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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y M B O L S . P R O C E S S I N G --
-- --
-- B o d y --
-- --
-- Copyright (C) 2003-2005 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the VMS Alpha version of this package
separate (Symbols)
package body Processing is
type Number is mod 2**16;
-- 16 bits unsigned number for number of characters
GSD : constant Number := 10;
-- Code for the Global Symbol Definition section
C_SYM : constant Number := 1;
-- Code for a Symbol subsection
V_DEF_Mask : constant Number := 2**1;
V_NORM_Mask : constant Number := 2**6;
B : Byte;
Number_Of_Characters : Natural := 0;
-- The number of characters of each section
-- The following variables are used by procedure Process when reading an
-- object file.
Code : Number := 0;
Length : Natural := 0;
Dummy : Number;
Nchars : Natural := 0;
Flags : Number := 0;
Symbol : String (1 .. 255);
LSymb : Natural;
procedure Get (N : out Number);
-- Read two bytes from the object file LSB first as unsigned 16 bit number
procedure Get (N : out Natural);
-- Read two bytes from the object file, LSByte first, as a Natural
---------
-- Get --
---------
procedure Get (N : out Number) is
C : Byte;
LSByte : Number;
begin
Read (File, C);
LSByte := Byte'Pos (C);
Read (File, C);
N := LSByte + (256 * Byte'Pos (C));
end Get;
procedure Get (N : out Natural) is
Result : Number;
begin
Get (Result);
N := Natural (Result);
end Get;
-------------
-- Process --
-------------
procedure Process
(Object_File : String;
Success : out Boolean)
is
begin
-- Open the object file with Byte_IO. Return with Success = False if
-- this fails.
begin
Open (File, In_File, Object_File);
exception
when others =>
Put_Line
("*** Unable to open object file """ & Object_File & """");
Success := False;
return;
end;
-- Assume that the object file has a correct format
Success := True;
-- Get the different sections one by one from the object file
while not End_Of_File (File) loop
Get (Code);
Get (Number_Of_Characters);
Number_Of_Characters := Number_Of_Characters - 4;
-- If this is not a Global Symbol Definition section, skip to the
-- next section.
if Code /= GSD then
for J in 1 .. Number_Of_Characters loop
Read (File, B);
end loop;
else
-- Skip over the next 4 bytes
Get (Dummy);
Get (Dummy);
Number_Of_Characters := Number_Of_Characters - 4;
-- Get each subsection in turn
loop
Get (Code);
Get (Nchars);
Get (Dummy);
Get (Flags);
Number_Of_Characters := Number_Of_Characters - 8;
Nchars := Nchars - 8;
-- If this is a symbol and the V_DEF flag is set, get the
-- symbol.
if Code = C_SYM and then ((Flags and V_DEF_Mask) /= 0) then
-- First, reach the symbol length
for J in 1 .. 25 loop
Read (File, B);
Nchars := Nchars - 1;
Number_Of_Characters := Number_Of_Characters - 1;
end loop;
Length := Byte'Pos (B);
LSymb := 0;
-- Get the symbol characters
for J in 1 .. Nchars loop
Read (File, B);
Number_Of_Characters := Number_Of_Characters - 1;
if Length > 0 then
LSymb := LSymb + 1;
Symbol (LSymb) := B;
Length := Length - 1;
end if;
end loop;
-- Create the new Symbol
declare
S_Data : Symbol_Data;
begin
S_Data.Name := new String'(Symbol (1 .. LSymb));
-- The symbol kind (Data or Procedure) depends on the
-- V_NORM flag.
if (Flags and V_NORM_Mask) = 0 then
S_Data.Kind := Data;
else
S_Data.Kind := Proc;
end if;
-- Put the new symbol in the table
Symbol_Table.Increment_Last (Complete_Symbols);
Complete_Symbols.Table
(Symbol_Table.Last (Complete_Symbols)) := S_Data;
end;
else
-- As it is not a symbol subsection, skip to the next
-- subsection.
for J in 1 .. Nchars loop
Read (File, B);
Number_Of_Characters := Number_Of_Characters - 1;
end loop;
end if;
-- Exit the GSD section when number of characters reaches 0
exit when Number_Of_Characters = 0;
end loop;
end if;
end loop;
-- The object file has been processed, close it
Close (File);
exception
-- For any exception, output an error message, close the object file
-- and return with Success = False.
when X : others =>
Put_Line ("unexpected exception raised while processing """
& Object_File & """");
Put_Line (Exception_Information (X));
Close (File);
Success := False;
end Process;
end Processing;
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