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authorErlang/OTP <[email protected]>2010-06-08 13:40:20 +0000
committerErlang/OTP <[email protected]>2010-06-08 13:40:20 +0000
commitaf15e8bd5bdf976b232e6515cf3cca4200b6120b (patch)
treed3db0e27ddcd2f1e5fd4bdf0c2d5413c819fe5ad /lib/hipe
parent59b1c9eac599c563610cfe6e7bf8517ed58d54d3 (diff)
parent3e56a0158b5a4e8b66deab9886fd67131744c701 (diff)
downloadotp-af15e8bd5bdf976b232e6515cf3cca4200b6120b.tar.gz
otp-af15e8bd5bdf976b232e6515cf3cca4200b6120b.tar.bz2
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Merge branch 'bg/bif-types' into dev
* bg/bif-types: Add type information for erlang:garbage_collect_message_area/0 Add type information for erts_debug:* BIFs Add type information for erlang:port_call/2 Add type information for erlang:display* BIFs Add type information for the BIFs in the binary module Introduce and use the t_endian() helper Add type information for erlang:binary_part/2,3 Add type info for erlang:append/2 and erlang:subtract/2 Add type information for the erlang:adler32* BIFs Add ppc64 return for erlang:system_info(hipe_architecture) Test that all BIFs have known types erl_types: Export is_erl_type/1
Diffstat (limited to 'lib/hipe')
-rw-r--r--lib/hipe/cerl/erl_bif_types.erl212
-rw-r--r--lib/hipe/cerl/erl_types.erl5
2 files changed, 202 insertions, 15 deletions
diff --git a/lib/hipe/cerl/erl_bif_types.erl b/lib/hipe/cerl/erl_bif_types.erl
index 523c00b2be..838f9429f0 100644
--- a/lib/hipe/cerl/erl_bif_types.erl
+++ b/lib/hipe/cerl/erl_bif_types.erl
@@ -143,6 +143,51 @@ type(M, F, A) ->
-spec type(atom(), atom(), arity(), [erl_types:erl_type()]) -> erl_types:erl_type().
+%%-- binary -------------------------------------------------------------------
+type(binary, at, 2, Xs) ->
+ strict(arg_types(binary, at, 2), Xs, fun(_) -> t_integer() end);
+type(binary, bin_to_list, Arity, Xs) when 1 =< Arity, Arity =< 3 ->
+ strict(arg_types(binary, bin_to_list, Arity), Xs,
+ fun(_) -> t_list(t_integer()) end);
+type(binary, compile_pattern, 1, Xs) ->
+ strict(arg_types(binary, compile_pattern, 1), Xs,
+ fun(_) -> t_tuple([t_atom(bm),t_binary()]) end);
+type(binary, copy, Arity, Xs) when Arity =:= 1; Arity =:= 2 ->
+ strict(arg_types(binary, copy, Arity), Xs,
+ fun(_) -> t_binary() end);
+type(binary, decode_unsigned, Arity, Xs) when Arity =:= 1; Arity =:= 2 ->
+ strict(arg_types(binary, decode_unsigned, Arity), Xs,
+ fun(_) -> t_non_neg_integer() end);
+type(binary, encode_unsigned, Arity, Xs) when Arity =:= 1; Arity =:= 2 ->
+ strict(arg_types(binary, encode_unsigned, Arity), Xs,
+ fun(_) -> t_binary() end);
+type(binary, first, 1, Xs) ->
+ strict(arg_types(binary, first, 1), Xs, fun(_) -> t_non_neg_integer() end);
+type(binary, last, 1, Xs) ->
+ strict(arg_types(binary, last, 1), Xs, fun(_) -> t_non_neg_integer() end);
+type(binary, list_to_bin, 1, Xs) ->
+ type(erlang, list_to_binary, 1, Xs);
+type(binary, longest_common_prefix, 1, Xs) ->
+ strict(arg_types(binary, longest_common_prefix, 1), Xs,
+ fun(_) -> t_integer() end);
+type(binary, longest_common_suffix, 1, Xs) ->
