%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(fun_SUITE).
-export([all/0, suite/0,
bad_apply/1,bad_fun_call/1,badarity/1,ext_badarity/1,
bad_arglist/1,
equality/1,ordering/1,
fun_to_port/1,t_phash/1,t_phash2/1,md5/1,
refc/1,refc_ets/1,refc_dist/1,
const_propagation/1,t_arity/1,t_is_function2/1,
t_fun_info/1,t_fun_info_mfa/1]).
-export([nothing/0]).
-include_lib("common_test/include/ct.hrl").
suite() ->
[{ct_hooks,[ts_install_cth]},
{timetrap, {minutes, 1}}].
all() ->
[bad_apply, bad_fun_call, badarity, ext_badarity,
bad_arglist,
equality, ordering, fun_to_port, t_phash,
t_phash2, md5, refc, refc_ets, refc_dist,
const_propagation, t_arity, t_is_function2, t_fun_info,
t_fun_info_mfa].
%% Test that the correct EXIT code is returned for all types of bad funs.
bad_apply(Config) when is_list(Config) ->
bad_apply_fc(42, [0]),
bad_apply_fc(xx, [1]),
bad_apply_fc({}, [2]),
bad_apply_fc({1}, [3]),
bad_apply_fc({1,2,3}, [4]),
bad_apply_fc({1,2,3}, [5]),
bad_apply_fc({1,2,3,4}, [6]),
bad_apply_fc({1,2,3,4,5,6}, [7]),
bad_apply_fc({1,2,3,4,5}, [8]),
bad_apply_badarg({1,2}, [9]),
ok.
bad_apply_fc(Fun, Args) ->
Res = (catch apply(Fun, Args)),
erlang:garbage_collect(),
erlang:yield(),
case Res of
{'EXIT',{{badfun,Fun},_Where}} ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res]);
Other ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res]),
ct:fail({bad_result,Other})
end.
bad_apply_badarg(Fun, Args) ->
Res = (catch apply(Fun, Args)),
erlang:garbage_collect(),
erlang:yield(),
case Res of
{'EXIT',{{badfun,Fun},_Where}} ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res]);
Other ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res]),
ct:fail({bad_result, Other})
end.
%% Try directly calling bad funs.
bad_fun_call(Config) when is_list(Config) ->
bad_call_fc(42),
bad_call_fc(xx),
bad_call_fc({}),
bad_call_fc({1}),
bad_call_fc({1,2,3}),
bad_call_fc({1,2,3}),
bad_call_fc({1,2,3,4}),
bad_call_fc({1,2,3,4,5,6}),
bad_call_fc({1,2,3,4,5}),
bad_call_fc({1,2}),
ok.
bad_call_fc(Fun) ->
Args = [some,stupid,args],
Res = (catch Fun(Fun(Args))),
case Res of
{'EXIT',{{badfun,Fun},_Where}} ->
ok = io:format("~p(~p) -> ~p\n", [Fun,Args,Res]);
Other ->
ok = io:format("~p(~p) -> ~p\n", [Fun,Args,Res]),
ct:fail({bad_result,Other})
end.
% Test erlang:apply with non-proper arg-list
bad_arglist(Config) when is_list(Config) ->
Fun = fun(A,B) -> A+B end,
{'EXIT', {badarg,_}} = (catch apply(Fun, 17)),
{'EXIT', {badarg,_}} = (catch apply(Fun, [17|18])),
{'EXIT', {badarg,_}} = (catch apply(Fun, [17,18|19])),
{'EXIT', {badarg,_}} = (catch apply(lists,seq, 17)),
{'EXIT', {badarg,_}} = (catch apply(lists,seq, [17|18])),
{'EXIT', {badarg,_}} = (catch apply(lists,seq, [17,18|19])),
ok.
%% Call and apply valid funs with wrong number of arguments.
badarity(Config) when is_list(Config) ->
Fun = fun() -> ok end,
Stupid = {stupid,arguments},
Args = [some,{stupid,arguments},here],
%% Simple call.
Res = (catch Fun(some, Stupid, here)),
erlang:garbage_collect(),
erlang:yield(),
case Res of
{'EXIT',{{badarity,{Fun,Args}},_}} ->
ok = io:format("~p(~p) -> ~p\n", [Fun,Args,Res]);
_ ->
ok = io:format("~p(~p) -> ~p\n", [Fun,Args,Res]),
ct:fail({bad_result,Res})
end,
%% Apply.
