File:  [gforth] / gforth / Attic / engine.c
Revision 1.41: download - view: text, annotated - select for diffs
Tue Mar 4 17:49:48 1997 UTC (24 years, 6 months ago) by anton
Branches: MAIN
CVS tags: v0-3-0, HEAD
added double indirect threaded version and making of fully relocatable images.
added gforth-makeimage script for making fully relocatable images.
removed locals bug in if else endif constructs.
added mmap support for machines without MAP_ANON
removed command-line options -c and -o
moved definition of DOES_HANDLER_SIZE from machine.h to forth.h.
added hpux FLUSH_ICACHE in m68k.h
made source words print decimal

    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: Address UP=NULL;
   62: 
   63: #if 0
   64: /* not used currently */
   65: int emitcounter;
   66: #endif
   67: #define NULLC '\0'
   68: 
   69: char *cstr(Char *from, UCell size, int clear)
   70: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
   71:    the C-string lives until the next call of cstr with CLEAR being true */
   72: {
   73:   static struct cstr_buffer {
   74:     char *buffer;
   75:     size_t size;
   76:   } *buffers=NULL;
   77:   static int nbuffers=0;
   78:   static int used=0;
   79:   struct cstr_buffer *b;
   80: 
   81:   if (buffers==NULL)
   82:     buffers=malloc(0);
   83:   if (clear)
   84:     used=0;
   85:   if (used>=nbuffers) {
   86:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
   87:     buffers[used]=(struct cstr_buffer){malloc(0),0};
   88:     nbuffers=used+1;
   89:   }
   90:   b=&buffers[used];
   91:   if (size+1 > b->size) {
   92:     b->buffer = realloc(b->buffer,size+1);
   93:     b->size = size+1;
   94:   }
   95:   memcpy(b->buffer,from,size);
   96:   b->buffer[size]='\0';
   97:   used++;
   98:   return b->buffer;
   99: }
  100: 
  101: char *tilde_cstr(Char *from, UCell size, int clear)
  102: /* like cstr(), but perform tilde expansion on the string */
  103: {
  104:   char *s1,*s2;
  105:   int s1_len, s2_len;
  106:   struct passwd *getpwnam (), *user_entry;
  107: 
  108:   if (size<1 || from[0]!='~')
  109:     return cstr(from, size, clear);
  110:   if (size<2 || from[1]=='/') {
  111:     s1 = (char *)getenv ("HOME");
  112:     if(s1 == NULL)
  113:       s1 = "";
  114:     s2 = from+1;
  115:     s2_len = size-1;
  116:   } else {
  117:     UCell i;
  118:     for (i=1; i<size && from[i]!='/'; i++)
  119:       ;
  120:     {
  121:       char user[i];
  122:       memcpy(user,from+1,i-1);
  123:       user[i-1]='\0';
  124:       user_entry=getpwnam(user);
  125:     }
  126:     if (user_entry==NULL)
  127:       return cstr(from, size, clear);
  128:     s1 = user_entry->pw_dir;
  129:     s2 = from+i;
  130:     s2_len = size-i;
  131:   }
  132:   s1_len = strlen(s1);
  133:   if (s1_len>1 && s1[s1_len-1]=='/')
  134:     s1_len--;
  135:   {
  136:     char path[s1_len+s2_len];
  137:     memcpy(path,s1,s1_len);
  138:     memcpy(path+s1_len,s2,s2_len);
  139:     return cstr(path,s1_len+s2_len,clear);
  140:   }
  141: }
  142:    
  143: 
  144: #define NEWLINE	'\n'
  145: 
  146: #ifndef HAVE_RINT
  147: #define rint(x)	floor((x)+0.5)
  148: #endif
  149: 
  150: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
  151: 
  152: #ifndef O_BINARY
  153: #define O_BINARY 0
  154: #endif
  155: #ifndef O_TEXT
  156: #define O_TEXT 0
  157: #endif
  158: 
  159: static int ufileattr[6]= {
  160:   O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
