File:  [gforth] / gforth / engine / engine.c
Revision 1.109: download - view: text, annotated - select for diffs
Tue Jul 15 16:11:49 2008 UTC (11 years, 10 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright years
updated copyright-blacklist (added libltdl)
updated distributed files (don't distribute files without distribution terms)
added copyright to preforth.in and build-ec.in

    1: /* Gforth virtual machine (aka inner interpreter)
    2: 
    3:   Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008 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 3
   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, see http://www.gnu.org/licenses/.
   19: */
   20: 
   21: #if defined(GFORTH_DEBUGGING) || defined(INDIRECT_THREADED) || defined(DOUBLY_INDIRECT) || defined(VM_PROFILING)
   22: #define USE_NO_TOS
   23: #else
   24: #define USE_TOS
   25: #endif
   26: 
   27: #include "config.h"
   28: #include "forth.h"
   29: #include <ctype.h>
   30: #include <stdio.h>
   31: #include <string.h>
   32: #include <math.h>
   33: #include <assert.h>
   34: #include <stdlib.h>
   35: #include <errno.h>
   36: #include "io.h"
   37: #include "threaded.h"
   38: #ifndef STANDALONE
   39: #include <sys/types.h>
   40: #include <sys/stat.h>
   41: #include <fcntl.h>
   42: #include <time.h>
   43: #include <sys/time.h>
   44: #include <unistd.h>
   45: #include <pwd.h>
   46: #include <dirent.h>
   47: #include <wchar.h>
   48: #include <sys/resource.h>
   49: #ifdef HAVE_FNMATCH_H
   50: #include <fnmatch.h>
   51: #else
   52: #include "fnmatch.h"
   53: #endif
   54: #else
   55: /* #include <systypes.h> */
   56: #endif
   57: 
   58: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN) /* what else? */
   59: #include <dlfcn.h>
   60: #endif
   61: #if defined(_WIN32)
   62: #include <windows.h>
   63: #endif
   64: #ifdef hpux
   65: #include <dl.h>
   66: #endif
   67: 
   68: #ifdef HAS_FFCALL
   69: #include <avcall.h>
   70: #include <callback.h>
   71: #endif
   72: 
   73: #ifndef SEEK_SET
   74: /* should be defined in stdio.h, but some systems don't have it */
   75: #define SEEK_SET 0
   76: #endif
   77: 
   78: #ifndef HAVE_FSEEKO
   79: #define fseeko fseek
   80: #endif
   81: 
   82: #ifndef HAVE_FTELLO
   83: #define ftello ftell
   84: #endif
   85: 
   86: #define NULLC '\0'
   87: 
   88: #ifdef MEMCMP_AS_SUBROUTINE
   89: extern int gforth_memcmp(const char * s1, const char * s2, size_t n);
   90: #define memcmp(s1,s2,n) gforth_memcmp(s1,s2,n)
   91: #endif
   92: 
   93: #define NEWLINE	'\n'
   94: 
   95: /* These two flags control whether divisions are checked by software.
