File:  [gforth] / gforth / engine / engine.c
Revision 1.37: download - view: text, annotated - select for diffs
Fri Jan 4 20:31:54 2002 UTC (18 years, 7 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Modified cross to get closer to mixed threading
Added a few debugging aids

    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: undefine(`symbols')
   23: 
   24: #include "config.h"
   25: #include "forth.h"
   26: #include <ctype.h>
   27: #include <stdio.h>
   28: #include <string.h>
   29: #include <math.h>
   30: #include <assert.h>
   31: #include <stdlib.h>
   32: #include <errno.h>
   33: #include "io.h"
   34: #include "threaded.h"
   35: #ifndef STANDALONE
   36: #include <sys/types.h>
   37: #include <sys/stat.h>
   38: #include <fcntl.h>
   39: #include <time.h>
   40: #include <sys/time.h>
   41: #include <unistd.h>
   42: #include <pwd.h>
   43: #include <dirent.h>
   44: #include <sys/resource.h>
   45: #ifdef HAVE_FNMATCH_H
   46: #include <fnmatch.h>
   47: #else
   48: #include "fnmatch.h"
   49: #endif
   50: #else
   51: #include "systypes.h"
   52: #endif
   53: 
   54: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   55: #include <dlfcn.h>
   56: #endif
   57: #if defined(_WIN32)
   58: #include <windows.h>
   59: #endif
   60: #ifdef hpux
   61: #include <dl.h>
   62: #endif
   63: 
   64: #ifndef SEEK_SET
   65: /* should be defined in stdio.h, but some systems don't have it */
   66: #define SEEK_SET 0
   67: #endif
   68: 
   69: #define IOR(flag)	((flag)? -512-errno : 0)
   70: 
   71: struct F83Name {
   72:   struct F83Name *next;  /* the link field for old hands */
   73:   char		countetc;
   74:   char		name[0];
   75: };
   76: 
   77: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   78: 
   79: struct Longname {
   80:   struct Longname *next;  /* the link field for old hands */
   81:   Cell		countetc;
   82:   char		name[0];
   83: };
   84: 
   85: #define LONGNAME_COUNT(np)	((np)->countetc & (((~((UCell)0))<<3)>>3))
   86: 
   87: Cell *SP;
   88: Float *FP;
   89: Address UP=NULL;
   90: 
   91: #if 0
   92: /* not used currently */
   93: int emitcounter;
   94: #endif
   95: #define NULLC '\0'
   96: 
   97: #ifdef MEMCMP_AS_SUBROUTINE
   98: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
   99: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
  100: #endif
  101: 
  102: #ifdef HAS_FILE
  103: char *cstr(Char *from, UCell size, int clear)
  104: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
  105:    the C-string lives until the next call of cstr with CLEAR being true */
  106: {
  107:   static struct cstr_buffer {
  108:     char *buffer;
  109:     size_t size;
  110:   } *buffers=NULL;
  111:   static int nbuffers=0;
  112:   static int used=0;
  113:   struct cstr_buffer *b;
  114: 
  115:   if (buffers==NULL)
  116:     buffers=malloc(0);
  117:   if (clear)
  118:     used=0;
  119:   if (used>=nbuffers) {
  120:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
  121:     buffers[used]=(struct cstr_buffer){malloc(0),0};
  122:     nbuffers=used+1;
  123:   }
  124:   b=&buffers[used];
  125:   if (size+1 > b->size) {
  126:     b->buffer = realloc(b->buffer,size+1);
  127:     b->size = size+1;
  128:   }
  129:   memcpy(b->buffer,from,size);
  130:   b->buffer[size]='\0';
