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SharpDevelop/ICSharpCode.NRefactory.CSharp/Parser/mcs/constant.cs

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//
// constant.cs: Constants.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// Copyright 2001-2003 Ximian, Inc.
// Copyright 2003-2008 Novell, Inc.
// Copyright 2011 Xamarin Inc
//
using System;
using System.Globalization;
#if STATIC
using IKVM.Reflection.Emit;
#else
using System.Reflection.Emit;
#endif
namespace Mono.CSharp {
/// <summary>
/// Base class for constants and literals.
/// </summary>
public abstract class Constant : Expression
{
static readonly NumberFormatInfo nfi = CultureInfo.InvariantCulture.NumberFormat;
protected Constant (Location loc)
{
this.loc = loc;
}
override public string ToString ()
{
return this.GetType ().Name + " (" + GetValueAsLiteral () + ")";
}
/// <summary>
/// This is used to obtain the actual value of the literal
/// cast into an object.
/// </summary>
public abstract object GetValue ();
public abstract long GetValueAsLong ();
public abstract string GetValueAsLiteral ();
#if !STATIC
//
// Returns an object value which is typed to contant type
//
public virtual object GetTypedValue ()
{
return GetValue ();
}
#endif
public override void Error_ValueCannotBeConverted (ResolveContext ec, TypeSpec target, bool expl)
{
if (!expl && IsLiteral &&
BuiltinTypeSpec.IsPrimitiveTypeOrDecimal (target) &&
BuiltinTypeSpec.IsPrimitiveTypeOrDecimal (type)) {
ec.Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
GetValueAsLiteral (), target.GetSignatureForError ());
} else {
base.Error_ValueCannotBeConverted (ec, target, expl);
}
}
public Constant ImplicitConversionRequired (ResolveContext ec, TypeSpec type, Location loc)
{
Constant c = ConvertImplicitly (type);
if (c == null)
Error_ValueCannotBeConverted (ec, type, false);
return c;
}
public override bool ContainsEmitWithAwait ()
{
return false;
}
public virtual Constant ConvertImplicitly (TypeSpec type)
{
if (this.type == type)
return this;
if (Convert.ImplicitNumericConversion (this, type) == null)
return null;
bool fail;
object constant_value = ChangeType (GetValue (), type, out fail);
if (fail){
//
// We should always catch the error before this is ever
// reached, by calling Convert.ImplicitStandardConversionExists
//
throw new InternalErrorException ("Missing constant conversion between `{0}' and `{1}'",
Type.GetSignatureForError (), type.GetSignatureForError ());
}
return CreateConstantFromValue (type, constant_value, loc);
}
//
// Returns a constant instance based on Type
//
public static Constant CreateConstantFromValue (TypeSpec t, object v, Location loc)
{
switch (t.BuiltinType) {
case BuiltinTypeSpec.Type.Int:
return new IntConstant (t, (int) v, loc);
case BuiltinTypeSpec.Type.String:
return new StringConstant (t, (string) v, loc);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (t, (uint) v, loc);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (t, (long) v, loc);
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (t, (ulong) v, loc);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (t, (float) v, loc);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (t, (double) v, loc);
case BuiltinTypeSpec.Type.Short:
return new ShortConstant (t, (short) v, loc);
case BuiltinTypeSpec.Type.UShort:
return new UShortConstant (t, (ushort) v, loc);
case BuiltinTypeSpec.Type.SByte:
return new SByteConstant (t, (sbyte) v, loc);
case BuiltinTypeSpec.Type.Byte:
return new ByteConstant (t, (byte) v, loc);
case BuiltinTypeSpec.Type.Char:
return new CharConstant (t, (char) v, loc);
case BuiltinTypeSpec.Type.Bool:
return new BoolConstant (t, (bool) v, loc);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (t, (decimal) v, loc);
}
if (t.IsEnum) {
var real_type = EnumSpec.GetUnderlyingType (t);
return new EnumConstant (CreateConstantFromValue (real_type, v, loc), t);
}
if (v == null) {
if (t.IsNullableType)
return Nullable.LiftedNull.Create (t, loc);
if (TypeSpec.IsReferenceType (t))
return new NullConstant (t, loc);
}
#if STATIC
throw new InternalErrorException ("Constant value `{0}' has unexpected underlying type `{1}'", v, t.GetSignatureForError ());
#else
return null;
#endif
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (this));
args.Add (new Argument (new TypeOf (type, loc)));
return CreateExpressionFactoryCall (ec, "Constant", args);
}
/// <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 in_checked_context, TypeSpec target_type);
// This is a custom version of Convert.ChangeType() which works
// with the TypeBuilder defined types when compiling corlib.
