diff options
Diffstat (limited to 'lib/hipe/test/bs_SUITE_data')
| -rw-r--r-- | lib/hipe/test/bs_SUITE_data/bs_match_compiler.erl | 1235 |
1 files changed, 1235 insertions, 0 deletions
diff --git a/lib/hipe/test/bs_SUITE_data/bs_match_compiler.erl b/lib/hipe/test/bs_SUITE_data/bs_match_compiler.erl new file mode 100644 index 0000000000..4cb48ff57e --- /dev/null +++ b/lib/hipe/test/bs_SUITE_data/bs_match_compiler.erl @@ -0,0 +1,1235 @@ +%%% -*- erlang-indent-level: 2 -*- +%%%------------------------------------------------------------------- +%%% File : bs_match_compiler.erl +%%% +%%%------------------------------------------------------------------- +-module(bs_match_compiler). +-compile(nowarn_shadow_vars). + +-export([test/0]). +-export([exported_id/1, exported_id/2]). %% needed by a test + +test() -> + Funs = [fun fun_shadow/0, fun int_float/0, fun otp_5269/0, fun null_fields/0, + fun wiger/0, fun bin_tail/0, fun save_restore/0, + fun partitioned_bs_match/0, fun function_clause/0, fun unit/0, + fun shared_sub_bins/0, fun bin_and_float/0, fun dec_subidentifiers/0, + fun skip_optional_tag/0, fun wfbm/0, fun degenerated_match/0, + fun bs_sum/0, fun coverage/0, fun multiple_uses/0, fun zero_label/0, + fun followed_by_catch/0, fun matching_meets_construction/0, + fun simon/0, fun matching_and_andalso/0, + fun otp_7188/0, fun otp_7233/0, fun otp_7240/0, fun otp_7498/0, + fun match_string/0, fun zero_width/0, fun bad_size/0, fun haystack/0, + fun cover_beam_bool/0, fun matched_out_size/0, fun follow_fail_br/0, + fun no_partition/0, fun calling_a_binary/0, fun binary_in_map/0, + fun match_string_opt/0, fun map_and_binary/0, + fun unsafe_branch_caching/0], + lists:foreach(fun (F) -> ok = F() end, Funs). + + +%%-------------------------------------------------------------------- +%% OTP-5270 + +fun_shadow() -> + 7 = fun_shadow_1(), + 7 = fun_shadow_2(8), + 7 = fun_shadow_3(), + no = fun_shadow_4(8), + ok. + +fun_shadow_1() -> + L = 8, + F = fun(<<L:L,B:L>>) -> B end, + F(<<16:8, 7:16>>). + +fun_shadow_2(L) -> + F = fun(<<L:L,B:L>>) -> B end, + F(<<16:8, 7:16>>). + +fun_shadow_3() -> + L = 8, + F = fun(<<L:L,B:L,L:L>>) -> B end, + F(<<16:8, 7:16,16:16>>). + +fun_shadow_4(L) -> + F = fun(<<L:L,B:L,L:L>>) -> B; + (_) -> no end, + F(<<16:8, 7:16,15:16>>). + +%%-------------------------------------------------------------------- +%% OTP-5323 + +int_float() -> + <<103133.0:64/float>> = <<103133:64/float>>, + <<103133:64/float>> = <<103133:64/float>>, + ok. + +%%-------------------------------------------------------------------- +%% Stolen from erl_eval_SUITE and modified. +%% OTP-5269. Bugs in the bit syntax. + +otp_5269() -> + check(fun() -> L = 8, F = fun(<<A:L,B:A>>) -> B end, F(<<16:8, 7:16>>) end, 7), + check(fun() -> L = 8, <<A:L,B:A>> = <<16:8, 7:16>>, B end, 7), + check(fun() -> U = 8, (fun(<<U:U>>) -> U end)(<<32:8>>) end, 32), + check(fun() -> U = 8, [U || <<U:U>> <- [<<32:8>>]] end, [32]), + check(fun() -> [X || <<A:8, B:A>> <- [<<16:8,19:16>>], + <<X:8>> <- [<<B:8>>]] end, + [19]), + check(fun() -> A = 4, B = 28, _ = bit_size(<<13:(A+(X=B))>>), X end, 28), + check(fun() -> + <<Size,B:Size/binary,Rest/binary>> = <<2,"AB","CD">>, + {Size,B,Rest} + end, {2,<<"AB">>,<<"CD">>}), + check(fun() -> X = 32, [X || <<X:X>> <- [<<1:32>>,<<2:32>>,<<3:8>>]] end, + %% "binsize variable" ^ + [1,2]), + check(fun() -> + (fun (<<A:1/binary, B:8/integer, _C:B/binary>>) -> + case A of + B -> wrong; + _ -> ok + end + end)(<<1,2,3,4>>) end, + ok), + ok. + +%%-------------------------------------------------------------------- + +null_fields() -> + check(fun() -> + W = id(0), + F = fun(<<_:W>>) -> tail; + (<<>>) -> empty + end, + F(<<>>) + end, tail), + check(fun() -> + F = fun(<<_/binary>>) -> tail; + (<<>>) -> empty + end, + F(<<>>) + end, tail), + ok. + +%%-------------------------------------------------------------------- + +wiger() -> + ok1 = wcheck(<<3>>), + ok2 = wcheck(<<1,2,3>>), + ok3 = wcheck(<<4>>), + {error,<<1,2,3,4>>} = wcheck(<<1,2,3,4>>), + {error,<<>>} = wcheck(<<>>), + ok. + +wcheck(<<A>>) when A==3-> + ok1; +wcheck(<<_,_:2/binary>>) -> + ok2; +wcheck(<<_>>) -> + ok3; +wcheck(Other) -> + {error,Other}. + +%%-------------------------------------------------------------------- + +bin_tail() -> + S = <<"abcde">>, + $a = bin_tail_c(S, 0), + $c = bin_tail_c(S, 2), + $e = bin_tail_c(S, 4), + {'EXIT',_} = (catch bin_tail_c(S, 5)), + {'EXIT',_} = (catch bin_tail_c_var(S, 5)), + + $a = bin_tail_d(S, 0), + $b = bin_tail_d(S, 8), + $d = bin_tail_d(S, 3*8), + {'EXIT',_} = (catch bin_tail_d_dead(S, 1)), + {'EXIT',_} = (catch bin_tail_d_dead(S, 9)), + {'EXIT',_} = (catch