fpc/compiler/rasm.pas

{
    Copyright (c) 1998-2003 by Peter Vreman, Florian Klaempfl and Carl Eric Codere

    Basic stuff for assembler readers

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT 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
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ****************************************************************************
}
unit rasm;

{$i fpcdefs.inc}

  interface

    uses
      cclasses,
      rabase,
      aasmbase,
      aasmdata,
      cpubase,
      cgbase;

    type
       tasmreader = class(tbaseasmreader)
         firsttoken     : boolean;
         _asmsorted     : boolean;
         curlist        : TAsmList;
         c              : char;
         actasmpattern  : string;
         actopcode      : tasmop;
         actasmregister : tregister;
         actcondition   : tasmcond;
         iasmops        : TFPHashList;
         locallabels    : TFPHashObjectList;
         constructor create;override;
         destructor destroy;override;
         function createlocallabel(const s: string; var hl: tasmlabel; emit: boolean): boolean;
         procedure checklocallabels;
       end;

  implementation

    uses
      verbose;

    type
      TLocalLabel = class(TFPHashObject)
        emitted: boolean;
        lab: tasmlabel;
        function Gettasmlabel: tasmlabel;
      end;


    function TLocalLabel.Gettasmlabel:tasmlabel;
      begin
        if not assigned(lab) then
         begin
           current_asmdata.getjumplabel(lab);
           { this label is forced to be used so it's always written }
           lab.increfs;
         end;
        result:=lab;
      end;


    constructor tasmreader.create;
      begin
        inherited create;
        firsttoken:=true;
        locallabels:=TFPHashObjectList.create;
      end;


    destructor tasmreader.destroy;
      begin
        locallabels.Free;
        iasmops.Free;
        inherited destroy;
      end;


    function tasmreader.createlocallabel(const s: string; var hl: tasmlabel; emit:boolean):boolean;
      var
        lab: TLocalLabel;
      begin
        result:=true;
        { Check if it already is defined }
        lab:=TLocalLabel(locallabels.Find(s));
        if not assigned(lab) then
          lab:=TLocalLabel.Create(locallabels,s);
        { set emitted flag and check for dup syms }
        if emit then
          begin
            if lab.Emitted then
              begin
                Message1(asmr_e_dup_local_sym,lab.Name);
                result:=false;
              end;
            lab.Emitted:=true;
          end;
        hl:=lab.Gettasmlabel;
      end;


    procedure tasmreader.checklocallabels;
      var
        i: longint;
        lab: TLocalLabel;
      begin
        for i:=0 to locallabels.Count-1 do
          begin
            lab:=TLocalLabel(locallabels[i]);
            if not lab.emitted then
              Message1(asmr_e_unknown_label_identifier,lab.name);
          end;
        locallabels.Clear;
      end;

end.