File:  [gforth] / gforth / engine / engine.c
Revision 1.54: download - view: text, annotated - select for diffs
Sat Dec 28 17:18:27 2002 UTC (17 years, 5 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
First inclusion of group-based primitive tokens (no reordering happend yet)

    1: /* Gforth virtual machine (aka inner interpreter)
    2: 
    3:   Copyright (C) 1995,1996,1997,1998,2000 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: */
   21: 
   22: #include "config.h"
   23: #include "forth.h"
   24: #include <ctype.h>
   25: #include <stdio.h>
   26: #include <string.h>
   27: #include <math.h>
   28: #include <assert.h>
   29: #include <stdlib.h>
   30: #include <errno.h>
   31: #include "io.h"
   32: #include "threaded.h"
   33: #ifndef STANDALONE
   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>
   41: #include <dirent.h>
   42: #include <sys/resource.h>
   43: #ifdef HAVE_FNMATCH_H
   44: #include <fnmatch.h>
   45: #else
   46: #include "fnmatch.h"
   47: #endif
   48: #else
   49: #include "systypes.h"
   50: #endif
   51: 
   52: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   53: #include <dlfcn.h>
   54: #endif
   55: #if defined(_WIN32)
   56: #include <windows.h>
   57: #endif
   58: #ifdef hpux
   59: #include <dl.h>
   60: #endif
   61: 
   62: #ifndef SEEK_SET
   63: /* should be defined in stdio.h, but some systems don't have it */
   64: #define SEEK_SET 0
   65: #endif
   66: 
   67: #ifndef HAVE_FSEEKO
   68: #define fseeko fseek
   69: #endif
   70: 
   71: #ifndef HAVE_FTELLO
   72: #define ftello ftell
   73: #endif
   74: 
   75: #define IOR(flag)	((flag)? -512-errno : 0)
   76: 
   77: struct F83Name {
   78:   struct F83Name *next;  /* the link field for old hands */
   79:   char		countetc;
   80:   char		name[0];
   81: };
   82: 
   83: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   84: 
   85: struct Longname {
   86:   struct Longname *next;  /* the link field for old hands */
   87:   Cell		countetc;
   88:   char		name[0];
   89: };
   90: 
   91: #define LONGNAME_COUNT(np)	((np)->countetc & (((~((UCell)0))<<3)>>3))
   92: 
   93: #define NULLC '\0'
   94: 
   95: #ifdef MEMCMP_AS_SUBROUTINE
   96: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
   97: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
   98: #endif
   99: 
  100: #define NEWLINE	'\n'
  101: 
  102: /* conversion on fetch */
  103: 
  104: #define vm_Cell2f(_cell,_x)		((_x)=(Bool)(_cell))
  105: #define vm_Cell2c(_cell,_x)		((_x)=(Char)(_cell))
  106: #define vm_Cell2n(_cell,_x)		((_x)=(Cell)(_cell))
  107: #define vm_Cell2w(_cell,_x)		((_x)=(Cell)(_cell))
  108: #define vm_Cell2u(_cell,_x)		((_x)=(UCell)(_cell))
  109: #define vm_Cell2a_(_cell,_x)		((_x)=(Cell *)(_cell))
  110: #define vm_Cell2c_(_cell,_x)		((_x)=(Char *)(_cell))
  111: #define vm_Cell2f_(_cell,_x)		((_x)=(Float *)(_cell))
  112: #define vm_Cell2df_(_cell,_x)		((_x)=(DFloat *)(_cell))
  113: #define vm_Cell2sf_(_cell,_x)		((_x)=(SFloat *)(_cell))
  114: #define vm_Cell2xt(_cell,_x)		((_x)=(Xt)(_cell))
  115: #define vm_Cell2f83name(_cell,_x)	((_x)=(struct F83Name *)(_cell))
  116: #define vm_Cell2longname(_cell,_x)	((_x)=(struct Longname *)(_cell))
  117: #define vm_Float2r(_float,_x)		(_x=_float)
  118: 
  119: /* conversion on store */
  120: 
