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//
// EvaluateArithmeticWithOverflow.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2012 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using Mono.CodeContracts.Static.DataStructures;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
static class EvaluateArithmeticWithOverflow {
public static bool TryBinary (ExpressionOperator op, long left, long right, out int res)
{
return LongToIntegerConstantEvaluator.Evaluate (op, left, right, out res);
}
public static bool TryBinary (ExpressionOperator op, long left, long right, out uint res)
{
return false.Without (out res);
}
public static bool TryBinary<In> (ExpressionType targetType, ExpressionOperator op, In left, In right,
out object res)
where In : struct
{
switch (targetType) {
case ExpressionType.Unknown:
case ExpressionType.Bool:
return false.Without (out res);
case ExpressionType.Int32:
var l = left.ConvertToLong ();
var r = right.ConvertToLong ();
int intValue;
if (l.HasValue && r.HasValue && TryBinary (op, l.Value, r.Value, out intValue))
return true.With (intValue, out res);
break;
}
return false.Without (out res);
}
}
}
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