Annotation of gforth/engine/engine.c, revision 1.16

1.1       anton       1: /* Gforth virtual machine (aka inner interpreter)
                      2: 
1.6       anton       3:   Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
1.1       anton       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>
1.4       pazsan     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
1.1       anton      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>
1.4       pazsan     41: #else
                     42: #include "systypes.h"
                     43: #endif
1.1       anton      44: 
                     45: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
                     46: #include <dlfcn.h>
                     47: #endif
1.8       pazsan     48: #if defined(_WIN32)
                     49: #include <windows.h>
                     50: #endif
1.1       anton      51: #ifdef hpux
                     52: #include <dl.h>
                     53: #endif
                     54: 
                     55: #ifndef SEEK_SET
                     56: /* should be defined in stdio.h, but some systems don't have it */
                     57: #define SEEK_SET 0
                     58: #endif
                     59: 
                     60: #define IOR(flag)      ((flag)? -512-errno : 0)
                     61: 
1.4       pazsan     62: struct F83Name {
                     63:   struct F83Name *next;  /* the link field for old hands */
                     64:   char         countetc;
                     65:   char         name[0];
                     66: };
1.1       anton      67: 
                     68: /* are macros for setting necessary? */
                     69: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
                     70: #define F83NAME_SMUDGE(np)     (((np)->countetc & 0x40) != 0)
                     71: #define F83NAME_IMMEDIATE(np)  (((np)->countetc & 0x20) != 0)
                     72: 
                     73: Cell *SP;
                     74: Float *FP;
                     75: Address UP=NULL;
                     76: 
                     77: #if 0
                     78: /* not used currently */
                     79: int emitcounter;
                     80: #endif
                     81: #define NULLC '\0'
                     82: 
1.14      pazsan     83: #ifdef MEMCMP_AS_SUBROUTINE
                     84: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
1.15      anton      85: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
1.14      pazsan     86: #endif
                     87: 
1.9       pazsan     88: #ifdef HAS_FILE
1.1       anton      89: char *cstr(Char *from, UCell size, int clear)
                     90: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
                     91:    the C-string lives until the next call of cstr with CLEAR being true */
                     92: {
                     93:   static struct cstr_buffer {
                     94:     char *buffer;
                     95:     size_t size;
                     96:   } *buffers=NULL;
                     97:   static int nbuffers=0;
                     98:   static int used=0;
                     99:   struct cstr_buffer *b;
                    100: 
                    101:   if (buffers==NULL)
                    102:     buffers=malloc(0);
                    103:   if (clear)
                    104:     used=0;
                    105:   if (used>=nbuffers) {
                    106:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
                    107:     buffers[used]=(struct cstr_buffer){malloc(0),0};
                    108:     nbuffers=used+1;
                    109:   }
                    110:   b=&buffers[used];
                    111:   if (size+1 > b->size) {
                    112:     b->buffer = realloc(b->buffer,size+1);
                    113:     b->size = size+1;
                    114:   }
                    115:   memcpy(b->buffer,from,size);
                    116:   b->buffer[size]='\0';
                    117:   used++;
                    118:   return b->buffer;
                    119: }
                    120: 
                    121: char *tilde_cstr(Char *from, UCell size, int clear)
                    122: /* like cstr(), but perform tilde expansion on the string */
                    123: {
                    124:   char *s1,*s2;
                    125:   int s1_len, s2_len;
                    126:   struct passwd *getpwnam (), *user_entry;
                    127: 
                    128:   if (size<1 || from[0]!='~')
                    129:     return cstr(from, size, clear);
                    130:   if (size<2 || from[1]=='/') {
                    131:     s1 = (char *)getenv ("HOME");
                    132:     if(s1 == NULL)
                    133:       s1 = "";
                    134:     s2 = from+1;
                    135:     s2_len = size-1;
                    136:   } else {
                    137:     UCell i;
                    138:     for (i=1; i<size && from[i]!='/'; i++)
                    139:       ;
1.13      anton     140:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
                    141:       return cstr(from+3, size<3?0:size-3,clear);
1.1       anton     142:     {
                    143:       char user[i];
                    144:       memcpy(user,from+1,i-1);
                    145:       user[i-1]='\0';
                    146:       user_entry=getpwnam(user);
                    147:     }
                    148:     if (user_entry==NULL)
                    149:       return cstr(from, size, clear);
                    150:     s1 = user_entry->pw_dir;
                    151:     s2 = from+i;
                    152:     s2_len = size-i;
                    153:   }
                    154:   s1_len = strlen(s1);
                    155:   if (s1_len>1 && s1[s1_len-1]=='/')
                    156:     s1_len--;
                    157:   {
                    158:     char path[s1_len+s2_len];
                    159:     memcpy(path,s1,s1_len);
                    160:     memcpy(path+s1_len,s2,s2_len);
                    161:     return cstr(path,s1_len+s2_len,clear);
                    162:   }
                    163: }
1.9       pazsan    164: #endif