   96:    The CHECK_DIVISION_SW is for those cases where the event is a
   97:    division by zero or overflow on the C level, and might be reported
   98:    by hardware; we might check forr that in autoconf and set the
   99:    switch appropriately, but currently don't.  The CHECK_DIVISION flag
  100:    is for the other cases. */
  101: #ifdef GFORTH_DEBUGGING
  102: #define CHECK_DIVISION_SW 1
  103: #define CHECK_DIVISION 1
  104: #else
  105: #define CHECK_DIVISION_SW 0
  106: #define CHECK_DIVISION 0
  107: #endif
  108: 
  109: /* conversion on fetch */
  110: 
  111: #define vm_Cell2f(_cell,_x)		((_x)=(Bool)(_cell))
  112: #define vm_Cell2c(_cell,_x)		((_x)=(Char)(_cell))
  113: #define vm_Cell2n(_cell,_x)		((_x)=(Cell)(_cell))
  114: #define vm_Cell2w(_cell,_x)		((_x)=(Cell)(_cell))
  115: #define vm_Cell2u(_cell,_x)		((_x)=(UCell)(_cell))
  116: #define vm_Cell2a_(_cell,_x)		((_x)=(Cell *)(_cell))
  117: #define vm_Cell2c_(_cell,_x)		((_x)=(Char *)(_cell))
  118: #define vm_Cell2f_(_cell,_x)		((_x)=(Float *)(_cell))
  119: #define vm_Cell2df_(_cell,_x)		((_x)=(DFloat *)(_cell))
  120: #define vm_Cell2sf_(_cell,_x)		((_x)=(SFloat *)(_cell))
  121: #define vm_Cell2xt(_cell,_x)		((_x)=(Xt)(_cell))
  122: #define vm_Cell2f83name(_cell,_x)	((_x)=(struct F83Name *)(_cell))
  123: #define vm_Cell2longname(_cell,_x)	((_x)=(struct Longname *)(_cell))
  124: #define vm_Float2r(_float,_x)		(_x=_float)
  125: 
  126: /* conversion on store */
  127: 
  128: #define vm_f2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  129: #define vm_c2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  130: #define vm_n2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  131: #define vm_w2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  132: #define vm_u2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  133: #define vm_a_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  134: #define vm_c_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  135: #define vm_f_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  136: #define vm_df_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  137: #define vm_sf_2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  138: #define vm_xt2Cell(_x,_cell)		((_cell)=(Cell)(_x))
  139: #define vm_f83name2Cell(_x,_cell)	((_cell)=(Cell)(_x))
  140: #define vm_longname2Cell(_x,_cell)	((_cell)=(Cell)(_x))
  141: #define vm_r2Float(_x,_float)		(_float=_x)
  142: 
  143: #define vm_Cell2Cell(_x,_y)		(_y=_x)
  144: 
  145: #ifdef NO_IP
  146: #define IMM_ARG(access,value)		(VARIANT(value))
  147: #else
  148: #define IMM_ARG(access,value)		(access)
  149: #endif
  150: 
  151: /* if machine.h has not defined explicit registers, define them as implicit */
  152: #ifndef IPREG
  153: #define IPREG
  154: #endif
  155: #ifndef SPREG
  156: #define SPREG
  157: #endif
  158: #ifndef RPREG
  159: #define RPREG
  160: #endif
  161: #ifndef FPREG
  162: #define FPREG
  163: #endif
  164: #ifndef LPREG
  165: #define LPREG
  166: #endif
  167: #ifndef CAREG
  168: #define CAREG
  169: #endif
  170: #ifndef CFAREG
  171: #define CFAREG
  172: #endif
  173: #ifndef UPREG
  174: #define UPREG
  175: #endif
  176: #ifndef TOSREG
  177: #define TOSREG
  178: #endif
  179: #ifndef spbREG
  180: #define spbREG
  181: #endif
  182: #ifndef spcREG
  183: #define spcREG
  184: #endif
  185: #ifndef spdREG
  186: #define spdREG
  187: #endif
  188: #ifndef speREG
  189: #define speREG
  190: #endif
  191: #ifndef spfREG
  192: #define spfREG
  193: #endif
  194: #ifndef spgREG
  195: #define spgREG
  196: #endif
  197: #ifndef sphREG
  198: #define sphREG
  199: #endif
  200: #ifndef FTOSREG
  201: #define FTOSREG
  202: #endif
  203: 
  204: #ifndef CPU_DEP1
  205: # define CPU_DEP1 0
  206: #endif
  207: 
  208: /* instructions containing SUPER_END must be the last instruction of a
  209:    super-instruction (e.g., branches, EXECUTE, and other instructions
  210:    ending the basic block). Instructions containing SET_IP get this
  211:    automatically, so you usually don't have to write it.  If you have
  212:    to write it, write it after IP points to the next instruction.
