private static string GetBinaryOperatorName(BinaryOperatorKind opKind, out bool isChecked, out bool isLifted, out bool requiresLifted)
{
isChecked = opKind.IsChecked();
isLifted = opKind.IsLifted();
requiresLifted = opKind.IsComparison();
switch (opKind.Operator())
{
case BinaryOperatorKind.Addition: return(isChecked ? "AddChecked" : "Add");
case BinaryOperatorKind.Multiplication: return(isChecked ? "MultiplyChecked" : "Multiply");
case BinaryOperatorKind.Subtraction: return(isChecked ? "SubtractChecked" : "Subtract");
case BinaryOperatorKind.Division: return("Divide");
case BinaryOperatorKind.Remainder: return("Modulo");
case BinaryOperatorKind.And: return(opKind.IsLogical() ? "AndAlso" : "And");
case BinaryOperatorKind.Xor: return("ExclusiveOr");
case BinaryOperatorKind.Or: return(opKind.IsLogical() ? "OrElse" : "Or");
case BinaryOperatorKind.LeftShift: return("LeftShift");
case BinaryOperatorKind.RightShift: return("RightShift");
case BinaryOperatorKind.Equal: return("Equal");
case BinaryOperatorKind.NotEqual: return("NotEqual");
case BinaryOperatorKind.LessThan: return("LessThan");
case BinaryOperatorKind.LessThanOrEqual: return("LessThanOrEqual");
case BinaryOperatorKind.GreaterThan: return("GreaterThan");
case BinaryOperatorKind.GreaterThanOrEqual: return("GreaterThanOrEqual");
default:
throw ExceptionUtilities.UnexpectedValue(opKind.Operator());
}
}
private BoundExpression RewriteLiftedBinaryOperator(CSharpSyntaxNode syntax, BinaryOperatorKind operatorKind, BoundExpression loweredLeft, BoundExpression loweredRight, TypeSymbol type, MethodSymbol method)
{
var conditionalLeft = loweredLeft as BoundLoweredConditionalAccess;
// NOTE: we could in theory handle side-effecting loweredRight here too
// by including it as a part of whenNull, but there is a concern
// that it can lead to code duplication
var optimize = conditionalLeft != null &&
!ReadIsSideeffecting(loweredRight) &&
(conditionalLeft.WhenNullOpt == null || conditionalLeft.WhenNullOpt.IsDefaultValue());
if (optimize)
{
loweredLeft = conditionalLeft.WhenNotNull;
}
var result = operatorKind.IsComparison() ?
operatorKind.IsUserDefined() ?
LowerLiftedUserDefinedComparisonOperator(syntax, operatorKind, loweredLeft, loweredRight, method) :
LowerLiftedBuiltInComparisonOperator(syntax, operatorKind, loweredLeft, loweredRight) :
LowerLiftedBinaryArithmeticOperator(syntax, operatorKind, loweredLeft, loweredRight, type, method);
if (optimize)
{
BoundExpression whenNullOpt = null;
// for all operators null-in means null-out
// except for the Equal/NotEqual since null == null ==> true
if (operatorKind.Operator() == BinaryOperatorKind.NotEqual ||
operatorKind.Operator() == BinaryOperatorKind.Equal)
{
whenNullOpt = RewriteLiftedBinaryOperator(syntax, operatorKind, _factory.Default(loweredLeft.Type), loweredRight, type, method);
}
result = conditionalLeft.Update(
conditionalLeft.Receiver,
conditionalLeft.HasValueMethodOpt,
whenNotNull: result,
whenNullOpt: whenNullOpt,
id: conditionalLeft.Id,
type: result.Type
);
}
return result;
}
private string GetBinaryOperatorName(BinaryOperatorKind opKind, out bool isChecked, out bool isLifted, out bool requiresLifted)
{
isChecked = opKind.IsChecked();
isLifted = opKind.IsLifted();
requiresLifted = opKind.IsComparison();
switch (opKind.Operator())
{
