mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.Analysis.HeapAnalysis/TypeCache.cs

   1 //
   2 // TypeCache.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 using Mono.CodeContracts.Static.AST;
  29 using Mono.CodeContracts.Static.Providers;
  30
  31 namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis {
  32         struct TypeCache {
  33                 private readonly string full_name;
  34                 private TypeNode cache;
  35                 private bool cache_is_valid;
  36                 private bool have_type;
  37
  38                 public TypeCache (string fullName)
  39                 {
  40                         this.cache_is_valid = false;
  41                         this.have_type = false;
  42                         this.cache = default(TypeNode);
  43                         this.full_name = fullName;
  44                 }
  45
  46                 public bool TryGet (IMetaDataProvider mdProvider, out TypeNode type)
  47                 {
  48                         if (!this.cache_is_valid) {
  49                                 this.cache_is_valid = true;
  50                                 this.have_type = mdProvider.TryGetSystemType (this.full_name, out this.cache);
  51                         }
  52
  53                         type = this.cache;
  54                         return this.have_type;
  55                 }
  56         }
  57 }