/// <summary>
/// Constant expression folder for binary operations.
///
/// Returns null if the expression can not be folded.
/// </summary>
static public Constant BinaryFold (ResolveContext ec, Binary.Operator oper,
Constant left, Constant right, Location loc)
{
Constant result = null;
if (left is EmptyConstantCast)
return BinaryFold (ec, oper, ((EmptyConstantCast)left).child, right, loc);
if (left is SideEffectConstant) {
result = BinaryFold (ec, oper, ((SideEffectConstant) left).value, right, loc);
if (result == null)
return null;
return new SideEffectConstant (result, left, loc);
}
if (right is EmptyConstantCast)
return BinaryFold (ec, oper, left, ((EmptyConstantCast)right).child, loc);
if (right is SideEffectConstant) {
result = BinaryFold (ec, oper, left, ((SideEffectConstant) right).value, loc);
if (result == null)
return null;
return new SideEffectConstant (result, right, loc);
}
TypeSpec lt = left.Type;
TypeSpec rt = right.Type;
bool bool_res;
if (lt.BuiltinType == BuiltinTypeSpec.Type.Bool && lt == rt) {
bool lv = (bool) left.GetValue ();
bool rv = (bool) right.GetValue ();
switch (oper) {
case Binary.Operator.BitwiseAnd:
case Binary.Operator.LogicalAnd:
return new BoolConstant (ec.BuiltinTypes, lv && rv, left.Location);
case Binary.Operator.BitwiseOr:
case Binary.Operator.LogicalOr:
return new BoolConstant (ec.BuiltinTypes, lv || rv, left.Location);
case Binary.Operator.ExclusiveOr:
return new BoolConstant (ec.BuiltinTypes, lv ^ rv, left.Location);
case Binary.Operator.Equality:
return new BoolConstant (ec.BuiltinTypes, lv == rv, left.Location);
case Binary.Operator.Inequality:
return new BoolConstant (ec.BuiltinTypes, lv != rv, left.Location);
}
return null;
}
//
// During an enum evaluation, none of the rules are valid
// Not sure whether it is bug in csc or in documentation
//
if (ec.HasSet (ResolveContext.Options.EnumScope)){
if (left is EnumConstant)
left = ((EnumConstant) left).Child;
if (right is EnumConstant)
right = ((EnumConstant) right).Child;
} else if (left is EnumConstant && rt == lt) {
switch (oper){
///
/// E operator |(E x, E y);
/// E operator &(E x, E y);
/// E operator ^(E x, E y);
///
case Binary.Operator.BitwiseOr:
case Binary.Operator.BitwiseAnd:
case Binary.Operator.ExclusiveOr:
result = BinaryFold (ec, oper, ((EnumConstant)left).Child, ((EnumConstant)right).Child, loc);
if (result != null)
result = result.Reduce (ec, lt);
return result;
///
/// U operator -(E x, E y);
///
case Binary.Operator.Subtraction:
result = BinaryFold (ec, oper, ((EnumConstant)left).Child, ((EnumConstant)right).Child, loc);
if (result != null)
result = result.Reduce (ec, EnumSpec.GetUnderlyingType (lt));
return result;
///
/// bool operator ==(E x, E y);
/// bool operator !=(E x, E y);
/// bool operator <(E x, E y);
/// bool operator >(E x, E y);
/// bool operator <=(E x, E y);
/// bool operator >=(E x, E y);
///
case Binary.Operator.Equality:
case Binary.Operator.Inequality:
case Binary.Operator.LessThan:
case Binary.Operator.GreaterThan:
case Binary.Operator.LessThanOrEqual:
case Binary.Operator.GreaterThanOrEqual:
return BinaryFold(ec, oper, ((EnumConstant)left).Child, ((EnumConstant)right).Child, loc);
}
return null;
}
switch (oper){
case Binary.Operator.BitwiseOr:
//
// bool? operator &(bool? x, bool? y);
//
if ((lt.BuiltinType == BuiltinTypeSpec.Type.Bool && right is NullLiteral) ||
(rt.BuiltinType == BuiltinTypeSpec.Type.Bool && left is NullLiteral)) {
var b = new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
// false | null => null
// null | false => null
if ((right is NullLiteral && left.IsDefaultValue) || (left is NullLiteral && right.IsDefaultValue))
return Nullable.LiftedNull.CreateFromExpression (ec, b);
// true | null => true
// null | true => true
return ReducedExpression.Create (new BoolConstant (ec.BuiltinTypes, true, loc), b);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
if (left is IntConstant){
int res = ((IntConstant) left).Value | ((IntConstant) right).Value;
return new IntConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is UIntConstant){
uint res = ((UIntConstant)left).Value | ((UIntConstant)right).Value;
return new UIntConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is LongConstant){
long res = ((LongConstant)left).Value | ((LongConstant)right).Value;
return new LongConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is ULongConstant){
ulong res = ((ULongConstant)left).Value |
((ULongConstant)right).Value;
return new ULongConstant (ec.BuiltinTypes, res, left.Location);
}
break;
case Binary.Operator.BitwiseAnd:
//
// bool? operator &(bool? x, bool? y);
//
if ((lt.BuiltinType == BuiltinTypeSpec.Type.Bool && right is NullLiteral) ||
(rt.BuiltinType == BuiltinTypeSpec.Type.Bool && left is NullLiteral)) {
var b = new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
// false & null => false
// null & false => false
if ((right is NullLiteral && left.IsDefaultValue) || (left is NullLiteral && right.IsDefaultValue))
return ReducedExpression.Create (new BoolConstant (ec.BuiltinTypes, false, loc), b);
// true & null => null
// null & true => null
return Nullable.LiftedNull.CreateFromExpression (ec, b);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
///
/// int operator &(int x, int y);
/// uint operator &(uint x, uint y);
/// long operator &(long x, long y);
/// ulong operator &(ulong x, ulong y);
///
if (left is IntConstant){
int res = ((IntConstant) left).Value & ((IntConstant) right).Value;
return new IntConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is UIntConstant){
uint res = ((UIntConstant)left).Value & ((UIntConstant)right).Value;
return new UIntConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is LongConstant){
long res = ((LongConstant)left).Value & ((LongConstant)right).Value;
return new LongConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is ULongConstant){
ulong res = ((ULongConstant)left).Value &
((ULongConstant)right).Value;
return new ULongConstant (ec.BuiltinTypes, res, left.Location);
}
break;
case Binary.Operator.ExclusiveOr:
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
if (left is IntConstant){
int res = ((IntConstant) left).Value ^ ((IntConstant) right).Value;
return new IntConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is UIntConstant){
uint res = ((UIntConstant)left).Value ^ ((UIntConstant)right).Value;
return new UIntConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is LongConstant){
long res = ((LongConstant)left).Value ^ ((LongConstant)right).Value;
return new LongConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is ULongConstant){
ulong res = ((ULongConstant)left).Value ^
((ULongConstant)right).Value;
return new ULongConstant (ec.BuiltinTypes, res, left.Location);
}
break;
case Binary.Operator.Addition:
if (lt == InternalType.NullLiteral)
return right;
if (rt == InternalType.NullLiteral)
return left;
//
// If both sides are strings, then concatenate, if
// one is a string, and the other is not, then defer
// to runtime concatenation
//
if (lt.BuiltinType == BuiltinTypeSpec.Type.String || rt.BuiltinType == BuiltinTypeSpec.Type.String){
if (lt == rt)
return new StringConstant (ec.BuiltinTypes, (string)left.GetValue () + (string)right.GetValue (),
left.Location);
return null;
}
//
// handle "E operator + (E x, U y)"
// handle "E operator + (Y y, E x)"
//
EnumConstant lc = left as EnumConstant;
EnumConstant rc = right as EnumConstant;
if (lc != null || rc != null){
if (lc == null) {
lc = rc;
lt = lc.Type;
right = left;
}
// U has to be implicitly convetible to E.base
right = right.ConvertImplicitly (lc.Child.Type);
if (right == null)
return null;
result = BinaryFold (ec, oper, lc.Child, right, loc);
if (result == null)
return null;
result = result.Reduce (ec, lt);
if (result == null)
return null;
return new EnumConstant (result, lt);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
try {
if (left is DoubleConstant){
double res;
if (ec.ConstantCheckState)
res = checked (((DoubleConstant) left).Value +
((DoubleConstant) right).Value);
else
res = unchecked (((DoubleConstant) left).Value +
((DoubleConstant) right).Value);
return new DoubleConstant (ec.BuiltinTypes, res, left.Location);
}
if (left is FloatConstant){
float res;
if (ec.ConstantCheckState)
res = checked (((FloatConstant) left).Value +
((FloatConstant) right).Value);
else
res = unchecked (((FloatConstant) left).Value +
((FloatConstant) right).Value);
result = new FloatConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is ULongConstant){
ulong res;
if (ec.ConstantCheckState)
res = checked (((ULongConstant) left).Value +
((ULongConstant) right).Value);
else
res = unchecked (((ULongConstant) left).Value +
((ULongConstant) right).Value);
result = new ULongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is LongConstant){
long res;
if (ec.ConstantCheckState)
res = checked (((LongConstant) left).Value +
((LongConstant) right).Value);
else
res = unchecked (((LongConstant) left).Value +
((LongConstant) right).Value);
result = new LongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is UIntConstant){
uint res;
if (ec.ConstantCheckState)
res = checked (((UIntConstant) left).Value +
