Annotation of gforth/engine.c, revision 1.12

1.1       anton       1: /*
1.12    ! anton       2:   $Id: engine.c,v 1.11 1994/07/13 19:21:02 pazsan Exp $
1.1       anton       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>
1.2       pazsan     15: #include <time.h>
1.6       pazsan     16: #include <sys/time.h>
1.1       anton      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
1.4       pazsan     46: #      define NEXT1_P1 
                     47: #      define NEXT1_P2 ({goto *cfa;})
                     48: #      define DEF_CA
1.1       anton      49: #else
1.4       pazsan     50: #      define NEXT1_P1 ({ca = *cfa;})
                     51: #      define NEXT1_P2 ({goto *ca;})
                     52: #      define DEF_CA   Label ca;
1.1       anton      53: #endif
                     54: #define NEXT_P1 ({cfa = *ip++; NEXT1_P1;})
                     55: 
1.4       pazsan     56: #define NEXT1 ({DEF_CA NEXT1_P1; NEXT1_P2;})
                     57: #define NEXT ({DEF_CA NEXT_P1; NEXT1_P2;})
1.1       anton      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: 
1.3       pazsan     76: #define cstr(to,from,size)\
                     77:        {       memcpy(to,from,size);\
1.1       anton      78:                to[size]=NULLC;}
                     79: #define NEWLINE        '\n'
                     80: 
                     81: static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
1.6       pazsan     82: 
1.11      pazsan     83: static Address up0=NULL;
                     84: 
1.5       anton      85: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp)
1.1       anton      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;
1.11      pazsan     91:   Address up=up0;
1.1       anton      92:   static Label symbols[]= {
                     93:     &&docol,
                     94:     &&docon,
                     95:     &&dovar,
1.4       pazsan     96:     &&douser,
1.12    ! anton      97:     &&dodefer,
1.1       anton      98:     &&dodoes,
1.6       pazsan     99:     &&dodoes,  /* dummy for does handler address */
1.1       anton     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;
1.10      anton     110: 
1.1       anton     111:   IF_TOS(TOS = sp[0]);
                    112:   IF_FTOS(FTOS = fp[0]);
                    113:   prep_terminal();
                    114:   NEXT;
                    115:   
                    116:  docol:
                    117: #ifdef DEBUG
1.6       pazsan    118:   printf("%08x: col: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     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:   {
1.4       pazsan    131:     DEF_CA
1.1       anton     132:     Xt *current_ip = (Xt *)PFA1(cfa);
                    133:     cfa = *current_ip;
                    134:     NEXT1_P1;
                    135:     *--rp = (Cell)ip;
                    136:     ip = current_ip+1;
1.3       pazsan    137:     NEXT1_P2;
1.1       anton     138:   }
                    139:   
                    140:  docon:
                    141: #ifdef DEBUG
1.6       pazsan    142:   printf("%08x: con: %08x\n",(Cell)ip,*(Cell*)PFA1(cfa));
1.1       anton     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
1.6       pazsan    154:   printf("%08x: var: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     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:   
1.4       pazsan    166:  douser:
                    167: #ifdef DEBUG
1.6       pazsan    168:   printf("%08x: user: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
1.4       pazsan    169: #endif
                    170: #ifdef USE_TOS
                    171:   *sp-- = TOS;
1.5       anton     172:   TOS = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    173: #else
1.5       anton     174:   *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    175: #endif
                    176:   NEXT;
                    177:   
1.12    ! anton     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: 
1.1       anton     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
1.6       pazsan    204:   printf("%08x/%08x: does: %08x\n",(Cell)ip,(Cell)cfa,*(Cell)PFA(cfa));
                    205:   fflush(stdout);
1.1       anton     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: }

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