+ strict(arg_types(binary, longest_common_suffix, 1), Xs,
+ fun(_) -> t_integer() end);
+type(binary, match, Arity, Xs) when Arity =:= 2; Arity =:= 3 ->
+ strict(arg_types(binary, match, Arity), Xs,
+ fun(_) ->
+ t_sup(t_atom('nomatch'), t_binary_canonical_part())
+ end);
+type(binary, matches, Arity, Xs) when Arity =:= 2; Arity =:= 3 ->
+ strict(arg_types(binary, matches, Arity), Xs,
+ fun(_) -> t_list(t_binary_canonical_part()) end);
+type(binary, part, 2, Xs) ->
+ type(erlang, binary_part, 2, Xs);
+type(binary, part, 3, Xs) ->
+ type(erlang, binary_part, 3, Xs);
+type(binary, referenced_byte_size, 1, Xs) ->
+ strict(arg_types(binary, referenced_byte_size, 1), Xs,
+ fun(_) -> t_non_neg_integer() end);
%%-- code ---------------------------------------------------------------------
type(code, add_path, 1, Xs) ->
strict(arg_types(code, add_path, 1), Xs,
@@ -665,6 +710,14 @@ type(erlang, 'bnot', 1, Xs) ->
%% strict(arg_types(erlang, 'bnot', 1), Xs, fun (_) -> t_integer() end);
type(erlang, abs, 1, Xs) ->
strict(arg_types(erlang, abs, 1), Xs, fun ([X]) -> X end);
+type(erlang, adler32, 1, Xs) ->
+ strict(arg_types(erlang, adler32, 1), Xs, fun (_) -> t_adler32() end);
+type(erlang, adler32, 2, Xs) ->
+ strict(arg_types(erlang, adler32, 2), Xs, fun (_) -> t_adler32() end);
+type(erlang, adler32_combine, 3, Xs) ->
+ strict(arg_types(erlang, adler32_combine, 3), Xs,
+ fun (_) -> t_adler32() end);
+type(erlang, append, 2, Xs) -> type(erlang, '++', 2, Xs); % alias
type(erlang, append_element, 2, Xs) ->
strict(arg_types(erlang, append_element, 2), Xs, fun (_) -> t_tuple() end);
type(erlang, apply, 2, Xs) ->
@@ -683,6 +736,10 @@ type(erlang, atom_to_binary, 2, Xs) ->
strict(arg_types(erlang, atom_to_binary, 2), Xs, fun (_) -> t_binary() end);
type(erlang, atom_to_list, 1, Xs) ->
strict(arg_types(erlang, atom_to_list, 1), Xs, fun (_) -> t_string() end);
+type(erlang, binary_part, 2, Xs) ->
+ strict(arg_types(erlang, binary_part, 2), Xs, fun (_) -> t_binary() end);
+type(erlang, binary_part, 3, Xs) ->
+ strict(arg_types(erlang, binary_part, 3), Xs, fun (_) -> t_binary() end);
type(erlang, binary_to_atom, 2, Xs) ->
strict(arg_types(erlang, binary_to_atom, 2), Xs, fun (_) -> t_atom() end);
type(erlang, binary_to_existing_atom, 2, Xs) ->
@@ -726,11 +783,11 @@ type(erlang, check_process_code, 2, Xs) ->
type(erlang, concat_binary, 1, Xs) ->
strict(arg_types(erlang, concat_binary, 1), Xs, fun (_) -> t_binary() end);
type(erlang, crc32, 1, Xs) ->
- strict(arg_types(erlang, crc32, 1), Xs, fun (_) -> t_integer() end);
+ strict(arg_types(erlang, crc32, 1), Xs, fun (_) -> t_crc32() end);
type(erlang, crc32, 2, Xs) ->
- strict(arg_types(erlang, crc32, 2), Xs, fun (_) -> t_integer() end);
+ strict(arg_types(erlang, crc32, 2), Xs, fun (_) -> t_crc32() end);
type(erlang, crc32_combine, 3, Xs) ->
- strict(arg_types(erlang, crc32_combine, 3), Xs, fun (_) -> t_integer() end);
+ strict(arg_types(erlang, crc32_combine, 3), Xs, fun (_) -> t_crc32() end);
type(erlang, date, 0, _) ->
t_date();
type(erlang, decode_packet, 3, Xs) ->
@@ -752,6 +809,10 @@ type(erlang, demonitor, 2, Xs) ->
