File:  [gforth] / gforth / engine / engine.c
Revision 1.23: download - view: text, annotated - select for diffs
Sat Sep 23 15:47:07 2000 UTC (19 years, 8 months ago) by anton
Branches: MAIN
CVS tags: v0-5-0, HEAD
changed FSF address in copyright messages

    1: /* Gforth virtual machine (aka inner interpreter)
    2: 
    3:   Copyright (C) 1995,1996,1997,1998,2000 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., 59 Temple Place, Suite 330, Boston, MA 02111, 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: #include <sys/resource.h>
   43: #ifdef HAVE_FNMATCH_H
   44: #include <fnmatch.h>
   45: #else
   46: #include "fnmatch.h"
   47: #endif
   48: #else
   49: #include "systypes.h"
   50: #endif
   51: 
   52: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   53: #include <dlfcn.h>
   54: #endif
   55: #if defined(_WIN32)
   56: #include <windows.h>
   57: #endif
   58: #ifdef hpux
   59: #include <dl.h>
   60: #endif
   61: 
   62: #ifndef SEEK_SET
   63: /* should be defined in stdio.h, but some systems don't have it */
   64: #define SEEK_SET 0
   65: #endif
   66: 
   67: #define IOR(flag)	((flag)? -512-errno : 0)
   68: 
   69: struct F83Name {
   70:   struct F83Name *next;  /* the link field for old hands */
   71:   char		countetc;
   72:   char		name[0];
   73: };
   74: 
   75: /* are macros for setting necessary? */
   76: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   77: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   78: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   79: 
   80: Cell *SP;
   81: Float *FP;
   82: Address UP=NULL;
   83: 
   84: #if 0
   85: /* not used currently */
   86: int emitcounter;
   87: #endif
   88: #define NULLC '\0'
   89: 
   90: #ifdef MEMCMP_AS_SUBROUTINE
   91: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
   92: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
   93: #endif
   94: 
   95: #ifdef HAS_FILE
   96: char *cstr(Char *from, UCell size, int clear)
   97: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   98:    the C-string lives until the next call of cstr with CLEAR being true */
   99: {
  100:   static struct cstr_buffer {
  101:     char *buffer;
  102:     size_t size;
  103:   } *buffers=NULL;
  104:   static int nbuffers=0;
  105:   static int used=0;
  106:   struct cstr_buffer *b;
  107: 
  108:   if (buffers==NULL)
  109:     buffers=malloc(0);
  110:   if (clear)
  111:     used=0;
  112:   if (used>=nbuffers) {
  113:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
  114:     buffers[used]=(struct cstr_buffer){malloc(0),0};
  115:     nbuffers=used+1;
  116:   }
  117:   b=&buffers[used];
  118:   if (size+1 > b->size) {
  119:     b->buffer = realloc(b->buffer,size+1);
  120:     b->size = size+1;
  121:   }
  122:   memcpy(b->buffer,from,size);
  123:   b->buffer[size]='\0';
  124:   used++;
  125:   return b->buffer;
  126: }
  127: 
  128: char *tilde_cstr(Char *from, UCell size, int clear)
  129: /* like cstr(), but perform tilde expansion on the string */
  130: {
  131:   char *s1,*s2;
  132:   int s1_len, s2_len;
  133:   struct passwd *getpwnam (), *user_entry;
  134: 
  135:   if (size<1 || from[0]!='~')
  136:     return cstr(from, size, clear);
  137:   if (size<2 || from[1]=='/') {
  138:     s1 = (char *)getenv ("HOME");
  139:     if(s1 == NULL)
  140:       s1 = "";
  141:     s2 = from+1;
  142:     s2_len = size-1;
  143:   } else {
  144:     UCell i;
  145:     for (i=1; i<size && from[i]!='/'; i++)
  146:       ;
  147:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
  148:       return cstr(from+3, size<3?0:size-3,clear);
  149:     {
  150:       char user[i];
  151:       memcpy(user,from+1,i-1);
  152:       user[i-1]='\0';
  153:       user_entry=getpwnam(user);
  154:     }
  155:     if (user_entry==NULL)
  156:       return cstr(from, size, clear);
  157:     s1 = user_entry->pw_dir;
  158:     s2 = from+i;
  159:     s2_len = size-i;
  160:   }
  161:   s1_len = strlen(s1);
  162:   if (s1_len>1 && s1[s1_len-1]=='/')
  163:     s1_len--;
