/******************************************************************************
  Copyright (c) 1992, 1995, 1996 Xerox Corporation.  All rights reserved.
  Portions of this code were written by Stephen White, aka ghond.
  Use and copying of this software and preparation of derivative works based
  upon this software are permitted.  Any distribution of this software or
  derivative works must comply with all applicable United States export
  control laws.  This software is made available AS IS, and Xerox Corporation
  makes no warranty about the software, its performance or its conformity to
  any specification.  Any person obtaining a copy of this software is requested
  to send their name and post office or electronic mail address to:
    Pavel Curtis
    Xerox PARC
    3333 Coyote Hill Rd.
    Palo Alto, CA 94304
    Pavel@Xerox.Com
 *****************************************************************************/

#ifndef Program_H
#define Program_H

#include "structures.h"
#include "version.h"

typedef unsigned char Byte;

typedef struct {
    Byte	numbytes_label, numbytes_literal, numbytes_fork,
		numbytes_var_name, numbytes_stack;
    Byte       *vector;
    unsigned 	size;
    unsigned 	max_stack;
} Bytecodes;

typedef struct {
    DB_Version	 version;
    unsigned     first_lineno;
    unsigned     ref_count;

    Bytecodes    main_vector;

    unsigned     num_literals;
    Var         *literals;

    unsigned     fork_vectors_size;
    Bytecodes   *fork_vectors;
  
    unsigned	 num_var_names;
    const char **var_names;
} Program;

#define MAIN_VECTOR 	-1	/* As opposed to an index into fork_vectors */

extern Program	       *new_program(void);
extern Program	       *null_program(void);
extern Program	       *program_ref(Program *);
extern int		program_bytes(Program *);
extern void		free_program(Program *);

#endif /* !Program_H */

/* $Log: program.h,v $
 * Revision 2.3  1996/02/08  06:14:19  pavel
 * Added version number on programs.  Updated copyright notice for 1996.
 * Release 1.8.0beta1.
 *
 * Revision 2.2  1995/12/31  03:13:02  pavel
 * Added numbytes_stack field to Bytecodes values.  Release 1.8.0alpha4.
 *
 * Revision 2.1  1995/12/11  08:03:22  pavel
 * Removed a useless macro definition.  Added `null_program()' and
 * `program_bytes()'.  Release 1.8.0alpha2.
 *
 * Revision 2.0  1995/11/30  04:54:29  pavel
 * New baseline version, corresponding to release 1.8.0alpha1.
 *
 * Revision 1.2  1992/10/23  23:03:47  pavel
 * Added copyright notice.
 *
 * Revision 1.1  1992/07/20  23:23:12  pavel
 * Initial RCS-controlled version.
 */