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Annotation of gforth/wordinfo.fs, revision 1.8

1.1       anton       1: \ WORDINFO.FS  V1.0                                    17may93jaw
                      2: 
1.8     ! anton       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: 
1.1       anton      21: \ May be cross-compiled
                     22: \ If you want check values then exclude comments,
                     23: \ but keep in mind that this can't be cross-compiled
                     24: 
                     25: INCLUDE look.fs
                     26: 
                     27: \ Wordinfo is a tool that checks a nfa
                     28: \ and finds out what wordtype we have
                     29: \ it is used in SEE.FS
                     30: 
                     31: : alias? ( nfa -- flag )
                     32:         dup name> look
                     33:         0= ABORT" WINFO: CFA not found"
1.4       pazsan     34: \       cell+
1.1       anton      35:         2dup <>
                     36:         IF   nip dup 1 cells - here !
                     37:              count $1f and here cell+ place true
                     38:         ELSE 2drop false THEN ;
                     39: 
                     40: : var?  ( nfa -- flag )
1.7       anton      41:     cell+ (name>) >code-address dovar: = ;
1.1       anton      42: 
                     43: : con?  ( nfa -- flag )
1.7       anton      44:     cell+ (name>) >code-address docon: = ;
1.1       anton      45: 
1.5       pazsan     46: : user?  ( nfa -- flag )
1.7       anton      47:     cell+ (name>) >code-address douser: = ;
1.5       pazsan     48: 
1.1       anton      49: : does? ( nfa -- flag )
1.7       anton      50:     \ !! does not work on all installations
                     51:     cell+ (name>)
                     52:     >code-address ['] bits >code-address = ;
1.1       anton      53: 
                     54: : defered? ( nfa -- flag )
1.7       anton      55:     cell+ (name>) >code-address dodefer: = ;
1.1       anton      56: 
                     57: : colon? ( nfa -- flag )
1.7       anton      58:     cell+ (name>) >code-address docol: = ;
                     59: 
                     60: \ the above words could be factored with create-does>, but this would
                     61: \ probably make this file incompatible with cross.
1.1       anton      62: 
                     63: \ VALUE VCheck
                     64: 
                     65: \ : value? ( nfa -- flag )
                     66: \         dup does?
                     67: \         IF here @ ['] VCheck cell+ @ =
                     68: \            dup IF swap (name>) >body @ here ! ELSE nip THEN
                     69: \         ELSE drop false THEN ;
                     70: 
                     71: : prim? ( nfa -- flag )
                     72:         name>
                     73:         forthstart u< ;
                     74: 
                     75: \ None nestable IDs:
                     76: 
                     77: 1 CONSTANT Pri#         \ Primitives
                     78: 2 CONSTANT Con#         \ Constants
                     79: 3 CONSTANT Var#         \ Variables
                     80: 4 CONSTANT Val#         \ Values
                     81: 
                     82: \ Nestabe IDs:
                     83: 
                     84: 5 CONSTANT Doe#         \ Does part
                     85: 6 CONSTANT Def#         \ Defer
                     86: 7 CONSTANT Col#         \ Colon def
1.5       pazsan     87: 8 CONSTANT Use#         \ User variable
1.1       anton      88: 
                     89: \ Nobody knows:
                     90: 
1.5       pazsan     91: 9 CONSTANT Ali#         \ Alias
1.1       anton      92: 
1.5       pazsan     93: 10 CONSTANT Str#         \ Structure words
1.1       anton      94: 
1.5       pazsan     95: 11 CONSTANT Com#        \ Compiler directives : ; POSTPONE
1.1       anton      96: 
                     97: CREATE InfoTable
1.5       pazsan     98:         ' Prim?    A, Pri# ,
                     99:         ' Alias?   A, Ali# ,
                    100:         ' Con?     A, Con# ,
                    101:         ' Var?     A, Var# ,
                    102: \        ' Value?  A, Val# ,
1.1       anton     103:         ' Defered? A, Def# ,
1.5       pazsan    104:         ' Does?    A, Doe# ,
                    105:         ' Colon?   A, Col# ,
                    106:        ' User?    A, Use# ,
1.1       anton     107:         0 ,
                    108: 
                    109: : WordInfo ( nfa --- code )
                    110:         InfoTable
                    111:         BEGIN  dup @ dup
                    112:         WHILE  swap 2 cells + swap
                    113:                2 pick swap execute
                    114:         UNTIL
                    115:         1 cells - @ nip
                    116:         ELSE
                    117:         2drop drop 0
                    118:         THEN ;
                    119: