File:  [gforth] / gforth / engine / engine.c
Revision 1.20: download - view: text, annotated - select for diffs
Thu Jul 27 10:40:42 2000 UTC (20 years ago) by anton
Branches: MAIN
CVS tags: HEAD
The relocator now checks for unimplemented primitives used in the 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: #include <dirent.h>
   42: #ifdef HAVE_FNMATCH_H
   43: #include <fnmatch.h>
   44: #else
   45: #include "fnmatch.h"
   46: #endif
   47: #else
   48: #include "systypes.h"
   49: #endif
   50: 
   51: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   52: #include <dlfcn.h>
   53: #endif
   54: #if defined(_WIN32)
   55: #include <windows.h>
   56: #endif
   57: #ifdef hpux
   58: #include <dl.h>
   59: #endif
   60: 
   61: #ifndef SEEK_SET
   62: /* should be defined in stdio.h, but some systems don't have it */
   63: #define SEEK_SET 0
   64: #endif
   65: 
   66: #define IOR(flag)	((flag)? -512-errno : 0)
   67: 
   68: struct F83Name {
   69:   struct F83Name *next;  /* the link field for old hands */
   70:   char		countetc;
   71:   char		name[0];
   72: };
   73: 
   74: /* are macros for setting necessary? */
   75: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   76: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   77: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   78: 
   79: Cell *SP;
   80: Float *FP;
   81: Address UP=NULL;
   82: 
   83: #if 0
   84: /* not used currently */
   85: int emitcounter;
   86: #endif
   87: #define NULLC '\0'
   88: 
   89: #ifdef MEMCMP_AS_SUBROUTINE
   90: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
   91: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
   92: #endif
   93: 
   94: #ifdef HAS_FILE
   95: char *cstr(Char *from, UCell size, int clear)
   96: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   97:    the C-string lives until the next call of cstr with CLEAR being true */
   98: {
   99:   static struct cstr_buffer {
  100:     char *buffer;
  101:     size_t size;
  102:   } *buffers=NULL;
  103:   static int nbuffers=0;
  104:   static int used=0;
  105:   struct cstr_buffer *b;
  106: 
  107:   if (buffers==NULL)
  108:     buffers=malloc(0);
  109:   if (clear)
  110:     used=0;
  111:   if (used>=nbuffers) {
  112:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
  113:     buffers[used]=(struct cstr_buffer){malloc(0),0};
  114:     nbuffers=used+1;
  115:   }
  116:   b=&buffers[used];
  117:   if (size+1 > b->size) {
  118:     b->buffer = realloc(b->buffer,size+1);
  119:     b->size = size+1;
  120:   }
  121:   memcpy(b->buffer,from,size);
  122:   b->buffer[size]='\0';
  123:   used++;
  124:   return b->buffer;
  125: }
  126: 
  127: char *tilde_cstr(Char *from, UCell size, int clear)
  128: /* like cstr(), but perform tilde expansion on the string */
  129: {
  130:   char *s1,*s2;
  131:   int s1_len, s2_len;
  132:   struct passwd *getpwnam (), *user_entry;
  133: 
  134:   if (size<1 || from[0]!='~')
  135:     return cstr(from, size, clear);
  136:   if (size<2 || from[1]=='/') {
  137:     s1 = (char *)getenv ("HOME");
  138:     if(s1 == NULL)
  139:       s1 = "";
  140:     s2 = from+1;
  141:     s2_len = size-1;
  142:   } else {
  143:     UCell i;
  144:     for (i=1; i<size && from[i]!='/'; i++)
  145:       ;
  146:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
  147:       return cstr(from+3, size<3?0:size-3,clear);
  148:     {
  149:       char user[i];
  150:       memcpy(user,from+1,i-1);
  151:       user[i-1]='\0';
  152:       user_entry=getpwnam(user);
  153:     }
  154:     if (user_entry==NULL)
  155:       return cstr(from, size, clear);
  156:     s1 = user_entry->pw_dir;
  157:     s2 = from+i;
  158:     s2_len = size-i;
  159:   }
  160:   s1_len = strlen(s1);
  161:   if (s1_len>1 && s1[s1_len-1]=='/')
  162:     s1_len--;
  163:   {
  164:     char path[s1_len+s2_len];
