\ environmental queries
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\ This file is part of Gforth.
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\ wordlist constant environment-wordlist
Create environment-wordlist ( -- wid ) \ gforth
\G @i{wid} identifies the word list that is searched by environmental
\G queries.
wordlist drop
: environment? ( c-addr u -- false / ... true ) \ core environment-query
\G @i{c-addr, u} specify a counted string. If the string is not
\G recognised, return a @code{false} flag. Otherwise return a
\G @code{true} flag and some (string-specific) information about
\G the queried string.
environment-wordlist search-wordlist if
execute true
else
false
endif ;
: e? name environment? 0= ABORT" environmental dependency not existing" ;
: has? name environment? 0= IF false THEN ;
: $has? environment? 0= IF false THEN ;
environment-wordlist set-current
get-order environment-wordlist swap 1+ set-order
\ assumes that chars, cells and doubles use an integral number of aus
\ 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.
8 constant ADDRESS-UNIT-BITS ( -- n ) \ environment
\G Size of one address unit, in bits.
1 ADDRESS-UNIT-BITS chars lshift 1- constant MAX-CHAR ( -- u ) \ environment
\G Maximum value of any character in the character set
MAX-CHAR constant /COUNTED-STRING ( -- n ) \ environment
\G Maximum size of a counted string, in characters.
ADDRESS-UNIT-BITS cells 2* 2 + constant /HOLD ( -- n ) \ environment
\G Size of the pictured numeric string output buffer, in characters.
&84 constant /PAD ( -- n ) \ environment
\G Size of the scratch area pointed to by @code{PAD}, in characters.
true constant CORE ( -- f ) \ environment
\G True if the complete core word set is present. Always true for Gforth.
true constant CORE-EXT ( -- f ) \ environment
\G True if the complete core extension word set is present. Always true for Gforth.
1 -3 mod 0< constant FLOORED ( -- f ) \ environment
\G True if @code{/} etc. perform floored division
1 ADDRESS-UNIT-BITS cells 1- lshift 1- constant MAX-N ( -- n ) \ environment
\G Largest usable signed integer.
-1 constant MAX-U ( -- u ) \ environment
\G Largest usable unsigned integer.
-1 MAX-N 2constant MAX-D ( -- d ) \ environment
\G Largest usable signed double.
-1. 2constant MAX-UD ( -- ud ) \ environment
\G Largest usable unsigned double.
version-string 2constant gforth ( -- c-addr u ) \ gforth-environment
\G Counted string representing a version string for this version of
\G Gforth (for versions>0.3.0). The version strings of the various
\G versions are guaranteed to be ordered lexicographically.
: return-stack-cells ( -- n ) \ environment
\G Maximum size of the return stack, in cells.
[ forthstart 6 cells + ] literal @ cell / ;
: stack-cells ( -- n ) \ environment
\G Maximum size of the data stack, in cells.
[ forthstart 4 cells + ] literal @ cell / ;
: floating-stack ( -- n ) \ environment
\G @var{n} is non-zero, showing that Gforth maintains a separate
\G floating-point stack of depth @var{n}.
[ forthstart 5 cells + ] literal @
[IFDEF] float float [ELSE] [ 1 floats ] Literal [THEN] / ;
\ !! max-float
15 constant #locals \ 1000 64 /
\ One local can take up to 64 bytes, the size of locals-buffer is 1000
maxvp constant wordlists
forth definitions
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