  161:   O_RDWR  |O_TEXT, O_RDWR  |O_BINARY,
  162:   O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
  163: 
  164: /* if machine.h has not defined explicit registers, define them as implicit */
  165: #ifndef IPREG
  166: #define IPREG
  167: #endif
  168: #ifndef SPREG
  169: #define SPREG
  170: #endif
  171: #ifndef RPREG
  172: #define RPREG
  173: #endif
  174: #ifndef FPREG
  175: #define FPREG
  176: #endif
  177: #ifndef LPREG
  178: #define LPREG
  179: #endif
  180: #ifndef CFAREG
  181: #define CFAREG
  182: #endif
  183: #ifndef UPREG
  184: #define UPREG
  185: #endif
  186: #ifndef TOSREG
  187: #define TOSREG
  188: #endif
  189: #ifndef FTOSREG
  190: #define FTOSREG
  191: #endif
  192: 
  193: #ifndef CPU_DEP1
  194: # define CPU_DEP1 0
  195: #endif
  196: 
  197: /* declare and compute cfa for certain threading variants */
  198: /* warning: this is nonsyntactical; it will not work in place of a statement */
  199: #ifdef CFA_NEXT
  200: #define DOCFA
  201: #else
  202: #define DOCFA	Xt cfa; GETCFA(cfa)
  203: #endif
  204: 
  205: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  206: /* executes code at ip, if ip!=NULL
  207:    returns array of machine code labels (for use in a loader), if ip==NULL
  208: */
  209: {
  210:   register Xt *ip IPREG = ip0;
  211:   register Cell *sp SPREG = sp0;
  212:   register Cell *rp RPREG = rp0;
  213:   register Float *fp FPREG = fp0;
  214:   register Address lp LPREG = lp0;
  215: #ifdef CFA_NEXT
  216:   register Xt cfa CFAREG;
  217: #endif
  218:   register Address up UPREG = UP;
  219:   IF_TOS(register Cell TOS TOSREG;)
  220:   IF_FTOS(register Float FTOS FTOSREG;)
  221: #if defined(DOUBLY_INDIRECT)
  222:   static Label *symbols;
  223:   static void *routines[]= {
  224: #else /* !defined(DOUBLY_INDIRECT) */
  225:   static Label symbols[]= {
  226: #endif /* !defined(DOUBLY_INDIRECT) */
  227:     &&docol,
  228:     &&docon,
  229:     &&dovar,
  230:     &&douser,
  231:     &&dodefer,
  232:     &&dofield,
  233:     &&dodoes,
  234:     /* the following entry is normally unused;
  235:        it's there because its index indicates a does-handler */
  236:     CPU_DEP1,
  237: #include "prim_labels.i"
  238:     0
  239:   };
  240: #ifdef CPU_DEP2
  241:   CPU_DEP2
  242: #endif
  243: 
  244: #ifdef DEBUG
  245:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  246:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
  247: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  248: #endif
  249: 
  250:   if (ip == NULL) {
  251: #if defined(DOUBLY_INDIRECT)
  252: #define MAX_SYMBOLS 1000
  253:     int i;
  254:     Cell code_offset = offset_image? 11*sizeof(Cell) : 0;
  255: 
  256:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+code_offset)+code_offset);
  257:     for (i=0; i<DOESJUMP+1; i++)
  258:       symbols[i] = (Label)routines[i];
  259:     for (; routines[i]!=0; i++) {
  260:       if (i>=MAX_SYMBOLS) {
  261: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  262: 	exit(1);
  263:     }
  264:     symbols[i] = &routines[i];
  265:   }
  266: #endif /* defined(DOUBLY_INDIRECT) */
  267:   return symbols;
  268: }
  269: 
  270:   IF_TOS(TOS = sp[0]);
  271:   IF_FTOS(FTOS = fp[0]);
  272: /*  prep_terminal(); */
  273:   NEXT_P0;
  274:   NEXT;
  275: 
  276: #ifdef CPU_DEP3
  277:   CPU_DEP3
  278: #endif
  279:   
  280:  docol:
  281:   {
  282:     DOCFA;
