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Added gforth_free_stacks() and gforth_free()

/* header file for libcc-generated C code

  Copyright (C) 2006,2007,2008 Free Software Foundation, Inc.

  This file is part of Gforth.

  Gforth 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 3
  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, see http://www.gnu.org/licenses/.
*/

#include <gforth/@PACKAGE_VERSION@/config.h>

#if defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) || defined(__ANDROID__)
#undef HAS_BACKLINK
#else
#define HAS_BACKLINK 1
#endif

typedef CELL_TYPE Cell;
typedef unsigned char Char;
typedef double Float;
typedef Char *Address;
typedef void **Xt;

#define Clongest long long
typedef unsigned Clongest UClongest;

typedef struct {
  Cell next_task;
  Cell prev_task;
  Cell save_task;
  Cell* sp0;
  Cell* rp0;
  Float* fp0;
  Address lp0;
  Xt *throw_entry;
} user_area;

#ifdef HAS_BACKLINK
extern __thread Cell *gforth_SP;
extern __thread Float *gforth_FP;
extern __thread Cell *gforth_RP;
extern __thread char *gforth_LP;
extern __thread char *gforth_UP;
extern void *gforth_engine(void *);
extern char *cstr(char *from, Cell size);
extern char *tilde_cstr(char *from, Cell size);
extern __thread void *throw_jmp_handler;
extern user_area* gforth_stacks(Cell dsize, Cell rsize, Cell fsize, Cell lsize);
extern void gforth_free_stacks(user_area* t);
#define GFORTH_ARGS void
#else
#define gforth_SP *((Cell **)(gforth_pointers(0)))
#define gforth_FP *((Float **)(gforth_pointers(1)))
#define gforth_LP *((char **)(gforth_pointers(2)))
#define gforth_RP *((Cell **)(gforth_pointers(3)))
#define gforth_UP *((char **)(gforth_pointers(4)))
#define gforth_engine ((char *(*)(void *))gforth_pointers(5))
#define cstr ((char *(*)(char *, Cell))gforth_pointers(6))
#define tilde_cstr ((char *(*)(char *, Cell))gforth_pointers(7))
#define throw_jmp_handler *((void**)(gforth_pointers(8)))
#define gforth_stacks ((user_area *(*)(Cell, Cell, Cell, Cell))gforth_pointers(9))
#define gforth_free_stacks ((void(*)(user_area* t))gforth_pointers(10))
#define GFORTH_ARGS void *(*gforth_pointers)(Cell)
#endif

#define CELL_BITS	(sizeof(Cell) * 8)

#define gforth_d2ll(lo,hi) \
  ((sizeof(Cell) < sizeof(Clongest)) \
   ? (((UClongest)(lo))|(((UClongest)(hi))<<CELL_BITS)) \
   : (lo))

#define gforth_ll2d(ll,lo,hi) \
  do { \
    UClongest _ll = (ll); \
    (lo) = (Cell)_ll; \
    (hi) = ((sizeof(Cell) < sizeof(Clongest)) \
            ? (_ll >> CELL_BITS) \
            : 0); \
  } while (0);