private void GetEnumOperation(BinaryOperatorKind kind, TypeSymbol enumType, ArrayBuilder<BinaryOperatorSignature> operators)
{
Debug.Assert(enumType != null);
if (!enumType.IsValidEnumType())
{
return;
}
var underlying = enumType.GetEnumUnderlyingType();
Debug.Assert(underlying != null);
Debug.Assert(underlying.SpecialType != SpecialType.None);
var nullable = Compilation.GetSpecialType(SpecialType.System_Nullable_T);
var nullableEnum = nullable.Construct(enumType);
var nullableUnderlying = nullable.Construct(underlying);
switch (kind)
{
case BinaryOperatorKind.Addition:
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingAddition, enumType, underlying, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.UnderlyingAndEnumAddition, underlying, enumType, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingAddition, nullableEnum, nullableUnderlying, nullableEnum));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedUnderlyingAndEnumAddition, nullableUnderlying, nullableEnum, nullableEnum));
break;
case BinaryOperatorKind.Subtraction:
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumSubtraction, enumType, enumType, underlying));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingSubtraction, enumType, underlying, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumSubtraction, nullableEnum, nullableEnum, nullableUnderlying));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingSubtraction, nullableEnum, nullableUnderlying, nullableEnum));
break;
case BinaryOperatorKind.Equal:
case BinaryOperatorKind.NotEqual:
case BinaryOperatorKind.GreaterThan:
case BinaryOperatorKind.LessThan:
case BinaryOperatorKind.GreaterThanOrEqual:
case BinaryOperatorKind.LessThanOrEqual:
var boolean = Compilation.GetSpecialType(SpecialType.System_Boolean);
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Enum, enumType, enumType, boolean));
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Lifted | BinaryOperatorKind.Enum, nullableEnum, nullableEnum, boolean));
break;
case BinaryOperatorKind.And:
case BinaryOperatorKind.Or:
case BinaryOperatorKind.Xor:
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Enum, enumType, enumType, enumType));
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Lifted | BinaryOperatorKind.Enum, nullableEnum, nullableEnum, nullableEnum));
break;
}
}
private void GetEnumOperation(BinaryOperatorKind kind, TypeSymbol enumType, BoundExpression left, BoundExpression right, ArrayBuilder<BinaryOperatorSignature> operators)
{
Debug.Assert((object)enumType != null);
AssertNotChecked(kind);
if (!enumType.IsValidEnumType())
{
return;
}
var underlying = enumType.GetEnumUnderlyingType();
Debug.Assert((object)underlying != null);
Debug.Assert(underlying.SpecialType != SpecialType.None);
NamedTypeSymbol nullableEnum = null;
NamedTypeSymbol nullableUnderlying = null;
// PERF: avoid instantiating nullable types in common simple cases.
var leftType = left.Type;
var rightType = right.Type;
var simpleCase = leftType?.IsValueType == true &&
rightType?.IsValueType == true &&
leftType.IsNullableType() == false &&
rightType.IsNullableType() == false;
if (!simpleCase)
{
var nullable = Compilation.GetSpecialType(SpecialType.System_Nullable_T);
nullableEnum = nullable.Construct(enumType);
nullableUnderlying = nullable.Construct(underlying);
}
switch (kind)
{
case BinaryOperatorKind.Addition:
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingAddition, enumType, underlying, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.UnderlyingAndEnumAddition, underlying, enumType, enumType));
if (!simpleCase)
{
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingAddition, nullableEnum, nullableUnderlying, nullableEnum));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedUnderlyingAndEnumAddition, nullableUnderlying, nullableEnum, nullableEnum));
}
break;
case BinaryOperatorKind.Subtraction:
if (Strict)
{
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumSubtraction, enumType, enumType, underlying));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingSubtraction, enumType, underlying, enumType));
if (!simpleCase)
{
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumSubtraction, nullableEnum, nullableEnum, nullableUnderlying));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingSubtraction, nullableEnum, nullableUnderlying, nullableEnum));
}
}
else
{
// SPEC VIOLATION:
// The native compiler has bugs in overload resolution involving binary operator- for enums,
// which we duplicate by hardcoding Priority values among the operators. When present on both
// methods being compared during overload resolution, Priority values are used to decide between
// two candidates (instead of the usual language-specified rules).
bool isExactSubtraction = right.Type?.StrippedType() == underlying;
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumSubtraction, enumType, enumType, underlying)
{ Priority = 2 });
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingSubtraction, enumType, underlying, enumType)
{ Priority = isExactSubtraction ? 1 : 3 });
if (!simpleCase)
{
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumSubtraction, nullableEnum, nullableEnum, nullableUnderlying)
{ Priority = 12 });
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingSubtraction, nullableEnum, nullableUnderlying, nullableEnum)
{ Priority = isExactSubtraction ? 11 : 13 });
}
// Due to a bug, the native compiler allows "underlying - enum", so Roslyn does as well.
