1 // 2 // AccessPathFilter.cs 3 // 4 // Authors: 5 // Alexander Chebaturkin (chebaturkin@gmail.com) 6 // 7 // Copyright (C) 2011 Alexander Chebaturkin 8 // 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: 16 // 17 // The above copyright notice and this permission notice shall be 18 // included in all copies or substantial portions of the Software. 19 // 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. 27 // 28 29 using System; 30 31 namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis.Paths { 32 class AccessPathFilter<TMember> { 33 public static AccessPathFilter<TMember> NoFilter = new AccessPathFilter<TMember> (); 34 private readonly Flags flags; 35 private readonly TMember member; 36 private readonly MemberFilter member_filter; 37 AccessPathFilter()38 private AccessPathFilter () 39 { 40 this.flags = Flags.AllowLocals; 41 this.member_filter = MemberFilter.NoFilter; 42 } 43 AccessPathFilter(TMember member, MemberFilter memberFilter)44 private AccessPathFilter (TMember member, MemberFilter memberFilter) 45 { 46 this.member_filter = memberFilter; 47 this.member = member; 48 } 49 50 public bool AllowLocal 51 { 52 get { return (this.flags & Flags.AllowLocals) == Flags.AllowLocals; } 53 } 54 55 public bool HasVisibilityMember 56 { 57 get { return this.member_filter != MemberFilter.NoFilter; } 58 } 59 60 public TMember VisibilityMember 61 { 62 get { return this.member; } 63 } 64 FromPrecondition(TMember member)65 public static AccessPathFilter<TMember> FromPrecondition (TMember member) 66 { 67 return new AccessPathFilter<TMember> (member, MemberFilter.FromPrecondition); 68 } 69 FromPostcondition(TMember member)70 public static AccessPathFilter<TMember> FromPostcondition (TMember member) 71 { 72 return new AccessPathFilter<TMember> (member, MemberFilter.FromPostcondition); 73 } 74 IsVisibleFrom(TMember member)75 public static AccessPathFilter<TMember> IsVisibleFrom (TMember member) 76 { 77 return new AccessPathFilter<TMember> (member, MemberFilter.FromMethodBody); 78 } 79 80 public bool FilterOutPathElement<P> (P element) 81 where P : IVisibilityCheck<TMember> 82 { 83 switch (this.member_filter) { 84 case MemberFilter.FromPrecondition: 85 return !element.IsAsVisibleAs (this.member); 86 case MemberFilter.FromPostcondition: 87 return !element.IfRootIsParameter || !element.IsVisibleFrom (this.member); 88 case MemberFilter.FromMethodBody: 89 return !element.IsVisibleFrom (this.member); 90 default: 91 return false; 92 } 93 } 94 95 #region Nested type: Flags 96 [Flags] 97 private enum Flags { 98 AllowLocals = 1, 99 RequireParameter = 2 100 } 101 #endregion 102 103 #region Nested type: MemberFilter 104 private enum MemberFilter { 105 NoFilter = 0, 106 FromPrecondition, 107 FromPostcondition, 108 FromMethodBody 109 } 110 #endregion 111 } 112 } 113