//
-// 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.
-//
+// Copyright 2001-2003 Ximian, Inc.
+// Copyright 2003-2008 Novell, Inc.
//
+using System;
+using System.Reflection.Emit;
+
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 {
+
+ 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 () + ")";
+ }
+
+ /// <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 ();
+ }
+
+ public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, TypeSpec target, bool expl)
+ {
+ if (!expl && IsLiteral &&
+ (TypeManager.IsPrimitiveType (target) || type == TypeManager.decimal_type) &&
+ (TypeManager.IsPrimitiveType (type) || type == TypeManager.decimal_type)) {
+ ec.Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
+ AsString (), TypeManager.CSharpName (target));
+ } else {
+ base.Error_ValueCannotBeConverted (ec, loc, target, expl);
+ }
+ }
+
+ public Constant ImplicitConversionRequired (ResolveContext ec, TypeSpec type, Location loc)
+ {
+ Constant c = ConvertImplicitly (ec, type);
+ if (c == null)
+ Error_ValueCannotBeConverted (ec, loc, type, false);
+
+ return c;
+ }
+
+ public virtual Constant ConvertImplicitly (ResolveContext rc, TypeSpec type)
+ {
+ if (this.type == type)
+ return this;
+
+ 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 InternalErrorException ("Missing constant conversion between `{0}' and `{1}'",
+ TypeManager.CSharpName (Type), TypeManager.CSharpName (type));
+ }
+
+ return CreateConstant (rc, type, constant_value, loc);
+ }
+
+ //
+ // Returns a constant instance based on Type
+ //
+ public static Constant CreateConstant (ResolveContext rc, TypeSpec t, object v, Location loc)
+ {
+ return CreateConstantFromValue (t, v, loc).Resolve (rc);
+ }
+
+ public static Constant CreateConstantFromValue (TypeSpec 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)) {
+ var real_type = EnumSpec.GetUnderlyingType (t);
+ return new EnumConstant (CreateConstantFromValue (real_type, v, loc).Resolve (null), t);
+ }
+ if (v == null) {
+ if (TypeManager.IsNullableType (t))
+ return Nullable.LiftedNull.Create (t, loc);
+
+ if (TypeManager.IsReferenceType (t))
+ return new NullConstant (t, loc);
+ }
+
+ throw new InternalErrorException ("Constant value `{0}' has unexpected underlying type `{1}'",
+ v, TypeManager.CSharpName (t));
+ }
+
+ public override Expression CreateExpressionTree (ResolveContext ec)
+ {
+ Arguments args = new Arguments (2);
+ args.Add (new Argument (this));
+ args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), 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);
+
+ /// <summary>
+ /// Attempts to do a compile-time folding of a constant cast.
+ /// </summary>
+ public Constant TryReduce (ResolveContext ec, TypeSpec target_type, Location loc)
+ {
+ try {
+ return TryReduce (ec, target_type);
+ }
+ catch (OverflowException) {
+ if (ec.ConstantCheckState) {
+ ec.Report.Error (221, loc, "Constant value `{0}' cannot be converted to a `{1}' (use `unchecked' syntax to override)",
+ GetValue ().ToString (), TypeManager.CSharpName (target_type));
+ } else {
+ Error_ValueCannotBeConverted (ec, loc, target_type, false);
+ }
+
+ return New.Constantify (target_type).Resolve (ec);
+ }
+ }
+
+ Constant TryReduce (ResolveContext ec, TypeSpec target_type)
+ {
+ if (Type == target_type)
+ return this;
+
+ Constant c;
+ if (TypeManager.IsEnumType (target_type)) {
+ c = TryReduce (ec, EnumSpec.GetUnderlyingType (target_type));
+ if (c == null)
+ return null;
+
+ return new EnumConstant (c, target_type).Resolve (ec);
+ }
+
+ c = ConvertExplicitly (ec.ConstantCheckState, target_type);
+ if (c != null)
+ c = c.Resolve (ec);
+
+ return c;
+ }
+
+ /// <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; }
+ }
+
+ //
+ // 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
+ }
+
+ protected override void CloneTo (CloneContext clonectx, Expression target)
+ {
+ // CloneTo: Nothing, we do not keep any state on this expression
+ }
+
+ public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
+ {
+ return System.Linq.Expressions.Expression.Constant (GetTypedValue (), type.GetMetaInfo ());
+ }
+
+ public new Constant Resolve (ResolveContext rc)
+ {
+ if (eclass != ExprClass.Unresolved)
+ return this;
+
+ // Resolved constant has to be still a constant
+ Constant c = (Constant) DoResolve (rc);
+ if (c == null)
+ return null;
+
+ if ((c.eclass & ExprClass.Value) == 0) {
+ c.Error_UnexpectedKind (rc, ResolveFlags.VariableOrValue, loc);
+ return null;
+ }
+
+ if (c.type == null)
+ throw new InternalErrorException ("Expression `{0}' did not set its type after Resolve", c.GetType ());
+
+ return c;
+ }
+ }
+
+ public abstract class IntegralConstant : Constant {
+ protected IntegralConstant (Location loc) :
+ base (loc)
+ {
+ }
+
+ public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, TypeSpec target, bool expl)
+ {
+ try {
+ ConvertExplicitly (true, target);
+ base.Error_ValueCannotBeConverted (ec, loc, target, expl);
+ }
+ catch
+ {
+ ec.Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
+ GetValue ().ToString (), TypeManager.CSharpName (target));
+ }
+ }
+
+ public abstract Constant Increment ();