((UIntConstant) right).Value);
else
res = unchecked (((UIntConstant) left).Value +
((UIntConstant) right).Value);
result = new UIntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is IntConstant){
int res;
if (ec.ConstantCheckState)
res = checked (((IntConstant) left).Value +
((IntConstant) right).Value);
else
res = unchecked (((IntConstant) left).Value +
((IntConstant) right).Value);
result = new IntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is DecimalConstant) {
decimal res;
if (ec.ConstantCheckState)
res = checked (((DecimalConstant) left).Value +
((DecimalConstant) right).Value);
else
res = unchecked (((DecimalConstant) left).Value +
((DecimalConstant) right).Value);
result = new DecimalConstant (ec.BuiltinTypes, res, left.Location);
}
} catch (OverflowException){
Error_CompileTimeOverflow (ec, loc);
}
return result;
case Binary.Operator.Subtraction:
//
// handle "E operator - (E x, U y)"
// handle "E operator - (Y y, E x)"
//
lc = left as EnumConstant;
rc = right as EnumConstant;
if (lc != null || rc != null){
if (lc == null) {
lc = rc;
lt = lc.Type;
right = left;
}
// U has to be implicitly convetible to E.base
right = right.ConvertImplicitly (lc.Child.Type);
if (right == null)
return null;
result = BinaryFold (ec, oper, lc.Child, right, loc);
if (result == null)
return null;
result = result.Reduce (ec, lt);
if (result == null)
return null;
return new EnumConstant (result, lt);
}
if (left is NullLiteral && right is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
try {
if (left is DoubleConstant){
double res;
if (ec.ConstantCheckState)
res = checked (((DoubleConstant) left).Value -
((DoubleConstant) right).Value);
else
res = unchecked (((DoubleConstant) left).Value -
((DoubleConstant) right).Value);
result = new DoubleConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is FloatConstant){
float res;
if (ec.ConstantCheckState)
res = checked (((FloatConstant) left).Value -
((FloatConstant) right).Value);
else
res = unchecked (((FloatConstant) left).Value -
((FloatConstant) right).Value);
result = new FloatConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is ULongConstant){
ulong res;
if (ec.ConstantCheckState)
res = checked (((ULongConstant) left).Value -
((ULongConstant) right).Value);
else
res = unchecked (((ULongConstant) left).Value -
((ULongConstant) right).Value);
result = new ULongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is LongConstant){
long res;
if (ec.ConstantCheckState)
res = checked (((LongConstant) left).Value -
((LongConstant) right).Value);
else
res = unchecked (((LongConstant) left).Value -
((LongConstant) right).Value);
result = new LongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is UIntConstant){
uint res;
if (ec.ConstantCheckState)
res = checked (((UIntConstant) left).Value -
((UIntConstant) right).Value);
else
res = unchecked (((UIntConstant) left).Value -
((UIntConstant) right).Value);
result = new UIntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is IntConstant){
int res;
if (ec.ConstantCheckState)
res = checked (((IntConstant) left).Value -
((IntConstant) right).Value);
else
res = unchecked (((IntConstant) left).Value -
((IntConstant) right).Value);
result = new IntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is DecimalConstant) {
decimal res;
if (ec.ConstantCheckState)
res = checked (((DecimalConstant) left).Value -
((DecimalConstant) right).Value);
else
res = unchecked (((DecimalConstant) left).Value -
((DecimalConstant) right).Value);
return new DecimalConstant (ec.BuiltinTypes, res, left.Location);
} else {
throw new Exception ( "Unexepected subtraction input: " + left);
}
} catch (OverflowException){
Error_CompileTimeOverflow (ec, loc);
}
return result;
case Binary.Operator.Multiply:
if (left is NullLiteral && right is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
try {
if (left is DoubleConstant){
double res;
if (ec.ConstantCheckState)
res = checked (((DoubleConstant) left).Value *
((DoubleConstant) right).Value);
else
res = unchecked (((DoubleConstant) left).Value *
((DoubleConstant) right).Value);
return new DoubleConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is FloatConstant){
float res;
if (ec.ConstantCheckState)
res = checked (((FloatConstant) left).Value *
((FloatConstant) right).Value);
else
res = unchecked (((FloatConstant) left).Value *
((FloatConstant) right).Value);
return new FloatConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is ULongConstant){
ulong res;
if (ec.ConstantCheckState)
res = checked (((ULongConstant) left).Value *
((ULongConstant) right).Value);
