aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/test/bs_construct_SUITE.erl
blob: 7fdf36711b1c0cfd40569b5d3a21cbd00affcb2d (plain) (tree)
1
2
3
4
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555


                   
                                                        


















                                                                         

                                                                    




                                                                     
                                    
 
                                                    
 
                                         
 
         



                                                                          



            





                         
                                     
           

                                    
           


















































































































































































































































































































































































































































































































                                                                                                      




                                       











                                                         



                                                                   















                                                                                







                                                                   





























































































































































































































                                                                                   














                                                                 

           
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1999-2011. 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%
%%
%% Purpose : Common utilities used by several optimization passes.
%% 

-module(bs_construct_SUITE).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	 init_per_group/2,end_per_group/2,
	 test1/1, test2/1, test3/1, test4/1, test5/1, testf/1,
	 not_used/1, in_guard/1,
	 mem_leak/1, coerce_to_float/1, bjorn/1,
	 huge_float_field/1, huge_binary/1, system_limit/1, badarg/1,
	 copy_writable_binary/1, kostis/1, dynamic/1, bs_add/1,
	 otp_7422/1, zero_width/1]).

-include_lib("test_server/include/test_server.hrl").

suite() -> [{ct_hooks,[ts_install_cth]}].

all() -> 
    [test1, test2, test3, test4, test5, testf, not_used,
     in_guard, mem_leak, coerce_to_float, bjorn,
     huge_float_field, huge_binary, system_limit, badarg,
     copy_writable_binary, kostis, dynamic, bs_add, otp_7422, zero_width].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.

big(1) ->
    57285702734876389752897683.

i(X) -> X.

r(L) ->
    lists:reverse(L).

-define(T(B, L), {B, ??B, L}).
-define(N(B), {B, ??B, unknown}).

-define(FAIL(Expr), ?line fail_check(catch Expr, ??Expr, [])).

-define(FAIL_VARS(Expr, Vars), ?line fail_check(catch Expr, ??Expr, Vars)).

l(I_13, I_big1) ->
    [
     ?T(<<-43>>,
	[256-43]),
     ?T(<<56>>,
	[56]),
     ?T(<<1,2>>,
	[1, 2]),
     ?T(<<4:4, 7:4>>,
	[4*16+7]),
     ?T(<<777:16/big>>,
	[3, 9]),
     ?T(<<777:16/little>>,
	[9, 3]),
     ?T(<<0.0:32/float>>,
	[0,0,0,0]),
     ?T(<<0.125:32/float>>,
	[62,0,0,0]),
     ?T(<<0.125:32/little-float>>,
	[0,0,0,62]),
     ?T(<<I_big1:32>>,
	[138, 99, 0, 147]),
     ?T(<<57285702734876389752897684:32>>,
	[138, 99, 0, 148]),
     ?T(<<I_big1:32/little>>,
	r([138, 99, 0, 147])),
     ?T(<<-1:17/unit:8>>,
	lists:duplicate(17, 255)),

     ?T(<<I_13>>,
	[13]),

     ?T(<<4:8/unit:2,5:2/unit:8>>,
	[0, 4, 0, 5]),

     ?T(<<1:1, 0:6, 1:1>>,
	[129]),
     ?T(<<1:1/little, 0:6/little, 1:1/little>>,
	[129]),

     ?T(<<<<1,2>>/binary>>,
	[1, 2]),
     ?T(<<<<1,2>>:1/binary>>,
	[1]),
     ?T(<<4,3,<<1,2>>:1/binary>>,
	[4,3,1]),

     ?T(<<(256*45+47)>>,
	[47]),

     ?T(<<57:0>>,
	[]),

     ?T(<<"apa">>,
	"apa"),

     ?T(<<1:3,"string",9:5>>,
	[46,110,142,77,45,204,233]),

     ?T(<<>>,
	[]),

     ?T(<<37.98:64/native-float>>,
	native_3798()),

     ?T(<<32978297842987249827298387697777669766334937:128/native-integer>>,
	native_bignum()),

