Annotation of gforth/engine/engine.c, revision 1.6

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
                     48: #ifdef hpux
                     49: #include <dl.h>
                     50: #endif
                     51: 
                     52: #ifndef SEEK_SET
                     53: /* should be defined in stdio.h, but some systems don't have it */
                     54: #define SEEK_SET 0
                     55: #endif
                     56: 
                     57: #define IOR(flag)      ((flag)? -512-errno : 0)
                     58: 
1.4       pazsan     59: struct F83Name {
                     60:   struct F83Name *next;  /* the link field for old hands */
                     61:   char         countetc;
                     62:   char         name[0];
                     63: };
1.1       anton      64: 
                     65: /* are macros for setting necessary? */
                     66: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
                     67: #define F83NAME_SMUDGE(np)     (((np)->countetc & 0x40) != 0)
                     68: #define F83NAME_IMMEDIATE(np)  (((np)->countetc & 0x20) != 0)
                     69: 
                     70: Cell *SP;
                     71: Float *FP;
                     72: Address UP=NULL;
                     73: 
                     74: #if 0
                     75: /* not used currently */
                     76: int emitcounter;
                     77: #endif
                     78: #define NULLC '\0'
                     79: 
                     80: char *cstr(Char *from, UCell size, int clear)
                     81: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
                     82:    the C-string lives until the next call of cstr with CLEAR being true */
                     83: {
                     84:   static struct cstr_buffer {
                     85:     char *buffer;
                     86:     size_t size;
                     87:   } *buffers=NULL;
                     88:   static int nbuffers=0;
                     89:   static int used=0;
                     90:   struct cstr_buffer *b;
                     91: 
                     92:   if (buffers==NULL)
                     93:     buffers=malloc(0);
                     94:   if (clear)
                     95:     used=0;
                     96:   if (used>=nbuffers) {
                     97:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
                     98:     buffers[used]=(struct cstr_buffer){malloc(0),0};
                     99:     nbuffers=used+1;
                    100:   }
                    101:   b=&buffers[used];
                    102:   if (size+1 > b->size) {
                    103:     b->buffer = realloc(b->buffer,size+1);
                    104:     b->size = size+1;
                    105:   }
                    106:   memcpy(b->buffer,from,size);
                    107:   b->buffer[size]='\0';
                    108:   used++;
                    109:   return b->buffer;
                    110: }
                    111: 
1.4       pazsan    112: #ifdef STANDALONE
                    113: char *tilde_cstr(Char *from, UCell size, int clear)
                    114: {
                    115:   return cstr(from, size, clear);
                    116: }
                    117: #else
1.1       anton     118: char *tilde_cstr(Char *from, UCell size, int clear)
                    119: /* like cstr(), but perform tilde expansion on the string */
                    120: {
                    121:   char *s1,*s2;
                    122:   int s1_len, s2_len;
                    123:   struct passwd *getpwnam (), *user_entry;
                    124: 
                    125:   if (size<1 || from[0]!='~')
                    126:     return cstr(from, size, clear);
                    127:   if (size<2 || from[1]=='/') {
                    128:     s1 = (char *)getenv ("HOME");
                    129:     if(s1 == NULL)
                    130:       s1 = "";
                    131:     s2 = from+1;
                    132:     s2_len = size-1;
                    133:   } else {
                    134:     UCell i;
                    135:     for (i=1; i<size && from[i]!='/'; i++)
                    136:       ;
                    137:     {
                    138:       char user[i];
                    139:       memcpy(user,from+1,i-1);
                    140:       user[i-1]='\0';
                    141:       user_entry=getpwnam(user);
                    142:     }
                    143:     if (user_entry==NULL)
                    144:       return cstr(from, size, clear);
                    145:     s1 = user_entry->pw_dir;
                    146:     s2 = from+i;
                    147:     s2_len = size-i;
                    148:   }
                    149:   s1_len = strlen(s1);
                    150:   if (s1_len>1 && s1[s1_len-1]=='/')
                    151:     s1_len--;
                    152:   {
                    153:     char path[s1_len+s2_len];
                    154:     memcpy(path,s1,s1_len);
                    155:     memcpy(path+s1_len,s2,s2_len);
                    156:     return cstr(path,s1_len+s2_len,clear);
                    157:   }
                    158: }
1.4       pazsan    159: #endif   
1.1       anton     160: 
                    161: #define NEWLINE        '\n'
                    162: 
                    163: #ifndef HAVE_RINT
                    164: #define rint(x)        floor((x)+0.5)
                    165: #endif
                    166: 
                    167: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
                    168: 
                    169: #ifndef O_BINARY
                    170: #define O_BINARY 0
                    171: #endif
