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\RequirePackage{xkeyval}
\newcount\@lisp@gc@count
\newcount\@lisp@gc@perform@result
\def\@lisp@gc@alloc@count@max{32768} % memory limit
\def\@lisp@gc@alloc@local{} % objects on stack
\def\@lisp@gc@usedenv{} % used local environment
\def\@lisp@gc@alloc@raw{} % used memory on local
\def\@lisp@gc@alloc@pinning{} % pinned objects
\def\@lisp@gc@mark@bitvector{} % mark bitmap
\def\@lisp@gc@mark@bitvector@{} % mark bitmap (default)
% execute GC option
\DeclareOptionX{heapsize}{\def\@lisp@gc@alloc@count@max{#1}}
\ProcessOptionsX
% gc initializer (called by lisp-on-tex.sty)
\def\@lisp@gc@init{%
\@lisp@gc@count=0\relax
\@lisp@gc@perform@result=\@lisp@gc@alloc@count@max\relax
% create mark bits
% clear all mark bits
\@tempcnta0
\@whilenum\@tempcnta<\@lisp@gc@alloc@count@max\do{%
\@lisp@gc@off@markbit{\the\@tempcnta}%
\advance\@tempcnta1}%
% set default value to each memory
\@tempcnta0
\@whilenum\@tempcnta<\@lisp@gc@alloc@count@max\do{%
\expandafter\gdef
\csname @lisp@gc@memory@\the\@tempcnta\endcsname
{\relax\relax}% initialize
\advance\@tempcnta1}}
% allocator
% The allocator define #1 to allocated the control sequence
\def\@lisp@gc@alloc#1{%
% if memory is full, do gc
\ifnum\@lisp@gc@count<\@lisp@gc@alloc@count@max\else
\@lisp@gc@perform
\fi
% allocation
\def#1{}%
\@lisp@gc@alloc@@#1}
\def\@lisp@gc@alloc@@#1{%
\csname if@lisp@gc@memory@\the\@lisp@gc@count\endcsname
\else % unused memory is found
% allocate
\expandafter\def\expandafter#1%
\expandafter{\csname @lisp@gc@memory@\the\@lisp@gc@count\endcsname}%
% clear memory (for marking)
\expandafter\gdef
\csname @lisp@gc@memory@\the\@lisp@gc@count\endcsname{\relax\relax}%
\fi
\global\advance\@lisp@gc@count1
\let\@@next\@gobble
\ifx#1\@empty
\ifnum\@lisp@gc@count<\@lisp@gc@alloc@count@max
\let\@@next\@lisp@gc@alloc@@
\else
\def\@@next{%
\@lisp@gc@perform
\ifnum\@lisp@gc@perform@result=0\relax
\expandafter\@gobble % empty
\else
\expandafter\@lisp@gc@alloc@@
\fi}%
\fi
\fi
\@@next#1}
% GC main routine. The routine is called by the allocator.
% If you want to call GC manually, you can do it.
\def\@lisp@gc@perform{%
\message{LISP on TeX: now GCing...^^J}%
% reset result
\global\@lisp@gc@perform@result\@lisp@gc@alloc@count@max\relax
% clear all mark bits
\@tempcnta0
\@whilenum\@tempcnta<\@lisp@gc@count\do{%
\@lisp@gc@off@markbit{\the\@tempcnta}%
\advance\@tempcnta1}%
% start marking mode
\begingroup
% define all typelabels to mark mode
\@lisp@gc@make@tlabel@mark@mode
% init queue and enque root set
%% raw memory
\expandafter\def\expandafter\@lisp@gc@mark@Q\expandafter{\@lisp@gc@alloc@raw}%
%% local env
\expandafter\@lisp@gc@mark@env\@lisp@gc@usedenv\@lisp@unused\relax
%% global env
\expandafter\@lisp@gc@mark@env\@lisp@globalenv\@lisp@unused\relax
%% pinned objects
\@lisp@gc@alloc@pinning
%% stack
\@lisp@gc@alloc@local
% marking start
\@lisp@gc@foreachQ\@lisp@gc@mark@Q\@lisp@gc@mark
% end marking mode
\endgroup
% reset counter
\global\@lisp@gc@count0
% show GC result
\message{LISP on TeX: GC done (free \the\@lisp@gc@perform@result)^^J}}
\def\@lisp@gc@make@tlabel@mark@mode{%
