File:  [gforth] / gforth / engine / engine.c
Revision 1.17: download - view: text, annotated - select for diffs
Wed May 31 14:37:41 2000 UTC (19 years, 10 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Added directory reads:
open-dir, read-dir, close-dir, filename-match

    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: #include <dirent.h>
   42: #else
   43: #include "systypes.h"
   44: #endif
   45: 
   46: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   47: #include <dlfcn.h>
   48: #endif
   49: #if defined(_WIN32)
   50: #include <windows.h>
   51: #endif
   52: #ifdef hpux
   53: #include <dl.h>
   54: #endif
   55: 
   56: #ifndef SEEK_SET
   57: /* should be defined in stdio.h, but some systems don't have it */
   58: #define SEEK_SET 0
   59: #endif
   60: 
   61: #define IOR(flag)	((flag)? -512-errno : 0)
   62: 
   63: struct F83Name {
   64:   struct F83Name *next;  /* the link field for old hands */
   65:   char		countetc;
   66:   char		name[0];
   67: };
   68: 
   69: /* are macros for setting necessary? */
   70: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   71: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   72: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   73: 
   74: Cell *SP;
   75: Float *FP;
   76: Address UP=NULL;
   77: 
   78: #if 0
   79: /* not used currently */
   80: int emitcounter;
   81: #endif
   82: #define NULLC '\0'
   83: 
   84: #ifdef MEMCMP_AS_SUBROUTINE
   85: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
   86: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
   87: #endif
   88: 
   89: #ifdef HAS_FILE
   90: char *cstr(Char *from, UCell size, int clear)
   91: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   92:    the C-string lives until the next call of cstr with CLEAR being true */
   93: {
   94:   static struct cstr_buffer {
   95:     char *buffer;
   96:     size_t size;
   97:   } *buffers=NULL;
   98:   static int nbuffers=0;
   99:   static int used=0;
  100:   struct cstr_buffer *b;
  101: 
  102:   if (buffers==NULL)
  103:     buffers=malloc(0);
  104:   if (clear)
  105:     used=0;
  106:   if (used>=nbuffers) {
  107:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
  108:     buffers[used]=(struct cstr_buffer){malloc(0),0};
  109:     nbuffers=used+1;
  110:   }
  111:   b=&buffers[used];
  112:   if (size+1 > b->size) {
  113:     b->buffer = realloc(b->buffer,size+1);
  114:     b->size = size+1;
  115:   }
  116:   memcpy(b->buffer,from,size);
  117:   b->buffer[size]='\0';
  118:   used++;
  119:   return b->buffer;
  120: }
  121: 
  122: char *tilde_cstr(Char *from, UCell size, int clear)
  123: /* like cstr(), but perform tilde expansion on the string */
  124: {
  125:   char *s1,*s2;
  126:   int s1_len, s2_len;
  127:   struct passwd *getpwnam (), *user_entry;
  128: 
  129:   if (size<1 || from[0]!='~')
  130:     return cstr(from, size, clear);
  131:   if (size<2 || from[1]=='/') {
  132:     s1 = (char *)getenv ("HOME");
  133:     if(s1 == NULL)
  134:       s1 = "";
  135:     s2 = from+1;
  136:     s2_len = size-1;
  137:   } else {
  138:     UCell i;
  139:     for (i=1; i<size && from[i]!='/'; i++)
  140:       ;
  141:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
  142:       return cstr(from+3, size<3?0:size-3,clear);
  143:     {
  144:       char user[i];
  145:       memcpy(user,from+1,i-1);
  146:       user[i-1]='\0';
  147:       user_entry=getpwnam(user);
  148:     }
  149:     if (user_entry==NULL)
  150:       return cstr(from, size, clear);
  151:     s1 = user_entry->pw_dir;
  152:     s2 = from+i;
  153:     s2_len = size-i;
  154:   }
  155:   s1_len = strlen(s1);
  156:   if (s1_len>1 && s1[s1_len-1]=='/')
  157:     s1_len--;
  158:   {
