/*
$Id: engine.c,v 1.15 1994/09/09 16:27:18 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 <time.h>
#include <sys/time.h>
#include "forth.h"
#include "io.h"
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,
unless CISC_NEXT is defined */
#ifdef CISC_NEXT
#define NEXT1_P1
#define NEXT_P1
#define DEF_CA
#ifdef DIRECT_THREADED
#define NEXT1_P2 ({goto *cfa;})
#else
#define NEXT1_P2 ({goto **cfa;})
#endif /* DIRECT_THREADED */
#define NEXT_P2 ({cfa = *ip++; NEXT1_P2;})
#else /* CISC_NEXT */
#ifdef DIRECT_THREADED
#define NEXT1_P1
#define NEXT1_P2 ({goto *cfa;})
#define DEF_CA
#else /* DIRECT_THREADED */
#define NEXT1_P1 ({ca = *cfa;})
#define NEXT1_P2 ({goto *ca;})
#define DEF_CA Label ca;
#endif /* DIRECT_THREADED */
#define NEXT_P1 ({cfa=*ip++; NEXT1_P1;})
#define NEXT_P2 NEXT1_P2
#endif /* CISC_NEXT */
#define NEXT1 ({DEF_CA NEXT1_P1; NEXT1_P2;})
#define NEXT ({DEF_CA NEXT_P1; NEXT_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
int emitcounter;
#define NULLC '\0'
char *cstr(Char *from, UCell size, int clear)
/* if clear is true, scratch can be reused, otherwise we want more of
the same */
{
static char *scratch=NULL;
static unsigned scratchsize=0;
static char *nextscratch;
char *oldnextscratch;
if (clear)
nextscratch=scratch;
if (scratch==NULL) {
scratch=malloc(size+1);
nextscratch=scratch;
scratchsize=size;
}
else if (nextscratch+size>scratch+scratchsize) {
char *oldscratch=scratch;
scratch = realloc(scratch, (nextscratch-scratch)+size+1);
nextscratch=scratch+(nextscratch-oldscratch);
scratchsize=size;
}
memcpy(nextscratch,from,size);
nextscratch[size]='\0';
oldnextscratch = nextscratch;
nextscratch += size+1;
return oldnextscratch;
}
#define NEWLINE '\n'
static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
static Address up0=NULL;
/* if machine.h has not defined explicit registers, define them as implicit */
#ifndef IPREG
#define IPREG
#endif
#ifndef SPREG
#define SPREG
#endif
#ifndef RPREG
#define RPREG
#endif
#ifndef FPREG
#define FPREG
#endif
#ifndef LPREG
#define LPREG
#endif
#ifndef CFAREG
#define CFAREG
#endif
#ifndef UPREG
#define UPREG
#endif
#ifndef TOSREG
#define TOSREG
#endif
#ifndef FTOSREG
#define FTOSREG
#endif
Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
/* executes code at ip, if ip!=NULL
returns array of machine code labels (for use in a loader), if ip==NULL
*/
{
register Xt *ip IPREG = ip0;
register Cell *sp SPREG = sp0;
register Cell *rp RPREG = rp0;
register Float *fp FPREG = fp0;
register Address lp LPREG = lp0;
register Xt cfa CFAREG;
register Address up UPREG = up0;
IF_TOS(register Cell TOS TOSREG;)
IF_FTOS(register Float FTOS FTOSREG;)
static Label symbols[]= {
&&docol,
&&docon,
&&dovar,
&&douser,
&&dodefer,
&&dodoes,
&&dodoes, /* dummy for does handler address */
#include "prim_labels.i"
};
#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("%08x: col: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
#endif
#ifdef CISC_NEXT
/* this is the simple version */
*--rp = (Cell)ip;
ip = (Xt *)PFA1(cfa);
NEXT;
#else
/* 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
*/
{
DEF_CA
Xt *current_ip = (Xt *)PFA1(cfa);
cfa = *current_ip;
NEXT1_P1;
*--rp = (Cell)ip;
ip = current_ip+1;
NEXT1_P2;
}
#endif
docon:
#ifdef DEBUG
printf("%08x: con: %08x\n",(Cell)ip,*(Cell*)PFA1(cfa));
#endif
#ifdef USE_TOS
*sp-- = TOS;
TOS = *(Cell *)PFA1(cfa);
#else
*--sp = *(Cell *)PFA1(cfa);
#endif
NEXT;
dovar:
#ifdef DEBUG
printf("%08x: var: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
#endif
#ifdef USE_TOS
*sp-- = TOS;
TOS = (Cell)PFA1(cfa);
#else
*--sp = (Cell)PFA1(cfa);
#endif
NEXT;
/* !! user? */
douser:
#ifdef DEBUG
printf("%08x: user: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
#endif
#ifdef USE_TOS
*sp-- = TOS;
TOS = (Cell)(up+*(Cell*)PFA1(cfa));
#else
*--sp = (Cell)(up+*(Cell*)PFA1(cfa));
#endif
NEXT;
dodefer:
#ifdef DEBUG
printf("%08x: defer: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
#endif
cfa = *(Xt *)PFA1(cfa);
NEXT1;
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("%08x/%08x: does: %08x\n",(Cell)ip,(Cell)cfa,*(Cell)PFA(cfa));
fflush(stdout);
#endif
*--rp = (Cell)ip;
/* PFA1 might collide with DOES_CODE1 here, so we use PFA */
ip = DOES_CODE1(cfa);
#ifdef USE_TOS
*sp-- = TOS;
TOS = (Cell)PFA(cfa);
#else
*--sp = (Cell)PFA(cfa);
#endif
NEXT;
#include "primitives.i"
}
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