// 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.Reflection;
using System.Reflection.Emit;
-namespace CIR {
+namespace Mono.CSharp {
+ /// <summary>
+ /// Enumeration container
+ /// </summary>
public class Enum : DeclSpace {
-
ArrayList ordered_enums;
- string type;
- string name;
- int mod_flags;
- public EnumBuilder EnumBuilder;
+
+ public Expression 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;
+
+ //
+ // This is used to mark members we're currently defining
+ //
+ Hashtable in_transit;
+
+ ArrayList field_builders;
public const int AllowedModifiers =
Modifiers.NEW |
Modifiers.INTERNAL |
Modifiers.PRIVATE;
- public Enum (string type, int mod_flags, string name) : base (name)
+ public Enum (TypeContainer parent, Expression type, int mod_flags, string name, Attributes attrs, Location l)
+ : base (parent, name, l)
{
- this.type = type;
- this.name = name;
- this.mod_flags = Modifiers.Check (AllowedModifiers, mod_flags, Modifiers.PUBLIC);
+ this.BaseType = type;
+ ModFlags = Modifiers.Check (AllowedModifiers, mod_flags,
+ IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE, l);
+ OptAttributes = attrs;
ordered_enums = new ArrayList ();
+ member_to_location = new Hashtable ();
+ member_to_value = new Hashtable ();
+ in_transit = 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)
+ /// <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;
}
- public void Define (TypeContainer parent)
+ //
+ // 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 ()
{
- TypeAttributes attr = Modifiers.TypeAttr (ModFlags);
+ if (TypeBuilder != null)
+ return TypeBuilder;
- Type t = System.Type.GetType (type);
+ TypeAttributes attr = Modifiers.TypeAttr (ModFlags, IsTopLevel);
- EnumBuilder = parent.RootContext.CodeGen.ModuleBuilder.DefineEnum (name, attr, t);
+ attr |= TypeAttributes.Class | TypeAttributes.Sealed;
+
+ UnderlyingType = ResolveType (BaseType, false, Location);
+
+ 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;
+
+ TypeBuilder = builder.DefineType (Name, attr, TypeManager.enum_type);
+ } else {
+ TypeBuilder builder = Parent.TypeBuilder;
+
+ 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;
}
- public string Type {
- get {
- return type;
+ 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;
}
- public ArrayList ValueNames {
+ 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>
+ /// Determines if a standard implicit conversion exists from
+ /// expr_type to target_type
+ /// </summary>
+ public static bool ImplicitConversionExists (Type expr_type, Type target_type)
+ {
+ expr_type = TypeManager.TypeToCoreType (expr_type);
+
+ if (expr_type == TypeManager.void_type)
+ return false;
+
+ if (expr_type == target_type)
+ return true;
+
+ // First numeric conversions
+
+ if (expr_type == TypeManager.sbyte_type){
+ //
+ // From sbyte to short, int, long, float, double.
+ //
+ if ((target_type == TypeManager.int32_type) ||
+ (target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.short_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.byte_type){
+ //
+ // From byte to short, ushort, int, uint, long, ulong, float, double
+ //
+ if ((target_type == TypeManager.short_type) ||
+ (target_type == TypeManager.ushort_type) ||
+ (target_type == TypeManager.int32_type) ||
+ (target_type == TypeManager.uint32_type) ||
+ (target_type == TypeManager.uint64_type) ||
+ (target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.short_type){
+ //
+ // From short to int, long, float, double
+ //
+ if ((target_type == TypeManager.int32_type) ||
+ (target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.ushort_type){
+ //
+ // From ushort to int, uint, long, ulong, float, double
+ //
+ if ((target_type == TypeManager.uint32_type) ||
+ (target_type == TypeManager.uint64_type) ||
+ (target_type == TypeManager.int32_type) ||
+ (target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.int32_type){
+ //
+ // From int to long, float, double
+ //
+ if ((target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.uint32_type){
+ //
+ // From uint to long, ulong, float, double
+ //
+ if ((target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.uint64_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if ((expr_type == TypeManager.uint64_type) ||
+ (expr_type == TypeManager.int64_type)) {
+ //
+ // From long/ulong to float, double
+ //
+ if ((target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.char_type){
+ //
+ // From char to ushort, int, uint, long, ulong, float, double
+ //
+ if ((target_type == TypeManager.ushort_type) ||
+ (target_type == TypeManager.int32_type) ||
+ (target_type == TypeManager.uint32_type) ||
+ (target_type == TypeManager.uint64_type) ||
+ (target_type == TypeManager.int64_type) ||
+ (target_type == TypeManager.float_type) ||
+ (target_type == TypeManager.double_type) ||
+ (target_type == TypeManager.decimal_type))
+ return true;
+
+ } else if (expr_type == TypeManager.float_type){
+ //
+ // float to double
+ //
+ if (target_type == TypeManager.double_type)
+ return true;
+ }
+
+ return false;
+ }
+
+ /// <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;
+
+ if (in_transit.Contains (name)) {
+ Report.Error (110, loc, "The evaluation of the constant value for `" +
+ Name + "." + name + "' involves a circular definition.");
+ 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];
+ in_transit.Add (name, true);
+ default_value = LookupEnumValue (ec, n, m_loc);
+ in_transit.Remove (name);
+ if (default_value == null)
+ return null;
+ }
+
+ default_value = GetNextDefaultValue (default_value);
+ }
+
+ } else {
+ bool old = ec.InEnumContext;
+ ec.InEnumContext = true;
+ in_transit.Add (name, true);
+ val = val.Resolve (ec);
+ in_transit.Remove (name);
+ ec.InEnumContext = old;
+
+ if (val == null)
+ return null;
+
+ if (!IsValidEnumConstant (val)) {
+ Report.Error (
+ 1008, loc,
+ "Type byte, sbyte, short, ushort, int, uint, long, or " +
+ "ulong expected (have: " + val + ")");
+ return null;
+ }
+
+ c = (Constant) val;
+ default_value = c.GetValue ();
+
+ if (default_value == null) {
+ Error_ConstantValueCannotBeConverted (c, loc);
+ return null;
+ }
+
+ if (val is EnumConstant){
+ Type etype = TypeManager.EnumToUnderlying (c.Type);
+
+ if (!ImplicitConversionExists (etype, UnderlyingType)){
+ Expression.Error_CannotConvertImplicit (
+ loc, c.Type, UnderlyingType);
+ 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 DefineMembers (TypeContainer parent)
+ {
+ return true;
+ }
+
+ 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;
+ }
+
+ //
+ // IMemberFinder
+ //
+ public override MemberList 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);
+ }
+
+ return new MemberList (members);
+ }
+
+ public override MemberCache MemberCache {
get {
- return ordered_enums;
+ return null;
}
}
- public int ModFlags {
+ public ArrayList ValueNames {
get {
- return mod_flags;
+ return ordered_enums;
}
}
-
+
// indexer
public Expression this [string name] {
get {
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