1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
//
// StepWidening.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections.Generic;
using Mono.CodeContracts.Static.ControlFlow;
namespace Mono.CodeContracts.Static.DataFlowAnalysis {
abstract class StepWidening<Index> : IWidenStrategy {
private readonly int N;
private readonly Dictionary<Index, int> widenCounter;
protected StepWidening (int n)
{
this.widenCounter = new Dictionary<Index, int> ();
this.N = n;
}
protected abstract Index MakeIndex (APC from, APC to);
#region Implementation of IWidenStrategy
public bool WantToWiden (APC from, APC to, bool isBackEdge)
{
if (!isBackEdge)
return false;
Index key = MakeIndex (from, to);
if (this.widenCounter.ContainsKey (key))
this.widenCounter [key] = this.widenCounter [key] + 1;
else
this.widenCounter [key] = 1;
return this.N < this.widenCounter [key];
}
#endregion
}
}
|