1.1       anton     165: 
                    166: #define NEWLINE        '\n'
                    167: 
                    168: #ifndef HAVE_RINT
                    169: #define rint(x)        floor((x)+0.5)
                    170: #endif
                    171: 
1.9       pazsan    172: #ifdef HAS_FILE
1.16    ! anton     173: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
1.1       anton     174: 
                    175: #ifndef O_BINARY
                    176: #define O_BINARY 0
                    177: #endif
                    178: #ifndef O_TEXT
                    179: #define O_TEXT 0
                    180: #endif
                    181: 
                    182: static int ufileattr[6]= {
1.16    ! anton     183:   O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
        !           184:   O_RDWR  |O_BINARY, O_RDWR  |O_BINARY,
        !           185:   O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
1.9       pazsan    186: #endif
1.1       anton     187: 
                    188: /* if machine.h has not defined explicit registers, define them as implicit */
                    189: #ifndef IPREG
                    190: #define IPREG
                    191: #endif
                    192: #ifndef SPREG
                    193: #define SPREG
                    194: #endif
                    195: #ifndef RPREG
                    196: #define RPREG
                    197: #endif
                    198: #ifndef FPREG
                    199: #define FPREG
                    200: #endif
                    201: #ifndef LPREG
                    202: #define LPREG
                    203: #endif
                    204: #ifndef CFAREG
                    205: #define CFAREG
                    206: #endif
                    207: #ifndef UPREG
                    208: #define UPREG
                    209: #endif
                    210: #ifndef TOSREG
                    211: #define TOSREG
                    212: #endif
                    213: #ifndef FTOSREG
                    214: #define FTOSREG
                    215: #endif
                    216: 
                    217: #ifndef CPU_DEP1
                    218: # define CPU_DEP1 0
                    219: #endif
                    220: 
                    221: /* declare and compute cfa for certain threading variants */
                    222: /* warning: this is nonsyntactical; it will not work in place of a statement */
1.12      anton     223: #ifndef GETCFA
1.1       anton     224: #define DOCFA
                    225: #else
                    226: #define DOCFA  Xt cfa; GETCFA(cfa)
                    227: #endif
                    228: 
1.10      anton     229: #ifdef GFORTH_DEBUGGING
                    230: /* define some VM registers as global variables, so they survive exceptions;
                    231:    global register variables are not up to the task (according to the 
                    232:    GNU C manual) */
                    233: Xt *ip;
                    234: Cell *rp;
                    235: #endif
                    236: 
1.1       anton     237: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
                    238: /* executes code at ip, if ip!=NULL
                    239:    returns array of machine code labels (for use in a loader), if ip==NULL
                    240: */
                    241: {
1.10      anton     242: #ifndef GFORTH_DEBUGGING
                    243:   register Xt *ip IPREG;
                    244:   register Cell *rp RPREG;
                    245: #endif
1.1       anton     246:   register Cell *sp SPREG = sp0;
                    247:   register Float *fp FPREG = fp0;
                    248:   register Address lp LPREG = lp0;
                    249: #ifdef CFA_NEXT
                    250:   register Xt cfa CFAREG;
                    251: #endif
1.11      anton     252: #ifdef MORE_VARS
                    253:   MORE_VARS
                    254: #endif
1.1       anton     255:   register Address up UPREG = UP;
                    256:   IF_TOS(register Cell TOS TOSREG;)
                    257:   IF_FTOS(register Float FTOS FTOSREG;)
                    258: #if defined(DOUBLY_INDIRECT)
                    259:   static Label *symbols;
                    260:   static void *routines[]= {
                    261: #else /* !defined(DOUBLY_INDIRECT) */
                    262:   static Label symbols[]= {
                    263: #endif /* !defined(DOUBLY_INDIRECT) */
1.4       pazsan    264:     (Label)&&docol,
                    265:     (Label)&&docon,
                    266:     (Label)&&dovar,
                    267:     (Label)&&douser,
                    268:     (Label)&&dodefer,
                    269:     (Label)&&dofield,
                    270:     (Label)&&dodoes,
1.1       anton     271:     /* the following entry is normally unused;
                    272:        it's there because its index indicates a does-handler */
1.7       pazsan    273:     CPU_DEP1,
1.1       anton     274: #include "prim_lab.i"
1.4       pazsan    275:     (Label)0
1.1       anton     276:   };
                    277: #ifdef CPU_DEP2
                    278:   CPU_DEP2
                    279: #endif
                    280: 
1.10      anton     281:   ip = ip0;
                    282:   rp = rp0;
1.1       anton     283: #ifdef DEBUG
                    284:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
                    285:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    286:          (unsigned)fp,(unsigned)lp,(unsigned)up);
                    287: #endif
                    288: 
                    289:   if (ip == NULL) {
                    290: #if defined(DOUBLY_INDIRECT)
1.3       anton     291: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
                    292: #define CODE_OFFSET (22*sizeof(Cell))
1.1       anton     293:     int i;
1.3       anton     294:     Cell code_offset = offset_image? CODE_OFFSET : 0;
1.7       pazsan    295: 
1.3       anton     296:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1       anton     297:     for (i=0; i<DOESJUMP+1; i++)
1.7       pazsan    298:       symbols[i] = (Label)routines[i];
1.1       anton     299:     for (; routines[i]!=0; i++) {
