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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- T R E E _ I O --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package contains the routines used to read and write the tree files
-- used by ASIS. Only the actual read and write routines are here. The open,
-- create and close routines are elsewhere (in Osint in the compiler, and in
-- the tree read driver for the tree read interface).
with Types; use Types;
with System; use System;
with System.OS_Lib; use System.OS_Lib;
package Tree_IO is
Tree_Format_Error : exception;
-- Raised if a format error is detected in the input file
ASIS_Version_Number : constant := 23;
-- ASIS Version. This is used to check for consistency between the compiler
-- used to generate trees and an ASIS application that is reading the
-- trees. It must be incremented whenever a change is made to the tree
-- format that would result in the compiler being incompatible with an
-- older version of ASIS.
procedure Tree_Read_Initialize (Desc : File_Descriptor);
-- Called to initialize reading of a tree file. This call must be made
-- before calls to Tree_Read_xx. No calls to Tree_Write_xx are permitted
-- after this call.
procedure Tree_Read_Data (Addr : Address; Length : Int);
-- Checks that the Length provided is the same as what has been provided
-- to the corresponding Tree_Write_Data from the current tree file,
-- Tree_Format_Error is raised if it is not the case. If Length is
-- correct and non zero, reads Length bytes of information into memory
-- starting at Addr from the current tree file.
procedure Tree_Read_Bool (B : out Boolean);
-- Reads a single boolean value. The boolean value must have been written
-- with a call to the Tree_Write_Bool procedure.
procedure Tree_Read_Char (C : out Character);
-- Reads a single character. The character must have been written with a
-- call to the Tree_Write_Char procedure.
procedure Tree_Read_Int (N : out Int);
-- Reads a single integer value. The integer must have been written with
-- a call to the Tree_Write_Int procedure.
procedure Tree_Read_Str (S : out String_Ptr);
-- Read string, allocate on heap, and return pointer to allocated string
-- which always has a lower bound of 1.
procedure Tree_Read_Terminate;
-- Called after reading all data, checks that the buffer pointers is at
-- the end of file, raising Tree_Format_Error if not.
procedure Tree_Write_Initialize (Desc : File_Descriptor);
-- Called to initialize writing of a tree file. This call must be made
-- before calls to Tree_Write_xx. No calls to Tree_Read_xx are permitted
-- after this call.
procedure Tree_Write_Data (Addr : Address; Length : Int);
-- Writes Length then, if Length is not null, Length bytes of data
-- starting at Addr to current tree file
procedure Tree_Write_Bool (B : Boolean);
-- Writes a single boolean value to the current tree file
procedure Tree_Write_Char (C : Character);
-- Writes a single character to the current tree file
procedure Tree_Write_Int (N : Int);
-- Writes a single integer value to the current tree file
procedure Tree_Write_Str (S : String_Ptr);
-- Write out string value referenced by S (low bound of S must be 1)
procedure Tree_Write_Terminate;
-- Terminates writing of the file (flushing the buffer), but does not
-- close the file (the caller is responsible for closing the file).
end Tree_IO;
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