static object ChangeType (object value, TypeSpec targetType, out bool error)
{
IConvertible convert_value = value as IConvertible;
if (convert_value == null) {
error = true;
return null;
}
//
// We cannot rely on build-in type conversions as they are
// more limited than what C# supports.
// See char -> float/decimal/double conversion
//
error = false;
try {
switch (targetType.BuiltinType) {
case BuiltinTypeSpec.Type.Bool:
return convert_value.ToBoolean (nfi);
case BuiltinTypeSpec.Type.Byte:
return convert_value.ToByte (nfi);
case BuiltinTypeSpec.Type.Char:
return convert_value.ToChar (nfi);
case BuiltinTypeSpec.Type.Short:
return convert_value.ToInt16 (nfi);
case BuiltinTypeSpec.Type.Int:
return convert_value.ToInt32 (nfi);
case BuiltinTypeSpec.Type.Long:
return convert_value.ToInt64 (nfi);
case BuiltinTypeSpec.Type.SByte:
return convert_value.ToSByte (nfi);
case BuiltinTypeSpec.Type.Decimal:
if (convert_value.GetType () == typeof (char))
return (decimal) convert_value.ToInt32 (nfi);
return convert_value.ToDecimal (nfi);
case BuiltinTypeSpec.Type.Double:
if (convert_value.GetType () == typeof (char))
return (double) convert_value.ToInt32 (nfi);
return convert_value.ToDouble (nfi);
case BuiltinTypeSpec.Type.Float:
if (convert_value.GetType () == typeof (char))
return (float) convert_value.ToInt32 (nfi);
return convert_value.ToSingle (nfi);
case BuiltinTypeSpec.Type.String:
return convert_value.ToString (nfi);
case BuiltinTypeSpec.Type.UShort:
return convert_value.ToUInt16 (nfi);
case BuiltinTypeSpec.Type.UInt:
return convert_value.ToUInt32 (nfi);
case BuiltinTypeSpec.Type.ULong:
return convert_value.ToUInt64 (nfi);
case BuiltinTypeSpec.Type.Object:
return value;
}
} catch {
}
error = true;
return null;
}
protected override Expression DoResolve (ResolveContext rc)
{
return this;
}
//
// Attempts to do a compile-time folding of a constant cast and handles
// error reporting for constant overlows only, on normal conversion
// errors returns null
//
public Constant Reduce (ResolveContext ec, TypeSpec target_type)
{
try {
return TryReduceConstant (ec, target_type);
} catch (OverflowException) {
if (ec.ConstantCheckState && Type.BuiltinType != BuiltinTypeSpec.Type.Decimal) {
ec.Report.Error (221, loc,
"Constant value `{0}' cannot be converted to a `{1}' (use `unchecked' syntax to override)",
GetValueAsLiteral (), target_type.GetSignatureForError ());
} else {
Error_ValueCannotBeConverted (ec, target_type, false);
}
return New.Constantify (target_type, loc);
}
}
public Constant TryReduce (ResolveContext rc, TypeSpec targetType)
{
try {
return TryReduceConstant (rc, targetType);
} catch (OverflowException) {
return null;
}
}
Constant TryReduceConstant (ResolveContext ec, TypeSpec target_type)
{
if (Type == target_type) {
//
// Reducing literal value produces a new constant. Syntactically 10 is not same as (int)10
//
if (IsLiteral)
return CreateConstantFromValue (target_type, GetValue (), loc);
return this;
}
Constant c;
if (target_type.IsEnum) {
c = TryReduceConstant (ec, EnumSpec.GetUnderlyingType (target_type));
if (c == null)
return null;
return new EnumConstant (c, target_type);
}
return ConvertExplicitly (ec.ConstantCheckState, target_type);
}
/// <summary>
/// Need to pass type as the constant can require a boxing
/// and in such case no optimization is possible
/// </summary>
public bool IsDefaultInitializer (TypeSpec type)
{
if (type == Type)
return IsDefaultValue;
return this is NullLiteral;
}
public abstract bool IsDefaultValue {
get;
}
public abstract bool IsNegative {
get;
}
//
// When constant is declared as literal
//
public virtual bool IsLiteral {
get { return false; }
}
public virtual bool IsOneInteger {
get { return false; }
}
public override bool IsSideEffectFree {
get {
return true;
}
}
//
// 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 override void EmitSideEffect (EmitContext ec)
{
// do nothing
}