  131:   used++;
  132:   return b->buffer;
  133: }
  134: 
  135: char *tilde_cstr(Char *from, UCell size, int clear)
  136: /* like cstr(), but perform tilde expansion on the string */
  137: {
  138:   char *s1,*s2;
  139:   int s1_len, s2_len;
  140:   struct passwd *getpwnam (), *user_entry;
  141: 
  142:   if (size<1 || from[0]!='~')
  143:     return cstr(from, size, clear);
  144:   if (size<2 || from[1]=='/') {
  145:     s1 = (char *)getenv ("HOME");
  146:     if(s1 == NULL)
  147:       s1 = "";
  148:     s2 = from+1;
  149:     s2_len = size-1;
  150:   } else {
  151:     UCell i;
  152:     for (i=1; i<size && from[i]!='/'; i++)
  153:       ;
  154:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
  155:       return cstr(from+3, size<3?0:size-3,clear);
  156:     {
  157:       char user[i];
  158:       memcpy(user,from+1,i-1);
  159:       user[i-1]='\0';
  160:       user_entry=getpwnam(user);
  161:     }
  162:     if (user_entry==NULL)
  163:       return cstr(from, size, clear);
  164:     s1 = user_entry->pw_dir;
  165:     s2 = from+i;
  166:     s2_len = size-i;
  167:   }
  168:   s1_len = strlen(s1);
  169:   if (s1_len>1 && s1[s1_len-1]=='/')
  170:     s1_len--;
  171:   {
  172:     char path[s1_len+s2_len];
  173:     memcpy(path,s1,s1_len);
  174:     memcpy(path+s1_len,s2,s2_len);
  175:     return cstr(path,s1_len+s2_len,clear);
  176:   }
  177: }
  178: #endif
  179: 
  180: DCell timeval2us(struct timeval *tvp)
  181: {
  182: #ifndef BUGGY_LONG_LONG
  183:   return (tvp->tv_sec*(DCell)1000000)+tvp->tv_usec;
  184: #else
  185:   DCell d2;
  186:   DCell d1=mmul(tvp->tv_sec,1000000);
  187:   d2.lo = d1.lo+tvp->tv_usec;
  188:   d2.hi = d1.hi + (d2.lo<d1.lo);
  189:   return d2;
  190: #endif
  191: }
  192: 
  193: #define NEWLINE	'\n'
  194: 
  195: #ifndef HAVE_RINT
  196: #define rint(x)	floor((x)+0.5)
  197: #endif
  198: 
  199: #ifdef HAS_FILE
  200: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
  201: static char* pfileattr[6]={"r","r","r+","r+","w","w"};
  202: 
  203: #ifndef O_BINARY
  204: #define O_BINARY 0
  205: #endif
  206: #ifndef O_TEXT
  207: #define O_TEXT 0
  208: #endif
  209: 
  210: static int ufileattr[6]= {
  211:   O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
  212:   O_RDWR  |O_BINARY, O_RDWR  |O_BINARY,
  213:   O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
  214: #endif
  215: 
  216: /* conversion on fetch */
  217: 
  218: #define vm_Cell2f(x)		((Bool)(x))
  219: #define vm_Cell2c(x)		((Char)(x))
  220: #define vm_Cell2n(x)		((Cell)x)
  221: #define vm_Cell2w(x)		((Cell)x)
  222: #define vm_Cell2u(x)		((UCell)(x))
  223: #define vm_Cell2a_(x)		((Cell *)(x))
  224: #define vm_Cell2c_(x)		((Char *)(x))
  225: #define vm_Cell2f_(x)		((Float *)(x))
  226: #define vm_Cell2df_(x)		((DFloat *)(x))
  227: #define vm_Cell2sf_(x)		((SFloat *)(x))
  228: #define vm_Cell2xt(x)		((Xt)(x))
  229: #define vm_Cell2f83name(x)	((struct F83Name *)(x))
  230: #define vm_Cell2longname(x)	((struct Longname *)(x))
  231: #define vm_Float2r(x)	(x)
  232: 
  233: /* conversion on store */
  234: 
  235: #define vm_f2Cell(x)		((Cell)(x))
  236: #define vm_c2Cell(x)		((Cell)(x))
  237: #define vm_n2Cell(x)		((Cell)(x))
  238: #define vm_w2Cell(x)		((Cell)(x))
  239: #define vm_u2Cell(x)		((Cell)(x))