  164:   {
  165:     char path[s1_len+s2_len];
  166:     memcpy(path,s1,s1_len);
  167:     memcpy(path+s1_len,s2,s2_len);
  168:     return cstr(path,s1_len+s2_len,clear);
  169:   }
  170: }
  171: #endif
  172: 
  173: DCell timeval2us(struct timeval *tvp)
  174: {
  175: #ifndef BUGGY_LONG_LONG
  176:   return (tvp->tv_sec*(DCell)1000000)+tvp->tv_usec;
  177: #else
  178:   DCell d2;
  179:   DCell d1=mmul(tvp->tv_sec,1000000);
  180:   d2.lo = d1.lo+tvp->tv_usec;
  181:   d2.hi = d1.hi + (d2.lo<d1.lo);
  182:   return d2;
  183: #endif
  184: }
  185: 
  186: #define NEWLINE	'\n'
  187: 
  188: #ifndef HAVE_RINT
  189: #define rint(x)	floor((x)+0.5)
  190: #endif
  191: 
  192: #ifdef HAS_FILE
  193: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
  194: 
  195: #ifndef O_BINARY
  196: #define O_BINARY 0
  197: #endif
  198: #ifndef O_TEXT
  199: #define O_TEXT 0
  200: #endif
  201: 
  202: static int ufileattr[6]= {
  203:   O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
  204:   O_RDWR  |O_BINARY, O_RDWR  |O_BINARY,
  205:   O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
  206: #endif
  207: 
  208: /* if machine.h has not defined explicit registers, define them as implicit */
  209: #ifndef IPREG
  210: #define IPREG
  211: #endif
  212: #ifndef SPREG
  213: #define SPREG
  214: #endif
  215: #ifndef RPREG
  216: #define RPREG
  217: #endif
  218: #ifndef FPREG
  219: #define FPREG
  220: #endif
  221: #ifndef LPREG
  222: #define LPREG
  223: #endif
  224: #ifndef CFAREG
  225: #define CFAREG
  226: #endif
  227: #ifndef UPREG
  228: #define UPREG
  229: #endif
  230: #ifndef TOSREG
  231: #define TOSREG
  232: #endif
  233: #ifndef FTOSREG
  234: #define FTOSREG
  235: #endif
  236: 
  237: #ifndef CPU_DEP1
  238: # define CPU_DEP1 0
  239: #endif
  240: 
  241: /* declare and compute cfa for certain threading variants */
  242: /* warning: this is nonsyntactical; it will not work in place of a statement */
  243: #ifndef GETCFA
  244: #define DOCFA
  245: #else
  246: #define DOCFA	Xt cfa; GETCFA(cfa)
  247: #endif
  248: 
  249: #ifdef GFORTH_DEBUGGING
  250: /* define some VM registers as global variables, so they survive exceptions;
  251:    global register variables are not up to the task (according to the 
  252:    GNU C manual) */
  253: Xt *ip;
  254: Cell *rp;
  255: #endif
  256: 
  257: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  258: /* executes code at ip, if ip!=NULL
  259:    returns array of machine code labels (for use in a loader), if ip==NULL
  260: */
  261: {
  262: #ifndef GFORTH_DEBUGGING
  263:   register Xt *ip IPREG;
  264:   register Cell *rp RPREG;
  265: #endif
  266:   register Cell *sp SPREG = sp0;
  267:   register Float *fp FPREG = fp0;
  268:   register Address lp LPREG = lp0;
  269: #ifdef CFA_NEXT
  270:   register Xt cfa CFAREG;
  271: #endif
  272: #ifdef MORE_VARS
  273:   MORE_VARS
  274: #endif
  275:   register Address up UPREG = UP;
  276:   IF_TOS(register Cell TOS TOSREG;)
  277:   IF_FTOS(register Float FTOS FTOSREG;)
  278: #if defined(DOUBLY_INDIRECT)
  279:   static Label *symbols;
  280:   static void *routines[]= {
  281: #else /* !defined(DOUBLY_INDIRECT) */
  282:   static Label symbols[]= {
  283: #endif /* !defined(DOUBLY_INDIRECT) */
  284:     (Label)&&docol,
  285:     (Label)&&docon,
  286:     (Label)&&dovar,
  287:     (Label)&&douser,
  288:     (Label)&&dodefer,
  289:     (Label)&&dofield,
  290:     (Label)&&dodoes,
  291:     /* the following entry is normally unused;
  292:        it's there because its index indicates a does-handler */
  293:     CPU_DEP1,
  294: #include "prim_lab.i"
  295:     (Label)0
  296:   };
  297: #ifdef CPU_DEP2
  298:   CPU_DEP2
  299: #endif
  300: 
  301:   ip = ip0;
  302:   rp = rp0;
  303: #ifdef DEBUG
  304:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  305:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  306: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  307: #endif
  308: 
  309:   if (ip == NULL) {
  310: #if defined(DOUBLY_INDIRECT)
