File:  [gforth] / gforth / engine / engine.c
Revision 1.39: download - view: text, annotated - select for diffs
Sun Jan 20 19:04:11 2002 UTC (18 years, 4 months ago) by anton
Branches: MAIN
CVS tags: HEAD
hybrid direct/indirect threading (replaces direct threading)

    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: /* instructions containing these must be the last instruction of a
  286:    super-instruction (e.g., branches, EXECUTE, and other instructions
  287:    ending the basic block). Instructions containing SET_IP get this
  288:    automatically, so you usually don't have to write it.  If you have
  289:    to write it, write it after IP points to the next instruction.
  290:    Used for profiling.  Don't write it in a word containing SET_IP, or
  291:    the following block will be counted twice. */
  292: #ifdef VM_PROFILING
  293: #define SUPER_END  vm_count_block(IP)
  294: #else
  295: #define SUPER_END
  296: #endif
  297: #define SUPER_CONTINUE
  298: 
  299: #ifdef GFORTH_DEBUGGING
  300: /* define some VM registers as global variables, so they survive exceptions;
  301:    global register variables are not up to the task (according to the 
  302:    GNU C manual) */
  303: Xt *ip;
  304: Cell *rp;
  305: #endif
  306: 
  307: #ifdef DEBUG
  308: #define CFA_TO_NAME(__cfa) \
  309:       Cell len, i; \
  310:       char * name = __cfa; \
  311:       for(i=0; i<32; i+=sizeof(Cell)) { \
  312:         len = ((Cell*)name)[-1]; \
  313:         if(len < 0) { \
  314: 	  len &= 0x1F; \
  315:           if((len+sizeof(Cell)) > i) break; \
  316: 	} len = 0; \
  317: 	name -= sizeof(Cell); \
  318:       }
  319: #endif
  320: 
  321: Xt *primtable(Label symbols[], Cell size)
  322:      /* used in primitive primtable for peephole optimization */
  323: {
  324: #ifdef DIRECT_THREADED
  325:   return symbols;
  326: #else /* !defined(DIRECT_THREADED) */
  327:   Xt *xts = (Xt *)malloc(size*sizeof(Xt));
  328:   Cell i;
  329: 
  330:   for (i=0; i<size; i++)
  331:     xts[i] = &symbols[i];
  332:   return xts;
  333: #endif /* !defined(DIRECT_THREADED) */
  334: }
  335: 
  336: 
  337: define(enginerest,
  338: `(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  339: /* executes code at ip, if ip!=NULL
  340:    returns array of machine code labels (for use in a loader), if ip==NULL
  341: */
  342: {
  343: #ifndef GFORTH_DEBUGGING
  344:   register Xt *ip IPREG;
  345:   register Cell *rp RPREG;
  346: #endif
  347:   register Cell *sp SPREG = sp0;
  348:   register Float *fp FPREG = fp0;
  349:   register Address lp LPREG = lp0;
  350:   register Xt cfa CFAREG;
  351: #ifdef MORE_VARS
  352:   MORE_VARS
  353: #endif
  354:   register Address up UPREG = UP;
  355:   IF_spTOS(register Cell spTOS TOSREG;)
  356:   IF_fpTOS(register Float fpTOS FTOSREG;)
  357: #if defined(DOUBLY_INDIRECT)
  358:   static Label *symbols;
  359:   static void *routines[]= {
  360: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  361: #else /* !defined(DOUBLY_INDIRECT) */
  362:   static Label symbols[]= {
  363: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
  364: #endif /* !defined(DOUBLY_INDIRECT) */
  365:     (Label)&&docol,
  366:     (Label)&&docon,
  367:     (Label)&&dovar,
  368:     (Label)&&douser,
  369:     (Label)&&dodefer,
  370:     (Label)&&dofield,
  371:     (Label)&&dodoes,
  372:     /* the following entry is normally unused;
  373:        it is there because its index indicates a does-handler */
  374:     CPU_DEP1,
  375: #define INST_ADDR(name) (Label)&&I_##name
  376: #include "prim_lab.i"
  377: #undef INST_ADDR
  378:     (Label)&&after_last,
  379:     (Label)0,
  380: #ifdef IN_ENGINE2
  381: #define INST_ADDR(name) (Label)&&J_##name
  382: #include "prim_lab.i"
  383: #undef INST_ADDR
  384: #endif
  385:   };
  386: #ifdef CPU_DEP2
  387:   CPU_DEP2
  388: #endif
  389: 
  390:   ip = ip0;
  391:   rp = rp0;
  392: #ifdef DEBUG
  393:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  394:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  395: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  396: #endif
  397: 
  398:   if (ip == NULL) {
  399: #if defined(DOUBLY_INDIRECT)
  400: #define CODE_OFFSET (26*sizeof(Cell))
  401: #define XT_OFFSET (22*sizeof(Cell))
  402:     int i;
  403:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  404:     Cell xt_offset = offset_image? XT_OFFSET : 0;
  405: 