else
res = unchecked (((ULongConstant) left).Value *
((ULongConstant) right).Value);
return new ULongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is LongConstant){
long res;
if (ec.ConstantCheckState)
res = checked (((LongConstant) left).Value *
((LongConstant) right).Value);
else
res = unchecked (((LongConstant) left).Value *
((LongConstant) right).Value);
return new LongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is UIntConstant){
uint res;
if (ec.ConstantCheckState)
res = checked (((UIntConstant) left).Value *
((UIntConstant) right).Value);
else
res = unchecked (((UIntConstant) left).Value *
((UIntConstant) right).Value);
return new UIntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is IntConstant){
int res;
if (ec.ConstantCheckState)
res = checked (((IntConstant) left).Value *
((IntConstant) right).Value);
else
res = unchecked (((IntConstant) left).Value *
((IntConstant) right).Value);
return new IntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is DecimalConstant) {
decimal res;
if (ec.ConstantCheckState)
res = checked (((DecimalConstant) left).Value *
((DecimalConstant) right).Value);
else
res = unchecked (((DecimalConstant) left).Value *
((DecimalConstant) right).Value);
return new DecimalConstant (ec.BuiltinTypes, res, left.Location);
} else {
throw new Exception ( "Unexepected multiply input: " + left);
}
} catch (OverflowException){
Error_CompileTimeOverflow (ec, loc);
}
break;
case Binary.Operator.Division:
if (left is NullLiteral && right is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
try {
if (left is DoubleConstant){
double res;
if (ec.ConstantCheckState)
res = checked (((DoubleConstant) left).Value /
((DoubleConstant) right).Value);
else
res = unchecked (((DoubleConstant) left).Value /
((DoubleConstant) right).Value);
return new DoubleConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is FloatConstant){
float res;
if (ec.ConstantCheckState)
res = checked (((FloatConstant) left).Value /
((FloatConstant) right).Value);
else
res = unchecked (((FloatConstant) left).Value /
((FloatConstant) right).Value);
return new FloatConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is ULongConstant){
ulong res;
if (ec.ConstantCheckState)
res = checked (((ULongConstant) left).Value /
((ULongConstant) right).Value);
else
res = unchecked (((ULongConstant) left).Value /
((ULongConstant) right).Value);
return new ULongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is LongConstant){
long res;
if (ec.ConstantCheckState)
res = checked (((LongConstant) left).Value /
((LongConstant) right).Value);
else
res = unchecked (((LongConstant) left).Value /
((LongConstant) right).Value);
return new LongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is UIntConstant){
uint res;
if (ec.ConstantCheckState)
res = checked (((UIntConstant) left).Value /
((UIntConstant) right).Value);
else
res = unchecked (((UIntConstant) left).Value /
((UIntConstant) right).Value);
return new UIntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is IntConstant){
int res;
if (ec.ConstantCheckState)
res = checked (((IntConstant) left).Value /
((IntConstant) right).Value);
else
res = unchecked (((IntConstant) left).Value /
((IntConstant) right).Value);
return new IntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is DecimalConstant) {
decimal res;
if (ec.ConstantCheckState)
res = checked (((DecimalConstant) left).Value /
((DecimalConstant) right).Value);
else
res = unchecked (((DecimalConstant) left).Value /
((DecimalConstant) right).Value);
return new DecimalConstant (ec.BuiltinTypes, res, left.Location);
} else {
throw new Exception ( "Unexepected division input: " + left);
}
} catch (OverflowException){
Error_CompileTimeOverflow (ec, loc);
} catch (DivideByZeroException) {
ec.Report.Error (20, loc, "Division by constant zero");
}
break;
case Binary.Operator.Modulus:
if (left is NullLiteral && right is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
try {
if (left is DoubleConstant){
double res;
if (ec.ConstantCheckState)
res = checked (((DoubleConstant) left).Value %
((DoubleConstant) right).Value);
else
res = unchecked (((DoubleConstant) left).Value %
((DoubleConstant) right).Value);
return new DoubleConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is FloatConstant){
float res;
if (ec.ConstantCheckState)
res = checked (((FloatConstant) left).Value %
((FloatConstant) right).Value);
else
res = unchecked (((FloatConstant) left).Value %
((FloatConstant) right).Value);
return new FloatConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is ULongConstant){