                    172: #ifndef O_TEXT
                    173: #define O_TEXT 0
                    174: #endif
                    175: 
                    176: static int ufileattr[6]= {
                    177:   O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
                    178:   O_RDWR  |O_TEXT, O_RDWR  |O_BINARY,
                    179:   O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
                    180: 
                    181: /* if machine.h has not defined explicit registers, define them as implicit */
                    182: #ifndef IPREG
                    183: #define IPREG
                    184: #endif
                    185: #ifndef SPREG
                    186: #define SPREG
                    187: #endif
                    188: #ifndef RPREG
                    189: #define RPREG
                    190: #endif
                    191: #ifndef FPREG
                    192: #define FPREG
                    193: #endif
                    194: #ifndef LPREG
                    195: #define LPREG
                    196: #endif
                    197: #ifndef CFAREG
                    198: #define CFAREG
                    199: #endif
                    200: #ifndef UPREG
                    201: #define UPREG
                    202: #endif
                    203: #ifndef TOSREG
                    204: #define TOSREG
                    205: #endif
                    206: #ifndef FTOSREG
                    207: #define FTOSREG
                    208: #endif
                    209: 
                    210: #ifndef CPU_DEP1
                    211: # define CPU_DEP1 0
                    212: #endif
                    213: 
                    214: /* declare and compute cfa for certain threading variants */
                    215: /* warning: this is nonsyntactical; it will not work in place of a statement */
                    216: #ifdef CFA_NEXT
                    217: #define DOCFA
                    218: #else
                    219: #define DOCFA  Xt cfa; GETCFA(cfa)
                    220: #endif
                    221: 
                    222: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
                    223: /* executes code at ip, if ip!=NULL
                    224:    returns array of machine code labels (for use in a loader), if ip==NULL
                    225: */
                    226: {
                    227:   register Xt *ip IPREG = ip0;
                    228:   register Cell *sp SPREG = sp0;
                    229:   register Cell *rp RPREG = rp0;
                    230:   register Float *fp FPREG = fp0;
                    231:   register Address lp LPREG = lp0;
                    232: #ifdef CFA_NEXT
                    233:   register Xt cfa CFAREG;
                    234: #endif
                    235:   register Address up UPREG = UP;
                    236:   IF_TOS(register Cell TOS TOSREG;)
                    237:   IF_FTOS(register Float FTOS FTOSREG;)
                    238: #if defined(DOUBLY_INDIRECT)
                    239:   static Label *symbols;
                    240:   static void *routines[]= {
                    241: #else /* !defined(DOUBLY_INDIRECT) */
                    242:   static Label symbols[]= {
                    243: #endif /* !defined(DOUBLY_INDIRECT) */
1.4       pazsan    244:     (Label)&&docol,
                    245:     (Label)&&docon,
                    246:     (Label)&&dovar,
                    247:     (Label)&&douser,
                    248:     (Label)&&dodefer,
                    249:     (Label)&&dofield,
                    250:     (Label)&&dodoes,
1.1       anton     251:     /* the following entry is normally unused;
                    252:        it's there because its index indicates a does-handler */
1.5       pazsan    253:     (Label)CPU_DEP1,
1.1       anton     254: #include "prim_lab.i"
1.4       pazsan    255:     (Label)0
1.1       anton     256:   };
                    257: #ifdef CPU_DEP2
                    258:   CPU_DEP2
                    259: #endif
                    260: 
                    261: #ifdef DEBUG
                    262:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
                    263:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    264:          (unsigned)fp,(unsigned)lp,(unsigned)up);
                    265: #endif
                    266: 
                    267:   if (ip == NULL) {
                    268: #if defined(DOUBLY_INDIRECT)
1.3       anton     269: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
                    270: #define CODE_OFFSET (22*sizeof(Cell))
1.1       anton     271:     int i;
1.3       anton     272:     Cell code_offset = offset_image? CODE_OFFSET : 0;
1.5       pazsan    273:     
1.3       anton     274:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1       anton     275:     for (i=0; i<DOESJUMP+1; i++)
1.5       pazsan    276:     symbols[i] = routines[i];
1.1       anton     277:     for (; routines[i]!=0; i++) {
                    278:       if (i>=MAX_SYMBOLS) {
                    279:        fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
                    280:        exit(1);
1.5       pazsan    281:       }
                    282:       symbols[i] = &routines[i];
1.1       anton     283:     }
1.5       pazsan    284: #endif /* defined(DOUBLY_INDIRECT) */
                    285:     return symbols;
1.1       anton     286:   }
                    287: 
                    288:   IF_TOS(TOS = sp[0]);
                    289:   IF_FTOS(FTOS = fp[0]);
1.5       pazsan    290:   /*  prep_terminal(); */
1.1       anton     291:   NEXT_P0;
                    292:   NEXT;
                    293: 
                    294: #ifdef CPU_DEP3
                    295:   CPU_DEP3
                    296: #endif
