Annotation of gforth/engine.c, revision 1.40

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: 
1.25      anton      59: Cell *SP;
                     60: Float *FP;
1.40    ! pazsan     61: Address UP=NULL;
        !            62: 
1.34      anton      63: #if 0
                     64: /* not used currently */
1.1       anton      65: int emitcounter;
1.34      anton      66: #endif
1.1       anton      67: #define NULLC '\0'
                     68: 
1.14      anton      69: char *cstr(Char *from, UCell size, int clear)
1.33      anton      70: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
                     71:    the C-string lives until the next call of cstr with CLEAR being true */
1.14      anton      72: {
1.33      anton      73:   static struct cstr_buffer {
                     74:     char *buffer;
                     75:     size_t size;
                     76:   } *buffers=NULL;
                     77:   static int nbuffers=0;
                     78:   static int used=0;
                     79:   struct cstr_buffer *b;
1.14      anton      80: 
1.33      anton      81:   if (buffers==NULL)
                     82:     buffers=malloc(0);
1.14      anton      83:   if (clear)
1.33      anton      84:     used=0;
                     85:   if (used>=nbuffers) {
                     86:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
                     87:     buffers[used]=(struct cstr_buffer){malloc(0),0};
                     88:     nbuffers=used+1;
1.14      anton      89:   }
1.33      anton      90:   b=&buffers[used];
                     91:   if (size+1 > b->size) {
                     92:     b->buffer = realloc(b->buffer,size+1);
                     93:     b->size = size+1;
1.14      anton      94:   }
1.33      anton      95:   memcpy(b->buffer,from,size);
                     96:   b->buffer[size]='\0';
                     97:   used++;
                     98:   return b->buffer;
1.14      anton      99: }
1.27      anton     100: 
                    101: char *tilde_cstr(Char *from, UCell size, int clear)
                    102: /* like cstr(), but perform tilde expansion on the string */
                    103: {
                    104:   char *s1,*s2;
                    105:   int s1_len, s2_len;
                    106:   struct passwd *getpwnam (), *user_entry;
                    107: 
                    108:   if (size<1 || from[0]!='~')
                    109:     return cstr(from, size, clear);
                    110:   if (size<2 || from[1]=='/') {
                    111:     s1 = (char *)getenv ("HOME");
1.40    ! pazsan    112:     if(s1 == NULL)
        !           113:       s1 = "";
1.27      anton     114:     s2 = from+1;
                    115:     s2_len = size-1;
                    116:   } else {
1.39      pazsan    117:     UCell i;
1.27      anton     118:     for (i=1; i<size && from[i]!='/'; i++)
                    119:       ;
                    120:     {
                    121:       char user[i];
                    122:       memcpy(user,from+1,i-1);
                    123:       user[i-1]='\0';
                    124:       user_entry=getpwnam(user);
                    125:     }
                    126:     if (user_entry==NULL)
                    127:       return cstr(from, size, clear);
                    128:     s1 = user_entry->pw_dir;
                    129:     s2 = from+i;
                    130:     s2_len = size-i;
                    131:   }
                    132:   s1_len = strlen(s1);
                    133:   if (s1_len>1 && s1[s1_len-1]=='/')
                    134:     s1_len--;
                    135:   {
                    136:     char path[s1_len+s2_len];
                    137:     memcpy(path,s1,s1_len);
                    138:     memcpy(path+s1_len,s2,s2_len);
                    139:     return cstr(path,s1_len+s2_len,clear);
                    140:   }
                    141: }
                    142:    
1.13      pazsan    143: 
1.1       anton     144: #define NEWLINE        '\n'
                    145: 
1.21      pazsan    146: #ifndef HAVE_RINT
                    147: #define rint(x)        floor((x)+0.5)
                    148: #endif
1.13      pazsan    149: 
1.26      anton     150: static char* fileattr[6]={"r","rb","r+","r+b","w","wb"};
1.6       pazsan    151: 
1.40    ! pazsan    152: #ifndef O_BINARY
        !           153: #define O_BINARY 0
        !           154: #endif
        !           155: #ifndef O_TEXT
        !           156: #define O_TEXT 0
        !           157: #endif
        !           158: 
        !           159: static int ufileattr[6]= {
        !           160:   O_RDONLY|O_TEXT, O_RDONLY|O_BINARY,
        !           161:   O_RDWR  |O_TEXT, O_RDWR  |O_BINARY,
        !           162:   O_WRONLY|O_TEXT, O_WRONLY|O_BINARY };
1.11      pazsan    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
1.40    ! pazsan    214:   register Address up UPREG = UP;
1.15      anton     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"
1.37      anton     233:     (Label)0
1.1       anton     234:   };
1.32      anton     235: #ifdef CPU_DEP2
                    236:   CPU_DEP2
1.1       anton     237: #endif
                    238: 
1.16      pazsan    239: #ifdef DEBUG
                    240:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
1.19      anton     241:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    242:          (unsigned)fp,(unsigned)lp,(unsigned)up);
1.16      pazsan    243: #endif
                    244: 
1.1       anton     245:   if (ip == NULL)
                    246:     return symbols;
1.10      anton     247: 
1.1       anton     248:   IF_TOS(TOS = sp[0]);
                    249:   IF_FTOS(FTOS = fp[0]);
1.28      pazsan    250: /*  prep_terminal(); */
1.23      anton     251:   NEXT_P0;
1.1       anton     252:   NEXT;
1.32      anton     253: 
                    254: #ifdef CPU_DEP3