public sealed override Expression Clone (CloneContext clonectx)
{
// No cloning is not needed for constants
return this;
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
throw new NotSupportedException ("should not be reached");
}
public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
{
#if STATIC
return base.MakeExpression (ctx);
#else
return System.Linq.Expressions.Expression.Constant (GetTypedValue (), type.GetMetaInfo ());
#endif
}
public new bool Resolve (ResolveContext rc)
{
// It exists only as hint not to call Resolve on constants
return true;
}
public override object Accept (StructuralVisitor visitor)
{
return visitor.Visit (this);
}
}
public abstract class IntegralConstant : Constant
{
protected IntegralConstant (TypeSpec type, Location loc)
: base (loc)
{
this.type = type;
eclass = ExprClass.Value;
}
public override void Error_ValueCannotBeConverted (ResolveContext ec, TypeSpec target, bool expl)
{
try {
ConvertExplicitly (true, target);
base.Error_ValueCannotBeConverted (ec, target, expl);
}
catch
{
ec.Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
GetValue ().ToString (), target.GetSignatureForError ());
}
}
public override string GetValueAsLiteral ()
{
return GetValue ().ToString ();
}
public abstract Constant Increment ();
}
public class BoolConstant : Constant {
public readonly bool Value;
public BoolConstant (BuiltinTypes types, bool val, Location loc)
: this (types.Bool, val, loc)
{
}
public BoolConstant (TypeSpec type, bool val, Location loc)
: base (loc)
{
eclass = ExprClass.Value;
this.type = type;
Value = val;
}
public override object GetValue ()
{
return (object) Value;
}
public override string GetValueAsLiteral ()
{
return Value ? "true" : "false";
}
public override long GetValueAsLong ()
{
return Value ? 1 : 0;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
if (Value)
ec.EmitInt (1);
else
ec.EmitInt (0);
}
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 in_checked_context, TypeSpec target_type)
{
return null;
}
}
public class ByteConstant : IntegralConstant
{
public readonly byte Value;
public ByteConstant (BuiltinTypes types, byte v, Location loc)
: this (types.Byte, v, loc)
{
}
public ByteConstant (TypeSpec type, byte v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (Value);
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new ByteConstant (type, checked ((byte)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context){
if (Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class CharConstant : Constant {
public readonly char Value;
public CharConstant (BuiltinTypes types, char v, Location loc)
: this (types.Char, v, loc)
{
}
public CharConstant (TypeSpec type, char v, Location loc)
: base (loc)
{
this.type = type;
eclass = ExprClass.Value;
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode ((ushort) Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (Value);
}
static 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 object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override string GetValueAsLiteral ()
{
return "\"" + descape (Value) + "\"";
}
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 in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < Byte.MinValue || Value > Byte.MaxValue)
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value > Int16.MaxValue)
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.Int:
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class SByteConstant : IntegralConstant
{
public readonly sbyte Value;
public SByteConstant (BuiltinTypes types, sbyte v, Location loc)
: this (types.SByte, v, loc)
{
}
public SByteConstant (TypeSpec type, sbyte v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (Value);
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new SByteConstant (type, checked((sbyte)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.Short:
