gcc/ada/libgnat/s-stalib.adb

   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) 1995-2018, 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
  32 pragma 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
  39 pragma 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
  43 pragma 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
  47 with 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
  55 with 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
  60 pragma Warnings (On);
  61
  62 package 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
 105 end System.Standard_Library;