------------------------------------------------------------------------------ -- -- -- 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, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, 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;