  240: #define vm_a_2Cell(x)		((Cell)(x))
  241: #define vm_c_2Cell(x)		((Cell)(x))
  242: #define vm_f_2Cell(x)		((Cell)(x))
  243: #define vm_df_2Cell(x)		((Cell)(x))
  244: #define vm_sf_2Cell(x)		((Cell)(x))
  245: #define vm_xt2Cell(x)		((Cell)(x))
  246: #define vm_f83name2Cell(x)	((Cell)(x))
  247: #define vm_longname2Cell(x)	((Cell)(x))
  248: #define vm_r2Float(x)	(x)
  249: 
  250: #define vm_Cell2Cell(x)		(x)
  251: 
  252: /* if machine.h has not defined explicit registers, define them as implicit */
  253: #ifndef IPREG
  254: #define IPREG
  255: #endif
  256: #ifndef SPREG
  257: #define SPREG
  258: #endif
  259: #ifndef RPREG
  260: #define RPREG
  261: #endif
  262: #ifndef FPREG
  263: #define FPREG
  264: #endif
  265: #ifndef LPREG
  266: #define LPREG
  267: #endif
  268: #ifndef CFAREG
  269: #define CFAREG
  270: #endif
  271: #ifndef UPREG
  272: #define UPREG
  273: #endif
  274: #ifndef TOSREG
  275: #define TOSREG
  276: #endif
  277: #ifndef FTOSREG
  278: #define FTOSREG
  279: #endif
  280: 
  281: #ifndef CPU_DEP1
  282: # define CPU_DEP1 0
  283: #endif
  284: 
  285: /* declare and compute cfa for certain threading variants */
  286: /* warning: this is nonsyntactical; it will not work in place of a statement */
  287: #ifndef GETCFA
  288: #define DOCFA
  289: #else
  290: #define DOCFA	Xt cfa; GETCFA(cfa)
  291: #endif
  292: 
  293: /* instructions containing these must be the last instruction of a
  294:    super-instruction (e.g., branches, EXECUTE, and other instructions
  295:    ending the basic block). Instructions containing SET_IP get this
  296:    automatically, so you usually don't have to write it.  If you have
  297:    to write it, write it after IP points to the next instruction.
  298:    Used for profiling.  Don't write it in a word containing SET_IP, or
  299:    the following block will be counted twice. */
  300: #ifdef VM_PROFILING
  301: #define SUPER_END  vm_count_block(IP)
  302: #else
  303: #define SUPER_END
  304: #endif
  305: #define SUPER_CONTINUE
  306: 
  307: #ifdef GFORTH_DEBUGGING
  308: /* define some VM registers as global variables, so they survive exceptions;
  309:    global register variables are not up to the task (according to the 
  310:    GNU C manual) */
  311: Xt *ip;
  312: Cell *rp;
  313: #endif
  314: 
  315: #ifdef DEBUG
  316: #define CFA_TO_NAME(__cfa) \
  317:       Cell len, i; \
  318:       char * name = __cfa; \
  319:       for(i=0; i<32; i+=sizeof(Cell)) { \
  320:         len = ((Cell*)name)[-1]; \
  321:         if(len < 0) { \
  322: 	  len &= 0x1F; \
  323:           if((len+sizeof(Cell)) > i) break; \
  324: 	} len = 0; \
  325: 	name -= sizeof(Cell); \
  326:       }
  327: #endif
  328: 
  329: Xt *primtable(Label symbols[], Cell size)
  330: {
  331: #ifdef DIRECT_THREADED
  332:   return symbols;
  333: #else /* !defined(DIRECT_THREADED) */
  334:   Xt *xts = (Xt *)malloc(size*sizeof(Xt));
  335:   Cell i;
  336: 
  337:   for (i=0; i<size; i++)
  338:     xts[i] = &symbols[i];
  339:   return xts;
  340: #endif /* !defined(DIRECT_THREADED) */
  341: }
  342: 
  343: 
  344: define(enginerest,
  345: `(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  346: /* executes code at ip, if ip!=NULL
  347:    returns array of machine code labels (for use in a loader), if ip==NULL
