File:  [gforth] / gforth / wordinfo.fs
Revision 1.3: download - view: text, annotated - select for diffs
Fri Jun 17 13:28:33 1994 UTC (25 years, 6 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Moved -DDEFAULT_BIN before version dependent features (TOS, etc.)
Changed sample variable in wordinfo.fs to udp

    1: \ WORDINFO.FS  V1.0                                    17may93jaw
    2: 
    3: \ May be cross-compiled
    4: \ If you want check values then exclude comments,
    5: \ but keep in mind that this can't be cross-compiled
    6: 
    7: INCLUDE look.fs
    8: 
    9: \ Wordinfo is a tool that checks a nfa
   10: \ and finds out what wordtype we have
   11: \ it is used in SEE.FS
   12: 
   13: : alias? ( nfa -- flag )
   14:         dup name> look
   15:         0= ABORT" WINFO: CFA not found"
   16:         cell+
   17:         2dup <>
   18:         IF   nip dup 1 cells - here !
   19:              count $1f and here cell+ place true
   20:         ELSE 2drop false THEN ;
   21: 
   22: : var?  ( nfa -- flag )
   23:         (name>)
   24:         >code-address ['] udp >code-address = ;
   25: 
   26: : con?  ( nfa -- flag )
   27:         (name>)
   28:         >code-address ['] bl >code-address = ;
   29: 
   30: : does? ( nfa -- flag )
   31:         dup (name>)
   32:         >code-address ['] source >code-address =
   33:         dup IF swap (name>) cell+ @ here ! ELSE nip THEN ;
   34: 
   35: : defered? ( nfa -- flag )
   36:         dup does?
   37:         IF here @ ['] source cell+ @ =
   38:            dup IF swap (name>) >body @ here ! ELSE nip THEN
   39:         ELSE drop false THEN ;
   40: 
   41: : colon? ( nfa -- flag )
   42:         (name>)
   43:         >code-address ['] does? >code-address = ;
   44: 
   45: \ VALUE VCheck
   46: 
   47: \ : value? ( nfa -- flag )
   48: \         dup does?
   49: \         IF here @ ['] VCheck cell+ @ =
   50: \            dup IF swap (name>) >body @ here ! ELSE nip THEN
   51: \         ELSE drop false THEN ;
   52: 
   53: : prim? ( nfa -- flag )
   54:         name>
   55:         forthstart u< ;
   56: 
   57: \ None nestable IDs:
   58: 
   59: 1 CONSTANT Pri#         \ Primitives
   60: 2 CONSTANT Con#         \ Constants
   61: 3 CONSTANT Var#         \ Variables
   62: 4 CONSTANT Val#         \ Values
   63: 
   64: \ Nestabe IDs:
   65: 
   66: 5 CONSTANT Doe#         \ Does part
   67: 6 CONSTANT Def#         \ Defer
   68: 7 CONSTANT Col#         \ Colon def
   69: 
   70: \ Nobody knows:
   71: 
   72: 8 CONSTANT Ali#         \ Alias
   73: 
   74: 9 CONSTANT Str#         \ Structure words
   75: 
   76: 10 CONSTANT Com#        \ Compiler directives : ; POSTPONE
   77: 
   78: CREATE InfoTable
   79:         ' Alias? A, Ali# ,
   80:         ' Con?   A, Con# ,
   81:         ' Var?   A, Var# ,
   82: \        ' Value? A, Val# ,
   83:         ' Defered? A, Def# ,
   84:         ' Does? A, Doe# ,
   85:         ' Colon? A, Col# ,
   86:         ' Prim? A, Pri# ,
   87:         0 ,
   88: 
   89: : WordInfo ( nfa --- code )
   90:         InfoTable
   91:         BEGIN  dup @ dup
   92:         WHILE  swap 2 cells + swap
   93:                2 pick swap execute
   94:         UNTIL
   95:         1 cells - @ nip
   96:         ELSE
   97:         2drop drop 0
   98:         THEN ;
   99: 

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