+ }
+
+ public class BoolConstant : Constant {
+ public readonly bool Value;
+
+ public BoolConstant (bool val, Location loc):
+ base (loc)
+ {
+ Value = val;
+ }
+
+ override public string AsString ()
+ {
+ return Value ? "true" : "false";
+ }
+ protected override Expression DoResolve (ResolveContext ec)
+ {
+ type = TypeManager.bool_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
- public class Constant : Expression {
+ public override object GetValue ()
+ {
+ return (object) Value;
+ }
- public readonly string Name;
- public readonly string ConstantType;
- public Expression Expr;
- public Attributes OptAttributes;
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
- int mod_flags;
- Location Location;
- public FieldBuilder FieldBuilder;
+ public override void Emit (EmitContext ec)
+ {
+ if (Value)
+ ec.Emit (OpCodes.Ldc_I4_1);
+ else
+ ec.Emit (OpCodes.Ldc_I4_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 (byte v, Location loc):
+ base (loc)
+ {
+ Value = v;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
- public const int AllowedModifiers =
- Modifiers.NEW |
- Modifiers.PUBLIC |
- Modifiers.PROTECTED |
- Modifiers.INTERNAL |
- Modifiers.PRIVATE;
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitInt (Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ protected override Expression DoResolve (ResolveContext ec)
+ {
+ type = TypeManager.byte_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
- public Constant (string constant_type, string name, Expression expr, int mod_flags,
- Attributes attrs, Location loc)
+ public override Constant Increment ()
{
- 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 new ByteConstant (checked ((byte)(Value + 1)), loc);
}
- public FieldAttributes FieldAttr {
+ public override bool IsDefaultValue {
get {
- return FieldAttributes.Literal | FieldAttributes.Static |
- Modifiers.FieldAttr (mod_flags) ;
+ return Value == 0;
}
}
- public int ModFlags {
+ public override bool IsOneInteger {
+ get {
+ return Value == 1;
+ }
+ }
+
+ 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 in_checked_context, TypeSpec target_type)
+ {
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ 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)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
{
- // FIXME: implement
+ type = TypeManager.char_type;
+ eclass = ExprClass.Value;
return this;
}
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write ((ushort) Value);
+ }
+
public override void Emit (EmitContext ec)
{
- throw new Exception ("Unimplemented");
+ ec.EmitInt (Value);
}
-
- /// <summary>
- /// Defines the constant in the @parent
- /// </summary>
- public void Define (TypeContainer parent)
+
+ static string descape (char c)
{
- type = parent.LookupType (ConstantType, true);
+ 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 ();
+ }
- if (type == null)
- return;
-
- if (!TypeManager.IsBuiltinType (type) && (!type.IsSubclassOf (TypeManager.enum_type))) {
- Report.Error (-3, "Constant type is not valid (only system types are allowed)");
- return;
+ public override string AsString ()
+ {
+ return "\"" + descape (Value) + "\"";
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override bool IsDefaultValue {
+ get {
+ return Value == 0;
}
-
- FieldBuilder = parent.TypeBuilder.DefineField (Name, type, FieldAttr);
}
- /// <summary>
- /// Emits the field value by evaluating the expression
- /// </summary>
- public void EmitConstant (TypeContainer parent)
+ 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)
{
- if (FieldBuilder == null)
- return;
-
- EmitContext ec = new EmitContext (parent, null, type, ModFlags);
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < Byte.MinValue || Value > Byte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value > Int16.MaxValue)
+ throw new OverflowException ();
+ }
+ 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);
- Expr = Expression.Reduce (ec, Expr);
+ return null;
+ }
- if (!(Expr is Literal)) {
- Report.Error (150, Location, "A constant value is expected");
- return;
+ }
+
+ public class SByteConstant : IntegralConstant {
+ public readonly sbyte Value;
+
+ public SByteConstant (sbyte v, Location loc):
+ base (loc)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.sbyte_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitInt (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;
}
+ }
- object val = ((Literal) Expr).GetValue ();
+ public override bool IsNegative {
+ get {
+ return Value < 0;
+ }
+ }
+
+ public override bool IsOneInteger {
+ get {
+ return Value == 1;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
- FieldBuilder.SetConstant (val);
+ public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type)
+ return new ShortConstant ((short) Value, Location);
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ return new UShortConstant ((ushort) Value, Location);
+ } if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ return new UIntConstant ((uint) Value, Location);
+ } if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ 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) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
