// enum.cs: Enum handling.
//
// Author: Miguel de Icaza (miguel@gnu.org)
+// Ravi Pratap (ravi@ximian.com)
//
// Licensed under the terms of the GNU GPL
//
using System;
using System.Collections;
+using System.Reflection;
+using System.Reflection.Emit;
-namespace CIR {
+namespace Mono.CSharp {
+ /// <summary>
+ /// Enumeration container
+ /// </summary>
public class Enum : DeclSpace {
+
ArrayList ordered_enums;
- TypeRef typeref;
- string name;
+ public readonly string BaseType;
+ public readonly string EnumName;
int mod_flags;
+ public TypeBuilder EnumBuilder;
+ public Attributes OptAttributes;
+
+ public Type UnderlyingType;
+
+ Hashtable member_to_location;
+ //
+ // This is for members that have been defined
+ //
+ Hashtable member_to_value;
+
+ ArrayList field_builders;
+ Location loc;
+
public const int AllowedModifiers =
Modifiers.NEW |
Modifiers.PUBLIC |
Modifiers.INTERNAL |
Modifiers.PRIVATE;
- public Enum (TypeRef typeref, int mod_flags, string name) : base (name)
+ public Enum (string type, int mod_flags, string name, Attributes attrs, Location l)
+ : base (name, l)
{
- this.typeref = typeref;
- this.name = name;
+ this.BaseType = type;
+ this.EnumName = name;
this.mod_flags = Modifiers.Check (AllowedModifiers, mod_flags, Modifiers.PUBLIC);
+ OptAttributes = attrs;
+ loc = l;
ordered_enums = new ArrayList ();
+ member_to_location = new Hashtable ();
+ member_to_value = new Hashtable ();
+ field_builders = new ArrayList ();
}
- // <summary>
- // Adds @name to the enumeration space, with @expr
- // being its definition.
- // </summary>
- public AdditionResult AddEnum (string name, Expression expr)
+ /// <summary>
+ /// Adds @name to the enumeration space, with @expr
+ /// being its definition.
+ /// </summary>
+ public AdditionResult AddEnumMember (string name, Expression expr, Location loc)
{
if (defined_names.Contains (name))
return AdditionResult.NameExists;
DefineName (name, expr);
ordered_enums.Add (name);
+ member_to_location.Add (name, loc);
+
return AdditionResult.Success;
}
- public Type Type {
- get {
- return typeref.Type;
+ public void DefineEnum (object parent_builder)
+ {
+ TypeAttributes attr = TypeAttributes.Class | TypeAttributes.Sealed;
+
+ UnderlyingType = RootContext.TypeManager.LookupType (BaseType);
+
+ if (UnderlyingType != TypeManager.int32_type &&
+ UnderlyingType != TypeManager.uint32_type &&
+ UnderlyingType != TypeManager.int64_type &&
+ UnderlyingType != TypeManager.uint64_type &&
+ UnderlyingType != TypeManager.short_type &&
+ UnderlyingType != TypeManager.ushort_type &&
+ UnderlyingType != TypeManager.byte_type &&
+ UnderlyingType != TypeManager.sbyte_type) {
+ Report.Error (1008, Location,
+ "Type byte, sbyte, short, ushort, int, uint, " +
+ "long, or ulong expected");
+ return;
+ }
+
+ if (parent_builder is ModuleBuilder) {
+ ModuleBuilder builder = (ModuleBuilder) parent_builder;
+
+ if ((ModFlags & Modifiers.PUBLIC) != 0)
+ attr |= TypeAttributes.Public;
+ else
+ attr |= TypeAttributes.NotPublic;
+
+ EnumBuilder = builder.DefineType (EnumName, attr, TypeManager.enum_type);
+
+ } else {
+ TypeBuilder builder = (TypeBuilder) parent_builder;
+
+ if ((ModFlags & Modifiers.PUBLIC) != 0)
+ attr |= TypeAttributes.NestedPublic;
+ else
+ attr |= TypeAttributes.NestedPrivate;
+
+ EnumBuilder = builder.DefineNestedType (EnumName, attr, TypeManager.enum_type);
