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Diffstat (limited to 'lib/hipe/test/bs_SUITE_data/bs_pmatch.erl')
-rw-r--r-- | lib/hipe/test/bs_SUITE_data/bs_pmatch.erl | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/lib/hipe/test/bs_SUITE_data/bs_pmatch.erl b/lib/hipe/test/bs_SUITE_data/bs_pmatch.erl new file mode 100644 index 0000000000..9474ffea4a --- /dev/null +++ b/lib/hipe/test/bs_SUITE_data/bs_pmatch.erl @@ -0,0 +1,269 @@ +%% -*- erlang-indent-level: 2 -*- +%%-------------------------------------------------------------------- +%% Tests that basic cases of binary pattern matching work +%%-------------------------------------------------------------------- +-module(bs_pmatch). + +-export([test/0]). + +test() -> + %% construct some binaries + Bin42 = <<42>>, + Bin = <<12,17,42,0,0,0>>, + BinSS = <<0,1,0,0,0>>, + %% do some pattern matching + ok = pm_const(Bin42), + <<17,42,0,0,0>> = pm_tail(Bin), + 42 = pm_little(<<0:1,42:7>>), + 42 = pm_rec(Bin), + 30 = pm_rec_acc(<<1,2,3,4,5,6,7,8,9,10>>, 0), + 42 = pm_binary_tuple(Bin42), + -1 = pm_with_illegal_float(), + %% do some pattern matching with bound segments + ok = pm_bound_var(), + ok = pm_bound_tail(), + %% do some tests with floating point numbers + ok = pm_float(), + ok = pm_float_little(), + %% do some pattern matching with segments of unknown sizes + {<<17>>, <<42,0,0,0>>} = pm_body_s(Bin, 1), + {<<17>>, <<42,0,0,0>>} = pm_body_ss(Bin, 1, 4), + {<<45>>, <<>>} = pm_size_split(<<1:16,45>>), + {<<45>>, <<46,47>>} = pm_size_split(<<1:16,45,46,47>>), + {<<45,46>>, <<47>>} = pm_size_split(<<2:16,45,46,47>>), + {<<45,46>>, <<47>>} = pm_size_split_2(2, <<2:16,45,46,47>>), + {'EXIT',{function_clause,_}} = (catch pm_size_split_2(42, <<2:16,45,46,47>>)), + {<<45,46,47>>, <<48>>} = pm_sizes_split(<<16:8,3:16,45,46,47,48>>), + <<"cdef">> = pm_skip_segment(<<2:8, "abcdef">>), + -1 = pm_double_size_in_head(BinSS), + -1 = pm_double_size_in_body(BinSS), + %% and finally some cases which were problematic for various reasons + ok = pm_bigs(), + ok = pm_sean(), + ok = pm_bin8(<<1,2,3,4,5,6,7,8>>), + ok = pm_bs_match_string(), + ok = pm_till_gc(), + ok. + +%%-------------------- +%% Test cases below +%%-------------------- + +pm_const(<<42>>) -> + ok. + +pm_tail(<<12, Bin/binary>>) -> + Bin. + +pm_little(<<_:1, X:15/little>>) -> + {wrong, X}; +pm_little(<<_:1, X:7/little>>) -> + X. + +pm_rec(<<12, Bin/binary>>) -> + pm_rec(Bin); +pm_rec(<<17, Word:4/little-signed-integer-unit:8>>) -> + Word. + +pm_rec_acc(<<_:4, A:4, Rest/binary>>, Acc) -> + case Rest of + <<X, Y, 9, NewRest/binary>> -> + pm_rec_acc(NewRest, X+Y+Acc); + <<X, 5, NewRest/binary>> -> + pm_rec_acc(NewRest, X+Acc); + <<2, NewRest/binary>> -> + pm_rec_acc(NewRest, 1+Acc); + <<NewRest/binary>> -> + pm_rec_acc(NewRest, A+Acc) + end; +pm_rec_acc(<<>>, Acc) -> + Acc. + +pm_binary_tuple(<<X>>) -> + X; +pm_binary_tuple({Y, Z}) -> + Y + Z. + +pm_with_illegal_float() -> + Bin = <<-1:64>>, % create a binary which is illegal as float + pm_float_integer(Bin). % try to match it out as a float + +pm_float_integer(<<F:64/float>>) -> F; +pm_float_integer(<<I:64/integer-signed>>) -> I. + +%%-------------------------------------------------------------------- +%% Some tests with bound variables in segments + +pm_bound_var() -> + ok = pm_bound_var(42, 13, <<42,13>>), + no = pm_bound_var(42, 13, <<42,255>>), + no = pm_bound_var(42, 13, <<154,255>>), + ok. + +pm_bound_var(A, B, <<A:8, B:8>>) -> ok; +pm_bound_var(_, _, _) -> no. + +pm_bound_tail() -> + ok = pm_bound_tail(<<>>, <<13,14>>), + ok = pm_bound_tail(<<2,3>>, <<1,1,2,3>>), + no = pm_bound_tail(<<2,3>>, <<1,1,2,7>>), + no = pm_bound_tail(<<2,3>>, <<1,1,2,3,4>>), + no = pm_bound_tail(<<2,3>>, <<>>), + ok. + +pm_bound_tail(T, <<_:16, T/binary>>) -> ok; +pm_bound_tail(_, _) -> no. + +%%-------------------------------------------------------------------- +%% Floating point tests + +pm_float() -> + F = f1(), + G = f_one(), + G = match_float(<<63,128,0,0>>, 32, 0), + G = match_float(<<63,240,0,0,0,0,0,0>>, 64, 0), + fcmp(F, match_float(<<F:32/float>>, 32, 0)), + fcmp(F, match_float(<<F:64/float>>, 