                    255:   CPU_DEP3
                    256: #endif
1.1       anton     257:   
                    258:  docol:
1.30      pazsan    259:   {
1.32      anton     260:     DOCFA;
1.1       anton     261: #ifdef DEBUG
1.32      anton     262:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     263: #endif
1.15      anton     264: #ifdef CISC_NEXT
1.32      anton     265:     /* this is the simple version */
                    266:     *--rp = (Cell)ip;
                    267:     ip = (Xt *)PFA1(cfa);
                    268:     NEXT_P0;
                    269:     NEXT;
1.15      anton     270: #else
1.32      anton     271:     /* this one is important, so we help the compiler optimizing
                    272:        The following version may be better (for scheduling), but probably has
                    273:        problems with code fields employing calls and delay slots
                    274:        */
                    275:     {
                    276:       DEF_CA
                    277:       Xt *current_ip = (Xt *)PFA1(cfa);
                    278:       cfa = *current_ip;
                    279:       NEXT1_P1;
                    280:       *--rp = (Cell)ip;
                    281:       ip = current_ip+1;
                    282:       NEXT1_P2;
                    283:     }
1.15      anton     284: #endif
1.30      pazsan    285:   }
1.23      anton     286: 
1.1       anton     287:  docon:
1.30      pazsan    288:   {
1.32      anton     289:     DOCFA;
1.1       anton     290: #ifdef DEBUG
1.32      anton     291:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
1.1       anton     292: #endif
                    293: #ifdef USE_TOS
1.32      anton     294:     *sp-- = TOS;
                    295:     TOS = *(Cell *)PFA1(cfa);
1.1       anton     296: #else
1.32      anton     297:     *--sp = *(Cell *)PFA1(cfa);
1.1       anton     298: #endif
1.30      pazsan    299:   }
1.23      anton     300:   NEXT_P0;
1.1       anton     301:   NEXT;
                    302:   
                    303:  dovar:
1.30      pazsan    304:   {
1.32      anton     305:     DOCFA;
1.1       anton     306: #ifdef DEBUG
1.32      anton     307:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     308: #endif
                    309: #ifdef USE_TOS
1.32      anton     310:     *sp-- = TOS;
                    311:     TOS = (Cell)PFA1(cfa);
1.1       anton     312: #else
1.32      anton     313:     *--sp = (Cell)PFA1(cfa);
1.1       anton     314: #endif
1.30      pazsan    315:   }
1.23      anton     316:   NEXT_P0;
1.1       anton     317:   NEXT;
                    318:   
1.4       pazsan    319:  douser:
1.30      pazsan    320:   {
1.32      anton     321:     DOCFA;
1.4       pazsan    322: #ifdef DEBUG
1.32      anton     323:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.4       pazsan    324: #endif
                    325: #ifdef USE_TOS
1.32      anton     326:     *sp-- = TOS;
                    327:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    328: #else
1.32      anton     329:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    330: #endif
1.30      pazsan    331:   }
1.23      anton     332:   NEXT_P0;
1.4       pazsan    333:   NEXT;
                    334:   
1.12      anton     335:  dodefer:
1.30      pazsan    336:   {
1.32      anton     337:     DOCFA;
1.12      anton     338: #ifdef DEBUG
1.32      anton     339:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
1.30      pazsan    340: #endif
1.32      anton     341:     EXEC(*(Xt *)PFA1(cfa));
1.30      pazsan    342:   }
1.24      pazsan    343: 
1.29      anton     344:  dofield:
1.30      pazsan    345:   {
1.32      anton     346:     DOCFA;
1.24      pazsan    347: #ifdef DEBUG
1.32      anton     348:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
1.24      pazsan    349: #endif
1.32      anton     350:     TOS += *(Cell*)PFA1(cfa); 
1.30      pazsan    351:   }
1.24      pazsan    352:   NEXT_P0;
                    353:   NEXT;
1.12      anton     354: 
1.1       anton     355:  dodoes:
                    356:   /* this assumes the following structure:
                    357:      defining-word:
                    358:      
                    359:      ...
                    360:      DOES>
                    361:      (possible padding)
                    362:      possibly handler: jmp dodoes
                    363:      (possible branch delay slot(s))
                    364:      Forth code after DOES>
                    365:      
                    366:      defined word:
                    367:      
                    368:      cfa: address of or jump to handler OR
                    369:           address of or jump to dodoes, address of DOES-code
                    370:      pfa:
                    371:      
                    372:      */
1.30      pazsan    373:   {
1.32      anton     374:     DOCFA;
1.30      pazsan    375: 
1.32      anton     376:     /*    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     377: #ifdef DEBUG
1.32      anton     378:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    379:     fflush(stderr);
1.1       anton     380: #endif
1.32      anton     381:     *--rp = (Cell)ip;
                    382:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    383:     ip = DOES_CODE1(cfa);
1.1       anton     384: #ifdef USE_TOS
1.32      anton     385:     *sp-- = TOS;
                    386:     TOS = (Cell)PFA(cfa);
1.1       anton     387: #else
1.32      anton     388:     *--sp = (Cell)PFA(cfa);
1.30      pazsan    389: #endif
1.32      anton     390:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
1.30      pazsan    391:   }
1.23      anton     392:   NEXT_P0;
1.1       anton     393:   NEXT;
1.16      pazsan    394: 
1.1       anton     395: #include "primitives.i"
                    396: }

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