  283: #ifdef DEBUG
  284:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  285: #endif
  286: #ifdef CISC_NEXT
  287:     /* this is the simple version */
  288:     *--rp = (Cell)ip;
  289:     ip = (Xt *)PFA1(cfa);
  290:     NEXT_P0;
  291:     NEXT;
  292: #else
  293:     /* this one is important, so we help the compiler optimizing
  294:        The following version may be better (for scheduling), but probably has
  295:        problems with code fields employing calls and delay slots
  296:        */
  297:     {
  298:       DEF_CA
  299:       Xt *current_ip = (Xt *)PFA1(cfa);
  300:       cfa = *current_ip;
  301:       NEXT1_P1;
  302:       *--rp = (Cell)ip;
  303:       ip = current_ip+1;
  304:       NEXT1_P2;
  305:     }
  306: #endif
  307:   }
  308: 
  309:  docon:
  310:   {
  311:     DOCFA;
  312: #ifdef DEBUG
  313:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  314: #endif
  315: #ifdef USE_TOS
  316:     *sp-- = TOS;
  317:     TOS = *(Cell *)PFA1(cfa);
  318: #else
  319:     *--sp = *(Cell *)PFA1(cfa);
  320: #endif
  321:   }
  322:   NEXT_P0;
  323:   NEXT;
  324:   
  325:  dovar:
  326:   {
  327:     DOCFA;
  328: #ifdef DEBUG
  329:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  330: #endif
  331: #ifdef USE_TOS
  332:     *sp-- = TOS;
  333:     TOS = (Cell)PFA1(cfa);
  334: #else
  335:     *--sp = (Cell)PFA1(cfa);
  336: #endif
  337:   }
  338:   NEXT_P0;
  339:   NEXT;
  340:   
  341:  douser:
  342:   {
  343:     DOCFA;
  344: #ifdef DEBUG
  345:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  346: #endif
  347: #ifdef USE_TOS
  348:     *sp-- = TOS;
  349:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  350: #else
  351:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  352: #endif
  353:   }
  354:   NEXT_P0;
  355:   NEXT;
  356:   
  357:  dodefer:
  358:   {
  359:     DOCFA;
  360: #ifdef DEBUG
  361:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  362: #endif
  363:     EXEC(*(Xt *)PFA1(cfa));
  364:   }
  365: 
  366:  dofield:
  367:   {
  368:     DOCFA;
  369: #ifdef DEBUG
  370:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  371: #endif
  372:     TOS += *(Cell*)PFA1(cfa); 
  373:   }
  374:   NEXT_P0;
  375:   NEXT;
  376: 
  377:  dodoes:
  378:   /* this assumes the following structure:
  379:      defining-word:
  380:      
  381:      ...
  382:      DOES>
  383:      (possible padding)
  384:      possibly handler: jmp dodoes
  385:      (possible branch delay slot(s))
  386:      Forth code after DOES>
  387:      
  388:      defined word:
  389:      
  390:      cfa: address of or jump to handler OR
  391:           address of or jump to dodoes, address of DOES-code
  392:      pfa:
  393:      
  394:      */
  395:   {
  396:     DOCFA;
  397: 
  398:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  399: #ifdef DEBUG
  400:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  401:     fflush(stderr);
  402: #endif
  403:     *--rp = (Cell)ip;
  404:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  405:     ip = DOES_CODE1(cfa);
  406: #ifdef USE_TOS
  407:     *sp-- = TOS;
  408:     TOS = (Cell)PFA(cfa);
  409: #else
  410:     *--sp = (Cell)PFA(cfa);
  411: #endif
  412:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
  413:   }
  414:   NEXT_P0;
  415:   NEXT;
  416: 
  417: #include "primitives.i"
  418: }

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