     %% Unit tests.
     ?T(<<<<5:3>>/bitstring>>, <<5:3>>),
     ?T(<<42,<<7:4>>/binary-unit:4>>, <<42,7:4>>),
     ?T(<<<<344:17>>/binary-unit:17>>, <<344:17>>),
     ?T(<<<<42,3,7656:16>>/binary-unit:16>>, <<42,3,7656:16>>)

     ].

native_3798() ->
    case <<1:16/native>> of
	<<0,1>> -> [64,66,253,112,163,215,10,61];
	<<1,0>> -> [61,10,215,163,112,253,66,64]
    end.

native_bignum() ->
    case <<1:16/native>> of
	<<0,1>> -> [129,205,18,177,1,213,170,101,39,231,109,128,176,11,73,217];
	<<1,0>> -> [217,73,11,176,128,109,231,39,101,170,213,1,177,18,205,129]
    end.

evaluate(Str, Vars) ->
    {ok,Tokens,_} =
	erl_scan:string(Str ++ " . "),
    {ok, [Expr]} = erl_parse:parse_exprs(Tokens),
    case erl_eval:expr(Expr, Vars) of
	{value, Result, _} ->
	    Result
    end.

eval_list([], _Vars) ->
    [];
eval_list([{C_bin, Str, Bytes} | Rest], Vars) ->
    case catch evaluate(Str, Vars) of
	{'EXIT', Error} ->
	    io:format("Evaluation error: ~p, ~p, ~p~n", [Str, Vars, Error]),
	    exit(Error);
	E_bin ->
	    [{C_bin, E_bin, Str, Bytes} | eval_list(Rest, Vars)]
    end.

one_test({C_bin, E_bin, Str, Bytes}) when is_list(Bytes) ->
    io:format("  ~s, ~p~n", [Str, Bytes]),
    Bin = list_to_binary(Bytes),
    if
	C_bin == Bin ->
	    ok;
	true ->
	    io:format("ERROR: Compiled: ~p. Expected ~p. Got ~p.~n",
		      [Str, Bytes, binary_to_list(C_bin)]),
	    test_server:fail(comp)
    end,
    if
	E_bin == Bin ->
	    ok;
	true ->
	    io:format("ERROR: Interpreted: ~p. Expected ~p. Got ~p.~n",
		      [Str, Bytes, binary_to_list(E_bin)]),
	    test_server:fail(comp)
    end;
one_test({C_bin, E_bin, Str, Result}) ->
    io:format("  ~s ~p~n", [Str, C_bin]),
    if
	C_bin == E_bin ->
	    ok;
	true ->
	    Arbitrary = case Result of
			    unknown ->
				size(C_bin);
			    _ ->
				Result
			end,
	    case equal_lists(binary_to_list(C_bin),
			     binary_to_list(E_bin),
			     Arbitrary) of
		false ->
		    io:format("ERROR: Compiled not equal to interpreted:"
			      "~n ~p, ~p.~n",
			      [binary_to_list(C_bin), binary_to_list(E_bin)]),
		    test_server:fail(comp);
		0 ->
		    ok;
		%% For situations where the final bits may not matter, like
		%% for floats:
		N when is_integer(N) ->
		    io:format("Info: compiled and interpreted differ in the"
			      " last bytes:~n ~p, ~p.~n",
			      [binary_to_list(C_bin), binary_to_list(E_bin)]),
		    ok
	    end
    end.

equal_lists([], [], _) ->
    0;
equal_lists([], _, _) ->
    false;
equal_lists(_, [], _) ->
    false;
equal_lists([A|AR], [A|BR], R) ->
    equal_lists(AR, BR, R);
equal_lists(A, B, R) ->
    if
	length(A) /= length(B) ->
	    false;
	length(A) =< R ->
	    R;
	true ->
	    false
    end.

fail_check({'EXIT',{badarg,_}}, Str, Vars) ->
    try	evaluate(Str, Vars) of
	Res ->
	    io:format("Interpreted result: ~p", [Res]),
	    ?t:fail(did_not_fail_in_intepreted_code)
    catch
	error:badarg ->
	    ok
    end;
fail_check(Res, _, _) ->
    io:format("Compiled result: ~p", [Res]),
    ?t:fail(did_not_fail_in_compiled_code).

