src/analysis/instantiated_type_analysis.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2009 Jean-Sebastien Gelinas <calestar@gmail.com>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #        http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Package containing all bases for instantiated type analysis
  18 package instantiated_type_analysis
  19
  20 import program
  21
  22 redef class Program
  23         # This attribute is the InstantiatedTypeAnalysis results
  24         readable writable var _ita: nullable InstantiatedTypeAnalysis = null
  25
  26         # We know which are really live, use that information !
  27         redef fun with_each_live_local_classes
  28                 !action(m: MMLocalClass)
  29         do
  30                 for c in module.local_classes do
  31                         if ita == null or ita.as(not null).is_class_instantiated(c) then action(c)
  32                 end
  33         end
  34 end
  35
  36 # Subclasses of this class would represent an analysis that produces
  37 # at least a way of knowing if a class is instantiated somewhere in a
  38 # method that is reachable from the entry point of the program
  39 class InstantiatedTypeAnalysis
  40         fun is_class_instantiated(local_class: MMLocalClass): Bool is abstract
  41 end
  42
  43 # Default behavior is to say that all types are instantiated
  44 class DefaultInstantiatedTypeAnalysis
  45 special InstantiatedTypeAnalysis
  46         redef fun is_class_instantiated(local_class: MMLocalClass): Bool do return true
  47
  48         init do end
  49 end