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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . S T A N D A R D _ L I B R A R Y --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1995-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 pragma Compiler_Unit_Warning;
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33
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34 -- The purpose of this body is simply to ensure that the two with'ed units
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35 -- are properly included in the link. They are not with'ed from the spec
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36 -- of System.Standard_Library, since this would cause order of elaboration
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37 -- problems (Elaborate_Body would have the same problem).
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38
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39 pragma Polling (Off);
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40 -- We must turn polling off for this unit, because otherwise we get
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41 -- elaboration circularities with Ada.Exceptions if polling is on.
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42
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43 pragma Warnings (Off);
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44 -- Kill warnings from unused withs. These unused with's are here to make
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45 -- sure the relevant units are loaded and properly elaborated.
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46
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47 with System.Soft_Links;
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48 -- Referenced directly from generated code using external symbols so it
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49 -- must always be present in a build, even if no unit has a direct with
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50 -- of this unit. Also referenced from exception handling routines.
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51 -- This is needed for programs that don't use exceptions explicitly but
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52 -- direct calls to Ada.Exceptions are generated by gigi (for example,
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53 -- by calling __gnat_raise_constraint_error directly).
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54
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55 with System.Memory;
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56 -- Referenced directly from generated code using external symbols, so it
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57 -- must always be present in a build, even if no unit has a direct with
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58 -- of this unit.
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59
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60 pragma Warnings (On);
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61
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62 package body System.Standard_Library is
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63
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64 Runtime_Finalized : Boolean := False;
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65 -- Set to True when adafinal is called. Used to ensure that subsequent
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66 -- calls to adafinal after the first have no effect.
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67
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68 --------------------------
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69 -- Abort_Undefer_Direct --
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70 --------------------------
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71
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72 procedure Abort_Undefer_Direct is
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73 begin
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74 System.Soft_Links.Abort_Undefer.all;
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75 end Abort_Undefer_Direct;
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76
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77 --------------
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78 -- Adafinal --
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79 --------------
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80
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81 procedure Adafinal is
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82 begin
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83 if not Runtime_Finalized then
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84 Runtime_Finalized := True;
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85 System.Soft_Links.Adafinal.all;
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86 end if;
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87 end Adafinal;
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88
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89 -----------------
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90 -- Break_Start --
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91 -----------------
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92
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93 procedure Break_Start;
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94 pragma Export (C, Break_Start, "__gnat_break_start");
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95 -- This is a dummy procedure that is called at the start of execution.
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96 -- Its sole purpose is to provide a well defined point for the placement
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97 -- of a main program breakpoint. This is not used anymore but kept for
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98 -- bootstrapping issues (still referenced by old gnatbind generated files).
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99
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100 procedure Break_Start is
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101 begin
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102 null;
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103 end Break_Start;
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104
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105 end System.Standard_Library;
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