- TypeManager.RegisterField (FieldBuilder, val);
-
- return;
+ return null;
}
+
}
-}
+ public class ShortConstant : IntegralConstant {
+ public readonly short Value;
+
+ public ShortConstant (short v, Location loc):
+ base (loc)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.short_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitInt (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 bool IsOneInteger {
+ get {
+ return Value == 1;
+ }
+ }
+
+ public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < Byte.MinValue || Value > Byte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value < SByte.MinValue || Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type)
+ return new IntConstant ((int) Value, Location);
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ 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) {
+ if (in_checked_context){
+ if (Value < Char.MinValue)
+ throw new OverflowException ();
+ }
+ 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)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.ushort_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitInt (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 IsOneInteger {
+ get {
+ return Value == 1;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value > Byte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value > Int16.MaxValue)
+ throw new OverflowException ();
+ }
+ 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) {
+ if (in_checked_context){
+ if (Value > Char.MaxValue)
+ throw new OverflowException ();
+ }
+ 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)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.int32_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitInt (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 IsOneInteger {
+ get {
+ return Value == 1;
+ }
+ }
+
+ public override bool IsZeroInteger {
+ get { return Value == 0; }
+ }
+
+ public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < Byte.MinValue || Value > Byte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value < SByte.MinValue || Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value < Int16.MinValue || Value > Int16.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context){
+ if (Value < UInt16.MinValue || Value > UInt16.MaxValue)
+ throw new OverflowException ();
+ }
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context){
+ if (Value < UInt32.MinValue)
+ throw new OverflowException ();
+ }
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type)
+ return new LongConstant ((long) Value, Location);
+ if (target_type == TypeManager.uint64_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ 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) {
+ if (in_checked_context){
+ if (Value < Char.MinValue || Value > Char.MaxValue)
+ throw new OverflowException ();
+ }
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ public override Constant ConvertImplicitly (ResolveContext rc, TypeSpec type)
+ {
+ if (this.type == type)
+ return this;
+
+ Constant c = TryImplicitIntConversion (type);
+ if (c != null)
+ return c.Resolve (rc);
+
+ return base.ConvertImplicitly (rc, 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)
+ {
+ if (target_type == TypeManager.sbyte_type) {
+ if (Value >= SByte.MinValue && Value <= SByte.MaxValue)
+ return new SByteConstant ((sbyte) Value, loc);
+ }
+ else if (target_type == TypeManager.byte_type) {
+ if (Value >= Byte.MinValue && Value <= Byte.MaxValue)
+ return new ByteConstant ((byte) Value, loc);
+ }
+ else if (target_type == TypeManager.short_type) {
+ if (Value >= Int16.MinValue && Value <= Int16.MaxValue)
+ return new ShortConstant ((short) Value, loc);
+ }
+ else if (target_type == TypeManager.ushort_type) {
+ if (Value >= UInt16.MinValue && Value <= UInt16.MaxValue)
+ return new UShortConstant ((ushort) Value, loc);
+ }
+ else if (target_type == TypeManager.uint32_type) {
+ if (Value >= 0)
+ return new UIntConstant ((uint) Value, loc);
+ }
+ else if (target_type == TypeManager.uint64_type) {
+ //
+ // 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 ((ulong) Value, loc);
+ }
+ else if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, loc);
+ else if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, loc);
+
+ return null;
+ }
+ }
+
+ public class UIntConstant : IntegralConstant {
+ public readonly uint Value;
+
+ public UIntConstant (uint v, Location loc):
+ base (loc)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.uint32_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitInt (unchecked ((int) Value));
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new UIntConstant (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)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < Char.MinValue || Value > Char.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value > Int16.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context){
+ if (Value < UInt16.MinValue || Value > UInt16.MaxValue)
+ throw new OverflowException ();
+ }
