File:  [gforth] / gforth / Attic / engine.c
Revision 1.38: download - view: text, annotated - select for diffs
Sat Dec 28 17:19:24 1996 UTC (24 years, 10 months ago) by anton
Branches: MAIN
CVS tags: HEAD
use mmap for allocating the dictionary and the stacks on some systems
added installdirs target to Makefile.in.
Use mkinstalldirs instead of install-sh -d.
added version-stamp to avoid recompiling everything after changing Makefile.in.
mostly fixed the maiming of words containing '/' in TAGS
added options --clear-dictionary and --debug.

    1: /* Gforth virtual machine (aka inner interpreter)
    2: 
    3:   Copyright (C) 1995 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 <sys/types.h>
   28: #include <sys/stat.h>
   29: #include <fcntl.h>
   30: #include <assert.h>
   31: #include <stdlib.h>
   32: #include <time.h>
   33: #include <sys/time.h>
   34: #include <unistd.h>
   35: #include <errno.h>
   36: #include <pwd.h>
   37: #include "forth.h"
   38: #include "io.h"
   39: #include "threading.h"
   40: 
   41: #ifndef SEEK_SET
   42: /* should be defined in stdio.h, but some systems don't have it */
   43: #define SEEK_SET 0
   44: #endif
   45: 
   46: #define IOR(flag)	((flag)? -512-errno : 0)
   47: 
   48: typedef struct F83Name {
   49:   struct F83Name	*next;  /* the link field for old hands */
   50:   char			countetc;
   51:   Char			name[0];
   52: } F83Name;
   53: 
   54: /* are macros for setting necessary? */
   55: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   56: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   57: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   58: 
   59: Cell *SP;
   60: Float *FP;
   61: #if 0
   62: /* not used currently */
   63: int emitcounter;
   64: #endif
   65: #define NULLC '\0'
   66: 
   67: char *cstr(Char *from, UCell size, int clear)
   68: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   69:    the C-string lives until the next call of cstr with CLEAR being true */
   70: {
   71:   static struct cstr_buffer {
   72:     char *buffer;
   73:     size_t size;
   74:   } *buffers=NULL;
   75:   static int nbuffers=0;
   76:   static int used=0;
   77:   struct cstr_buffer *b;
   78: 
   79:   if (buffers==NULL)
   80:     buffers=malloc(0);
   81:   if (clear)
   82:     used=0;
   83:   if (used>=nbuffers) {
   84:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
   85:     buffers[used]=(struct cstr_buffer){malloc(0),0};
   86:     nbuffers=used+1;
   87:   }
   88:   b=&buffers[used];
   89:   if (size+1 > b->size) {
   90:     b->buffer = realloc(b->buffer,size+1);
   91:     b->size = size+1;
   92:   }
   93:   memcpy(b->buffer,from,size);
   94:   b->buffer[size]='\0';
   95:   used++;
   96:   return b->buffer;
   97: }
   98: 
   99: char *tilde_cstr(Char *from, UCell size, int clear)
  100: /* like cstr(), but perform tilde expansion on the string */
  101: {
  102:   char *s1,*s2;
  103:   int s1_len, s2_len;
  104:   struct passwd *getpwnam (), *user_entry;
  105: 
  106:   if (size<1 || from[0]!='~')
  107:     return cstr(from, size, clear);
  108:   if (size<2 || from[1]=='/') {
  109:     s1 = (char *)getenv ("HOME");
  110:     s2 = from+1;
  111:     s2_len = size-1;
  112:   } else {
  113:     int i;
  114:     for (i=1; i<size && from[i]!='/'; i++)
  115:       ;
  116:     {
  117:       char user[i];
  118:       memcpy(user,from+1,i-1);
  119:       user[i-1]='\0';
  120:       user_entry=getpwnam(user);
  121:     }
  122:     if (user_entry==NULL)
  123:       return cstr(from, size, clear);
  124:     s1 = user_entry->pw_dir;
  125:     s2 = from+i;
  126:     s2_len = size-i;
  127:   }
  128:   s1_len = strlen(s1);
  129:   if (s1_len>1 && s1[s1_len-1]=='/')
  130:     s1_len--;
  131:   {
  132:     char path[s1_len+s2_len];
  133:     memcpy(path,s1,s1_len);
  134:     memcpy(path+s1_len,s2,s2_len);
  135:     return cstr(path,s1_len+s2_len,clear);
  136:   }
  137: }
  138:    
  139: 
  140: #define NEWLINE	'\n'
  141: 
  142: #ifndef HAVE_RINT
  143: #define rint(x)	floor((x)+0.5)
  144: #endif
  145: 
  146: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
  147: 
  148: static Address up0=NULL;
  149: 
  150: /* if machine.h has not defined explicit registers, define them as implicit */
  151: #ifndef IPREG
  152: #define IPREG
  153: #endif
  154: #ifndef SPREG
  155: #define SPREG
  156: #endif
  157: #ifndef RPREG
  158: #define RPREG
  159: #endif
  160: #ifndef FPREG
  161: #define FPREG
  162: #endif
  163: #ifndef LPREG
  164: #define LPREG
  165: #endif
  166: #ifndef CFAREG
  167: #define CFAREG
  168: #endif
  169: #ifndef UPREG
  170: #define UPREG
  171: #endif
  172: #ifndef TOSREG
  173: #define TOSREG
  174: #endif
  175: #ifndef FTOSREG
  176: #define FTOSREG
  177: #endif
  178: 
  179: /* declare and compute cfa for certain threading variants */
  180: /* warning: this is nonsyntactical; it will not work in place of a statement */
  181: #ifdef CFA_NEXT
  182: #define DOCFA
  183: #else
  184: #define DOCFA	Xt cfa; GETCFA(cfa)
  185: #endif
  186: 
