File:  [gforth] / gforth / engine / engine.c
Revision 1.59: download - view: text, annotated - select for diffs
Sun Jan 26 21:01:51 2003 UTC (17 years, 4 months ago) by anton
Branches: MAIN
CVS tags: HEAD
removed engine/memcmpc.c (now in support.c)
removed unused stuff

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

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