  159:     char path[s1_len+s2_len];
  160:     memcpy(path,s1,s1_len);
  161:     memcpy(path+s1_len,s2,s2_len);
  162:     return cstr(path,s1_len+s2_len,clear);
  163:   }
  164: }
  165: #endif
  166: 
  167: #define NEWLINE	'\n'
  168: 
  169: #ifndef HAVE_RINT
  170: #define rint(x)	floor((x)+0.5)
  171: #endif
  172: 
  173: #ifdef HAS_FILE
  174: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
  175: 
  176: #ifndef O_BINARY
  177: #define O_BINARY 0
  178: #endif
  179: #ifndef O_TEXT
  180: #define O_TEXT 0
  181: #endif
  182: 
  183: static int ufileattr[6]= {
  184:   O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
  185:   O_RDWR  |O_BINARY, O_RDWR  |O_BINARY,
  186:   O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
  187: #endif
  188: 
  189: /* if machine.h has not defined explicit registers, define them as implicit */
  190: #ifndef IPREG
  191: #define IPREG
  192: #endif
  193: #ifndef SPREG
  194: #define SPREG
  195: #endif
  196: #ifndef RPREG
  197: #define RPREG
  198: #endif
  199: #ifndef FPREG
  200: #define FPREG
  201: #endif
  202: #ifndef LPREG
  203: #define LPREG
  204: #endif
  205: #ifndef CFAREG
  206: #define CFAREG
  207: #endif
  208: #ifndef UPREG
  209: #define UPREG
  210: #endif
  211: #ifndef TOSREG
  212: #define TOSREG
  213: #endif
  214: #ifndef FTOSREG
  215: #define FTOSREG
  216: #endif
  217: 
  218: #ifndef CPU_DEP1
  219: # define CPU_DEP1 0
  220: #endif
  221: 
  222: /* declare and compute cfa for certain threading variants */
  223: /* warning: this is nonsyntactical; it will not work in place of a statement */
  224: #ifndef GETCFA
  225: #define DOCFA
  226: #else
  227: #define DOCFA	Xt cfa; GETCFA(cfa)
  228: #endif
  229: 
  230: #ifdef GFORTH_DEBUGGING
  231: /* define some VM registers as global variables, so they survive exceptions;
  232:    global register variables are not up to the task (according to the 
  233:    GNU C manual) */
  234: Xt *ip;
  235: Cell *rp;
  236: #endif
  237: 
  238: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  239: /* executes code at ip, if ip!=NULL
  240:    returns array of machine code labels (for use in a loader), if ip==NULL
  241: */
  242: {
  243: #ifndef GFORTH_DEBUGGING
  244:   register Xt *ip IPREG;
  245:   register Cell *rp RPREG;
  246: #endif
  247:   register Cell *sp SPREG = sp0;
  248:   register Float *fp FPREG = fp0;
  249:   register Address lp LPREG = lp0;
  250: #ifdef CFA_NEXT
  251:   register Xt cfa CFAREG;
  252: #endif
  253: #ifdef MORE_VARS
  254:   MORE_VARS
  255: #endif
  256:   register Address up UPREG = UP;
  257:   IF_TOS(register Cell TOS TOSREG;)
  258:   IF_FTOS(register Float FTOS FTOSREG;)
  259: #if defined(DOUBLY_INDIRECT)
  260:   static Label *symbols;
  261:   static void *routines[]= {
  262: #else /* !defined(DOUBLY_INDIRECT) */
  263:   static Label symbols[]= {
  264: #endif /* !defined(DOUBLY_INDIRECT) */
  265:     (Label)&&docol,
  266:     (Label)&&docon,
  267:     (Label)&&dovar,
  268:     (Label)&&douser,
  269:     (Label)&&dodefer,
  270:     (Label)&&dofield,
  271:     (Label)&&dodoes,
  272:     /* the following entry is normally unused;
  273:        it's there because its index indicates a does-handler */
  274:     CPU_DEP1,
  275: #include "prim_lab.i"
  276:     (Label)0
  277:   };
  278: #ifdef CPU_DEP2
  279:   CPU_DEP2
  280: #endif
  281: 
  282:   ip = ip0;
  283:   rp = rp0;
  284: #ifdef DEBUG
  285:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  286:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  287: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  288: #endif
  289: 
  290:   if (ip == NULL) {
  291: #if defined(DOUBLY_INDIRECT)
  292: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  293: #define CODE_OFFSET (22*sizeof(Cell))
