protected virtual BoundExpression RewriteUnaryExpression(BoundUnaryExpression expression)
{
var operand = RewriteExpression(expression.Operand);
if (operand == expression.Operand)
{
return(expression);
}
return(new BoundUnaryExpression(expression.Op, operand));
}
protected override BoundExpression RewriteUnaryExpression(BoundUnaryExpression node)
{
var rewrittenOp = RewriteExpression(node.Operand);
var operand = IsSimpleNode(rewrittenOp) ? rewrittenOp : CreateTemporary(rewrittenOp);
var @operator = RewriteUnaryOperator(node.Operator);
if (node.Operand == operand && node.Operator == @operator)
{
return(node);
}
return(new BoundUnaryExpression(node.Syntax, @operator, operand));
}
private object EvaluateUnaryExpression(BoundUnaryExpression u)
{
var operand = EvaluateExpression(u.Operand);
if (u.Op.Type == null)
{
var conversion = Conversion.Classify(u.Operand.Type, u.Type);
if (!conversion.IsImplicit)
{
throw new Exception($"Can not implicitly cast type {u.Operand.Type} to {u.Type}");
}
}
return(Conversion.Convert(u.Type, u.Op.Operate(Conversion.Convert(u.Type, operand)))); // Convert twice incase C# changes the type after the operation
}
private object EvaluateUnaryExpression(BoundUnaryExpression u)
{
var operand = this.EvaluateExpression(u.Expression) !;
switch (u.Operator.Kind)
{
case BoundUnaryOperatorKind.Identity: return((int)operand);
case BoundUnaryOperatorKind.Negation: return(-(int)operand);
case BoundUnaryOperatorKind.LogicalNegation: return(!(bool)operand);
default:
throw new Exception($"Unexpected unary operator {u.Operator}");
}
}
private void EmitUnaryExpression(BoundUnaryExpression expression)
{
switch (expression.Kind)
{
case TokenKind.Minus:
{
this.EmitExpression(expression.Expression);
this.instructions.Add(new UnaryMinusInstruction(expression.Syntax.Range));
break;
}
default:
{
throw ExceptionUtilities.UnexpectedValue(expression.Kind);
}
}
}
private Expression BuildUnaryExpression(BoundUnaryExpression expression)
{
var liftedInput = BuildCachedExpression(expression.Expression);
var nullableResultType = expression.Type.GetNullableType();
var signature = expression.Result.Best.Signature;
return(Expression.Condition(
BuildNullCheck(liftedInput),
BuildNullValue(nullableResultType),
BuildLiftedExpression(
BuildUnaryExpression(
signature,
BuildLoweredExpression(liftedInput)
)
)
));
}
private void OutputUnaryExpression(BoundUnaryExpression node, string prefix)
{
builder.AddFragment(new OutputFragment(prefix, DefaultColour));
builder.AddFragment(new OutputFragment(node.Op.TokenText, DefaultColour));
bool isBinaryExpression = node.Operand is BoundBinaryExpression;
if (isBinaryExpression)
{
builder.AddFragment(new OutputFragment("(", DefaultColour));
}
Output(node.Operand, string.Empty);
if (isBinaryExpression)
{
builder.AddFragment(new OutputFragment(")", DefaultColour));
}
}
protected override object EvaluateExpression(BoundExpression node)
{
try
{
BoundLiteralExpression boundLiteralExpression = (BoundLiteralExpression)node;
return(EvaluateLiteralExpression(boundLiteralExpression));
}
catch
{
try
{
BoundVariableExpression boundVariableExpression = (BoundVariableExpression)node;
return(EvaluateVariableExpression(boundVariableExpression));
}
catch
{
try
{
BoundAssignmentExpression boundAssignmentExpression = (BoundAssignmentExpression)node;
return(EvaluateAssignmentExpression(boundAssignmentExpression));
}
catch
{
try
{
BoundUnaryExpression boundUnaryExpression = (BoundUnaryExpression)node;
return(EvaluateUnaryExpression(boundUnaryExpression));
}
catch
{
try
{
BoundBinaryExpression boundBinaryExpression = (BoundBinaryExpression)node;
return(EvaluateBinaryExpression(boundBinaryExpression));
}
catch
{
return(null);
}
}
}
}
}
}
private object Evaluate(BoundUnaryExpression unaryExpression)
{
var operand = EvaluateExpression(unaryExpression.Operand);
switch (unaryExpression.Op.Kind)
{
case BoundUnaryOperatorKind.Negation:
return(-(int)operand);
case BoundUnaryOperatorKind.Identity:
return((int)operand);
case BoundUnaryOperatorKind.LogicalNegation:
return(!(bool)operand);
case BoundUnaryOperatorKind.BitwiseNegation:
return(~(int)operand);
default:
throw new ArgumentOutOfRangeException(nameof(unaryExpression.Op), unaryExpression.Op, null);
}
}
private object EvaluateUnaryExpression(BoundUnaryExpression us)
{
var operand = EvaluateExpression(us.Operand);
switch (us.Op.Kind)
{
case BoundUnaryOperatorKind.Negation:
return(-(int)operand);
case BoundUnaryOperatorKind.Identity:
return((int)operand);
case BoundUnaryOperatorKind.LogicalNegation:
return(!(bool)operand);
case BoundUnaryOperatorKind.OnesComplement:
return(~(int)operand);
default:
throw new Exception($"Unexpected unary operator {us.Kind}");
}
}
private object EvaluateUnaryExpression(BoundUnaryExpression u)
{
var operand = EvaluateExpression(u.Operand);
switch (u.Op.Kind)
{
case BoundUnaryOperatorKind.Identity:
return((int)operand);
case BoundUnaryOperatorKind.Negation:
return(-(int)operand);
case BoundUnaryOperatorKind.LogicalNegation:
return(!(bool)operand);
case BoundUnaryOperatorKind.OnesComplement:
return(~(int)operand);
// For now we don't support DereferenceOf or ReferenceOf.
