Annotation of gforth/engine.c, revision 1.36

1.31      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.
1.1       anton      20: */
                     21: 
1.33      anton      22: #include "config.h"
1.1       anton      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>
1.2       pazsan     32: #include <time.h>
1.6       pazsan     33: #include <sys/time.h>
1.22      anton      34: #include <unistd.h>
1.25      anton      35: #include <errno.h>
1.27      anton      36: #include <pwd.h>
1.1       anton      37: #include "forth.h"
                     38: #include "io.h"
1.30      pazsan     39: #include "threading.h"
1.1       anton      40: 
1.20      anton      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: 
1.25      anton      46: #define IOR(flag)      ((flag)? -512-errno : 0)
                     47: 
1.1       anton      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: #ifdef USE_TOS
                     60: #define IF_TOS(x) x
                     61: #else
                     62: #define IF_TOS(x)
                     63: #define TOS (sp[0])
                     64: #endif
                     65: 
                     66: #ifdef USE_FTOS
                     67: #define IF_FTOS(x) x
                     68: #else
                     69: #define IF_FTOS(x)
                     70: #define FTOS (fp[0])
                     71: #endif
                     72: 
1.25      anton      73: Cell *SP;
                     74: Float *FP;
1.34      anton      75: #if 0
                     76: /* not used currently */
1.1       anton      77: int emitcounter;
1.34      anton      78: #endif
1.1       anton      79: #define NULLC '\0'
                     80: 
1.14      anton      81: char *cstr(Char *from, UCell size, int clear)
1.33      anton      82: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
                     83:    the C-string lives until the next call of cstr with CLEAR being true */
1.14      anton      84: {
1.33      anton      85:   static struct cstr_buffer {
                     86:     char *buffer;
                     87:     size_t size;
                     88:   } *buffers=NULL;
                     89:   static int nbuffers=0;
                     90:   static int used=0;
                     91:   struct cstr_buffer *b;
1.14      anton      92: 
1.33      anton      93:   if (buffers==NULL)
                     94:     buffers=malloc(0);
1.14      anton      95:   if (clear)
1.33      anton      96:     used=0;
                     97:   if (used>=nbuffers) {
                     98:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
                     99:     buffers[used]=(struct cstr_buffer){malloc(0),0};
                    100:     nbuffers=used+1;
1.14      anton     101:   }
1.33      anton     102:   b=&buffers[used];
                    103:   if (size+1 > b->size) {
                    104:     b->buffer = realloc(b->buffer,size+1);
                    105:     b->size = size+1;
1.14      anton     106:   }
1.33      anton     107:   memcpy(b->buffer,from,size);
                    108:   b->buffer[size]='\0';
                    109:   used++;
                    110:   return b->buffer;
1.14      anton     111: }
1.27      anton     112: 
                    113: char *tilde_cstr(Char *from, UCell size, int clear)
                    114: /* like cstr(), but perform tilde expansion on the string */
                    115: {
                    116:   char *s1,*s2;
                    117:   int s1_len, s2_len;
                    118:   struct passwd *getpwnam (), *user_entry;
                    119: 
                    120:   if (size<1 || from[0]!='~')
                    121:     return cstr(from, size, clear);
                    122:   if (size<2 || from[1]=='/') {
                    123:     s1 = (char *)getenv ("HOME");
                    124:     s2 = from+1;
                    125:     s2_len = size-1;
                    126:   } else {
                    127:     int i;
                    128:     for (i=1; i<size && from[i]!='/'; i++)
                    129:       ;
                    130:     {
                    131:       char user[i];
                    132:       memcpy(user,from+1,i-1);
                    133:       user[i-1]='\0';
                    134:       user_entry=getpwnam(user);
                    135:     }
                    136:     if (user_entry==NULL)
                    137:       return cstr(from, size, clear);
                    138:     s1 = user_entry->pw_dir;
                    139:     s2 = from+i;
                    140:     s2_len = size-i;
                    141:   }
                    142:   s1_len = strlen(s1);
                    143:   if (s1_len>1 && s1[s1_len-1]=='/')
                    144:     s1_len--;
                    145:   {
