//
// 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.
//
namespace Mono.CSharp {
using System;
using System.Reflection.Emit;
using System.Collections;
///
/// Base class for constants and literals.
///
public abstract class Constant : Expression {
protected Constant (Location loc)
{
this.loc = loc;
}
///
/// 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.
///
public abstract string AsString ();
override public string ToString ()
{
return this.GetType ().Name + " (" + AsString () + ")";
}
public override bool GetAttributableValue (Type value_type, out object value)
{
if (value_type == TypeManager.object_type) {
value = GetTypedValue ();
return true;
}
Constant c = ImplicitConversionRequired (value_type, loc);
if (c == null) {
value = null;
return false;
}
value = c.GetTypedValue ();
return true;
}
///
/// This is used to obtain the actual value of the literal
/// cast into an object.
///
public abstract object GetValue ();
public virtual object GetTypedValue ()
{
return GetValue ();
}
///
/// Constants are always born in a fully resolved state
///
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override void Error_ValueCannotBeConverted (EmitContext ec, Location loc, Type target, bool expl)
{
if (!expl && IsLiteral && type != TypeManager.string_type && !TypeManager.IsDelegateType (target)) {
Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
GetValue ().ToString (), TypeManager.CSharpName (target));
} else {
base.Error_ValueCannotBeConverted (ec, loc, target, expl);
}
}
public Constant ImplicitConversionRequired (Type type, Location loc)
{
Constant c = ConvertImplicitly (type);
if (c == null)
Error_ValueCannotBeConverted (null, loc, type, false);
return c;
}
public virtual Constant ConvertImplicitly (Type type)
{
if (this.type == type)
return this;
if (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 (type, constant_value, loc);
}
/// Returns a constant instance based on Type
/// The returned value is already resolved.
public static Constant CreateConstant (Type t, object v, Location loc)
{
if (t == TypeManager.int32_type)
return new IntConstant ((int) v, loc);
if (t == TypeManager.string_type)
return new StringConstant ((string) v, loc);
if (t == TypeManager.uint32_type)
return new UIntConstant ((uint) v, loc);
if (t == TypeManager.int64_type)
return new LongConstant ((long) v, loc);
if (t == TypeManager.uint64_type)
return new ULongConstant ((ulong) v, loc);
if (t == TypeManager.float_type)
return new FloatConstant ((float) v, loc);
if (t == TypeManager.double_type)
return new DoubleConstant ((double) v, loc);
if (t == TypeManager.short_type)
return new ShortConstant ((short)v, loc);
if (t == TypeManager.ushort_type)
return new UShortConstant ((ushort)v, loc);
if (t == TypeManager.sbyte_type)
return new SByteConstant ((sbyte)v, loc);
if (t == TypeManager.byte_type)
return new ByteConstant ((byte)v, loc);
if (t == TypeManager.char_type)
return new CharConstant ((char)v, loc);
if (t == TypeManager.bool_type)
return new BoolConstant ((bool) v, loc);
if (t == TypeManager.decimal_type)
return new DecimalConstant ((decimal) v, loc);
if (TypeManager.IsEnumType (t)) {
Type real_type = TypeManager.GetEnumUnderlyingType (t);
return new EnumConstant (CreateConstant (real_type, v, loc), t);
}
if (v == null && !TypeManager.IsValueType (t))
return new EmptyConstantCast (new NullLiteral (loc), t);
throw new Exception ("Unknown type for constant (" + t +
"), details: " + v);
}
public override Expression CreateExpressionTree (EmitContext ec)
{
ArrayList args = new ArrayList (2);
args.Add (new Argument (this));
args.Add (new Argument (
new TypeOf (new TypeExpression (type, loc), loc)));
return CreateExpressionFactoryCall ("Constant", args);
}
///
/// Maybe ConvertTo name is better. It tries to convert `this' constant to target_type.
/// It throws OverflowException
///
// DON'T CALL THIS METHOD DIRECTLY AS IT DOES NOT HANDLE ENUMS
public abstract Constant ConvertExplicitly (bool in_checked_context, Type target_type);
///
/// Attempts to do a compile-time folding of a constant cast.