                    300:       if (i>=MAX_SYMBOLS) {
                    301:        fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
                    302:        exit(1);
                    303:     }
1.7       pazsan    304:     symbols[i] = &routines[i];
                    305:   }
1.5       pazsan    306: #endif /* defined(DOUBLY_INDIRECT) */
1.7       pazsan    307:   return symbols;
                    308: }
1.1       anton     309: 
                    310:   IF_TOS(TOS = sp[0]);
                    311:   IF_FTOS(FTOS = fp[0]);
1.7       pazsan    312: /*  prep_terminal(); */
1.11      anton     313:   SET_IP(ip);
1.1       anton     314:   NEXT;
                    315: 
1.11      anton     316: 
1.1       anton     317: #ifdef CPU_DEP3
                    318:   CPU_DEP3
                    319: #endif
                    320:   
                    321:  docol:
                    322:   {
                    323:     DOCFA;
                    324: #ifdef DEBUG
                    325:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    326: #endif
                    327: #ifdef CISC_NEXT
                    328:     /* this is the simple version */
                    329:     *--rp = (Cell)ip;
1.11      anton     330:     SET_IP((Xt *)PFA1(cfa));
1.1       anton     331:     NEXT;
                    332: #else
1.11      anton     333:     /* this one is important, so we help the compiler optimizing */
1.1       anton     334:     {
                    335:       DEF_CA
1.11      anton     336:       rp[-1] = (Cell)ip;
                    337:       SET_IP((Xt *)PFA1(cfa));
                    338:       NEXT_P1;
                    339:       rp--;
                    340:       NEXT_P2;
1.1       anton     341:     }
                    342: #endif
                    343:   }
                    344: 
                    345:  docon:
                    346:   {
                    347:     DOCFA;
                    348: #ifdef DEBUG
                    349:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    350: #endif
                    351: #ifdef USE_TOS
                    352:     *sp-- = TOS;
                    353:     TOS = *(Cell *)PFA1(cfa);
                    354: #else
                    355:     *--sp = *(Cell *)PFA1(cfa);
                    356: #endif
                    357:   }
                    358:   NEXT_P0;
                    359:   NEXT;
                    360:   
                    361:  dovar:
                    362:   {
                    363:     DOCFA;
                    364: #ifdef DEBUG
                    365:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    366: #endif
                    367: #ifdef USE_TOS
                    368:     *sp-- = TOS;
                    369:     TOS = (Cell)PFA1(cfa);
                    370: #else
                    371:     *--sp = (Cell)PFA1(cfa);
                    372: #endif
                    373:   }
                    374:   NEXT_P0;
                    375:   NEXT;
                    376:   
                    377:  douser:
                    378:   {
                    379:     DOCFA;
                    380: #ifdef DEBUG
                    381:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    382: #endif
                    383: #ifdef USE_TOS
                    384:     *sp-- = TOS;
                    385:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
                    386: #else
                    387:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
                    388: #endif
                    389:   }
                    390:   NEXT_P0;
                    391:   NEXT;
                    392:   
                    393:  dodefer:
                    394:   {
                    395:     DOCFA;
                    396: #ifdef DEBUG
                    397:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    398: #endif
                    399:     EXEC(*(Xt *)PFA1(cfa));
                    400:   }
                    401: 
                    402:  dofield:
                    403:   {
                    404:     DOCFA;
                    405: #ifdef DEBUG
                    406:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    407: #endif
1.11      anton     408:     TOS += *(Cell*)PFA1(cfa);
1.1       anton     409:   }
                    410:   NEXT_P0;
                    411:   NEXT;
                    412: 
                    413:  dodoes:
                    414:   /* this assumes the following structure:
                    415:      defining-word:
                    416:      
                    417:      ...
                    418:      DOES>
                    419:      (possible padding)
                    420:      possibly handler: jmp dodoes
                    421:      (possible branch delay slot(s))
                    422:      Forth code after DOES>
                    423:      
                    424:      defined word:
                    425:      
                    426:      cfa: address of or jump to handler OR
                    427:           address of or jump to dodoes, address of DOES-code
                    428:      pfa:
                    429:      
                    430:      */
                    431:   {
                    432:     DOCFA;
                    433: 
                    434:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
                    435: #ifdef DEBUG
                    436:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    437:     fflush(stderr);
                    438: #endif
                    439:     *--rp = (Cell)ip;
                    440:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    441: #ifdef USE_TOS
                    442:     *sp-- = TOS;
                    443:     TOS = (Cell)PFA(cfa);
                    444: #else
                    445:     *--sp = (Cell)PFA(cfa);
                    446: #endif
1.11      anton     447:     SET_IP(DOES_CODE1(cfa));
1.1       anton     448:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
                    449:   }
                    450:   NEXT;
                    451: 
                    452: #include "prim.i"
                    453: }

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