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.UnderlyingAndEnumSubtraction, underlying, enumType, enumType)
{ Priority = 4 });
if (!simpleCase)
{
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedUnderlyingAndEnumSubtraction, nullableUnderlying, nullableEnum, nullableEnum)
{ Priority = 14 });
}
}
break;
case BinaryOperatorKind.Equal:
case BinaryOperatorKind.NotEqual:
case BinaryOperatorKind.GreaterThan:
case BinaryOperatorKind.LessThan:
case BinaryOperatorKind.GreaterThanOrEqual:
case BinaryOperatorKind.LessThanOrEqual:
var boolean = Compilation.GetSpecialType(SpecialType.System_Boolean);
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Enum, enumType, enumType, boolean));
if (!simpleCase)
{
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Lifted | BinaryOperatorKind.Enum, nullableEnum, nullableEnum, boolean));
}
break;
case BinaryOperatorKind.And:
case BinaryOperatorKind.Or:
case BinaryOperatorKind.Xor:
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Enum, enumType, enumType, enumType));
if (!simpleCase)
{
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Lifted | BinaryOperatorKind.Enum, nullableEnum, nullableEnum, nullableEnum));
}
break;
}
}
private void GetEnumOperation(BinaryOperatorKind kind, TypeSymbol enumType, ArrayBuilder<BinaryOperatorSignature> operators)
{
Debug.Assert((object)enumType != null);
AssertNotChecked(kind);
if (!enumType.IsValidEnumType())
{
return;
}
var underlying = enumType.GetEnumUnderlyingType();
Debug.Assert((object)underlying != null);
Debug.Assert(underlying.SpecialType != SpecialType.None);
var nullable = Compilation.GetSpecialType(SpecialType.System_Nullable_T);
var nullableEnum = nullable.Construct(enumType);
var nullableUnderlying = nullable.Construct(underlying);
switch (kind)
{
case BinaryOperatorKind.Addition:
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingAddition, enumType, underlying, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.UnderlyingAndEnumAddition, underlying, enumType, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingAddition, nullableEnum, nullableUnderlying, nullableEnum));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedUnderlyingAndEnumAddition, nullableUnderlying, nullableEnum, nullableEnum));
break;
case BinaryOperatorKind.Subtraction:
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumSubtraction, enumType, enumType, underlying));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.EnumAndUnderlyingSubtraction, enumType, underlying, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumSubtraction, nullableEnum, nullableEnum, nullableUnderlying));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedEnumAndUnderlyingSubtraction, nullableEnum, nullableUnderlying, nullableEnum));
// Due to a bug, the native compiler allows "underlying - enum", so Roslyn does as well.
// (In the native compiler codebase look at GetEnumBinOpSigs; the last call to method
// "ValidForEnumAndUnderlyingType" is wrong; it should be a call to "ValidForUnderlyingTypeAndEnum".
// The net result of the bug is that everything that is supposed to work is fine, and we accidentally
// allow underlying - enum because enum - underlying is valid.)
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.UnderlyingAndEnumSubtraction, underlying, enumType, enumType));
operators.Add(new BinaryOperatorSignature(BinaryOperatorKind.LiftedUnderlyingAndEnumSubtraction, nullableUnderlying, nullableEnum, nullableEnum));
break;
case BinaryOperatorKind.Equal:
case BinaryOperatorKind.NotEqual:
case BinaryOperatorKind.GreaterThan:
case BinaryOperatorKind.LessThan:
case BinaryOperatorKind.GreaterThanOrEqual:
case BinaryOperatorKind.LessThanOrEqual:
var boolean = Compilation.GetSpecialType(SpecialType.System_Boolean);
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Enum, enumType, enumType, boolean));
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Lifted | BinaryOperatorKind.Enum, nullableEnum, nullableEnum, boolean));
break;
case BinaryOperatorKind.And:
case BinaryOperatorKind.Or:
case BinaryOperatorKind.Xor:
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Enum, enumType, enumType, enumType));
operators.Add(new BinaryOperatorSignature(kind | BinaryOperatorKind.Lifted | BinaryOperatorKind.Enum, nullableEnum, nullableEnum, nullableEnum));
break;
}
}