                    146:     char path[s1_len+s2_len];
                    147:     memcpy(path,s1,s1_len);
                    148:     memcpy(path+s1_len,s2,s2_len);
                    149:     return cstr(path,s1_len+s2_len,clear);
                    150:   }
                    151: }
                    152:    
1.13      pazsan    153: 
1.1       anton     154: #define NEWLINE        '\n'
                    155: 
1.21      pazsan    156: #ifndef HAVE_RINT
                    157: #define rint(x)        floor((x)+0.5)
                    158: #endif
1.13      pazsan    159: 
1.26      anton     160: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
1.6       pazsan    161: 
1.11      pazsan    162: static Address up0=NULL;
                    163: 
1.15      anton     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
1.13      pazsan    192: 
1.32      anton     193: /* declare and compute cfa for certain threading variants */
                    194: /* warning: this is nonsyntactical; it will not work in place of a statement */
                    195: #ifdef CFA_NEXT
                    196: #define DOCFA
                    197: #else
                    198: #define DOCFA  Xt cfa; GETCFA(cfa)
                    199: #endif
                    200: 
1.15      anton     201: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
1.1       anton     202: /* executes code at ip, if ip!=NULL
                    203:    returns array of machine code labels (for use in a loader), if ip==NULL
                    204: */
1.15      anton     205: {
                    206:   register Xt *ip IPREG = ip0;
                    207:   register Cell *sp SPREG = sp0;
                    208:   register Cell *rp RPREG = rp0;
                    209:   register Float *fp FPREG = fp0;
                    210:   register Address lp LPREG = lp0;
1.30      pazsan    211: #ifdef CFA_NEXT
1.15      anton     212:   register Xt cfa CFAREG;
1.30      pazsan    213: #endif
1.15      anton     214:   register Address up UPREG = up0;
                    215:   IF_TOS(register Cell TOS TOSREG;)
                    216:   IF_FTOS(register Float FTOS FTOSREG;)
1.1       anton     217:   static Label symbols[]= {
                    218:     &&docol,
                    219:     &&docon,
                    220:     &&dovar,
1.4       pazsan    221:     &&douser,
1.12      anton     222:     &&dodefer,
1.29      anton     223:     &&dofield,
1.1       anton     224:     &&dodoes,
1.32      anton     225:     /* the following entry is normally unused;
                    226:        it's there because its index indicates a does-handler */
                    227: #ifdef CPU_DEP1
                    228:     CPU_DEP1,
                    229: #else
                    230:     (Label)0,
                    231: #endif
1.1       anton     232: #include "prim_labels.i"
                    233:   };
1.32      anton     234: #ifdef CPU_DEP2
                    235:   CPU_DEP2
1.1       anton     236: #endif
                    237: 
1.16      pazsan    238: #ifdef DEBUG
                    239:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
1.19      anton     240:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    241:          (unsigned)fp,(unsigned)lp,(unsigned)up);
1.16      pazsan    242: #endif
                    243: 
1.1       anton     244:   if (ip == NULL)
                    245:     return symbols;
1.10      anton     246: 
1.1       anton     247:   IF_TOS(TOS = sp[0]);
                    248:   IF_FTOS(FTOS = fp[0]);
1.28      pazsan    249: /*  prep_terminal(); */
1.23      anton     250:   NEXT_P0;
1.1       anton     251:   NEXT;
1.32      anton     252: 
                    253: #ifdef CPU_DEP3
                    254:   CPU_DEP3
                    255: #endif
1.1       anton     256:   
                    257:  docol:
1.30      pazsan    258:   {
1.32      anton     259:     DOCFA;
1.1       anton     260: #ifdef DEBUG
1.32      anton     261:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     262: #endif
1.15      anton     263: #ifdef CISC_NEXT
1.32      anton     264:     /* this is the simple version */
                    265:     *--rp = (Cell)ip;
                    266:     ip = (Xt *)PFA1(cfa);
                    267:     NEXT_P0;
                    268:     NEXT;
1.15      anton     269: #else
1.32      anton     270:     /* this one is important, so we help the compiler optimizing
                    271:        The following version may be better (for scheduling), but probably has
                    272:        problems with code fields employing calls and delay slots
                    273:        */
                    274:     {
                    275:       DEF_CA
                    276:       Xt *current_ip = (Xt *)PFA1(cfa);
                    277:       cfa = *current_ip;