%%% Simple working cases
test1(suite) -> [];
test1(Config) when is_list(Config) ->
    ?line I_13 = i(13),
    ?line I_big1 = big(1),
    ?line Vars = [{'I_13', I_13},
		  {'I_big1', I_big1}],
    ?line lists:foreach(fun one_test/1, eval_list(l(I_13, I_big1), Vars)).

%%% Misc

%%% <<A:S, A:(N-S)>>
comp(N, A, S) ->
    M1 = (1 bsl S) - 1,
    M2 = (1 bsl (N-S)) - 1,
    [((A band M1) bsl (N-S)) bor (A band M2)].

gen(N, S, A) ->
    [?T(<<A:S, A:(N-S)>>, comp(N, A, S))].

gen_l(N, S, A) ->
    [?T(<<A:S/little, A:(N-S)/little>>, comp(N, A, S))].

test2(suite) -> [];
test2(Config) when is_list(Config) ->
    ?line test2(0, 8, 2#10101010101010101),
    ?line test2(0, 8, 2#1111111111).

test2(End, End, _) ->
    ok;
test2(I, End, A) ->
    test2(I, A),
    test2(I+1, End, A).

test2(S, A) ->
    N = 8,
    Vars = [{'A',A}, {'N',N}, {'S',S}],
    io:format("Vars: ~p\n", [Vars]),
    lists:foreach(fun one_test/1, eval_list(gen(N, S, A), Vars)),
    lists:foreach(fun one_test/1, eval_list(gen_l(N, S, A), Vars)).

%%% Tests without facit

t3() ->
    [?N(<<4711:13, 9876:13, 3:6>>),
     ?N(<<4.57:64/float>>),
     ?N(<<4.57:32/float>>),

     ?N(<<>>)
    ].

test3(suite) -> [];
test3(Config) when is_list(Config) ->
    ?line Vars = [],
    ?line lists:foreach(fun one_test/1, eval_list(t3(), Vars)).

gen_u(N, S, A) ->
    [?N(<<A:S, A:(N-S)>>)].

gen_u_l(N, S, A) ->
    [?N(<<A:S/little, A:(N-S)/little>>)].

test4(suite) -> [];
test4(Config) when is_list(Config) ->
    ?line test4(0, 16, 2#10101010101010101),
    ?line test4(0, 16, 2#1111111111).

test4(End, End, _) ->
    ok;
test4(I, End, A) ->
    test4(I, A),
    test4(I+1, End, A).

test4(S, A) ->
    N = 16,
    Vars = [{'A', A}, {'N', 16}, {'S', S}],
    lists:foreach(fun one_test/1, eval_list(gen_u(N, S, A), Vars)),
    lists:foreach(fun one_test/1, eval_list(gen_u_l(N, S, A), Vars)).

gen_b(N, S, A) ->
    [?T(<<A:S/binary-unit:1, A:(N-S)/binary-unit:1>>,
	binary_to_list(<<A:S/binary-unit:1, A:(N-S)/binary-unit:1>>))].

test5(suite) -> [];
test5(doc) -> ["OTP-3995"];
test5(Config) when is_list(Config) ->
    ?line test5(0, 8, <<73>>),
    ?line test5(0, 8, <<68>>).

test5(End, End, _) ->
    ok;
test5(I, End, A) ->
    test5(I, A),
    test5(I+1, End, A).

test5(S, A) ->
    N = 8,
    Vars = [{'A', A}, {'N', 8}, {'S', S}],
    lists:foreach(fun one_test/1, eval_list(gen_b(N, S, A), Vars)).

