[Ada] Do not mark user parameters of protected subprograms as artificial

[Ada] Do not mark user parameters of protected subprograms as artificial

[Marc Poulhiès]

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This occurs because protected subprograms are not translated directly into
object code but first rewritten as a pair of subprograms by the front-end.

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

gcc/ada/

	* exp_ch9.adb (Build_Protected_Spec): Tidy up and propagate the
	Comes_From_Source flag onto the new formal parameters.
	* sem_ch6.adb (Analyze_Subprogram_Body_Helper): Do not check
	references for subprograms generated for protected subprograms.

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diff --git a/gcc/ada/exp_ch9.adb b/gcc/ada/exp_ch9.adb
--- a/gcc/ada/exp_ch9.adb
+++ b/gcc/ada/exp_ch9.adb
@@ -3868,32 +3868,35 @@ package body Exp_Ch9 is
       Ident       : Entity_Id;
       Unprotected : Boolean := False) return List_Id
    is
-      Loc       : constant Source_Ptr := Sloc (N);
-      Decl      : Node_Id;
-      Formal    : Entity_Id;
-      New_Plist : List_Id;
-      New_Param : Node_Id;
+      Loc : constant Source_Ptr := Sloc (N);
+
+      Decl       : Node_Id;
+      Formal     : Entity_Id;
+      New_Formal : Entity_Id;
+      New_Plist  : List_Id;
 
    begin
       New_Plist := New_List;
 
       Formal := First_Formal (Ident);
       while Present (Formal) loop
-         New_Param :=
+         New_Formal :=
+           Make_Defining_Identifier (Sloc (Formal), Chars (Formal));
+         Set_Comes_From_Source (New_Formal, Comes_From_Source (Formal));
+
+         if Unprotected then
+            Mutate_Ekind (New_Formal, Ekind (Formal));
+            Set_Protected_Formal (Formal, New_Formal);
+         end if;
+
+         Append_To (New_Plist,
            Make_Parameter_Specification (Loc,
-             Defining_Identifier =>
-               Make_Defining_Identifier (Sloc (Formal), Chars (Formal)),
+             Defining_Identifier => New_Formal,
              Aliased_Present     => Aliased_Present (Parent (Formal)),
              In_Present          => In_Present      (Parent (Formal)),
              Out_Present         => Out_Present     (Parent (Formal)),
-             Parameter_Type      => New_Occurrence_Of (Etype (Formal), Loc));
-
-         if Unprotected then
-            Set_Protected_Formal (Formal, Defining_Identifier (New_Param));
-            Mutate_Ekind (Defining_Identifier (New_Param), Ekind (Formal));
-         end if;
+             Parameter_Type      => New_Occurrence_Of (Etype (Formal), Loc)));
 
-         Append (New_Param, New_Plist);
          Next_Formal (Formal);
       end loop;
 


diff --git a/gcc/ada/sem_ch6.adb b/gcc/ada/sem_ch6.adb
--- a/gcc/ada/sem_ch6.adb
+++ b/gcc/ada/sem_ch6.adb
@@ -5511,12 +5511,22 @@ package body Sem_Ch6 is
 
          --  Check references of the subprogram spec when we are dealing with
          --  an expression function due to it having a generated body.
-         --  Otherwise, we simply check the formals of the subprogram body.
 
          if Present (Spec_Id)
            and then Is_Expression_Function (Spec_Id)
          then
             Check_References (Spec_Id);
+
+         --  Skip the check for subprograms generated for protected subprograms
+         --  because it is also done for the protected subprograms themselves.
+
+         elsif Present (Spec_Id)
+           and then Present (Protected_Subprogram (Spec_Id))
+         then
+            null;
+
+         --  Otherwise, we simply check the formals of the subprogram body.
+
          else
             Check_References (Body_Id);
          end if;