Annotation of gforth/engine/engine.c, revision 1.20

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>
1.17      pazsan     41: #include <dirent.h>
1.19      anton      42: #ifdef HAVE_FNMATCH_H
1.18      anton      43: #include <fnmatch.h>
1.19      anton      44: #else
                     45: #include "fnmatch.h"
                     46: #endif
1.4       pazsan     47: #else
                     48: #include "systypes.h"
                     49: #endif
1.1       anton      50: 
                     51: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
                     52: #include <dlfcn.h>
                     53: #endif
1.8       pazsan     54: #if defined(_WIN32)
                     55: #include <windows.h>
                     56: #endif
1.1       anton      57: #ifdef hpux
                     58: #include <dl.h>
                     59: #endif
                     60: 
                     61: #ifndef SEEK_SET
                     62: /* should be defined in stdio.h, but some systems don't have it */
                     63: #define SEEK_SET 0
                     64: #endif
                     65: 
                     66: #define IOR(flag)      ((flag)? -512-errno : 0)
                     67: 
1.4       pazsan     68: struct F83Name {
                     69:   struct F83Name *next;  /* the link field for old hands */
                     70:   char         countetc;
                     71:   char         name[0];
                     72: };
1.1       anton      73: 
                     74: /* are macros for setting necessary? */
                     75: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
                     76: #define F83NAME_SMUDGE(np)     (((np)->countetc & 0x40) != 0)
                     77: #define F83NAME_IMMEDIATE(np)  (((np)->countetc & 0x20) != 0)
                     78: 
                     79: Cell *SP;
                     80: Float *FP;
                     81: Address UP=NULL;
                     82: 
                     83: #if 0
                     84: /* not used currently */
                     85: int emitcounter;
                     86: #endif
                     87: #define NULLC '\0'
                     88: 
1.14      pazsan     89: #ifdef MEMCMP_AS_SUBROUTINE
                     90: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
1.15      anton      91: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
1.14      pazsan     92: #endif
                     93: 
1.9       pazsan     94: #ifdef HAS_FILE
1.1       anton      95: char *cstr(Char *from, UCell size, int clear)
                     96: /* return a C-string corresponding to the Forth string ( FROM SIZE ).
                     97:    the C-string lives until the next call of cstr with CLEAR being true */
                     98: {
                     99:   static struct cstr_buffer {
                    100:     char *buffer;
                    101:     size_t size;
                    102:   } *buffers=NULL;
                    103:   static int nbuffers=0;
                    104:   static int used=0;
                    105:   struct cstr_buffer *b;
                    106: 
                    107:   if (buffers==NULL)
                    108:     buffers=malloc(0);
                    109:   if (clear)
                    110:     used=0;
                    111:   if (used>=nbuffers) {
                    112:     buffers=realloc(buffers,sizeof(struct cstr_buffer)*(used+1));
                    113:     buffers[used]=(struct cstr_buffer){malloc(0),0};
                    114:     nbuffers=used+1;
                    115:   }
                    116:   b=&buffers[used];
                    117:   if (size+1 > b->size) {
                    118:     b->buffer = realloc(b->buffer,size+1);
                    119:     b->size = size+1;
                    120:   }
                    121:   memcpy(b->buffer,from,size);
                    122:   b->buffer[size]='\0';
                    123:   used++;
                    124:   return b->buffer;
                    125: }
                    126: 
                    127: char *tilde_cstr(Char *from, UCell size, int clear)
                    128: /* like cstr(), but perform tilde expansion on the string */
                    129: {
                    130:   char *s1,*s2;
                    131:   int s1_len, s2_len;
                    132:   struct passwd *getpwnam (), *user_entry;
                    133: 
                    134:   if (size<1 || from[0]!='~')
                    135:     return cstr(from, size, clear);
                    136:   if (size<2 || from[1]=='/') {
                    137:     s1 = (char *)getenv ("HOME");
                    138:     if(s1 == NULL)