+ }
+
+ EnumBuilder.DefineField ("value__", UnderlyingType,
+ FieldAttributes.Public | FieldAttributes.SpecialName);
+
+ RootContext.TypeManager.AddEnumType (EnumName, EnumBuilder, this);
+
+ return;
+ }
+
+ bool IsValidEnumLiteral (Expression e)
+ {
+ if (!(e is Literal))
+ return false;
+
+ if (e is IntLiteral || e is UIntLiteral || e is LongLiteral || e is ULongLiteral || e is EnumLiteral)
+ return true;
+ else
+ return false;
+ }
+
+ object GetNextDefaultValue (object default_value)
+ {
+ if (UnderlyingType == TypeManager.int32_type) {
+ int i = (int) default_value;
+
+ if (i < System.Int32.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.uint32_type) {
+ uint i = (uint) default_value;
+
+ if (i < System.UInt32.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.int64_type) {
+ long i = (long) default_value;
+
+ if (i < System.Int64.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.uint64_type) {
+ ulong i = (ulong) default_value;
+
+ if (i < System.UInt64.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.short_type) {
+ short i = (short) default_value;
+
+ if (i < System.Int16.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.ushort_type) {
+ ushort i = (ushort) default_value;
+
+ if (i < System.UInt16.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.byte_type) {
+ byte i = (byte) default_value;
+
+ if (i < System.Byte.MaxValue)
+ return ++i;
+ else
+ return null;
+ } else if (UnderlyingType == TypeManager.sbyte_type) {
+ sbyte i = (sbyte) default_value;
+
+ if (i < System.SByte.MaxValue)
+ return ++i;
+ else
+ return null;
}
+
+ return null;
+ }
+
+ void error31 (object val, Location loc)
+ {
+ if (val is Literal)
+ Report.Error (31, loc, "Constant value '" + ((Literal) val).AsString () +
+ "' cannot be converted" +
+ " to a " + TypeManager.CSharpName (UnderlyingType));
+ else
+ Report.Error (31, loc, "Constant value '" + val +
+ "' cannot be converted" +
+ " to a " + TypeManager.CSharpName (UnderlyingType));
+ return;
}
+ /// <summary>
+ /// This is used to lookup the value of an enum member. If the member is undefined,
+ /// it attempts to define it and return its value
+ /// </summary>
+ public object LookupEnumValue (EmitContext ec, string name, Location loc)
+ {
+ object default_value = null;
+ Literal l = null;
+
+ default_value = member_to_value [name];
+
+ if (default_value != null)
+ return default_value;
+
+ if (!defined_names.Contains (name)) {
+ Report.Error (117, loc, "'"+ EnumName + "' does not contain a definition for '"
+ + name + "'");
+ return null;
+ }
+
+ //
+ // So if the above doesn't happen, we have a member that is undefined
+ // We now proceed to define it
+ //
+ Expression val = this [name];
+
+ if (val == null) {
+
+ int idx = ordered_enums.IndexOf (name);
+
+ if (idx == 0)
+ default_value = 0;
+ else {
+ for (int i = 0; i < idx; ++i) {
+ string n = (string) ordered_enums [i];
+ Location m_loc = (Location) member_to_location [n];
+ default_value = LookupEnumValue (ec, n, m_loc);
+ }
+
+ default_value = GetNextDefaultValue (default_value);
+ }
+
+ } else {
+ val = val.Resolve (ec);
+
+ if (val == null) {
+ Report.Error (-12, loc, "Definition is circular.");
+ return null;
+ }
+
+ if (IsValidEnumLiteral (val)) {
+ l = (Literal) val;
+ default_value = l.GetValue ();
+
+ if (default_value == null) {
