File:  [gforth] / gforth / Attic / engine.c
Revision 1.12: download - view: text, annotated - select for diffs
Thu Aug 25 15:25:21 1994 UTC (26 years, 11 months ago) by anton
Branches: MAIN
CVS tags: HEAD
make now generates both images
the image names were changed
added C-level support for deferred words (dodefer)
made 2>r 2r> 2r@ 2rdrop primitives
some tuning of the outer interpreter; eliminated many words based on
 counted strings
Replaced the hash function with one that works better for larger tables

    1: /*
    2:   $Id: engine.c,v 1.12 1994/08/25 15:25:21 anton Exp $
    3:   Copyright 1992 by the ANSI figForth Development Group
    4: */
    5: 
    6: #include <ctype.h>
    7: #include <stdio.h>
    8: #include <string.h>
    9: #include <math.h>
   10: #include <sys/types.h>
   11: #include <sys/stat.h>
   12: #include <fcntl.h>
   13: #include <assert.h>
   14: #include <stdlib.h>
   15: #include <time.h>
   16: #include <sys/time.h>
   17: #include "forth.h"
   18: #include "io.h"
   19: 
   20: typedef union {
   21:   struct {
   22: #ifdef BIG_ENDIAN
   23:     Cell high;
   24:     Cell low;
   25: #else
   26:     Cell low;
   27:     Cell high;
   28: #endif;
   29:   } cells;
   30:   DCell dcell;
   31: } Double_Store;
   32: 
   33: typedef struct F83Name {
   34:   struct F83Name	*next;  /* the link field for old hands */
   35:   char			countetc;
   36:   Char			name[0];
   37: } F83Name;
   38: 
   39: /* are macros for setting necessary? */
   40: #define F83NAME_COUNT(np)	((np)->countetc & 0x1f)
   41: #define F83NAME_SMUDGE(np)	(((np)->countetc & 0x40) != 0)
   42: #define F83NAME_IMMEDIATE(np)	(((np)->countetc & 0x20) != 0)
   43: 
   44: /* NEXT and NEXT1 are split into several parts to help scheduling */
   45: #ifdef DIRECT_THREADED
   46: #	define NEXT1_P1 
   47: #	define NEXT1_P2 ({goto *cfa;})
   48: #	define DEF_CA
   49: #else
   50: #	define NEXT1_P1 ({ca = *cfa;})
   51: #	define NEXT1_P2 ({goto *ca;})
   52: #	define DEF_CA	Label ca;
   53: #endif
   54: #define NEXT_P1 ({cfa = *ip++; NEXT1_P1;})
   55: 
   56: #define NEXT1 ({DEF_CA NEXT1_P1; NEXT1_P2;})
   57: #define NEXT ({DEF_CA NEXT_P1; NEXT1_P2;})
   58: 
   59: #ifdef USE_TOS
   60: #define IF_TOS(x) x
   61: #else
   62: #define IF_TOS(x)
   63: #define TOS (sp[0])
   64: #endif
   65: 
   66: #ifdef USE_FTOS
   67: #define IF_FTOS(x) x
   68: #else
   69: #define IF_FTOS(x)
   70: #define FTOS (fp[0])
   71: #endif
   72: 
   73: int emitcounter;
   74: #define NULLC '\0'
   75: 
   76: #define cstr(to,from,size)\
   77: 	{	memcpy(to,from,size);\
   78: 		to[size]=NULLC;}
   79: #define NEWLINE	'\n'
   80: 
   81: static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
   82: 
   83: static Address up0=NULL;
   84: 
   85: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp)
   86: /* executes code at ip, if ip!=NULL
   87:    returns array of machine code labels (for use in a loader), if ip==NULL
   88: */
   89: {
   90:   Xt cfa;
   91:   Address up=up0;
   92:   static Label symbols[]= {
   93:     &&docol,
   94:     &&docon,
   95:     &&dovar,
   96:     &&douser,
   97:     &&dodefer,
   98:     &&dodoes,
   99:     &&dodoes,  /* dummy for does handler address */
