File:  [gforth] / gforth / engine / engine.c
Revision 1.8: download - view: text, annotated - select for diffs
Sat Dec 12 22:32:05 1998 UTC (21 years, 10 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Fixed Makefile for DOS (doesn't fully work yet)
Fixed shared library for Windows (not tested yet)

    1: /* Gforth virtual machine (aka inner interpreter)
    2: 
    3:   Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation; either version 2
   10:   of the License, or (at your option) any later version.
   11: 
   12:   This program is distributed in the hope that it will be useful,
   13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:   GNU General Public License for more details.
   16: 
   17:   You should have received a copy of the GNU General Public License
   18:   along with this program; if not, write to the Free Software
   19:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: */
   21: 
   22: #include "config.h"
   23: #include <ctype.h>
   24: #include <stdio.h>
   25: #include <string.h>
   26: #include <math.h>
   27: #include <assert.h>
   28: #include <stdlib.h>
   29: #include <errno.h>
   30: #include "forth.h"
   31: #include "io.h"
   32: #include "threaded.h"
   33: #ifndef STANDALONE
   34: #include <sys/types.h>
   35: #include <sys/stat.h>
   36: #include <fcntl.h>
   37: #include <time.h>
   38: #include <sys/time.h>
   39: #include <unistd.h>
   40: #include <pwd.h>
   41: #else
   42: #include "systypes.h"
   43: #endif
   44: 
   45: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   46: #include <dlfcn.h>
   47: #endif
   48: #if defined(_WIN32)
   49: #include <windows.h>
   50: #endif
   51: #ifdef hpux
   52: #include <dl.h>
   53: #endif
   54: 
   55: #ifndef SEEK_SET
   56: /* should be defined in stdio.h, but some systems don't have it */
   57: #define SEEK_SET 0
   58: #endif
   59: 
   60: #define IOR(flag)	((flag)? -512-errno : 0)
   61: 
   62: struct F83Name {
   63:   struct F83Name *next;  /* the link field for old hands */
   64:   char		countetc;
   65:   char		name[0];
   66: };
   67: 
   68: /* are macros for setting necessary? */
   69: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   70: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   71: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   72: 
   73: Cell *SP;
   74: Float *FP;
   75: Address UP=NULL;
   76: 
   77: #if 0
   78: /* not used currently */
   79: int emitcounter;
   80: #endif
   81: #define NULLC '\0'
   82: 
   83: char *cstr(Char *from, UCell size, int clear)
   84: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   85:    the C-string lives until the next call of cstr with CLEAR being true */
   86: {
   87:   static struct cstr_buffer {
   88:     char *buffer;
   89:     size_t size;
   90:   } *buffers=NULL;
   91:   static int nbuffers=0;
   92:   static int used=0;
   93:   struct cstr_buffer *b;
   94: 
   95:   if (buffers==NULL)
   96:     buffers=malloc(0);
   97:   if (clear)
   98:     used=0;
   99:   if (used>=nbuffers) {
  100:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
  101:     buffers[used]=(struct cstr_buffer){malloc(0),0};
  102:     nbuffers=used+1;
  103:   }
  104:   b=&buffers[used];
  105:   if (size+1 > b->size) {
  106:     b->buffer = realloc(b->buffer,size+1);
  107:     b->size = size+1;
  108:   }
  109:   memcpy(b->buffer,from,size);
  110:   b->buffer[size]='\0';
  111:   used++;
  112:   return b->buffer;
  113: }
  114: 
  115: #ifdef STANDALONE
  116: char *tilde_cstr(Char *from, UCell size, int clear)
  117: {
  118:   return cstr(from, size, clear);
  119: }
  120: #else
  121: char *tilde_cstr(Char *from, UCell size, int clear)
  122: /* like cstr(), but perform tilde expansion on the string */
  123: {
  124:   char *s1,*s2;
  125:   int s1_len, s2_len;
  126:   struct passwd *getpwnam (), *user_entry;
  127: 
  128:   if (size<1 || from[0]!='~')
  129:     return cstr(from, size, clear);
  130:   if (size<2 || from[1]=='/') {
  131:     s1 = (char *)getenv ("HOME");
  132:     if(s1 == NULL)
  133:       s1 = "";