  187: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  188: /* executes code at ip, if ip!=NULL
  189:    returns array of machine code labels (for use in a loader), if ip==NULL
  190: */
  191: {
  192:   register Xt *ip IPREG = ip0;
  193:   register Cell *sp SPREG = sp0;
  194:   register Cell *rp RPREG = rp0;
  195:   register Float *fp FPREG = fp0;
  196:   register Address lp LPREG = lp0;
  197: #ifdef CFA_NEXT
  198:   register Xt cfa CFAREG;
  199: #endif
  200:   register Address up UPREG = up0;
  201:   IF_TOS(register Cell TOS TOSREG;)
  202:   IF_FTOS(register Float FTOS FTOSREG;)
  203:   static Label symbols[]= {
  204:     &&docol,
  205:     &&docon,
  206:     &&dovar,
  207:     &&douser,
  208:     &&dodefer,
  209:     &&dofield,
  210:     &&dodoes,
  211:     /* the following entry is normally unused;
  212:        it's there because its index indicates a does-handler */
  213: #ifdef CPU_DEP1
  214:     CPU_DEP1,
  215: #else
  216:     (Label)0,
  217: #endif
  218: #include "prim_labels.i"
  219:     (Label)0
  220:   };
  221: #ifdef CPU_DEP2
  222:   CPU_DEP2
  223: #endif
  224: 
  225: #ifdef DEBUG
  226:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  227:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  228: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  229: #endif
  230: 
  231:   if (ip == NULL)
  232:     return symbols;
  233: 
  234:   IF_TOS(TOS = sp[0]);
  235:   IF_FTOS(FTOS = fp[0]);
  236: /*  prep_terminal(); */
  237:   NEXT_P0;
  238:   NEXT;
  239: 
  240: #ifdef CPU_DEP3
  241:   CPU_DEP3
  242: #endif
  243:   
  244:  docol:
  245:   {
  246:     DOCFA;
  247: #ifdef DEBUG
  248:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  249: #endif
  250: #ifdef CISC_NEXT
  251:     /* this is the simple version */
  252:     *--rp = (Cell)ip;
  253:     ip = (Xt *)PFA1(cfa);
  254:     NEXT_P0;
  255:     NEXT;
  256: #else
  257:     /* this one is important, so we help the compiler optimizing
  258:        The following version may be better (for scheduling), but probably has
  259:        problems with code fields employing calls and delay slots
  260:        */
  261:     {
  262:       DEF_CA
  263:       Xt *current_ip = (Xt *)PFA1(cfa);
  264:       cfa = *current_ip;
  265:       NEXT1_P1;
  266:       *--rp = (Cell)ip;
  267:       ip = current_ip+1;
  268:       NEXT1_P2;
  269:     }
  270: #endif
  271:   }
  272: 
  273:  docon:
  274:   {
  275:     DOCFA;
  276: #ifdef DEBUG
  277:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  278: #endif
  279: #ifdef USE_TOS
  280:     *sp-- = TOS;
  281:     TOS = *(Cell *)PFA1(cfa);
  282: #else
  283:     *--sp = *(Cell *)PFA1(cfa);
  284: #endif
  285:   }
  286:   NEXT_P0;
  287:   NEXT;
  288:   
  289:  dovar:
  290:   {
  291:     DOCFA;
  292: #ifdef DEBUG
  293:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  294: #endif
  295: #ifdef USE_TOS
  296:     *sp-- = TOS;
  297:     TOS = (Cell)PFA1(cfa);
  298: #else
  299:     *--sp = (Cell)PFA1(cfa);
  300: #endif
  301:   }
  302:   NEXT_P0;
  303:   NEXT;
  304:   
  305:  douser:
  306:   {
  307:     DOCFA;
  308: #ifdef DEBUG
  309:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  310: #endif
  311: #ifdef USE_TOS
  312:     *sp-- = TOS;
  313:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  314: #else
  315:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  316: #endif
  317:   }
  318:   NEXT_P0;
  319:   NEXT;
  320:   
  321:  dodefer:
  322:   {
  323:     DOCFA;
  324: #ifdef DEBUG
  325:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  326: #endif
  327:     EXEC(*(Xt *)PFA1(cfa));
  328:   }
  329: 
  330:  dofield:
  331:   {
  332:     DOCFA;
  333: #ifdef DEBUG
  334:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  335: #endif
  336:     TOS += *(Cell*)PFA1(cfa); 
  337:   }
  338:   NEXT_P0;
  339:   NEXT;
  340: 
  341:  dodoes:
  342:   /* this assumes the following structure:
  343:      defining-word:
  344:      
  345:      ...
  346:      DOES>
  347:      (possible padding)
  348:      possibly handler: jmp dodoes
  349:      (possible branch delay slot(s))
  350:      Forth code after DOES>
  351:      
  352:      defined word:
  353:      
  354:      cfa: address of or jump to handler OR
  355:           address of or jump to dodoes, address of DOES-code
  356:      pfa:
  357:      
  358:      */
  359:   {
  360:     DOCFA;
  361: 
  362:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  363: #ifdef DEBUG
  364:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  365:     fflush(stderr);
  366: #endif
  367:     *--rp = (Cell)ip;
  368:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  369:     ip = DOES_CODE1(cfa);
  370: #ifdef USE_TOS
  371:     *sp-- = TOS;
  372:     TOS = (Cell)PFA(cfa);
  373: #else
  374:     *--sp = (Cell)PFA(cfa);
  375: #endif
  376:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  377:   }
  378:   NEXT_P0;
  379:   NEXT;
  380: 
  381: #include "primitives.i"
  382: }

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