Annotation of gforth/engine/engine.c, revision 1.3

1.1       anton       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 "threaded.h"
                     40: 
                     41: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
                     42: #include <dlfcn.h>
                     43: #endif
                     44: #ifdef hpux
                     45: #include <dl.h>
                     46: #endif
                     47: 
                     48: #ifndef SEEK_SET
                     49: /* should be defined in stdio.h, but some systems don't have it */
                     50: #define SEEK_SET 0
                     51: #endif
                     52: 
                     53: #define IOR(flag)      ((flag)? -512-errno : 0)
                     54: 
                     55: typedef struct F83Name {
                     56:   struct F83Name       *next;  /* the link field for old hands */
                     57:   char                 countetc;
                     58:   Char                 name[0];
                     59: } F83Name;
                     60: 
                     61: /* are macros for setting necessary? */
                     62: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
                     63: #define F83NAME_SMUDGE(np)     (((np)->countetc & 0x40) != 0)
                     64: #define F83NAME_IMMEDIATE(np)  (((np)->countetc & 0x20) != 0)
                     65: 
                     66: Cell *SP;
                     67: Float *FP;
                     68: Address UP=NULL;
                     69: 
                     70: #if 0
                     71: /* not used currently */
                     72: int emitcounter;
                     73: #endif
                     74: #define NULLC '\0'
                     75: 
                     76: char *cstr(Char *from, UCell size, int clear)
                     77: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
                     78:    the C-string lives until the next call of cstr with CLEAR being true */
                     79: {
                     80:   static struct cstr_buffer {
                     81:     char *buffer;
                     82:     size_t size;
                     83:   } *buffers=NULL;
                     84:   static int nbuffers=0;
                     85:   static int used=0;
                     86:   struct cstr_buffer *b;
                     87: 
                     88:   if (buffers==NULL)
                     89:     buffers=malloc(0);
                     90:   if (clear)
                     91:     used=0;
                     92:   if (used>=nbuffers) {
                     93:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
                     94:     buffers[used]=(struct cstr_buffer){malloc(0),0};
                     95:     nbuffers=used+1;
                     96:   }
                     97:   b=&buffers[used];
                     98:   if (size+1 > b->size) {
                     99:     b->buffer = realloc(b->buffer,size+1);
                    100:     b->size = size+1;
                    101:   }
                    102:   memcpy(b->buffer,from,size);
                    103:   b->buffer[size]='\0';
                    104:   used++;
                    105:   return b->buffer;
                    106: }
                    107: 
                    108: char *tilde_cstr(Char *from, UCell size, int clear)
                    109: /* like cstr(), but perform tilde expansion on the string */
                    110: {
                    111:   char *s1,*s2;
                    112:   int s1_len, s2_len;
                    113:   struct passwd *getpwnam (), *user_entry;
                    114: 
                    115:   if (size<1 || from[0]!='~')
                    116:     return cstr(from, size, clear);
                    117:   if (size<2 || from[1]=='/') {
                    118:     s1 = (char *)getenv ("HOME");
                    119:     if(s1 == NULL)
                    120:       s1 = "";
                    121:     s2 = from+1;
                    122:     s2_len = size-1;
                    123:   } else {
                    124:     UCell i;
                    125:     for (i=1; i<size && from[i]!='/'; i++)
                    126:       ;
                    127:     {
                    128:       char user[i];
                    129:       memcpy(user,from+1,i-1);
                    130:       user[i-1]='\0';
                    131:       user_entry=getpwnam(user);
                    132:     }
                    133:     if (user_entry==NULL)
                    134:       return cstr(from, size, clear);
                    135:     s1 = user_entry->pw_dir;
                    136:     s2 = from+i;
                    137:     s2_len = size-i;
                    138:   }
                    139:   s1_len = strlen(s1);
                    140:   if (s1_len>1 && s1[s1_len-1]=='/')
                    141:     s1_len--;
                    142:   {
                    143:     char path[s1_len+s2_len];
                    144:     memcpy(path,s1,s1_len);
                    145:     memcpy(path+s1_len,s2,s2_len);
                    146:     return cstr(path,s1_len+s2_len,clear);
                    147:   }
                    148: }
                    149:    
                    150: 
                    151: #define NEWLINE        '\n'
                    152: 
                    153: #ifndef HAVE_RINT
                    154: #define rint(x)        floor((x)+0.5)
                    155: #endif
                    156: 
                    157: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
                    158: 
                    159: #ifndef O_BINARY
                    160: #define O_BINARY 0
                    161: #endif
