Annotation of gforth/wordinfo.fs, revision 1.23

1.1       anton       1: \ WORDINFO.FS  V1.0                                    17may93jaw
                      2: 
1.21      anton       3: \ Copyright (C) 1995,1996,1998,2000 Free Software Foundation, Inc.
1.8       anton       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
1.22      anton      19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.8       anton      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: 
1.19      anton      25: require look.fs
1.1       anton      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: 
1.9       anton      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 )
1.20      anton      34:     \ if nfa1 is an alias, nfa2 is the name of the original word.
                     35:     \ if the original word has no name, return 0.
1.23    ! anton      36:     dup cell+ @ alias-mask and 0=
1.12      anton      37:     IF ( nfa1 )
1.20      anton      38:        ((name>)) @ >name
1.9       anton      39:     ELSE
                     40:        drop 0
                     41:     THEN ;
1.1       anton      42: 
                     43: : var?  ( nfa -- flag )
1.12      anton      44:     ((name>)) >code-address dovar: = ;
1.1       anton      45: 
                     46: : con?  ( nfa -- flag )
1.12      anton      47:     ((name>)) >code-address docon: = ;
1.1       anton      48: 
1.5       pazsan     49: : user?  ( nfa -- flag )
1.12      anton      50:     ((name>)) >code-address douser: = ;
1.5       pazsan     51: 
1.1       anton      52: : does? ( nfa -- flag )
1.12      anton      53:     ((name>))
1.13      anton      54:     >does-code 0<> ;
1.1       anton      55: 
                     56: : defered? ( nfa -- flag )
1.12      anton      57:     ((name>)) >code-address dodefer: = ;
1.1       anton      58: 
                     59: : colon? ( nfa -- flag )
1.12      anton      60:     ((name>)) >code-address docol: = ;
1.7       anton      61: 
                     62: \ the above words could be factored with create-does>, but this would
                     63: \ probably make this file incompatible with cross.
1.1       anton      64: 
1.14      jwilke     65: [IFDEF] forthstart
                     66: : xtprim? ( xt -- flag )
1.18      anton      67:     in-dictionary? 0= ; \ !! does not work for CODE words
1.14      jwilke     68: [ELSE]
                     69: : xtprim? ( xt -- flag )
1.15      anton      70:     dup >body swap >code-address = ; \ !! works only for indirect threaded code
                     71:                                     \ !! does not work for primitives
1.14      jwilke     72: [THEN]
1.1       anton      73: : prim? ( nfa -- flag )
1.14      jwilke     74:         name>int xtprim? ;
1.1       anton      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
1.5       pazsan     88: 8 CONSTANT Use#         \ User variable
1.1       anton      89: 
                     90: \ Nobody knows:
                     91: 
1.5       pazsan     92: 9 CONSTANT Ali#         \ Alias
1.1       anton      93: 
1.5       pazsan     94: 10 CONSTANT Str#         \ Structure words
1.1       anton      95: 
1.5       pazsan     96: 11 CONSTANT Com#        \ Compiler directives : ; POSTPONE
1.1       anton      97: 
                     98: CREATE InfoTable
1.5       pazsan     99:         ' Prim?    A, Pri# ,
                    100:         ' Alias?   A, Ali# ,
                    101:         ' Con?     A, Con# ,
                    102:         ' Var?     A, Var# ,
                    103: \        ' Value?  A, Val# ,
1.1       anton     104:         ' Defered? A, Def# ,
1.5       pazsan    105:         ' Does?    A, Doe# ,
                    106:         ' Colon?   A, Col# ,
                    107:        ' User?    A, Use# ,
1.1       anton     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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