ada: Fix for validity checking and conditional evaluation of 'Old

Detection of expression that are "known on entry" (as defined in Ada
2022 RM 6.1.1(20/5)) was confused by validity checks when used from
within expansion of attribute 'Old.

gcc/ada/

	* sem_util.adb (Is_Known_On_Entry): Handle constants introduced
	by validity checks.

diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index be777d26e46563e1c591a99b2918d2cd95745326..d512d462b443981bc14b9df64376d9dc8ef6c2ea 100644 (file)
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -30791,6 +30791,14 @@ package body Sem_Util is
                               return False;
                            end if;
 
+                           --  Handle constants introduced by side-effect
+                           --  removal, e.g. by validity checks.
+
+                           if not Comes_From_Source (Obj) then
+                              return
+                                Is_Known_On_Entry (Expression (Parent (Obj)));
+                           end if;
+
                            --  return False if not "all views are constant".
                            if Is_Immutably_Limited_Type (Obj_Typ)
                              or Needs_Finalization (Obj_Typ)