                    139:       s1 = "";
                    140:     s2 = from+1;
                    141:     s2_len = size-1;
                    142:   } else {
                    143:     UCell i;
                    144:     for (i=1; i<size && from[i]!='/'; i++)
                    145:       ;
1.13      anton     146:     if (i==2 && from[1]=='+') /* deal with "~+", i.e., the wd */
                    147:       return cstr(from+3, size<3?0:size-3,clear);
1.1       anton     148:     {
                    149:       char user[i];
                    150:       memcpy(user,from+1,i-1);
                    151:       user[i-1]='\0';
                    152:       user_entry=getpwnam(user);
                    153:     }
                    154:     if (user_entry==NULL)
                    155:       return cstr(from, size, clear);
                    156:     s1 = user_entry->pw_dir;
                    157:     s2 = from+i;
                    158:     s2_len = size-i;
                    159:   }
                    160:   s1_len = strlen(s1);
                    161:   if (s1_len>1 && s1[s1_len-1]=='/')
                    162:     s1_len--;
                    163:   {
                    164:     char path[s1_len+s2_len];
                    165:     memcpy(path,s1,s1_len);
                    166:     memcpy(path+s1_len,s2,s2_len);
                    167:     return cstr(path,s1_len+s2_len,clear);
                    168:   }
                    169: }
1.9       pazsan    170: #endif
1.1       anton     171: 
                    172: #define NEWLINE        '\n'
                    173: 
                    174: #ifndef HAVE_RINT
                    175: #define rint(x)        floor((x)+0.5)
                    176: #endif
                    177: 
1.9       pazsan    178: #ifdef HAS_FILE
1.16      anton     179: static char* fileattr[6]={"rb","rb","r+b","r+b","wb","wb"};
1.1       anton     180: 
                    181: #ifndef O_BINARY
                    182: #define O_BINARY 0
                    183: #endif
                    184: #ifndef O_TEXT
                    185: #define O_TEXT 0
                    186: #endif
                    187: 
                    188: static int ufileattr[6]= {
1.16      anton     189:   O_RDONLY|O_BINARY, O_RDONLY|O_BINARY,
                    190:   O_RDWR  |O_BINARY, O_RDWR  |O_BINARY,
                    191:   O_WRONLY|O_BINARY, O_WRONLY|O_BINARY };
1.9       pazsan    192: #endif
1.1       anton     193: 
                    194: /* if machine.h has not defined explicit registers, define them as implicit */
                    195: #ifndef IPREG
                    196: #define IPREG
                    197: #endif
                    198: #ifndef SPREG
                    199: #define SPREG
                    200: #endif
                    201: #ifndef RPREG
                    202: #define RPREG
                    203: #endif
                    204: #ifndef FPREG
                    205: #define FPREG
                    206: #endif
                    207: #ifndef LPREG
                    208: #define LPREG
                    209: #endif
                    210: #ifndef CFAREG
                    211: #define CFAREG
                    212: #endif
                    213: #ifndef UPREG
                    214: #define UPREG
                    215: #endif
                    216: #ifndef TOSREG
                    217: #define TOSREG
                    218: #endif
                    219: #ifndef FTOSREG
                    220: #define FTOSREG
                    221: #endif
                    222: 
                    223: #ifndef CPU_DEP1
                    224: # define CPU_DEP1 0
                    225: #endif
                    226: 
                    227: /* declare and compute cfa for certain threading variants */
                    228: /* warning: this is nonsyntactical; it will not work in place of a statement */
1.12      anton     229: #ifndef GETCFA
1.1       anton     230: #define DOCFA
                    231: #else
                    232: #define DOCFA  Xt cfa; GETCFA(cfa)
                    233: #endif
                    234: 
1.10      anton     235: #ifdef GFORTH_DEBUGGING
                    236: /* define some VM registers as global variables, so they survive exceptions;
                    237:    global register variables are not up to the task (according to the 
                    238:    GNU C manual) */
                    239: Xt *ip;
                    240: Cell *rp;
                    241: #endif
                    242: 
1.1       anton     243: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
                    244: /* executes code at ip, if ip!=NULL
