Annotation of gforth/engine/engine.c, revision 1.29

1.1       anton       1: /* Gforth virtual machine (aka inner interpreter)
                      2: 
1.22      anton       3:   Copyright (C) 1995,1996,1997,1998,2000 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
1.23      anton      19:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      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>
1.17      pazsan     41: #include <dirent.h>
1.21      anton      42: #include <sys/resource.h>
1.19      anton      43: #ifdef HAVE_FNMATCH_H
1.18      anton      44: #include <fnmatch.h>
1.19      anton      45: #else
                     46: #include "fnmatch.h"
                     47: #endif
1.4       pazsan     48: #else
                     49: #include "systypes.h"
                     50: #endif
1.1       anton      51: 
                     52: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
                     53: #include <dlfcn.h>
                     54: #endif
1.8       pazsan     55: #if defined(_WIN32)
                     56: #include <windows.h>
                     57: #endif
1.1       anton      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: 
1.4       pazsan     69: struct F83Name {
                     70:   struct F83Name *next;  /* the link field for old hands */
                     71:   char         countetc;
                     72:   char         name[0];
                     73: };
1.1       anton      74: 
                     75: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
1.25      anton      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))
1.1       anton      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: 
1.14      pazsan     95: #ifdef MEMCMP_AS_SUBROUTINE
                     96: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
1.15      anton      97: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
1.14      pazsan     98: #endif
                     99: 
1.9       pazsan    100: #ifdef HAS_FILE
1.1       anton     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:       ;
1.13      anton     152:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
                    153:       return cstr(from+3, size<3?0:size-3,clear);
1.1       anton     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: }
1.9       pazsan    176: #endif
1.21      anton     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: }
1.1       anton     190: 
                    191: #define NEWLINE        '\n'
                    192: 
                    193: #ifndef HAVE_RINT
                    194: #define rint(x)        floor((x)+0.5)
                    195: #endif
                    196: 
1.9       pazsan    197: #ifdef HAS_FILE
1.16      anton     198: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
1.1       anton     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]= {
1.16      anton     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 };
1.9       pazsan    211: #endif
1.1       anton     212: 
1.26      anton     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: 
1.29    ! anton     247: #define vm_Cell2Cell(x)                (x)
        !           248: 
1.1       anton     249: /* if machine.h has not defined explicit registers, define them as implicit */
                    250: #ifndef IPREG
                    251: #define IPREG
                    252: #endif
                    253: #ifndef SPREG
                    254: #define SPREG
                    255: #endif
                    256: #ifndef RPREG
                    257: #define RPREG
                    258: #endif
                    259: #ifndef FPREG
                    260: #define FPREG
                    261: #endif
                    262: #ifndef LPREG
                    263: #define LPREG
                    264: #endif
                    265: #ifndef CFAREG
                    266: #define CFAREG
                    267: #endif
                    268: #ifndef UPREG
                    269: #define UPREG
                    270: #endif
                    271: #ifndef TOSREG
                    272: #define TOSREG
                    273: #endif
                    274: #ifndef FTOSREG
                    275: #define FTOSREG
                    276: #endif
                    277: 
                    278: #ifndef CPU_DEP1
                    279: # define CPU_DEP1 0
                    280: #endif
                    281: 
                    282: /* declare and compute cfa for certain threading variants */
                    283: /* warning: this is nonsyntactical; it will not work in place of a statement */
1.12      anton     284: #ifndef GETCFA
1.1       anton     285: #define DOCFA
                    286: #else
                    287: #define DOCFA  Xt cfa; GETCFA(cfa)
                    288: #endif
                    289: 
1.28      anton     290: /* instructions containing these must be the last instruction of a
                    291:    super-instruction (e.g., branches, EXECUTE, and other instructions
                    292:    ending the basic block). Instructions containing SET_IP get this
                    293:    automatically, so you usually don't have to write it.  If you have
                    294:    to write it, write it after IP points to the next instruction.
