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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012-2013. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(asn1ct_func).
-export([start_link/0,need/1,call/3,generate/1]).
-export([init/1,handle_call/3,handle_cast/2,terminate/2]).
start_link() ->
{ok,Pid} = gen_server:start_link(?MODULE, [], []),
put(?MODULE, Pid),
ok.
call(M, F, Args) ->
MFA = {M,F,length(Args)},
need(MFA),
asn1ct_gen:emit([F,"(",call_args(Args, ""),")"]).
need(MFA) ->
asn1ct_rtt:assert_defined(MFA),
cast({need,MFA}).
generate(Fd) ->
Used0 = req(get_used),
erase(?MODULE),
Used = sofs:set(Used0, [mfa]),
Code = sofs:relation(asn1ct_rtt:code(), [{mfa,code}]),
Funcs0 = sofs:image(Code, Used),
Funcs = sofs:to_external(Funcs0),
ok = file:write(Fd, Funcs).
req(Req) ->
gen_server:call(get(?MODULE), Req, infinity).
cast(Req) ->
gen_server:cast(get(?MODULE), Req).
%%% Internal functions.
-record(st, {used}).
init([]) ->
St = #st{used=gb_sets:empty()},
{ok,St}.
handle_cast({need,MFA}, #st{used=Used0}=St) ->
case gb_sets:is_member(MFA, Used0) of
false ->
Used = pull_in_deps(gb_sets:singleton(MFA), Used0),
{noreply,St#st{used=Used}};
true ->
{noreply,St}
end.
handle_call(get_used, _From, #st{used=Used}=St) ->
{stop,normal,gb_sets:to_list(Used),St}.
terminate(_, _) ->
ok.
call_args([A|As], Sep) ->
[Sep,A|call_args(As, ", ")];
call_args([], _) -> [].
pull_in_deps(Ws0, Used0) ->
case gb_sets:is_empty(Ws0) of
true ->
Used0;
false ->
{MFA,Ws1} = gb_sets:take_smallest(Ws0),
Used = gb_sets:add(MFA, Used0),
Needs = asn1ct_rtt:dependencies(MFA),
Ws = update_worklist(Needs, Used, Ws1),
pull_in_deps(Ws, Used)
end.
update_worklist([H|T], Used, Ws) ->
case gb_sets:is_member(H, Used) of
false ->
update_worklist(T, Used, gb_sets:add(H, Ws));
true ->
update_worklist(T, Used, Ws)
end;
update_worklist([], _, Ws) -> Ws.
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