//
-// constant.cs: Constant expressions and constant folding.
+// constant.cs: Constants.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
//
// (C) 2001 Ximian, Inc.
//
namespace Mono.CSharp {
using System;
- using System.Reflection;
using System.Reflection.Emit;
- using System.Collections;
+ /// <summary>
+ /// Base class for constants and literals.
+ /// </summary>
+ public abstract class Constant : Expression {
- public class Constant : Expression {
+ protected Constant (Location loc)
+ {
+ this.loc = loc;
+ }
+
+ /// <remarks>
+ /// This is different from ToString in that ToString
+ /// is supposed to be there for debugging purposes,
+ /// and is not guaranteed to be useful for anything else,
+ /// AsString() will provide something that can be used
+ /// for round-tripping C# code. Maybe it can be used
+ /// for IL assembly as well.
+ /// </remarks>
+ public abstract string AsString ();
+
+ override public string ToString ()
+ {
+ return this.GetType ().Name + " (" + AsString () + ")";
+ }
+
+ public override bool GetAttributableValue (Type valueType, out object value)
+ {
+ Constant c = ImplicitConversionRequired (valueType, loc);
+ if (c == null) {
+ value = null;
+ return false;
+ }
+
+ value = c.GetTypedValue ();
+ return true;
+ }
+
+ /// <summary>
+ /// This is used to obtain the actual value of the literal
+ /// cast into an object.
+ /// </summary>
+ public abstract object GetValue ();
+
+ public virtual object GetTypedValue ()
+ {
+ return GetValue ();
+ }
+
+ /// <summary>
+ /// Constants are always born in a fully resolved state
+ /// </summary>
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public Constant ImplicitConversionRequired (Type type, Location loc)
+ {
+ Constant c = ConvertImplicitly (type);
+ if (c == null)
+ Error_ValueCannotBeConverted (null, loc, type, false);
+ return c;
+ }
+
+ public virtual Constant ConvertImplicitly (Type type)
+ {
+ if (this.type == type)
+ return this;
+
+ if (type == TypeManager.object_type)
+ return new EmptyConstantCast (this, type);
+
+ if (Convert.ImplicitNumericConversion (this, type) == null)
+ return null;
+
+ bool fail;
+ object constant_value = TypeManager.ChangeType (GetValue (), type, out fail);
+ if (fail){
+ //
+ // We should always catch the error before this is ever
+ // reached, by calling Convert.ImplicitStandardConversionExists
+ //
+ throw new Exception (
+ String.Format ("LookupConstantValue: This should never be reached {0} {1}", Type, type));
+ }
+
+ return CreateConstant (type, constant_value, loc);
+ }
+
+ /// Returns a constant instance based on Type
+ /// The returned value is already resolved.
+ public static Constant CreateConstant (Type t, object v, Location loc)
+ {
+ if (t == TypeManager.int32_type)
+ return new IntConstant ((int) v, loc);
+ if (t == TypeManager.string_type)
+ return new StringConstant ((string) v, loc);
+ if (t == TypeManager.uint32_type)
+ return new UIntConstant ((uint) v, loc);
+ if (t == TypeManager.int64_type)
+ return new LongConstant ((long) v, loc);
+ if (t == TypeManager.uint64_type)
+ return new ULongConstant ((ulong) v, loc);
+ if (t == TypeManager.float_type)
+ return new FloatConstant ((float) v, loc);
+ if (t == TypeManager.double_type)
+ return new DoubleConstant ((double) v, loc);
+ if (t == TypeManager.short_type)
+ return new ShortConstant ((short)v, loc);
+ if (t == TypeManager.ushort_type)
+ return new UShortConstant ((ushort)v, loc);