%%% Failure cases
testf(suite) -> [];
testf(Config) when is_list(Config) ->
    ?line ?FAIL(<<3.14>>),
    ?line ?FAIL(<<<<1,2>>>>),

    ?line ?FAIL(<<2.71/binary>>),
    ?line ?FAIL(<<24334/binary>>),
    ?line ?FAIL(<<24334344294788947129487129487219847/binary>>),
    BigInt = id(24334344294788947129487129487219847),
    ?line ?FAIL_VARS(<<BigInt/binary>>, [{'BigInt',BigInt}]),
    ?line ?FAIL_VARS(<<42,BigInt/binary>>, [{'BigInt',BigInt}]),
    ?line ?FAIL_VARS(<<BigInt:2/binary>>, [{'BigInt',BigInt}]),

    %% One negative field size, but the sum of field sizes will be 1 byte.
    %% Make sure that we reject that properly.
    I_minus_777 = id(-777),
    I_minus_2047 = id(-2047),
    ?line ?FAIL_VARS(<<I_minus_777:2048/unit:8,57:I_minus_2047/unit:8>>,
		     ordsets:from_list([{'I_minus_777',I_minus_777},
					{'I_minus_2047',I_minus_2047}])),
    ?line ?FAIL(<<<<1,2,3>>/float>>),

    %% Negative field widths.
    ?line testf_1(-8, <<1,2,3,4,5>>),
    ?line ?FAIL(<<0:(-(1 bsl 100))>>),

    ?line ?FAIL(<<42:(-16)>>),
    ?line ?FAIL(<<3.14:(-8)/float>>),
    ?line ?FAIL(<<<<23,56,0,2>>:(-16)/binary>>),
    ?line ?FAIL(<<<<23,56,0,2>>:(2.5)/binary>>),
    ?line ?FAIL(<<<<23,56,0,2>>:(anka)>>),
    ?line ?FAIL(<<<<23,56,0,2>>:(anka)>>),

    %% Unit failures.
    ?line ?FAIL(<<<<1:1>>/binary>>),
    Sz = id(1),
    ?line ?FAIL_VARS(<<<<1:Sz>>/binary>>, [{'Sz',Sz}]),
    ?line {'EXIT',{badarg,_}} = (catch <<<<1:(id(1))>>/binary>>),
    ?line ?FAIL(<<<<7,8,9>>/binary-unit:16>>),
    ?line ?FAIL(<<<<7,8,9,3:7>>/binary-unit:16>>),
    ?line ?FAIL(<<<<7,8,9,3:7>>/binary-unit:17>>),

    ok.

testf_1(W, B) ->
    Vars = [{'W',W}],
    ?FAIL_VARS(<<42:W>>, Vars),
    ?FAIL_VARS(<<3.14:W/float>>, Vars),
    ?FAIL_VARS(<<B:W/binary>>, [{'B',B}|Vars]).

not_used(doc) ->
    "Test that constructed binaries that are not used will still give an exception.";
not_used(Config) when is_list(Config) ->
    ?line ok = not_used1(3, <<"dum">>),
    ?line {'EXIT',{badarg,_}} = (catch not_used1(3, "dum")),
    ?line {'EXIT',{badarg,_}} = (catch not_used2(444, -2)),
    ?line {'EXIT',{badarg,_}} = (catch not_used2(444, anka)),
    ?line {'EXIT',{badarg,_}} = (catch not_used3(444)),
    ok.

not_used1(I, BinString) ->
    <<I:32,BinString/binary>>,
    ok.

not_used2(I, Sz) ->
    <<I:Sz>>,
    ok.

not_used3(I) ->
    <<I:(-8)>>,
    ok.

in_guard(Config) when is_list(Config) ->
    ?line 1 = in_guard(<<16#74ad:16>>, 16#e95, 5),
    ?line 2 = in_guard(<<16#3A,16#F7,"hello">>, 16#3AF7, <<"hello">>),
    ?line 3 = in_guard(<<16#FBCD:14,3.1415/float,3:2>>, 16#FBCD, 3.1415),
    nope = in_guard(<<1>>, 42, b),
    nope = in_guard(<<1>>, a, b),
    nope = in_guard(<<1,2>>, 1, 1),
    nope = in_guard(<<4,5>>, 1, 2.71),
    nope = in_guard(<<4,5>>, 1, <<12,13>>),
    ok.

in_guard(Bin, A, B) when <<A:13,B:3>> == Bin -> 1;
in_guard(Bin, A, B) when <<A:16,B/binary>> == Bin -> 2;
in_guard(Bin, A, B) when <<A:14,B/float,3:2>> == Bin -> 3;
in_guard(Bin, A, B) when {a,b,<<A:14,B/float,3:2>>} == Bin -> cant_happen;
in_guard(_, _, _) -> nope.