Res2 = (catch apply(Fun, Args)),
erlang:garbage_collect(),
erlang:yield(),
case Res2 of
{'EXIT',{{badarity,{Fun,Args}},_}} ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res2]);
_ ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res2]),
ct:fail({bad_result,Res2})
end,
ok.
%% Call and apply valid external funs with wrong number of arguments.
ext_badarity(Config) when is_list(Config) ->
Fun = fun ?MODULE:nothing/0,
Stupid = {stupid,arguments},
Args = [some,{stupid,arguments},here],
%% Simple call.
Res = (catch Fun(some, Stupid, here)),
erlang:garbage_collect(),
erlang:yield(),
case Res of
{'EXIT',{{badarity,{Fun,Args}},_}} ->
ok = io:format("~p(~p) -> ~p\n", [Fun,Args,Res]);
_ ->
ok = io:format("~p(~p) -> ~p\n", [Fun,Args,Res]),
ct:fail({bad_result,Res})
end,
%% Apply.
Res2 = (catch apply(Fun, Args)),
erlang:garbage_collect(),
erlang:yield(),
case Res2 of
{'EXIT',{{badarity,{Fun,Args}},_}} ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res2]);
_ ->
ok = io:format("apply(~p, ~p) -> ~p\n", [Fun,Args,Res2]),
ct:fail({bad_result,Res2})
end,
ok.
nothing() ->
ok.
%% Test equality of funs.
equality(Config) when is_list(Config) ->
F0 = fun() -> 1 end,
F0_copy = copy_term(F0),
true = eq(F0, F0),
true = eq(F0, F0_copy),
%% Compare different arities.
F1 = fun(X) -> X + 1 end,
true = eq(F1, F1),
false = eq(F0, F1),
false = eq(F0_copy, F1),
%% Compare different environments.
G1 = make_fun(1),
G2 = make_fun(2),
true = eq(G1, G1),
true = eq(G2, G2),
false = eq(G1, G2),
false = eq(G2, G1),
G1_copy = copy_term(G1),
true = eq(G1, G1_copy),
%% Compare fun with binaries.
B = list_to_binary([7,8,9]),
false = eq(B, G1),
false = eq(G1, B),
%% Compare external funs.
FF0 = fun aa:blurf/0,
FF0_copy = copy_term(FF0),
FF1 = fun erlang:abs/0,
FF2 = fun erlang:exit/1,
FF3 = fun erlang:exit/2,
FF4 = fun z:ff/0,
true = eq(FF0, FF0),
true = eq(FF0, FF0_copy),
true = eq(FF1, FF1),
true = eq(FF2, FF2),
true = eq(FF3, FF3),
true = eq(FF4, FF4),
false = eq(FF0, FF1),
false = eq(FF0, FF2),
false = eq(FF0, FF3),
false = eq(FF0, FF4),
false = eq(FF1, FF0),
false = eq(FF1, FF2),
false = eq(FF1, FF3),
false = eq(FF1, FF4),
false = eq(FF2, FF3),
false = eq(FF2, FF4),
false = eq(FF3, FF4),
%% EEP37
H1 = fun Fact(N) when N > 0 -> N * Fact(N - 1); Fact(0) -> 1 end,
H2 = fun Pow(N, M) when M > 0 -> N * Pow(N, M - 1); Pow(_, 0) -> 1 end,
H1_copy = copy_term(H1),
true = eq(H1, H1),
true = eq(H1, H1_copy),
true = eq(H2, H2),
false = eq(H1, H2),
ok.
eq(X, X) -> true;
eq(_, _) -> false.
copy_term(Term) ->
binary_to_term(term_to_binary(Term)).
make_fun(X) ->
fun() -> X end.
%% Tests ordering of funs.
ordering(Config) when is_list(Config) ->
F1 = make_fun(1, 2),
F1_copy = copy_term(F1),
F2 = make_fun(1, 3),
F3 = make_fun(3, 4),
FF0 = fun aa:blurf/0,
FF1 = fun erlang:abs/0,
FF2 = fun erlang:exit/1,
FF3 = fun erlang:exit/2,
FF4 = fun z:ff/0,
true = FF0 < FF1,
true = FF1 < FF2,
true = FF2 < FF3,
true = FF3 < FF4,
true = FF0 > F1,
true = FF0 > F2,
true = FF0 > F3,
true = FF4 > F1,
true = FF4 > F2,
true = FF4 > F3,
true = F1 == F1,
true = F1 == F1_copy,
true = F1 /= F2,
true = F1 < F2,
true = F2 > F1,
true = F2 < F3,
true = F3 > F2,
false = F1 > F2,
false = F2 > F3,
%% Compare with binaries.