+ if (t == TypeManager.sbyte_type)
+ return new SByteConstant ((sbyte)v, loc);
+ if (t == TypeManager.byte_type)
+ return new ByteConstant ((byte)v, loc);
+ if (t == TypeManager.char_type)
+ return new CharConstant ((char)v, loc);
+ if (t == TypeManager.bool_type)
+ return new BoolConstant ((bool) v, loc);
+ if (t == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) v, loc);
+ if (TypeManager.IsEnumType (t)) {
+ Type real_type = TypeManager.TypeToCoreType (v.GetType ());
+ if (real_type == t)
+ real_type = System.Enum.GetUnderlyingType (real_type);
+ return new EnumConstant (CreateConstant (real_type, v, loc), t);
+ }
+ if (v == null && !TypeManager.IsValueType (t))
+ return new EmptyConstantCast (new NullConstant (loc), t);
+
+ throw new Exception ("Unknown type for constant (" + t +
+ "), details: " + v);
+ }
+
+ protected static void CheckRange (bool inCheckedContext, ulong value, ulong max)
+ {
+ if (!inCheckedContext)
+ return;
+
+ if (value > max)
+ throw new OverflowException ();
+ }
+
+ protected static void CheckRange (bool inCheckedContext, double value, long min, long max)
+ {
+ if (!inCheckedContext)
+ return;
+
+ if (((value < min) || (value > max)))
+ throw new OverflowException ();
+
+ if (double.IsNaN (value))
+ throw new OverflowException ();
+ }
+
+ protected static void CheckRange (bool inCheckedContext, double value, ulong min, ulong max)
+ {
+ if (!inCheckedContext)
+ return;
+
+ if (((value < min) || (value > max)))
+ throw new OverflowException ();
+
+ if (double.IsNaN (value))
+ throw new OverflowException ();
+ }
+
+ protected static void CheckUnsigned (bool inCheckedContext, long value)
+ {
+ if (!inCheckedContext)
+ return;
+
+ if (value < 0)
+ throw new OverflowException ();
+ }
+
+ /// <summary>
+ /// Maybe ConvertTo name is better. It tries to convert `this' constant to target_type.
+ /// It throws OverflowException
+ /// </summary>
+ // DON'T CALL THIS METHOD DIRECTLY AS IT DOES NOT HANDLE ENUMS
+ public abstract Constant ConvertExplicitly (bool inCheckedContext, Type target_type);
+
+ /// <summary>
+ /// Attempts to do a compile-time folding of a constant cast.
+ /// </summary>
+ public Constant TryReduce (EmitContext ec, Type target_type, Location loc)
+ {
+ try {
+ return TryReduce (ec, target_type);
+ }
+ catch (OverflowException) {
+ Report.Error (221, loc, "Constant value `{0}' cannot be converted to a `{1}' (use `unchecked' syntax to override)",
+ GetValue ().ToString (), TypeManager.CSharpName (target_type));
+ return null;
+ }
+ }
+
+ Constant TryReduce (EmitContext ec, Type target_type)
+ {
+ if (Type == target_type)
+ return this;
+
+ if (TypeManager.IsEnumType (target_type)) {
+ Constant c = TryReduce (ec, TypeManager.EnumToUnderlying (target_type));
+ if (c == null)
+ return null;
+
+ return new EnumConstant (c, target_type);
+ }
+
+ return ConvertExplicitly (ec.ConstantCheckState, target_type);
+ }
+
+ public abstract Constant Increment ();
+
+ /// <summary>
+ /// Need to pass type as the constant can require a boxing
+ /// and in such case no optimization is possible
+ /// </summary>
+ public bool IsDefaultInitializer (Type type)
+ {
+ if (type == Type)
+ return IsDefaultValue;
+
+ return Type == TypeManager.null_type;
+ }
+
+ public abstract bool IsDefaultValue {
+ get;
+ }
+
+ public abstract bool IsNegative {
+ get;
+ }
+
+ //
+ // Returns true iff 1) the stack type of this is one of Object,
+ // int32, int64 and 2) this == 0 or this == null.