  165:     memcpy(path,s1,s1_len);
  166:     memcpy(path+s1_len,s2,s2_len);
  167:     return cstr(path,s1_len+s2_len,clear);
  168:   }
  169: }
  170: #endif
  171: 
  172: #define NEWLINE	'\n'
  173: 
  174: #ifndef HAVE_RINT
  175: #define rint(x)	floor((x)+0.5)
  176: #endif
  177: 
  178: #ifdef HAS_FILE
  179: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
  180: 
  181: #ifndef O_BINARY
  182: #define O_BINARY 0
  183: #endif
  184: #ifndef O_TEXT
  185: #define O_TEXT 0
  186: #endif
  187: 
  188: static int ufileattr[6]= {
  189:   O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
  190:   O_RDWR  |O_BINARY, O_RDWR  |O_BINARY,
  191:   O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
  192: #endif
  193: 
  194: /* if machine.h has not defined explicit registers, define them as implicit */
  195: #ifndef IPREG
  196: #define IPREG
  197: #endif
  198: #ifndef SPREG
  199: #define SPREG
  200: #endif
  201: #ifndef RPREG
  202: #define RPREG
  203: #endif
  204: #ifndef FPREG
  205: #define FPREG
  206: #endif
  207: #ifndef LPREG
  208: #define LPREG
  209: #endif
  210: #ifndef CFAREG
  211: #define CFAREG
  212: #endif
  213: #ifndef UPREG
  214: #define UPREG
  215: #endif
  216: #ifndef TOSREG
  217: #define TOSREG
  218: #endif
  219: #ifndef FTOSREG
  220: #define FTOSREG
  221: #endif
  222: 
  223: #ifndef CPU_DEP1
  224: # define CPU_DEP1 0
  225: #endif
  226: 
  227: /* declare and compute cfa for certain threading variants */
  228: /* warning: this is nonsyntactical; it will not work in place of a statement */
  229: #ifndef GETCFA
  230: #define DOCFA
  231: #else
  232: #define DOCFA	Xt cfa; GETCFA(cfa)
  233: #endif
  234: 
  235: #ifdef GFORTH_DEBUGGING
  236: /* define some VM registers as global variables, so they survive exceptions;
  237:    global register variables are not up to the task (according to the 
  238:    GNU C manual) */
  239: Xt *ip;
  240: Cell *rp;
  241: #endif
  242: 
  243: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  244: /* executes code at ip, if ip!=NULL
  245:    returns array of machine code labels (for use in a loader), if ip==NULL
  246: */
  247: {
  248: #ifndef GFORTH_DEBUGGING
  249:   register Xt *ip IPREG;
  250:   register Cell *rp RPREG;
  251: #endif
  252:   register Cell *sp SPREG = sp0;
  253:   register Float *fp FPREG = fp0;
  254:   register Address lp LPREG = lp0;
  255: #ifdef CFA_NEXT
  256:   register Xt cfa CFAREG;
  257: #endif
  258: #ifdef MORE_VARS
  259:   MORE_VARS
  260: #endif
  261:   register Address up UPREG = UP;
  262:   IF_TOS(register Cell TOS TOSREG;)
  263:   IF_FTOS(register Float FTOS FTOSREG;)
  264: #if defined(DOUBLY_INDIRECT)
  265:   static Label *symbols;
  266:   static void *routines[]= {
  267: #else /* !defined(DOUBLY_INDIRECT) */
  268:   static Label symbols[]= {
  269: #endif /* !defined(DOUBLY_INDIRECT) */
  270:     (Label)&&docol,
  271:     (Label)&&docon,
  272:     (Label)&&dovar,
  273:     (Label)&&douser,
  274:     (Label)&&dodefer,
  275:     (Label)&&dofield,
  276:     (Label)&&dodoes,
  277:     /* the following entry is normally unused;
  278:        it's there because its index indicates a does-handler */
  279:     CPU_DEP1,
  280: #include "prim_lab.i"
  281:     (Label)0
  282:   };
  283: #ifdef CPU_DEP2
  284:   CPU_DEP2
  285: #endif
  286: 
  287:   ip = ip0;
  288:   rp = rp0;
  289: #ifdef DEBUG
  290:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  291:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  292: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  293: #endif
  294: 
  295:   if (ip == NULL) {
  296: #if defined(DOUBLY_INDIRECT)
  297: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  298: #define CODE_OFFSET (22*sizeof(Cell))
  299:     int i;
  300:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  301: 