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class ShortConstant : IntegralConstant {
public readonly short Value;
public ShortConstant (BuiltinTypes types, short v, Location loc)
: this (types.Short, v, loc)
{
}
public ShortConstant (TypeSpec type, short v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (Value);
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new ShortConstant (type, 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 bool IsOneInteger {
get {
return Value == 1;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < Byte.MinValue || Value > Byte.MaxValue)
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value < SByte.MinValue || Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value < Char.MinValue)
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class UShortConstant : IntegralConstant
{
public readonly ushort Value;
public UShortConstant (BuiltinTypes types, ushort v, Location loc)
: this (types.UShort, v, loc)
{
}
public UShortConstant (TypeSpec type, ushort v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (Value);
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new UShortConstant (type, checked((ushort)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value > Byte.MaxValue)
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value > Int16.MaxValue)
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.Int:
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value > Char.MaxValue)
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class IntConstant : IntegralConstant
{
public readonly int Value;
public IntConstant (BuiltinTypes types, int v, Location loc)
: this (types.Int, v, loc)
{
}
public IntConstant (TypeSpec type, int v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (Value);
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new IntConstant (type, checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < Byte.MinValue || Value > Byte.MaxValue)
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value < SByte.MinValue || Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value < Int16.MinValue || Value > Int16.MaxValue)
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context) {
if (Value < UInt16.MinValue || Value > UInt16.MaxValue)
throw new OverflowException ();
}
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context) {
if (Value < UInt32.MinValue)
throw new OverflowException ();
}
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value < Char.MinValue || Value > Char.MaxValue)
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
public override Constant ConvertImplicitly (TypeSpec type)
{
if (this.type == type)
return this;
Constant c = TryImplicitIntConversion (type);
if (c != null)
return c; //.Resolve (rc);
return base.ConvertImplicitly (type);
}
/// <summary>
/// Attempts to perform an implicit constant conversion of the IntConstant
/// into a different data type using casts (See Implicit Constant
/// Expression Conversions)
/// </summary>
Constant TryImplicitIntConversion (TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.SByte:
if (Value >= SByte.MinValue && Value <= SByte.MaxValue)
return new SByteConstant (target_type, (sbyte) Value, loc);
break;
case BuiltinTypeSpec.Type.Byte:
if (Value >= Byte.MinValue && Value <= Byte.MaxValue)
return new ByteConstant (target_type, (byte) Value, loc);
break;
case BuiltinTypeSpec.Type.Short:
if (Value >= Int16.MinValue && Value <= Int16.MaxValue)
return new ShortConstant (target_type, (short) Value, loc);
break;
case BuiltinTypeSpec.Type.UShort:
if (Value >= UInt16.MinValue && Value <= UInt16.MaxValue)
return new UShortConstant (target_type, (ushort) Value, loc);
break;
case BuiltinTypeSpec.Type.UInt:
if (Value >= 0)
return new UIntConstant (target_type, (uint) Value, loc);
break;
case BuiltinTypeSpec.Type.ULong:
//
// we can optimize this case: a positive int32
// always fits on a uint64. But we need an opcode
// to do it.