+ //
+ public virtual bool IsZeroInteger {
+ get { return false; }
+ }
+ }
+
+ public abstract class IntegralConstant : Constant {
+ protected IntegralConstant (Location loc) :
+ base (loc)
+ {
+ }
+
+ public override void Error_ValueCannotBeConverted (EmitContext ec, Location loc, Type target, bool expl)
+ {
+ try {
+ ConvertExplicitly (true, target);
+ base.Error_ValueCannotBeConverted (ec, loc, target, expl);
+ }
+ catch
+ {
+ Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
+ GetValue ().ToString (), TypeManager.CSharpName (target));
+ }
+ }
+ }
+
+ public class BoolConstant : Constant {
+ public readonly bool Value;
+
+ public BoolConstant (bool val, Location loc):
+ base (loc)
+ {
+ type = TypeManager.bool_type;
+ eclass = ExprClass.Value;
+
+ Value = val;
+ }
+
+ override public string AsString ()
+ {
+ return Value ? "true" : "false";
+ }
+
+ public override object GetValue ()
+ {
+ return (object) Value;
+ }
+
+
+ public override void Emit (EmitContext ec)
+ {
+ if (Value)
+ ec.ig.Emit (OpCodes.Ldc_I4_1);
+ else
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+ }
+
+ public override Constant Increment ()
+ {
+ throw new NotSupportedException ();
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return !Value;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return false;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == false; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ return null;
+ }
+
+ }
+
+ public class ByteConstant : IntegralConstant {
+ public readonly byte Value;
+
+ public ByteConstant (byte v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.byte_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new ByteConstant (checked ((byte)(Value + 1)), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return false;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type)
+ return new ShortConstant ((short) Value, Location);
+ if (target_type == TypeManager.ushort_type)
+ return new UShortConstant ((ushort) Value, Location);
+ if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type)
+ return new UIntConstant ((uint) Value, Location);
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type)
+ return new ULongConstant ((ulong) Value, Location);
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type)
+ return new CharConstant ((char) Value, Location);
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class CharConstant : Constant {
+ public readonly char Value;
+
+ public CharConstant (char v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.char_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ static public string descape (char c)
+ {
+ switch (c){
+ case '\a':
+ return "\\a";
+ case '\b':
+ return "\\b";
+ case '\n':
+ return "\\n";
+ case '\t':
+ return "\\t";
+ case '\v':
+ return "\\v";
+ case '\r':
+ return "\\r";
+ case '\\':
+ return "\\\\";
+ case '\f':
+ return "\\f";
+ case '\0':
+ return "\\0";
+ case '"':
+ return "\\\"";
+ case '\'':
+ return "\\\'";
+ }
+ return c.ToString ();
+ }
+
+ public override string AsString ()
+ {
+ return "\"" + descape (Value) + "\"";
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new CharConstant (checked ((char)(Value + 1)), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return false;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == '\0'; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MinValue, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, Int16.MinValue, Int16.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type)
+ return new UIntConstant ((uint) Value, Location);
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type)
+ return new ULongConstant ((ulong) Value, Location);
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class SByteConstant : IntegralConstant {
+ public readonly sbyte Value;
+
+ public SByteConstant (sbyte v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.sbyte_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new SByteConstant (checked((sbyte)(Value + 1)), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type)
+ return new ShortConstant ((short) Value, Location);
+ if (target_type == TypeManager.ushort_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new UShortConstant ((ushort) Value, Location);
+ } if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new UIntConstant ((uint) Value, Location);
+ } if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class ShortConstant : IntegralConstant {
+ public readonly short Value;
+
+ public ShortConstant (short v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.short_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new ShortConstant (checked((short)(Value + 1)), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MinValue, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, Char.MinValue, Char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class UShortConstant : IntegralConstant {
+ public readonly ushort Value;
+
