1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--              S Y S T E M . S T A N D A R D _ L I B R A R Y               --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1995-2013, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32pragma Compiler_Unit_Warning;
33
34--  The purpose of this body is simply to ensure that the two with'ed units
35--  are properly included in the link. They are not with'ed from the spec
36--  of System.Standard_Library, since this would cause order of elaboration
37--  problems (Elaborate_Body would have the same problem).
38
39pragma Polling (Off);
40--  We must turn polling off for this unit, because otherwise we get
41--  elaboration circularities with Ada.Exceptions if polling is on.
42
43pragma Warnings (Off);
44--  Kill warnings from unused withs. These unused with's are here to make
45--  sure the relevant units are loaded and properly elaborated.
46
47with System.Soft_Links;
48--  Referenced directly from generated code using external symbols so it
49--  must always be present in a build, even if no unit has a direct with
50--  of this unit. Also referenced from exception handling routines.
51--  This is needed for programs that don't use exceptions explicitly but
52--  direct calls to Ada.Exceptions are generated by gigi (for example,
53--  by calling __gnat_raise_constraint_error directly).
54
55with System.Memory;
56--  Referenced directly from generated code using external symbols, so it
57--  must always be present in a build, even if no unit has a direct with
58--  of this unit.
59
60pragma Warnings (On);
61
62package body System.Standard_Library is
63
64   Runtime_Finalized : Boolean := False;
65   --  Set to True when adafinal is called. Used to ensure that subsequent
66   --  calls to adafinal after the first have no effect.
67
68   --------------------------
69   -- Abort_Undefer_Direct --
70   --------------------------
71
72   procedure Abort_Undefer_Direct is
73   begin
74      System.Soft_Links.Abort_Undefer.all;
75   end Abort_Undefer_Direct;
76
77   --------------
78   -- Adafinal --
79   --------------
80
81   procedure Adafinal is
82   begin
83      if not Runtime_Finalized then
84         Runtime_Finalized := True;
85         System.Soft_Links.Adafinal.all;
86      end if;
87   end Adafinal;
88
89   -----------------
90   -- Break_Start --
91   -----------------
92
93   procedure Break_Start;
94   pragma Export (C, Break_Start, "__gnat_break_start");
95   --  This is a dummy procedure that is called at the start of execution.
96   --  Its sole purpose is to provide a well defined point for the placement
97   --  of a main program breakpoint. This is not used anymore but kept for
98   --  bootstrapping issues (still referenced by old gnatbind generated files).
99
100   procedure Break_Start is
101   begin
102      null;
103   end Break_Start;
104
105end System.Standard_Library;
106