[Ada] Fix detection of actual parameters for procedure calls

gcc/ada/

	* sem_ch8.adb (Is_Actual_Parameter): Fix processing when parent
	is a procedure call statement; extend comment.

1 files changed, 24 insertions, 10 deletions

diff --git a/gcc/ada/sem_ch8.adb b/gcc/ada/sem_ch8.adb
index bc52eb0..08414b2 100644
--- a/gcc/ada/sem_ch8.adb
+++ b/gcc/ada/sem_ch8.adb
@@ -5020,7 +5020,12 @@ package body Sem_Ch8 is
       --  not know what procedure is being called if the procedure might be
       --  overloaded, so it is premature to go setting referenced flags or
       --  making calls to Generate_Reference. We will wait till Resolve_Actuals
-      --  for that processing
+      --  for that processing.
+      --  Note: there is a similar routine Sem_Util.Is_Actual_Parameter, but
+      --  it works for both function and procedure calls, while here we are
+      --  only concerned with procedure calls (and with entry calls as well,
+      --  but they are parsed as procedure calls and only later rewritten to
+      --  entry calls).
 
       function Known_But_Invisible (E : Entity_Id) return Boolean;
       --  This function determines whether a reference to the entity E, which
@@ -5141,15 +5146,24 @@ package body Sem_Ch8 is
 
       function Is_Actual_Parameter return Boolean is
       begin
-         return
-           Nkind (N) = N_Identifier
-             and then
-               (Nkind (Parent (N)) = N_Procedure_Call_Statement
-                 or else
-                   (Nkind (Parent (N)) = N_Parameter_Association
-                     and then N = Explicit_Actual_Parameter (Parent (N))
-                     and then Nkind (Parent (Parent (N))) =
-                                          N_Procedure_Call_Statement));
+         if Nkind (N) = N_Identifier then
+            case Nkind (Parent (N)) is
+               when N_Procedure_Call_Statement =>
+                  return Is_List_Member (N)
+                    and then List_Containing (N) =
+                      Parameter_Associations (Parent (N));
+
+               when N_Parameter_Association =>
+                  return N = Explicit_Actual_Parameter (Parent (N))
+                    and then Nkind (Parent (Parent (N))) =
+                               N_Procedure_Call_Statement;
+
+               when others =>
+                  return False;
+            end case;
+         else
+            return False;
+         end if;
       end Is_Actual_Parameter;
 
       -------------------------