+ public UShortConstant (ushort v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.ushort_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new UShortConstant (checked((ushort)(Value + 1)), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return false;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MinValue, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, Int16.MinValue, Int16.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type)
+ return new UIntConstant ((uint) Value, Location);
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type)
+ return new ULongConstant ((ulong) Value, Location);
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, Char.MinValue, Char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+ }
+
+ public class IntConstant : IntegralConstant {
+ public readonly int Value;
+
+ public IntConstant (int v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.int32_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ static public void EmitInt (ILGenerator ig, int i)
+ {
+ switch (i){
+ case -1:
+ ig.Emit (OpCodes.Ldc_I4_M1);
+ break;
+
+ case 0:
+ ig.Emit (OpCodes.Ldc_I4_0);
+ break;
+
+ case 1:
+ ig.Emit (OpCodes.Ldc_I4_1);
+ break;
+
+ case 2:
+ ig.Emit (OpCodes.Ldc_I4_2);
+ break;
+
+ case 3:
+ ig.Emit (OpCodes.Ldc_I4_3);
+ break;
+
+ case 4:
+ ig.Emit (OpCodes.Ldc_I4_4);
+ break;
+
+ case 5:
+ ig.Emit (OpCodes.Ldc_I4_5);
+ break;
+
+ case 6:
+ ig.Emit (OpCodes.Ldc_I4_6);
+ break;
+
+ case 7:
+ ig.Emit (OpCodes.Ldc_I4_7);
+ break;
+
+ case 8:
+ ig.Emit (OpCodes.Ldc_I4_8);
+ break;
+
+ default:
+ if (i >= -128 && i <= 127){
+ ig.Emit (OpCodes.Ldc_I4_S, (sbyte) i);
+ } else
+ ig.Emit (OpCodes.Ldc_I4, i);
+ break;
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ EmitInt (ec.ig, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new IntConstant (checked(Value + 1), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MinValue, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, Int16.MinValue, Int16.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckRange (inCheckedContext, Value, UInt16.MinValue, UInt16.MaxValue);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ CheckRange (inCheckedContext, Value, UInt32.MinValue, UInt32.MaxValue);
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, Char.MinValue, Char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
- public readonly string Name;
- public readonly string ConstantType;
- public Expression Expr;
- public Attributes OptAttributes;
-
- int mod_flags;
- Location Location;
- public FieldBuilder FieldBuilder;
+ return null;
+ }
+ }
+
+ public class UIntConstant : IntegralConstant {
+ public readonly uint Value;
+
+ public UIntConstant (uint v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.uint32_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ IntLiteral.EmitInt (ec.ig, unchecked ((int) Value));
+ }
- public const int AllowedModifiers =
- Modifiers.NEW |
- Modifiers.PUBLIC |
- Modifiers.PROTECTED |
- Modifiers.INTERNAL |
- Modifiers.PRIVATE;
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
- public Constant (string constant_type, string name, Expression expr, int mod_flags,
- Attributes attrs, Location loc)
+ public override object GetValue ()
{
- this.ConstantType = constant_type;
- this.Name = name;
- this.Expr = expr;
- this.mod_flags = Modifiers.Check (AllowedModifiers, mod_flags, Modifiers.PRIVATE);
- this.Location = loc;
- OptAttributes = attrs;
+ return Value;
}
- public FieldAttributes FieldAttr {
+ public override Constant Increment ()
+ {
+ return new UIntConstant (checked(Value + 1), loc);
+ }
+
+ public override bool IsDefaultValue {
get {
- return FieldAttributes.Literal | FieldAttributes.Static |
- Modifiers.FieldAttr (mod_flags) ;
+ return Value == 0;
}
}
- public int ModFlags {
+ public override bool IsNegative {
get {
- return mod_flags;
+ return false;
}
}
- public override Expression DoResolve (EmitContext ec)
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
{
- // FIXME: implement
- return this;
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Char.MinValue, Char.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, Int16.MinValue, Int16.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckRange (inCheckedContext, Value, UInt16.MinValue, UInt16.MaxValue);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ CheckRange (inCheckedContext, Value, Int32.MinValue, Int32.MaxValue);
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type)
+ return new ULongConstant ((ulong) Value, Location);
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, Char.MinValue, Char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class LongConstant : IntegralConstant {
+ public readonly long Value;
+
+ public LongConstant (long v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.int64_type;
+ eclass = ExprClass.Value;
+ Value = v;
}
public override void Emit (EmitContext ec)
{
- throw new Exception ("Unimplemented");
+ EmitLong (ec.ig, Value);
+ }
+
+ static public void EmitLong (ILGenerator ig, long l)