ulong res;
if (ec.ConstantCheckState)
res = checked (((ULongConstant) left).Value %
((ULongConstant) right).Value);
else
res = unchecked (((ULongConstant) left).Value %
((ULongConstant) right).Value);
return new ULongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is LongConstant){
long res;
if (ec.ConstantCheckState)
res = checked (((LongConstant) left).Value %
((LongConstant) right).Value);
else
res = unchecked (((LongConstant) left).Value %
((LongConstant) right).Value);
return new LongConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is UIntConstant){
uint res;
if (ec.ConstantCheckState)
res = checked (((UIntConstant) left).Value %
((UIntConstant) right).Value);
else
res = unchecked (((UIntConstant) left).Value %
((UIntConstant) right).Value);
return new UIntConstant (ec.BuiltinTypes, res, left.Location);
} else if (left is IntConstant){
int res;
if (ec.ConstantCheckState)
res = checked (((IntConstant) left).Value %
((IntConstant) right).Value);
else
res = unchecked (((IntConstant) left).Value %
((IntConstant) right).Value);
return new IntConstant (ec.BuiltinTypes, res, left.Location);
} else {
throw new Exception ( "Unexepected modulus input: " + left);
}
} catch (DivideByZeroException){
ec.Report.Error (20, loc, "Division by constant zero");
} catch (OverflowException){
Error_CompileTimeOverflow (ec, loc);
}
break;
//
// There is no overflow checking on left shift
//
case Binary.Operator.LeftShift:
if (left is NullLiteral && right is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
IntConstant ic = right.ConvertImplicitly (ec.BuiltinTypes.Int) as IntConstant;
if (ic == null){
Binary.Error_OperatorCannotBeApplied (ec, left, right, oper, loc);
return null;
}
int lshift_val = ic.Value;
switch (left.Type.BuiltinType) {
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (ec.BuiltinTypes, ((ULongConstant) left).Value << lshift_val, left.Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (ec.BuiltinTypes, ((LongConstant) left).Value << lshift_val, left.Location);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (ec.BuiltinTypes, ((UIntConstant) left).Value << lshift_val, left.Location);
}
// null << value => null
if (left is NullLiteral)
return (Constant) new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
left = left.ConvertImplicitly (ec.BuiltinTypes.Int);
if (left.Type.BuiltinType == BuiltinTypeSpec.Type.Int)
return new IntConstant (ec.BuiltinTypes, ((IntConstant) left).Value << lshift_val, left.Location);
Binary.Error_OperatorCannotBeApplied (ec, left, right, oper, loc);
break;
//
// There is no overflow checking on right shift
//
case Binary.Operator.RightShift:
if (left is NullLiteral && right is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
IntConstant sic = right.ConvertImplicitly (ec.BuiltinTypes.Int) as IntConstant;
if (sic == null){
Binary.Error_OperatorCannotBeApplied (ec, left, right, oper, loc); ;
return null;
}
int rshift_val = sic.Value;
switch (left.Type.BuiltinType) {
case BuiltinTypeSpec.Type.ULong:
return new ULongConstant (ec.BuiltinTypes, ((ULongConstant) left).Value >> rshift_val, left.Location);
case BuiltinTypeSpec.Type.Long:
return new LongConstant (ec.BuiltinTypes, ((LongConstant) left).Value >> rshift_val, left.Location);
case BuiltinTypeSpec.Type.UInt:
return new UIntConstant (ec.BuiltinTypes, ((UIntConstant) left).Value >> rshift_val, left.Location);
}
// null >> value => null
if (left is NullLiteral)
return (Constant) new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
left = left.ConvertImplicitly (ec.BuiltinTypes.Int);
if (left.Type.BuiltinType == BuiltinTypeSpec.Type.Int)
return new IntConstant (ec.BuiltinTypes, ((IntConstant) left).Value >> rshift_val, left.Location);
Binary.Error_OperatorCannotBeApplied (ec, left, right, oper, loc);
break;
case Binary.Operator.Equality:
if (TypeSpec.IsReferenceType (lt) && TypeSpec.IsReferenceType (rt) ||
(left is Nullable.LiftedNull && right.IsNull) ||
(right is Nullable.LiftedNull && left.IsNull)) {
if (left.IsNull || right.IsNull) {
return ReducedExpression.Create (
new BoolConstant (ec.BuiltinTypes, left.IsNull == right.IsNull, left.Location),
new Binary (oper, left, right));
}
if (left is StringConstant && right is StringConstant)
return new BoolConstant (ec.BuiltinTypes,
((StringConstant) left).Value == ((StringConstant) right).Value, left.Location);
return null;
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
bool_res = false;
if (left is DoubleConstant)
bool_res = ((DoubleConstant) left).Value ==
((DoubleConstant) right).Value;
else if (left is FloatConstant)
