[COMMITTED] ada: Avoid repeated iteration over private protected components

[COMMITTED] ada: Avoid repeated iteration over private protected components

[Marc Poulhiès]

From: Piotr Trojanek <trojanek@adacore.com>

The First_Entity/Next_Entity chain includes private entities, so there
it no need to iterate starting both from First_Entity and
First_Private_Entity.

Code cleanup related to improved detection of references to
uninitialized objects; behavior is unaffected.

gcc/ada/

	* sem_util.adb
	(Check_Components): Iterate using
	First/Next_Component_Or_Discriminant.
	(Has_Preelaborable_Initialization): Avoid repeated iteration with
	calls to Check_Components with First_Entity and
	First_Private_Entity.
	(Is_Independent_Object_Entity): Tune indentation.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_util.adb | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index 9a7640b3147..536d5fadefb 100644
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -13679,15 +13679,12 @@ package body Sem_Util is
          Exp : Node_Id;
 
       begin
-         --  Loop through entities of record or protected type
+         --  Loop through components and discriminants of record or protected
+         --  type.
 
-         Ent := E;
+         Ent := First_Component_Or_Discriminant (E);
          while Present (Ent) loop
 
-            --  We are interested only in components and discriminants
-
-            Exp := Empty;
-
             case Ekind (Ent) is
                when E_Component =>
 
@@ -13698,6 +13695,8 @@ package body Sem_Util is
 
                   if Present (Declaration_Node (Ent)) then
                      Exp := Expression (Declaration_Node (Ent));
+                  else
+                     Exp := Empty;
                   end if;
 
                when E_Discriminant =>
@@ -13710,7 +13709,7 @@ package body Sem_Util is
                   Exp := Discriminant_Default_Value (Ent);
 
                when others =>
-                  goto Check_Next_Entity;
+                  raise Program_Error;
             end case;
 
             --  A component has PI if it has no default expression and the
@@ -13731,8 +13730,7 @@ package body Sem_Util is
                exit;
             end if;
 
-         <<Check_Next_Entity>>
-            Next_Entity (Ent);
+            Next_Component_Or_Discriminant (Ent);
          end loop;
       end Check_Components;
 
@@ -13842,7 +13840,7 @@ package body Sem_Util is
          --  If OK, check extension components (if any)
 
          if Has_PE and then Is_Record_Type (E) then
-            Check_Components (First_Entity (E));
+            Check_Components (E);
          end if;
 
          --  Check specifically for 10.2.1(11.4/2) exception: a controlled type
@@ -13882,7 +13880,7 @@ package body Sem_Util is
 
       elsif Is_Record_Type (E) then
          Has_PE := True;
-         Check_Components (First_Entity (E));
+         Check_Components (E);
 
       --  Protected types must not have entries, and components must meet
       --  same set of rules as for record components.
@@ -13892,8 +13890,7 @@ package body Sem_Util is
             Has_PE := False;
          else
             Has_PE := True;
-            Check_Components (First_Entity (E));
-            Check_Components (First_Private_Entity (E));
+            Check_Components (E);
          end if;
 
       --  Type System.Address always has preelaborable initialization
@@ -18305,7 +18302,7 @@ package body Sem_Util is
            Is_Object (Id)
              and then (Is_Independent (Id)
                         or else
-                      Is_Independent (Etype (Id)));
+                       Is_Independent (Etype (Id)));
       end Is_Independent_Object_Entity;
 
       -------------------------------------
-- 
2.34.1