bin_tail_d_dead(S, 5*8)), + {'EXIT',_} = (catch bin_tail_d_var(S, 1)), + + ok = bin_tail_e(<<2:2,0:1,1:5>>), + ok = bin_tail_e(<<2:2,1:1,1:5,42:64>>), + error = bin_tail_e(<<3:2,1:1,1:5,42:64>>), + error = bin_tail_e(<<>>), + ok. + +bin_tail_c(Bin, Offset) -> + Res = bin_tail_c_dead(Bin, Offset), + <<_:Offset/binary,_,Tail/binary>> = Bin, + {Res,Tail} = bin_tail_c_var(Bin, Offset), + Res. + +bin_tail_c_dead(Bin, Offset) -> + <<_:Offset/binary,C,_/binary>> = Bin, + C. + +bin_tail_c_var(Bin, Offset) -> + <<_:Offset/binary,C,Tail/binary>> = Bin, + {C,Tail}. + +bin_tail_d(Bin, BitOffset) -> + Res = bin_tail_d_dead(Bin, BitOffset), + <<_:BitOffset,_:8,Tail/binary>> = Bin, + {Res,Tail} = bin_tail_d_var(Bin, BitOffset), + Res. + +bin_tail_d_dead(Bin, BitOffset) -> + <<_:BitOffset,C,_/binary>> = Bin, + C. + +bin_tail_d_var(Bin, BitOffset) -> + <<_:BitOffset,C,Tail/binary>> = Bin, + {C,Tail}. + +bin_tail_e(Bin) -> + case bin_tail_e_dead(Bin) of + ok -> + <<_,Tail/binary>> = Bin, + Tail = bin_tail_e_var(Bin), + ok; + error -> + bin_tail_e_var(Bin) + end. + +bin_tail_e_dead(Bin) -> + case Bin of + %% The binary is aligned at the end; neither the bs_skip_bits2 nor + %% bs_test_tail2 instructions are needed. + <<2:2,_:1,1:5,_/binary>> -> ok; + _ -> error + end. + +bin_tail_e_var(Bin) -> + case Bin of + %% The binary is aligned at the end; neither the bs_skip_bits2 nor + %% bs_test_tail2 instructions are needed. + <<2:2,_:1,1:5,Tail/binary>> -> Tail; + _ -> error + end. + +%%-------------------------------------------------------------------- + +save_restore() -> + 0 = save_restore_1(<<0:2,42:6>>), + {1,3456} = save_restore_1(<<1:2,3456:14>>), + {2,7981234} = save_restore_1(<<2:2,7981234:30>>), + {3,763967493838} = save_restore_1(<<0:2,763967493838:62>>), + + A = <<" x">>, + B = <<".x">>, + C = <<"-x">>, + + {" ",<<"x">>} = lll(A), + {" ",<<"x">>} = mmm(A), + {" ",<<"x">>} = nnn(A), + {" ",<<"x">>} = ooo(A), + + {".",<<"x">>} = lll(B), + {".",<<"x">>} = mmm(B), + {".",<<"x">>} = nnn(B), + {".",<<"x">>} = ooo(B), + + {"-",<<"x">>} = lll(C), + {"-",<<"x">>} = mmm(C), + {"-",<<"x">>} = nnn(C), + {"-",<<"x">>} = ooo(C), + + Bin = <<-1:64>>, + case bad_float_unpack_match(Bin) of + -1 -> ok; + _Other -> bad_return_value_probably_NaN + end. + +save_restore_1(Bin) -> + case Bin of + <<0:2,_:6>> -> 0; + <<1:2,A:14>> -> {1,A}; + <<2:2,A:30>> -> {2,A}; + <<A:64>> -> {3,A} + end. + +lll(<<Char, Tail/binary>>) -> {[Char],Tail}. + +mmm(<<$.,$.,$., Tail/binary>>) -> Tail; +mmm(<<$\s,$-,$\s, Tail/binary>>) -> Tail; +mmm(<<Char, Tail/binary>>) -> {[Char],Tail}. %% Buggy Tail! + +nnn(<<"...", Tail/binary>>) -> Tail; +nnn(<<" - ", Tail/binary>>) -> Tail; +nnn(<<Char, Tail/binary>>) -> {[Char],Tail}. %% Buggy Tail! + +ooo(<<" - ", Tail/binary>>) -> Tail; +ooo(<<Char, Tail/binary>>) -> {[Char],Tail}. + +bad_float_unpack_match(<<F:64/float>>) -> F; +bad_float_unpack_match(<<I:64/integer-signed>>) -> I. + +%%-------------------------------------------------------------------- + +partitioned_bs_match() -> + <<1,2,3>> = partitioned_bs_match(blurf, <<42,1,2,3>>), + error = partitioned_bs_match(10, <<7,8,15,13>>), + error = partitioned_bs_match(100, {a,tuple,is,'not',a,binary}), + ok = partitioned_bs_match(0, <<>>), + fc(partitioned_bs_match, [-1,blurf], + catch partitioned_bs_match(-1, blurf)), + fc(partitioned_bs_match, [-1,<<1,2,3>>], + catch partitioned_bs_match(-1, <<1,2,3>>)), + {17,<<1,2,3>>} = partitioned_bs_match_2(1, <<17,1,2,3>>), + {7,<<1,2,3>>} = partitioned_bs_match_2(7, <<17,1,2,3>>), + + fc(partitioned_bs_match_2, [4,<<0:17>>], + catch partitioned_bs_match_2(4, <<0:17>>)), + + anything = partitioned_bs_match_3(anything, <<42>>), + ok = partitioned_bs_match_3(1, 2), + ok. + +partitioned_bs_match(_, <<42:8,T/binary>>) -> T; +partitioned_bs_match(N, _) when N > 0 -> error; +partitioned_bs_match(_, <<>>) -> ok. + +partitioned_bs_match_2(1, <<B:8,T/binary>>) -> {B,T}; +partitioned_bs_match_2(Len, <<_:8,T/binary>>) -> {Len,T}. + +partitioned_bs_match_3(Var, <<_>>) -> Var; +partitioned_bs_match_3(1, 2) -> ok. + +%%-------------------------------------------------------------------- + +function_clause() -> + ok = function_clause_1(<<0,7,0,7,42>>), + fc(function_clause_1, [<<0,1,2,3>>], + catch function_clause_1(<<0,1,2,3>>)), + fc(function_clause_1, [<<0,1,2,3>>], + catch function_clause_1(<<0,7,0,1,2,3>>)), + + ok = function_clause_2(<<0,7,0,7,42>>), + ok = function_clause_2(<<255>>), + ok = function_clause_2(<<13:4>>), + fc(function_clause_2, [<<0,1,2,3>>], + catch function_clause_2(<<0,1,2,3>>)), + fc(function_clause_2, [<<0,1,2,3>>], + catch