Fix accessibilty check failures on Mac OS

Use proper named access types to avoid some
accessibility checks emitted by the Mac OS compiler
from Alire.

Closes eng/ide/ada_language_server#1573

Author: AnthonyLeonardoGracio

source/ada/lsp-ada_driver.adb

@@ -261,9 +261,9 @@ procedure LSP.Ada_Driver is
    Server      : aliased LSP.Servers.Server;
    Stream      : aliased LSP.Stdio_Streams.Stdio_Stream;
    Ada_Handler : aliased LSP.Ada_Handlers.Message_Handler
-     (Server'Access, Server'Access, Tracer'Unchecked_Access);
+     (Server'Unchecked_Access, Server'Access, Tracer'Unchecked_Access);
    GPR_Handler : aliased LSP.GPR_Handlers.Message_Handler
-     (Server'Access, Tracer'Unchecked_Access);
+     (Server'Unchecked_Access, Tracer'Unchecked_Access);
 
    --  Job handlers
    Ada_Did_Change_Handler : aliased

source/ada/lsp-ada_handlers.adb

@@ -88,7 +88,6 @@ with LSP.Formatters.Texts;
 with LSP.Generic_Cancel_Check;
 with LSP.GNATCOLL_Tracers.Handle;
 with LSP.Search;
-with LSP.Servers;
 with LSP.Servers.FS_Watch;
 with LSP.Structures.LSPAny_Vectors;
 with LSP.Utils;
@@ -397,7 +396,7 @@ package body LSP.Ada_Handlers is
    ----------------
 
    procedure Initialize
-     (Self                     : access Message_Handler'Class;
+     (Self                     : in out Message_Handler;
       Incremental_Text_Changes : Boolean;
       CLI_Config_File          : GNATCOLL.VFS.Virtual_File :=
         GNATCOLL.VFS.No_File)
@@ -407,7 +406,8 @@ package body LSP.Ada_Handlers is
       Self.File_Monitor :=
         new LSP.Servers.FS_Watch.FS_Watch_Monitor (Self.Server);
       Self.Diagnostic_Sources :=
-         [new LSP.Ada_Handlers.Project_Diagnostics.Diagnostic_Source (Self)];
+         [new LSP.Ada_Handlers.Project_Diagnostics.Diagnostic_Source
+           (Self'Unchecked_Access)];
 
       Self.Load_Config_Files (CLI_Config_File);
    end Initialize;

source/ada/lsp-ada_handlers.ads

@@ -51,7 +51,7 @@ with LSP.Server_Notification_Receivers;
 with LSP.Server_Notifications;
 with LSP.Server_Request_Receivers;
 with LSP.Server_Requests;
-limited with LSP.Servers;
+with LSP.Servers;
 with LSP.Structures;
 with LSP.Tracers;
 with LSP.Unimplemented_Handlers;
@@ -62,7 +62,7 @@ private with LAL_Refactor;
 package LSP.Ada_Handlers is
 
    type Message_Handler
-     (Server : not null access LSP.Servers.Server'Class;
+     (Server : not null LSP.Servers.Server_Access;
       --  Please avoid to use this discriminant!
       Sender : not null access LSP.Client_Message_Receivers
         .Client_Message_Receiver'Class;
@@ -74,7 +74,7 @@ package LSP.Ada_Handlers is
    with private;
 
    procedure Initialize
-     (Self                     : access Message_Handler'Class;
+     (Self                     : in out Message_Handler;
       Incremental_Text_Changes : Boolean;
       CLI_Config_File          : GNATCOLL.VFS.Virtual_File :=
         GNATCOLL.VFS.No_File);
@@ -168,7 +168,7 @@ private
    type Has_Been_Canceled_Function is access function return Boolean;
 
    type Message_Handler
-     (Server : not null access LSP.Servers.Server'Class;
+     (Server : not null LSP.Servers.Server_Access;
       --  Please avoid to use this discriminant!
       Sender : not null access LSP.Client_Message_Receivers
         .Client_Message_Receiver'Class;

source/server/lsp-servers-fs_watch.ads

@@ -24,7 +24,7 @@ private with Libfswatch;
 
 package LSP.Servers.FS_Watch is
 
-   type FS_Watch_Monitor (Server : access LSP.Servers.Server'Class) is
+   type FS_Watch_Monitor (Server : not null LSP.Servers.Server_Access) is
      limited new LSP.File_Monitors.File_Monitor with private;
 
 private
@@ -66,7 +66,7 @@ private
    end Monitor_Task;
    type Monitor_Task_Access is access Monitor_Task;
 
-   type FS_Watch_Monitor (Server : access LSP.Servers.Server'Class) is
+   type FS_Watch_Monitor (Server : not null LSP.Servers.Server_Access) is
      limited new LSP.File_Monitors.File_Monitor with
    record
       Filesystem_Monitor_Task : Monitor_Task_Access;

source/server/lsp-servers.ads

@@ -50,8 +50,8 @@ private with VSS.Stream_Element_Vectors;
 package LSP.Servers is
 
    type Server is limited
-     new LSP.Client_Message_Receivers.Client_Message_Receiver
-       with private;
+     new LSP.Client_Message_Receivers.Client_Message_Receiver with private;
+   type Server_Access is access all Server'Class with Storage_Size => 0;
    --  The representation of LSP server.
    --  Use methods of Client_Message_Receiver to send notifications, requests
    --  and responses to the LSP client.