mem_leak(doc) -> "Make sure that construction has no memory leak";
mem_leak(Config) when is_list(Config) ->
    ?line B = make_bin(16, <<0>>),
    ?line mem_leak(1024, B),
    ok.

mem_leak(0, _) -> ok;
mem_leak(N, B) ->
    ?line big_bin(B, <<23>>),
    ?line {'EXIT',{badarg,_}} = (catch big_bin(B, bad)),
    maybe_gc(),
    mem_leak(N-1, B).

big_bin(B1, B2) ->
    <<B1/binary,B1/binary,B1/binary,B1/binary,
      B1/binary,B1/binary,B1/binary,B1/binary,
      B1/binary,B1/binary,B1/binary,B1/binary,
      B1/binary,B1/binary,B1/binary,B1/binary,
      B2/binary>>.
    
make_bin(0, Acc) -> Acc;
make_bin(N, Acc) -> make_bin(N-1, <<Acc/binary,Acc/binary>>).

maybe_gc() ->
    case erlang:system_info(heap_type) of
	shared -> erlang:garbage_collect();
	hybrid -> erlang:garbage_collect();
	private -> ok
    end.

-define(COF(Int0),
	?line (fun(Int) ->
		       true = <<Int:32/float>> =:= <<(float(Int)):32/float>>,
		       true = <<Int:64/float>> =:= <<(float(Int)):64/float>>
			   end)(nonliteral(Int0)),
 	?line true = <<Int0:32/float>> =:= <<(float(Int0)):32/float>>,
 	?line true = <<Int0:64/float>> =:= <<(float(Int0)):64/float>>).

-define(COF64(Int0),
	?line (fun(Int) ->
		       true = <<Int:64/float>> =:= <<(float(Int)):64/float>>
			   end)(nonliteral(Int0)),
 	?line true = <<Int0:64/float>> =:= <<(float(Int0)):64/float>>).

nonliteral(X) -> X.
    
coerce_to_float(Config) when is_list(Config) ->
    ?COF(0),
    ?COF(-1),
    ?COF(1),
    ?COF(42),
    ?COF(255),
    ?COF(-255),
    ?COF(38474),
    ?COF(387498738948729893849444444443),
    ?COF(-37489378937773899999999999999993),
    ?COF64(298748888888888888888888888883478264866528467367364766666666666666663),
    ?COF64(-367546729879999999999947826486652846736736476555566666663),
    ok.

bjorn(Config) when is_list(Config) ->
    ?line error = bjorn_1(),
    ok.

bjorn_1() ->
    Bitstr = <<7:13>>,
    try
	do_something()
    catch
	throw:blurf ->
	    ignore
    end,
    do_more(Bitstr, 13).

do_more(Bin, Sz) ->
    %% Previous bug in the bs_bits_to_bytes instruction: The exeption code
    %% was not set - the previous exception (throw:blurf) would be used,
    %% causing the catch to slip.
    try <<Bin:Sz/binary>> of
	_V -> ok
    catch
	error:_ ->
	    error
    end.

do_something() ->
    throw(blurf).

huge_float_field(Config) when is_list(Config) ->
    ?line {'EXIT',{badarg,_}} = (catch <<0.0:9/float-unit:8>>),
    ?line huge_float_check(catch <<0.0:67108865/float-unit:64>>),
    ?line huge_float_check(catch <<0.0:((1 bsl 26)+1)/float-unit:64>>),
    ?line huge_float_check(catch <<0.0:(id(67108865))/float-unit:64>>),
%%  ?line huge_float_check(catch <<0.0:((1 bsl 60)+1)/float-unit:64>>),
    ?line huge_float_check(catch <<3839739387439387383739387987347983:((1 bsl 26)+1)/float-unit:64>>),
%%  ?line huge_float_check(catch <<3839739387439387383739387987347983:((1 bsl 60)+1)/float-unit:64>>),
    ok.

huge_float_check({'EXIT',{system_limit,_}}) -> ok;
huge_float_check({'EXIT',{badarg,_}}) -> ok.

