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) 1992-1999 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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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 --  This package contains the routines used to read and write the tree files
  35 --  used by ASIS. Only the actual read and write routines are here. The open,
  36 --  create and close routines are elsewhere (in Osint in the compiler, and in
  37 --  the tree read driver for the tree read interface).
  38
  39 with GNAT.OS_Lib; use GNAT.OS_Lib;
  40 with System;      use System;
  41 with Types;       use Types;
  42
  43 package Tree_IO is
  44
  45    Tree_Format_Error : exception;
  46    --  Raised if a format error is detected in the input file
  47
  48    procedure Tree_Read_Initialize (Desc : File_Descriptor);
  49    --  Called to initialize reading of a tree file. This call must be made
  50    --  before calls to Tree_Read_xx. No calls to Tree_Write_xx are permitted
  51    --  after this call.
  52
  53    procedure Tree_Read_Data (Addr : Address; Length : Int);
  54    --  Checks that the Length provided is the same as what has been provided
  55    --  to the corresponding Tree_Write_Data from the current tree file,
  56    --  Tree_Format_Error is raised if it is not the case. If Length is
  57    --  correct and non zero, reads Length bytes of information into memory
  58    --  starting at Addr from the current tree file.
  59
  60    procedure Tree_Read_Bool (B : out Boolean);
  61    --  Reads a single boolean value. The boolean value must have been written
  62    --  with a call to the Tree_Write_Bool procedure.
  63
  64    procedure Tree_Read_Char (C : out Character);
  65    --  Reads a single character. The character must have been written with a
  66    --  call to the Tree_Write_Char procedure.
  67
  68    procedure Tree_Read_Int (N : out Int);
  69    --  Reads a single integer value. The integer must have been written with
  70    --  a call to the Tree_Write_Int procedure.
  71
  72    procedure Tree_Read_Str (S : out String_Ptr);
  73    --  Read string, allocate on heap, and return pointer to allocated string
  74    --  which always has a lower bound of 1.
  75
  76    procedure Tree_Read_Terminate;
  77    --  Called after reading all data, checks that the buffer pointers is at
  78    --  the end of file, raising Tree_Format_Error if not.
  79
  80    procedure Tree_Write_Initialize (Desc : File_Descriptor);
  81    --  Called to initialize writing of a tree file. This call must be made
  82    --  before calls to Tree_Write_xx. No calls to Tree_Read_xx are permitted
  83    --  after this call.
  84
  85    procedure Tree_Write_Data (Addr : Address; Length : Int);
  86    --  Writes Length then, if Length is not null, Length bytes of data
  87    --  starting at Addr to current tree file
  88
  89    procedure Tree_Write_Bool (B : Boolean);
  90    --  Writes a single boolean value to the current tree file
  91
  92    procedure Tree_Write_Char (C : Character);
  93    --  Writes a single character to the current tree file
  94
  95    procedure Tree_Write_Int (N : Int);
  96    --  Writes a single integer value to the current tree file
  97
  98    procedure Tree_Write_Str (S : String_Ptr);
  99    --  Write out string value referenced by S. Low bound must be 1.
 100
 101    procedure Tree_Write_Terminate;
 102    --  Terminates writing of the file (flushing the buffer), but does not
 103    --  close the file (the caller is responsible for closing the file).
 104
 105 end Tree_IO;