  406:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  407:     xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
  408:     for (i=0; i<DOESJUMP+1; i++)
  409:       xts[i] = symbols[i] = (Label)routines[i];
  410:     for (; routines[i]!=0; i++) {
  411:       if (i>=MAX_SYMBOLS) {
  412: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  413: 	exit(1);
  414:       }
  415:       xts[i] = symbols[i] = &routines[i];
  416:     }
  417: #endif /* defined(DOUBLY_INDIRECT) */
  418:     return symbols;
  419:   }
  420: 
  421:   IF_spTOS(spTOS = sp[0]);
  422:   IF_fpTOS(fpTOS = fp[0]);
  423: /*  prep_terminal(); */
  424:   SET_IP(ip);
  425:   SUPER_END; /* count the first block, too */
  426:   NEXT;
  427: 
  428: 
  429: #ifdef CPU_DEP3
  430:   CPU_DEP3
  431: #endif
  432:   
  433:  docol:
  434:   {
  435: #ifdef DEBUG
  436:     {
  437:       CFA_TO_NAME(cfa);
  438:       fprintf(stderr,"%08lx: col: %08lx %.*s\n",(Cell)ip,(Cell)PFA1(cfa),
  439: 	      len,name);
  440:     }
  441: #endif
  442: #ifdef CISC_NEXT
  443:     /* this is the simple version */
  444:     *--rp = (Cell)ip;
  445:     SET_IP((Xt *)PFA1(cfa));
  446:     SUPER_END;
  447:     NEXT;
  448: #else
  449:     /* this one is important, so we help the compiler optimizing */
  450:     {
  451:       DEF_CA
  452:       rp[-1] = (Cell)ip;
  453:       SET_IP((Xt *)PFA1(cfa));
  454:       SUPER_END;
  455:       NEXT_P1;
  456:       rp--;
  457:       NEXT_P2;
  458:     }
  459: #endif
  460:   }
  461: 
  462:  docon:
  463:   {
  464: #ifdef DEBUG
  465:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  466: #endif
  467: #ifdef USE_TOS
  468:     *sp-- = spTOS;
  469:     spTOS = *(Cell *)PFA1(cfa);
  470: #else
  471:     *--sp = *(Cell *)PFA1(cfa);
  472: #endif
  473:   }
  474:   NEXT_P0;
  475:   NEXT;
  476:   
  477:  dovar:
  478:   {
  479: #ifdef DEBUG
  480:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  481: #endif
  482: #ifdef USE_TOS
  483:     *sp-- = spTOS;
  484:     spTOS = (Cell)PFA1(cfa);
  485: #else
  486:     *--sp = (Cell)PFA1(cfa);
  487: #endif
  488:   }
  489:   NEXT_P0;
  490:   NEXT;
  491:   
  492:  douser:
  493:   {
  494: #ifdef DEBUG
  495:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  496: #endif
  497: #ifdef USE_TOS
  498:     *sp-- = spTOS;
  499:     spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
  500: #else
  501:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  502: #endif
  503:   }
  504:   NEXT_P0;
  505:   NEXT;
  506:   
  507:  dodefer:
  508:   {
  509: #ifdef DEBUG
  510:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  511: #endif
  512:     SUPER_END;
  513:     EXEC(*(Xt *)PFA1(cfa));
  514:   }
  515: 
  516:  dofield:
  517:   {
  518: #ifdef DEBUG
  519:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  520: #endif
  521:     spTOS += *(Cell*)PFA1(cfa);
  522:   }
  523:   NEXT_P0;
  524:   NEXT;
  525: 
  526:  dodoes:
  527:   /* this assumes the following structure:
  528:      defining-word:
  529:      
  530:      ...
  531:      DOES>
  532:      (possible padding)
  533:      possibly handler: jmp dodoes
  534:      (possible branch delay slot(s))
  535:      Forth code after DOES>
  536:      
  537:      defined word:
  538:      
  539:      cfa: address of or jump to handler OR
  540:           address of or jump to dodoes, address of DOES-code
  541:      pfa:
  542:      
  543:      */
  544:   {
  545:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  546: #ifdef DEBUG
  547:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  548:     fflush(stderr);
  549: #endif
  550:     *--rp = (Cell)ip;
  551:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  552: #ifdef USE_TOS
  553:     *sp-- = spTOS;
  554:     spTOS = (Cell)PFA(cfa);
  555: #else
  556:     *--sp = (Cell)PFA(cfa);
  557: #endif
  558:     SET_IP(DOES_CODE1(cfa));
  559:     SUPER_END;
  560:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
  561:   }
  562:   NEXT;
  563: 
  564: #ifndef IN_ENGINE2
  565: #define LABEL(name) I_##name
  566: #else
  567: #define LABEL(name) J_##name: asm(".skip 16"); I_##name
  568: #endif
  569: #include "prim.i"
  570: #undef LABEL
  571:   after_last: return (Label *)0;
  572:   /*needed only to get the length of the last primitive */
  573: }'
  574: )
  575: 
  576: Label *engine enginerest
  577: 
  578: #define IN_ENGINE2
  579: Label *engine2 enginerest
  580: 

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