type(erlang, disconnect_node, 1, Xs) ->
strict(arg_types(erlang, disconnect_node, 1), Xs, fun (_) -> t_boolean() end);
type(erlang, display, 1, _) -> t_atom('true');
+type(erlang, display_string, 1, Xs) ->
+ strict(arg_types(erlang, display_string, 1), Xs, fun(_) -> t_atom('true') end);
+type(erlang, display_nl, 0, _) ->
+ t_atom('true');
type(erlang, dist_exit, 3, Xs) ->
strict(arg_types(erlang, dist_exit, 3), Xs, fun (_) -> t_atom('true') end);
type(erlang, element, 2, Xs) ->
@@ -802,6 +863,8 @@ type(erlang, fun_to_list, 1, Xs) ->
type(erlang, garbage_collect, 0, _) -> t_atom('true');
type(erlang, garbage_collect, 1, Xs) ->
strict(arg_types(erlang, garbage_collect, 1), Xs, fun (_) -> t_boolean() end);
+type(erlang, garbage_collect_message_area, 0, _) ->
+ t_boolean();
type(erlang, get, 0, _) -> t_list(t_tuple(2));
type(erlang, get, 1, _) -> t_any(); % | t_atom('undefined')
type(erlang, get_cookie, 0, _) -> t_atom(); % | t_atom('nocookie')
@@ -1177,8 +1240,8 @@ type(erlang, phash2, 2, Xs) ->
strict(arg_types(erlang, phash2, 2), Xs, fun (_) -> t_non_neg_integer() end);
type(erlang, pid_to_list, 1, Xs) ->
strict(arg_types(erlang, pid_to_list, 1), Xs, fun (_) -> t_string() end);
-type(erlang, port_call, 3, Xs) ->
- strict(arg_types(erlang, port_call, 3), Xs, fun (_) -> t_any() end);
+type(erlang, port_call, Arity, Xs) when Arity =:= 2; Arity =:= 3 ->
+ strict(arg_types(erlang, port_call, Arity), Xs, fun (_) -> t_any() end);
type(erlang, port_close, 1, Xs) ->
strict(arg_types(erlang, port_close, 1), Xs,
fun (_) -> t_atom('true') end);
@@ -1507,6 +1570,7 @@ type(erlang, statistics, 1, Xs) ->
T_statistics_1
end
end);
+type(erlang, subtract, 2, Xs) -> type(erlang, '--', 2, Xs); % alias
type(erlang, suspend_process, 1, Xs) ->
strict(arg_types(erlang, suspend_process, 1), Xs,
fun (_) -> t_atom('true') end);
@@ -1599,7 +1663,7 @@ type(erlang, system_info, 1, Xs) ->
t_sup([t_atom('false'),
t_list(t_tuple([t_atom(), t_any()]))]);
['endian'] ->
- t_sup([t_atom('big'), t_atom('little')]);
+ t_endian();
['fullsweep_after'] ->
t_tuple([t_atom('fullsweep_after'), t_non_neg_integer()]);
['garbage_collection'] ->
@@ -1611,9 +1675,8 @@ type(erlang, system_info, 1, Xs) ->
['heap_type'] ->
t_sup([t_atom('private'), t_atom('hybrid')]);
['hipe_architecture'] ->
- t_sup([t_atom('amd64'), t_atom('arm'),
- t_atom('powerpc'), t_atom('undefined'),
- t_atom('ultrasparc'), t_atom('x86')]);
+ t_atoms(['amd64', 'arm', 'powerpc', 'ppc64',
+ 'undefined', 'ultrasparc', 'x86']);
['info'] ->
t_binary();
['internal_cpu_topology'] -> %% Undocumented internal feature
@@ -1789,11 +1852,21 @@ type(erts_debug, disassemble, 1, Xs) ->
fun (_) -> t_sup([t_atom('false'),
t_atom('undef'),
t_tuple([t_integer(), t_binary(), t_mfa()])]) end);
+type(erts_debug, display, 1, _) ->
+ t_string();
type(erts_debug, dist_ext_to_term, 2, Xs) ->
strict(arg_types(erts_debug, dist_ext_to_term, 2), Xs,
fun (_) -> t_any() end);
+type(erts_debug, dump_monitors, 1, Xs) ->
+ strict(arg_types(erts_debug, dump_monitors, 1), Xs,
+ fun(_) -> t_atom('true') end);
+type(erts_debug, dump_links, 1, Xs) ->