bool_res = ((FloatConstant) left).Value ==
((FloatConstant) right).Value;
else if (left is ULongConstant)
bool_res = ((ULongConstant) left).Value ==
((ULongConstant) right).Value;
else if (left is LongConstant)
bool_res = ((LongConstant) left).Value ==
((LongConstant) right).Value;
else if (left is UIntConstant)
bool_res = ((UIntConstant) left).Value ==
((UIntConstant) right).Value;
else if (left is IntConstant)
bool_res = ((IntConstant) left).Value ==
((IntConstant) right).Value;
else
return null;
return new BoolConstant (ec.BuiltinTypes, bool_res, left.Location);
case Binary.Operator.Inequality:
if (TypeSpec.IsReferenceType (lt) && TypeSpec.IsReferenceType (rt) ||
(left is Nullable.LiftedNull && right.IsNull) ||
(right is Nullable.LiftedNull && left.IsNull)) {
if (left.IsNull || right.IsNull) {
return ReducedExpression.Create (
new BoolConstant (ec.BuiltinTypes, left.IsNull != right.IsNull, left.Location),
new Binary (oper, left, right));
}
if (left is StringConstant && right is StringConstant)
return new BoolConstant (ec.BuiltinTypes,
((StringConstant) left).Value != ((StringConstant) right).Value, left.Location);
return null;
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
bool_res = false;
if (left is DoubleConstant)
bool_res = ((DoubleConstant) left).Value !=
((DoubleConstant) right).Value;
else if (left is FloatConstant)
bool_res = ((FloatConstant) left).Value !=
((FloatConstant) right).Value;
else if (left is ULongConstant)
bool_res = ((ULongConstant) left).Value !=
((ULongConstant) right).Value;
else if (left is LongConstant)
bool_res = ((LongConstant) left).Value !=
((LongConstant) right).Value;
else if (left is UIntConstant)
bool_res = ((UIntConstant) left).Value !=
((UIntConstant) right).Value;
else if (left is IntConstant)
bool_res = ((IntConstant) left).Value !=
((IntConstant) right).Value;
else
return null;
return new BoolConstant (ec.BuiltinTypes, bool_res, left.Location);
case Binary.Operator.LessThan:
if (right is NullLiteral) {
if (left is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (left is Nullable.LiftedNull) {
return (Constant) new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
}
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
bool_res = false;
if (left is DoubleConstant)
bool_res = ((DoubleConstant) left).Value <
((DoubleConstant) right).Value;
else if (left is FloatConstant)
bool_res = ((FloatConstant) left).Value <
((FloatConstant) right).Value;
else if (left is ULongConstant)
bool_res = ((ULongConstant) left).Value <
((ULongConstant) right).Value;
else if (left is LongConstant)
bool_res = ((LongConstant) left).Value <
((LongConstant) right).Value;
else if (left is UIntConstant)
bool_res = ((UIntConstant) left).Value <
((UIntConstant) right).Value;
else if (left is IntConstant)
bool_res = ((IntConstant) left).Value <
((IntConstant) right).Value;
else
return null;
return new BoolConstant (ec.BuiltinTypes, bool_res, left.Location);
case Binary.Operator.GreaterThan:
if (right is NullLiteral) {
if (left is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (left is Nullable.LiftedNull) {
return (Constant) new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
}
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
bool_res = false;
if (left is DoubleConstant)
bool_res = ((DoubleConstant) left).Value >
((DoubleConstant) right).Value;
else if (left is FloatConstant)
bool_res = ((FloatConstant) left).Value >
((FloatConstant) right).Value;
else if (left is ULongConstant)
bool_res = ((ULongConstant) left).Value >
((ULongConstant) right).Value;
else if (left is LongConstant)
bool_res = ((LongConstant) left).Value >
((LongConstant) right).Value;
else if (left is UIntConstant)
bool_res = ((UIntConstant) left).Value >
((UIntConstant) right).Value;
else if (left is IntConstant)
bool_res = ((IntConstant) left).Value >
((IntConstant) right).Value;
else
return null;
return new BoolConstant (ec.BuiltinTypes, bool_res, left.Location);
case Binary.Operator.GreaterThanOrEqual:
if (right is NullLiteral) {
if (left is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (left is Nullable.LiftedNull) {
return (Constant) new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
}
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
bool_res = false;
if (left is DoubleConstant)
bool_res = ((DoubleConstant) left).Value >=
((DoubleConstant) right).Value;
else if (left is FloatConstant)
bool_res = ((FloatConstant) left).Value >=
((FloatConstant) right).Value;
else if (left is ULongConstant)
bool_res = ((ULongConstant) left).Value >=
((ULongConstant) right).Value;