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ if (in_checked_context){
+ if (Value > Int32.MaxValue)
+ throw new OverflowException ();
+ }
+ 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) {
+ if (in_checked_context){
+ if (Value < Char.MinValue || Value > Char.MaxValue)
+ throw new OverflowException ();
+ }
+ 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)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.int64_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitLong (Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override Constant Increment ()
+ {
+ return new LongConstant (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)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < Byte.MinValue || Value > Byte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value < SByte.MinValue || Value > SByte.MaxValue)
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value < Int16.MinValue || Value > Int16.MaxValue)
+ throw new OverflowException ();
+ }
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context){
+ if (Value < UInt16.MinValue || Value > UInt16.MaxValue)
+ throw new OverflowException ();
+ }
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ if (in_checked_context){
+ if (Value < Int32.MinValue || Value > Int32.MaxValue)
+ throw new OverflowException ();
+ }
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context){
+ if (Value < UInt32.MinValue || Value > UInt32.MaxValue)
+ throw new OverflowException ();
+ }
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.uint64_type) {
+ if (in_checked_context && Value < 0)
+ throw new OverflowException ();
+ 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) {
+ if (in_checked_context){
+ if (Value < Char.MinValue || Value > Char.MaxValue)
+ throw new OverflowException ();
+ }
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ public override Constant ConvertImplicitly (ResolveContext rc, TypeSpec type)
+ {
+ if (Value >= 0 && type == TypeManager.uint64_type) {
+ return new ULongConstant ((ulong) Value, loc).Resolve (rc);
+ }
+
+ return base.ConvertImplicitly (rc, type);
+ }
+ }
+
+ public class ULongConstant : IntegralConstant {
+ public readonly ulong Value;
+
+ public ULongConstant (ulong v, Location loc):
+ base (loc)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.uint64_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.EmitLong (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;
+ }
+ }
+
+ 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)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context && Value > Byte.MaxValue)
+ throw new OverflowException ();
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context && Value > ((ulong) SByte.MaxValue))
+ throw new OverflowException ();
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context && Value > ((ulong) Int16.MaxValue))
+ throw new OverflowException ();
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context && Value > UInt16.MaxValue)
+ throw new OverflowException ();
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ if (in_checked_context && Value > UInt32.MaxValue)
+ throw new OverflowException ();
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context && Value > UInt32.MaxValue)
+ throw new OverflowException ();
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type) {
+ if (in_checked_context && Value > Int64.MaxValue)
+ throw new OverflowException ();
+ 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) {
+ if (in_checked_context && Value > Char.MaxValue)
+ throw new OverflowException ();
+ return new CharConstant ((char) Value, Location);
+ }
+ if (target_type == TypeManager.decimal_type)
+ return new DecimalConstant ((decimal) Value, Location);
+
+ return null;
+ }
+
+ }
+
+ public class FloatConstant : Constant {
+ public float Value;
+
+ public FloatConstant (float v, Location loc):
+ base (loc)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.float_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.Emit (OpCodes.Ldc_R4, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ 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)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < byte.MinValue || Value > byte.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value < sbyte.MinValue || Value > sbyte.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value < short.MinValue || Value > short.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context){
+ if (Value < ushort.MinValue || Value > ushort.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ if (in_checked_context){
+ if (Value < int.MinValue || Value > int.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context){
+ if (Value < uint.MinValue || Value > uint.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type) {
+ if (in_checked_context){
+ if (Value < long.MinValue || Value > long.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new LongConstant ((long) Value, Location);
+ }
+ if (target_type == TypeManager.uint64_type) {
+ if (in_checked_context){
+ if (Value < ulong.MinValue || Value > ulong.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.double_type)
