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