                    245:    returns array of machine code labels (for use in a loader), if ip==NULL
                    246: */
                    247: {
1.10      anton     248: #ifndef GFORTH_DEBUGGING
                    249:   register Xt *ip IPREG;
                    250:   register Cell *rp RPREG;
                    251: #endif
1.1       anton     252:   register Cell *sp SPREG = sp0;
                    253:   register Float *fp FPREG = fp0;
                    254:   register Address lp LPREG = lp0;
                    255: #ifdef CFA_NEXT
                    256:   register Xt cfa CFAREG;
                    257: #endif
1.11      anton     258: #ifdef MORE_VARS
                    259:   MORE_VARS
                    260: #endif
1.1       anton     261:   register Address up UPREG = UP;
                    262:   IF_TOS(register Cell TOS TOSREG;)
                    263:   IF_FTOS(register Float FTOS FTOSREG;)
                    264: #if defined(DOUBLY_INDIRECT)
                    265:   static Label *symbols;
                    266:   static void *routines[]= {
                    267: #else /* !defined(DOUBLY_INDIRECT) */
                    268:   static Label symbols[]= {
                    269: #endif /* !defined(DOUBLY_INDIRECT) */
1.4       pazsan    270:     (Label)&&docol,
                    271:     (Label)&&docon,
                    272:     (Label)&&dovar,
                    273:     (Label)&&douser,
                    274:     (Label)&&dodefer,
                    275:     (Label)&&dofield,
                    276:     (Label)&&dodoes,
1.1       anton     277:     /* the following entry is normally unused;
                    278:        it's there because its index indicates a does-handler */
1.7       pazsan    279:     CPU_DEP1,
1.1       anton     280: #include "prim_lab.i"
1.4       pazsan    281:     (Label)0
1.1       anton     282:   };
                    283: #ifdef CPU_DEP2
                    284:   CPU_DEP2
                    285: #endif
                    286: 
1.10      anton     287:   ip = ip0;
                    288:   rp = rp0;
1.1       anton     289: #ifdef DEBUG
                    290:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
                    291:           (unsigned)ip,(unsigned)sp,(unsigned)rp,
                    292:          (unsigned)fp,(unsigned)lp,(unsigned)up);
                    293: #endif
                    294: 
                    295:   if (ip == NULL) {
                    296: #if defined(DOUBLY_INDIRECT)
1.3       anton     297: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
                    298: #define CODE_OFFSET (22*sizeof(Cell))
1.1       anton     299:     int i;
1.3       anton     300:     Cell code_offset = offset_image? CODE_OFFSET : 0;
1.7       pazsan    301: 
1.3       anton     302:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
1.1       anton     303:     for (i=0; i<DOESJUMP+1; i++)
1.7       pazsan    304:       symbols[i] = (Label)routines[i];
1.1       anton     305:     for (; routines[i]!=0; i++) {
                    306:       if (i>=MAX_SYMBOLS) {
                    307:        fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
                    308:        exit(1);
1.20    ! anton     309:       }
        !           310:       symbols[i] = &routines[i];
1.1       anton     311:     }
1.20    ! anton     312: #endif /* defined(DOUBLY_INDIRECT) */
        !           313:     return symbols;
1.7       pazsan    314:   }
1.1       anton     315: 
                    316:   IF_TOS(TOS = sp[0]);
                    317:   IF_FTOS(FTOS = fp[0]);
1.7       pazsan    318: /*  prep_terminal(); */
1.11      anton     319:   SET_IP(ip);
1.1       anton     320:   NEXT;
                    321: 
1.11      anton     322: 
1.1       anton     323: #ifdef CPU_DEP3
                    324:   CPU_DEP3
                    325: #endif
                    326:   
                    327:  docol:
                    328:   {
                    329:     DOCFA;
                    330: #ifdef DEBUG
                    331:     fprintf(stderr,"%08lx: col: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    332: #endif
                    333: #ifdef CISC_NEXT
                    334:     /* this is the simple version */
                    335:     *--rp = (Cell)ip;
1.11      anton     336:     SET_IP((Xt *)PFA1(cfa));
1.1       anton     337:     NEXT;
                    338: #else
1.11      anton     339:     /* this one is important, so we help the compiler optimizing */
1.1       anton     340:     {
                    341:       DEF_CA
1.11      anton     342:       rp[-1] = (Cell)ip;
                    343:       SET_IP((Xt *)PFA1(cfa));
