gcc/ada/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) 1995-2008, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 pragma Warnings (Off);
  35 pragma Compiler_Unit;
  36 pragma Warnings (On);
  37
  38 --  The purpose of this body is simply to ensure that the two with'ed units
  39 --  are properly included in the link. They are not with'ed from the spec
  40 --  of System.Standard_Library, since this would cause order of elaboration
  41 --  problems (Elaborate_Body would have the same problem).
  42
  43 pragma Polling (Off);
  44 --  We must turn polling off for this unit, because otherwise we get
  45 --  elaboration circularities with Ada.Exceptions if polling is on.
  46
  47 pragma Warnings (Off);
  48 --  Kill warnings from unused withs
  49
  50 with System.Soft_Links;
  51 --  Referenced directly from generated code using external symbols so it
  52 --  must always be present in a build, even if no unit has a direct with
  53 --  of this unit. Also referenced from exception handling routines.
  54 --  This is needed for programs that don't use exceptions explicitly but
  55 --  direct calls to Ada.Exceptions are generated by gigi (for example,
  56 --  by calling __gnat_raise_constraint_error directly).
  57
  58 with System.Memory;
  59 --  Referenced directly from generated code using external symbols, so it
  60 --  must always be present in a build, even if no unit has a direct with
  61 --  of this unit.
  62
  63 pragma Warnings (On);
  64
  65 package body System.Standard_Library is
  66
  67    Runtime_Finalized : Boolean := False;
  68    --  Set to True when adafinal is called. Used to ensure that subsequent
  69    --  calls to adafinal after the first have no effect.
  70
  71    --------------------------
  72    -- Abort_Undefer_Direct --
  73    --------------------------
  74
  75    procedure Abort_Undefer_Direct is
  76    begin
  77       System.Soft_Links.Abort_Undefer.all;
  78    end Abort_Undefer_Direct;
  79
  80    --------------
  81    -- Adafinal --
  82    --------------
  83
  84    procedure Adafinal is
  85    begin
  86       if not Runtime_Finalized then
  87          Runtime_Finalized := True;
  88          System.Soft_Links.Adafinal.all;
  89       end if;
  90    end Adafinal;
  91
  92    -----------------
  93    -- Break_Start --
  94    -----------------
  95
  96    procedure Break_Start;
  97    pragma Export (C, Break_Start, "__gnat_break_start");
  98    --  This is a dummy procedure that is called at the start of execution.
  99    --  Its sole purpose is to provide a well defined point for the placement
 100    --  of a main program breakpoint.
 101
 102    procedure Break_Start is
 103    begin
 104       null;
 105    end Break_Start;
 106
 107 end System.Standard_Library;