else if (left is LongConstant)
bool_res = ((LongConstant) left).Value >=
((LongConstant) right).Value;
else if (left is UIntConstant)
bool_res = ((UIntConstant) left).Value >=
((UIntConstant) right).Value;
else if (left is IntConstant)
bool_res = ((IntConstant) left).Value >=
((IntConstant) right).Value;
else
return null;
return new BoolConstant (ec.BuiltinTypes, bool_res, left.Location);
case Binary.Operator.LessThanOrEqual:
if (right is NullLiteral) {
if (left is NullLiteral) {
var lifted_int = new Nullable.NullableType (ec.BuiltinTypes.Int, loc);
lifted_int.ResolveAsType (ec);
return (Constant) new Nullable.LiftedBinaryOperator (oper, lifted_int, right).Resolve (ec);
}
if (left is Nullable.LiftedNull) {
return (Constant) new Nullable.LiftedBinaryOperator (oper, left, right).Resolve (ec);
}
}
if (!DoBinaryNumericPromotions (ec, ref left, ref right))
return null;
bool_res = false;
if (left is DoubleConstant)
bool_res = ((DoubleConstant) left).Value <=
((DoubleConstant) right).Value;
else if (left is FloatConstant)
bool_res = ((FloatConstant) left).Value <=
((FloatConstant) right).Value;
else if (left is ULongConstant)
bool_res = ((ULongConstant) left).Value <=
((ULongConstant) right).Value;
else if (left is LongConstant)
bool_res = ((LongConstant) left).Value <=
((LongConstant) right).Value;
else if (left is UIntConstant)
bool_res = ((UIntConstant) left).Value <=
((UIntConstant) right).Value;
else if (left is IntConstant)
bool_res = ((IntConstant) left).Value <=
((IntConstant) right).Value;
else
return null;
return new BoolConstant (ec.BuiltinTypes, bool_res, left.Location);
}
return null;
}
protected override Expression DoResolve (ResolveContext ec)
{
Child = new IntConstant (ec.BuiltinTypes, (int) (flags | statement.flags), statement.loc);
type = ec.Module.PredefinedTypes.BinderFlags.Resolve ();
eclass = Child.eclass;
return this;
}
protected override bool DoDefineMembers ()
{
if (!base.DoDefineMembers ())
return false;
Location loc = Location;
var equals_parameters = ParametersCompiled.CreateFullyResolved (
new Parameter (new TypeExpression (Compiler.BuiltinTypes.Object, loc), "obj", 0, null, loc), Compiler.BuiltinTypes.Object);
Method equals = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Bool, loc),
Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("Equals", loc),
equals_parameters, null);
equals_parameters[0].Resolve (equals, 0);
Method tostring = new Method (this, new TypeExpression (Compiler.BuiltinTypes.String, loc),
Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN, new MemberName ("ToString", loc),
Mono.CSharpPs.ParametersCompiled.EmptyReadOnlyParameters, null);
ToplevelBlock equals_block = new ToplevelBlock (Compiler, equals.ParameterInfo, loc);
TypeExpr current_type;
if (CurrentTypeParameters != null) {
var targs = new TypeArguments ();
for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
targs.Add (new TypeParameterExpr (CurrentTypeParameters[i], Location));
}
current_type = new GenericTypeExpr (Definition, targs, loc);
} else {
current_type = new TypeExpression (Definition, loc);
}
var li_other = LocalVariable.CreateCompilerGenerated (CurrentType, equals_block, loc);
equals_block.AddStatement (new BlockVariableDeclaration (new TypeExpression (li_other.Type, loc), li_other));
var other_variable = new LocalVariableReference (li_other, loc);
MemberAccess system_collections_generic = new MemberAccess (new MemberAccess (
new QualifiedAliasMember ("global", "System", loc), "Collections", loc), "Generic", loc);
Expression rs_equals = null;
Expression string_concat = new StringConstant (Compiler.BuiltinTypes, "{", loc);
Expression rs_hashcode = new IntConstant (Compiler.BuiltinTypes, -2128831035, loc);
for (int i = 0; i < parameters.Count; ++i) {
var p = parameters [i];
var f = (Field) Members [i * 2];
MemberAccess equality_comparer = new MemberAccess (new MemberAccess (
system_collections_generic, "EqualityComparer",
new TypeArguments (new SimpleName (CurrentTypeParameters [i].Name, loc)), loc),
"Default", loc);
Arguments arguments_equal = new Arguments (2);
arguments_equal.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
arguments_equal.Add (new Argument (new MemberAccess (other_variable, f.Name)));
Expression field_equal = new Invocation (new MemberAccess (equality_comparer,
"Equals", loc), arguments_equal);
Arguments arguments_hashcode = new Arguments (1);
arguments_hashcode.Add (new Argument (new MemberAccess (new This (f.Location), f.Name)));
Expression field_hashcode = new Invocation (new MemberAccess (equality_comparer,
"GetHashCode", loc), arguments_hashcode);