B = list_to_binary([7,8,9,10]),
false = B == F1,
false = F1 == B,
true = F1 < B,
true = B > F2,
false = F1 > B,
false = B < F2,
false = F1 >= B,
false = B =< F2,
%% Compare module funs with binaries.
false = B == FF1,
false = FF1 == B,
true = FF1 < B,
true = B > FF2,
false = FF1 > B,
false = B < FF2,
false = FF1 >= B,
false = B =< FF2,
%% Create a port and ref.
Path = proplists:get_value(priv_dir, Config),
AFile = filename:join(Path, "vanilla_file"),
P = open_port(AFile, [out]),
R = make_ref(),
%% Compare funs with ports and refs.
true = R < F3,
true = F3 > R,
true = F3 < P,
true = P > F3,
true = R =< F3,
true = F3 >= R,
true = F3 =< P,
true = P >= F3,
false = R > F3,
false = F3 < R,
false = F3 > P,
false = P < F3,
%% Compare funs with conses and nils.
true = F1 < [a],
true = F1 < [],
true = [a,b] > F1,
true = [] > F1,
false = [1] < F1,
false = [] < F1,
false = F1 > [2],
false = F1 > [],
false = [1] =< F1,
false = [] =< F1,
false = F1 >= [2],
false = F1 >= [],
%% Compare module funs with conses and nils.
true = FF1 < [a],
true = FF1 < [],
true = [a,b] > FF1,
true = [] > FF1,
false = [1] < FF1,
false = [] < FF1,
false = FF1 > [2],
false = FF1 > [],
false = [1] =< FF1,
false = [] =< FF1,
false = FF1 >= [2],
false = FF1 >= [],
ok.
make_fun(X, Y) ->
fun(A) -> A*X+Y end.
%% Try sending funs to ports (should fail).
fun_to_port(Config) when is_list(Config) ->
fun_to_port(Config, xxx),
fun_to_port(Config, fun() -> 42 end),
fun_to_port(Config, [fun() -> 43 end]),
fun_to_port(Config, [1,fun() -> 44 end]),
fun_to_port(Config, [0,1|fun() -> 45 end]),
B64K = build_io_list(65536),
fun_to_port(Config, [B64K,fun() -> 45 end]),
fun_to_port(Config, [B64K|fun() -> 45 end]),
ok.
fun_to_port(Config, IoList) ->
Path = proplists:get_value(priv_dir, Config),
AFile = filename:join(Path, "vanilla_file"),
Port = open_port(AFile, [out]),
case catch port_command(Port, IoList) of
{'EXIT',{badarg,_}} -> ok;
Other -> ct:fail({unexpected_retval,Other})
end.
build_io_list(0) -> [];
build_io_list(1) -> [7];
build_io_list(N) ->
L = build_io_list(N div 2),
case N rem 2 of
0 -> [L|L];
1 -> [7,L|L]
end.
%% Test the phash/2 BIF on funs.
t_phash(Config) when is_list(Config) ->
F1 = fun(_X) -> 1 end,
F2 = fun(_X) -> 2 end,
true = phash(F1) /= phash(F2),
G1 = make_fun(1, 2, 3),
G2 = make_fun(1, 2, 3),
G3 = make_fun(1, 2, 4),
true = phash(G1) == phash(G2),
true = phash(G2) /= phash(G3),
FF0 = fun erlang:abs/1,
FF1 = fun erlang:exit/1,
FF2 = fun erlang:exit/2,
FF3 = fun blurf:exit/2,
true = phash(FF0) =/= phash(FF1),
true = phash(FF0) =/= phash(FF2),
true = phash(FF0) =/= phash(FF3),
true = phash(FF1) =/= phash(FF2),
true = phash(FF1) =/= phash(FF3),
true = phash(FF2) =/= phash(FF3),
ok.
phash(Term) ->
erlang:phash(Term, 16#7ffffff).