+ return new DoubleConstant ((double) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ if (in_checked_context){
+ if (Value < (float) char.MinValue || Value > (float) char.MaxValue || float.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ 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)
+ {
+ Value = v;
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.double_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ enc.Stream.Write (Value);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.Emit (OpCodes.Ldc_R8, Value);
+ }
+
+ public override string AsString ()
+ {
+ return Value.ToString ();
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ 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)
+ {
+ if (target_type == TypeManager.byte_type) {
+ if (in_checked_context){
+ if (Value < Byte.MinValue || Value > Byte.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new ByteConstant ((byte) Value, Location);
+ }
+ if (target_type == TypeManager.sbyte_type) {
+ if (in_checked_context){
+ if (Value < SByte.MinValue || Value > SByte.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new SByteConstant ((sbyte) Value, Location);
+ }
+ if (target_type == TypeManager.short_type) {
+ if (in_checked_context){
+ if (Value < short.MinValue || Value > short.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new ShortConstant ((short) Value, Location);
+ }
+ if (target_type == TypeManager.ushort_type) {
+ if (in_checked_context){
+ if (Value < ushort.MinValue || Value > ushort.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new UShortConstant ((ushort) Value, Location);
+ }
+ if (target_type == TypeManager.int32_type) {
+ if (in_checked_context){
+ if (Value < int.MinValue || Value > int.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new IntConstant ((int) Value, Location);
+ }
+ if (target_type == TypeManager.uint32_type) {
+ if (in_checked_context){
+ if (Value < uint.MinValue || Value > uint.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new UIntConstant ((uint) Value, Location);
+ }
+ if (target_type == TypeManager.int64_type) {
+ if (in_checked_context){
+ if (Value < long.MinValue || Value > long.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new LongConstant ((long) Value, Location);
+ }
+ if (target_type == TypeManager.uint64_type) {
+ if (in_checked_context){
+ if (Value < ulong.MinValue || Value > ulong.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ return new ULongConstant ((ulong) Value, Location);
+ }
+ if (target_type == TypeManager.float_type)
+ return new FloatConstant ((float) Value, Location);
+ if (target_type == TypeManager.char_type) {
+ if (in_checked_context){
+ if (Value < (double) char.MinValue || Value > (double) char.MaxValue || double.IsNaN (Value))
+ throw new OverflowException ();
+ }
+ 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)
+ {
+ Value = d;
+ }
+
+ override public string AsString ()
+ {
+ return Value.ToString () + "M";
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.decimal_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override object GetValue ()
+ {
+ return (object) Value;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ int [] words = decimal.GetBits (Value);
+ int power = (words [3] >> 16) & 0xff;
+
+ if (power == 0) {
+ if (Value <= int.MaxValue && Value >= int.MinValue) {
+ if (TypeManager.void_decimal_ctor_int_arg == null) {
+ TypeManager.void_decimal_ctor_int_arg = TypeManager.GetPredefinedConstructor (
+ TypeManager.decimal_type, loc, TypeManager.int32_type);
+
+ if (TypeManager.void_decimal_ctor_int_arg == null)
+ return;
+ }
+
+ ec.EmitInt ((int) Value);
+ ec.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_int_arg);
+ return;
+ }
+
+ if (Value <= long.MaxValue && Value >= long.MinValue) {
+ if (TypeManager.void_decimal_ctor_long_arg == null) {
+ TypeManager.void_decimal_ctor_long_arg = TypeManager.GetPredefinedConstructor (
+ TypeManager.decimal_type, loc, TypeManager.int64_type);
+
+ if (TypeManager.void_decimal_ctor_long_arg == null)
+ return;
+ }
+
+ ec.EmitLong ((long) Value);
+ ec.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_long_arg);
+ return;
+ }
+ }
+
+ ec.EmitInt (words [0]);
+ ec.EmitInt (words [1]);
+ ec.EmitInt (words [2]);
+
+ // sign
+ ec.EmitInt (words [3] >> 31);
+
+ // power
+ ec.EmitInt (power);
+
+ if (TypeManager.void_decimal_ctor_five_args == null) {
+ TypeManager.void_decimal_ctor_five_args = TypeManager.GetPredefinedConstructor (
+ TypeManager.decimal_type, loc, TypeManager.int32_type, TypeManager.int32_type,
+ TypeManager.int32_type, TypeManager.bool_type, TypeManager.byte_type);
+
+ if (TypeManager.void_decimal_ctor_five_args == null)
+ return;
+ }
+
+ ec.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_five_args);
+ }
+
+ 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)
+ {
+ 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);
+
+ return null;
+ }
+
+ }
+
+ public class StringConstant : Constant {
+ public readonly string Value;
+
+ public StringConstant (string s, Location loc):
+ base (loc)
+ {
+ Value = s;
+ }
+
+ // FIXME: Escape the string.
