| \ environmental queries |
\ environmental queries |
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| \ wordlist constant environment-wordlist |
\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
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| Create environment-wordlist wordlist drop |
\ Gforth is free software; you can redistribute it and/or |
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\ modify it under the terms of the GNU General Public License |
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\ as published by the Free Software Foundation; either version 2 |
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\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
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\ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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\ GNU General Public License for more details. |
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|
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\ You should have received a copy of the GNU General Public License |
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\ along with this program; if not, write to the Free Software |
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\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| : environment? ( c-addr u -- false / ... true ) |
\ wordlist constant environment-wordlist |
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Create environment-wordlist ( -- wid ) \ gforth |
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\G @i{wid} identifies the word list that is searched by environmental |
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\G queries. |
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wordlist drop |
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: environment? ( c-addr u -- false / ... true ) \ core environment-query |
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\G @i{c-addr, u} specify a counted string. If the string is not |
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\G recognised, return a @code{false} flag. Otherwise return a |
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\G @code{true} flag and some (string-specific) information about |
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\G the queried string. |
| environment-wordlist search-wordlist if |
environment-wordlist search-wordlist if |
| execute true |
execute true |
| else |
else |
| false |
false |
| endif ; |
endif ; |
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: e? name environment? 0= ABORT" environmental dependency not existing" ; |
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: has? name environment? 0= IF false THEN ; |
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: $has? environment? 0= IF false THEN ; |
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| environment-wordlist set-current |
environment-wordlist set-current |
| get-order environment-wordlist swap 1+ set-order |
get-order environment-wordlist swap 1+ set-order |
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| \ this should be computed in C as CHAR_BITS/sizeof(char), |
\ this should be computed in C as CHAR_BITS/sizeof(char), |
| \ but I don't know any machine with gcc where an au does not have 8 bits. |
\ but I don't know any machine with gcc where an au does not have 8 bits. |
| 8 constant ADDRESS-UNIT-BITS |
8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment |
| 1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR |
\G Size of one address unit, in bits. |
| MAX-CHAR constant /COUNTED-STRING |
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| ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD |
1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment |
| &84 constant /PAD |
\G Maximum value of any character in the character set |
| true constant CORE |
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| \ CORE-EXT? |
MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment |
| 1 -3 mod 0< constant FLOORED |
\G Maximum size of a counted string, in characters. |
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| 1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N |
ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment |
| -1 constant MAX-U |
\G Size of the pictured numeric string output buffer, in characters. |
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&84 constant /PAD ( -- n ) \ environment |
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\G Size of the scratch area pointed to by @code{PAD}, in characters. |
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true constant CORE ( -- f ) \ environment |
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\G True if the complete core word set is present. Always true for Gforth. |
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true constant CORE-EXT ( -- f ) \ environment |
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\G True if the complete core extension word set is present. Always true for Gforth. |
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1 -3 mod 0< constant FLOORED ( -- f ) \ environment |
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\G True if @code{/} etc. perform floored division |
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1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment |
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\G Largest usable signed integer. |
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-1 constant MAX-U ( -- u ) \ environment |
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\G Largest usable unsigned integer. |
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-1 MAX-N 2constant MAX-D ( -- d ) \ environment |
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\G Largest usable signed double. |
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-1. 2constant MAX-UD ( -- ud ) \ environment |
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\G Largest usable unsigned double. |
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version-string 2constant gforth ( -- c-addr u ) \ gforth-environment |
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\G Counted string representing a version string for this version of |
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\G Gforth (for versions>0.3.0). The version strings of the various |
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\G versions are guaranteed to be sorted lexicographically. |
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: return-stack-cells ( -- n ) \ environment |
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\G Maximum size of the return stack, in cells. |
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[ forthstart 6 cells + ] literal @ cell / ; |
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| -1 MAX-N 2constant MAX-D |
: stack-cells ( -- n ) \ environment |
| -1. 2constant MAX-UD |
\G Maximum size of the data stack, in cells. |
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[ forthstart 4 cells + ] literal @ cell / ; |
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| 0 0 2constant gforth \ minor mayor version |
: floating-stack ( -- n ) \ environment |
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\G @var{n} is non-zero, showing that Gforth maintains a separate |
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\G floating-point stack of depth @var{n}. |
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[ forthstart 5 cells + ] literal @ |
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[IFDEF] float float [ELSE] [ 1 floats ] Literal [THEN] / ; |
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| \ !! RETURN-STACK-CELLS |
\ !! max-float |
| \ !! STACK-CELLS |
15 constant #locals \ 1000 64 / |
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\ One local can take up to 64 bytes, the size of locals-buffer is 1000 |
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maxvp constant wordlists |
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| forth definitions |
forth definitions |
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