//
if (Value >= 0)
return new ULongConstant (target_type, (ulong) Value, loc);
break;
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, loc);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, loc);
}
return null;
}
}
public class UIntConstant : IntegralConstant {
public readonly uint Value;
public UIntConstant (BuiltinTypes types, uint v, Location loc)
: this (types.UInt, v, loc)
{
}
public UIntConstant (TypeSpec type, uint v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitInt (unchecked ((int) Value));
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new UIntConstant (type, checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < 0 || Value > byte.MaxValue)
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value > Int16.MaxValue)
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context) {
if (Value < UInt16.MinValue || Value > UInt16.MaxValue)
throw new OverflowException ();
}
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
if (in_checked_context) {
if (Value > Int32.MaxValue)
throw new OverflowException ();
}
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value < Char.MinValue || Value > Char.MaxValue)
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class LongConstant : IntegralConstant {
public readonly long Value;
public LongConstant (BuiltinTypes types, long v, Location loc)
: this (types.Long, v, loc)
{
}
public LongConstant (TypeSpec type, long v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitLong (Value);
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return Value;
}
public override Constant Increment ()
{
return new LongConstant (type, checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < Byte.MinValue || Value > Byte.MaxValue)
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value < SByte.MinValue || Value > SByte.MaxValue)
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value < Int16.MinValue || Value > Int16.MaxValue)
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context) {
if (Value < UInt16.MinValue || Value > UInt16.MaxValue)
throw new OverflowException ();
}
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
if (in_checked_context) {
if (Value < Int32.MinValue || Value > Int32.MaxValue)
throw new OverflowException ();
}
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context) {
if (Value < UInt32.MinValue || Value > UInt32.MaxValue)
throw new OverflowException ();
}
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.ULong:
if (in_checked_context && Value < 0)
throw new OverflowException ();
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value < Char.MinValue || Value > Char.MaxValue)
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
public override Constant ConvertImplicitly (TypeSpec type)
{
if (Value >= 0 && type.BuiltinType == BuiltinTypeSpec.Type.ULong) {
return new ULongConstant (type, (ulong) Value, loc);
}
return base.ConvertImplicitly (type);
}
}
public class ULongConstant : IntegralConstant {
public readonly ulong Value;
public ULongConstant (BuiltinTypes types, ulong v, Location loc)
: this (types.ULong, v, loc)
{
}
public ULongConstant (TypeSpec type, ulong v, Location loc)
: base (type, loc)
{
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.EmitLong (unchecked ((long) Value));
}
public override object GetValue ()
{
return Value;
}
public override long GetValueAsLong ()
{
return (long) Value;
}
public override Constant Increment ()
{
return new ULongConstant (type, checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsOneInteger {
get {
return Value == 1;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context && Value > Byte.MaxValue)
throw new OverflowException ();
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context && Value > ((ulong) SByte.MaxValue))
throw new OverflowException ();
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context && Value > ((ulong) Int16.MaxValue))
throw new OverflowException ();
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context && Value > UInt16.MaxValue)
throw new OverflowException ();
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
if (in_checked_context && Value > UInt32.MaxValue)
throw new OverflowException ();
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context && Value > UInt32.MaxValue)
throw new OverflowException ();
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
if (in_checked_context && Value > Int64.MaxValue)