\@for\@lisp@on@tex@type:=\@defined@lisp@on@tex\do{%
\expandafter\let
\csname @tlabel@\@lisp@on@tex@type\endcsname\@gobble}%
\def\@tlabel@cons##1{\@lisp@gc@mark@cons##1}%
\def\@tlabel@mutable##1{\@lisp@gc@enQ\@lisp@gc@mark@Q{##1}}%
\def\@tlabel@closure##1{\@lisp@gc@mark@closure##1}%
\def\@tlabel@macro##1{\@lisp@gc@mark@closure##1}%
\def\@tlabel@exception##1{\@lisp@gc@mark@exception##1}%
\@for\@lisp@on@tex@type:=\@defined@additional@type\do{%
\expandafter\@lisp@gc@create@markmode@additional
\csname @tlabel@\@lisp@on@tex@type\endcsname
\csname @lisp@gc@trace\@lisp@on@tex@type\endcsname}}
\def\@lisp@unused{\@lisp@unused@}
\def\@lisp@gc@mark@cons#1#2{%
\@lisp@gc@enQ\@lisp@gc@mark@Q{#1}%
\@lisp@gc@enQ\@lisp@gc@mark@Q{#2}}
\def\@lisp@gc@mark@closure#1#2#3#4{%
\@lisp@gc@mark@env#2\@lisp@unused\relax
#3{#4}}
\def\@lisp@gc@mark@exception#1#2{#2}%
\def\@lisp@gc@create@markmode@additional#1{%
\expandafter\@lisp@gc@create@markmode@additional@\expandafter#1}
\def\@lisp@gc@create@markmode@additional@#1#2{\let#1#2}
% mark objects in a environment
\def\@lisp@gc@mark@env#1#2{%
\ifx#1\@lisp@unused
\let\@@next\relax
\else
\def\@@next{#2\@lisp@gc@mark@env}%
\fi
\@@next}
% global let for save and restore memory
\def\@lisp@gc@global@let#1{\expandafter\@lisp@gc@global@let@\expandafter#1}
\def\@lisp@gc@global@let@#1#2{\global\let#1#2}
% queue
\def\@lisp@gc@enQ#1#2{% #1 : queue, #2 value
\expandafter\def\expandafter#1\expandafter{#1#2}}
\def\@lisp@gc@deQ#1#2{% #1 : queue, #2 cs
\ifx#1\@empty
\def#2{}%
\else
\expandafter\@lisp@gc@deQ@\expandafter#1\expandafter#2#1\relax
\fi}
\def\@lisp@gc@deQ@#1#2#3#4\relax{%
\def#1{#4}\def#2{#3}}
\def\@lisp@gc@foreachQ#1#2{% #1 : queue, #2 : token -> 'a
\@lisp@gc@deQ#1\@lisp@gc@temp@local
\ifx\@lisp@gc@temp@local\@empty
\let\@@next\relax
\else
\def\@@next{%
\expandafter#2\expandafter{\@lisp@gc@temp@local}%
\@lisp@gc@foreachQ#1#2}%
\fi\@@next}
% marker
\def\@lisp@gc@mark#1{\expandafter\@lisp@gc@mark@\string#1\relax}
\expandafter\def\expandafter\@lisp@gc@mark@\string\@lisp@gc@memory@#1\relax{%
\csname if@lisp@gc@memory@#1\endcsname\else
% count down remain memory
\global\advance\@lisp@gc@perform@result-1
% turn mark bit on
\@lisp@gc@on@markbit{#1}%
% enqueue if we need
\csname @lisp@gc@memory@#1\endcsname
\fi}
% pin a object on global.
\def\@lisp@gc@pinning#1#2{%
\expandafter\gdef\expandafter\@lisp@gc@alloc@pinning
\expandafter{\@lisp@gc@alloc@pinning#1{#2}}}
% pinning objects on local.
\def\@lisp@gc@save@objects@local#1{%
\expandafter\def\expandafter\@lisp@gc@alloc@local
\expandafter{\@lisp@gc@alloc@local#1}}
% pinning memories on local.
\def\@lisp@gc@save@memory@local#1{%
\expandafter\def\expandafter\@lisp@gc@alloc@raw
\expandafter{\@lisp@gc@alloc@raw#1}}
% pinning environmnt on local.
\def\@lisp@gc@save@env@local#1{%
\expandafter\def\expandafter\@lisp@gc@usedenv
\expandafter{\@lisp@gc@usedenv#1}}
% for mark bits
\def\@lisp@gc@on@markbit#1{\expandafter\global\expandafter\let\csname if@lisp@gc@memory@#1\endcsname\iftrue}
\def\@lisp@gc@off@markbit#1{\expandafter\global\expandafter\let\csname if@lisp@gc@memory@#1\endcsname\iffalse}
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