Annotation of gforth/engine.c, revision 1.8

1.1       anton       1: /*
1.8     ! pazsan      2:   $Id: engine.c,v 1.7 1994/06/01 10:05:15 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>
1.8     ! pazsan     17: #include <unistd.h>
1.1       anton      18: #include "forth.h"
                     19: #include "io.h"
                     20: 
                     21: typedef union {
                     22:   struct {
                     23: #ifdef BIG_ENDIAN
                     24:     Cell high;
                     25:     Cell low;
                     26: #else
                     27:     Cell low;
                     28:     Cell high;
                     29: #endif;
                     30:   } cells;
                     31:   DCell dcell;
                     32: } Double_Store;
                     33: 
                     34: typedef struct F83Name {
                     35:   struct F83Name       *next;  /* the link field for old hands */
                     36:   char                 countetc;
                     37:   Char                 name[0];
                     38: } F83Name;
                     39: 
                     40: /* are macros for setting necessary? */
                     41: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
                     42: #define F83NAME_SMUDGE(np)     (((np)->countetc & 0x40) != 0)
                     43: #define F83NAME_IMMEDIATE(np)  (((np)->countetc & 0x20) != 0)
                     44: 
                     45: /* NEXT and NEXT1 are split into several parts to help scheduling */
                     46: #ifdef DIRECT_THREADED
1.4       pazsan     47: #      define NEXT1_P1 
                     48: #      define NEXT1_P2 ({goto *cfa;})
                     49: #      define DEF_CA
1.1       anton      50: #else
1.4       pazsan     51: #      define NEXT1_P1 ({ca = *cfa;})
                     52: #      define NEXT1_P2 ({goto *ca;})
                     53: #      define DEF_CA   Label ca;
1.1       anton      54: #endif
                     55: #define NEXT_P1 ({cfa = *ip++; NEXT1_P1;})
                     56: 
1.4       pazsan     57: #define NEXT1 ({DEF_CA NEXT1_P1; NEXT1_P2;})
                     58: #define NEXT ({DEF_CA NEXT_P1; NEXT1_P2;})
1.1       anton      59: 
                     60: #ifdef USE_TOS
                     61: #define IF_TOS(x) x
                     62: #else
                     63: #define IF_TOS(x)
                     64: #define TOS (sp[0])
                     65: #endif
                     66: 
                     67: #ifdef USE_FTOS
                     68: #define IF_FTOS(x) x
                     69: #else
                     70: #define IF_FTOS(x)
                     71: #define FTOS (fp[0])
                     72: #endif
                     73: 
                     74: int emitcounter;
                     75: #define NULLC '\0'
                     76: 
1.3       pazsan     77: #define cstr(to,from,size)\
                     78:        {       memcpy(to,from,size);\
1.1       anton      79:                to[size]=NULLC;}
                     80: #define NEWLINE        '\n'
                     81: 
                     82: static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
1.6       pazsan     83: 
1.5       anton      84: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp)
1.1       anton      85: /* executes code at ip, if ip!=NULL
                     86:    returns array of machine code labels (for use in a loader), if ip==NULL
                     87: */
                     88: {
                     89:   Xt cfa;
1.4       pazsan     90:   Address up=NULL;
1.1       anton      91:   static Label symbols[]= {
                     92:     &&docol,
                     93:     &&docon,
                     94:     &&dovar,
1.4       pazsan     95:     &&douser,
1.1       anton      96:     &&dodoes,
1.6       pazsan     97:     &&dodoes,  /* dummy for does handler address */
1.1       anton      98: #include "prim_labels.i"
                     99:   };
                    100:   IF_TOS(register Cell TOS;)
                    101:   IF_FTOS(Float FTOS;)
                    102: #ifdef CPU_DEP
                    103:   CPU_DEP;
                    104: #endif
                    105: 
                    106:   if (ip == NULL)
                    107:     return symbols;
                    108:   
                    109:   IF_TOS(TOS = sp[0]);
                    110:   IF_FTOS(FTOS = fp[0]);
