public override bool Unary(APC pc, UnaryOperator op, bool overflow, bool unsigned, Variable dest, Variable source, bool data)
{
if (this.IgnoreProofObligationAtPC(pc))
{
return(data);
}
var mdDecoder = this.MetaDataDecoder;
if (this.myOptions.NegMinObligations && op == UnaryOperator.Neg)
{
var type = this.Context.ValueContext.GetType(pc, source);
if (type.IsNormal &&
(mdDecoder.Equal(type.Value, mdDecoder.System_Int32) ||
mdDecoder.Equal(type.Value, mdDecoder.System_Int64) ||
mdDecoder.Equal(type.Value, mdDecoder.System_Int16) ||
mdDecoder.Equal(type.Value, mdDecoder.System_Int8)
))
{
var argAsBoxedExpression = BoxedExpression.Convert(this.Context.ExpressionContext.Refine(pc, source), this.DecoderForExpressions.Outdecoder);
if (argAsBoxedExpression != null)
{
this.Add(new NoMinValueObligation(type.Value, mdDecoder.Name(type.Value), argAsBoxedExpression, this.DecoderForExpressions, pc, this.MethodDriver));
}
}
}
if (overflow && this.myOptions.ArithmeticOverflow && op.IsConversionOperator())
{
// this.Context.ValueContext.GetType fails sometimes. This is why we infer the type from the operator
Type type;
if (mdDecoder.TryInferTypeForOperator(op, out type))
{
var exp = BoxedExpression.Convert(this.Context.ExpressionContext.Refine(pc, source), this.DecoderForExpressions.Outdecoder);
if (exp != null)
{
this.Add(new ArithmeticUnderflow(exp, type, pc, this.DecoderForExpressions, this.MethodDriver));
this.Add(new ArithmeticOverflow(exp, type, pc, this.DecoderForExpressions, this.MethodDriver));
}
}
}
return(data);
}