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[Ada] Extension of 'Image in Ada2020

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Justin Squirek <squirek at adacore dot com>
Date: Wed, 6 Sep 2017 07:02:59 -0400
Subject: [Ada] Extension of 'Image in Ada2020
Authentication-results: sourceware.org; auth=none

Refactor of all 'Image attributes for better error diagnostics and clarity.

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

2017-09-06  Justin Squirek  <squirek@adacore.com>

	* exp_imgv.adb (Expand_Image_Attribute),
	(Expand_Wide_Image_Attribute), (Expand_Wide_Wide_Image_Attribute):
	Added case to handle new-style 'Image expansion
	(Rewrite_Object_Image): Moved from exp_attr.adb
	* exp_attr.adb (Expand_N_Attribute_Reference): Modified Image
	attribute cases so that the relevant subprograms in exp_imgv.adb
	handle all expansion.
	(Rewrite_Object_Reference_Image): Moved to exp_imgv.adb
	* sem_attr.adb (Analyze_Attribute): Modified Image attribute
	cases to call common function Analyze_Image_Attribute.
	(Analyze_Image_Attribute): Created as a common path for all
	image attributes (Check_Object_Reference_Image): Removed
	* sem_util.ads, sem_util.adb (Is_Image_Applied_To_Object):
	Removed and refactored into Is_Object_Image (Is_Object_Image):
	Created as a replacement for Is_Image_Applied_To_Object

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