+ {
+ if (l >= int.MinValue && l <= int.MaxValue) {
+ IntLiteral.EmitInt (ig, unchecked ((int) l));
+ ig.Emit (OpCodes.Conv_I8);
+ return;
+ }
+ ig.Emit (OpCodes.Ldc_I8, l);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
}
- void WarningNotHiding (TypeContainer parent)
+ public override Constant Increment ()
{
- Report.Warning (
- 109, Location,
- "The member `" + parent.Name + "." + Name + "' does not hide an " +
- "inherited member. The keyword new is not required");
+ return new LongConstant (checked(Value + 1), loc);
}
- /// <summary>
- /// Defines the constant in the @parent
- /// </summary>
- public void Define (TypeContainer parent)
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MinValue, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, Int16.MinValue, Int16.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckRange (inCheckedContext, Value, UInt16.MinValue, UInt16.MaxValue);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ CheckRange (inCheckedContext, Value, Int32.MinValue, Int32.MaxValue);
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ CheckRange (inCheckedContext, Value, UInt32.MinValue, UInt32.MaxValue);
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.uint64_type) {
+ CheckUnsigned (inCheckedContext, Value);
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, Char.MinValue, Char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class ULongConstant : IntegralConstant {
+ public readonly ulong Value;
+
+ public ULongConstant (ulong v, Location loc):
+ base (loc)
{
- type = parent.LookupType (ConstantType, true);
+ type = TypeManager.uint64_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
- if (type == null)
- return;
-
- if (!TypeManager.IsBuiltinType (type) && (!type.IsSubclassOf (TypeManager.enum_type))) {
- Report.Error (-3, Location, "Constant type is not valid (only system types are allowed)");
- return;
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ LongLiteral.EmitLong (ig, unchecked ((long) Value));
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new ULongConstant (checked(Value + 1), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return false;
}
+ }
- Type ptype = parent.TypeBuilder.BaseType;
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
- if (ptype != null) {
- MemberInfo [] mi = TypeContainer.FindMembers (ptype, MemberTypes.Field, BindingFlags.Public,
- Type.FilterName, Name);
-
- if (mi == null || mi.Length == 0)
- if ((ModFlags & Modifiers.NEW) != 0)
- WarningNotHiding (parent);
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, (ulong) SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, (ulong) Int16.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckRange (inCheckedContext, Value, UInt16.MaxValue);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ CheckRange (inCheckedContext, Value, Int32.MaxValue);
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ CheckRange (inCheckedContext, Value, UInt32.MaxValue);
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type) {
+ CheckRange (inCheckedContext, Value, (ulong) Int64.MaxValue);
+ return new LongConstant ((long) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, Char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
- } else if ((ModFlags & Modifiers.NEW) != 0)
- WarningNotHiding (parent);
+ }
+
+ public class FloatConstant : Constant {
+ public float Value;
- FieldBuilder = parent.TypeBuilder.DefineField (Name, type, FieldAttr);
+ public FloatConstant (float v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.float_type;
+ eclass = ExprClass.Value;
+ Value = v;
}
-
- /// <summary>
- /// Emits the field value by evaluating the expression
- /// </summary>
- public void EmitConstant (TypeContainer parent)
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldc_R4, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new FloatConstant (checked(Value + 1), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, byte.MinValue, byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, sbyte.MinValue, sbyte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, short.MinValue, short.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckRange (inCheckedContext, Value, ushort.MinValue, ushort.MaxValue);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ CheckRange (inCheckedContext, Value, int.MinValue, int.MaxValue);
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ CheckRange (inCheckedContext, Value, uint.MinValue, uint.MaxValue);
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type) {
+ CheckRange (inCheckedContext, Value, long.MinValue, long.MaxValue);
+ return new LongConstant ((long) Value, Location);
+ }
+ if (target_type == TypeManager.uint64_type) {
+ CheckRange (inCheckedContext, Value, ulong.MinValue, ulong.MaxValue);
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, char.MinValue, char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class DoubleConstant : Constant {
+ public double Value;
