File:  [gforth] / gforth / wordinfo.fs
Revision 1.26: download - view: text, annotated - select for diffs
Sun Mar 9 15:16:57 2003 UTC (16 years, 9 months ago) by anton
Branches: MAIN
CVS tags: v0-6-2, v0-6-1, v0-6-0, HEAD
updated copyright years

    1: \ WORDINFO.FS  V1.0                                    17may93jaw
    2: 
    3: \ Copyright (C) 1995,1996,1998,2000,2003 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., 59 Temple Place, Suite 330, Boston, MA 02111, 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: require 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: \ the old alias? did not work and it is not used, so I changed
   32: \ it in many respects - anton
   33: : alias? ( nfa1 -- nfa2|0 )
   34:     \ if nfa1 is an alias, nfa2 is the name of the original word.
   35:     \ if the original word has no name, return 0.
   36:     dup cell+ @ alias-mask and 0=
   37:     IF ( nfa1 )
   38: 	((name>)) @ >name
   39:     ELSE
   40: 	drop 0
   41:     THEN ;
   42: 
   43: : var?  ( nfa -- flag )
   44:     ((name>)) >code-address dovar: = ;
   45: 
   46: : con?  ( nfa -- flag )
   47:     ((name>)) >code-address docon: = ;
   48: 
   49: : user?  ( nfa -- flag )
   50:     ((name>)) >code-address douser: = ;
   51: 
   52: : does? ( nfa -- flag )
   53:     ((name>))
   54:     >does-code 0<> ;
   55: 
   56: : defered? ( nfa -- flag )
   57:     ((name>)) >code-address dodefer: = ;
   58: 
   59: : colon? ( nfa -- flag )
   60:     ((name>)) >code-address docol: = ;
   61: 
   62: \ the above words could be factored with create-does>, but this would
   63: \ probably make this file incompatible with cross.
   64: 
   65: [IFDEF] forthstart
   66: : xtprim? ( xt -- flag )
   67:     in-dictionary? 0= ; \ !! does not work for CODE words
   68: [ELSE]
   69: : xtprim? ( xt -- flag )
   70:     dup >body swap >code-address = ; \ !! works only for indirect threaded code
   71: 				     \ !! does not work for primitives
   72: [THEN]
   73: : prim? ( nfa -- flag )
   74:         name>int xtprim? ;
   75: 
   76: \ None nestable IDs:
   77: 
   78: 1 CONSTANT Pri#         \ Primitives
   79: 2 CONSTANT Con#         \ Constants
   80: 3 CONSTANT Var#         \ Variables
   81: 4 CONSTANT Val#         \ Values
   82: 
   83: \ Nestabe IDs:
   84: 
   85: 5 CONSTANT Doe#         \ Does part
   86: 6 CONSTANT Def#         \ Defer
   87: 7 CONSTANT Col#         \ Colon def
   88: 8 CONSTANT Use#         \ User variable
   89: 
   90: \ Nobody knows:
   91: 
   92: 9 CONSTANT Ali#         \ Alias
   93: 
   94: 10 CONSTANT Str#         \ Structure words
   95: 
   96: 11 CONSTANT Com#        \ Compiler directives : ; POSTPONE
   97: 
   98: CREATE InfoTable
   99:         ' Prim?    A, Pri# ,
  100:         ' Alias?   A, Ali# ,
  101:         ' Con?     A, Con# ,
  102:         ' Var?     A, Var# ,
  103: \        ' Value?  A, Val# ,
  104:         ' Defered? A, Def# ,
  105:         ' Does?    A, Doe# ,
  106:         ' Colon?   A, Col# ,
  107: 	' User?    A, Use# ,
  108:         0 ,
  109: 
  110: : WordInfo ( nfa --- code )
  111:         InfoTable
  112:         BEGIN  dup @ dup
  113:         WHILE  swap 2 cells + swap
  114:                2 pick swap execute
  115:         UNTIL
  116:         1 cells - @ nip
  117:         ELSE
  118:         2drop drop 0
  119:         THEN ;
  120: 

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