analysis: add an analysis to know if a method/iroutine is reachable from an init

[nit.git] / src / analysis / reachable_from_init_method_analysis.nit

diff --git a/src/analysis/reachable_from_init_method_analysis.nit b/src/analysis/reachable_from_init_method_analysis.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2009 Jean-Sebastien Gelinas <calestar@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Package containing all bases for the reachable from init method analysis
+package reachable_from_init_method_analysis
+
+import icode
+import program
+import reachable_method_analysis
+
+redef class Program
+       # This attribute is the ReachableFromInitMethodAnalysis results
+       readable writable var _rfima: nullable ReachableFromInitMethodAnalysis = null
+end
+
+# Subclasses of this class would represent an analysis that produces
+# at least a way of knowing if a property is reachable from at least
+# one init in the program
+class ReachableFromInitMethodAnalysis
+       fun is_iroutine_reachable_from_init(ir: nullable IRoutine): Bool is abstract
+       fun is_method_reachable_from_init(method: MMMethod): Bool is abstract
+end
+
+# Default behavior is to say that all methods/iroutines are reachable
+# from at least one init
+class DefaultReachableFromInitMethodAnalysis
+special ReachableFromInitMethodAnalysis
+       redef fun is_iroutine_reachable_from_init(ir: nullable IRoutine): Bool do return true
+       redef fun is_method_reachable_from_init(method: MMMethod): Bool do return true
+
+       init do end
+end