73 lines
3.0 KiB
C#
73 lines
3.0 KiB
C#
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//
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// ConstToIntervalEvaluator.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 ConstToIntervalEvaluator<TContext, TVar, TExpr, TInterval, TNumeric> :
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GenericTypeExpressionVisitor<TVar, TExpr, TContext, TInterval>
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where TContext : IntervalContextBase<TInterval, TNumeric>
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where TVar : IEquatable<TVar>
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where TInterval : IntervalBase<TInterval, TNumeric> {
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public ConstToIntervalEvaluator (IExpressionDecoder<TVar, TExpr> decoder)
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: base (decoder)
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{
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}
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public override TInterval Visit (TExpr e, TContext ctx)
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{
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if (!ReferenceEquals (e, null) && Decoder.IsConstant (e))
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return base.Visit (e, ctx);
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return Default (e, ctx);
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}
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protected override TInterval VisitBool (TExpr expr, TContext ctx)
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{
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bool value;
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if (Decoder.TryValueOf (expr, ExpressionType.Bool, out value))
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return ctx.For (value ? 1L : 0L);
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return Default (expr, ctx);
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}
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protected override TInterval VisitInt32 (TExpr expr, TContext ctx)
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{
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int value;
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if (Decoder.TryValueOf (expr, ExpressionType.Int32, out value))
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return ctx.For (value);
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return Default (expr, ctx);
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}
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protected override TInterval Default (TExpr expr, TContext ctx)
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{
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return ctx.TopValue;
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}
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}
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}
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