throw new OverflowException ();
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context && Value > Char.MaxValue)
throw new OverflowException ();
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class FloatConstant : Constant {
public readonly float Value;
public FloatConstant (BuiltinTypes types, float v, Location loc)
: this (types.Float, v, loc)
{
}
public FloatConstant (TypeSpec type, float v, Location loc)
: base (loc)
{
this.type = type;
eclass = ExprClass.Value;
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.Emit (OpCodes.Ldc_R4, Value);
}
public override object GetValue ()
{
return Value;
}
public override string GetValueAsLiteral ()
{
return Value.ToString ();
}
public override long GetValueAsLong ()
{
throw new NotSupportedException ();
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < byte.MinValue || Value > byte.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value < sbyte.MinValue || Value > sbyte.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value < short.MinValue || Value > short.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context) {
if (Value < ushort.MinValue || Value > ushort.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
if (in_checked_context) {
if (Value < int.MinValue || Value > int.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context) {
if (Value < uint.MinValue || Value > uint.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
if (in_checked_context) {
if (Value < long.MinValue || Value > long.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
if (in_checked_context) {
if (Value < ulong.MinValue || Value > ulong.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value < (float) char.MinValue || Value > (float) char.MaxValue || float.IsNaN (Value))
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class DoubleConstant : Constant
{
public readonly double Value;
public DoubleConstant (BuiltinTypes types, double v, Location loc)
: this (types.Double, v, loc)
{
}
public DoubleConstant (TypeSpec type, double v, Location loc)
: base (loc)
{
this.type = type;
eclass = ExprClass.Value;
Value = v;
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
enc.Encode (Value);
}
public override void Emit (EmitContext ec)
{
ec.Emit (OpCodes.Ldc_R8, Value);
}
public override object GetValue ()
{
return Value;
}
public override string GetValueAsLiteral ()
{
return Value.ToString ();
}
public override long GetValueAsLong ()
{
throw new NotSupportedException ();
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.Byte:
if (in_checked_context) {
if (Value < Byte.MinValue || Value > Byte.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new ByteConstant (target_type, (byte) Value, Location);
case BuiltinTypeSpec.Type.SByte:
if (in_checked_context) {
if (Value < SByte.MinValue || Value > SByte.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new SByteConstant (target_type, (sbyte) Value, Location);
case BuiltinTypeSpec.Type.Short:
if (in_checked_context) {
if (Value < short.MinValue || Value > short.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new ShortConstant (target_type, (short) Value, Location);
case BuiltinTypeSpec.Type.UShort:
if (in_checked_context) {
if (Value < ushort.MinValue || Value > ushort.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new UShortConstant (target_type, (ushort) Value, Location);
case BuiltinTypeSpec.Type.Int:
if (in_checked_context) {
if (Value < int.MinValue || Value > int.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new IntConstant (target_type, (int) Value, Location);
case BuiltinTypeSpec.Type.UInt:
if (in_checked_context) {
if (Value < uint.MinValue || Value > uint.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new UIntConstant (target_type, (uint) Value, Location);
case BuiltinTypeSpec.Type.Long:
if (in_checked_context) {
if (Value < long.MinValue || Value > long.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new LongConstant (target_type, (long) Value, Location);
case BuiltinTypeSpec.Type.ULong:
if (in_checked_context) {
if (Value < ulong.MinValue || Value > ulong.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new ULongConstant (target_type, (ulong) Value, Location);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, Location);
case BuiltinTypeSpec.Type.Char:
if (in_checked_context) {
if (Value < (double) char.MinValue || Value > (double) char.MaxValue || double.IsNaN (Value))