function_clause_2(<<0,7,0,1,2,3>>)), + ok. + +function_clause_1(<<0:8,7:8,T/binary>>) -> + function_clause_1(T); +function_clause_1(<<_:8>>) -> + ok. + +function_clause_2(<<0:8,7:8,T/binary>>) -> + function_clause_2(T); +function_clause_2(<<_:8>>) -> + ok; +function_clause_2(<<_:4>>) -> + ok. + +%%-------------------------------------------------------------------- + +unit() -> + 42 = peek1(<<42>>), + 43 = peek1(<<43,1,2>>), + 43 = peek1(<<43,1,2,(-1):1>>), + 43 = peek1(<<43,1,2,(-1):2>>), + 43 = peek1(<<43,1,2,(-1):7>>), + + 99 = peek8(<<99>>), + 100 = peek8(<<100,101>>), + fc(peek8, [<<100,101,0:1>>], catch peek8(<<100,101,0:1>>)), + + 37484 = peek16(<<37484:16>>), + 37489 = peek16(<<37489:16,5566:16>>), + fc(peek16, [<<8>>], catch peek16(<<8>>)), + fc(peek16, [<<42:15>>], catch peek16(<<42:15>>)), + fc(peek16, [<<1,2,3,4,5>>], catch peek16(<<1,2,3,4,5>>)), + + 127 = peek7(<<127:7>>), + 100 = peek7(<<100:7,19:7>>), + fc(peek7, [<<1,2>>], catch peek7(<<1,2>>)), + ok. + +peek1(<<B:8,_/bitstring>>) -> B. + +peek7(<<B:7,_/binary-unit:7>>) -> B. + +peek8(<<B:8,_/binary>>) -> B. + +peek16(<<B:16,_/binary-unit:16>>) -> B. + +%%-------------------------------------------------------------------- + +shared_sub_bins() -> + {15,[<<>>,<<5>>,<<4,5>>,<<3,4,5>>,<<2,3,4,5>>]} = sum(<<1,2,3,4,5>>, [], 0), + ok. + +sum(<<B,T/binary>>, Acc, Sum) -> + sum(T, [T|Acc], Sum+B); +sum(<<>>, Last, Sum) -> {Sum,Last}. + +%%-------------------------------------------------------------------- + +bin_and_float() -> + 14.0 = bin_and_float(<<1.0/float,2.0/float,3.0/float>>, 0.0), + ok. + +bin_and_float(<<X/float,Y/float,Z/float,T/binary>>, Sum) when is_float(X), + is_float(Y), + is_float(Z) -> + bin_and_float(T, Sum+X*X+Y*Y+Z*Z); +bin_and_float(<<>>, Sum) -> Sum. + +%%-------------------------------------------------------------------- + +dec_subidentifiers() -> + {[],<<1,2,3>>} = + do_dec_subidentifiers(<<1:1,42:7,1:1,99:7,1,2,3>>, 0, [], 2), + {[5389],<<1,2,3>>} = + do_dec_subidentifiers(<<1:1,42:7,0:1,13:7,1,2,3>>, 0, [], 2), + {[3,2,1],not_a_binary} = dec_subidentifiers(not_a_binary, any, [1,2,3], 0), + ok. + +do_dec_subidentifiers(Buffer, Av, Al, Len) -> + Res = dec_subidentifiers(Buffer, Av, Al, Len), + Res = dec_subidentifiers2(Buffer, Av, Al, Len), + Res = dec_subidentifiers4(Buffer, Av, Al, Len), + Res = dec_subidentifiers3(Buffer, Av, Al, Len). + +dec_subidentifiers(Buffer, _Av, Al, 0) -> + {lists:reverse(Al),Buffer}; +dec_subidentifiers(<<1:1,H:7,T/binary>>, Av, Al, Len) -> + dec_subidentifiers(T, (Av bsl 7) bor H, Al, Len-1); +dec_subidentifiers(<<H,T/binary>>, Av, Al, Len) -> + dec_subidentifiers(T, 0, [((Av bsl 7) bor H)|Al], Len-1). + +dec_subidentifiers2(<<Buffer/binary>>, _Av, Al, 0) -> + {lists:reverse(Al),Buffer}; +dec_subidentifiers2(<<1:1,H:7,T/binary>>, Av, Al, Len) -> + dec_subidentifiers2(T, (Av bsl 7) bor H, Al, Len-1); +dec_subidentifiers2(<<H,T/binary>>, Av, Al, Len) -> + dec_subidentifiers2(T, 0, [((Av bsl 7) bor H)|Al], Len-1). + +dec_subidentifiers3(Buffer, _Av, Al, 0) when is_binary(Buffer) -> + {lists:reverse(Al),Buffer}; +dec_subidentifiers3(<<1:1,H:7,T/binary>>, Av, Al, Len) -> + dec_subidentifiers3(T, (Av bsl 7) bor H, Al, Len-1); +dec_subidentifiers3(<<H,T/binary>>, Av, Al, Len) -> + dec_subidentifiers3(T, 0, [((Av bsl 7) bor H)|Al], Len-1). + +dec_subidentifiers4(<<1:1,H:7,T/binary>>, Av, Al, Len) when Len =/= 0 -> + dec_subidentifiers4(T, (Av bsl 7) bor H, Al, Len-1); +dec_subidentifiers4(<<H,T/binary>>, Av, Al, Len) when Len =/= 0 -> + dec_subidentifiers4(T, 0, [((Av bsl 7) bor H)|Al], Len-1); +dec_subidentifiers4(Buffer, _Av, Al, 0) -> + {lists:reverse(Al),Buffer}. + +%%-------------------------------------------------------------------- + +skip_optional_tag() -> + {ok,<<>>} = skip_optional_tag(<<42>>, <<42>>), + {ok,<<>>} = skip_optional_tag(<<42,1>>, <<42,1>>), + {ok,<<1,2,3>>} = skip_optional_tag(<<42>>, <<42,1,2,3>>), + missing = skip_optional_tag(<<2:3>>, blurf), + ok. + +skip_optional_tag(<<>>, Binary) -> + {ok,Binary}; +skip_optional_tag(<<Tag,RestTag/binary>>, <<Tag,Rest/binary>>) -> + skip_optional_tag(RestTag, Rest); +skip_optional_tag(_, _) -> missing. + +%%-------------------------------------------------------------------- + +-define(DATELEN, 16). + +wfbm() -> + %% check_for_dot_or_space and get_tail is from wfbm4 by Steve Vinoski, + %% with modifications. + {nomatch,0} = check_for_dot_or_space(<<" ">>), + {nomatch,0} = check_for_dot_or_space(<<" abc">>), + {ok,<<"abcde">>} = check_for_dot_or_space(<<"abcde 34555">>), + {nomatch,0} = check_for_dot_or_space(<<".gurka">>), + {nomatch,1} = check_for_dot_or_space(<<"g.urka">>), + nomatch = get_tail(<<>>), + {ok,<<"2007/10/23/blurf">>} = get_tail(<<"200x/2007/10/23/blurf ">>), + {skip,?DATELEN+5} = get_tail(<<"200x/2007/10/23/blurf.">>), + nomatch = get_tail(<<"200y.2007.10.23.blurf ">>), + {'EXIT',_} = (catch get_tail({no,binary,at,all})), + {'EXIT',_} = (catch get_tail(no_binary)), + ok. + +check_for_dot_or_space(Bin) -> + check_for_dot_or_space(Bin, 0). + +check_for_dot_or_space(<<$\s, _/binary>>, 0) -> + {nomatch,0}; +check_for_dot_or_space(Bin, Len) -> + case Bin of + <<Front:Len/binary, $\s, _/binary>> -> + {ok,Front}; + <<_:Len/binary, $., _/binary>> -> + {nomatch,Len}; + _ -> + check_for_dot_or_space(Bin, Len+1) + end. + +get_tail(<<>>) -> + nomatch; +get_tail(Bin) -> + <<Front:?DATELEN/binary, Tail/binary>> = Bin, + case Front of + <<_:3/binary,"x/",Y:4/binary,$/,M:2/binary,$/,D:2/binary,$/>> -> + case check_for_dot_or_space(Tail) of + {ok,Match} -> + {ok,<<Y/binary,$/,M/binary,$/,D/binary,$/, Match/binary>>}; + {nomatch,Skip} -> {skip,?DATELEN + Skip} + end; + _ -> nomatch + end. + +%%-------------------------------------------------------------------- + +degenerated_match() -> + error = degenerated_match_1(<<>>), + 1 = degenerated_match_1(<<1:1>>), + 2 = degenerated_match_1(<<42,43>>), + + error = degenerated_match_2(<<>>), + no_split = degenerated_match_2(<<1,2>>), + {<<1,2,3,4>>,<<5>>} = degenerated_match_2(<<1,2,3,4,5>>), + ok. + +degenerated_match_1(<<>>) -> error; +degenerated_match_1(Bin) -> byte_size(Bin). + +degenerated_match_2(<<>>) -> error; +degenerated_match_2(Bin) -> + case byte_size(Bin) > 4 of + true -> split_binary(Bin, 4); + false -> no_split + end. + +%%-------------------------------------------------------------------- + +bs_sum() -> + 0 = bs_sum_1([]), + 0 = bs_sum_1(<<>>), + 42 = bs_sum_1([42]), + 1 = bs_sum_1(<<1>>), + 10 = bs_sum_1([1,2,3,4]), + 15 = bs_sum_1(<<1,2,3,4,5>>), + 21 = bs_sum_1([1,2,3|<<4,5,6>>]), + 15 = bs_sum_1([1,2,3|{4,5}]), + 6 = bs_sum_1([1,2,3|zero]), + 6 = bs_sum_1([1,2,3|0]), + 7 = bs_sum_1([1,2,3|one]), + + fc(catch bs_sum_1({too,big,tuple})), + fc(catch bs_sum_1([1,2,3|{too,big,tuple}])), + + [] = sneaky_alias(<<>>), + [559,387655] = sneaky_alias(id(<<559:32,387655:32>>)), + fc(sneaky_alias, [<<1>>], catch sneaky_alias(id(<<1>>))), + fc(sneaky_alias, [[1,2,3,4]], catch sneaky_alias(lists:seq(1, 4))), + ok. + +bs_sum_1(<<H,T/binary>>) -> H+bs_sum_1(T); +bs_sum_1([H|T]) -> H+bs_sum_1(T); +bs_sum_1({A,B}=_Tuple=_AliasForNoGoodReason) -> A+B; +bs_sum_1(0) -> 0; +bs_sum_1(zero=_Zero) -> 0; +bs_sum_1(one) -> 1; +bs_sum_1([]) -> 0; +bs_sum_1(<<>>) -> 0. + +sneaky_alias(<<>>=L) -> binary_to_list(L); +sneaky_alias(<<From:32,L/binary>>) -> [From|sneaky_alias(L)]. + +%%-------------------------------------------------------------------- + +coverage() -> + 0 = coverage_fold(fun(B, A) -> A+B end, 0, <<>>), + 6 = coverage_fold(fun(B, A) -> A+B end, 0, <<1,2,3>>), + fc(catch coverage_fold(fun(B, A) -> A+B end, 0, [a,b,c])), + + {<<42.0:64/float>>,float} = coverage_build(<<>>, <<42>>, float), + {<<>>,not_a_tuple} = coverage_build(<<>>, <<>>, not_a_tuple), + {<<16#76,"abc",16#A9,"abc">>,{x,42,43}} = + coverage_build(<<>>, <<16#7,16#A>>, {x,y,z}), + + [<<2>>,<<1>>] = coverage_bc(<<1,2>>, []), + + {x,<<"abc">>,z} = coverage_setelement(<<2,"abc">>, {x,y,z}), + + [42] = coverage_apply(<<42>>, [exported_id]), + 42 = coverage_external(<<42>>), + + do_coverage_bin_to_term_list([]), + do_coverage_bin_to_term_list([lists:seq(0, 10),{a,b,c},<<23:42>>]), + fc(coverage_bin_to_term_list, [<<0,0,0,7>>], + catch do_coverage_bin_to_term_list_1(<<7:32>>)), + + <<>> = coverage_per_key(<<4:32>>), + <<$a,$b,$c>> = coverage_per_key(<<7:32,"abc">>), + + ok. + +coverage_fold(Fun, Acc, <<H,T/binary>>) -> + IdFun = fun id/1, + coverage_fold(Fun, Fun(IdFun(H), IdFun(Acc)), T); +coverage_fold(Fun, Acc, <<>>) when is_function(Fun, 2) -> Acc. + +coverage_build(Acc0, <<H,T/binary>>, float) -> + Float = id(<<H:64/float>>), + Acc = <<Acc0/binary,Float/binary>>, + coverage_build(Acc, T, float); +coverage_build(Acc0, <<H,T/binary>>, Tuple0) -> + Str = id(<<H:(id(4)),(H-1):4,"abc">>), + Acc = id(<<Acc0/bitstring,Str/bitstring>>), + Tuple = setelement(2, setelement(3, Tuple0, 43), 42), + if + byte_size(Acc) > 0 -> + coverage_build(Acc, T, Tuple) + end; +coverage_build(Acc, <<>>, Tuple) -> {Acc,Tuple}. + +coverage_bc(<<H,T/binary>>, Acc) -> + B = << <<C:8>> || C <- [H] >>, + coverage_bc(T, [B|Acc]); +coverage_bc(<<>>, Acc) -> Acc. + +coverage_setelement(<<H,T1/binary>>, Tuple) when element(1, Tuple) =:= x -> + setelement(H, Tuple, T1). + +coverage_apply(<<H,T/binary>>, [F|Fs]) -> + [?MODULE:F(H)|coverage_apply(T, Fs)]; +coverage_apply(<<>>, []) -> []. + +coverage_external(<<H,T/binary>>) -> + ?MODULE:exported_id(T, T), + H. + +exported_id(I) -> id(I). + +exported_id(_, _) -> ok. + +do_coverage_bin_to_term_list(L) -> + Bin = << <<(begin BinTerm = term_to_binary(Term), + <<(byte_size(BinTerm)):32,BinTerm/binary>> end)/binary>> || + Term <- L >>, + L = do_coverage_bin_to_term_list_1(Bin), + L = do_coverage_bin_to_term_list_1(<<Bin/binary,7:32,"garbage">>), + L = do_coverage_bin_to_term_list_1(<<7:32,"garbage",Bin/binary>>). + +do_coverage_bin_to_term_list_1(Bin) -> + Res = coverage_bin_to_term_list(Bin), + Res = coverage_bin_to_term_list(Bin, []), + Res = coverage_bin_to_term_list_catch(Bin), + Res = coverage_bin_to_term_list_catch(Bin, []). + +coverage_bin_to_term_list(<<Sz:32,BinTerm:Sz/binary,T/binary>>) -> + try binary_to_term(BinTerm) of + Term -> [Term|coverage_bin_to_term_list(T)] + catch + error:badarg -> coverage_bin_to_term_list(T) + end; +coverage_bin_to_term_list(<<>>) -> []. + +coverage_bin_to_term_list(<<Sz:32,BinTerm:Sz/binary,T/binary>>, Acc) -> + try binary_to_term(BinTerm) of + Term -> coverage_bin_to_term_list(T, [Term|Acc]) + catch + error:badarg -> coverage_bin_to_term_list(T, Acc) + end; +coverage_bin_to_term_list(<<>>, Acc) -> lists:reverse(Acc). + +coverage_bin_to_term_list_catch(<<Sz:32,BinTerm:Sz/binary,T/binary>>) -> + case catch binary_to_term(BinTerm) of + {'EXIT',_} -> coverage_bin_to_term_list_catch(T); + Term -> [Term|coverage_bin_to_term_list_catch(T)] + end; +coverage_bin_to_term_list_catch(<<>>) -> []. + +coverage_bin_to_term_list_catch(<<Sz:32,BinTerm:Sz/binary,T/binary>>, Acc) -> + case catch binary_to_term(BinTerm) of + {'EXIT',_} -> coverage_bin_to_term_list_catch(T, Acc); + Term -> coverage_bin_to_term_list_catch(T, [Term|Acc]) + end; +coverage_bin_to_term_list_catch(<<>>, Acc) -> lists:reverse(Acc). + +coverage_per_key(<<BinSize:32,Bin/binary>> = B) -> + true = (byte_size(B) =:= BinSize), + Bin. + +%%-------------------------------------------------------------------- + +multiple_uses() -> + {344,62879,345,<<245,159,1,89>>} = multiple_uses_1(<<1,88,245,159,1,89>>), + true = multiple_uses_2(<<0,0,197,18>>), + <<42,43>> = multiple_uses_3(<<0,0,42,43>>, fun id/1), + ok. + +multiple_uses_1(<<X:16,Tail/binary>>) -> + %% NOT OPTIMIZED: sub binary is matched or used in more than one place + {Y,Z} = multiple_uses_match(Tail), + {X,Y,Z,Tail}. + +multiple_uses_2(<<_:16,Tail/binary>>) -> + %% NOT OPTIMIZED: sub binary is matched or used in more than one place + multiple_uses_cmp(Tail, Tail). + +multiple_uses_3(<<_:16,Tail/binary>>, Fun) -> + %% NOT OPTIMIZED: sub binary is used or returned + Fun(Tail). + +multiple_uses_match(<<Y:16,Z:16>>) -> {Y,Z}. + +multiple_uses_cmp(<<Y:16>>, <<Y:16>>) -> true; +multiple_uses_cmp(<<_:16>>, <<_:16>>) -> false. + +%%-------------------------------------------------------------------- + +zero_label() -> + <<"nosemouth">> = read_pols(<<"FACE","nose","mouth">>), + <<"CE">> = read_pols(<<"noFACE">>), + ok. + +read_pols(Data) -> + <<PolygonType:4/binary,Rest/binary>> = Data, + %% Intentional warning. + _ = (PolygonType == <<"FACE">>) or (PolygonType == <<"PTCH">>), + Rest. + +%%-------------------------------------------------------------------- + +followed_by_catch() -> + ok = handle(<<0,1,2,3,4,5>>). + +-record(rec,{field}). +handle(<<>>) -> ok; +handle(Msg) -> + <<_DataLen:16, Rest/binary>> = Msg, + case catch fooX:func() of + [X] -> + X#rec.field; + _ -> + ok + end, + handle(Rest). + +%%-------------------------------------------------------------------- + +matching_meets_construction() -> + Bin = id(<<"abc">>), + Len = id(2), + Tail0 = id(<<1,2,3,4,5>>), + <<_:Len/binary,Tail/binary>> = Tail0, + Res = <<Tail/binary,Bin/binary>>, + <<3,4,5,"abc">> = Res, + {'EXIT',{badarg,_}} = (catch matching_meets_construction_1(<<"Abc">>)), + {'EXIT',{badarg,_}} = (catch matching_meets_construction_2(<<"Abc">>)), + <<"Bbc">> = matching_meets_construction_3(<<"Abc">>), + <<1,2>> = encode_octet_string(<<1,2,3>>, 2), + ok. + +matching_meets_construction_1(<<"A",H/binary>>) -> <<"B",H>>. + +matching_meets_construction_2(<<"A",H/binary>>) -> <<"B",H/float>>. + +matching_meets_construction_3(<<"A",H/binary>>) -> <<"B",H/binary>>. + +encode_octet_string(<<OctetString/binary>>, Len) -> + <<OctetString:Len/binary-unit:8>>. + +%%-------------------------------------------------------------------- + +simon() -> + one = simon(blurf, <<>>), + two = simon(0, <<42>>), + fc(simon, [17,<<1>>], catch simon(17, <<1>>)), + fc(simon, [0,<<1,2,3>>], catch simon(0, <<1,2,3>>)), + + one = simon2(blurf, <<9>>), + two = simon2(0, <<9,1>>), + fc(simon2, [0,<<9,10,11>>], catch