+ strict(arg_types(erts_debug, dump_links, 1), Xs,
+ fun(_) -> t_atom('true') end);
type(erts_debug, flat_size, 1, Xs) ->
strict(arg_types(erts_debug, flat_size, 1), Xs, fun (_) -> t_integer() end);
+type(erts_debug, get_internal_state, 1, _) ->
+ t_any();
type(erts_debug, lock_counters, 1, Xs) ->
strict(arg_types(erts_debug, lock_counters, 1), Xs,
fun ([Arg]) ->
@@ -1814,6 +1887,8 @@ type(erts_debug, lock_counters, 1, Xs) ->
end);
type(erts_debug, same, 2, Xs) ->
strict(arg_types(erts_debug, same, 2), Xs, fun (_) -> t_boolean() end);
+type(erts_debug, set_internal_state, 2, _) ->
+ t_any();
%%-- ets ----------------------------------------------------------------------
type(ets, all, 0, _) ->
t_list(t_tab());
@@ -2103,7 +2178,7 @@ type(hipe_bifs, set_native_address, 3, Xs) ->
strict(arg_types(hipe_bifs, set_native_address, 3), Xs,
fun (_) -> t_nil() end);
type(hipe_bifs, system_crc, 1, Xs) ->
- strict(arg_types(hipe_bifs, system_crc, 1), Xs, fun (_) -> t_integer() end);
+ strict(arg_types(hipe_bifs, system_crc, 1), Xs, fun (_) -> t_crc32() end);
type(hipe_bifs, term_to_word, 1, Xs) ->
strict(arg_types(hipe_bifs, term_to_word, 1), Xs,
fun (_) -> t_integer() end);
@@ -3198,6 +3273,53 @@ arith(Op, X1, X2) ->
-spec arg_types(atom(), atom(), arity()) -> [erl_types:erl_type()] | 'unknown'.
+%%------- binary --------------------------------------------------------------
+arg_types(binary, at, 2) ->
+ [t_binary(), t_non_neg_integer()];
+arg_types(binary, bin_to_list, 1) ->
+ [t_binary()];
+arg_types(binary, bin_to_list, 2) ->
+ [t_binary(), t_binary_part()];
+arg_types(binary, bin_to_list, 3) ->
+ [t_binary(), t_integer(), t_non_neg_integer()];
+arg_types(binary, compile_pattern, 1) ->
+ [t_sup(t_binary(), t_list(t_binary()))];
+arg_types(binary, copy, 1) ->
+ [t_binary()];
+arg_types(binary, copy, 2) ->
+ [t_binary(), t_non_neg_integer()];
+arg_types(binary, decode_unsigned, 1) ->
+ [t_binary()];
+arg_types(binary, decode_unsigned, 2) ->
+ [t_binary(), t_endian()];
+arg_types(binary, encode_unsigned, 1) ->
+ [t_non_neg_integer()];
+arg_types(binary, encode_unsigned, 2) ->
+ [t_non_neg_integer(), t_endian()];
+arg_types(binary, first, 1) ->
+ [t_binary()];
+arg_types(binary, last, 1) ->
+ [t_binary()];
+arg_types(binary, list_to_bin, 1) ->
+ arg_types(erlang, list_to_binary, 1);
+arg_types(binary, longest_common_prefix, 1) ->
+ [t_list(t_binary())];
+arg_types(binary, longest_common_suffix, 1) ->
+ [t_list(t_binary())];
+arg_types(binary, match, 2) ->
+ [t_binary(), t_binary_pattern()];
+arg_types(binary, match, 3) ->
+ [t_binary(), t_binary_pattern(), t_binary_options()];
+arg_types(binary, matches, 2) ->
+ [t_binary(), t_binary_pattern()];
+arg_types(binary, matches, 3) ->
+ [t_binary(), t_binary_pattern(), t_binary_options()];
+arg_types(binary, part, 2) ->
+ arg_types(erlang, binary_part, 2);
+arg_types(binary, part, 3) ->
+ arg_types(erlang, binary_part, 3);
+arg_types(binary, referenced_byte_size, 1) ->
+ [t_binary()];
%%------- code ----------------------------------------------------------------
arg_types(code, add_path, 1) ->
[t_string()];