  348: */
  349: {
  350: #ifndef GFORTH_DEBUGGING
  351:   register Xt *ip IPREG;
  352:   register Cell *rp RPREG;
  353: #endif
  354:   register Cell *sp SPREG = sp0;
  355:   register Float *fp FPREG = fp0;
  356:   register Address lp LPREG = lp0;
  357: #ifdef CFA_NEXT
  358:   register Xt cfa CFAREG;
  359: #endif
  360: #ifdef MORE_VARS
  361:   MORE_VARS
  362: #endif
  363:   register Address up UPREG = UP;
  364:   IF_spTOS(register Cell spTOS TOSREG;)
  365:   IF_fpTOS(register Float fpTOS FTOSREG;)
  366: #if defined(DOUBLY_INDIRECT)
  367:   static Label *symbols;
  368:   static void *routines[]= {
  369: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  370: #else /* !defined(DOUBLY_INDIRECT) */
  371:   static Label symbols[]= {
  372: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
  373: #endif /* !defined(DOUBLY_INDIRECT) */
  374:     (Label)&&docol,
  375:     (Label)&&docon,
  376:     (Label)&&dovar,
  377:     (Label)&&douser,
  378:     (Label)&&dodefer,
  379:     (Label)&&dofield,
  380:     (Label)&&dodoes,
  381:     /* the following entry is normally unused;
  382:        it is there because its index indicates a does-handler */
  383:     CPU_DEP1,
  384: #define INST_ADDR(name) (Label)&&I_##name
  385: #include "prim_lab.i"
  386: #undef INST_ADDR
  387:     (Label)&&after_last,
  388:     (Label)0,
  389: #ifdef IN_ENGINE2
  390: #define INST_ADDR(name) (Label)&&J_##name
  391: #include "prim_lab.i"
  392: #undef INST_ADDR
  393: #endif
  394:   };
  395: #ifdef CPU_DEP2
  396:   CPU_DEP2
  397: #endif
  398: 
  399:   ip = ip0;
  400:   rp = rp0;
  401: #ifdef DEBUG
  402:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  403:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  404: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  405: #endif
  406: 
  407:   if (ip == NULL) {
  408: #if defined(DOUBLY_INDIRECT)
  409: #define CODE_OFFSET (22*sizeof(Cell))
  410:     int i;
  411:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  412: 
  413:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  414:     for (i=0; i<DOESJUMP+1; i++)
  415:       symbols[i] = (Label)routines[i];
  416:     for (; routines[i]!=0; i++) {
  417:       if (i>=MAX_SYMBOLS) {
  418: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  419: 	exit(1);
  420:       }
  421:       symbols[i] = &routines[i];
  422:     }
  423: #endif /* defined(DOUBLY_INDIRECT) */
  424:     return symbols;
  425:   }
  426: 
  427:   IF_spTOS(spTOS = sp[0]);
  428:   IF_fpTOS(fpTOS = fp[0]);
  429: /*  prep_terminal(); */
  430:   SET_IP(ip);
  431:   SUPER_END; /* count the first block, too */
  432:   NEXT;
  433: 
  434: 
  435: #ifdef CPU_DEP3
  436:   CPU_DEP3
  437: #endif
  438:   
  439:  docol:
  440:   {
  441:     DOCFA;
  442: #ifdef DEBUG
  443:     {
  444:       CFA_TO_NAME(cfa);
  445:       fprintf(stderr,"%08lx: col: %08lx %.*s\n",(Cell)ip,(Cell)PFA1(cfa),
  446: 	      len,name);
  447:     }
  448: #endif
  449: #ifdef CISC_NEXT
  450:     /* this is the simple version */
  451:     *--rp = (Cell)ip;
  452:     SET_IP((Xt *)PFA1(cfa));
  453:     SUPER_END;
  454:     NEXT;
  455: #else
  456:     /* this one is important, so we help the compiler optimizing */
  457:     {
  458:       DEF_CA