throw new OverflowException ();
}
return new CharConstant (target_type, (char) Value, Location);
case BuiltinTypeSpec.Type.Decimal:
return new DecimalConstant (target_type, (decimal) Value, Location);
}
return null;
}
}
public class DecimalConstant : Constant {
public readonly decimal Value;
public DecimalConstant (BuiltinTypes types, decimal d, Location loc)
: this (types.Decimal, d, loc)
{
}
public DecimalConstant (TypeSpec type, decimal d, Location loc)
: base (loc)
{
this.type = type;
eclass = ExprClass.Value;
Value = d;
}
public override void Emit (EmitContext ec)
{
MethodSpec m;
int [] words = decimal.GetBits (Value);
int power = (words [3] >> 16) & 0xff;
if (power == 0) {
if (Value <= int.MaxValue && Value >= int.MinValue) {
m = ec.Module.PredefinedMembers.DecimalCtorInt.Resolve (loc);
if (m == null) {
return;
}
ec.EmitInt ((int) Value);
ec.Emit (OpCodes.Newobj, m);
return;
}
if (Value <= long.MaxValue && Value >= long.MinValue) {
m = ec.Module.PredefinedMembers.DecimalCtorLong.Resolve (loc);
if (m == null) {
return;
}
ec.EmitLong ((long) Value);
ec.Emit (OpCodes.Newobj, m);
return;
}
}
ec.EmitInt (words [0]);
ec.EmitInt (words [1]);
ec.EmitInt (words [2]);
// sign
ec.EmitInt (words [3] >> 31);
// power
ec.EmitInt (power);
m = ec.Module.PredefinedMembers.DecimalCtor.Resolve (loc);
if (m != null) {
ec.Emit (OpCodes.Newobj, m);
}
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
switch (target_type.BuiltinType) {
case BuiltinTypeSpec.Type.SByte:
return new SByteConstant (target_type, (sbyte) Value, loc);
case BuiltinTypeSpec.Type.Byte:
return new ByteConstant (target_type, (byte) Value, loc);
case BuiltinTypeSpec.Type.Short:
return new ShortConstant (target_type, (short) Value, loc);
case BuiltinTypeSpec.Type.UShort:
return new UShortConstant (target_type, (ushort) Value, loc);
case BuiltinTypeSpec.Type.Int:
return new IntConstant (target_type, (int) Value, loc);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (target_type, (uint) Value, loc);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (target_type, (long) Value, loc);
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (target_type, (ulong) Value, loc);
case BuiltinTypeSpec.Type.Char:
return new CharConstant (target_type, (char) Value, loc);
case BuiltinTypeSpec.Type.Float:
return new FloatConstant (target_type, (float) Value, loc);
case BuiltinTypeSpec.Type.Double:
return new DoubleConstant (target_type, (double) Value, loc);
}
return null;
}
public override object GetValue ()
{
return Value;
}
public override string GetValueAsLiteral ()
{
return Value.ToString () + "M";
}
public override long GetValueAsLong ()
{
throw new NotSupportedException ();
}
}
public class StringConstant : Constant {
public readonly string Value;
public StringConstant (BuiltinTypes types, string s, Location loc)
: this (types.String, s, loc)
{
}
public StringConstant (TypeSpec type, string s, Location loc)
: base (loc)
{
this.type = type;
eclass = ExprClass.Value;
Value = s;
}
public override object GetValue ()
{
return Value;
}
public override string GetValueAsLiteral ()
{
// FIXME: Escape the string.
return "\"" + Value + "\"";
}
public override long GetValueAsLong ()
{
throw new NotSupportedException ();
}
public override void Emit (EmitContext ec)
{
if (Value == null) {
ec.EmitNull ();
return;
}
//
// Use string.Empty for both literals and constants even if
// it's not allowed at language level
//
if (Value.Length == 0 && ec.Module.Compiler.Settings.Optimize) {
var string_type = ec.BuiltinTypes.String;
if (ec.CurrentType != string_type) {
var m = ec.Module.PredefinedMembers.StringEmpty.Get ();
if (m != null) {
ec.Emit (OpCodes.Ldsfld, m);
return;
}
}
}
ec.Emit (OpCodes.Ldstr, Value);
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
// cast to object
if (type != targetType)
enc.Encode (type);
enc.Encode (Value);
}
public override bool IsDefaultValue {
get {
return Value == null;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsNull {
get {
return IsDefaultValue;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
return null;
}
}
//
// Null constant can have its own type, think of `default (Foo)'
//
public class NullConstant : Constant
{
public NullConstant (TypeSpec type, Location loc)
: base (loc)
{
eclass = ExprClass.Value;
this.type = type;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
if (type == InternalType.NullLiteral || type.BuiltinType == BuiltinTypeSpec.Type.Object) {
