/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * generate line information for debugger
 *
 * Copyright 2006 Przemyslaw Czerpak < druzus /at/ priv.onet.pl >
 * www - http://www.harbour-project.org
 *
 * 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, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#include "hbcomp.h"

PHB_DEBUGINFO hb_compGetDebugInfo( HB_COMP_DECL )
{
   PHB_DEBUGINFO pLineInfo = NULL, pInfo = NULL;
   ULONG ulPos, ulSkip, ulLine, ulOffset;
   const char * pszModuleName = "", * ptr;
   PFUNCTION pFunc;

   pFunc = HB_COMP_PARAM->functions.pFirst;
   if( ! HB_COMP_PARAM->fStartProc )
      pFunc = pFunc->pNext;

   while( pFunc )
   {
      ulPos = ulLine = 0;
      while( ulPos < pFunc->lPCodePos )
      {
         ulSkip = 0;
         switch( pFunc->pCode[ ulPos ] )
         {
            case HB_P_LINE:
               ulLine = HB_PCODE_MKUSHORT( &pFunc->pCode[ ulPos + 1 ] );
               break;

            case HB_P_MODULENAME:
               pszModuleName = ( const char * ) &pFunc->pCode[ ulPos + 1 ];
               pInfo = NULL;
               break;

            /*
             * This enables checking also code block bodies,
             * if it's not necessary then simply remove the
             * code below. [druzus]
             */
            case HB_P_PUSHBLOCK:
               ulSkip = 7 + HB_PCODE_MKUSHORT( &pFunc->pCode[ ulPos + 5 ] ) * 2;
               break;

            case HB_P_PUSHBLOCKSHORT:
               ulSkip = 2;
               break;
         }

         if( ulLine != 0 )
         {
            if( !pInfo )
            {
               int i;

               ptr = strchr( pszModuleName, ':' );
               i = ptr ? ( int ) ( ptr - pszModuleName ) : ( int ) strlen( pszModuleName );

               pInfo = pLineInfo;
               while( pInfo != NULL )
               {
                  if( strncmp( pszModuleName, pInfo->pszModuleName, i ) == 0 &&
                      ( pInfo->pszModuleName[ i ] == '\0' ||
                        pInfo->pszModuleName[ i ] == ':' ) )
                     break;
                  pInfo = pInfo->pNext;
               }
               if( !pInfo )
               {
                  pInfo = ( PHB_DEBUGINFO ) hb_xgrab( sizeof( HB_DEBUGINFO ) );
                  pInfo->pszModuleName = hb_strndup( pszModuleName, i );
                  pInfo->ulFirstLine = pInfo->ulLastLine = ulLine;
                  /*
                   * allocate memory in 256 bytes chunks (for 2048 lines)
                   * The last 1 byte is reserved for additional 0 byte if
                   * the caller will want to use the returned buffer as
                   * parameter to hb_compGenPushString(). [druzus]
                   */
                  pInfo->ulAllocated = ( ( ulLine >> 3 ) + 0x100 ) & 0xFFFFFF00L;
                  pInfo->pLineMap = ( BYTE * ) hb_xgrab( pInfo->ulAllocated + 1 );
                  memset( pInfo->pLineMap, 0, pInfo->ulAllocated + 1 );
                  pInfo->pNext = pLineInfo;
                  pLineInfo = pInfo;
               }
            }
            ulOffset = ulLine >> 3;
            if( pInfo->ulAllocated <= ulOffset )
            {
               ULONG ulNewSize = ( ( ulLine >> 3 ) + 0x100 ) & 0xFFFFFF00L;
               pInfo->pLineMap = ( BYTE * ) hb_xrealloc( pInfo->pLineMap, ulNewSize + 1 );
               memset( pInfo->pLineMap + pInfo->ulAllocated, 0, ulNewSize - pInfo->ulAllocated + 1 );
               pInfo->ulAllocated = ulNewSize;
            }
            pInfo->pLineMap[ ulOffset ] |= 1 << ( ulLine & 0x7 );
            /*
             * It's possible the the line number will be ascending
             * if some external file is included more then once. [druzus]
             */
            if( pInfo->ulFirstLine > ulLine )
               pInfo->ulFirstLine = ulLine;
            if( pInfo->ulLastLine < ulLine )
               pInfo->ulLastLine = ulLine;
            ulLine = 0;
         }

         if( ulSkip == 0 )
         {
            ulSkip = hb_compPCodeSize( pFunc, ulPos );
            if( ulSkip == 0 )
               break;
         }
         ulPos += ulSkip;
      }
      pFunc = pFunc->pNext;
   }

   return pLineInfo;
}