Annotation of gforth/engine.c, revision 1.2

1.1       anton       1: /*
                      2:   $Id: engine.c,v 1.17 1993/11/09 15:08:25 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>
1.2     ! pazsan     15: #include <time.h>
1.1       anton      16: #include "forth.h"
                     17: #include "io.h"
                     18: 
                     19: extern unlink(char *);
                     20: extern ftruncate(int, int);
                     21: 
                     22: typedef union {
                     23:   struct {
                     24: #ifdef BIG_ENDIAN
                     25:     Cell high;
                     26:     Cell low;
                     27: #else
                     28:     Cell low;
                     29:     Cell high;
                     30: #endif;
                     31:   } cells;
                     32:   DCell dcell;
                     33: } Double_Store;
                     34: 
                     35: typedef struct F83Name {
                     36:   struct F83Name       *next;  /* the link field for old hands */
                     37:   char                 countetc;
                     38:   Char                 name[0];
                     39: } F83Name;
                     40: 
                     41: /* are macros for setting necessary? */
                     42: #define F83NAME_COUNT(np)      ((np)->countetc & 0x1f)
                     43: #define F83NAME_SMUDGE(np)     (((np)->countetc & 0x40) != 0)
                     44: #define F83NAME_IMMEDIATE(np)  (((np)->countetc & 0x20) != 0)
                     45: 
                     46: /* NEXT and NEXT1 are split into several parts to help scheduling */
                     47: #ifdef DIRECT_THREADED
                     48: #define NEXT1_P1 
                     49: #define NEXT1_P2 ({goto *cfa;})
                     50: #else
                     51: #define NEXT1_P1 ({ca = *cfa;})
                     52: #define NEXT1_P2 ({goto *ca;})
                     53: #endif
                     54: #define NEXT_P1 ({cfa = *ip++; NEXT1_P1;})
                     55: 
                     56: #define NEXT1 ({NEXT1_P1; NEXT1_P2;})
                     57: #define NEXT ({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: #define DODOES (symbols[3])
                     74: 
                     75: int emitcounter;
                     76: #define NULLC '\0'
                     77: 
                     78: #define cstr(to, from, size)\
                     79:        {       memcpy(to, from, size);\
                     80:                to[size]=NULLC;}
                     81: #define NEWLINE        '\n'
                     82: 
                     83: static char* fileattr[6]={"r","rb","r+","r+b","w+","w+b"};
                     84: 
                     85: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp)
                     86: /* executes code at ip, if ip!=NULL
                     87:    returns array of machine code labels (for use in a loader), if ip==NULL
                     88:    This is very preliminary, as the bootstrap architecture is not yet decided
                     89: */
                     90: {
                     91:   Xt cfa;
                     92:   Address lp=NULL;
                     93:   static Label symbols[]= {
                     94:     &&docol,
                     95:     &&docon,
                     96:     &&dovar,
                     97:     &&dodoes,
                     98: #include "prim_labels.i"
                     99:   };
                    100: #ifndef DIRECT_THREADED
                    101:   Label ca;
                    102: #endif
                    103:   IF_TOS(register Cell TOS;)
                    104:   IF_FTOS(Float FTOS;)
                    105: #ifdef CPU_DEP
                    106:   CPU_DEP;
                    107: #endif
                    108: 
                    109:   if (ip == NULL)
                    110:     return symbols;
                    111:   
                    112:   IF_TOS(TOS = sp[0]);
                    113:   IF_FTOS(FTOS = fp[0]);
                    114:   prep_terminal();
                    115:   NEXT;
                    116:   
                    117:  docol:
                    118: #ifdef DEBUG
                    119:   printf("col: %x\n",(Cell)PFA1(cfa));
                    120: #endif
                    121: #ifdef undefined
                    122:   /* this is the simple version */
                    123:   *--rp = (Cell)ip;
                    124:   ip = (Xt *)PFA1(cfa);
                    125:   NEXT;
                    126: #endif
                    127:   /* this one is important, so we help the compiler optimizing
                    128:      The following version may be better (for scheduling), but probably has
                    129:      problems with code fields employing calls and delay slots
                    130:   */
                    131:   {
                    132:     Xt *current_ip = (Xt *)PFA1(cfa);
                    133:     cfa = *current_ip;
                    134:     NEXT1_P1;
                    135:     *--rp = (Cell)ip;
                    136:     ip = current_ip+1;
                    137:   }
                    138:   NEXT1_P2;
                    139:   
                    140:  docon:
                    141: #ifdef DEBUG
                    142:   printf("con: %x\n",*(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("var: %x\n",(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:  dodoes:
                    167:   /* this assumes the following structure:
                    168:      defining-word:
                    169:      
                    170:      ...
                    171:      DOES>
                    172:      (possible padding)
                    173:      possibly handler: jmp dodoes
                    174:      (possible branch delay slot(s))
                    175:      Forth code after DOES>
                    176:      
                    177:      defined word:
                    178:      
                    179:      cfa: address of or jump to handler OR
                    180:           address of or jump to dodoes, address of DOES-code
                    181:      pfa:
                    182:      
                    183:      */
                    184: #ifdef DEBUG
                    185:   printf("does: %x\n",(Cell)PFA(cfa));
                    186: #endif
                    187:   *--rp = (Cell)ip;
                    188:   /* PFA1 might collide with DOES_CODE1 here, so we use PFA */
                    189: #ifdef USE_TOS
                    190:   *sp-- = TOS;
                    191:   TOS = (Cell)PFA(cfa);
                    192: #else
                    193:   *--sp = (Cell)PFA(cfa);
                    194: #endif
                    195:   ip = DOES_CODE1(cfa);
                    196:   NEXT;
                    197:   
                    198: #include "primitives.i"
                    199: }

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