[Ada] Illegal renaming of conditional expression

[Ada] Illegal renaming of conditional expression

[Arnaud Charlet]

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This patch corrects a compiler bug that caused an illegal renaming to
not be detected. In particular, it wasn't detected if the name in the
renaming is a qualified expression whose operand is a conditional
expression, and the type is a by-reference type.

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

2017-04-25  Bob Duff  <duff@adacore.com>

	* sem_util.adb (Is_Object_Reference): In the
	case of N_Explicit_Dereference, return False if it came from a
	conditional expression.


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Index: sem_util.adb
===================================================================
--- sem_util.adb	(revision 247137)
+++ sem_util.adb	(working copy)
@@ -13548,8 +13548,14 @@
                      (Is_Object_Reference (Prefix (N))
                        or else Is_Access_Type (Etype (Prefix (N))));
 
+            --  An explicit dereference denotes an object, except that a
+            --  conditional expression gets turned into an explicit dereference
+            --  in some cases, and conditional expressions are not object
+            --  names.
+
             when N_Explicit_Dereference =>
-               return True;
+               return not Nkind_In
+                 (Original_Node (N), N_If_Expression, N_Case_Expression);
 
             --  A view conversion of a tagged object is an object reference