                    295:    Used for profiling.  Don't write it in a word containing SET_IP, or
                    296:    the following block will be counted twice. */
                    297: #ifdef VM_PROFILING
                    298: #define SUPER_END  vm_count_block(IP)
                    299: #else
                    300: #define SUPER_END
                    301: #endif
                    302: 
1.10      anton     303: #ifdef GFORTH_DEBUGGING
                    304: /* define some VM registers as global variables, so they survive exceptions;
                    305:    global register variables are not up to the task (according to the 
                    306:    GNU C manual) */
                    307: Xt *ip;
                    308: Cell *rp;
                    309: #endif
                    310: 
1.1       anton     311: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
                    312: /* executes code at ip, if ip!=NULL
                    313:    returns array of machine code labels (for use in a loader), if ip==NULL
                    314: */
                    315: {
1.10      anton     316: #ifndef GFORTH_DEBUGGING
                    317:   register Xt *ip IPREG;
                    318:   register Cell *rp RPREG;
                    319: #endif
1.1       anton     320:   register Cell *sp SPREG = sp0;
                    321:   register Float *fp FPREG = fp0;
                    322:   register Address lp LPREG = lp0;
                    323: #ifdef CFA_NEXT
                    324:   register Xt cfa CFAREG;
                    325: #endif
1.11      anton     326: #ifdef MORE_VARS
                    327:   MORE_VARS
                    328: #endif
1.1       anton     329:   register Address up UPREG = UP;
1.24      anton     330:   IF_spTOS(register Cell spTOS TOSREG;)
                    331:   IF_fpTOS(register Float fpTOS FTOSREG;)
1.1       anton     332: #if defined(DOUBLY_INDIRECT)
                    333:   static Label *symbols;
                    334:   static void *routines[]= {
1.27      anton     335: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
1.1       anton     336: #else /* !defined(DOUBLY_INDIRECT) */
                    337:   static Label symbols[]= {
1.27      anton     338: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
1.1       anton     339: #endif /* !defined(DOUBLY_INDIRECT) */
1.4       pazsan    340:     (Label)&&docol,
                    341:     (Label)&&docon,
                    342:     (Label)&&dovar,
                    343:     (Label)&&douser,
                    344:     (Label)&&dodefer,
                    345:     (Label)&&dofield,
                    346:     (Label)&&dodoes,
1.1       anton     347:     /* the following entry is normally unused;
                    348:        it's there because its index indicates a does-handler */
1.7       pazsan    349:     CPU_DEP1,
1.1       anton     350: #include "prim_lab.i"
1.4       pazsan    351:     (Label)0
1.1       anton     352:   };
                    353: #ifdef CPU_DEP2
                    354:   CPU_DEP2
                    355: #endif
                    356: 
1.10      anton     357:   ip = ip0;
                    358:   rp = rp0;
1.1       anton     359: #ifdef DEBUG
                    360:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
                    361:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    362:          (unsigned)fp,(unsigned)lp,(unsigned)up);
                    363: #endif
                    364: 
                    365:   if (ip == NULL) {
                    366: #if defined(DOUBLY_INDIRECT)
1.3       anton     367: #define CODE_OFFSET (22*sizeof(Cell))
1.1       anton     368:     int i;
1.3       anton     369:     Cell code_offset = offset_image? CODE_OFFSET : 0;
1.7       pazsan    370: 
1.3       anton     371:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1       anton     372:     for (i=0; i<DOESJUMP+1; i++)
1.7       pazsan    373:       symbols[i] = (Label)routines[i];
1.1       anton     374:     for (; routines[i]!=0; i++) {
                    375:       if (i>=MAX_SYMBOLS) {
                    376:        fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
                    377:        exit(1);
1.20      anton     378:       }
                    379:       symbols[i] = &routines[i];
1.1       anton     380:     }
1.20      anton     381: #endif /* defined(DOUBLY_INDIRECT) */
                    382:     return symbols;
1.7       pazsan    383:   }
1.1       anton     384: 
1.24      anton     385:   IF_spTOS(spTOS = sp[0]);
                    386:   IF_fpTOS(fpTOS = fp[0]);
1.7       pazsan    387: /*  prep_terminal(); */
1.11      anton     388:   SET_IP(ip);
1.28      anton     389:   SUPER_END; /* count the first block, too */
1.1       anton     390:   NEXT;
                    391: 
1.11      anton     392: 
1.1       anton     393: #ifdef CPU_DEP3
                    394:   CPU_DEP3
                    395: #endif
                    396:   
                    397:  docol:
                    398:   {
                    399:     DOCFA;
                    400: #ifdef DEBUG
                    401:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    402: #endif
                    403: #ifdef CISC_NEXT
                    404:     /* this is the simple version */
