/* common header file

  Copyright (C) 1995,1996,1997,1998,2000 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 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, USA.
*/

#include "config.h"
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>

#if defined(DOUBLY_INDIRECT)||defined(INDIRECT_THREADED)||defined(VM_PROFILING)
#define NO_DYNAMIC
#endif

#if defined(DOUBLY_INDIRECT)
#  undef DIRECT_THREADED
#  undef INDIRECT_THREADED
#  define INDIRECT_THREADED
#endif

#if defined(GFORTH_DEBUGGING)
#  undef USE_TOS
#  undef USE_FTOS
#  define USE_NO_TOS
#  define USE_NO_FTOS
#endif

#include <limits.h>

#if defined(NeXT)
#  include <libc.h>
#endif /* NeXT */

/* symbol indexed constants */

#define DOCOL	0
#define DOCON	1
#define DOVAR	2
#define DOUSER	3
#define DODEFER	4
#define DOFIELD	5
#define DODOES	6
#define DOESJUMP	7

/* the size of the DOESJUMP, which resides between DOES> and the does-code */
#define DOES_HANDLER_SIZE	(2*sizeof(Cell))

#include "machine.h"

/* Forth data types */
/* Cell and UCell must be the same size as a pointer */
#define CELL_BITS	(sizeof(Cell) * CHAR_BIT)
#define FLAG(b) (-(b))
#define FILEIO(error)	(FLAG(error) & -37)
#define FILEEXIST(error)	(FLAG(error) & -38)

#define F_TRUE (FLAG(0==0))
#define F_FALSE (FLAG(0!=0))

#ifdef BUGGY_LONG_LONG
typedef struct {
  Cell hi;
  UCell lo;
} DCell;

typedef struct {
  UCell hi;
  UCell lo;
} UDCell;

#if SMALL_OFF_T
#define OFF2UD(o) ({UDCell _ud; _ud.hi=0; _ud.lo=(Cell)(o); _ud;})
#define UD2OFF(ud) ((ud).lo)
#else /* !SMALL_OFF_T */
#define OFF2UD(o) ({UDCell _ud; off_t _o=(o); _ud.hi=_o>>CELL_BITS; _ud.lo=(Cell)_o; _ud;})
#define UD2OFF(ud) ({UDCell _ud=(ud); (((off_t)_ud.hi)<<CELL_BITS)+_ud.lo;})
#endif /* !SMALL_OFF_T */
#define DZERO		((DCell){0,0})

#else /* ! defined(BUGGY_LONG_LONG) */

/* DCell and UDCell must be twice as large as Cell */
typedef DOUBLE_CELL_TYPE DCell;
typedef unsigned DOUBLE_CELL_TYPE UDCell;

#define OFF2UD(o)	((UDCell)(o))
#define UD2OFF(ud)	((off_t)(ud))
#define DZERO		((DCell)0)

#endif /* ! defined(BUGGY_LONG_LONG) */

typedef union {
  struct {
#if defined(WORDS_BIGENDIAN)||defined(BUGGY_LONG_LONG)
    Cell high;
    UCell low;
#else
    UCell low;
    Cell high;
#endif
  } cells;
  DCell d;
  UDCell ud;
} Double_Store;

#define FETCH_DCELL_T(d_,lo,hi,t_)	({ \
				     Double_Store _d; \
				     _d.cells.low = (lo); \
				     _d.cells.high = (hi); \
				     (d_) = _d.t_; \
				 })

#define STORE_DCELL_T(d_,lo,hi,t_)	({ \
				     Double_Store _d; \
				     _d.t_ = (d_); \
				     (lo) = _d.cells.low; \
				     (hi) = _d.cells.high; \
				 })

#define vm_twoCell2d(lo,hi,d_)  FETCH_DCELL_T(d_,lo,hi,d);
#define vm_twoCell2ud(lo,hi,d_) FETCH_DCELL_T(d_,lo,hi,ud);

#define vm_d2twoCell(d_,lo,hi)  STORE_DCELL_T(d_,lo,hi,d);
#define vm_ud2twoCell(d_,lo,hi) STORE_DCELL_T(d_,lo,hi,ud);

typedef Label *Xt;

/* PFA gives the parameter field address corresponding to a cfa */
#define PFA(cfa)	(((Cell *)cfa)+2)
/* PFA1 is a special version for use just after a NEXT1 */
#define PFA1(cfa)	PFA(cfa)
/* CODE_ADDRESS is the address of the code jumped to through the code field */
#define CODE_ADDRESS(cfa)	(*(Xt)(cfa))

/* DOES_CODE is the Forth code does jumps to */
#if !defined(DOUBLY_INDIRECT)
#  define DOES_CA (symbols[DODOES])
#else /* defined(DOUBLY_INDIRECT) */
#  define DOES_CA ((Label)&xts[DODOES])
#endif /* defined(DOUBLY_INDIRECT) */



