Annotation of gforth/engine/forth.h, revision 1.1
1.1 ! anton 1: /* common header file
! 2:
! 3: Copyright (C) 1995 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 2
! 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, write to the Free Software
! 19: Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
! 20: */
! 21:
! 22: #include "config.h"
! 23:
! 24: #if defined(DOUBLY_INDIRECT)
! 25: # undef DIRECT_THREADED
! 26: # undef INDIRECT_THREADED
! 27: # define INDIRECT_THREADED
! 28: #endif
! 29:
! 30: #include <limits.h>
! 31:
! 32: #if defined(NeXT)
! 33: # include <libc.h>
! 34: #endif /* NeXT */
! 35:
! 36: #if defined(DOUBLY_INDIRECT)
! 37: typedef void **Label;
! 38: #else /* !defined(DOUBLY_INDIRECT) */
! 39: typedef void *Label;
! 40: #endif /* !defined(DOUBLY_INDIRECT) */
! 41:
! 42: /* symbol indexed constants */
! 43:
! 44: #define DOCOL 0
! 45: #define DOCON 1
! 46: #define DOVAR 2
! 47: #define DOUSER 3
! 48: #define DODEFER 4
! 49: #define DOFIELD 5
! 50: #define DODOES 6
! 51: #define DOESJUMP 7
! 52:
! 53: /* the size of the DOESJUMP, which resides between DOES> and the does-code */
! 54: #define DOES_HANDLER_SIZE (2*sizeof(Cell))
! 55:
! 56: #include "../machine/machine.h"
! 57:
! 58: /* Forth data types */
! 59: /* Cell and UCell must be the same size as a pointer */
! 60: typedef CELL_TYPE Cell;
! 61: typedef unsigned CELL_TYPE UCell;
! 62: #define CELL_BITS (sizeof(Cell) * CHAR_BIT)
! 63: typedef Cell Bool;
! 64: #define FLAG(b) (-(b))
! 65: #define FILEIO(error) (FLAG(error) & -37)
! 66: #define FILEEXIST(error) (FLAG(error) & -38)
! 67:
! 68: #define F_TRUE (FLAG(0==0))
! 69: #define F_FALSE (FLAG(0!=0))
! 70:
! 71: typedef unsigned char Char;
! 72: typedef double Float;
! 73: typedef char *Address;
! 74:
! 75: #ifdef BUGGY_LONG_LONG
! 76: typedef struct {
! 77: Cell hi;
! 78: UCell lo;
! 79: } DCell;
! 80:
! 81: typedef struct {
! 82: UCell hi;
! 83: UCell lo;
! 84: } UDCell;
! 85:
! 86: #define FETCH_DCELL(d,lo,hi) ((d)=(typeof(d)){(hi),(lo)})
! 87: #define STORE_DCELL(d,low,high) ({ \
! 88: typeof(d) _d = (d); \
! 89: (low) = _d.lo; \
! 90: (high)= _d.hi; \
! 91: })
! 92:
! 93: #define LONG2UD(l) ({UDCell _ud; _ud.hi=0; _ud.lo=(Cell)(l); _ud;})
! 94: #define UD2LONG(ud) ((long)(ud.lo))
! 95: #define DZERO ((DCell){0,0})
! 96:
! 97: #else /* ! defined(BUGGY_LONG_LONG) */
! 98:
! 99: /* DCell and UDCell must be twice as large as Cell */
! 100: typedef DOUBLE_CELL_TYPE DCell;
! 101: typedef unsigned DOUBLE_CELL_TYPE UDCell;
! 102:
! 103: typedef union {
! 104: struct {
! 105: #ifdef WORDS_BIGENDIAN
! 106: Cell high;
! 107: UCell low;
! 108: #else
! 109: UCell low;
! 110: Cell high;
! 111: #endif;
! 112: } cells;
! 113: DCell dcell;
! 114: } Double_Store;
! 115:
! 116: #define FETCH_DCELL(d,lo,hi) ({ \
! 117: Double_Store _d; \
! 118: _d.cells.low = (lo); \
! 119: _d.cells.high = (hi); \
! 120: (d) = _d.dcell; \
! 121: })
! 122:
! 123: #define STORE_DCELL(d,lo,hi) ({ \
! 124: Double_Store _d; \
! 125: _d.dcell = (d); \
! 126: (lo) = _d.cells.low; \
! 127: (hi) = _d.cells.high; \
! 128: })
! 129:
! 130: #define LONG2UD(l) ((UDCell)(l))
! 131: #define UD2LONG(ud) ((long)(ud))
! 132: #define DZERO ((DCell)0)
! 133:
! 134: #endif /* ! defined(BUGGY_LONG_LONG) */
! 135:
! 136: #ifdef DIRECT_THREADED
! 137: typedef Label Xt;
! 138: #else
! 139: typedef Label *Xt;
! 140: #endif
! 141:
! 142:
! 143: #if !defined(DIRECT_THREADED)
! 144: /* i.e. indirect threaded our doubly indirect threaded */
! 145: /* the direct threaded version is machine dependent and resides in machine.h */
! 146:
! 147: /* PFA gives the parameter field address corresponding to a cfa */
! 148: #define PFA(cfa) (((Cell *)cfa)+2)
! 149: /* PFA1 is a special version for use just after a NEXT1 */
! 150: #define PFA1(cfa) PFA(cfa)
! 151: /* CODE_ADDRESS is the address of the code jumped to through the code field */
! 152: #define CODE_ADDRESS(cfa) (*(Xt)(cfa))
! 153:
! 154: /* DOES_CODE is the Forth code does jumps to */
! 155: #if !defined(DOUBLY_INDIRECT)
! 156: # define DOES_CA (symbols[DODOES])
! 157: #else /* defined(DOUBLY_INDIRECT) */
! 158: # define DOES_CA ((Label)&symbols[DODOES])
! 159: #endif /* defined(DOUBLY_INDIRECT) */
! 160:
! 161:
! 162:
! 163: #define DOES_CODE(cfa) ({Xt _cfa=(Xt)(cfa); \
! 164: (Xt *)(_cfa[0]==DOES_CA ? _cfa[1] : NULL);})
! 165: #define DOES_CODE1(cfa) ((Xt *)(cfa[1]))
! 166: /* MAKE_CF creates an appropriate code field at the cfa;
! 167: ca is the code address */
! 168: #define MAKE_CF(cfa,ca) ((*(Label *)(cfa)) = ((Label)ca))
! 169: /* make a code field for a defining-word-defined word */
! 170: #define MAKE_DOES_CF(cfa,does_code) ({MAKE_CF(cfa,DOES_CA); \
! 171: ((Cell *)cfa)[1] = (Cell)(does_code);})
! 172: /* the does handler resides between DOES> and the following Forth code */
! 173: /* not needed in indirect threaded code */
! 174: #if defined(DOUBLY_INDIRECT)
! 175: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr, ((Label)&symbols[DOESJUMP]))
! 176: #else /* !defined(DOUBLY_INDIRECT) */
! 177: #define MAKE_DOES_HANDLER(addr) 0
! 178: #endif /* !defined(DOUBLY_INDIRECT) */
! 179: #endif /* !defined(DIRECT_THREADED) */
! 180:
! 181: #ifdef DEBUG
! 182: # define NAME(string) fprintf(stderr,"%08lx: "string"\n",(Cell)ip);
! 183: #else
! 184: # define NAME(string)
! 185: #endif
! 186:
! 187: #define CF(const) (-const-2)
! 188:
! 189: #define CF_NIL -1
! 190:
! 191: #ifndef FLUSH_ICACHE
! 192: #warning flush-icache probably will not work (see manual)
! 193: # define FLUSH_ICACHE(addr,size)
! 194: #endif
! 195:
! 196: #if defined(DIRECT_THREADED)
! 197: #define CACHE_FLUSH(addr,size) FLUSH_ICACHE(addr,size)
! 198: #else
! 199: #define CACHE_FLUSH(addr,size)
! 200: #endif
! 201:
! 202: #ifdef USE_TOS
! 203: #define IF_TOS(x) x
! 204: #else
! 205: #define IF_TOS(x)
! 206: #define TOS (sp[0])
! 207: #endif
! 208:
! 209: #ifdef USE_FTOS
! 210: #define IF_FTOS(x) x
! 211: #else
! 212: #define IF_FTOS(x)
! 213: #define FTOS (fp[0])
! 214: #endif
! 215:
! 216: Label *engine(Xt *ip, Cell *sp, Cell *rp, Float *fp, Address lp);
! 217: Address my_alloc(Cell size);
! 218:
! 219: /* dblsub routines */
! 220: DCell dnegate(DCell d1);
! 221: UDCell ummul (UCell a, UCell b);
! 222: DCell mmul (Cell a, Cell b);
! 223: UDCell umdiv (UDCell u, UCell v);
! 224: DCell smdiv (DCell num, Cell denom);
! 225: DCell fmdiv (DCell num, Cell denom);
! 226:
! 227: int memcasecmp(const char *s1, const char *s2, long n);
! 228:
! 229: extern int offset_image;
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