64, 0)), + fcmp(F, match_float(<<1:1,F:32/float,127:7>>, 32, 1)), + fcmp(F, match_float(<<1:1,F:64/float,127:7>>, 64, 1)), + fcmp(F, match_float(<<1:13,F:32/float,127:3>>, 32, 13)), + fcmp(F, match_float(<<1:13,F:64/float,127:3>>, 64, 13)), + ok. + +fcmp(F1, F2) when (F1 - F2) / F2 < 0.0000001 -> ok. + +match_float(Bin0, Fsz, I) -> + Bin = make_sub_bin(Bin0), + Bsz = bit_size(Bin), + Tsz = Bsz - Fsz - I, + <<_:I,F:Fsz/float,_:Tsz>> = Bin, + F. + +pm_float_little() -> + F = f2(), + G = f_one(), + G = match_float_little(<<0,0,0,0,0,0,240,63>>, 64, 0), + G = match_float_little(<<0,0,128,63>>, 32, 0), + fcmp(F, match_float_little(<<F:32/float-little>>, 32, 0)), + fcmp(F, match_float_little(<<F:64/float-little>>, 64, 0)), + fcmp(F, match_float_little(<<1:1,F:32/float-little,127:7>>, 32, 1)), + fcmp(F, match_float_little(<<1:1,F:64/float-little,127:7>>, 64, 1)), + fcmp(F, match_float_little(<<1:13,F:32/float-little,127:3>>, 32, 13)), + fcmp(F, match_float_little(<<1:13,F:64/float-little,127:3>>, 64, 13)), + ok. + +match_float_little(Bin0, Fsz, I) -> + Bin = make_sub_bin(Bin0), + Bsz = bit_size(Bin), + Tsz = Bsz - Fsz - I, + <<_:I, F:Fsz/float-little, _:Tsz>> = Bin, + F. + +make_sub_bin(Bin0) -> + Sz = byte_size(Bin0), + Bin1 = <<37,Bin0/binary,38,39>>, + <<_:8,Bin:Sz/binary,_:8,_:8>> = Bin1, + Bin. + +f1() -> 3.1415. + +f2() -> 2.7133. + +f_one() -> 1.0. + +%%-------------------------------------------------------------------- +%% Some tests using size fields specified within the binary +pm_body_s(Bin, S1) -> + <<12, B1:S1/binary, B2:4/binary>> = Bin, %% 4 is hard-coded + {B1, B2}. + +pm_body_ss(Bin, S1, S2) -> + <<12, B1:S1/binary, B2:S2/binary>> = Bin, + {B1, B2}. + +pm_size_split(<<N:16, B:N/binary, T/binary>>) -> + {B, T}. + +pm_size_split_2(N, <<N:16, B:N/binary, T/binary>>) -> + {B, T}. + +pm_sizes_split(<<N0:8, N:N0, B:N/binary, T/binary>>) -> + {B, T}. + +pm_skip_segment(<<N:8, _:N/binary, T/binary>>) -> T. + +%%-------------------------------------------------------------------- +%% Some tests using multiple occurrences of size fields +pm_double_size_in_head(<<S:16, _:S/binary, _:S/binary, _/binary>>) -> + -S. + +pm_double_size_in_body(Bin) -> + <<S:16, _:S/binary, _:S/binary, _/binary>> = Bin, + -S. + +%%-------------------------------------------------------------------- +%% matching with 64-bit integers which become big nums +-define(BIG, 16#7fffffff7fffffff). + +pm_bigs() -> + <<X:64/little>> = <<?BIG:64/little>>, + true = (X =:= big()), + <<Y:64>> = <<?BIG:64>>, + true = (Y =:= big()), + ok. + +big() -> ?BIG. + +%%-------------------------------------------------------------------- + +pm_sean() -> + small = sean1(<<>>), + small = sean1(<<1>>), + small = sean1(<<1,2>>), + small = sean1(<<1,2,3>>), + large = sean1(<<1,2,3,4>>), + small = sean1(<<4>>), + small = sean1(<<4,5>>), + small = sean1(<<4,5,6>>), + {'EXIT', {function_clause, _}} = (catch sean1(<<4,5,6,7>>)), + ok. + +sean1(<<B/binary>>) when byte_size(B) < 4 -> small; +sean1(<<1, _/binary>>) -> large. + +%%-------------------------------------------------------------------- +%% Crashed on SPARC due to a bug in linear scan register allocator +pm_bin8(<<A, B, C, D, E, F, G, H>>) -> + 10 = add4(A, B, C, D), + 26 = add4(E, F, G, H), + ok. + +add4(X, Y, Z, W) -> + X + Y + Z + W. + +%%-------------------------------------------------------------------- +%% Cases that exposed bugs in the handling of bs_match_string with an +%% empty destination list. Reported on 2013/2/12 and fixed 2013/3/10. + +pm_bs_match_string() -> + Bin = <<42,42>>, + Bin = pm_match_string_head(Bin), + ok = (pm_match_string_fun())(Bin). + +pm_match_string_head(<<42, _/bits>> = B) -> B. + +pm_match_string_fun() -> + fun (<<X, _/bits>>) when X =:= 42 -> ok end. + +%%-------------------------------------------------------------------- +%% Match a lot to force a garbage collection which exposed a bug + +pm_till_gc() -> + Bin = <<16#76543210:32>>, + 16#76543210 = pm_a_lot(Bin, 1000000), + ok. + +pm_a_lot(<<X:32>>, 0) -> + X; +pm_a_lot(<<X:32>>, N) -> + pm_a_lot(<<X:32>>, N-1). |