huge_binary(Config) when is_list(Config) ->
    ?line 16777216 = size(<<0:(id(1 bsl 26)),(-1):(id(1 bsl 26))>>),
    ?line garbage_collect(),
    ?line id(<<0:((1 bsl 32)-1)>>),
    ?line garbage_collect(),
    ?line id(<<0:(id((1 bsl 32)-1))>>),
    ?line garbage_collect(),
    ok.

system_limit(Config) when is_list(Config) ->
    WordSize = erlang:system_info(wordsize),
    BitsPerWord = WordSize * 8,
    ?line {'EXIT',{system_limit,_}} =
	(catch <<0:(id(0)),42:(id(1 bsl BitsPerWord))>>),
    ?line {'EXIT',{system_limit,_}} =
	(catch <<42:(id(1 bsl BitsPerWord)),0:(id(0))>>),
    ?line {'EXIT',{system_limit,_}} =
	(catch <<(id(<<>>))/binary,0:(id(1 bsl 100))>>),

    %% Would fail to load.
    ?line {'EXIT',{system_limit,_}} = (catch <<0:(1 bsl 67)>>),
    ?line {'EXIT',{system_limit,_}} = (catch <<0:((1 bsl 64)+1)>>),

    case WordSize of
	4 ->
	    system_limit_32();
	8 ->
	    ok
    end.

system_limit_32() ->
    ?line {'EXIT',{badarg,_}} = (catch <<42:(-1)>>),
    ?line {'EXIT',{badarg,_}} = (catch <<42:(id(-1))>>),
    ?line {'EXIT',{badarg,_}} = (catch <<42:(id(-389739873536870912))/unit:8>>),
    ?line {'EXIT',{system_limit,_}} = (catch <<42:536870912/unit:8>>),
    ?line {'EXIT',{system_limit,_}} = (catch <<42:(id(536870912))/unit:8>>),
    ?line {'EXIT',{system_limit,_}} = (catch <<0:(id(8)),42:536870912/unit:8>>),
    ?line {'EXIT',{system_limit,_}} =
	(catch <<0:(id(8)),42:(id(536870912))/unit:8>>),

    %% The size would be silently truncated, resulting in a crash.
    ?line {'EXIT',{system_limit,_}} = (catch <<0:(1 bsl 35)>>),
    ?line {'EXIT',{system_limit,_}} = (catch <<0:((1 bsl 32)+1)>>),

    %% Would fail to load.
    ?line {'EXIT',{system_limit,_}} = (catch <<0:(1 bsl 43)>>),
    ?line {'EXIT',{system_limit,_}} = (catch <<0:((1 bsl 40)+1)>>),
    ok.

badarg(Config) when is_list(Config) ->
    ?line {'EXIT',{badarg,_}} =
	(catch <<0:(id(1 bsl 100)),0:(id(-1))>>),
    ?line {'EXIT',{badarg,_}} =
	(catch <<0:(id(1 bsl 100)),0:(id(-(1 bsl 70)))>>),
    ?line {'EXIT',{badarg,_}} =
	(catch <<0:(id(-(1 bsl 70))),0:(id(1 bsl 100))>>),

    ?line {'EXIT',{badarg,_}} =
	(catch <<(id(<<>>))/binary,0:(id(-(1 bsl 100)))>>),

    ok.

copy_writable_binary(Config) when is_list(Config) ->
    ?line [copy_writable_binary_1(I) || I <- lists:seq(0, 256)],
    ok.

copy_writable_binary_1(_) ->
    ?line Bin0 = <<(id(<<>>))/binary,0,1,2,3,4,5,6,7>>,
    ?line SubBin = make_sub_bin(Bin0),
    ?line id(<<42,34,55,Bin0/binary>>),		%Make reallocation likelier.
    ?line Pid = spawn(fun() ->
			      copy_writable_binary_holder(Bin0, SubBin)
		      end),
    ?line Tab = ets:new(holder, []),
    ?line ets:insert(Tab, {17,Bin0}),
    ?line ets:insert(Tab, {42,SubBin}),
    ?line id(<<Bin0/binary,0:(64*1024*8)>>),
    ?line Pid ! self(),
    ?line [{17,Bin0}] = ets:lookup(Tab, 17),
    ?line [{42,Bin0}] = ets:lookup(Tab, 42),
    receive
	{Pid,Bin0,Bin0} -> ok;
	Other ->
	    io:format("Unexpected message: ~p", [Other]),
	    ?line ?t:fail()
    end,
    ok.