  213:    Used for profiling.  Don't write it in a word containing SET_IP, or
  214:    the following block will be counted twice. */
  215: #ifdef VM_PROFILING
  216: #define SUPER_END  vm_count_block(IP)
  217: #else
  218: #define SUPER_END
  219: #endif
  220: #define SUPER_CONTINUE
  221: 
  222: #ifdef ASMCOMMENT
  223: /* an individualized asm statement so that (hopefully) gcc's optimizer
  224:    does not do cross-jumping */
  225: #define asmcomment(string) asm(ASMCOMMENT string)
  226: #else
  227: /* we don't know how to do an asm comment, so we just do an empty asm */
  228: #define asmcomment(string) asm("")
  229: #endif
  230: 
  231: #ifdef GFORTH_DEBUGGING
  232: #if DEBUG
  233: #define NAME(string) { saved_ip=ip; asmcomment(string); fprintf(stderr,"%08lx depth=%3ld tos=%016lx: "string"\n",(Cell)ip,sp0+3-sp,sp[0]);}
  234: #else /* !DEBUG */
  235: #define NAME(string) { saved_ip=ip; asm(""); }
  236: /* the asm here is to avoid reordering of following stuff above the
  237:    assignment; this is an old-style asm (no operands), and therefore
  238:    is treated like "asm volatile ..."; i.e., it prevents most
  239:    reorderings across itself.  We want the assignment above first,
  240:    because the stack loads may already cause a stack underflow. */
  241: #endif /* !DEBUG */
  242: #elif DEBUG
  243: #       define  NAME(string)    {Cell __depth=sp0+3-sp; int i; fprintf(stderr,"%08lx depth=%3ld: "string,(Cell)ip,sp0+3-sp); for (i=__depth-1; i>0; i--) fprintf(stderr, " $%lx",sp[i]); fprintf(stderr, " $%lx\n",spTOS); }
  244: #else
  245: #	define	NAME(string) asmcomment(string);
  246: #endif
  247: 
  248: #ifdef DEBUG
  249: #define CFA_TO_NAME(__cfa) \
  250:       Cell len, i; \
  251:       char * name = __cfa; \
  252:       for(i=0; i<32; i+=sizeof(Cell)) { \
  253:         len = ((Cell*)name)[-1]; \
  254:         if(len < 0) { \
  255: 	  len &= 0x1F; \
  256:           if((len+sizeof(Cell)) > i) break; \
  257: 	} len = 0; \
  258: 	name -= sizeof(Cell); \
  259:       }
  260: #endif
  261: 
  262: #ifdef STANDALONE
  263: jmp_buf throw_jmp_buf;
  264: 
  265: void throw(int code)
  266: {
  267:   longjmp(throw_jmp_buf,code); /* !! or use siglongjmp ? */
  268: }
  269: #endif
  270: 
  271: #if defined(HAS_FFCALL) || defined(HAS_LIBFFI)
  272: #define SAVE_REGS IF_fpTOS(fp[0]=fpTOS); gforth_SP=sp; gforth_FP=fp; gforth_RP=rp; gforth_LP=lp;
  273: #define REST_REGS sp=gforth_SP; fp=gforth_FP; rp=gforth_RP; lp=gforth_LP; IF_fpTOS(fpTOS=fp[0]);
  274: #endif
  275: 
  276: #if !defined(ENGINE)
  277: /* normal engine */
  278: #define VARIANT(v)	(v)
  279: #define JUMP(target)	goto I_noop
  280: #define LABEL(name) H_##name: asm(""); I_##name:
  281: #define LABEL3(name) J_##name: asm("");
  282: 
  283: #elif ENGINE==2
  284: /* variant with padding between VM instructions for finding out
  285:    cross-inst jumps (for dynamic code) */
  286: #define gforth_engine gforth_engine2
  287: #define VARIANT(v)	(v)
  288: #define JUMP(target)	goto I_noop