  459:       rp[-1] = (Cell)ip;
  460:       SET_IP((Xt *)PFA1(cfa));
  461:       SUPER_END;
  462:       NEXT_P1;
  463:       rp--;
  464:       NEXT_P2;
  465:     }
  466: #endif
  467:   }
  468: 
  469:  docon:
  470:   {
  471:     DOCFA;
  472: #ifdef DEBUG
  473:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  474: #endif
  475: #ifdef USE_TOS
  476:     *sp-- = spTOS;
  477:     spTOS = *(Cell *)PFA1(cfa);
  478: #else
  479:     *--sp = *(Cell *)PFA1(cfa);
  480: #endif
  481:   }
  482:   NEXT_P0;
  483:   NEXT;
  484:   
  485:  dovar:
  486:   {
  487:     DOCFA;
  488: #ifdef DEBUG
  489:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  490: #endif
  491: #ifdef USE_TOS
  492:     *sp-- = spTOS;
  493:     spTOS = (Cell)PFA1(cfa);
  494: #else
  495:     *--sp = (Cell)PFA1(cfa);
  496: #endif
  497:   }
  498:   NEXT_P0;
  499:   NEXT;
  500:   
  501:  douser:
  502:   {
  503:     DOCFA;
  504: #ifdef DEBUG
  505:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  506: #endif
  507: #ifdef USE_TOS
  508:     *sp-- = spTOS;
  509:     spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
  510: #else
  511:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  512: #endif
  513:   }
  514:   NEXT_P0;
  515:   NEXT;
  516:   
  517:  dodefer:
  518:   {
  519:     DOCFA;
  520: #ifdef DEBUG
  521:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  522: #endif
  523:     SUPER_END;
  524:     EXEC(*(Xt *)PFA1(cfa));
  525:   }
  526: 
  527:  dofield:
  528:   {
  529:     DOCFA;
  530: #ifdef DEBUG
  531:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  532: #endif
  533:     spTOS += *(Cell*)PFA1(cfa);
  534:   }
  535:   NEXT_P0;
  536:   NEXT;
  537: 
  538:  dodoes:
  539:   /* this assumes the following structure:
  540:      defining-word:
  541:      
  542:      ...
  543:      DOES>
  544:      (possible padding)
  545:      possibly handler: jmp dodoes
  546:      (possible branch delay slot(s))
  547:      Forth code after DOES>
  548:      
  549:      defined word:
  550:      
  551:      cfa: address of or jump to handler OR
  552:           address of or jump to dodoes, address of DOES-code
  553:      pfa:
  554:      
  555:      */
  556:   {
  557:     DOCFA;
  558: 
  559:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  560: #ifdef DEBUG
  561:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  562:     fflush(stderr);
  563: #endif
  564:     *--rp = (Cell)ip;
  565:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  566: #ifdef USE_TOS
  567:     *sp-- = spTOS;
  568:     spTOS = (Cell)PFA(cfa);
  569: #else
  570:     *--sp = (Cell)PFA(cfa);
  571: #endif
  572:     SET_IP(DOES_CODE1(cfa));
  573:     SUPER_END;
  574:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
  575:   }
  576:   NEXT;
  577: 
  578: #ifndef IN_ENGINE2
  579: #define LABEL(name) I_##name
  580: #else
  581: #define LABEL(name) J_##name: asm(".skip 16"); I_##name
  582: #endif
  583: #include "prim.i"
  584: #undef LABEL
  585:   after_last: return (Label *)0;
  586:   /*needed only to get the length of the last primitive */
  587: }'
  588: )
  589: 
  590: Label *engine enginerest
  591: 
  592: #define IN_ENGINE2
  593: Label *engine2 enginerest
  594: 

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