  311: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  312: #define CODE_OFFSET (22*sizeof(Cell))
  313:     int i;
  314:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  315: 
  316:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  317:     for (i=0; i<DOESJUMP+1; i++)
  318:       symbols[i] = (Label)routines[i];
  319:     for (; routines[i]!=0; i++) {
  320:       if (i>=MAX_SYMBOLS) {
  321: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  322: 	exit(1);
  323:       }
  324:       symbols[i] = &routines[i];
  325:     }
  326: #endif /* defined(DOUBLY_INDIRECT) */
  327:     return symbols;
  328:   }
  329: 
  330:   IF_TOS(TOS = sp[0]);
  331:   IF_FTOS(FTOS = fp[0]);
  332: /*  prep_terminal(); */
  333:   SET_IP(ip);
  334:   NEXT;
  335: 
  336: 
  337: #ifdef CPU_DEP3
  338:   CPU_DEP3
  339: #endif
  340:   
  341:  docol:
  342:   {
  343:     DOCFA;
  344: #ifdef DEBUG
  345:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  346: #endif
  347: #ifdef CISC_NEXT
  348:     /* this is the simple version */
  349:     *--rp = (Cell)ip;
  350:     SET_IP((Xt *)PFA1(cfa));
  351:     NEXT;
  352: #else
  353:     /* this one is important, so we help the compiler optimizing */
  354:     {
  355:       DEF_CA
  356:       rp[-1] = (Cell)ip;
  357:       SET_IP((Xt *)PFA1(cfa));
  358:       NEXT_P1;
  359:       rp--;
  360:       NEXT_P2;
  361:     }
  362: #endif
  363:   }
  364: 
  365:  docon:
  366:   {
  367:     DOCFA;
  368: #ifdef DEBUG
  369:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  370: #endif
  371: #ifdef USE_TOS
  372:     *sp-- = TOS;
  373:     TOS = *(Cell *)PFA1(cfa);
  374: #else
  375:     *--sp = *(Cell *)PFA1(cfa);
  376: #endif
  377:   }
  378:   NEXT_P0;
  379:   NEXT;
  380:   
  381:  dovar:
  382:   {
  383:     DOCFA;
  384: #ifdef DEBUG
  385:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  386: #endif
  387: #ifdef USE_TOS
  388:     *sp-- = TOS;
  389:     TOS = (Cell)PFA1(cfa);
  390: #else
  391:     *--sp = (Cell)PFA1(cfa);
  392: #endif
  393:   }
  394:   NEXT_P0;
  395:   NEXT;
  396:   
  397:  douser:
  398:   {
  399:     DOCFA;
  400: #ifdef DEBUG
  401:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  402: #endif
  403: #ifdef USE_TOS
  404:     *sp-- = TOS;
  405:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  406: #else
  407:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  408: #endif
  409:   }
  410:   NEXT_P0;
  411:   NEXT;
  412:   
  413:  dodefer:
  414:   {
  415:     DOCFA;
  416: #ifdef DEBUG
  417:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  418: #endif
  419:     EXEC(*(Xt *)PFA1(cfa));
  420:   }
  421: 
  422:  dofield:
  423:   {
  424:     DOCFA;
  425: #ifdef DEBUG
  426:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  427: #endif
  428:     TOS += *(Cell*)PFA1(cfa);
  429:   }
  430:   NEXT_P0;
  431:   NEXT;
  432: 
  433:  dodoes:
  434:   /* this assumes the following structure:
  435:      defining-word:
  436:      
  437:      ...
  438:      DOES>
  439:      (possible padding)
  440:      possibly handler: jmp dodoes
  441:      (possible branch delay slot(s))
  442:      Forth code after DOES>
  443:      
  444:      defined word:
  445:      
  446:      cfa: address of or jump to handler OR
  447:           address of or jump to dodoes, address of DOES-code
  448:      pfa:
  449:      
  450:      */
  451:   {
  452:     DOCFA;
  453: 
  454:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  455: #ifdef DEBUG
  456:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  457:     fflush(stderr);
  458: #endif
  459:     *--rp = (Cell)ip;
  460:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  461: #ifdef USE_TOS
  462:     *sp-- = TOS;
  463:     TOS = (Cell)PFA(cfa);
  464: #else
  465:     *--sp = (Cell)PFA(cfa);
  466: #endif
  467:     SET_IP(DOES_CODE1(cfa));
  468:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  469:   }
  470:   NEXT;
  471: 
  472: #include "prim.i"
  473: }

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