  121: #define vm_f2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  122: #define vm_c2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  123: #define vm_n2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  124: #define vm_w2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  125: #define vm_u2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  126: #define vm_a_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  127: #define vm_c_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  128: #define vm_f_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  129: #define vm_df_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  130: #define vm_sf_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  131: #define vm_xt2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  132: #define vm_f83name2Cell(_x,_cell)	((_cell)=(Cell)(_x))
  133: #define vm_longname2Cell(_x,_cell)	((_cell)=(Cell)(_x))
  134: #define vm_r2Float(_x,_float)		(_float=_x)
  135: 
  136: #define vm_Cell2Cell(_x,_y)		(_y=_x)
  137: 
  138: #ifdef NO_IP
  139: #define IMM_ARG(access,value)		(VARIANT(value))
  140: #else
  141: #define IMM_ARG(access,value)		(access)
  142: #endif
  143: 
  144: /* if machine.h has not defined explicit registers, define them as implicit */
  145: #ifndef IPREG
  146: #define IPREG
  147: #endif
  148: #ifndef SPREG
  149: #define SPREG
  150: #endif
  151: #ifndef RPREG
  152: #define RPREG
  153: #endif
  154: #ifndef FPREG
  155: #define FPREG
  156: #endif
  157: #ifndef LPREG
  158: #define LPREG
  159: #endif
  160: #ifndef CFAREG
  161: #define CFAREG
  162: #endif
  163: #ifndef UPREG
  164: #define UPREG
  165: #endif
  166: #ifndef TOSREG
  167: #define TOSREG
  168: #endif
  169: #ifndef FTOSREG
  170: #define FTOSREG
  171: #endif
  172: 
  173: #ifndef CPU_DEP1
  174: # define CPU_DEP1 0
  175: #endif
  176: 
  177: /* instructions containing these must be the last instruction of a
  178:    super-instruction (e.g., branches, EXECUTE, and other instructions
  179:    ending the basic block). Instructions containing SET_IP get this
  180:    automatically, so you usually don't have to write it.  If you have
  181:    to write it, write it after IP points to the next instruction.
  182:    Used for profiling.  Don't write it in a word containing SET_IP, or
  183:    the following block will be counted twice. */
  184: #ifdef VM_PROFILING
  185: #define SUPER_END  vm_count_block(IP)
  186: #else
  187: #define SUPER_END
  188: #endif
  189: #define SUPER_CONTINUE
  190: 
  191: #ifdef DEBUG
  192: #define CFA_TO_NAME(__cfa) \
  193:       Cell len, i; \
  194:       char * name = __cfa; \
  195:       for(i=0; i<32; i+=sizeof(Cell)) { \
  196:         len = ((Cell*)name)[-1]; \
  197:         if(len < 0) { \
  198: 	  len &= 0x1F; \
  199:           if((len+sizeof(Cell)) > i) break; \
  200: 	} len = 0; \
  201: 	name -= sizeof(Cell); \
  202:       }
  203: #endif
  204: 
  205: #if !defined(ENGINE)
  206: /* normal engine */
  207: #define VARIANT(v)	(v)
  208: #define JUMP(target)	goto I_noop
  209: #define LABEL(name) J_##name: asm(""); I_##name:
  210: 
  211: #elif ENGINE==2
  212: /* variant with padding between VM instructions for finding out
  213:    cross-inst jumps (for dynamic code) */
  214: #define engine engine2
  215: #define VARIANT(v)	(v)
  216: #define JUMP(target)	goto I_noop
  217: #define LABEL(name) J_##name: SKIP16; I_##name:
  218: #define IN_ENGINE2
  219: 
  220: #elif ENGINE==3
  221: /* variant with different immediate arguments for finding out
  222:    immediate arguments (for native code) */
  223: #define engine engine3
  224: #define VARIANT(v)	((v)^0xffffffff)
  225: #define JUMP(target)	goto K_lit
  226: #define LABEL(name) J_##name: asm(""); I_##name:
  227: #else
  228: #error illegal ENGINE value
  229: #endif /* ENGINE */
  230: 
  231: #define LABEL2(name) K_##name:
  232: 
  233: 
  234: Label *engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0)
  235: /* executes code at ip, if ip!=NULL
  236:    returns array of machine code labels (for use in a loader), if ip==NULL
