File:  [gforth] / gforth / engine / engine.c
Revision 1.13: download - view: text, annotated - select for diffs
Thu Jun 17 15:32:14 1999 UTC (21 years, 4 months ago) by anton
Branches: MAIN
CVS tags: HEAD
fixed bug (path handling when opening image).

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

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>