%% Test the phash2/2 BIF on funs.
t_phash2(Config) when is_list(Config) ->
F1 = fun(_X) -> 1 end,
F2 = fun(_X) -> 2 end,
true = phash2(F1) /= phash2(F2),
G1 = make_fun(1, 2, 3),
G2 = make_fun(1, 2, 3),
G3 = make_fun(1, 2, 4),
true = phash2(G1) == phash2(G2),
true = phash2(G2) /= phash2(G3),
FF0 = fun erlang:abs/1,
FF1 = fun erlang:exit/1,
FF2 = fun erlang:exit/2,
FF3 = fun blurf:exit/2,
true = phash2(FF0) =/= phash2(FF1),
true = phash2(FF0) =/= phash2(FF2),
true = phash2(FF0) =/= phash2(FF3),
true = phash2(FF1) =/= phash2(FF2),
true = phash2(FF1) =/= phash2(FF3),
true = phash2(FF2) =/= phash2(FF3),
ok.
phash2(Term) ->
erlang:phash2(Term, 16#7ffffff).
make_fun(X, Y, Z) ->
fun() -> {X,Y,Z} end.
%% Test that MD5 bifs reject funs properly.
md5(Config) when is_list(Config) ->
_ = size(erlang:md5_init()),
%% Try funs in the i/o list.
bad_md5(fun(_X) -> 42 end),
bad_md5([fun(_X) -> 43 end]),
bad_md5([1,fun(_X) -> 44 end]),
bad_md5([1|fun(_X) -> 45 end]),
B64K = build_io_list(65536),
bad_md5([B64K,fun(_X) -> 46 end]),
bad_md5([B64K|fun(_X) -> 46 end]),
ok.
bad_md5(Bad) ->
{'EXIT',{badarg,_}} = (catch erlang:md5(Bad)).
refc(Config) when is_list(Config) ->
F1 = fun_factory(2),
{refc,2} = erlang:fun_info(F1, refc),
F2 = fun_factory(42),
{refc,3} = erlang:fun_info(F1, refc),
process_flag(trap_exit, true),
Pid = spawn_link(fun() -> {refc,4} = erlang:fun_info(F1, refc) end),
receive
{'EXIT',Pid,normal} -> ok;
Other -> ct:fail({unexpected,Other})
end,
process_flag(trap_exit, false),
{refc,3} = erlang:fun_info(F1, refc),
%% Garbage collect. Only the F2 fun will be left.
7 = F1(5),
true = erlang:garbage_collect(),
40 = F2(-2),
{refc,2} = erlang:fun_info(F2, refc),
ok.
fun_factory(Const) ->
fun(X) -> X + Const end.
refc_ets(Config) when is_list(Config) ->
F = fun(X) -> X + 33 end,
{refc,2} = erlang:fun_info(F, refc),
refc_ets_set(F, [set]),
refc_ets_set(F, [ordered_set]),
refc_ets_bag(F, [bag]),
refc_ets_bag(F, [duplicate_bag]),
ok.
refc_ets_set(F1, Options) ->
io:format("~p", [Options]),
Tab = ets:new(kalle, Options),
true = ets:insert(Tab, {a_key,F1}),
3 = fun_refc(F1),
[{a_key,F3}] = ets:lookup(Tab, a_key),
4 = fun_refc(F1),
true = ets:insert(Tab, {a_key,not_a_fun}),
3 = fun_refc(F1),
true = ets:insert(Tab, {another_key,F1}),
4 = fun_refc(F1),
true = ets:delete(Tab),
3 = fun_refc(F1),
10 = F3(-23),
true = erlang:garbage_collect(),
2 = fun_refc(F1),
ok.
refc_ets_bag(F1, Options) ->
io:format("~p", [Options]),
Tab = ets:new(kalle, Options),
true = ets:insert(Tab, {a_key,F1}),
3 = fun_refc(F1),
[{a_key,F3}] = ets:lookup(Tab, a_key),
4 = fun_refc(F1),
true = ets:insert(Tab, {a_key,not_a_fun}),
4 = fun_refc(F1),
true = ets:insert(Tab, {another_key,F1}),
5 = fun_refc(F1),
true = ets:delete(Tab),
3 = fun_refc(F1),
10 = F3(-23),
true = erlang:garbage_collect(),
2 = fun_refc(F1),
ok.
refc_dist(Config) when is_list(Config) ->
{ok,Node} = start_node(fun_SUITE_refc_dist),
process_flag(trap_exit, true),
Pid = spawn_link(Node, fun() -> receive
Fun when is_function(Fun) ->
2 = fun_refc(Fun),
exit({normal,Fun}) end
end),
F = fun() -> 42 end,
2 = fun_refc(F),
Pid ! F,
F2 = receive
{'EXIT',Pid,{normal,Fun}} -> Fun;
Other -> ct:fail({unexpected,Other})
end,
%% dist.c:net_mess2 have a reference to Fun for a while since
%% Fun is passed in an exit signal. Wait until it is gone.