                    278:       NEXT1_P1;
                    279:       *--rp = (Cell)ip;
                    280:       ip = current_ip+1;
                    281:       NEXT1_P2;
                    282:     }
1.15      anton     283: #endif
1.30      pazsan    284:   }
1.23      anton     285: 
1.1       anton     286:  docon:
1.30      pazsan    287:   {
1.32      anton     288:     DOCFA;
1.1       anton     289: #ifdef DEBUG
1.32      anton     290:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
1.1       anton     291: #endif
                    292: #ifdef USE_TOS
1.32      anton     293:     *sp-- = TOS;
                    294:     TOS = *(Cell *)PFA1(cfa);
1.1       anton     295: #else
1.32      anton     296:     *--sp = *(Cell *)PFA1(cfa);
1.1       anton     297: #endif
1.30      pazsan    298:   }
1.23      anton     299:   NEXT_P0;
1.1       anton     300:   NEXT;
                    301:   
                    302:  dovar:
1.30      pazsan    303:   {
1.32      anton     304:     DOCFA;
1.1       anton     305: #ifdef DEBUG
1.32      anton     306:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     307: #endif
                    308: #ifdef USE_TOS
1.32      anton     309:     *sp-- = TOS;
                    310:     TOS = (Cell)PFA1(cfa);
1.1       anton     311: #else
1.32      anton     312:     *--sp = (Cell)PFA1(cfa);
1.1       anton     313: #endif
1.30      pazsan    314:   }
1.23      anton     315:   NEXT_P0;
1.1       anton     316:   NEXT;
                    317:   
1.4       pazsan    318:  douser:
1.30      pazsan    319:   {
1.32      anton     320:     DOCFA;
1.4       pazsan    321: #ifdef DEBUG
1.32      anton     322:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.4       pazsan    323: #endif
                    324: #ifdef USE_TOS
1.32      anton     325:     *sp-- = TOS;
                    326:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    327: #else
1.32      anton     328:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    329: #endif
1.30      pazsan    330:   }
1.23      anton     331:   NEXT_P0;
1.4       pazsan    332:   NEXT;
                    333:   
1.12      anton     334:  dodefer:
1.30      pazsan    335:   {
1.32      anton     336:     DOCFA;
1.12      anton     337: #ifdef DEBUG
1.32      anton     338:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
1.30      pazsan    339: #endif
1.32      anton     340:     EXEC(*(Xt *)PFA1(cfa));
1.30      pazsan    341:   }
1.24      pazsan    342: 
1.29      anton     343:  dofield:
1.30      pazsan    344:   {
1.32      anton     345:     DOCFA;
1.24      pazsan    346: #ifdef DEBUG
1.32      anton     347:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.24      pazsan    348: #endif
1.32      anton     349:     TOS += *(Cell*)PFA1(cfa); 
1.30      pazsan    350:   }
1.24      pazsan    351:   NEXT_P0;
                    352:   NEXT;
1.12      anton     353: 
1.1       anton     354:  dodoes:
                    355:   /* this assumes the following structure:
                    356:      defining-word:
                    357:      
                    358:      ...
                    359:      DOES>
                    360:      (possible padding)
                    361:      possibly handler: jmp dodoes
                    362:      (possible branch delay slot(s))
                    363:      Forth code after DOES>
                    364:      
                    365:      defined word:
                    366:      
                    367:      cfa: address of or jump to handler OR
                    368:           address of or jump to dodoes, address of DOES-code
                    369:      pfa:
                    370:      
                    371:      */
1.30      pazsan    372:   {
1.32      anton     373:     DOCFA;
1.30      pazsan    374: 
1.32      anton     375:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
1.1       anton     376: #ifdef DEBUG
1.32      anton     377:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    378:     fflush(stderr);
1.1       anton     379: #endif
1.32      anton     380:     *--rp = (Cell)ip;
                    381:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    382:     ip = DOES_CODE1(cfa);
1.1       anton     383: #ifdef USE_TOS
1.32      anton     384:     *sp-- = TOS;
                    385:     TOS = (Cell)PFA(cfa);
1.1       anton     386: #else
1.32      anton     387:     *--sp = (Cell)PFA(cfa);
1.30      pazsan    388: #endif
1.32      anton     389:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
1.30      pazsan    390:   }
1.23      anton     391:   NEXT_P0;
1.1       anton     392:   NEXT;
1.16      pazsan    393: 
1.1       anton     394: #include "primitives.i"
                    395: }

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