gcc/ada/tree_io.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              T R E E _ I O                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2012, 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 --  This package contains the routines used to read and write the tree files
  33 --  used by ASIS. Only the actual read and write routines are here. The open,
  34 --  create and close routines are elsewhere (in Osint in the compiler, and in
  35 --  the tree read driver for the tree read interface).
  36
  37 with Types;  use Types;
  38 with System; use System;
  39
  40 pragma Warnings (Off);
  41 --  This package is used also by gnatcoll
  42 with System.OS_Lib; use System.OS_Lib;
  43 pragma Warnings (On);
  44
  45 package Tree_IO is
  46
  47    Tree_Format_Error : exception;
  48    --  Raised if a format error is detected in the input file
  49
  50    ASIS_Version_Number : constant := 29;
  51    --  ASIS Version. This is used to check for consistency between the compiler
  52    --  used to generate trees and an ASIS application that is reading the
  53    --  trees. It must be incremented whenever a change is made to the tree
  54    --  format that would result in the compiler being incompatible with an
  55    --  older version of ASIS.
  56    --
  57    --  27  Changes in the tree structures for expression functions
  58    --  28  Changes in Snames
  59    --  29  Changes in Sem_Ch3 (tree copying in case of discriminant constraint
  60    --      for concurrent types).
  61
  62    procedure Tree_Read_Initialize (Desc : File_Descriptor);
  63    --  Called to initialize reading of a tree file. This call must be made
  64    --  before calls to Tree_Read_xx. No calls to Tree_Write_xx are permitted
  65    --  after this call.
  66
  67    procedure Tree_Read_Data (Addr : Address; Length : Int);
  68    --  Checks that the Length provided is the same as what has been provided
  69    --  to the corresponding Tree_Write_Data from the current tree file,
  70    --  Tree_Format_Error is raised if it is not the case. If Length is
  71    --  correct and non zero, reads Length bytes of information into memory
  72    --  starting at Addr from the current tree file.
  73
  74    procedure Tree_Read_Bool (B : out Boolean);
  75    --  Reads a single boolean value. The boolean value must have been written
  76    --  with a call to the Tree_Write_Bool procedure.
  77
  78    procedure Tree_Read_Char (C : out Character);
  79    --  Reads a single character. The character must have been written with a
  80    --  call to the Tree_Write_Char procedure.
  81
  82    procedure Tree_Read_Int (N : out Int);
  83    --  Reads a single integer value. The integer must have been written with
  84    --  a call to the Tree_Write_Int procedure.
  85
  86    procedure Tree_Read_Str (S : out String_Ptr);
  87    --  Read string, allocate on heap, and return pointer to allocated string
  88    --  which always has a lower bound of 1.
  89
  90    procedure Tree_Read_Terminate;
  91    --  Called after reading all data, checks that the buffer pointers is at
  92    --  the end of file, raising Tree_Format_Error if not.
  93
  94    procedure Tree_Write_Initialize (Desc : File_Descriptor);
  95    --  Called to initialize writing of a tree file. This call must be made
  96    --  before calls to Tree_Write_xx. No calls to Tree_Read_xx are permitted
  97    --  after this call.
  98
  99    procedure Tree_Write_Data (Addr : Address; Length : Int);
 100    --  Writes Length then, if Length is not null, Length bytes of data
 101    --  starting at Addr to current tree file
 102
 103    procedure Tree_Write_Bool (B : Boolean);
 104    --  Writes a single boolean value to the current tree file
 105
 106    procedure Tree_Write_Char (C : Character);
 107    --  Writes a single character to the current tree file
 108
 109    procedure Tree_Write_Int (N : Int);
 110    --  Writes a single integer value to the current tree file
 111
 112    procedure Tree_Write_Str (S : String_Ptr);
 113    --  Write out string value referenced by S (low bound of S must be 1)
 114
 115    procedure Tree_Write_Terminate;
 116    --  Terminates writing of the file (flushing the buffer), but does not
 117    --  close the file (the caller is responsible for closing the file).
 118
 119 end Tree_IO;