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[Ada] Generate Alfa cross-references for instantiations of generics

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Yannick Moy <moy at adacore dot com>
Date: Fri, 30 Mar 2012 05:24:19 -0400
Subject: [Ada] Generate Alfa cross-references for instantiations of generics

In order to apply formal verification to code with instantiations of generics,
we must get Alfa cross-references for this code. This consists mostly in
enabling the generation of instances in Alfa mode, and adapting the Alfa xref
code.

Tested on x86_64-pc-linux-gnu, committed on trunk

2012-03-30  Yannick Moy  <moy@adacore.com>

	* lib-xref-alfa.adb (Generate_Dereference): Use Get_Code_Unit
	instead of Get_Source_Unit to get file for reference.
	(Traverse_Compilation_Unit): Do not add scopes for generic units.
	* lib-xref.adb (Generate_Reference): Use Get_Code_Unit instead
	of Get_Source_Unit to get file for reference.
	* sem_ch12.adb (Analyze_Package_Instantiation): Enable
	instantiation in Alfa mode.

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