+
+ public DoubleConstant (double v, Location loc):
+ base (loc)
+ {
+ type = TypeManager.double_type;
+ eclass = ExprClass.Value;
+ Value = v;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldc_R8, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new DoubleConstant (checked(Value + 1), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ CheckRange (inCheckedContext, Value, Byte.MinValue, Byte.MaxValue);
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ CheckRange (inCheckedContext, Value, SByte.MinValue, SByte.MaxValue);
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ CheckRange (inCheckedContext, Value, short.MinValue, short.MaxValue);
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ CheckRange (inCheckedContext, Value, ushort.MinValue, ushort.MaxValue);
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ CheckRange (inCheckedContext, Value, int.MinValue, int.MaxValue);
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ CheckRange (inCheckedContext, Value, uint.MinValue, uint.MaxValue);
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type) {
+ CheckRange (inCheckedContext, Value, long.MinValue, long.MaxValue);
+ return new LongConstant ((long) Value, Location);
+ }
+ if (target_type == TypeManager.uint64_type) {
+ CheckRange (inCheckedContext, Value, ulong.MinValue, ulong.MaxValue);
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ CheckRange (inCheckedContext, Value, char.MinValue, char.MaxValue);
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class DecimalConstant : Constant {
+ public readonly decimal Value;
+
+ public DecimalConstant (decimal d, Location loc):
+ base (loc)
+ {
+ type = TypeManager.decimal_type;
+ eclass = ExprClass.Value;
+ Value = d;
+ }
+
+ override public string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return (object) Value;
+ }
+
+ public override void Emit (EmitContext ec)
{
- if (FieldBuilder == null)
+ ILGenerator ig = ec.ig;
+
+ int [] words = Decimal.GetBits (Value);
+ int power = (words [3] >> 16) & 0xff;
+
+ if (power == 0 && Value <= int.MaxValue && Value >= int.MinValue)
+ {
+ IntConstant.EmitInt (ig, (int)Value);
+ ig.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_int_arg);
return;
+ }
+
- EmitContext ec = new EmitContext (parent, Location, null, type, ModFlags);
+ //
+ // FIXME: we could optimize this, and call a better
+ // constructor
+ //
- Expr = Expression.Reduce (ec, Expr);
+ IntConstant.EmitInt (ig, words [0]);
+ IntConstant.EmitInt (ig, words [1]);
+ IntConstant.EmitInt (ig, words [2]);
- if (!(Expr is Literal)) {
- Report.Error (150, Location, "A constant value is expected");
- return;
+ // sign
+ IntConstant.EmitInt (ig, words [3] >> 31);
+
+ // power
+ IntConstant.EmitInt (ig, power);
+
+ ig.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_five_args);
+ }
+
+ public override Constant Increment ()
+ {
+ return new DecimalConstant (checked (Value + 1), loc);
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return Value < 0;
}
+ }
- object val = ((Literal) Expr).GetValue ();
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ if (target_type == TypeManager.sbyte_type)
+ return new SByteConstant ((sbyte)Value, loc);
+ if (target_type == TypeManager.byte_type)
+ return new ByteConstant ((byte)Value, loc);
+ if (target_type == TypeManager.short_type)
+ return new ShortConstant ((short)Value, loc);
+ if (target_type == TypeManager.ushort_type)
+ return new UShortConstant ((ushort)Value, loc);
+ if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int)Value, loc);
+ if (target_type == TypeManager.uint32_type)
+ return new UIntConstant ((uint)Value, loc);
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long)Value, loc);
+ if (target_type == TypeManager.uint64_type)
+ return new ULongConstant ((ulong)Value, loc);
+ if (target_type == TypeManager.char_type)
+ return new CharConstant ((char)Value, loc);
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float)Value, loc);
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double)Value, loc);
- FieldBuilder.SetConstant (val);
+ return null;
+ }
- TypeManager.RegisterField (FieldBuilder, val);
-
- return;
+ }
+
+ public class StringConstant : Constant {
+ public readonly string Value;
+
+ public StringConstant (string s, Location loc):
+ base (loc)
+ {
+ type = TypeManager.string_type;
+ eclass = ExprClass.Value;
+ Value = s;
+ }
+
+ // FIXME: Escape the string.
+ override public string AsString ()
+ {
+ return "\"" + Value + "\"";
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ if (Value == null)
+ ec.ig.Emit (OpCodes.Ldnull);
+ else
+ ec.ig.Emit (OpCodes.Ldstr, Value);
+ }
+
+ public override Constant Increment ()
+ {
+ throw new NotSupportedException ();
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == null;
+ }
+ }
+
+ public override bool IsNegative {
+ get {
+ return false;
+ }
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, Type target_type)
+ {
+ return null;
}
}
+
}
projects / mono.git / blobdiff