// Optimized version, also avoids referencing literal internal type
Arguments args = new Arguments (1);
args.Add (new Argument (this));
return CreateExpressionFactoryCall (ec, "Constant", args);
}
return base.CreateExpressionTree (ec);
}
public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
{
switch (targetType.BuiltinType) {
case BuiltinTypeSpec.Type.Object:
// Type it as string cast
enc.Encode (rc.Module.Compiler.BuiltinTypes.String);
goto case BuiltinTypeSpec.Type.String;
case BuiltinTypeSpec.Type.String:
case BuiltinTypeSpec.Type.Type:
enc.Encode (byte.MaxValue);
return;
default:
var ac = targetType as ArrayContainer;
if (ac != null && ac.Rank == 1 && !ac.Element.IsArray) {
enc.Encode (uint.MaxValue);
return;
}
break;
}
base.EncodeAttributeValue (rc, enc, targetType);
}
public override void Emit (EmitContext ec)
{
ec.EmitNull ();
// Only to make verifier happy
if (type.IsGenericParameter)
ec.Emit (OpCodes.Unbox_Any, type);
}
public override string ExprClassName {
get {
return GetSignatureForError ();
}
}
public override Constant ConvertExplicitly (bool inCheckedContext, TypeSpec targetType)
{
if (targetType.IsPointer) {
if (IsLiteral || this is NullPointer)
return new NullPointer (targetType, loc);
return null;
}
// Exlude internal compiler types
if (targetType.Kind == MemberKind.InternalCompilerType && targetType.BuiltinType != BuiltinTypeSpec.Type.Dynamic)
return null;
if (!IsLiteral && !Convert.ImplicitStandardConversionExists (this, targetType))
return null;
if (TypeSpec.IsReferenceType (targetType))
return new NullConstant (targetType, loc);
if (targetType.IsNullableType)
return Nullable.LiftedNull.Create (targetType, loc);
return null;
}
public override Constant ConvertImplicitly (TypeSpec targetType)
{
return ConvertExplicitly (false, targetType);
}
public override string GetSignatureForError ()
{
return "null";
}
public override object GetValue ()
{
return null;
}
public override string GetValueAsLiteral ()
{
return GetSignatureForError ();
}
public override long GetValueAsLong ()
{
throw new NotSupportedException ();
}
public override bool IsDefaultValue {
get { return true; }
}
public override bool IsNegative {
get { return false; }
}
public override bool IsNull {
get { return true; }
}
public override bool IsZeroInteger {
get { return true; }
}
}
//
// A null constant in a pointer context
//
class NullPointer : NullConstant
{
public NullPointer (TypeSpec type, Location loc)
: base (type, loc)
{
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Error_PointerInsideExpressionTree (ec);
return base.CreateExpressionTree (ec);
}
public override void Emit (EmitContext ec)
{
//
// Emits null pointer
//
ec.EmitInt (0);
ec.Emit (OpCodes.Conv_U);
}
}
/// <summary>
/// The value is constant, but when emitted has a side effect. This is
/// used by BitwiseAnd to ensure that the second expression is invoked
/// regardless of the value of the left side.
/// </summary>
public class SideEffectConstant : Constant
{
public readonly Constant value;
Expression side_effect;
public SideEffectConstant (Constant value, Expression side_effect, Location loc)
: base (loc)
{
this.value = value;
type = value.Type;
eclass = ExprClass.Value;
while (side_effect is SideEffectConstant)
side_effect = ((SideEffectConstant) side_effect).side_effect;
this.side_effect = side_effect;
}
public override bool IsSideEffectFree {
get {
return false;
}
}
public override object GetValue ()
{
return value.GetValue ();
}
public override string GetValueAsLiteral ()
{
return value.GetValueAsLiteral ();
}
public override long GetValueAsLong ()
{
return value.GetValueAsLong ();
}
public override void Emit (EmitContext ec)
{
side_effect.EmitSideEffect (ec);
value.Emit (ec);
}
public override void EmitSideEffect (EmitContext ec)
{
side_effect.EmitSideEffect (ec);
value.EmitSideEffect (ec);
}
public override bool IsDefaultValue {
get { return value.IsDefaultValue; }
}
public override bool IsNegative {
get { return value.IsNegative; }
}
public override bool IsZeroInteger {
get { return value.IsZeroInteger; }
}
public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
{
Constant new_value = value.ConvertExplicitly (in_checked_context, target_type);
if (new_value == null)
return null;
var c = new SideEffectConstant (new_value, side_effect, new_value.Location);
c.type = target_type;
c.eclass = eclass;
return c;
}
}
}