_info_arr, 0);
+
+ cb = new CustomAttributeBuilder (
+ (ConstructorInfo) constructor, pos_values,
+ prop_info_arr, prop_values_arr,
+ field_info_arr, field_values_arr);
+ }
+ else
+ cb = new CustomAttributeBuilder (
+ (ConstructorInfo) constructor, pos_values);
+ } catch (NullReferenceException) {
+ //
+ // Don't know what to do here
+ //
+ Report.Warning (
+ -101, Location, "NullReferenceException while trying to create attribute." +
+ "Something's wrong!");
+ } catch (Exception e) {
+ //
+ // Sample:
+ // using System.ComponentModel;
+ // [DefaultValue (CollectionChangeAction.Add)]
+ // class X { static void Main () {} }
+ //
+ Report.Warning (
+ -23, Location, "The compiler can not encode this attribute in .NET due to a bug in the .NET runtime. Try the Mono runtime. The exception was: " + e.Message);
+ }
+
+ return cb;
+ }
+
+ /// <summary>
+ /// Get a string containing a list of valid targets for the attribute 'attr'
+ /// </summary>
+ public string GetValidTargets ()
+ {
+ StringBuilder sb = new StringBuilder ();
+ AttributeTargets targets = GetAttributeUsage ().ValidOn;
+
+ if ((targets & AttributeTargets.Assembly) != 0)
+ sb.Append ("'assembly' ");
+
+ if ((targets & AttributeTargets.Class) != 0)
+ sb.Append ("'class' ");
+
+ if ((targets & AttributeTargets.Constructor) != 0)
+ sb.Append ("'constructor' ");
+
+ if ((targets & AttributeTargets.Delegate) != 0)
+ sb.Append ("'delegate' ");
+
+ if ((targets & AttributeTargets.Enum) != 0)
+ sb.Append ("'enum' ");
+
+ if ((targets & AttributeTargets.Event) != 0)
+ sb.Append ("'event' ");
+
+ if ((targets & AttributeTargets.Field) != 0)
+ sb.Append ("'field' ");
+
+ if ((targets & AttributeTargets.Interface) != 0)
+ sb.Append ("'interface' ");
+
+ if ((targets & AttributeTargets.Method) != 0)
+ sb.Append ("'method' ");
+
+ if ((targets & AttributeTargets.Module) != 0)
+ sb.Append ("'module' ");
+
+ if ((targets & AttributeTargets.Parameter) != 0)
+ sb.Append ("'parameter' ");
+
+ if ((targets & AttributeTargets.Property) != 0)
+ sb.Append ("'property' ");
+
+ if ((targets & AttributeTargets.ReturnValue) != 0)
+ sb.Append ("'return' ");
+
+ if ((targets & AttributeTargets.Struct) != 0)
+ sb.Append ("'struct' ");
+
+ return sb.ToString ();
+
+ }
+
+ /// <summary>
+ /// Returns AttributeUsage attribute for this type
+ /// </summary>
+ public AttributeUsageAttribute GetAttributeUsage ()
+ {
+ AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
+ if (ua != null)
+ return ua;
+
+ Class attr_class = TypeManager.LookupClass (Type);
+
+ if (attr_class == null) {
+ object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
+ ua = (AttributeUsageAttribute)usage_attr [0];
+ usage_attr_cache.Add (Type, ua);
+ return ua;
+ }
+
+ return attr_class.AttributeUsage;
+ }
+
+ /// <summary>
+ /// Returns custom name of indexer
+ /// </summary>
+ public string GetIndexerAttributeValue (EmitContext ec)
+ {
+ if (pos_values == null) {
+ // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
+ // But because a lot of attribute class code must be rewritten will be better to wait...
+ Resolve (ec);
+ }
+
+ return pos_values [0] as string;
+ }
+
+ /// <summary>
+ /// Returns condition of ConditionalAttribute
+ /// </summary>
+ public string GetConditionalAttributeValue (DeclSpace ds)
+ {
+ if (pos_values == null) {
+ EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
+
+ // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
+ // But because a lot of attribute class code must be rewritten will be better to wait...
+ Resolve (ec);
+ }
+
+ // Some error occurred
+ if (pos_values [0] == null)
+ return null;
+
+ return (string)pos_values [0];
+ }
+
+ /// <summary>
+ /// Creates the instance of ObsoleteAttribute from this attribute instance
+ /// </summary>
+ public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
+ {
+ if (pos_values == null) {
+ EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
+
+ // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
+ // But because a lot of attribute class code must be rewritten will be better to wait...
+ Resolve (ec);
+ }
+
+ // Some error occurred
+ if (pos_values == null)
+ return null;
+
+ if (pos_values.Length == 0)
+ return new ObsoleteAttribute ();
+
+ if (pos_values.Length == 1)
+ return new ObsoleteAttribute ((string)pos_values [0]);
+
+ return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
+ }
+
+ /// <summary>
+ /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
+ /// before ApplyAttribute. We need to resolve the arguments.
+ /// This situation occurs when class deps is differs from Emit order.
+ /// </summary>
+ public bool GetClsCompliantAttributeValue (DeclSpace ds)
+ {
+ if (pos_values == null) {
+ EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
+
+ // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
+ // But because a lot of attribute class code must be rewritten will be better to wait...
+ Resolve (ec);
+ }
+
+ // Some error occurred
+ if (pos_values [0] == null)
+ return false;
+
+ return (bool)pos_values [0];
+ }
+