/*
$Id: engine.c,v 1.1 1994/02/11 16:30:46 anton Exp $
Copyright 1992 by the ANSI figForth Development Group
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <stdlib.h>
#include "forth.h"
#include "io.h"
extern unlink(char *);
extern ftruncate(int, int);
typedef union {
struct {
#ifdef BIG_ENDIAN
Cell high;
Cell low;
#else
Cell low;
Cell high;
#endif;
} cells;
DCell dcell;
} Double_Store;
typedef struct F83Name {
struct F83Name *next; /* the link field for old hands */
char countetc;
Char name[0];
} F83Name;
/* are macros for setting necessary? */
#define F83NAME_COUNT(np) ((np)->countetc & 0x1f)
#define F83NAME_SMUDGE(np) (((np)->countetc & 0x40) != 0)
#define F83NAME_IMMEDIATE(np) (((np)->countetc & 0x20) != 0)
/* NEXT and NEXT1 are split into several parts to help scheduling */
#ifdef DIRECT_THREADED
#define NEXT1_P1
#define NEXT1_P2 ({goto *cfa;})
#else
#define NEXT1_P1 ({ca = *cfa;})
#define NEXT1_P2 ({goto *ca;})
#endif
#define NEXT_P1 ({cfa = *ip++; NEXT1_P1;})
#define NEXT1 ({NEXT1_P1; NEXT1_P2;})
#define NEXT ({NEXT_P1; NEXT1_P2;})
#ifdef USE_TOS
#define IF_TOS(x) x
#else
#define IF_TOS(x)
#define TOS (sp[0])
#endif
#ifdef USE_FTOS
#define IF_FTOS(x) x
#else
#define IF_FTOS(x)
#define FTOS (fp[0])
#endif
#define DODOES (symbols[3])
int emitcounter;
#define NULLC '\0'
#define cstr(to, from, size)\
{ memcpy(to, from, size);\
to[size]=NULLC;}
#define NEWLINE '\n'
static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp)
/* executes code at ip, if ip!=NULL
returns array of machine code labels (for use in a loader), if ip==NULL
This is very preliminary, as the bootstrap architecture is not yet decided
*/
{
Xt cfa;
Address lp=NULL;
static Label symbols[]= {
&&docol,
&&docon,
&&dovar,
&&dodoes,
#include "prim_labels.i"
};
#ifndef DIRECT_THREADED
Label ca;
#endif
IF_TOS(register Cell TOS;)
IF_FTOS(Float FTOS;)
#ifdef CPU_DEP
CPU_DEP;
#endif
if (ip == NULL)
return symbols;
IF_TOS(TOS = sp[0]);
IF_FTOS(FTOS = fp[0]);
prep_terminal();
NEXT;
docol:
#ifdef DEBUG
printf("col: %x\n",(Cell)PFA1(cfa));
#endif
#ifdef undefined
/* this is the simple version */
*--rp = (Cell)ip;
ip = (Xt *)PFA1(cfa);
NEXT;
#endif
/* this one is important, so we help the compiler optimizing
The following version may be better (for scheduling), but probably has
problems with code fields employing calls and delay slots
*/
{
Xt *current_ip = (Xt *)PFA1(cfa);
cfa = *current_ip;
NEXT1_P1;
*--rp = (Cell)ip;
ip = current_ip+1;
}
NEXT1_P2;
docon:
#ifdef DEBUG
printf("con: %x\n",*(Cell*)PFA1(cfa));
#endif
#ifdef USE_TOS
*sp-- = TOS;
TOS = *(Cell *)PFA1(cfa);
#else
*--sp = *(Cell *)PFA1(cfa);
#endif
NEXT;
dovar:
#ifdef DEBUG
printf("var: %x\n",(Cell)PFA1(cfa));
#endif
#ifdef USE_TOS
*sp-- = TOS;
TOS = (Cell)PFA1(cfa);
#else
*--sp = (Cell)PFA1(cfa);
#endif
NEXT;
/* !! user? */
dodoes:
/* this assumes the following structure:
defining-word:
...
DOES>
(possible padding)
possibly handler: jmp dodoes
(possible branch delay slot(s))
Forth code after DOES>
defined word:
cfa: address of or jump to handler OR
address of or jump to dodoes, address of DOES-code
pfa:
*/
#ifdef DEBUG
printf("does: %x\n",(Cell)PFA(cfa));
#endif
*--rp = (Cell)ip;
/* PFA1 might collide with DOES_CODE1 here, so we use PFA */
#ifdef USE_TOS
*sp-- = TOS;
TOS = (Cell)PFA(cfa);
#else
*--sp = (Cell)PFA(cfa);
#endif
ip = DOES_CODE1(cfa);
NEXT;
#include "primitives.i"
}
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