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-rw-r--r--mcs/mbas/enum.cs470
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diff --git a/mcs/mbas/enum.cs b/mcs/mbas/enum.cs
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-//
-// enum.cs: Enum handling.
-//
-// Author: Miguel de Icaza (miguel@gnu.org)
-// Ravi Pratap (ravi@ximian.com)
-//
-// Licensed under the terms of the GNU GPL
-//
-// (C) 2001 Ximian, Inc (http://www.ximian.com)
-//
-
-using System;
-using System.Collections;
-using System.Reflection;
-using System.Reflection.Emit;
-
-namespace Mono.CSharp {
-
- /// <summary>
- /// Enumeration container
- /// </summary>
- public class Enum : DeclSpace {
-
- ArrayList ordered_enums;
- public readonly string BaseType;
- public Attributes OptAttributes;
-
- public Type UnderlyingType;
-
- Hashtable member_to_location;
- Hashtable member_to_attributes;
-
- //
- // This is for members that have been defined
- //
- Hashtable member_to_value;
-
- ArrayList field_builders;
-
- public const int AllowedModifiers =
- Modifiers.NEW |
- Modifiers.PUBLIC |
- Modifiers.PROTECTED |
- Modifiers.INTERNAL |
- Modifiers.PRIVATE;
-
- public Enum (TypeContainer parent, string type, int mod_flags, string name, Attributes attrs, Location l)
- : base (parent, name, l)
- {
- this.BaseType = type;
- ModFlags = Modifiers.Check (AllowedModifiers, mod_flags, Modifiers.PUBLIC, l);
- OptAttributes = attrs;
-
- 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 AddEnumMember (string name, Expression expr, Location loc,
- Attributes opt_attrs)
- {
- if (defined_names.Contains (name))
- return AdditionResult.NameExists;
-
- DefineName (name, expr);
-
- ordered_enums.Add (name);
- member_to_location.Add (name, loc);
-
- if (member_to_attributes == null)
- member_to_attributes = new Hashtable ();
-
- member_to_attributes.Add (name, opt_attrs);
-
- return AdditionResult.Success;
- }
-
- //
- // This is used by corlib compilation: we map from our
- // type to a type that is consumable by the DefineField
- //
- Type MapToInternalType (Type t)
- {
- if (t == TypeManager.int32_type)
- return typeof (int);
- if (t == TypeManager.int64_type)
- return typeof (long);
- if (t == TypeManager.uint32_type)
- return typeof (uint);
- if (t == TypeManager.uint64_type)
- return typeof (ulong);
- if (t == TypeManager.float_type)
- return typeof (float);
- if (t == TypeManager.double_type)
- return typeof (double);
- if (t == TypeManager.byte_type)
- return typeof (byte);
- if (t == TypeManager.sbyte_type)
- return typeof (sbyte);
- if (t == TypeManager.char_type)
- return typeof (char);
- if (t == TypeManager.short_type)
- return typeof (short);
- if (t == TypeManager.ushort_type)
- return typeof (ushort);
-
- throw new Exception ();
- }
-
- public override TypeBuilder DefineType ()
- {
- if (TypeBuilder != null)
- return TypeBuilder;
-
- TypeAttributes attr = TypeAttributes.Class | TypeAttributes.Sealed;
-
- UnderlyingType = 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 (got: " +
- TypeManager.CSharpName (UnderlyingType) + ")");
- return null;
- }
-
- if (IsTopLevel) {
- ModuleBuilder builder = CodeGen.ModuleBuilder;
-
- if ((ModFlags & Modifiers.PUBLIC) != 0)
- attr |= TypeAttributes.Public;
- else
- attr |= TypeAttributes.NotPublic;
-
- TypeBuilder = builder.DefineType (Name, attr, TypeManager.enum_type);
- } else {
- TypeBuilder builder = Parent.TypeBuilder;
-
- if ((ModFlags & Modifiers.PUBLIC) != 0)
- attr |= TypeAttributes.NestedPublic;
- else
- attr |= TypeAttributes.NestedPrivate;
-
-
- TypeBuilder = builder.DefineNestedType (
- Basename, attr, TypeManager.enum_type);
- }
-
- //
- // Call MapToInternalType for corlib
- //
- TypeBuilder.DefineField ("value__", UnderlyingType,
- FieldAttributes.Public | FieldAttributes.SpecialName
- | FieldAttributes.RTSpecialName);
-
- TypeManager.AddEnumType (Name, TypeBuilder, this);
-
- return TypeBuilder;
- }
-
- bool IsValidEnumConstant (Expression e)
- {
- if (!(e is Constant))
- return false;
-
- if (e is IntConstant || e is UIntConstant || e is LongConstant ||
- e is ByteConstant || e is SByteConstant || e is ShortConstant ||
- e is UShortConstant || e is ULongConstant || e is EnumConstant)
- 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 Error_ConstantValueCannotBeConverted (object val, Location loc)
- {
- if (val is Constant)
- Report.Error (31, loc, "Constant value '" + ((Constant) 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;
- Constant c = null;
-
- default_value = member_to_value [name];
-
- if (default_value != null)
- return default_value;
-
- //
- // This may happen if we're calling a method in System.Enum, for instance
- // Enum.IsDefined().