simon2(0, <<9,10,11>>)), + ok. + +simon(_, <<>>) -> one; +simon(0, <<_>>) -> two. + +simon2(_, <<9>>) -> one; +simon2(0, <<_:16>>) -> two. + +%%-------------------------------------------------------------------- +%% OTP-7113: Crash in v3_codegen. + +matching_and_andalso() -> + ok = matching_and_andalso_1(<<1,2,3>>, 3), + {'EXIT',{function_clause,_}} = (catch matching_and_andalso_1(<<1,2,3>>, -8)), + {'EXIT',{function_clause,_}} = (catch matching_and_andalso_1(<<1,2,3>>, blurf)), + {'EXIT',{function_clause,_}} = (catch matching_and_andalso_1(<<1,2,3>>, 19)), + + {"abc",<<"xyz">>} = matching_and_andalso_2("abc", <<"-xyz">>), + {"abc",<<"">>} = matching_and_andalso_2("abc", <<($a-1)>>), + {"abc",<<"">>} = matching_and_andalso_2("abc", <<($z+1)>>), + {"abc",<<"">>} = matching_and_andalso_2("abc", <<($A-1)>>), + {"abc",<<"">>} = matching_and_andalso_2("abc", <<($Z+1)>>), + error = matching_and_andalso_2([], <<>>), + error = matching_and_andalso_2([], <<$A>>), + error = matching_and_andalso_2([], <<$Z>>), + error = matching_and_andalso_2([], <<$a>>), + error = matching_and_andalso_2([], <<$z>>), + ok. + +matching_and_andalso_1(<<Bitmap/binary>>, K) + when is_integer(K) andalso size(Bitmap) >= K andalso 0 < K -> ok. + +matching_and_andalso_2(Datetime, <<H,T/binary>>) + when not ((H >= $a) andalso (H =< $z)) andalso + not ((H >= $A) andalso (H =< $Z)) -> + {Datetime,T}; +matching_and_andalso_2(_, _) -> error. + +%%-------------------------------------------------------------------- +%% Thanks to Tomas Stejskal. + +otp_7188() -> + MP3 = <<84,65,71,68,117,154,105,232,107,121,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,68,97,110,105,101,108,32,76, + 97,110,100,97,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,66, + 101,115,116,32,79,102,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,50,48,48,48,50,48,48,48,32,45,32,66,101,115, + 116,32,79,102,32,32,32,32,32,32,32,32,32,32,32,32,32,32, + 32,32,12>>, + {ok,{"ID3v1", + [{title,<<68,117,154,105,232,107,121>>}, + {artist,<<"Daniel Landa">>}, + {album,<<"Best Of">>}]}} = parse_v1_or_v11_tag(MP3), + ok. + +parse_v1_or_v11_tag(<<"TAG", Title:30/binary, + Artist:30/binary, Album:30/binary, + _Year:4/binary, _Comment:28/binary, + 0:8, Track:8, _Genre:8>>) -> + {ok, + {"ID3v1.1", + [{track, Track}, {title, trim(Title)}, + {artist, trim(Artist)}, {album, trim(Album)}]}}; +parse_v1_or_v11_tag(<<"TAG", Title:30/binary, + Artist:30/binary, Album:30/binary, + _Year:4/binary, _Comment:30/binary, + _Genre:8>>) -> + {ok, + {"ID3v1", + [{title, trim(Title)}, + {artist, trim(Artist)}, + {album, trim(Album)}]}}; +parse_v1_or_v11_tag(_) -> + error. + +trim(Bin) -> + list_to_binary(trim_blanks(binary_to_list(Bin))). + +trim_blanks(L) -> + lists:reverse(skip_blanks_and_zero(lists:reverse(L))). + +skip_blanks_and_zero([$\s|T]) -> + skip_blanks_and_zero(T); +skip_blanks_and_zero([0|T]) -> + skip_blanks_and_zero(T); +skip_blanks_and_zero(L) -> + L. + +%%-------------------------------------------------------------------- +%% OTP-7233. Record and binary matching optimizations clashed. +%% Thanks to Vladimir Klebansky. + +-record(rec_otp_7233, {key, val}). + +otp_7233() -> + otp_7233_1(#rec_otp_7233{key = <<"XXabcde">>,val=[{"xxxxxxxx",42}]}), + [<<"XXabcde">>,{"xxxxxxxx",42}] = get(io_format), + erase(io_format), + otp_7233_1(#rec_otp_7233{key = <<"XXabcde">>,val=[]}), + undefined = get(io_format), + ok. + +otp_7233_1(Rec) -> + <<K:2/binary,_Rest:5/binary>> = Rec#rec_otp_7233.key, + case K of + <<"XX">> -> + Value = Rec#rec_otp_7233.val, + case lists:keysearch("xxxxxxxx", 1, Value) of + {value,T} -> put(io_format, [Rec#rec_otp_7233.key,T]); + false -> ok + end; + _ -> ok + end. + +%%-------------------------------------------------------------------- + +otp_7240() -> + a = otp_7240_a(0, <<>>), + b = otp_7240_a(1, 2), + + a = otp_7240_b(anything, <<>>), + b = otp_7240_b(1, {x,y}), + + a = otp_7240_c(anything, <<>>), + b = otp_7240_c(1, <<2>>), + + a = otp_7240_d(anything, <<>>), + b = otp_7240_d(again, <<2>>), + + a = otp_7240_e(anything, <<>>), + b = otp_7240_e(1, 41), + + a = otp_7240_f(anything, <<>>), + b = otp_7240_f(1, {}), + + ok. + +otp_7240_a(_, <<>>) -> a; +otp_7240_a(1, 2) -> b. + +otp_7240_b(_, <<>>) -> a; +otp_7240_b(1, {_,_}) -> b. + +otp_7240_c(_, <<>>) -> a; +otp_7240_c(1, <<2>>) -> b. + +otp_7240_d(_, <<>>) -> a; +otp_7240_d(_, <<2>>) -> b. + +otp_7240_e(_, <<>>) -> a; +otp_7240_e(1, B) when B < 42 -> b. + +otp_7240_f(_, <<>>) -> a; +otp_7240_f(1, B) when is_tuple(B) -> b. + +%%-------------------------------------------------------------------- + +otp_7498() -> + <<1,2,3>> = otp_7498_foo(<<1,2,3>>, 