File:  [gforth] / gforth / wordinfo.fs
Revision 1.8: download - view: text, annotated - select for diffs
Tue Nov 7 18:07:05 1995 UTC (24 years, 4 months ago) by anton
Branches: MAIN
CVS tags: gforth-0_1beta, HEAD
added copyright headers
changes to loadfilename & co. to make savesystem transparent to
 assertions and ~~

    1: \ WORDINFO.FS  V1.0                                    17may93jaw
    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: \ 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"
   34: \       cell+
   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 )
   41:     cell+ (name>) >code-address dovar: = ;
   42: 
   43: : con?  ( nfa -- flag )
   44:     cell+ (name>) >code-address docon: = ;
   45: 
   46: : user?  ( nfa -- flag )
   47:     cell+ (name>) >code-address douser: = ;
   48: 
   49: : does? ( nfa -- flag )
   50:     \ !! does not work on all installations
   51:     cell+ (name>)
   52:     >code-address ['] bits >code-address = ;
   53: 
   54: : defered? ( nfa -- flag )
   55:     cell+ (name>) >code-address dodefer: = ;
   56: 
   57: : colon? ( nfa -- flag )
   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.
   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
   87: 8 CONSTANT Use#         \ User variable
   88: 
   89: \ Nobody knows:
   90: 
   91: 9 CONSTANT Ali#         \ Alias
   92: 
   93: 10 CONSTANT Str#         \ Structure words
   94: 
   95: 11 CONSTANT Com#        \ Compiler directives : ; POSTPONE
   96: 
   97: CREATE InfoTable
   98:         ' Prim?    A, Pri# ,
   99:         ' Alias?   A, Ali# ,
  100:         ' Con?     A, Con# ,
  101:         ' Var?     A, Var# ,
  102: \        ' Value?  A, Val# ,
  103:         ' Defered? A, Def# ,
  104:         ' Does?    A, Doe# ,
  105:         ' Colon?   A, Col# ,
  106: 	' User?    A, Use# ,
  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: 

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