  237: */
  238: {
  239: #ifndef GFORTH_DEBUGGING
  240:   register Cell *rp RPREG;
  241: #endif
  242: #ifndef NO_IP
  243:   register Xt *ip IPREG = ip0;
  244: #endif
  245:   register Cell *sp SPREG = sp0;
  246:   register Float *fp FPREG = fp0;
  247:   register Address lp LPREG = lp0;
  248:   register Xt cfa CFAREG;
  249: #ifdef MORE_VARS
  250:   MORE_VARS
  251: #endif
  252:   register Address up UPREG = UP;
  253:   IF_spTOS(register Cell spTOS TOSREG;)
  254:   IF_fpTOS(register Float fpTOS FTOSREG;)
  255: #if defined(DOUBLY_INDIRECT)
  256:   static Label *symbols;
  257:   static void *routines[]= {
  258: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  259: #else /* !defined(DOUBLY_INDIRECT) */
  260:   static Label symbols[]= {
  261: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
  262: #endif /* !defined(DOUBLY_INDIRECT) */
  263:     (Label)&&docol,
  264:     (Label)&&docon,
  265:     (Label)&&dovar,
  266:     (Label)&&douser,
  267:     (Label)&&dodefer,
  268:     (Label)&&dofield,
  269:     (Label)&&dodoes,
  270:     /* the following entry is normally unused;
  271:        it is there because its index indicates a does-handler */
  272:     CPU_DEP1,
  273: #define INST_ADDR(name) (Label)&&I_##name,
  274: #include "prim_lab.i"
  275: #undef INST_ADDR
  276:     (Label)&&after_last,
  277:     (Label)0,
  278: #define INST_ADDR(name) (Label)&&K_##name,
  279: #include "prim_lab.i"
  280: #undef INST_ADDR
  281: #define INST_ADDR(name) (Label)&&J_##name,
  282: #include "prim_lab.i"
  283: #undef INST_ADDR
  284:   };
  285: #ifdef CPU_DEP2
  286:   CPU_DEP2
  287: #endif
  288: 
  289:   rp = rp0;
  290: #ifdef DEBUG
  291:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  292:           (unsigned)ip0,(unsigned)sp,(unsigned)rp,
  293: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  294: #endif
  295: 
  296:   if (ip0 == NULL) {
  297: #if defined(DOUBLY_INDIRECT)
  298: #define CODE_OFFSET (26*sizeof(Cell))
  299: #define XT_OFFSET (22*sizeof(Cell))
  300:     int i;
  301:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  302:     Cell xt_offset = offset_image? XT_OFFSET : 0;
  303: 
  304:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  305:     xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
  306:     for (i=0; i<DOESJUMP+1; i++)
  307:       xts[i] = symbols[i] = (Label)routines[i];
  308:     for (; routines[i]!=0; i++) {
  309:       if (i>=MAX_SYMBOLS) {
  310: 	fprintf(stderr,"gforth-ditc: more than %d primitives\n",MAX_SYMBOLS);
  311: 	exit(1);
  312:       }
  313:       xts[i] = symbols[i] = &routines[i];
  314:     }
  315: #endif /* defined(DOUBLY_INDIRECT) */
  316:     return symbols;
  317:   }
  318: 
  319:   IF_spTOS(spTOS = sp[0]);
  320:   IF_fpTOS(fpTOS = fp[0]);
  321: /*  prep_terminal(); */
  322: #ifdef NO_IP
  323:   goto *(*(Label *)ip0);
  324: #else
  325:   SET_IP(ip);
  326:   SUPER_END; /* count the first block, too */
  327:   NEXT;
  328: #endif
  329: 
  330: #ifdef CPU_DEP3
  331:   CPU_DEP3
  332: #endif
  333:   
  334:  docol:
  335:   {
  336: #ifdef NO_IP
  337:     *--rp = next_code;
  338:     goto **(Label *)PFA1(cfa);
  339: #else
  340: #ifdef DEBUG
  341:     {
  342:       CFA_TO_NAME(cfa);
  343:       fprintf(stderr,"%08lx: col: %08lx %.*s\n",(Cell)ip,(Cell)PFA1(cfa),
  344: 	      len,name);
  345:     }
  346: #endif
  347: #ifdef CISC_NEXT
  348:     /* this is the simple version */
  349:     *--rp = (Cell)ip;
  350:     SET_IP((Xt *)PFA1(cfa));
  351:     SUPER_END;
  352:     NEXT;
  353: #else
  354:     /* this one is important, so we help the compiler optimizing */
  355:     {