@@ -3379,6 +3501,14 @@ arg_types(erlang, 'bnot', 1) ->
[t_integer()];
arg_types(erlang, abs, 1) ->
[t_number()];
+arg_types(erlang, adler32, 1) ->
+ [t_iodata()];
+arg_types(erlang, adler32, 2) ->
+ [t_adler32(), t_iodata()];
+arg_types(erlang, adler32_combine, 3) ->
+ [t_adler32(), t_adler32(), t_non_neg_integer()];
+arg_types(erlang, append, 2) ->
+ arg_types(erlang, '++', 2);
arg_types(erlang, append_element, 2) ->
[t_tuple(), t_any()];
arg_types(erlang, apply, 2) ->
@@ -3392,6 +3522,10 @@ arg_types(erlang, atom_to_binary, 2) ->
[t_atom(), t_encoding_a2b()];
arg_types(erlang, atom_to_list, 1) ->
[t_atom()];
+arg_types(erlang, binary_part, 2) ->
+ [t_binary(), t_tuple([t_integer(),t_integer()])];
+arg_types(erlang, binary_part, 3) ->
+ [t_binary(), t_integer(), t_integer()];
arg_types(erlang, binary_to_atom, 2) ->
[t_binary(), t_encoding_a2b()];
arg_types(erlang, binary_to_existing_atom, 2) ->
@@ -3427,9 +3561,9 @@ arg_types(erlang, concat_binary, 1) ->
arg_types(erlang, crc32, 1) ->
[t_iodata()];
arg_types(erlang, crc32, 2) ->
- [t_integer(), t_iodata()];
+ [t_crc32(), t_iodata()];
arg_types(erlang, crc32_combine, 3) ->
- [t_integer(), t_integer(), t_integer()];
+ [t_crc32(), t_crc32(), t_non_neg_integer()];
arg_types(erlang, date, 0) ->
[];
arg_types(erlang, decode_packet, 3) ->
@@ -3444,6 +3578,10 @@ arg_types(erlang, disconnect_node, 1) ->
[t_node()];
arg_types(erlang, display, 1) ->
[t_any()];
+arg_types(erlang, display_nl, 0) ->
+ [];
+arg_types(erlang, display_string, 1) ->
+ [t_string()];
arg_types(erlang, dist_exit, 3) ->
[t_pid(), t_dist_exit(), t_sup(t_pid(), t_port())];
arg_types(erlang, element, 2) ->
@@ -3480,6 +3618,8 @@ arg_types(erlang, garbage_collect, 0) ->
[];
arg_types(erlang, garbage_collect, 1) ->
[t_pid()];
+arg_types(erlang, garbage_collect_message_area, 0) ->
+ [];
arg_types(erlang, get, 0) ->
[];
arg_types(erlang, get, 1) ->
@@ -3676,6 +3816,8 @@ arg_types(erlang, phash2, 2) ->
[t_any(), t_pos_integer()];
arg_types(erlang, pid_to_list, 1) ->
[t_pid()];
+arg_types(erlang, port_call, 2) ->
+ [t_sup(t_port(), t_atom()), t_any()];
arg_types(erlang, port_call, 3) ->
[t_sup(t_port(), t_atom()), t_integer(), t_any()];
arg_types(erlang, port_close, 1) ->
@@ -3803,6 +3945,8 @@ arg_types(erlang, statistics, 1) ->
t_atom('run_queue'),
t_atom('runtime'),
t_atom('wall_clock')])];
+arg_types(erlang, subtract, 2) ->
+ arg_types(erlang, '--', 2);
arg_types(erlang, suspend_process, 1) ->
[t_pid()];
arg_types(erlang, suspend_process, 2) ->
@@ -3925,10 +4069,18 @@ arg_types(erts_debug, breakpoint, 2) ->
[t_tuple([t_atom(), t_atom(), t_sup(t_integer(), t_atom('_'))]), t_boolean()];
arg_types(erts_debug, disassemble, 1) ->
[t_sup(t_mfa(), t_integer())];
+arg_types(erts_debug, display, 1) ->
+ [t_any()];
arg_types(erts_debug, dist_ext_to_term, 2) ->
[t_tuple(), t_binary()];
+arg_types(erts_debug, dump_monitors, 1) ->
+ [t_sup([t_pid(),t_atom()])];
+arg_types(erts_debug, dump_links, 1) ->
+ [t_sup([t_pid(),t_atom(),t_port()])];
arg_types(erts_debug, flat_size, 1) ->
[t_any()];
+arg_types(erts_debug, get_internal_state, 1) ->
+ [t_any()];