  134:     s2 = from+1;
  135:     s2_len = size-1;
  136:   } else {
  137:     UCell i;
  138:     for (i=1; i<size && from[i]!='/'; i++)
  139:       ;
  140:     {
  141:       char user[i];
  142:       memcpy(user,from+1,i-1);
  143:       user[i-1]='\0';
  144:       user_entry=getpwnam(user);
  145:     }
  146:     if (user_entry==NULL)
  147:       return cstr(from, size, clear);
  148:     s1 = user_entry->pw_dir;
  149:     s2 = from+i;
  150:     s2_len = size-i;
  151:   }
  152:   s1_len = strlen(s1);
  153:   if (s1_len>1 && s1[s1_len-1]=='/')
  154:     s1_len--;
  155:   {
  156:     char path[s1_len+s2_len];
  157:     memcpy(path,s1,s1_len);
  158:     memcpy(path+s1_len,s2,s2_len);
  159:     return cstr(path,s1_len+s2_len,clear);
  160:   }
  161: }
  162: #endif   
  163: 
  164: #define NEWLINE	'\n'
  165: 
  166: #ifndef HAVE_RINT
  167: #define rint(x)	floor((x)+0.5)
  168: #endif
  169: 
  170: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
  171: 
  172: #ifndef O_BINARY
  173: #define O_BINARY 0
  174: #endif
  175: #ifndef O_TEXT
  176: #define O_TEXT 0
  177: #endif
  178: 
  179: static int ufileattr[6]= {
  180:   O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
  181:   O_RDWR  |O_TEXT, O_RDWR  |O_BINARY,
  182:   O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
  183: 
  184: /* if machine.h has not defined explicit registers, define them as implicit */
  185: #ifndef IPREG
  186: #define IPREG
  187: #endif
  188: #ifndef SPREG
  189: #define SPREG
  190: #endif
  191: #ifndef RPREG
  192: #define RPREG
  193: #endif
  194: #ifndef FPREG
  195: #define FPREG
  196: #endif
  197: #ifndef LPREG
  198: #define LPREG
  199: #endif
  200: #ifndef CFAREG
  201: #define CFAREG
  202: #endif
  203: #ifndef UPREG
  204: #define UPREG
  205: #endif
  206: #ifndef TOSREG
  207: #define TOSREG
  208: #endif
  209: #ifndef FTOSREG
  210: #define FTOSREG
  211: #endif
  212: 
  213: #ifndef CPU_DEP1
  214: # define CPU_DEP1 0
  215: #endif
  216: 
  217: /* declare and compute cfa for certain threading variants */
  218: /* warning: this is nonsyntactical; it will not work in place of a statement */
  219: #ifdef CFA_NEXT
  220: #define DOCFA
  221: #else
  222: #define DOCFA	Xt cfa; GETCFA(cfa)
  223: #endif
  224: 
  225: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  226: /* executes code at ip, if ip!=NULL
  227:    returns array of machine code labels (for use in a loader), if ip==NULL
  228: */
  229: {
  230:   register Xt *ip IPREG = ip0;
  231:   register Cell *sp SPREG = sp0;
  232:   register Cell *rp RPREG = rp0;
  233:   register Float *fp FPREG = fp0;
  234:   register Address lp LPREG = lp0;
  235: #ifdef CFA_NEXT
  236:   register Xt cfa CFAREG;
  237: #endif
  238:   register Address up UPREG = UP;
  239:   IF_TOS(register Cell TOS TOSREG;)
  240:   IF_FTOS(register Float FTOS FTOSREG;)
  241: #if defined(DOUBLY_INDIRECT)
  242:   static Label *symbols;
  243:   static void *routines[]= {
  244: #else /* !defined(DOUBLY_INDIRECT) */
  245:   static Label symbols[]= {
  246: #endif /* !defined(DOUBLY_INDIRECT) */
  247:     (Label)&&docol,
  248:     (Label)&&docon,
  249:     (Label)&&dovar,
  250:     (Label)&&douser,
  251:     (Label)&&dodefer,
  252:     (Label)&&dofield,
  253:     (Label)&&dodoes,
  254:     /* the following entry is normally unused;
  255:        it's there because its index indicates a does-handler */
  256:     CPU_DEP1,
  257: #include "prim_lab.i"
  258:     (Label)0
  259:   };
  260: #ifdef CPU_DEP2
  261:   CPU_DEP2
  262: #endif
  263: 
  264: #ifdef DEBUG
  265:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  266:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  267: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  268: #endif
  269: 
  270:   if (ip == NULL) {
  271: #if defined(DOUBLY_INDIRECT)
  272: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  273: #define CODE_OFFSET (22*sizeof(Cell))
  274:     int i;
  275:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  276: 
