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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 O R A G E _ P O O L S --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 with Ada.Finalization;
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37 with System.Storage_Elements;
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38
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39 package System.Storage_Pools is
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40 pragma Preelaborate;
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41
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42 type Root_Storage_Pool is abstract
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43 new Ada.Finalization.Limited_Controlled with private;
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44 pragma Preelaborable_Initialization (Root_Storage_Pool);
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45
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46 procedure Allocate
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47 (Pool : in out Root_Storage_Pool;
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48 Storage_Address : out System.Address;
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49 Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
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50 Alignment : System.Storage_Elements.Storage_Count)
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51 is abstract;
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52
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53 procedure Deallocate
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54 (Pool : in out Root_Storage_Pool;
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55 Storage_Address : System.Address;
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56 Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
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57 Alignment : System.Storage_Elements.Storage_Count)
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58 is abstract;
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59
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60 function Storage_Size
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61 (Pool : Root_Storage_Pool)
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62 return System.Storage_Elements.Storage_Count
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63 is abstract;
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64
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65 private
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66 type Root_Storage_Pool is abstract
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67 new Ada.Finalization.Limited_Controlled with null record;
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68
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69 type Root_Storage_Pool_Ptr is access all Root_Storage_Pool'Class;
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70 for Root_Storage_Pool_Ptr'Storage_Size use 0;
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71 -- Type of the BIP_Storage_Pool extra parameter (see Exp_Ch6). The
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72 -- Storage_Size clause is necessary, because otherwise we have a
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73 -- chicken&egg problem; we can't be creating collection finalization code
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74 -- in this low-level package, because that involves Pool_Global, which
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75 -- imports this package.
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76
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77 -- ??? Are these two still needed? It might be possible to use Subpools.
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78 -- Allocate_Any_Controlled / Deallocate_Any_Controlled for non-controlled
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79 -- objects.
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80
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81 -- The following two procedures support the use of class-wide pool
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82 -- objects in storage pools. When a local type is given a class-wide
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83 -- storage pool, allocation and deallocation for the type must dispatch
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84 -- to the operation of the specific pool, which is achieved by a call
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85 -- to these procedures. (When the pool type is specific, the back-end
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86 -- generates a call to the statically identified operation of the type).
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87
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88 procedure Allocate_Any
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89 (Pool : in out Root_Storage_Pool'Class;
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90 Storage_Address : out System.Address;
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91 Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
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92 Alignment : System.Storage_Elements.Storage_Count);
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93
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94 procedure Deallocate_Any
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95 (Pool : in out Root_Storage_Pool'Class;
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96 Storage_Address : System.Address;
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97 Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
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98 Alignment : System.Storage_Elements.Storage_Count);
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99
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100 end System.Storage_Pools;
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