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 using Mono.CodeContracts.Static.Lattices;
33 namespace Mono.CodeContracts.Static.Analysis.Numerical {
35 /// Represents a generic class for intervals on numeric values.
37 public abstract class IntervalBase<TInterval, TNumeric> : IAbstractDomain<TInterval>
38 where TInterval : IntervalBase<TInterval, TNumeric> {
39 protected IntervalBase (TNumeric lowerBound, TNumeric upperBound)
41 LowerBound = lowerBound;
42 UpperBound = upperBound;
45 public TNumeric UpperBound { get; protected set; }
46 public TNumeric LowerBound { get; protected set; }
48 public abstract TInterval Top { get; }
49 public abstract TInterval Bottom { get; }
51 public abstract bool IsTop { get; }
52 public abstract bool IsBottom { get; }
54 public bool IsSinglePoint { get { return this.IsNormal () && LowerBound.Equals (UpperBound); } }
55 public bool IsFinite { get { return this.IsNormal () && IsFiniteBound (LowerBound) && IsFiniteBound (UpperBound); } }
57 public abstract bool LessEqual (TInterval that);
59 public abstract TInterval Join (TInterval that, bool widening, out bool weaker);
60 public abstract TInterval Join (TInterval that);
62 public abstract TInterval Widen (TInterval that);
63 public abstract TInterval Meet (TInterval that);
65 public abstract TInterval ImmutableVersion ();
66 public abstract TInterval Clone ();
68 public abstract void Dump (TextWriter tw);
70 public override string ToString ()
72 return string.Format ("[{0}, {1}]{2}", LowerBound, UpperBound, this.BottomSymbolIfAny ());
75 protected abstract bool IsFiniteBound (TNumeric n);