  302:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  303:     for (i=0; i<DOESJUMP+1; i++)
  304:       symbols[i] = (Label)routines[i];
  305:     for (; routines[i]!=0; i++) {
  306:       if (i>=MAX_SYMBOLS) {
  307: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  308: 	exit(1);
  309:       }
  310:       symbols[i] = &routines[i];
  311:     }
  312: #endif /* defined(DOUBLY_INDIRECT) */
  313:     return symbols;
  314:   }
  315: 
  316:   IF_TOS(TOS = sp[0]);
  317:   IF_FTOS(FTOS = fp[0]);
  318: /*  prep_terminal(); */
  319:   SET_IP(ip);
  320:   NEXT;
  321: 
  322: 
  323: #ifdef CPU_DEP3
  324:   CPU_DEP3
  325: #endif
  326:   
  327:  docol:
  328:   {
  329:     DOCFA;
  330: #ifdef DEBUG
  331:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  332: #endif
  333: #ifdef CISC_NEXT
  334:     /* this is the simple version */
  335:     *--rp = (Cell)ip;
  336:     SET_IP((Xt *)PFA1(cfa));
  337:     NEXT;
  338: #else
  339:     /* this one is important, so we help the compiler optimizing */
  340:     {
  341:       DEF_CA
  342:       rp[-1] = (Cell)ip;
  343:       SET_IP((Xt *)PFA1(cfa));
  344:       NEXT_P1;
  345:       rp--;
  346:       NEXT_P2;
  347:     }
  348: #endif
  349:   }
  350: 
  351:  docon:
  352:   {
  353:     DOCFA;
  354: #ifdef DEBUG
  355:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  356: #endif
  357: #ifdef USE_TOS
  358:     *sp-- = TOS;
  359:     TOS = *(Cell *)PFA1(cfa);
  360: #else
  361:     *--sp = *(Cell *)PFA1(cfa);
  362: #endif
  363:   }
  364:   NEXT_P0;
  365:   NEXT;
  366:   
  367:  dovar:
  368:   {
  369:     DOCFA;
  370: #ifdef DEBUG
  371:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  372: #endif
  373: #ifdef USE_TOS
  374:     *sp-- = TOS;
  375:     TOS = (Cell)PFA1(cfa);
  376: #else
  377:     *--sp = (Cell)PFA1(cfa);
  378: #endif
  379:   }
  380:   NEXT_P0;
  381:   NEXT;
  382:   
  383:  douser:
  384:   {
  385:     DOCFA;
  386: #ifdef DEBUG
  387:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  388: #endif
  389: #ifdef USE_TOS
  390:     *sp-- = TOS;
  391:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  392: #else
  393:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  394: #endif
  395:   }
  396:   NEXT_P0;
  397:   NEXT;
  398:   
  399:  dodefer:
  400:   {
  401:     DOCFA;
  402: #ifdef DEBUG
  403:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  404: #endif
  405:     EXEC(*(Xt *)PFA1(cfa));
  406:   }
  407: 
  408:  dofield:
  409:   {
  410:     DOCFA;
  411: #ifdef DEBUG
  412:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  413: #endif
  414:     TOS += *(Cell*)PFA1(cfa);
  415:   }
  416:   NEXT_P0;
  417:   NEXT;
  418: 
  419:  dodoes:
  420:   /* this assumes the following structure:
  421:      defining-word:
  422:      
  423:      ...
  424:      DOES>
  425:      (possible padding)
  426:      possibly handler: jmp dodoes
  427:      (possible branch delay slot(s))
  428:      Forth code after DOES>
  429:      
  430:      defined word:
  431:      
  432:      cfa: address of or jump to handler OR
  433:           address of or jump to dodoes, address of DOES-code
  434:      pfa:
  435:      
  436:      */
  437:   {
  438:     DOCFA;
  439: 
  440:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  441: #ifdef DEBUG
  442:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  443:     fflush(stderr);
  444: #endif
  445:     *--rp = (Cell)ip;
  446:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  447: #ifdef USE_TOS
  448:     *sp-- = TOS;
  449:     TOS = (Cell)PFA(cfa);
  450: #else
  451:     *--sp = (Cell)PFA(cfa);
  452: #endif
  453:     SET_IP(DOES_CODE1(cfa));
  454:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  455:   }
  456:   NEXT;
  457: 
  458: #include "prim.i"
  459: }

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