case BinaryOperatorKind.Addition: return isChecked ? "AddChecked" : "Add";
case BinaryOperatorKind.Multiplication: return isChecked ? "MultiplyChecked" : "Multiply";
case BinaryOperatorKind.Subtraction: return isChecked ? "SubtractChecked" : "Subtract";
case BinaryOperatorKind.Division: return "Divide";
case BinaryOperatorKind.Remainder: return "Modulo";
case BinaryOperatorKind.And: return opKind.IsLogical() ? "AndAlso" : "And";
case BinaryOperatorKind.Xor: return "ExclusiveOr";
case BinaryOperatorKind.Or: return opKind.IsLogical() ? "OrElse" : "Or";
case BinaryOperatorKind.LeftShift: return "LeftShift";
case BinaryOperatorKind.RightShift: return "RightShift";
case BinaryOperatorKind.Equal: return "Equal";
case BinaryOperatorKind.NotEqual: return "NotEqual";
case BinaryOperatorKind.LessThan: return "LessThan";
case BinaryOperatorKind.LessThanOrEqual: return "LessThanOrEqual";
case BinaryOperatorKind.GreaterThan: return "GreaterThan";
case BinaryOperatorKind.GreaterThanOrEqual: return "GreaterThanOrEqual";
default:
throw ExceptionUtilities.UnexpectedValue(opKind.Operator());
}
}
private BoundExpression MakeBinaryOperator(
BoundBinaryOperator oldNode,
CSharpSyntaxNode syntax,
BinaryOperatorKind operatorKind,
BoundExpression loweredLeft,
BoundExpression loweredRight,
TypeSymbol type,
MethodSymbol method,
bool isPointerElementAccess = false,
bool isCompoundAssignment = false,
BoundUnaryOperator applyParentUnaryOperator = null)
{
Debug.Assert(oldNode == null || (oldNode.Syntax == syntax));
if (inExpressionLambda)
{
switch (operatorKind.Operator() | operatorKind.OperandTypes())
{
case BinaryOperatorKind.ObjectAndStringConcatenation:
case BinaryOperatorKind.StringAndObjectConcatenation:
case BinaryOperatorKind.StringConcatenation:
return RewriteStringConcatenation(syntax, operatorKind, loweredLeft, loweredRight, type);
case BinaryOperatorKind.DelegateCombination:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__Combine);
case BinaryOperatorKind.DelegateRemoval:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__Remove);
case BinaryOperatorKind.DelegateEqual:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__op_Equality);
case BinaryOperatorKind.DelegateNotEqual:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__op_Inequality);
}
}
else if (operatorKind.IsDynamic())
{
Debug.Assert((object)method == null);
Debug.Assert(!isPointerElementAccess);
if (operatorKind.IsLogical())
{
return MakeDynamicLogicalBinaryOperator(syntax, operatorKind, loweredLeft, loweredRight, type, isCompoundAssignment, applyParentUnaryOperator);
}
else
{
return dynamicFactory.MakeDynamicBinaryOperator(operatorKind, loweredLeft, loweredRight, isCompoundAssignment, type).ToExpression();
}
}
else if (operatorKind.IsUserDefined())
{
return LowerUserDefinedBinaryOperator(syntax, operatorKind, loweredLeft, loweredRight, type, method);
}
else if (operatorKind.IsLifted())
{
if (operatorKind.IsComparison())
{
return LowerLiftedBuiltInComparisonOperator(syntax, operatorKind, loweredLeft, loweredRight);
}
else
{
return LowerLiftedBinaryArithmeticOperator(syntax, operatorKind, loweredLeft, loweredRight, type, method);
}
}
else
{
switch (operatorKind.OperatorWithLogical() | operatorKind.OperandTypes())
{
case BinaryOperatorKind.NullableNullEqual:
case BinaryOperatorKind.NullableNullNotEqual:
return RewriteNullableNullEquality(syntax, operatorKind, loweredLeft, loweredRight, type);
case BinaryOperatorKind.ObjectAndStringConcatenation:
case BinaryOperatorKind.StringAndObjectConcatenation:
case BinaryOperatorKind.StringConcatenation:
return RewriteStringConcatenation(syntax, operatorKind, loweredLeft, loweredRight, type);
case BinaryOperatorKind.StringEqual:
return RewriteStringEquality(oldNode, syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_String__op_Equality);
case BinaryOperatorKind.StringNotEqual:
return RewriteStringEquality(oldNode, syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_String__op_Inequality);
case BinaryOperatorKind.DelegateCombination:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__Combine);
case BinaryOperatorKind.DelegateRemoval:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__Remove);
case BinaryOperatorKind.DelegateEqual:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__op_Equality);
case BinaryOperatorKind.DelegateNotEqual:
return RewriteDelegateOperation(syntax, operatorKind, loweredLeft, loweredRight, type, SpecialMember.System_Delegate__op_Inequality);
case BinaryOperatorKind.LogicalBoolAnd:
if (loweredRight.ConstantValue == ConstantValue.True) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.True) return loweredRight;
if (loweredLeft.ConstantValue == ConstantValue.False) return loweredLeft;
if (loweredRight.Kind == BoundKind.Local || loweredRight.Kind == BoundKind.Parameter)
{
operatorKind &= ~BinaryOperatorKind.Logical;
}
goto default;
case BinaryOperatorKind.LogicalBoolOr:
if (loweredRight.ConstantValue == ConstantValue.False) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.False) return loweredRight;
if (loweredLeft.ConstantValue == ConstantValue.True) return loweredLeft;
if (loweredRight.Kind == BoundKind.Local || loweredRight.Kind == BoundKind.Parameter)
{
operatorKind &= ~BinaryOperatorKind.Logical;
}
goto default;
case BinaryOperatorKind.BoolAnd:
if (loweredRight.ConstantValue == ConstantValue.True) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.True) return loweredRight;
goto default;
case BinaryOperatorKind.BoolOr:
if (loweredRight.ConstantValue == ConstantValue.False) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.False) return loweredRight;
goto default;
case BinaryOperatorKind.BoolEqual:
if (loweredLeft.ConstantValue == ConstantValue.True) return loweredRight;
if (loweredRight.ConstantValue == ConstantValue.True) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.False)
return MakeUnaryOperator(UnaryOperatorKind.BoolLogicalNegation, syntax, null, loweredRight, loweredRight.Type);
if (loweredRight.ConstantValue == ConstantValue.False)
return MakeUnaryOperator(UnaryOperatorKind.BoolLogicalNegation, syntax, null, loweredLeft, loweredLeft.Type);
goto default;
case BinaryOperatorKind.BoolNotEqual:
if (loweredLeft.ConstantValue == ConstantValue.False) return loweredRight;
if (loweredRight.ConstantValue == ConstantValue.False) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.True)
return MakeUnaryOperator(UnaryOperatorKind.BoolLogicalNegation, syntax, null, loweredRight, loweredRight.Type);
if (loweredRight.ConstantValue == ConstantValue.True)
return MakeUnaryOperator(UnaryOperatorKind.BoolLogicalNegation, syntax, null, loweredLeft, loweredLeft.Type);
goto default;
case BinaryOperatorKind.BoolXor:
if (loweredLeft.ConstantValue == ConstantValue.False) return loweredRight;
if (loweredRight.ConstantValue == ConstantValue.False) return loweredLeft;
if (loweredLeft.ConstantValue == ConstantValue.True)
return MakeUnaryOperator(UnaryOperatorKind.BoolLogicalNegation, syntax, null, loweredRight, loweredRight.Type);
if (loweredRight.ConstantValue == ConstantValue.True)
return MakeUnaryOperator(UnaryOperatorKind.BoolLogicalNegation, syntax, null, loweredLeft, loweredLeft.Type);
goto default;
case BinaryOperatorKind.IntLeftShift:
case BinaryOperatorKind.UIntLeftShift:
case BinaryOperatorKind.IntRightShift:
case BinaryOperatorKind.UIntRightShift:
return RewriteBuiltInShiftOperation(oldNode, syntax, operatorKind, loweredLeft, loweredRight, type, 0x1F);
case BinaryOperatorKind.LongLeftShift:
case BinaryOperatorKind.ULongLeftShift:
case BinaryOperatorKind.LongRightShift:
case BinaryOperatorKind.ULongRightShift:
return RewriteBuiltInShiftOperation(oldNode, syntax, operatorKind, loweredLeft, loweredRight, type, 0x3F);
case BinaryOperatorKind.DecimalAddition:
case BinaryOperatorKind.DecimalSubtraction:
case BinaryOperatorKind.DecimalMultiplication:
case BinaryOperatorKind.DecimalDivision:
case BinaryOperatorKind.DecimalRemainder:
case BinaryOperatorKind.DecimalEqual:
case BinaryOperatorKind.DecimalNotEqual:
case BinaryOperatorKind.DecimalLessThan:
case BinaryOperatorKind.DecimalLessThanOrEqual:
case BinaryOperatorKind.DecimalGreaterThan:
case BinaryOperatorKind.DecimalGreaterThanOrEqual:
return RewriteDecimalBinaryOperation(syntax, loweredLeft, loweredRight, operatorKind);
case BinaryOperatorKind.PointerAndIntAddition:
case BinaryOperatorKind.PointerAndUIntAddition:
case BinaryOperatorKind.PointerAndLongAddition:
case BinaryOperatorKind.PointerAndULongAddition:
case BinaryOperatorKind.PointerAndIntSubtraction:
case BinaryOperatorKind.PointerAndUIntSubtraction:
case BinaryOperatorKind.PointerAndLongSubtraction:
case BinaryOperatorKind.PointerAndULongSubtraction:
return RewritePointerNumericOperator(syntax, operatorKind, loweredLeft, loweredRight, type, isPointerElementAccess, isLeftPointer: true);
case BinaryOperatorKind.IntAndPointerAddition:
case BinaryOperatorKind.UIntAndPointerAddition:
case BinaryOperatorKind.LongAndPointerAddition:
case BinaryOperatorKind.ULongAndPointerAddition:
return RewritePointerNumericOperator(syntax, operatorKind, loweredLeft, loweredRight, type, isPointerElementAccess, isLeftPointer: false);
case BinaryOperatorKind.PointerSubtraction:
return RewritePointerSubtraction(operatorKind, loweredLeft, loweredRight, type);
case BinaryOperatorKind.IntGreaterThan:
case BinaryOperatorKind.IntLessThanOrEqual:
if (loweredLeft.Kind == BoundKind.ArrayLength && loweredRight.IsDefaultValue())
{
//array length is never negative
var newOp = operatorKind == BinaryOperatorKind.IntGreaterThan ?
BinaryOperatorKind.NotEqual :
BinaryOperatorKind.Equal;
operatorKind &= ~BinaryOperatorKind.OpMask;
operatorKind |= newOp;
loweredLeft = UnconvertArrayLength((BoundArrayLength)loweredLeft);
}
goto default;
case BinaryOperatorKind.IntLessThan:
case BinaryOperatorKind.IntGreaterThanOrEqual:
if (loweredRight.Kind == BoundKind.ArrayLength && loweredLeft.IsDefaultValue())
{
//array length is never negative
var newOp = operatorKind == BinaryOperatorKind.IntLessThan ?