                    162: #ifndef O_TEXT
                    163: #define O_TEXT 0
                    164: #endif
                    165: 
                    166: static int ufileattr[6]= {
                    167:   O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
                    168:   O_RDWR  |O_TEXT, O_RDWR  |O_BINARY,
                    169:   O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
                    170: 
                    171: /* if machine.h has not defined explicit registers, define them as implicit */
                    172: #ifndef IPREG
                    173: #define IPREG
                    174: #endif
                    175: #ifndef SPREG
                    176: #define SPREG
                    177: #endif
                    178: #ifndef RPREG
                    179: #define RPREG
                    180: #endif
                    181: #ifndef FPREG
                    182: #define FPREG
                    183: #endif
                    184: #ifndef LPREG
                    185: #define LPREG
                    186: #endif
                    187: #ifndef CFAREG
                    188: #define CFAREG
                    189: #endif
                    190: #ifndef UPREG
                    191: #define UPREG
                    192: #endif
                    193: #ifndef TOSREG
                    194: #define TOSREG
                    195: #endif
                    196: #ifndef FTOSREG
                    197: #define FTOSREG
                    198: #endif
                    199: 
                    200: #ifndef CPU_DEP1
                    201: # define CPU_DEP1 0
                    202: #endif
                    203: 
                    204: /* declare and compute cfa for certain threading variants */
                    205: /* warning: this is nonsyntactical; it will not work in place of a statement */
                    206: #ifdef CFA_NEXT
                    207: #define DOCFA
                    208: #else
                    209: #define DOCFA  Xt cfa; GETCFA(cfa)
                    210: #endif
                    211: 
                    212: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
                    213: /* executes code at ip, if ip!=NULL
                    214:    returns array of machine code labels (for use in a loader), if ip==NULL
                    215: */
                    216: {
                    217:   register Xt *ip IPREG = ip0;
                    218:   register Cell *sp SPREG = sp0;
                    219:   register Cell *rp RPREG = rp0;
                    220:   register Float *fp FPREG = fp0;
                    221:   register Address lp LPREG = lp0;
                    222: #ifdef CFA_NEXT
                    223:   register Xt cfa CFAREG;
                    224: #endif
                    225:   register Address up UPREG = UP;
                    226:   IF_TOS(register Cell TOS TOSREG;)
                    227:   IF_FTOS(register Float FTOS FTOSREG;)
                    228: #if defined(DOUBLY_INDIRECT)
                    229:   static Label *symbols;
                    230:   static void *routines[]= {
                    231: #else /* !defined(DOUBLY_INDIRECT) */
                    232:   static Label symbols[]= {
                    233: #endif /* !defined(DOUBLY_INDIRECT) */
                    234:     &&docol,
                    235:     &&docon,
                    236:     &&dovar,
                    237:     &&douser,
                    238:     &&dodefer,
                    239:     &&dofield,
                    240:     &&dodoes,
                    241:     /* the following entry is normally unused;
                    242:        it's there because its index indicates a does-handler */
                    243:     CPU_DEP1,
                    244: #include "prim_lab.i"
                    245:     0
                    246:   };
                    247: #ifdef CPU_DEP2
                    248:   CPU_DEP2
                    249: #endif
                    250: 
                    251: #ifdef DEBUG
                    252:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
                    253:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    254:          (unsigned)fp,(unsigned)lp,(unsigned)up);
                    255: #endif
                    256: 
                    257:   if (ip == NULL) {
                    258: #if defined(DOUBLY_INDIRECT)
1.3     ! anton     259: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
        !           260: #define CODE_OFFSET (22*sizeof(Cell))
1.1       anton     261:     int i;
1.3     ! anton     262:     Cell code_offset = offset_image? CODE_OFFSET : 0;
1.1       anton     263: 
1.3     ! anton     264:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1       anton     265:     for (i=0; i<DOESJUMP+1; i++)
                    266:       symbols[i] = (Label)routines[i];
                    267:     for (; routines[i]!=0; i++) {
                    268:       if (i>=MAX_SYMBOLS) {
                    269:        fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
                    270:        exit(1);
                    271:     }
                    272:     symbols[i] = &routines[i];
                    273:   }
                    274: #endif /* defined(DOUBLY_INDIRECT) */
                    275:   return symbols;
                    276: }
                    277: 
                    278:   IF_TOS(TOS = sp[0]);
                    279:   IF_FTOS(FTOS = fp[0]);
                    280: /*  prep_terminal(); */
                    281:   NEXT_P0;
                    282:   NEXT;
                    283: 
                    284: #ifdef CPU_DEP3
                    285:   CPU_DEP3
                    286: #endif
                    287:   