arg_types(erts_debug, lock_counters, 1) ->
[t_sup([t_atom(enabled),
t_atom(info),
@@ -3937,6 +4089,8 @@ arg_types(erts_debug, lock_counters, 1) ->
t_tuple([t_atom(process_locks), t_boolean()])])];
arg_types(erts_debug, same, 2) ->
[t_any(), t_any()];
+arg_types(erts_debug, set_internal_state, 2) ->
+ [t_any(), t_any()];
%%------- ets -----------------------------------------------------------------
arg_types(ets, all, 0) ->
[];
@@ -4117,7 +4271,7 @@ arg_types(hipe_bifs, call_count_off, 1) ->
arg_types(hipe_bifs, call_count_on, 1) ->
[t_mfa()];
arg_types(hipe_bifs, check_crc, 1) ->
- [t_integer()];
+ [t_crc32()];
arg_types(hipe_bifs, enter_code, 2) ->
[t_binary(), t_sup(t_nil(), t_tuple())];
arg_types(hipe_bifs, enter_sdesc, 1) ->
@@ -4161,7 +4315,7 @@ arg_types(hipe_bifs, set_funinfo_native_address, 3) ->
arg_types(hipe_bifs, set_native_address, 3) ->
[t_mfa(), t_integer(), t_boolean()];
arg_types(hipe_bifs, system_crc, 1) ->
- [t_integer()];
+ [t_crc32()];
arg_types(hipe_bifs, term_to_word, 1) ->
[t_any()];
arg_types(hipe_bifs, update_code_size, 3) ->
@@ -4475,6 +4629,30 @@ t_httppacket() ->
t_sup([t_HttpRequest(), t_HttpResponse(),
t_HttpHeader(), t_atom('http_eoh'), t_HttpError()]).
+t_endian() ->
+ t_sup([t_atom('big'), t_atom('little')]).
+
+%% =====================================================================
+%% Types for the binary module
+%% =====================================================================
+
+t_binary_part() ->
+ t_tuple([t_non_neg_integer(),t_integer()]).
+
+t_binary_canonical_part() ->
+ t_tuple([t_non_neg_integer(),t_non_neg_integer()]).
+
+t_binary_pattern() ->
+ t_sup([t_binary(),
+ t_list(t_binary()),
+ t_binary_compiled_pattern()]).
+
+t_binary_compiled_pattern() ->
+ t_tuple([t_atom('cp'),t_binary()]).
+
+t_binary_options() ->
+ t_list(t_tuple([t_atom('scope'),t_binary_part()])).
+
%% =====================================================================
%% HTTP types documented in R12B-4
%% =====================================================================
@@ -4557,6 +4735,12 @@ t_code_loaded_fname_or_status() ->
%% These are used for the built-in functions of 'erlang'
%% =====================================================================
+t_adler32() ->
+ t_non_neg_integer().
+
+t_crc32() ->
+ t_non_neg_integer().
+
t_decode_packet_option() ->
t_sup([t_tuple([t_atom('packet_size'), t_non_neg_integer()]),
t_tuple([t_atom('line_length'), t_non_neg_integer()])]).
diff --git a/lib/hipe/cerl/erl_types.erl b/lib/hipe/cerl/erl_types.erl
index 758914ff9e..c1d80740a1 100644
--- a/lib/hipe/cerl/erl_types.erl
+++ b/lib/hipe/cerl/erl_types.erl
@@ -206,7 +206,8 @@
%% t_assign_variables_to_subtype/2,
type_is_defined/3,
subst_all_vars_to_any/1,
- lift_list_to_pos_empty/1
+ lift_list_to_pos_empty/1,
+ is_erl_type/1
]).
%%-define(DO_ERL_TYPES_TEST, true).
@@ -3776,6 +3777,8 @@ any_none_or_unit([?unit|_]) -> true;
any_none_or_unit([_|Left]) -> any_none_or_unit(Left);
any_none_or_unit([]) -> false.
+-spec is_erl_type(any()) -> boolean().
+
is_erl_type(?any) -> true;
is_erl_type(?none) -> true;
is_erl_type(?unit) -> true;