+ override public string AsString ()
+ {
+ return "\"" + Value + "\"";
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ type = TypeManager.string_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override object GetValue ()
+ {
+ return Value;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ if (Value == null) {
+ ec.Emit (OpCodes.Ldnull);
+ return;
+ }
+
+ //
+ // Use string.Empty for both literals and constants even if
+ // it's not allowed at language level
+ //
+ if (Value.Length == 0 && RootContext.Optimize && !TypeManager.IsEqual (ec.CurrentType, TypeManager.string_type)) {
+ if (TypeManager.string_empty == null)
+ TypeManager.string_empty = TypeManager.GetPredefinedField (TypeManager.string_type, "Empty", loc, TypeManager.string_type);
+
+ if (TypeManager.string_empty != null) {
+ ec.Emit (OpCodes.Ldsfld, TypeManager.string_empty);
+ 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 string AsString ()
+ {
+ return GetSignatureForError ();
+ }
+
+ public override Expression CreateExpressionTree (ResolveContext ec)
+ {
+ if (type == InternalType.Null || type == TypeManager.object_type) {
+ // 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);
+ }
+
+ protected override Expression DoResolve (ResolveContext ec)
+ {
+ return this;
+ }
+
+ public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType)
+ {
+ // Type it as string cast
+ if (targetType == TypeManager.object_type || targetType == TypeManager.null_type)
+ enc.Encode (TypeManager.string_type);
+
+ var ac = targetType as ArrayContainer;
+ if (ac != null) {
+ if (ac.Rank != 1)
+ base.EncodeAttributeValue (rc, enc, targetType);
+ else
+ enc.Stream.Write (uint.MaxValue);
+ } else {
+ enc.Stream.Write (byte.MaxValue);
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.Emit (OpCodes.Ldnull);
+
+ // Only to make verifier happy
+ if (TypeManager.IsGenericParameter (type))
+ ec.Emit (OpCodes.Unbox_Any, type);
+ }
+
+ public override string ExprClassName {
+ get {
+ return GetSignatureForError ();
+ }
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return "null";
+ }
+
+ public override Constant ConvertExplicitly (bool inCheckedContext, TypeSpec targetType)
+ {
+ if (targetType.IsPointer) {
+ if (IsLiteral || this is NullPointer)
+ return new EmptyConstantCast (new NullPointer (loc), targetType);
+
+ return null;
+ }
+
+ // Exlude internal compiler types
+ if (targetType == InternalType.AnonymousMethod)
+ return null;
+
+ if (!IsLiteral && !Convert.ImplicitStandardConversionExists (this, targetType))
+ return null;
+
+ if (TypeManager.IsReferenceType (targetType))
+ return new NullConstant (targetType, loc);
+
+ if (TypeManager.IsNullableType (targetType))
+ return Nullable.LiftedNull.Create (targetType, loc);
+
+ return null;
+ }
+
+ public override Constant ConvertImplicitly (ResolveContext rc, TypeSpec targetType)
+ {
+ return ConvertExplicitly (false, targetType);
+ }
+
+ public override object GetValue ()
+ {
+ return null;
+ }
+
+ 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; }
+ }
+ }
+
+ /// <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 Constant value;
+ Expression side_effect;
+
+ public SideEffectConstant (Constant value, Expression side_effect, Location loc) : base (loc)
+ {
+ this.value = value;
+ while (side_effect is SideEffectConstant)
+ side_effect = ((SideEffectConstant) side_effect).side_effect;
+ this.side_effect = side_effect;
+ }
+
+ public override string AsString ()
+ {
+ return value.AsString ();
+ }
+
+ protected override Expression DoResolve (ResolveContext rc)
+ {
+ value = value.Resolve (rc);
+
+ type = value.Type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override object GetValue ()
+ {
+ return value.GetValue ();
+ }
+
+ 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);
+ return new_value == null ? null : new SideEffectConstant (new_value, side_effect, new_value.Location);
+ }
+ }
+}
projects / mono.git / blobdiff