///
public Constant TryReduce (EmitContext ec, Type target_type, Location loc)
{
try {
return TryReduce (ec, target_type);
}
catch (OverflowException) {
Report.Error (221, loc, "Constant value `{0}' cannot be converted to a `{1}' (use `unchecked' syntax to override)",
GetValue ().ToString (), TypeManager.CSharpName (target_type));
return null;
}
}
Constant TryReduce (EmitContext ec, Type target_type)
{
if (Type == target_type)
return this;
if (TypeManager.IsEnumType (target_type)) {
Constant c = TryReduce (ec, TypeManager.GetEnumUnderlyingType (target_type));
if (c == null)
return null;
return new EnumConstant (c, target_type);
}
return ConvertExplicitly (ec.ConstantCheckState, target_type);
}
public abstract Constant Increment ();
///
/// Need to pass type as the constant can require a boxing
/// and in such case no optimization is possible
///
public bool IsDefaultInitializer (Type type)
{
if (type == Type)
return IsDefaultValue;
return Type == TypeManager.null_type;
}
public abstract bool IsDefaultValue {
get;
}
public abstract bool IsNegative {
get;
}
//
// When constant is declared as literal
//
public virtual bool IsLiteral {
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 abstract class IntegralConstant : Constant {
protected IntegralConstant (Location loc) :
base (loc)
{
}
public override void Error_ValueCannotBeConverted (EmitContext ec, Location loc, Type target, bool expl)
{
try {
ConvertExplicitly (true, target);
base.Error_ValueCannotBeConverted (ec, loc, target, expl);
}
catch
{
Report.Error (31, loc, "Constant value `{0}' cannot be converted to a `{1}'",
GetValue ().ToString (), TypeManager.CSharpName (target));
}
}
}
public class BoolConstant : Constant {
public readonly bool Value;
public BoolConstant (bool val, Location loc):
base (loc)
{
type = TypeManager.bool_type;
eclass = ExprClass.Value;
Value = val;
}
override public string AsString ()
{
return Value ? "true" : "false";
}
public override object GetValue ()
{
return (object) Value;
}
public override void Emit (EmitContext ec)
{
if (Value)
ec.ig.Emit (OpCodes.Ldc_I4_1);
else
ec.ig.Emit (OpCodes.Ldc_I4_0);
}
public override Constant Increment ()
{
throw new NotSupportedException ();
}
public override bool IsDefaultValue {
get {
return !Value;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsZeroInteger {
get { return Value == false; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type target_type)
{
return null;
}
}
public class ByteConstant : IntegralConstant {
public readonly byte Value;
public ByteConstant (byte v, Location loc):
base (loc)
{
type = TypeManager.byte_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
IntLiteral.EmitInt (ec.ig, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new ByteConstant (checked ((byte)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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)
{
type = TypeManager.char_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
IntLiteral.EmitInt (ec.ig, Value);
}
static public string descape (char c)
{
switch (c){
case '\a':
return "\\a";
case '\b':
return "\\b";
case '\n':
return "\\n";
case '\t':
return "\\t";
case '\v':
return "\\v";
case '\r':
return "\\r";
case '\\':
return "\\\\";
case '\f':
return "\\f";
case '\0':
return "\\0";
case '"':
return "\\\"";
case '\'':
return "\\\'";
}
return c.ToString ();
}
public override string AsString ()
{
return "\"" + descape (Value) + "\"";
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new CharConstant (checked ((char)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsZeroInteger {
get { return Value == '\0'; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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.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);
return null;
}
}
public class SByteConstant : IntegralConstant {
public readonly sbyte Value;
public SByteConstant (sbyte v, Location loc):
base (loc)
{
type = TypeManager.sbyte_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
IntLiteral.EmitInt (ec.ig, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new SByteConstant (checked((sbyte)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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);
return null;
}
}
public class ShortConstant : IntegralConstant {
public readonly short Value;
public ShortConstant (short v, Location loc):
base (loc)
{
type = TypeManager.short_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
IntLiteral.EmitInt (ec.ig, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new ShortConstant (checked((short)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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)
{
type = TypeManager.ushort_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
IntLiteral.EmitInt (ec.ig, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new UShortConstant (checked((ushort)(Value + 1)), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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)
{
type = TypeManager.int32_type;
eclass = ExprClass.Value;
Value = v;
}
static public void EmitInt (ILGenerator ig, int i)
{
switch (i){
case -1:
ig.Emit (OpCodes.Ldc_I4_M1);
break;
case 0:
ig.Emit (OpCodes.Ldc_I4_0);
break;
case 1:
ig.Emit (OpCodes.Ldc_I4_1);
break;
case 2:
ig.Emit (OpCodes.Ldc_I4_2);
break;
case 3:
ig.Emit (OpCodes.Ldc_I4_3);
break;
case 4:
ig.Emit (OpCodes.Ldc_I4_4);
break;
case 5:
ig.Emit (OpCodes.Ldc_I4_5);
break;
case 6:
ig.Emit (OpCodes.Ldc_I4_6);
break;
case 7:
ig.Emit (OpCodes.Ldc_I4_7);
break;
case 8:
ig.Emit (OpCodes.Ldc_I4_8);
break;
default:
if (i >= -128 && i <= 127){
ig.Emit (OpCodes.Ldc_I4_S, (sbyte) i);
} else
ig.Emit (OpCodes.Ldc_I4, i);
break;
}
}
public override void Emit (EmitContext ec)
{
EmitInt (ec.ig, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new IntConstant (checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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 (Type type)
{
if (this.type == type)
return this;
Constant c = TryImplicitIntConversion (type);
if (c != null)
return c;
return base.ConvertImplicitly (type);
}
///
/// Attempts to perform an implicit constant conversion of the IntConstant
/// into a different data type using casts (See Implicit Constant
/// Expression Conversions)
///
Constant TryImplicitIntConversion (Type 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)
{
type = TypeManager.uint32_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