default:
throw new Exception($"Unexpected unary operator {u.Op}");
}
}
public override BoundConstant?VisitUnaryExpression(BoundUnaryExpression node)
{
var @operator = node.Operator;
var operandConstant = node.Operand.Accept(this);
if (operandConstant == null)
{
return(null);
}
var constant = operandConstant.Value;
return(@operator.Kind switch
{
BoundUnaryOperatorKind.Identity => operandConstant,
BoundUnaryOperatorKind.Negation => new BoundConstant(-(int)constant),
BoundUnaryOperatorKind.LogicalNegation => new BoundConstant(!(bool)constant),
BoundUnaryOperatorKind.BitwiseNegation => new BoundConstant(~(int)constant),
_
=> throw new ArgumentOutOfRangeException(
nameof(node),
$"Unknown operator kind '{@operator.Kind}'"
)
});
private void EmitUnaryExpression(ILProcessor ilProcessor, BoundUnaryExpression node)
{
throw new NotImplementedException();
}
private static void WriteBoundUnaryExpression(this IndentedTextWriter writer, BoundUnaryExpression node)
{
writer.ColorWrite("(");
writer.Write(node.Op.GetText());
writer.WriteBoundNode(node.Expression);
writer.ColorWrite(")");
}
protected virtual void VisitUnaryExpression(BoundUnaryExpression node)
{
VisitExpression(node.Expression);
}
public virtual void VisitUnaryExpression(BoundUnaryExpression node) => this.DefaultVisit(node);
private object EvaluateUnaryExpression(BoundUnaryExpression expression)
{
var operand = EvaluateExpression(expression.Operand);
switch (expression.Operator.Kind)
{
case BoundUnaryOperatorKind.Negation:
return(-(int)operand);
case BoundUnaryOperatorKind.Identity:
return((int)operand);
case BoundUnaryOperatorKind.LogicalNegation:
return(!(bool)operand);
case BoundUnaryOperatorKind.PrefixIncrement:
var prefixIncrementValue = (int)operand + 1;
if (expression.Operand.Kind == BoundNodeKind.VariableExpression)
{
var variableExpression = (BoundVariableExpression)expression.Operand;
_variables[variableExpression.Variable] = prefixIncrementValue;
}
return(prefixIncrementValue);
case BoundUnaryOperatorKind.PrefixDecrement:
var prefixDecrementValue = (int)operand - 1;
if (expression.Operand.Kind == BoundNodeKind.VariableExpression)
{
var variableExpression = (BoundVariableExpression)expression.Operand;
_variables[variableExpression.Variable] = prefixDecrementValue;
}
return(prefixDecrementValue);
case BoundUnaryOperatorKind.PostfixIncrement:
var postfixIncrementValue = (int)operand + 1;
if (expression.Operand.Kind == BoundNodeKind.VariableExpression)
{
var variableExpression = (BoundVariableExpression)expression.Operand;
_variables[variableExpression.Variable] = postfixIncrementValue;
return(operand);
}
return(postfixIncrementValue);
case BoundUnaryOperatorKind.PostfixDecrement:
var postfixDecrementValue = (int)operand - 1;
if (expression.Operand.Kind == BoundNodeKind.VariableExpression)
{
var variableExpression = (BoundVariableExpression)expression.Operand;
_variables[variableExpression.Variable] = postfixDecrementValue;
return(operand);
}
return(postfixDecrementValue);
case BoundUnaryOperatorKind.OnesCompliment:
return(~(int)operand);
default:
throw new Exception($"Unsupported unary operator {expression.Operator.Kind}.");
}
}