  289: #define LABEL(name) H_##name: SKIP16; I_##name:
  290: /* the SKIP16 after LABEL3 is there, because the ARM gcc may place
  291:    some constants after the final branch, and may refer to them from
  292:    the code before label3.  Since we don't copy the constants, we have
  293:    to make sure that such code is recognized as non-relocatable. */
  294: #define LABEL3(name) J_##name: SKIP16;
  295: 
  296: #elif ENGINE==3
  297: /* variant with different immediate arguments for finding out
  298:    immediate arguments (for native code) */
  299: #define gforth_engine gforth_engine3
  300: #define VARIANT(v)	((v)^0xffffffff)
  301: #define JUMP(target)	goto K_lit
  302: #define LABEL(name) H_##name: asm(""); I_##name:
  303: #define LABEL3(name) J_##name: asm("");
  304: #else
  305: #error illegal ENGINE value
  306: #endif /* ENGINE */
  307: 
  308: /* the asm(""); is there to get a stop compiled on Itanium */
  309: #define LABEL2(name) K_##name: asm("");
  310: 
  311: Label *gforth_engine(Xt *ip0, Cell *sp0, Cell *rp0, Float *fp0, Address lp0 sr_proto)
  312: /* executes code at ip, if ip!=NULL
  313:    returns array of machine code labels (for use in a loader), if ip==NULL
  314: */
  315: {
  316: #if defined(GFORTH_DEBUGGING)
  317: #if defined(GLOBALS_NONRELOC)
  318:   register saved_regs *saved_regs_p TOSREG = saved_regs_p0;
  319: #endif /* defined(GLOBALS_NONRELOC) */
  320: #else /* !defined(GFORTH_DEBUGGING) */
  321:   register Cell *rp RPREG;
  322: #endif /* !defined(GFORTH_DEBUGGING) */
  323: #ifndef NO_IP
  324:   register Xt *ip IPREG = ip0;
  325: #endif
  326:   register Cell *sp SPREG = sp0;
  327:   register Float *fp FPREG = fp0;
  328:   register Address lp LPREG = lp0;
  329:   register Xt cfa CFAREG;
  330:   register Label real_ca CAREG;
  331: #ifdef MORE_VARS
  332:   MORE_VARS
  333: #endif
  334: #ifdef HAS_FFCALL
  335:   av_alist alist;
  336:   extern va_alist gforth_clist;
  337:   float frv;
  338:   int irv;
  339:   double drv;
  340:   long long llrv;
  341:   void * prv;
  342: #endif
  343:   register Address up UPREG = gforth_UP;
  344: #if !defined(GFORTH_DEBUGGING)
  345:   register Cell MAYBE_UNUSED spTOS TOSREG;
  346:   register Cell MAYBE_UNUSED spb spbREG;
  347:   register Cell MAYBE_UNUSED spc spcREG;
  348:   register Cell MAYBE_UNUSED spd spdREG;
  349:   register Cell MAYBE_UNUSED spe speREG;
  350:   register Cell MAYBE_UNUSED spf speREG;
  351:   register Cell MAYBE_UNUSED spg speREG;
  352:   register Cell MAYBE_UNUSED sph speREG;
  353:   IF_fpTOS(register Float fpTOS FTOSREG;)
  354: #endif /* !defined(GFORTH_DEBUGGING) */
  355: #if defined(DOUBLY_INDIRECT)
  356:   static Label *symbols;
  357:   static void *routines[]= {
  358: #define MAX_SYMBOLS (sizeof(routines)/sizeof(routines[0]))
  359: #else /* !defined(DOUBLY_INDIRECT) */
  360:   static Label symbols[]= {
  361: #define MAX_SYMBOLS (sizeof(symbols)/sizeof(symbols[0]))
  362: #endif /* !defined(DOUBLY_INDIRECT) */
  363: #define INST_ADDR(name) ((Label)&&I_##name)