IntLiteral.EmitInt (ec.ig, 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 IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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)
{
type = TypeManager.int64_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
EmitLong (ec.ig, Value);
}
static public void EmitLong (ILGenerator ig, long l)
{
if (l >= int.MinValue && l <= int.MaxValue) {
IntLiteral.EmitInt (ig, unchecked ((int) l));
ig.Emit (OpCodes.Conv_I8);
return;
}
if (l >= 0 && l <= uint.MaxValue) {
IntLiteral.EmitInt (ig, unchecked ((int) l));
ig.Emit (OpCodes.Conv_U8);
return;
}
ig.Emit (OpCodes.Ldc_I8, l);
}
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 IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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 (Type type)
{
if (Value >= 0 && type == TypeManager.uint64_type) {
return new ULongConstant ((ulong) Value, loc);
}
return base.ConvertImplicitly (type);
}
}
public class ULongConstant : IntegralConstant {
public readonly ulong Value;
public ULongConstant (ulong v, Location loc):
base (loc)
{
type = TypeManager.uint64_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
LongLiteral.EmitLong (ig, unchecked ((long) Value));
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new ULongConstant (checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override bool IsZeroInteger {
get { return Value == 0; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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)
{
type = TypeManager.float_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldc_R4, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new FloatConstant (checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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 < short.MinValue || Value > short.MaxValue)
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)
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)
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)
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)
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)
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)
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)
{
type = TypeManager.double_type;
eclass = ExprClass.Value;
Value = v;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldc_R8, Value);
}
public override string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return Value;
}
public override Constant Increment ()
{
return new DoubleConstant (checked(Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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 < short.MinValue || Value > short.MaxValue)
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)
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)
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)
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)
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)
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)
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)
{
type = TypeManager.decimal_type;
eclass = ExprClass.Value;
Value = d;
}
override public string AsString ()
{
return Value.ToString ();
}
public override object GetValue ()
{
return (object) Value;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
int [] words = Decimal.GetBits (Value);
int power = (words [3] >> 16) & 0xff;
if (power == 0 && 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;
}
IntConstant.EmitInt (ig, (int)Value);
ig.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_int_arg);
return;
}
//
// FIXME: we could optimize this, and call a better
// constructor
//
IntConstant.EmitInt (ig, words [0]);
IntConstant.EmitInt (ig, words [1]);
IntConstant.EmitInt (ig, words [2]);
// sign
IntConstant.EmitInt (ig, words [3] >> 31);
// power
IntConstant.EmitInt (ig, 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;
}
ig.Emit (OpCodes.Newobj, TypeManager.void_decimal_ctor_five_args);
}
public override Constant Increment ()
{
return new DecimalConstant (checked (Value + 1), loc);
}
public override bool IsDefaultValue {
get {
return Value == 0;
}
}
public override bool IsNegative {
get {
return Value < 0;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, Type target_type)
{
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte)Value, loc);
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte)Value, loc);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short)Value, loc);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort)Value, loc);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int)Value, loc);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint)Value, loc);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long)Value, loc);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong)Value, loc);
if (target_type == TypeManager.char_type)
return new CharConstant ((char)Value, loc);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float)Value, loc);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double)Value, loc);
return null;
}
}
public class StringConstant : Constant {
public readonly string Value;
public StringConstant (string s, Location loc):
base (loc)
{
type = TypeManager.string_type;
eclass = ExprClass.Value;
Value = s;
}
// FIXME: Escape the string.
override public string AsString ()
{
return "\"" + Value + "\"";
}
public override object GetValue ()
{
return Value;
}
public override void Emit (EmitContext ec)
{
if (Value == null)
ec.ig.Emit (OpCodes.Ldnull);
else
ec.ig.Emit (OpCodes.Ldstr, Value);
}
public override Constant Increment ()
{
throw new NotSupportedException ();
}
public override bool IsDefaultValue {
get {
return Value == null;
}
}
public override bool IsNegative {
get {
return false;
}
}
public override Constant ConvertExplicitly (bool in_checked_context, Type target_type)
{
return null;
}
}
///
/// 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.
///
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;
eclass = ExprClass.Value;
type = value.Type;
}
public override string AsString ()
{
return value.AsString ();
}
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 Constant Increment ()
{
throw new NotSupportedException ();
}
public override bool IsNegative {
get { return value.IsNegative; }
}
public override bool IsZeroInteger {
get { return value.IsZeroInteger; }
}
public override Constant ConvertExplicitly (bool in_checked_context, Type 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);
}
}
}