File:  [gforth] / gforth / engine / engine.c
Revision 1.3: download - view: text, annotated - select for diffs
Thu Apr 16 15:34:41 1998 UTC (22 years, 10 months ago) by anton
Branches: MAIN
CVS tags: HEAD
bugfix (broken images on Linux/Alpha).

    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 "threaded.h"
   40: 
   41: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   42: #include <dlfcn.h>
   43: #endif
   44: #ifdef hpux
   45: #include <dl.h>
   46: #endif
   47: 
   48: #ifndef SEEK_SET
   49: /* should be defined in stdio.h, but some systems don't have it */
   50: #define SEEK_SET 0
   51: #endif
   52: 
   53: #define IOR(flag)	((flag)? -512-errno : 0)
   54: 
   55: typedef struct F83Name {
   56:   struct F83Name	*next;  /* the link field for old hands */
   57:   char			countetc;
   58:   Char			name[0];
   59: } F83Name;
   60: 
   61: /* are macros for setting necessary? */
   62: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   63: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   64: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   65: 
   66: Cell *SP;
   67: Float *FP;
   68: Address UP=NULL;
   69: 
   70: #if 0
   71: /* not used currently */
   72: int emitcounter;
   73: #endif
   74: #define NULLC '\0'
   75: 
   76: char *cstr(Char *from, UCell size, int clear)
   77: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   78:    the C-string lives until the next call of cstr with CLEAR being true */
   79: {
   80:   static struct cstr_buffer {
   81:     char *buffer;
   82:     size_t size;
   83:   } *buffers=NULL;
   84:   static int nbuffers=0;
   85:   static int used=0;
   86:   struct cstr_buffer *b;
   87: 
   88:   if (buffers==NULL)
   89:     buffers=malloc(0);
   90:   if (clear)
   91:     used=0;
   92:   if (used>=nbuffers) {
   93:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
   94:     buffers[used]=(struct cstr_buffer){malloc(0),0};
   95:     nbuffers=used+1;
   96:   }
   97:   b=&buffers[used];
   98:   if (size+1 > b->size) {
   99:     b->buffer = realloc(b->buffer,size+1);
  100:     b->size = size+1;
  101:   }
  102:   memcpy(b->buffer,from,size);
  103:   b->buffer[size]='\0';
  104:   used++;
  105:   return b->buffer;
  106: }
  107: 
  108: char *tilde_cstr(Char *from, UCell size, int clear)
  109: /* like cstr(), but perform tilde expansion on the string */
  110: {
  111:   char *s1,*s2;
  112:   int s1_len, s2_len;
  113:   struct passwd *getpwnam (), *user_entry;
  114: 
  115:   if (size<1 || from[0]!='~')
  116:     return cstr(from, size, clear);
  117:   if (size<2 || from[1]=='/') {
  118:     s1 = (char *)getenv ("HOME");
  119:     if(s1 == NULL)
  120:       s1 = "";
  121:     s2 = from+1;
  122:     s2_len = size-1;
  123:   } else {
  124:     UCell i;
  125:     for (i=1; i<size && from[i]!='/'; i++)
  126:       ;
  127:     {
  128:       char user[i];
  129:       memcpy(user,from+1,i-1);
  130:       user[i-1]='\0';
  131:       user_entry=getpwnam(user);
  132:     }
  133:     if (user_entry==NULL)
  134:       return cstr(from, size, clear);
  135:     s1 = user_entry->pw_dir;
  136:     s2 = from+i;
  137:     s2_len = size-i;
  138:   }
  139:   s1_len = strlen(s1);
  140:   if (s1_len>1 && s1[s1_len-1]=='/')
  141:     s1_len--;
  142:   {
  143:     char path[s1_len+s2_len];
  144:     memcpy(path,s1,s1_len);
  145:     memcpy(path+s1_len,s2,s2_len);
  146:     return cstr(path,s1_len+s2_len,clear);
  147:   }
  148: }
  149:    
  150: 
  151: #define NEWLINE	'\n'
  152: 
  153: #ifndef HAVE_RINT
  154: #define rint(x)	floor((x)+0.5)