                    111:   prep_terminal();
                    112:   NEXT;
                    113:   
                    114:  docol:
                    115: #ifdef DEBUG
1.6       pazsan    116:   printf("%08x: col: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     117: #endif
                    118: #ifdef undefined
                    119:   /* this is the simple version */
                    120:   *--rp = (Cell)ip;
                    121:   ip = (Xt *)PFA1(cfa);
                    122:   NEXT;
                    123: #endif
                    124:   /* this one is important, so we help the compiler optimizing
                    125:      The following version may be better (for scheduling), but probably has
                    126:      problems with code fields employing calls and delay slots
                    127:   */
                    128:   {
1.4       pazsan    129:     DEF_CA
1.1       anton     130:     Xt *current_ip = (Xt *)PFA1(cfa);
                    131:     cfa = *current_ip;
                    132:     NEXT1_P1;
                    133:     *--rp = (Cell)ip;
                    134:     ip = current_ip+1;
1.3       pazsan    135:     NEXT1_P2;
1.1       anton     136:   }
                    137:   
                    138:  docon:
                    139: #ifdef DEBUG
1.6       pazsan    140:   printf("%08x: con: %08x\n",(Cell)ip,*(Cell*)PFA1(cfa));
1.1       anton     141: #endif
                    142: #ifdef USE_TOS
                    143:   *sp-- = TOS;
                    144:   TOS = *(Cell *)PFA1(cfa);
                    145: #else
                    146:   *--sp = *(Cell *)PFA1(cfa);
                    147: #endif
                    148:   NEXT;
                    149:   
                    150:  dovar:
                    151: #ifdef DEBUG
1.6       pazsan    152:   printf("%08x: var: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
1.1       anton     153: #endif
                    154: #ifdef USE_TOS
                    155:   *sp-- = TOS;
                    156:   TOS = (Cell)PFA1(cfa);
                    157: #else
                    158:   *--sp = (Cell)PFA1(cfa);
                    159: #endif
                    160:   NEXT;
                    161:   
                    162:   /* !! user? */
                    163:   
1.4       pazsan    164:  douser:
                    165: #ifdef DEBUG
1.6       pazsan    166:   printf("%08x: user: %08x\n",(Cell)ip,(Cell)PFA1(cfa));
1.4       pazsan    167: #endif
                    168: #ifdef USE_TOS
                    169:   *sp-- = TOS;
1.5       anton     170:   TOS = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    171: #else
1.5       anton     172:   *--sp = (Cell)(up+*(Cell*)PFA1(cfa));
1.4       pazsan    173: #endif
                    174:   NEXT;
                    175:   
1.1       anton     176:  dodoes:
                    177:   /* this assumes the following structure:
                    178:      defining-word:
                    179:      
                    180:      ...
                    181:      DOES>
                    182:      (possible padding)
                    183:      possibly handler: jmp dodoes
                    184:      (possible branch delay slot(s))
                    185:      Forth code after DOES>
                    186:      
                    187:      defined word:
                    188:      
                    189:      cfa: address of or jump to handler OR
                    190:           address of or jump to dodoes, address of DOES-code
                    191:      pfa:
                    192:      
                    193:      */
                    194: #ifdef DEBUG
1.6       pazsan    195:   printf("%08x/%08x: does: %08x\n",(Cell)ip,(Cell)cfa,*(Cell)PFA(cfa));
                    196:   fflush(stdout);
1.1       anton     197: #endif
                    198:   *--rp = (Cell)ip;
                    199:   /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    200: #ifdef USE_TOS
                    201:   *sp-- = TOS;
                    202:   TOS = (Cell)PFA(cfa);
                    203: #else
                    204:   *--sp = (Cell)PFA(cfa);
                    205: #endif
                    206:   ip = DOES_CODE1(cfa);
                    207:   NEXT;
                    208:   
                    209: #include "primitives.i"
                    210: }

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