5 // Alexander Chebaturkin (chebaturkin@gmail.com)
7 // Copyright (C) 2011 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.
29 using System.Collections.Generic;
30 using Mono.CodeContracts.Static.ControlFlow;
32 namespace Mono.CodeContracts.Static.DataFlowAnalysis {
33 abstract class StepWidening<Index> : IWidenStrategy {
34 private readonly int N;
35 private readonly Dictionary<Index, int> widenCounter;
37 protected StepWidening (int n)
39 this.widenCounter = new Dictionary<Index, int> ();
43 protected abstract Index MakeIndex (APC from, APC to);
45 #region Implementation of IWidenStrategy
46 public bool WantToWiden (APC from, APC to, bool isBackEdge)
51 Index key = MakeIndex (from, to);
52 if (this.widenCounter.ContainsKey (key))
53 this.widenCounter [key] = this.widenCounter [key] + 1;
55 this.widenCounter [key] = 1;
56 return this.N < this.widenCounter [key];