  294:     int i;
  295:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  296: 
  297:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  298:     for (i=0; i<DOESJUMP+1; i++)
  299:       symbols[i] = (Label)routines[i];
  300:     for (; routines[i]!=0; i++) {
  301:       if (i>=MAX_SYMBOLS) {
  302: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  303: 	exit(1);
  304:     }
  305:     symbols[i] = &routines[i];
  306:   }
  307: #endif /* defined(DOUBLY_INDIRECT) */
  308:   return symbols;
  309: }
  310: 
  311:   IF_TOS(TOS = sp[0]);
  312:   IF_FTOS(FTOS = fp[0]);
  313: /*  prep_terminal(); */
  314:   SET_IP(ip);
  315:   NEXT;
  316: 
  317: 
  318: #ifdef CPU_DEP3
  319:   CPU_DEP3
  320: #endif
  321:   
  322:  docol:
  323:   {
  324:     DOCFA;
  325: #ifdef DEBUG
  326:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  327: #endif
  328: #ifdef CISC_NEXT
  329:     /* this is the simple version */
  330:     *--rp = (Cell)ip;
  331:     SET_IP((Xt *)PFA1(cfa));
  332:     NEXT;
  333: #else
  334:     /* this one is important, so we help the compiler optimizing */
  335:     {
  336:       DEF_CA
  337:       rp[-1] = (Cell)ip;
  338:       SET_IP((Xt *)PFA1(cfa));
  339:       NEXT_P1;
  340:       rp--;
  341:       NEXT_P2;
  342:     }
  343: #endif
  344:   }
  345: 
  346:  docon:
  347:   {
  348:     DOCFA;
  349: #ifdef DEBUG
  350:     fprintf(stderr,"%08lx: con: %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:  dovar:
  363:   {
  364:     DOCFA;
  365: #ifdef DEBUG
  366:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  367: #endif
  368: #ifdef USE_TOS
  369:     *sp-- = TOS;
  370:     TOS = (Cell)PFA1(cfa);
  371: #else
  372:     *--sp = (Cell)PFA1(cfa);
  373: #endif
  374:   }
  375:   NEXT_P0;
  376:   NEXT;
  377:   
  378:  douser:
  379:   {
  380:     DOCFA;
  381: #ifdef DEBUG
  382:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  383: #endif
  384: #ifdef USE_TOS
  385:     *sp-- = TOS;
  386:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  387: #else
  388:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  389: #endif
  390:   }
  391:   NEXT_P0;
  392:   NEXT;
  393:   
  394:  dodefer:
  395:   {
  396:     DOCFA;
  397: #ifdef DEBUG
  398:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  399: #endif
  400:     EXEC(*(Xt *)PFA1(cfa));
  401:   }
  402: 
  403:  dofield:
  404:   {
  405:     DOCFA;
  406: #ifdef DEBUG
  407:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  408: #endif
  409:     TOS += *(Cell*)PFA1(cfa);
  410:   }
  411:   NEXT_P0;
  412:   NEXT;
  413: 
  414:  dodoes:
  415:   /* this assumes the following structure:
  416:      defining-word:
  417:      
  418:      ...
  419:      DOES>
  420:      (possible padding)
  421:      possibly handler: jmp dodoes
  422:      (possible branch delay slot(s))
  423:      Forth code after DOES>
  424:      
  425:      defined word:
  426:      
  427:      cfa: address of or jump to handler OR
  428:           address of or jump to dodoes, address of DOES-code
  429:      pfa:
  430:      
  431:      */
  432:   {
  433:     DOCFA;
  434: 
  435:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  436: #ifdef DEBUG
  437:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  438:     fflush(stderr);
  439: #endif
  440:     *--rp = (Cell)ip;
  441:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  442: #ifdef USE_TOS
  443:     *sp-- = TOS;
  444:     TOS = (Cell)PFA(cfa);
  445: #else
  446:     *--sp = (Cell)PFA(cfa);
  447: #endif
  448:     SET_IP(DOES_CODE1(cfa));
  449:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  450:   }
  451:   NEXT;
  452: 
  453: #include "prim.i"
  454: }

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