69 lines
3.4 KiB
C#
69 lines
3.4 KiB
C#
//
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// DisIntervalAssumer.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 System;
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namespace Mono.CodeContracts.Static.Analysis.Numerical {
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class DisIntervalAssumer<Var, Expr> : IntervalRationalAssumerBase<Var, Expr, DisInterval>
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where Var : IEquatable<Var> {
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public override IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> AssumeNotEqualToZero
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(Var var, IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> env)
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{
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return AssumeEqualToDisInterval (var, DisInterval.NotZero, env);
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}
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static IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> AssumeEqualToDisInterval
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(Var var, DisInterval intv, IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> env)
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{
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return env.RefineVariable (var, intv);
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}
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public override IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> AssumeNotEqual
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(Expr left, Expr right, IntervalEnvironmentBase<Var, Expr, DisInterval, Rational> env)
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{
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var result = env;
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var rightIntv = env.Eval (right);
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if (rightIntv.IsSinglePoint) {
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var everythingExcept = DisInterval.EverythingExcept (rightIntv);
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result = result.RefineVariable (env.Decoder.UnderlyingVariable (left), everythingExcept);
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}
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IntervalInference.InferenceResult<Var, DisInterval> resultLeft;
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IntervalInference.InferenceResult<Var, DisInterval> resultRight;
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IntervalInference.ConstraintsFor.NotEqual (left, right, env.Decoder, result, out resultLeft,
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out resultRight);
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var join = resultLeft.Join (resultRight);
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if (join.IsBottom)
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return env.Bottom as IntervalEnvironmentBase<Var, Expr, DisInterval, Rational>;
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return AssumeConstraints (join.Constraints, env);
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}
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}
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} |