  100: #include "prim_labels.i"
  101:   };
  102:   IF_TOS(register Cell TOS;)
  103:   IF_FTOS(Float FTOS;)
  104: #ifdef CPU_DEP
  105:   CPU_DEP;
  106: #endif
  107: 
  108:   if (ip == NULL)
  109:     return symbols;
  110: 
  111:   IF_TOS(TOS = sp[0]);
  112:   IF_FTOS(FTOS = fp[0]);
  113:   prep_terminal();
  114:   NEXT;
  115:   
  116:  docol:
  117: #ifdef DEBUG
  118:   printf("%08x: col: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
  119: #endif
  120: #ifdef undefined
  121:   /* this is the simple version */
  122:   *--rp = (Cell)ip;
  123:   ip = (Xt *)PFA1(cfa);
  124:   NEXT;
  125: #endif
  126:   /* this one is important, so we help the compiler optimizing
  127:      The following version may be better (for scheduling), but probably has
  128:      problems with code fields employing calls and delay slots
  129:   */
  130:   {
  131:     DEF_CA
  132:     Xt *current_ip = (Xt *)PFA1(cfa);
  133:     cfa = *current_ip;
  134:     NEXT1_P1;
  135:     *--rp = (Cell)ip;
  136:     ip = current_ip+1;
  137:     NEXT1_P2;
  138:   }
  139:   
  140:  docon:
  141: #ifdef DEBUG
  142:   printf("%08x: con: %08x\n",(Cell)ip,*(Cell*)PFA1(cfa));
  143: #endif
  144: #ifdef USE_TOS
  145:   *sp-- = TOS;
  146:   TOS = *(Cell *)PFA1(cfa);
  147: #else
  148:   *--sp = *(Cell *)PFA1(cfa);
  149: #endif
  150:   NEXT;
  151:   
  152:  dovar:
  153: #ifdef DEBUG
  154:   printf("%08x: var: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
  155: #endif
  156: #ifdef USE_TOS
  157:   *sp-- = TOS;
  158:   TOS = (Cell)PFA1(cfa);
  159: #else
  160:   *--sp = (Cell)PFA1(cfa);
  161: #endif
  162:   NEXT;
  163:   
  164:   /* !! user? */
  165:   
  166:  douser:
  167: #ifdef DEBUG
  168:   printf("%08x: user: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
  169: #endif
  170: #ifdef USE_TOS
  171:   *sp-- = TOS;
  172:   TOS = (Cell)(up+*(Cell*)PFA1(cfa));
  173: #else
  174:   *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
  175: #endif
  176:   NEXT;
  177:   
  178:  dodefer:
  179: #ifdef DEBUG
  180:   printf("%08x: defer: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
  181: #endif
  182:   cfa = *(Xt *)PFA1(cfa);
  183:   NEXT1;
  184: 
  185:  dodoes:
  186:   /* this assumes the following structure:
  187:      defining-word:
  188:      
  189:      ...
  190:      DOES>
  191:      (possible padding)
  192:      possibly handler: jmp dodoes
  193:      (possible branch delay slot(s))
  194:      Forth code after DOES>
  195:      
  196:      defined word:
  197:      
  198:      cfa: address of or jump to handler OR
  199:           address of or jump to dodoes, address of DOES-code
  200:      pfa:
  201:      
  202:      */
  203: #ifdef DEBUG
  204:   printf("%08x/%08x: does: %08x\n",(Cell)ip,(Cell)cfa,*(Cell)PFA(cfa));
  205:   fflush(stdout);
  206: #endif
  207:   *--rp = (Cell)ip;
  208:   /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
  209: #ifdef USE_TOS
  210:   *sp-- = TOS;
  211:   TOS = (Cell)PFA(cfa);
  212: #else
  213:   *--sp = (Cell)PFA(cfa);
  214: #endif
  215:   ip = DOES_CODE1(cfa);
  216:   NEXT;
  217:   
  218: #include "primitives.i"
  219: }

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>