wait_until(fun () -> 4 =/= fun_refc(F2) end),
3 = fun_refc(F2),
true = erlang:garbage_collect(),
2 = fun_refc(F),
refc_dist_send(Node, F).
refc_dist_send(Node, F) ->
Pid = spawn_link(Node, fun() -> receive
{To,Fun} when is_function(Fun) ->
wait_until(fun () ->
2 =:= fun_refc(Fun)
end),
To ! Fun
end
end),
2 = fun_refc(F),
Pid ! {self(),F},
F2 = receive
Fun when is_function(Fun) -> Fun;
Other -> ct:fail({unexpected,Other})
end,
receive {'EXIT',Pid,normal} -> ok end,
%% No reference from dist.c:net_mess2 since Fun is passed
%% in an ordinary message.
3 = fun_refc(F),
3 = fun_refc(F2),
refc_dist_reg_send(Node, F).
refc_dist_reg_send(Node, F) ->
true = erlang:garbage_collect(),
2 = fun_refc(F),
Ref = make_ref(),
Me = self(),
Pid = spawn_link(Node, fun() ->
true = register(my_fun_tester, self()),
Me ! Ref,
receive
{Me,Fun} when is_function(Fun) ->
2 = fun_refc(Fun),
Me ! Fun
end
end),
erlang:yield(),
2 = fun_refc(F),
receive Ref -> ok end,
{my_fun_tester,Node} ! {self(),F},
F2 = receive
Fun when is_function(Fun) -> Fun;
Other -> ct:fail({unexpected,Other})
end,
receive {'EXIT',Pid,normal} -> ok end,
3 = fun_refc(F),
3 = fun_refc(F2),
ok.
fun_refc(F) ->
{refc,Count} = erlang:fun_info(F, refc),
Count.
const_propagation(Config) when is_list(Config) ->
Fun1 = fun start_node/1,
2 = fun_refc(Fun1),
Fun2 = Fun1,
my_cmp({Fun1,Fun2}),
Fun3 = fun() -> ok end,
2 = fun_refc(Fun3),
Fun4 = Fun3,
my_cmp({Fun3,Fun4}),
ok.
my_cmp({Fun,Fun}) -> ok;
my_cmp({Fun1,Fun2}) ->
io:format("Fun1: ~p", [erlang:fun_info(Fun1)]),
io:format("Fun2: ~p", [erlang:fun_info(Fun2)]),
ct:fail(no_match).
t_arity(Config) when is_list(Config) ->
0 = fun_arity(fun() -> ok end),
0 = fun_arity(fun() -> Config end),
1 = fun_arity(fun(X) -> X+1 end),
1 = fun_arity(fun(X) -> Config =:= X end),
A = id(42),
%% Test that the arity is transferred properly.
process_flag(trap_exit, true),
{ok,Node} = start_node(fun_test_arity),
hello_world = spawn_call(Node, fun() -> hello_world end),
0 = spawn_call(Node, fun(X) -> X end),
42 = spawn_call(Node, fun(_X) -> A end),
43 = spawn_call(Node, fun(X, Y) -> A+X+Y end),
1 = spawn_call(Node, fun(X, Y) -> X+Y end),
45 = spawn_call(Node, fun(X, Y, Z) -> A+X+Y+Z end),
ok.
t_is_function2(Config) when is_list(Config) ->
false = is_function(id({a,b}), 0),
false = is_function(id({a,b}), 234343434333433433),
true = is_function(fun() -> ok end, 0),
true = is_function(fun(_) -> ok end, 1),
false = is_function(fun(_) -> ok end, 0),
true = is_function(fun erlang:abs/1, 1),
true = is_function(fun erlang:abs/99, 99),
false = is_function(fun erlang:abs/1, 0),
false = is_function(fun erlang:abs/99, 0),
false = is_function(id(self()), 0),
false = is_function(id({a,b,c}), 0),
false = is_function(id({a}), 0),
false = is_function(id([a,b,c]), 0),
%% Bad arity argument.
bad_arity(a),
bad_arity(-1),
bad_arity(-9738974938734938793873498378),
bad_arity([]),
bad_arity(fun() -> ok end),
bad_arity({}),
bad_arity({a,b}),
bad_arity(self()),
ok.
bad_arity(A) ->
{'EXIT',_} = (catch is_function(fun() -> ok end, A)),
{'EXIT',_} = (catch is_function(no_fun, A)),
ok.
