stackframe.h

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/*
 *  stackframe.h - a usecode interpreter stack frame
 *
 *  Copyright (C) 2002  The Exult Team
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _STACKFRAME_H
#define _STACKFRAME_H

#include "exult_types.h"
#include <iosfwd>

class Usecode_function;
class Game_object;
class Usecode_value;

class Stack_frame
{
 public:
  Stack_frame(Usecode_function *fun, int event,
        Game_object *caller, int chain, int depth);
  ~Stack_frame();

  Usecode_function *function;
  uint8 *ip; // current IP
  uint8 *data; // pointer to start of data segment
  uint8 *externs; // pointer to start of externs
  uint8 *code; // pointer to (actual) code
  uint8 *endp; // pointer directly past code segment
  int line_number; // if debugging info present

  // should probably add source filename?

  int call_chain; // unique ID for this call chain
  int call_depth; // zero for top level function

  int num_externs;
  int num_args;
  int num_vars;
  Usecode_value *locals;

  int eventid;
  Game_object *caller_item;

  Usecode_value *save_sp;

  static int LastCallChainID;
  static int getCallChainID() { return ++LastCallChainID; }
};

std::ostream& operator<<(std::ostream& out, Stack_frame& val);

#endif

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