                    344:       NEXT_P1;
                    345:       rp--;
                    346:       NEXT_P2;
1.1       anton     347:     }
                    348: #endif
                    349:   }
                    350: 
                    351:  docon:
                    352:   {
                    353:     DOCFA;
                    354: #ifdef DEBUG
                    355:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    356: #endif
                    357: #ifdef USE_TOS
                    358:     *sp-- = TOS;
                    359:     TOS = *(Cell *)PFA1(cfa);
                    360: #else
                    361:     *--sp = *(Cell *)PFA1(cfa);
                    362: #endif
                    363:   }
                    364:   NEXT_P0;
                    365:   NEXT;
                    366:   
                    367:  dovar:
                    368:   {
                    369:     DOCFA;
                    370: #ifdef DEBUG
                    371:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    372: #endif
                    373: #ifdef USE_TOS
                    374:     *sp-- = TOS;
                    375:     TOS = (Cell)PFA1(cfa);
                    376: #else
                    377:     *--sp = (Cell)PFA1(cfa);
                    378: #endif
                    379:   }
                    380:   NEXT_P0;
                    381:   NEXT;
                    382:   
                    383:  douser:
                    384:   {
                    385:     DOCFA;
                    386: #ifdef DEBUG
                    387:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    388: #endif
                    389: #ifdef USE_TOS
                    390:     *sp-- = TOS;
                    391:     TOS = (Cell)(up+*(Cell*)PFA1(cfa));
                    392: #else
                    393:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
                    394: #endif
                    395:   }
                    396:   NEXT_P0;
                    397:   NEXT;
                    398:   
                    399:  dodefer:
                    400:   {
                    401:     DOCFA;
                    402: #ifdef DEBUG
                    403:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
                    404: #endif
                    405:     EXEC(*(Xt *)PFA1(cfa));
                    406:   }
                    407: 
                    408:  dofield:
                    409:   {
                    410:     DOCFA;
                    411: #ifdef DEBUG
                    412:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
                    413: #endif
1.11      anton     414:     TOS += *(Cell*)PFA1(cfa);
1.1       anton     415:   }
                    416:   NEXT_P0;
                    417:   NEXT;
                    418: 
                    419:  dodoes:
                    420:   /* this assumes the following structure:
                    421:      defining-word:
                    422:      
                    423:      ...
                    424:      DOES>
                    425:      (possible padding)
                    426:      possibly handler: jmp dodoes
                    427:      (possible branch delay slot(s))
                    428:      Forth code after DOES>
                    429:      
                    430:      defined word:
                    431:      
                    432:      cfa: address of or jump to handler OR
                    433:           address of or jump to dodoes, address of DOES-code
                    434:      pfa:
                    435:      
                    436:      */
                    437:   {
                    438:     DOCFA;
                    439: 
                    440:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
                    441: #ifdef DEBUG
                    442:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
                    443:     fflush(stderr);
                    444: #endif
                    445:     *--rp = (Cell)ip;
                    446:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    447: #ifdef USE_TOS
                    448:     *sp-- = TOS;
                    449:     TOS = (Cell)PFA(cfa);
                    450: #else
                    451:     *--sp = (Cell)PFA(cfa);
                    452: #endif
1.11      anton     453:     SET_IP(DOES_CODE1(cfa));
1.1       anton     454:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", TOS, IP);*/
                    455:   }
                    456:   NEXT;
                    457: 
                    458: #include "prim.i"
                    459: }

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