- //
- if (!defined_names.Contains (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 = (Mono.CSharp.Location)
- member_to_location [n];
- default_value = LookupEnumValue (ec, n, m_loc);
- }
-
- default_value = GetNextDefaultValue (default_value);
- }
-
- } else {
- bool old = ec.InEnumContext;
- ec.InEnumContext = true;
- val = val.Resolve (ec);
- ec.InEnumContext = old;
-
- if (val == null) {
- Report.Error (-12, loc, "Definition is circular.");
- return null;
- }
-
- if (IsValidEnumConstant (val)) {
- c = (Constant) val;
- default_value = c.GetValue ();
-
- if (default_value == null) {
- Error_ConstantValueCannotBeConverted (c, loc);
- return null;
- }
-
- } else {
- Report.Error (
- 1008, loc,
- "Type byte, sbyte, short, ushort, int, uint, long, or " +
- "ulong expected (have: " + val + ")");
- return null;
- }
- }
-
- FieldAttributes attr = FieldAttributes.Public | FieldAttributes.Static
- | FieldAttributes.Literal;
-
- FieldBuilder fb = TypeBuilder.DefineField (name, UnderlyingType, attr);
-
- try {
- default_value = TypeManager.ChangeType (default_value, UnderlyingType);
- } catch {
- Error_ConstantValueCannotBeConverted (c, loc);
- return null;
- }
-
- fb.SetConstant (default_value);
- field_builders.Add (fb);
- member_to_value [name] = default_value;
-
- if (!TypeManager.RegisterFieldValue (fb, default_value))
- return null;
-
- //
- // Now apply attributes
- //
- Attribute.ApplyAttributes (ec, fb, fb, (Attributes) member_to_attributes [name], loc);
-
- return default_value;
- }
-
- public override bool Define (TypeContainer parent)
- {
- //
- // If there was an error during DefineEnum, return
- //
- if (TypeBuilder == null)
- return false;
-
- EmitContext ec = new EmitContext (parent, this, Location, null,
- UnderlyingType, ModFlags, false);
-
- object default_value = 0;
-
- FieldAttributes attr = FieldAttributes.Public | FieldAttributes.Static
- | FieldAttributes.Literal;
-
-
- foreach (string name in ordered_enums) {
- //
- // Have we already been defined, thanks to some cross-referencing ?
- //
- if (member_to_value.Contains (name))
- continue;
-
- Location loc = (Mono.CSharp.Location) member_to_location [name];
-
- if (this [name] != null) {
- default_value = LookupEnumValue (ec, name, loc);
-
- if (default_value == null)
- return true;
-
- } else {
- FieldBuilder fb = TypeBuilder.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 false;
- }
-
- try {
- default_value = TypeManager.ChangeType (default_value, UnderlyingType);
- } catch {
- Error_ConstantValueCannotBeConverted (default_value, loc);
- return false;
- }
-
- fb.SetConstant (default_value);
- field_builders.Add (fb);
- member_to_value [name] = default_value;
-
- if (!TypeManager.RegisterFieldValue (fb, default_value))
- return false;
-
- //
- // Apply attributes on the enum member
- //
- Attribute.ApplyAttributes (ec, fb, fb, (Attributes) member_to_attributes [name], loc);
- }
-
- default_value = GetNextDefaultValue (default_value);
- }
-
- Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes, Location);
-
- return true;
- }
-
- //
- // 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 ArrayList ValueNames {
- get {
- return ordered_enums;
- }
- }
-
- // indexer
- public Expression this [string name] {
- get {
- return (Expression) defined_names [name];
- }
- }
- }
-}
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