  277:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  278:     for (i=0; i<DOESJUMP+1; i++)
  279:       symbols[i] = (Label)routines[i];
  280:     for (; routines[i]!=0; i++) {
  281:       if (i>=MAX_SYMBOLS) {
  282: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  283: 	exit(1);
  284:     }
  285:     symbols[i] = &routines[i];
  286:   }
  287: #endif /* defined(DOUBLY_INDIRECT) */
  288:   return symbols;
  289: }
  290: 
  291:   IF_TOS(TOS = sp[0]);
  292:   IF_FTOS(FTOS = fp[0]);
  293: /*  prep_terminal(); */
  294:   NEXT_P0;
  295:   NEXT;
  296: 
  297: #ifdef CPU_DEP3
  298:   CPU_DEP3
  299: #endif
  300:   
  301:  docol:
  302:   {
  303:     DOCFA;
  304: #ifdef DEBUG
  305:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  306: #endif
  307: #ifdef CISC_NEXT
  308:     /* this is the simple version */
  309:     *--rp = (Cell)ip;
  310:     ip = (Xt *)PFA1(cfa);
  311:     NEXT_P0;
  312:     NEXT;
  313: #else
  314:     /* this one is important, so we help the compiler optimizing
  315:        The following version may be better (for scheduling), but probably has
  316:        problems with code fields employing calls and delay slots
  317:        */
  318:     {
  319:       DEF_CA
  320:       Xt *current_ip = (Xt *)PFA1(cfa);
  321:       cfa = *current_ip;
  322:       NEXT1_P1;
  323:       *--rp = (Cell)ip;
  324:       ip = current_ip+1;
  325:       NEXT1_P2;
  326:     }
  327: #endif
  328:   }
  329: 
  330:  docon:
  331:   {
  332:     DOCFA;
  333: #ifdef DEBUG
  334:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  335: #endif
  336: #ifdef USE_TOS
  337:     *sp-- = TOS;
  338:     TOS = *(Cell *)PFA1(cfa);
  339: #else
  340:     *--sp = *(Cell *)PFA1(cfa);
  341: #endif
  342:   }
  343:   NEXT_P0;
  344:   NEXT;
  345:   
  346:  dovar:
  347:   {
  348:     DOCFA;
  349: #ifdef DEBUG
  350:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  351: #endif
  352: #ifdef USE_TOS
  353:     *sp-- = TOS;
  354:     TOS = (Cell)PFA1(cfa);
  355: #else
  356:     *--sp = (Cell)PFA1(cfa);
  357: #endif
  358:   }
  359:   NEXT_P0;
  360:   NEXT;
  361:   
  362:  douser:
  363:   {
  364:     DOCFA;
  365: #ifdef DEBUG
  366:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  367: #endif
  368: #ifdef USE_TOS
  369:     *sp-- = TOS;
  370:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  371: #else
  372:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  373: #endif
  374:   }
  375:   NEXT_P0;
  376:   NEXT;
  377:   
  378:  dodefer:
  379:   {
  380:     DOCFA;
  381: #ifdef DEBUG
  382:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  383: #endif
  384:     EXEC(*(Xt *)PFA1(cfa));
  385:   }
  386: 
  387:  dofield:
  388:   {
  389:     DOCFA;
  390: #ifdef DEBUG
  391:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  392: #endif
  393:     TOS += *(Cell*)PFA1(cfa); 
  394:   }
  395:   NEXT_P0;
  396:   NEXT;
  397: 
  398:  dodoes:
  399:   /* this assumes the following structure:
  400:      defining-word:
  401:      
  402:      ...
  403:      DOES>
  404:      (possible padding)
  405:      possibly handler: jmp dodoes
  406:      (possible branch delay slot(s))
  407:      Forth code after DOES>
  408:      
  409:      defined word:
  410:      
  411:      cfa: address of or jump to handler OR
  412:           address of or jump to dodoes, address of DOES-code
  413:      pfa:
  414:      
  415:      */
  416:   {
  417:     DOCFA;
  418: 
  419:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  420: #ifdef DEBUG
  421:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  422:     fflush(stderr);
  423: #endif
  424:     *--rp = (Cell)ip;
  425:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  426:     ip = DOES_CODE1(cfa);
  427: #ifdef USE_TOS
  428:     *sp-- = TOS;
  429:     TOS = (Cell)PFA(cfa);
  430: #else
  431:     *--sp = (Cell)PFA(cfa);
  432: #endif
  433:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  434:   }
  435:   NEXT_P0;
  436:   NEXT;
  437: 
  438: #include "prim.i"
  439: }

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