  364: #include PRIM_LAB_I
  365: #undef INST_ADDR
  366:     (Label)0,
  367: #define INST_ADDR(name) ((Label)&&K_##name)
  368: #include PRIM_LAB_I
  369: #undef INST_ADDR
  370: #define INST_ADDR(name) ((Label)&&J_##name)
  371: #include PRIM_LAB_I
  372: #undef INST_ADDR
  373:     (Label)&&after_last,
  374:     (Label)&&before_goto,
  375:     (Label)&&after_goto,
  376: /* just mention the H_ labels, so the SKIP16s are not optimized away */
  377: #define INST_ADDR(name) ((Label)&&H_##name)
  378: #include PRIM_LAB_I
  379: #undef INST_ADDR
  380:   };
  381: #ifdef STANDALONE
  382: #define INST_ADDR(name) ((Label)&&I_##name)
  383: #include "image.i"
  384: #undef INST_ADDR
  385: #endif
  386: #ifdef CPU_DEP2
  387:   CPU_DEP2
  388: #endif
  389: 
  390:   rp = rp0;
  391: #ifdef DEBUG
  392:   fprintf(stderr,"ip=%x, sp=%x, rp=%x, fp=%x, lp=%x, up=%x\n",
  393:           (unsigned)ip0,(unsigned)sp,(unsigned)rp,
  394: 	  (unsigned)fp,(unsigned)lp,(unsigned)up);
  395: #endif
  396: 
  397:   if (ip0 == NULL) {
  398: #if defined(DOUBLY_INDIRECT)
  399: #define CODE_OFFSET (26*sizeof(Cell))
  400: #define XT_OFFSET (22*sizeof(Cell))
  401:     int i;
  402:     Cell code_offset = offset_image? CODE_OFFSET : 0;
  403:     Cell xt_offset = offset_image? XT_OFFSET : 0;
  404: 
  405:     symbols = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+CODE_OFFSET)+code_offset);
  406:     xts = (Label *)(malloc(MAX_SYMBOLS*sizeof(Cell)+XT_OFFSET)+xt_offset);
  407:     for (i=0; i<DOESJUMP+1; i++)
  408:       xts[i] = symbols[i] = (Label)routines[i];
  409:     for (; routines[i]!=0; i++) {
  410:       if (i>=MAX_SYMBOLS) {
  411: 	fprintf(stderr,"gforth-ditc: more than %ld primitives\n",(long)MAX_SYMBOLS);
  412: 	exit(1);
  413:       }
  414:       xts[i] = symbols[i] = &routines[i];
  415:     }
  416: #endif /* defined(DOUBLY_INDIRECT) */
  417: #ifdef STANDALONE
  418:     return image;
  419: #else
  420:     return symbols;
  421: #endif
  422:   }
  423: 
  424: #if !(defined(GFORTH_DEBUGGING) || defined(INDIRECT_THREADED) || defined(DOUBLY_INDIRECT) || defined(VM_PROFILING))
  425:   sp += STACK_CACHE_DEFAULT-1;
  426:   /* some of those registers are dead, but its simpler to initialize them all */  spTOS = sp[0];
  427:   spb = sp[-1];
  428:   spc = sp[-2];
  429:   spd = sp[-3];
  430:   spe = sp[-4];
  431:   spf = sp[-5];
  432:   spg = sp[-6];
  433:   sph = sp[-7];
  434: #endif
  435: 
  436:   IF_fpTOS(fpTOS = fp[0]);
  437: /*  prep_terminal(); */
  438: #ifdef NO_IP
  439:   goto *(*(Label *)ip0);
  440:   before_goto:
  441:   goto *real_ca;
  442:   after_goto:;
  443: #else
  444:   SET_IP(ip);
  445:   SUPER_END; /* count the first block, too */
  446:   FIRST_NEXT;
  447: #endif
  448: 
  449: #ifdef CPU_DEP3
  450:   CPU_DEP3
  451: #endif
  452: 
  453: #include PRIM_I
  454:   after_last: return (Label *)0;
  455:   /*needed only to get the length of the last primitive */
  456: 
  457:   return (Label *)0;
  458: }

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