File:  [gforth] / gforth / engine / engine.c
Revision 1.27: download - view: text, annotated - select for diffs
Sat Feb 24 13:44:39 2001 UTC (19 years, 3 months ago) by anton
Branches: MAIN
CVS tags: HEAD
added C and primitive support for peeophole optimization

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

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