0), + <<2,3>> = otp_7498_foo(<<1,2,3>>, 1), + <<1,2,3>> = otp_7498_foo(<<1,2,3>>, 2), + + <<1,2,3>> = otp_7498_bar(<<1,2,3>>, 0), + <<2,3>> = otp_7498_bar(<<1,2,3>>, 1), + <<1,2,3>> = otp_7498_bar(<<1,2,3>>, 2), + <<>> = otp_7498_bar(<<>>, 2), + <<1,2,3>> = otp_7498_bar(<<1,2,3>>, 3), + ok. + +otp_7498_foo(Bin, 0) -> + otp_7498_foo(Bin, 42); +otp_7498_foo(<<_A, Rest/bitstring>>, 1) -> + otp_7498_foo(Rest, 43); +otp_7498_foo(Bin, _I) -> + Bin. + +otp_7498_bar(Bin, 0) -> + otp_7498_bar(Bin, 42); +otp_7498_bar(<<_A, Rest/bitstring>>, 1) -> + otp_7498_bar(Rest, 43); +otp_7498_bar(<<>>, 2) -> + otp_7498_bar(<<>>, 44); +otp_7498_bar(Bin, _I) -> + Bin. + +%%-------------------------------------------------------------------- + +match_string() -> + %% To make sure that native endian really is handled correctly + %% (i.e. that the compiler does not attempt to use bs_match_string/4 + %% instructions for native segments), running this test is not enough. + %% Either examine the generated for do_match_string_native/1 or + %% check the coverage for the v3_kernel module. + case erlang:system_info(endian) of + little -> + do_match_string_native(<<$a,0,$b,0>>); + big -> + do_match_string_native(<<0,$a,0,$b>>) + end, + do_match_string_big(<<0,$a,0,$b>>), + do_match_string_little(<<$a,0,$b,0>>), + + do_match_string_big_signed(<<255,255>>), + do_match_string_little_signed(<<255,255>>), + + plain = no_match_string_opt(<<"abc">>), + strange = no_match_string_opt(<<$a:9,$b:9,$c:9>>), + ok. + +do_match_string_native(<<$a:16/native,$b:16/native>>) -> ok. + +do_match_string_big(<<$a:16/big,$b:16/big>>) -> ok. + +do_match_string_little(<<$a:16/little,$b:16/little>>) -> ok. + +do_match_string_big_signed(<<(-1):16/signed>>) -> ok. + +do_match_string_little_signed(<<(-1):16/little-signed>>) -> ok. + +no_match_string_opt(<<"abc">>) -> plain; +no_match_string_opt(<<$a:9,$b:9,$c:9>>) -> strange. + +%%-------------------------------------------------------------------- +%% OTP-7591: A zero-width segment in matching would crash the compiler. + +zero_width() -> + <<Len:16/little, Str:Len/binary, 0:0>> = <<2, 0, $h, $i, 0:0>>, + 2 = Len, + Str = <<"hi">>, + %% Match sure that values that cannot fit in a segment will not match. + case id(<<0:8>>) of + <<256:8>> -> error; + _ -> ok + end. + +%%-------------------------------------------------------------------- +%% OTP_7650: A invalid size for binary segments could crash the compiler. + +bad_size() -> + Tuple = {a,b,c}, + {'EXIT',{{badmatch,<<>>},_}} = (catch <<32:Tuple>> = id(<<>>)), + Binary = <<1,2,3>>, + {'EXIT',{{badmatch,<<>>},_}} = (catch <<32:Binary>> = id(<<>>)), + ok. + +%%-------------------------------------------------------------------- + +haystack() -> + <<0:10/unit:8>> = haystack_1(<<0:10/unit:8>>), + [<<0:10/unit:8>>, + <<0:20/unit:8>>] = haystack_2(<<1:8192>>), + ok. + +%% Used to crash the compiler. +haystack_1(Haystack) -> + Subs = [10], + [begin + <<B:Y/binary>> = Haystack, + B + end || Y <- Subs], + Haystack. + +%% There would be an incorrect badmatch exception. +haystack_2(Haystack) -> + Subs = [{687,10},{369,20}], + [begin + <<_:X/binary,B:Y/binary,_/binary>> = Haystack, + B + end || {X,Y} <- Subs]. + +fc({'EXIT',{function_clause,_}}) -> ok. + +fc(Name, Args, {'EXIT',{function_clause,[{?MODULE,Name,Args,_}|_]}}) -> ok; +fc(Name, Args, {'EXIT',{function_clause,[{?MODULE,Name,Arity,_}|_]}}) + when length(Args) =:= Arity -> + true = test_server:is_native(?MODULE). + +%%-------------------------------------------------------------------- +%% Cover the clause handling bs_context to binary in +%% beam_block:initialized_regs/2. +cover_beam_bool() -> + ok = do_cover_beam_bool(<<>>, 3), + <<19>> = do_cover_beam_bool(<<19>>, 2), + <<42>> = do_cover_beam_bool(<<42>>, 1), + <<17>> = do_cover_beam_bool(<<13,17>>, 0), + ok. + +do_cover_beam_bool(Bin, X) when X > 0 -> + if + X =:= 1; X =:= 2 -> + Bin; + true -> + ok + end; +do_cover_beam_bool(<<_,Bin/binary>>, X) -> + do_cover_beam_bool(Bin, X+1). + +%%-------------------------------------------------------------------- + +matched_out_size() -> + {253,16#DEADBEEF} = mos_int(<<8,253,16#DEADBEEF:32>>), + {6,16#BEEFDEAD} = mos_int(<<3,6:3,16#BEEFDEAD:32>>), + {53,16#CAFEDEADBEEFCAFE} = mos_int(<<16,53:16,16#CAFEDEADBEEFCAFE:64>>), + {23,16#CAFEDEADBEEFCAFE} = mos_int(<<5,23:5,16#CAFEDEADBEEFCAFE:64>>), + + {<<1,2,3>>,4} = mos_bin(<<3,1,2,3,4,3>>), + {<<1,2,3,7>>,19,42} = mos_bin(<<4,1,2,3,7,19,4,42>>), + <<1,2,3,7>> = mos_bin(<<4,1,2,3,7,"abcdefghij">>), + ok. + +mos_int(<<L,I:L,X:32>>) -> + {I,X}; +mos_int(<<L,I:L,X:64>>) -> + {I,X}. + +mos_bin(<<L,Bin:L/binary,X:8,L>>) -> + L = byte_size(Bin), + {Bin,X}; +mos_bin(<<L,Bin:L/binary,X:8,L,Y:8>>) -> + L = byte_size(Bin), + {Bin,X,Y}; +mos_bin(<<L,Bin:L/binary,"abcdefghij">>) -> + L = byte_size(Bin), + Bin. + +%%-------------------------------------------------------------------- + +follow_fail_br() -> + 42 = ffb_1(<<0,1>>, <<0>>), + 8 = ffb_1(<<0,1>>, [a]), + 42 = ffb_2(<<0,1>>, <<0>>, 17), + 8 = ffb_2(<<0,1>>, [a], 0), + ok. + +ffb_1(<<_,T/bitstring>>, List) -> + case List of + <<_>> -> + 42; + [_|_] -> + %% The fail branch of the bs_start_match2 instruction pointing + %% to here would be ignored, making the compiler incorrectly + %% assume that the delayed sub-binary optimization was safe. + bit_size(T) + end. + +ffb_2(<<_,T/bitstring>>, List, A) -> + case List of + <<_>> when A =:= 17 -> 42; + [_|_] -> bit_size(T) + end. + +%%-------------------------------------------------------------------- + +no_partition() -> + one = no_partition_1(<<"string">>, a1), + {two,<<"string">>} = no_partition_1(<<"string">>, a2), + {two,<<>>} = no_partition_1(<<>>, a2), + {two,a} = no_partition_1(a, a2), + three = no_partition_1(undefined, a3), + {four,a,[]} = no_partition_1([a], a4), + {five,a,b} = no_partition_1({a,b}, a5), + + one = no_partition_2(<<"string">>, a1), + two = no_partition_2(<<"string">>, a2), + two = no_partition_2(<<>>, a2), + two = no_partition_2(a, a2), + three = no_partition_2(undefined, a3), + four = no_partition_2(42, a4), + five = no_partition_2([], a5), + six = no_partition_2(42.0, a6), + ok. + +no_partition_1(<<"string">>, a1) -> one; +no_partition_1(V, a2) -> {two,V}; +no_partition_1(undefined, a3) -> three; +no_partition_1([H|T], a4) -> {four,H,T}; +no_partition_1({A,B}, a5) -> {five,A,B}. + +no_partition_2(<<"string">>, a1) -> one; +no_partition_2(_, a2) -> two; +no_partition_2(undefined, a3) -> three; +no_partition_2(42, a4) -> four; +no_partition_2([], a5) -> five; +no_partition_2(42.0, a6) -> six. + +%%-------------------------------------------------------------------- + +calling_a_binary() -> + [] = call_binary(<<>>, []), + {'EXIT',{badarg,_}} = (catch call_binary(<<1>>, [])), + {'EXIT',{badarg,_}} = (catch call_binary(<<1,2,3>>, [])), + ok. + +call_binary(<<>>, Acc) -> + Acc; +call_binary(<<H,T/bits>>, Acc) -> + T(<<Acc/binary,H>>). + +%%-------------------------------------------------------------------- + +binary_in_map() -> + ok = match_binary_in_map(#{key => <<42:8>>}), + {'EXIT',{{badmatch,#{key := 1}},_}} = + (catch match_binary_in_map(#{key => 1})), + {'EXIT',{{badmatch,#{key := <<1023:16>>}},_}} = + (catch match_binary_in_map(#{key => <<1023:16>>})), + {'EXIT',{{badmatch,#{key := <<1:8>>}},_}} = + (catch match_binary_in_map(#{key => <<1:8>>})), + {'EXIT',{{badmatch,not_a_map},_}} = + (catch match_binary_in_map(not_a_map)), + ok. + +match_binary_in_map(Map) -> + case 8 of + N -> + #{key := <<42:N>>} = Map, + ok + end. + +%%-------------------------------------------------------------------- + +match_string_opt() -> + {x,<<1,2,3>>,{<<1>>,{v,<<1,2,3>>}}} = match_string_opt({<<1>>,{v,<<1,2,3>>}}), + ok. + +match_string_opt({<<1>>,{v,V}}=T) -> + {x,V,T}. + +%%-------------------------------------------------------------------- +%% If 'bin_opt_info' was given the warning would lack filename and +%% line number. + +map_and_binary() -> + {<<"10">>,<<"37">>,<<"am">>} = do_map_and_binary(<<"10:37am">>), + Map1 = #{time => "noon"}, + {ok,Map1} = do_map_and_binary(Map1), + Map2 = #{hour => 8, min => 42}, + {8,42,Map2} = do_map_and_binary(Map2), + ok. + +do_map_and_binary(<<Hour:2/bytes, $:, Min:2/bytes, Rest/binary>>) -> + {Hour, Min, Rest}; +do_map_and_binary(#{time := _} = T) -> + {ok, T}; +do_map_and_binary(#{hour := Hour, min := Min} = T) -> + {Hour, Min, T}. + +%%-------------------------------------------------------------------- +%% Unsafe caching of branch outcomes in beam_bsm would cause the +%% delayed creation of sub-binaries optimization to be applied even +%% when it was unsafe. + +unsafe_branch_caching() -> + <<>> = do_unsafe_branch_caching(<<42,1>>), + <<>> = do_unsafe_branch_caching(<<42,2>>), + <<>> = do_unsafe_branch_caching(<<42,3>>), + <<17,18>> = do_unsafe_branch_caching(<<42,3,17,18>>), + <<>> = do_unsafe_branch_caching(<<1,3,42,2>>), + ok. + +do_unsafe_branch_caching(<<Code/integer, Bin/binary>>) -> + <<C1/integer, B1/binary>> = Bin, + case C1 of + X when X =:= 1 orelse X =:= 2 -> + Bin2 = <<>>; + _ -> + Bin2 = B1 + end, + case Code of + 1 -> do_unsafe_branch_caching(Bin2); + _ -> Bin2 + end. + +%%-------------------------------------------------------------------- + +check(F, R) -> + R = F(). + +id(I) -> I. |