                    297:   
                    298:  docol:
                    299:   {
                    300:     DOCFA;
                    301: #ifdef DEBUG
                    302:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    303: #endif
                    304: #ifdef CISC_NEXT
                    305:     /* this is the simple version */
                    306:     *--rp = (Cell)ip;
                    307:     ip = (Xt *)PFA1(cfa);
                    308:     NEXT_P0;
                    309:     NEXT;
                    310: #else
                    311:     /* this one is important, so we help the compiler optimizing
                    312:        The following version may be better (for scheduling), but probably has
                    313:        problems with code fields employing calls and delay slots
                    314:        */
                    315:     {
                    316:       DEF_CA
                    317:       Xt *current_ip = (Xt *)PFA1(cfa);
                    318:       cfa = *current_ip;
                    319:       NEXT1_P1;
                    320:       *--rp = (Cell)ip;
                    321:       ip = current_ip+1;
                    322:       NEXT1_P2;
                    323:     }
                    324: #endif
                    325:   }
                    326: 
                    327:  docon:
                    328:   {
                    329:     DOCFA;
                    330: #ifdef DEBUG
                    331:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    332: #endif
                    333: #ifdef USE_TOS
                    334:     *sp-- = TOS;
                    335:     TOS = *(Cell *)PFA1(cfa);
                    336: #else
                    337:     *--sp = *(Cell *)PFA1(cfa);
                    338: #endif
                    339:   }
                    340:   NEXT_P0;
                    341:   NEXT;
                    342:   
                    343:  dovar:
                    344:   {
                    345:     DOCFA;
                    346: #ifdef DEBUG
                    347:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    348: #endif
                    349: #ifdef USE_TOS
                    350:     *sp-- = TOS;
                    351:     TOS = (Cell)PFA1(cfa);
                    352: #else
                    353:     *--sp = (Cell)PFA1(cfa);
                    354: #endif
                    355:   }
                    356:   NEXT_P0;
                    357:   NEXT;
                    358:   
                    359:  douser:
                    360:   {
                    361:     DOCFA;
                    362: #ifdef DEBUG
                    363:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    364: #endif
                    365: #ifdef USE_TOS
                    366:     *sp-- = TOS;
                    367:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
                    368: #else
                    369:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
                    370: #endif
                    371:   }
                    372:   NEXT_P0;
                    373:   NEXT;
                    374:   
                    375:  dodefer:
                    376:   {
                    377:     DOCFA;
                    378: #ifdef DEBUG
                    379:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    380: #endif
                    381:     EXEC(*(Xt *)PFA1(cfa));
                    382:   }
                    383: 
                    384:  dofield:
                    385:   {
                    386:     DOCFA;
                    387: #ifdef DEBUG
                    388:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    389: #endif
                    390:     TOS += *(Cell*)PFA1(cfa); 
                    391:   }
                    392:   NEXT_P0;
                    393:   NEXT;
                    394: 
                    395:  dodoes:
                    396:   /* this assumes the following structure:
                    397:      defining-word:
                    398:      
                    399:      ...
                    400:      DOES>
                    401:      (possible padding)
                    402:      possibly handler: jmp dodoes
                    403:      (possible branch delay slot(s))
                    404:      Forth code after DOES>
                    405:      
                    406:      defined word:
                    407:      
                    408:      cfa: address of or jump to handler OR
                    409:           address of or jump to dodoes, address of DOES-code
                    410:      pfa:
                    411:      
                    412:      */
                    413:   {
                    414:     DOCFA;
                    415: 
                    416:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
                    417: #ifdef DEBUG
                    418:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    419:     fflush(stderr);
                    420: #endif
                    421:     *--rp = (Cell)ip;
                    422:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    423:     ip = DOES_CODE1(cfa);
                    424: #ifdef USE_TOS
                    425:     *sp-- = TOS;
                    426:     TOS = (Cell)PFA(cfa);
                    427: #else
                    428:     *--sp = (Cell)PFA(cfa);
                    429: #endif
                    430:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
                    431:   }
                    432:   NEXT_P0;
                    433:   NEXT;
                    434: 
                    435: #include "prim.i"
                    436: }

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