2 // ConstToIntervalEvaluator.cs
5 // Alexander Chebaturkin (chebaturkin@gmail.com)
7 // Copyright (C) 2012 Alexander Chebaturkin
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 namespace Mono.CodeContracts.Static.Analysis.Numerical {
32 class ConstToIntervalEvaluator<TContext, TVar, TExpr, TInterval, TNumeric> :
33 GenericTypeExpressionVisitor<TVar, TExpr, TContext, TInterval>
34 where TContext : IntervalContextBase<TInterval, TNumeric>
35 where TVar : IEquatable<TVar>
36 where TInterval : IntervalBase<TInterval, TNumeric> {
37 public ConstToIntervalEvaluator (IExpressionDecoder<TVar, TExpr> decoder)
42 public override TInterval Visit (TExpr e, TContext ctx)
44 if (!ReferenceEquals (e, null) && Decoder.IsConstant (e))
45 return base.Visit (e, ctx);
47 return Default (e, ctx);
50 protected override TInterval VisitBool (TExpr expr, TContext ctx)
53 if (Decoder.TryValueOf (expr, ExpressionType.Bool, out value))
54 return ctx.For (value ? 1L : 0L);
56 return Default (expr, ctx);
59 protected override TInterval VisitInt32 (TExpr expr, TContext ctx)
62 if (Decoder.TryValueOf (expr, ExpressionType.Int32, out value))
63 return ctx.For (value);
65 return Default (expr, ctx);
68 protected override TInterval Default (TExpr expr, TContext ctx)