  155: #endif
  156: 
  157: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
  158: 
  159: #ifndef O_BINARY
  160: #define O_BINARY 0
  161: #endif
  162: #ifndef O_TEXT
  163: #define O_TEXT 0
  164: #endif
  165: 
  166: static int ufileattr[6]= {
  167:   O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
  168:   O_RDWR  |O_TEXT, O_RDWR  |O_BINARY,
  169:   O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
  170: 
  171: /* if machine.h has not defined explicit registers, define them as implicit */
  172: #ifndef IPREG
  173: #define IPREG
  174: #endif
  175: #ifndef SPREG
  176: #define SPREG
  177: #endif
  178: #ifndef RPREG
  179: #define RPREG
  180: #endif
  181: #ifndef FPREG
  182: #define FPREG
  183: #endif
  184: #ifndef LPREG
  185: #define LPREG
  186: #endif
  187: #ifndef CFAREG
  188: #define CFAREG
  189: #endif
  190: #ifndef UPREG
  191: #define UPREG
  192: #endif
  193: #ifndef TOSREG
  194: #define TOSREG
  195: #endif
  196: #ifndef FTOSREG
  197: #define FTOSREG
  198: #endif
  199: 
  200: #ifndef CPU_DEP1
  201: # define CPU_DEP1 0
  202: #endif
  203: 
  204: /* declare and compute cfa for certain threading variants */
  205: /* warning: this is nonsyntactical; it will not work in place of a statement */
  206: #ifdef CFA_NEXT
  207: #define DOCFA
  208: #else
  209: #define DOCFA	Xt cfa; GETCFA(cfa)
  210: #endif
  211: 
  212: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  213: /* executes code at ip, if ip!=NULL
  214:    returns array of machine code labels (for use in a loader), if ip==NULL
  215: */
  216: {
  217:   register Xt *ip IPREG = ip0;
  218:   register Cell *sp SPREG = sp0;
  219:   register Cell *rp RPREG = rp0;
  220:   register Float *fp FPREG = fp0;
  221:   register Address lp LPREG = lp0;
  222: #ifdef CFA_NEXT
  223:   register Xt cfa CFAREG;
  224: #endif
  225:   register Address up UPREG = UP;
  226:   IF_TOS(register Cell TOS TOSREG;)
  227:   IF_FTOS(register Float FTOS FTOSREG;)
  228: #if defined(DOUBLY_INDIRECT)
  229:   static Label *symbols;
  230:   static void *routines[]= {
  231: #else /* !defined(DOUBLY_INDIRECT) */
  232:   static Label symbols[]= {
  233: #endif /* !defined(DOUBLY_INDIRECT) */
  234:     &&docol,
  235:     &&docon,
  236:     &&dovar,
  237:     &&douser,
  238:     &&dodefer,
  239:     &&dofield,
  240:     &&dodoes,
  241:     /* the following entry is normally unused;
  242:        it's there because its index indicates a does-handler */
  243:     CPU_DEP1,
  244: #include "prim_lab.i"
  245:     0
  246:   };
  247: #ifdef CPU_DEP2
  248:   CPU_DEP2
  249: #endif
  250: 
  251: #ifdef DEBUG
  252:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  253:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  254: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  255: #endif
  256: 
  257:   if (ip == NULL) {
  258: #if defined(DOUBLY_INDIRECT)
  259: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  260: #define CODE_OFFSET (22*sizeof(Cell))
  261:     int i;
  262:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  263: 
  264:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  265:     for (i=0; i<DOESJUMP+1; i++)
  266:       symbols[i] = (Label)routines[i];
  267:     for (; routines[i]!=0; i++) {
  268:       if (i>=MAX_SYMBOLS) {
  269: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  270: 	exit(1);
  271:     }
  272:     symbols[i] = &routines[i];
  273:   }
  274: #endif /* defined(DOUBLY_INDIRECT) */
  275:   return symbols;
  276: }
  277: 
  278:   IF_TOS(TOS = sp[0]);
  279:   IF_FTOS(FTOS = fp[0]);