t_fun_info(Config) when is_list(Config) ->
F = fun t_fun_info/1,
try F(blurf) of
FAny ->
ct:fail("should fail; returned ~p\n", [FAny])
catch
error:function_clause -> ok
end,
{module,?MODULE} = erlang:fun_info(F, module),
case erlang:fun_info(F, name) of
undefined ->
ct:fail(no_fun_info);
_ -> ok
end,
{arity,1} = erlang:fun_info(F, arity),
{env,[]} = erlang:fun_info(F, env),
verify_not_undef(F, index),
verify_not_undef(F, uniq),
verify_not_undef(F, new_index),
verify_not_undef(F, new_uniq),
verify_not_undef(F, refc),
{'EXIT',_} = (catch erlang:fun_info(F, blurf)),
%% Module fun.
FF = fun ?MODULE:t_fun_info/1,
try FF(blurf) of
FFAny ->
ct:fail("should fail; returned ~p\n", [FFAny])
catch
error:function_clause -> ok
end,
{module,?MODULE} = erlang:fun_info(FF, module),
{name,t_fun_info} = erlang:fun_info(FF, name),
{arity,1} = erlang:fun_info(FF, arity),
{env,[]} = erlang:fun_info(FF, env),
verify_undef(FF, index),
verify_undef(FF, uniq),
verify_undef(FF, new_index),
verify_undef(FF, new_uniq),
verify_undef(FF, refc),
{'EXIT',_} = (catch erlang:fun_info(FF, blurf)),
%% Not fun.
bad_info(abc),
bad_info(42),
bad_info({fun erlang:list_to_integer/1}),
bad_info([42]),
bad_info([]),
bad_info(self()),
bad_info(<<>>),
bad_info(<<1,2>>),
ok.
t_fun_info_mfa(Config) when is_list(Config) ->
Fun1 = fun spawn_call/2,
{module,M1} = erlang:fun_info(Fun1, module),
{name,F1} = erlang:fun_info(Fun1, name),
{arity,A1} = erlang:fun_info(Fun1, arity),
{M1,F1,A1=2} = erlang:fun_info_mfa(Fun1),
%% Module fun.
Fun2 = fun ?MODULE:t_fun_info/1,
{module,M2} = erlang:fun_info(Fun2, module),
{name,F2} = erlang:fun_info(Fun2, name),
{arity,A2} = erlang:fun_info(Fun2, arity),
{M2,F2,A2=1} = erlang:fun_info_mfa(Fun2),
%% Not fun.
{'EXIT',_} = (catch erlang:fun_info_mfa(id(d))),
ok.
bad_info(Term) ->
try erlang:fun_info(Term, module) of
Any ->
ict:fail("should fail; returned ~p\n", [Any])
catch
error:badarg -> ok
end.
verify_undef(Fun, Tag) ->
{Tag,undefined} = erlang:fun_info(Fun, Tag).
verify_not_undef(Fun, Tag) ->
case erlang:fun_info(Fun, Tag) of
{Tag,undefined} ->
ct:fail("tag ~w not defined in fun_info", [Tag]);
{Tag,_} -> ok
end.
id(X) ->
X.
spawn_call(Node, AFun) ->
Pid = spawn_link(Node,
fun() ->
receive
{Fun,Fun,Fun} when is_function(Fun) ->
Arity = fun_arity(Fun),
Args = case Arity of
0 -> [];
_ -> lists:seq(0, Arity-1)
end,
Res = apply(Fun, Args),
{pid,Creator} = erlang:fun_info(Fun, pid),
Creator ! {result,Res}
end
end),
Pid ! {AFun,AFun,AFun},
Res = receive
{result,R} -> R;
Other -> ct:fail({bad_message,Other})
after 10000 ->
ct:fail(timeout_waiting_for_result)
end,
receive
{'EXIT',Pid,normal} -> ok;
Other2 -> ct:fail({bad_message_waiting_for_exit,Other2})
after 10000 ->
ct:fail(timeout_waiting_for_exit)
end,
Res.
fun_arity(F) ->
{arity,Arity} = erlang:fun_info(F, arity),
Arity.
start_node(Name) ->
Pa = filename:dirname(code:which(?MODULE)),
Cookie = atom_to_list(erlang:get_cookie()),
test_server:start_node(Name, slave,
[{args, "-setcookie " ++ Cookie ++" -pa " ++ Pa}]).
wait_until(Fun) ->
case catch Fun() of
true -> ok;
_ -> receive after 100 -> wait_until(Fun) end
end.