                    288:  docol:
                    289:   {
                    290:     DOCFA;
                    291: #ifdef DEBUG
                    292:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    293: #endif
                    294: #ifdef CISC_NEXT
                    295:     /* this is the simple version */
                    296:     *--rp = (Cell)ip;
                    297:     ip = (Xt *)PFA1(cfa);
                    298:     NEXT_P0;
                    299:     NEXT;
                    300: #else
                    301:     /* this one is important, so we help the compiler optimizing
                    302:        The following version may be better (for scheduling), but probably has
                    303:        problems with code fields employing calls and delay slots
                    304:        */
                    305:     {
                    306:       DEF_CA
                    307:       Xt *current_ip = (Xt *)PFA1(cfa);
                    308:       cfa = *current_ip;
                    309:       NEXT1_P1;
                    310:       *--rp = (Cell)ip;
                    311:       ip = current_ip+1;
                    312:       NEXT1_P2;
                    313:     }
                    314: #endif
                    315:   }
                    316: 
                    317:  docon:
                    318:   {
                    319:     DOCFA;
                    320: #ifdef DEBUG
                    321:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    322: #endif
                    323: #ifdef USE_TOS
                    324:     *sp-- = TOS;
                    325:     TOS = *(Cell *)PFA1(cfa);
                    326: #else
                    327:     *--sp = *(Cell *)PFA1(cfa);
                    328: #endif
                    329:   }
                    330:   NEXT_P0;
                    331:   NEXT;
                    332:   
                    333:  dovar:
                    334:   {
                    335:     DOCFA;
                    336: #ifdef DEBUG
                    337:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    338: #endif
                    339: #ifdef USE_TOS
                    340:     *sp-- = TOS;
                    341:     TOS = (Cell)PFA1(cfa);
                    342: #else
                    343:     *--sp = (Cell)PFA1(cfa);
                    344: #endif
                    345:   }
                    346:   NEXT_P0;
                    347:   NEXT;
                    348:   
                    349:  douser:
                    350:   {
                    351:     DOCFA;
                    352: #ifdef DEBUG
                    353:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    354: #endif
                    355: #ifdef USE_TOS
                    356:     *sp-- = TOS;
                    357:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
                    358: #else
                    359:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
                    360: #endif
                    361:   }
                    362:   NEXT_P0;
                    363:   NEXT;
                    364:   
                    365:  dodefer:
                    366:   {
                    367:     DOCFA;
                    368: #ifdef DEBUG
                    369:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    370: #endif
                    371:     EXEC(*(Xt *)PFA1(cfa));
                    372:   }
                    373: 
                    374:  dofield:
                    375:   {
                    376:     DOCFA;
                    377: #ifdef DEBUG
                    378:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    379: #endif
                    380:     TOS += *(Cell*)PFA1(cfa); 
                    381:   }
                    382:   NEXT_P0;
                    383:   NEXT;
                    384: 
                    385:  dodoes:
                    386:   /* this assumes the following structure:
                    387:      defining-word:
                    388:      
                    389:      ...
                    390:      DOES>
                    391:      (possible padding)
                    392:      possibly handler: jmp dodoes
                    393:      (possible branch delay slot(s))
                    394:      Forth code after DOES>
                    395:      
                    396:      defined word:
                    397:      
                    398:      cfa: address of or jump to handler OR
                    399:           address of or jump to dodoes, address of DOES-code
                    400:      pfa:
                    401:      
                    402:      */
                    403:   {
                    404:     DOCFA;
                    405: 
                    406:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
                    407: #ifdef DEBUG
                    408:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    409:     fflush(stderr);
                    410: #endif
                    411:     *--rp = (Cell)ip;
                    412:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    413:     ip = DOES_CODE1(cfa);
                    414: #ifdef USE_TOS
                    415:     *sp-- = TOS;
                    416:     TOS = (Cell)PFA(cfa);
                    417: #else
                    418:     *--sp = (Cell)PFA(cfa);
                    419: #endif
                    420:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
                    421:   }
                    422:   NEXT_P0;
                    423:   NEXT;
                    424: 
                    425: #include "prim.i"
                    426: }

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