  280: /*  prep_terminal(); */
  281:   NEXT_P0;
  282:   NEXT;
  283: 
  284: #ifdef CPU_DEP3
  285:   CPU_DEP3
  286: #endif
  287:   
  288:  docol:
  289:   {
  290:     DOCFA;
  291: #ifdef DEBUG
  292:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  293: #endif
  294: #ifdef CISC_NEXT
  295:     /* this is the simple version */
  296:     *--rp = (Cell)ip;
  297:     ip = (Xt *)PFA1(cfa);
  298:     NEXT_P0;
  299:     NEXT;
  300: #else
  301:     /* this one is important, so we help the compiler optimizing
  302:        The following version may be better (for scheduling), but probably has
  303:        problems with code fields employing calls and delay slots
  304:        */
  305:     {
  306:       DEF_CA
  307:       Xt *current_ip = (Xt *)PFA1(cfa);
  308:       cfa = *current_ip;
  309:       NEXT1_P1;
  310:       *--rp = (Cell)ip;
  311:       ip = current_ip+1;
  312:       NEXT1_P2;
  313:     }
  314: #endif
  315:   }
  316: 
  317:  docon:
  318:   {
  319:     DOCFA;
  320: #ifdef DEBUG
  321:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  322: #endif
  323: #ifdef USE_TOS
  324:     *sp-- = TOS;
  325:     TOS = *(Cell *)PFA1(cfa);
  326: #else
  327:     *--sp = *(Cell *)PFA1(cfa);
  328: #endif
  329:   }
  330:   NEXT_P0;
  331:   NEXT;
  332:   
  333:  dovar:
  334:   {
  335:     DOCFA;
  336: #ifdef DEBUG
  337:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  338: #endif
  339: #ifdef USE_TOS
  340:     *sp-- = TOS;
  341:     TOS = (Cell)PFA1(cfa);
  342: #else
  343:     *--sp = (Cell)PFA1(cfa);
  344: #endif
  345:   }
  346:   NEXT_P0;
  347:   NEXT;
  348:   
  349:  douser:
  350:   {
  351:     DOCFA;
  352: #ifdef DEBUG
  353:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  354: #endif
  355: #ifdef USE_TOS
  356:     *sp-- = TOS;
  357:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  358: #else
  359:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  360: #endif
  361:   }
  362:   NEXT_P0;
  363:   NEXT;
  364:   
  365:  dodefer:
  366:   {
  367:     DOCFA;
  368: #ifdef DEBUG
  369:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  370: #endif
  371:     EXEC(*(Xt *)PFA1(cfa));
  372:   }
  373: 
  374:  dofield:
  375:   {
  376:     DOCFA;
  377: #ifdef DEBUG
  378:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  379: #endif
  380:     TOS += *(Cell*)PFA1(cfa); 
  381:   }
  382:   NEXT_P0;
  383:   NEXT;
  384: 
  385:  dodoes:
  386:   /* this assumes the following structure:
  387:      defining-word:
  388:      
  389:      ...
  390:      DOES>
  391:      (possible padding)
  392:      possibly handler: jmp dodoes
  393:      (possible branch delay slot(s))
  394:      Forth code after DOES>
  395:      
  396:      defined word:
  397:      
  398:      cfa: address of or jump to handler OR
  399:           address of or jump to dodoes, address of DOES-code
  400:      pfa:
  401:      
  402:      */
  403:   {
  404:     DOCFA;
  405: 
  406:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  407: #ifdef DEBUG
  408:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  409:     fflush(stderr);
  410: #endif
  411:     *--rp = (Cell)ip;
  412:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  413:     ip = DOES_CODE1(cfa);
  414: #ifdef USE_TOS
  415:     *sp-- = TOS;
  416:     TOS = (Cell)PFA(cfa);
  417: #else
  418:     *--sp = (Cell)PFA(cfa);
  419: #endif
  420:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  421:   }
  422:   NEXT_P0;
  423:   NEXT;
  424: 
  425: #include "prim.i"
  426: }

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