File:  [gforth] / gforth / environ.fs
Revision 1.31: download - view: text, annotated - select for diffs
Sun Mar 9 15:16:47 2003 UTC (16 years, 5 months ago) by anton
Branches: MAIN
CVS tags: v0-6-2, v0-6-1, v0-6-0, HEAD
updated copyright years

    1: \ environmental queries
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998,2000,2003 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: \ wordlist constant environment-wordlist
   22: 
   23: vocabulary environment ( -- ) \ gforth
   24: \ for win32forth compatibility
   25: 
   26: ' environment >body constant environment-wordlist ( -- wid ) \ gforth
   27:   \G @i{wid} identifies the word list that is searched by environmental
   28:   \G queries.
   29: 
   30: 
   31: : environment? ( c-addr u -- false / ... true ) \ core environment-query
   32:     \G @i{c-addr, u} specify a counted string. If the string is not
   33:     \G recognised, return a @code{false} flag. Otherwise return a
   34:     \G @code{true} flag and some (string-specific) information about
   35:     \G the queried string.
   36:     environment-wordlist search-wordlist if
   37: 	execute true
   38:     else
   39: 	false
   40:     endif ;
   41: 
   42: : e? name environment? 0= ABORT" environmental dependency not existing" ;
   43: 
   44: : $has? environment? 0= IF false THEN ;
   45: 
   46: : has? name $has? ;
   47: 
   48: environment-wordlist set-current
   49: get-order environment-wordlist swap 1+ set-order
   50: 
   51: \ assumes that chars, cells and doubles use an integral number of aus
   52: 
   53: \ this should be computed in C as CHAR_BITS/sizeof(char),
   54: \ but I don't know any machine with gcc where an au does not have 8 bits.
   55: 8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
   56: \G Size of one address unit, in bits.
   57: 
   58: 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment
   59: \G Maximum value of any character in the character set
   60: 
   61: MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment
   62: \G Maximum size of a counted string, in characters.
   63: 
   64: ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment
   65: \G Size of the pictured numeric string output buffer, in characters.
   66: 
   67: &84 constant /PAD ( -- n ) \ environment
   68: \G Size of the scratch area pointed to by @code{PAD}, in characters.
   69: 
   70: true constant CORE ( -- f ) \ environment
   71: \G True if the complete core word set is present. Always true for Gforth.
   72: 
   73: true constant CORE-EXT ( -- f ) \ environment
   74: \G True if the complete core extension word set is present. Always true for Gforth.
   75: 
   76: 1 -3 mod 0< constant FLOORED ( -- f ) \ environment
   77: \G True if @code{/} etc. perform floored division
   78: 
   79: 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment
   80: \G Largest usable signed integer.
   81: 
   82: -1 constant MAX-U ( -- u ) \ environment
   83: \G Largest usable unsigned integer.
   84: 
   85: -1 MAX-N 2constant MAX-D ( -- d ) \ environment
   86: \G Largest usable signed double.
   87: 
   88: -1. 2constant MAX-UD ( -- ud ) \ environment
   89: \G Largest usable unsigned double.
   90: 
   91: version-string 2constant gforth ( -- c-addr u ) \ gforth-environment
   92: \G Counted string representing a version string for this version of
   93: \G Gforth (for versions>0.3.0).  The version strings of the various
   94: \G versions are guaranteed to be ordered lexicographically.
   95: 
   96: : return-stack-cells ( -- n ) \ environment
   97:     \G Maximum size of the return stack, in cells.
   98:     [ forthstart 6 cells + ] literal @ cell / ;
   99: 
  100: : stack-cells ( -- n ) \ environment
  101:     \G Maximum size of the data stack, in cells.
  102:     [ forthstart 4 cells + ] literal @ cell / ;
  103: 
  104: : floating-stack ( -- n ) \ environment
  105:     \G @var{n} is non-zero, showing that Gforth maintains a separate
  106:     \G floating-point stack of depth @var{n}.
  107:     [ forthstart 5 cells + ] literal @
  108:     [IFDEF] float  float  [ELSE]  [ 1 floats ] Literal [THEN] / ;
  109: 
  110: 15 constant #locals \ 1000 64 /
  111:     \ One local can take up to 64 bytes, the size of locals-buffer is 1000
  112: maxvp constant wordlists
  113: 
  114: forth definitions
  115: previous
  116: 

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