+ error31 (l, loc);
+ return null;
+ }
+
+ } else {
+ Report.Error (1008, loc,
+ "Type byte, sbyte, short, ushort, int, uint, long, or ulong expected");
+ return null;
+ }
+ }
+
+ FieldAttributes attr = FieldAttributes.Public | FieldAttributes.Static
+ | FieldAttributes.Literal;
+
+ FieldBuilder fb = EnumBuilder.DefineField (name, UnderlyingType, attr);
+
+ try {
+ default_value = Convert.ChangeType (default_value, UnderlyingType);
+ } catch {
+ error31 (l, loc);
+ return null;
+ }
+
+ fb.SetConstant (default_value);
+ field_builders.Add (fb);
+ member_to_value [name] = default_value;
+
+ if (!TypeManager.RegisterField (fb, default_value))
+ return null;
+
+ return default_value;
+ }
+
+ public void Populate (TypeContainer tc)
+ {
+ //
+ // If there was an error during DefineEnum, return
+ //
+ if (EnumBuilder == null)
+ return;
+
+ EmitContext ec = new EmitContext (tc, Location, null, UnderlyingType, ModFlags);
+
+ object default_value = 0;
+
+ FieldAttributes attr = FieldAttributes.Public | FieldAttributes.Static
+ | FieldAttributes.Literal;
+
+
+ foreach (string name in ordered_enums) {
+
+ Expression val;
+
+ //
+ // Have we already been defined, thanks to some cross-referencing ?
+ //
+ if (member_to_value.Contains (name))
+ continue;
+
+ Location loc = (Location) member_to_location [name];
+
+ if (this [name] != null) {
+ default_value = LookupEnumValue (ec, name, loc);
+
+ if (default_value == null)
+ return;
+
+ } else {
+
+ FieldBuilder fb = EnumBuilder.DefineField (name, UnderlyingType, attr);
+
+ if (default_value == null) {
+ Report.Error (543, loc, "Enumerator value for '" + name + "' is too large to " +
+ "fit in its type");
+ return;
+ }
+
+ try {
+ default_value = Convert.ChangeType (default_value, UnderlyingType);
+ } catch {
+ error31 (default_value, loc);
+ return;
+ }
+
+ val = Expression.Literalize (default_value, UnderlyingType);
+
+ fb.SetConstant (default_value);
+ field_builders.Add (fb);
+ member_to_value [name] = default_value;
+
+ if (!TypeManager.RegisterField (fb, default_value))
+ return;
+ }
+
+ default_value = GetNextDefaultValue (default_value);
+ }
+
+ if (OptAttributes == null)
+ return;
+
+ if (OptAttributes.AttributeSections == null)
+ return;
+
+ foreach (AttributeSection asec in OptAttributes.AttributeSections) {
+ if (asec.Attributes == null)
+ continue;
+
+ foreach (Attribute a in asec.Attributes) {
+ CustomAttributeBuilder cb = a.Resolve (ec);
+
+ if (cb == null)
+ continue;
+
+ EnumBuilder.SetCustomAttribute (cb);
+ }
+ }
+ }
+
+ //
+ // Hack around System.Reflection as found everywhere else
+ //
+ public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, MemberFilter filter, object criteria)
+ {
+ ArrayList members = new ArrayList ();
+
+ if ((mt & MemberTypes.Field) != 0) {
+ foreach (FieldBuilder fb in field_builders)
+ if (filter (fb, criteria) == true)
+ members.Add (fb);
+ }
+
+ int count = members.Count;
+
+ if (count > 0) {
+ MemberInfo [] mi = new MemberInfo [count];
+ members.CopyTo (mi, 0);
+ return mi;
+ }
+
+ return null;
+ }
+
+ public void CloseEnum ()
+ {
+ EnumBuilder.CreateType ();
+ }
+
public ArrayList ValueNames {
get {
return ordered_enums;
return (Expression) defined_names [name];
}
}
-
- public override Type Define (Tree tree)
- {
- return null;
- }
}
}
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