IntConstant FNV_prime = new IntConstant (Compiler.BuiltinTypes, 16777619, loc);
rs_hashcode = new Binary (Binary.Operator.Multiply,
new Binary (Binary.Operator.ExclusiveOr, rs_hashcode, field_hashcode),
FNV_prime);
Expression field_to_string = new Conditional (new BooleanExpression (new Binary (Binary.Operator.Inequality,
new MemberAccess (new This (f.Location), f.Name), new NullLiteral (loc))),
new Invocation (new MemberAccess (
new MemberAccess (new This (f.Location), f.Name), "ToString"), null),
new StringConstant (Compiler.BuiltinTypes, string.Empty, loc), loc);
if (rs_equals == null) {
rs_equals = field_equal;
string_concat = new Binary (Binary.Operator.Addition,
string_concat,
new Binary (Binary.Operator.Addition,
new StringConstant (Compiler.BuiltinTypes, " " + p.Name + " = ", loc),
field_to_string));
continue;
}
//
// Implementation of ToString () body using string concatenation
//
string_concat = new Binary (Binary.Operator.Addition,
new Binary (Binary.Operator.Addition,
string_concat,
new StringConstant (Compiler.BuiltinTypes, ", " + p.Name + " = ", loc)),
field_to_string);
rs_equals = new Binary (Binary.Operator.LogicalAnd, rs_equals, field_equal);
}
string_concat = new Binary (Binary.Operator.Addition,
string_concat,
new StringConstant (Compiler.BuiltinTypes, " }", loc));
//
// Equals (object obj) override
//
var other_variable_assign = new TemporaryVariableReference (li_other, loc);
equals_block.AddStatement (new StatementExpression (
new SimpleAssign (other_variable_assign,
new As (equals_block.GetParameterReference (0, loc),
current_type, loc), loc)));
Expression equals_test = new Binary (Binary.Operator.Inequality, other_variable, new NullLiteral (loc));
if (rs_equals != null)
equals_test = new Binary (Binary.Operator.LogicalAnd, equals_test, rs_equals);
equals_block.AddStatement (new Return (equals_test, loc));
equals.Block = equals_block;
equals.Define ();
Members.Add (equals);
//
// GetHashCode () override
//
Method hashcode = new Method (this, new TypeExpression (Compiler.BuiltinTypes.Int, loc),
Modifiers.PUBLIC | Modifiers.OVERRIDE | Modifiers.DEBUGGER_HIDDEN,
new MemberName ("GetHashCode", loc),
Mono.CSharpPs.ParametersCompiled.EmptyReadOnlyParameters, null);
//
// Modified FNV with good avalanche behavior and uniform
// distribution with larger hash sizes.
//
// const int FNV_prime = 16777619;
// int hash = (int) 2166136261;
// foreach (int d in data)
// hash = (hash ^ d) * FNV_prime;
// hash += hash << 13;
// hash ^= hash >> 7;
// hash += hash << 3;
// hash ^= hash >> 17;
// hash += hash << 5;
ToplevelBlock hashcode_top = new ToplevelBlock (Compiler, loc);
Block hashcode_block = new Block (hashcode_top, loc, loc);
hashcode_top.AddStatement (new Unchecked (hashcode_block, loc));
var li_hash = LocalVariable.CreateCompilerGenerated (Compiler.BuiltinTypes.Int, hashcode_top, loc);
hashcode_block.AddStatement (new BlockVariableDeclaration (new TypeExpression (li_hash.Type, loc), li_hash));
LocalVariableReference hash_variable_assign = new LocalVariableReference (li_hash, loc);
hashcode_block.AddStatement (new StatementExpression (
new SimpleAssign (hash_variable_assign, rs_hashcode)));
var hash_variable = new LocalVariableReference (li_hash, loc);
hashcode_block.AddStatement (new StatementExpression (
new CompoundAssign (Binary.Operator.Addition, hash_variable,
new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 13, loc)))));
hashcode_block.AddStatement (new StatementExpression (
new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 7, loc)))));
hashcode_block.AddStatement (new StatementExpression (
new CompoundAssign (Binary.Operator.Addition, hash_variable,
new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 3, loc)))));
hashcode_block.AddStatement (new StatementExpression (
new CompoundAssign (Binary.Operator.ExclusiveOr, hash_variable,
new Binary (Binary.Operator.RightShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 17, loc)))));
hashcode_block.AddStatement (new StatementExpression (
new CompoundAssign (Binary.Operator.Addition, hash_variable,
new Binary (Binary.Operator.LeftShift, hash_variable, new IntConstant (Compiler.BuiltinTypes, 5, loc)))));
hashcode_block.AddStatement (new Return (hash_variable, loc));
hashcode.Block = hashcode_top;
hashcode.Define ();
Members.Add (hashcode);
//
// ToString () override
//
ToplevelBlock tostring_block = new ToplevelBlock (Compiler, loc);
tostring_block.AddStatement (new Return (string_concat, loc));
tostring.Block = tostring_block;
tostring.Define ();
Members.Add (tostring);
return true;
}