BinaryOperatorKind.NotEqual :
BinaryOperatorKind.Equal;
operatorKind &= ~BinaryOperatorKind.OpMask;
operatorKind |= newOp;
loweredRight = UnconvertArrayLength((BoundArrayLength)loweredRight);
}
goto default;
case BinaryOperatorKind.IntEqual:
case BinaryOperatorKind.IntNotEqual:
if (loweredLeft.Kind == BoundKind.ArrayLength && loweredRight.IsDefaultValue())
{
loweredLeft = UnconvertArrayLength((BoundArrayLength)loweredLeft);
}
else if (loweredRight.Kind == BoundKind.ArrayLength && loweredLeft.IsDefaultValue())
{
loweredRight = UnconvertArrayLength((BoundArrayLength)loweredRight);
}
goto default;
default:
break;
}
}
return (oldNode != null) ?
oldNode.Update(operatorKind, loweredLeft, loweredRight, oldNode.ConstantValueOpt, oldNode.MethodOpt, oldNode.ResultKind, type) :
new BoundBinaryOperator(syntax, operatorKind, loweredLeft, loweredRight, null, null, LookupResultKind.Viable, type);
}
private BoundExpression LowerUserDefinedBinaryOperator(
CSharpSyntaxNode syntax,
BinaryOperatorKind operatorKind,
BoundExpression loweredLeft,
BoundExpression loweredRight,
TypeSymbol type,
MethodSymbol method)
{
if (operatorKind.IsLogical())
{
// Yes, we could have a lifted, logical, user-defined operator:
//
// struct C {
// public static C operator &(C x, C y) {...}
// public static bool operator true(C? c) { ... }
// public static bool operator false(C? c) { ... }
// }
//
// If we have C? q, r and we say q && r then this gets bound as
// C? tempQ = q ;
// C.false(tempQ) ?
// tempQ :
// (
// C? tempR = r ;
// tempQ.HasValue & tempR.HasValue ?
// new C?(C.&(tempQ.GetValueOrDefault(), tempR.GetValueOrDefault())) :
// default C?()
// )
//
// Note that the native compiler does not allow q && r. However, the native compiler
// *does* allow q && r if C is defined as:
//
// struct C {
// public static C? operator &(C? x, C? y) {...}
// public static bool operator true(C? c) { ... }
// public static bool operator false(C? c) { ... }
// }
//
// It seems unusual and wrong that an & operator should be allowed to become
// a && operator if there is a "manually lifted" operator in source, but not
// if there is a "synthesized" lifted operator. Roslyn fixes this bug.
//
// Anyway, in this case we must lower this to its non-logical form, and then
// lower the interior of that to its non-lifted form.
return LowerUserDefinedLogicalOperator(syntax, operatorKind, loweredLeft, loweredRight, type, method);
}
else if (operatorKind.IsLifted())
{
if (operatorKind.IsComparison())
{
return LowerLiftedUserDefinedComparisonOperator(syntax, operatorKind, loweredLeft, loweredRight, method);
}
else
{
return LowerLiftedBinaryArithmeticOperator(syntax, operatorKind, loweredLeft, loweredRight, type, method);
}
}
// Otherwise, nothing special here.
Debug.Assert((object)method != null);
Debug.Assert(method.ReturnType == type);
return BoundCall.Synthesized(syntax, null, method, loweredLeft, loweredRight);
}
public static bool RequiresNumericTypes(this BinaryOperatorKind op)
{
return(op.IsArithmetic() || op.IsLogical() || op.IsComparison());
}
private BoundExpression LowerUserDefinedBinaryOperator(
CSharpSyntaxNode syntax,
BinaryOperatorKind operatorKind,
BoundExpression loweredLeft,
BoundExpression loweredRight,
TypeSymbol type,
MethodSymbol method)
{
Debug.Assert(!operatorKind.IsLogical());
if (operatorKind.IsLifted())
{
if (operatorKind.IsComparison())
{
return LowerLiftedUserDefinedComparisonOperator(syntax, operatorKind, loweredLeft, loweredRight, method);
}
else
{
return LowerLiftedBinaryArithmeticOperator(syntax, operatorKind, loweredLeft, loweredRight, type, method);
}
}
// Otherwise, nothing special here.
Debug.Assert((object)method != null);
Debug.Assert(method.ReturnType == type);
return BoundCall.Synthesized(syntax, null, method, loweredLeft, loweredRight);
}