  356:       DEF_CA
  357:       rp[-1] = (Cell)ip;
  358:       SET_IP((Xt *)PFA1(cfa));
  359:       SUPER_END;
  360:       NEXT_P1;
  361:       rp--;
  362:       NEXT_P2;
  363:     }
  364: #endif
  365: #endif
  366:   }
  367: 
  368:  docon:
  369:   {
  370: #ifdef DEBUG
  371:     fprintf(stderr,"%08lx: con: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  372: #endif
  373: #ifdef USE_TOS
  374:     *sp-- = spTOS;
  375:     spTOS = *(Cell *)PFA1(cfa);
  376: #else
  377:     *--sp = *(Cell *)PFA1(cfa);
  378: #endif
  379:   }
  380: #ifdef NO_IP
  381:   goto *next_code;
  382: #else
  383:   NEXT_P0;
  384:   NEXT;
  385: #endif
  386:   
  387:  dovar:
  388:   {
  389: #ifdef DEBUG
  390:     fprintf(stderr,"%08lx: var: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  391: #endif
  392: #ifdef USE_TOS
  393:     *sp-- = spTOS;
  394:     spTOS = (Cell)PFA1(cfa);
  395: #else
  396:     *--sp = (Cell)PFA1(cfa);
  397: #endif
  398:   }
  399: #ifdef NO_IP
  400:   goto *next_code;
  401: #else
  402:   NEXT_P0;
  403:   NEXT;
  404: #endif
  405:   
  406:  douser:
  407:   {
  408: #ifdef DEBUG
  409:     fprintf(stderr,"%08lx: user: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  410: #endif
  411: #ifdef USE_TOS
  412:     *sp-- = spTOS;
  413:     spTOS = (Cell)(up+*(Cell*)PFA1(cfa));
  414: #else
  415:     *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  416: #endif
  417:   }
  418: #ifdef NO_IP
  419:   goto *next_code;
  420: #else
  421:   NEXT_P0;
  422:   NEXT;
  423: #endif
  424:   
  425:  dodefer:
  426:   {
  427: #ifdef DEBUG
  428:     fprintf(stderr,"%08lx: defer: %08lx\n",(Cell)ip,*(Cell*)PFA1(cfa));
  429: #endif
  430:     SUPER_END;
  431:     EXEC(*(Xt *)PFA1(cfa));
  432:   }
  433: 
  434:  dofield:
  435:   {
  436: #ifdef DEBUG
  437:     fprintf(stderr,"%08lx: field: %08lx\n",(Cell)ip,(Cell)PFA1(cfa));
  438: #endif
  439:     spTOS += *(Cell*)PFA1(cfa);
  440:   }
  441: #ifdef NO_IP
  442:   goto *next_code;
  443: #else
  444:   NEXT_P0;
  445:   NEXT;
  446: #endif
  447: 
  448:  dodoes:
  449:   /* this assumes the following structure:
  450:      defining-word:
  451:      
  452:      ...
  453:      DOES>
  454:      (possible padding)
  455:      possibly handler: jmp dodoes
  456:      (possible branch delay slot(s))
  457:      Forth code after DOES>
  458:      
  459:      defined word:
  460:      
  461:      cfa: address of or jump to handler OR
  462:           address of or jump to dodoes, address of DOES-code
  463:      pfa:
  464:      
  465:      */
  466: #ifdef NO_IP
  467:   *--rp = next_code;
  468:   IF_spTOS(spTOS = sp[0]);
  469:   sp--;
  470:   spTOS = (Cell)PFA(cfa);
  471:   goto **(Label *)DOES_CODE1(cfa);
  472: #else
  473:   {
  474:     /*    fprintf(stderr, "Got CFA %08lx at doescode %08lx/%08lx: does: %08lx\n",cfa,(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));*/
  475: #ifdef DEBUG
  476:     fprintf(stderr,"%08lx/%08lx: does: %08lx\n",(Cell)ip,(Cell)PFA(cfa),(Cell)DOES_CODE1(cfa));
  477:     fflush(stderr);
  478: #endif
  479:     *--rp = (Cell)ip;
  480:     /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  481: #ifdef USE_TOS
  482:     *sp-- = spTOS;
  483:     spTOS = (Cell)PFA(cfa);
  484: #else
  485:     *--sp = (Cell)PFA(cfa);
  486: #endif
  487:     SET_IP(DOES_CODE1(cfa));
  488:     SUPER_END;
  489:     /*    fprintf(stderr,"TOS = %08lx, IP=%08lx\n", spTOS, IP);*/
  490:   }
  491:   NEXT;
  492: #endif
  493: 
  494: #include "prim.i"
  495:   after_last: return (Label *)0;
  496:   /*needed only to get the length of the last primitive */
  497: }

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