#define DOES_CODE1(cfa)	((Xt *)(cfa[1]))
/* MAKE_CF creates an appropriate code field at the cfa;
   ca is the code address */
#define MAKE_CF(cfa,ca) ((*(Label *)(cfa)) = ((Label)ca))
/* make a code field for a defining-word-defined word */
#define MAKE_DOES_CF(cfa,does_code)  ({MAKE_CF(cfa,DOES_CA);	\
				       ((Cell *)cfa)[1] = (Cell)(does_code);})
/* the does handler resides between DOES> and the following Forth code */
/* not needed in indirect threaded code */
#if defined(DOUBLY_INDIRECT)
#define MAKE_DOES_HANDLER(addr)	MAKE_CF(addr, ((Label)&symbols[DOESJUMP]))
#else /* !defined(DOUBLY_INDIRECT) */
#define MAKE_DOES_HANDLER(addr)	((void)0)
#endif /* !defined(DOUBLY_INDIRECT) */

#ifdef GFORTH_DEBUGGING
#define NAME(string) { saved_ip=ip; asm(""); }
/* the asm here is to avoid reordering of following stuff above the
   assignment; this is an old-style asm (no operands), and therefore
   is treated like "asm volatile ..."; i.e., it prevents most
   reorderings across itself.  We want the assignment above first,
   because the stack loads may already cause a stack underflow. */
#elif DEBUG
#	define	NAME(string)	fprintf(stderr,"%08lx: "string"\n",(Cell)ip);
#else
#	define	NAME(string)
#endif

#define CF(const)	(-const-2)

#define CF_NIL	-1

#ifndef FLUSH_ICACHE
#warning flush-icache probably will not work (see manual)
#	define FLUSH_ICACHE(addr,size)
#endif

#ifdef USE_TOS
#define IF_spTOS(x) x
#else
#define IF_spTOS(x)
#define spTOS (sp[0])
#endif

#ifdef USE_FTOS
#define IF_fpTOS(x) x
#else
#define IF_fpTOS(x)
#define fpTOS (fp[0])
#endif

#define IF_rpTOS(x)
#define rpTOS (rp[0])

typedef struct {
  Address base;		/* base address of image (0 if relocatable) */
  UCell checksum;	/* checksum of ca's to protect against some
			   incompatible	binary/executable combinations
			   (0 if relocatable) */
  UCell image_size;	/* all sizes in bytes */
  UCell dict_size;
  UCell data_stack_size;
  UCell fp_stack_size;
  UCell return_stack_size;
  UCell locals_stack_size;
  Xt *boot_entry;	/* initial ip for booting (in BOOT) */
  Xt *throw_entry;	/* ip after signal (in THROW) */
  Cell unused1;		/* possibly tib stack size */
  Label *xt_base;         /* base of DOUBLE_INDIRECT xts[], for comp-i.fs */
  Address data_stack_base; /* this and the following fields are initialized by the loader */
  Address fp_stack_base;
  Address return_stack_base;
  Address locals_stack_base;
} ImageHeader;
/* the image-header is created in main.fs */

Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp);
Label *engine2(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp);
Label *engine3(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp);
Address my_alloc(Cell size);
char *cstr(Char *from, UCell size, int clear);
char *tilde_cstr(Char *from, UCell size, int clear);
DCell timeval2us(struct timeval *tvp);

/* dblsub routines */
DCell dnegate(DCell d1);
UDCell ummul (UCell a, UCell b);
DCell mmul (Cell a, Cell b);
UDCell umdiv (UDCell u, UCell v);
DCell smdiv (DCell num, Cell denom);
DCell fmdiv (DCell num, Cell denom);

Cell memcasecmp(const Char *s1, const Char *s2, Cell n);

/* peephole routines */

Xt *primtable(Label symbols[], Cell size);
Cell prepare_peephole_table(Xt xts[]);
Xt peephole_opt(Xt xt1, Xt xt2, Cell peeptable);
void vm_print_profile(FILE *file);
void vm_count_block(Xt *ip);

/* dynamic superinstruction stuff */
Label compile_prim(Label prim);
void compile_prim1(Cell *start);
void finish_code(void);
int forget_dyncode(Address code);
Label decompile_code(Label prim);

extern int offset_image;
extern int die_on_signal;
extern UCell pagesize;
extern ImageHeader *gforth_header;
extern Label *vm_prims;
extern Label *xts;
extern Cell npriminfos;

#ifdef HAS_DEBUG
extern int debug;
#else
# define debug 0
#endif

extern Cell *SP;
extern Float *FP;
extern Address UP;

#ifdef GFORTH_DEBUGGING
extern Xt *saved_ip;
extern Cell *rp;
#endif

#ifdef NO_IP
extern Label next_code;
#endif

#ifdef HAS_FILE
extern char* fileattr[6];
extern char* pfileattr[6];
extern int ufileattr[6];
#endif

#ifdef PRINT_SUPER_LENGTHS
Cell prim_length(Cell prim);
void print_super_lengths();
#endif

/* declare all the functions that are missing */
#ifndef HAVE_ATANH
extern double atanh(double r1);
extern double asinh(double r1);
extern double acosh(double r1);
#endif
#ifndef HAVE_ECVT
/* extern char* ecvt(double x, int len, int* exp, int* sign);*/
#endif
#ifndef HAVE_MEMMOVE
/* extern char *memmove(char *dest, const char *src, long n); */
#endif
#ifndef HAVE_POW10
extern double pow10(double x);
#endif
#ifndef HAVE_STRERROR
extern char *strerror(int err);
#endif
#ifndef HAVE_STRSIGNAL
extern char *strsignal(int sig);
#endif
#ifndef HAVE_STRTOUL
extern unsigned long int strtoul(const char *nptr, char **endptr, int base);
#endif


#define GROUP(x, n)