                    405:     *--rp = (Cell)ip;
1.11      anton     406:     SET_IP((Xt *)PFA1(cfa));
1.28      anton     407:     SUPER_END;
1.1       anton     408:     NEXT;
                    409: #else
1.11      anton     410:     /* this one is important, so we help the compiler optimizing */
1.1       anton     411:     {
                    412:       DEF_CA
1.11      anton     413:       rp[-1] = (Cell)ip;
                    414:       SET_IP((Xt *)PFA1(cfa));
1.28      anton     415:       SUPER_END;
1.11      anton     416:       NEXT_P1;
                    417:       rp--;
                    418:       NEXT_P2;
1.1       anton     419:     }
                    420: #endif
                    421:   }
                    422: 
                    423:  docon:
                    424:   {
                    425:     DOCFA;
                    426: #ifdef DEBUG
                    427:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    428: #endif
                    429: #ifdef USE_TOS
1.24      anton     430:     *sp-- = spTOS;
                    431:     spTOS = *(Cell *)PFA1(cfa);
1.1       anton     432: #else
                    433:     *--sp = *(Cell *)PFA1(cfa);
                    434: #endif
                    435:   }
                    436:   NEXT_P0;
                    437:   NEXT;
                    438:   
                    439:  dovar:
                    440:   {
                    441:     DOCFA;
                    442: #ifdef DEBUG
                    443:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    444: #endif
                    445: #ifdef USE_TOS
1.24      anton     446:     *sp-- = spTOS;
                    447:     spTOS = (Cell)PFA1(cfa);
1.1       anton     448: #else
                    449:     *--sp = (Cell)PFA1(cfa);
                    450: #endif
                    451:   }
                    452:   NEXT_P0;
                    453:   NEXT;
                    454:   
                    455:  douser:
                    456:   {
                    457:     DOCFA;
                    458: #ifdef DEBUG
                    459:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    460: #endif
                    461: #ifdef USE_TOS
1.24      anton     462:     *sp-- = spTOS;
                    463:     spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
1.1       anton     464: #else
                    465:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
                    466: #endif
                    467:   }
                    468:   NEXT_P0;
                    469:   NEXT;
                    470:   
                    471:  dodefer:
                    472:   {
                    473:     DOCFA;
                    474: #ifdef DEBUG
                    475:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    476: #endif
1.28      anton     477:     SUPER_END;
1.1       anton     478:     EXEC(*(Xt *)PFA1(cfa));
                    479:   }
                    480: 
                    481:  dofield:
                    482:   {
                    483:     DOCFA;
                    484: #ifdef DEBUG
                    485:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    486: #endif
1.24      anton     487:     spTOS += *(Cell*)PFA1(cfa);
1.1       anton     488:   }
                    489:   NEXT_P0;
                    490:   NEXT;
                    491: 
                    492:  dodoes:
                    493:   /* this assumes the following structure:
                    494:      defining-word:
                    495:      
                    496:      ...
                    497:      DOES>
                    498:      (possible padding)
                    499:      possibly handler: jmp dodoes
                    500:      (possible branch delay slot(s))
                    501:      Forth code after DOES>
                    502:      
                    503:      defined word:
                    504:      
                    505:      cfa: address of or jump to handler OR
                    506:           address of or jump to dodoes, address of DOES-code
                    507:      pfa:
                    508:      
                    509:      */
                    510:   {
                    511:     DOCFA;
                    512: 
                    513:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
                    514: #ifdef DEBUG
                    515:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    516:     fflush(stderr);
                    517: #endif
                    518:     *--rp = (Cell)ip;
                    519:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    520: #ifdef USE_TOS
1.24      anton     521:     *sp-- = spTOS;
                    522:     spTOS = (Cell)PFA(cfa);
1.1       anton     523: #else
                    524:     *--sp = (Cell)PFA(cfa);
                    525: #endif
1.11      anton     526:     SET_IP(DOES_CODE1(cfa));
1.28      anton     527:     SUPER_END;
1.24      anton     528:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
1.1       anton     529:   }
                    530:   NEXT;
                    531: 
                    532: #include "prim.i"
                    533: }

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