copy_writable_binary_holder(Bin, SubBin) ->
    receive
	Pid ->
	    Pid ! {self(),Bin,SubBin}
    end.

make_sub_bin(Bin0) ->
    N = bit_size(Bin0),
    <<_:17,Bin:N/bitstring,_:5>> = <<(-1):17,Bin0/bitstring,(-1):5>>,
    Bin = Bin0,					%Assertion.
    Bin.

%% Make sure that bit syntax expression with huge field size are
%% not constructed at compile time.

kostis(Config) when is_list(Config) ->
    case have_250_terabytes_of_ram() of
	true ->
	    Bin = <<0:800000000000>>,
	    EmbeddedBin = <<0,(<<0:99999999999>>)/bitstring,1>>,
	    Bin0 = list_to_binary([Bin,Bin,Bin,Bin,Bin]),
	    Bin1 = list_to_binary([Bin0,Bin0,Bin0,Bin0,Bin0,Bin0]),
	    Bin2 = list_to_binary([Bin1,Bin1]),
	    id({EmbeddedBin,Bin0,Bin1,Bin2});
	false ->
	    ok
    end.

%% I'm not even certain how much 250 TB really is...
%% but I'm sure I don't have it :-)

have_250_terabytes_of_ram() -> false.

%% Test that different ways of using bit syntax instructions
%% give the same result.

dynamic(Config) when is_list(Config) ->
    ?line dynamic_1(fun dynamic_big/5),
    ?line dynamic_1(fun dynamic_little/5),
    ok.
		      
dynamic_1(Dynamic) ->
    <<Lpad:128>> = erlang:md5([0]),
    <<Rpad:128>> = erlang:md5([1]),
    <<Int:128>> = erlang:md5([2]),
    8385 = dynamic_2(0, {Int,Lpad,Rpad,Dynamic}, 0).

dynamic_2(129, _, Count) -> Count;
dynamic_2(Bef, Data, Count0) ->
    Count = dynamic_3(Bef, 128-Bef, Data, Count0),
    dynamic_2(Bef+1, Data, Count).

dynamic_3(_, -1, _, Count) -> Count;
dynamic_3(Bef, N, {Int0,Lpad,Rpad,Dynamic}=Data, Count) ->
    Int1 = Int0 band ((1 bsl (N+3))-1),
    Dynamic(Bef, N, Int1, Lpad, Rpad),
    Dynamic(Bef, N, -Int1, Lpad, Rpad),

    %% OTP-7085: Test a small number in a wide field.
    Int2 = Int0 band 16#FFFFFF,
    Dynamic(Bef, N, Int2, Lpad, Rpad),
    Dynamic(Bef, N, -Int2, Lpad, Rpad),
    dynamic_3(Bef, N-1, Data, Count+1).

dynamic_big(Bef, N, Int, Lpad, Rpad) ->
    NumBin = id(<<Int:N>>),
    MaskedInt = Int band ((1 bsl N) - 1),
    <<MaskedInt:N>> = NumBin,

    %% Construct the binary in two different ways.
    Bin = id(<<Lpad:Bef,NumBin/bitstring,Rpad:(128-Bef-N)>>),
    Bin = <<Lpad:Bef,Int:N,Rpad:(128-Bef-N)>>,

    %% Further verify the result by matching.
    LpadMasked = Lpad band ((1 bsl Bef) - 1),
    RpadMasked = Rpad band ((1 bsl (128-Bef-N)) - 1),
    Rbits = (128-Bef-N),
    <<LpadMasked:Bef,MaskedInt:N,RpadMasked:Rbits>> = id(Bin),
    ok.

dynamic_little(Bef, N, Int, Lpad, Rpad) ->
    NumBin = id(<<Int:N/little>>),
    MaskedInt = Int band ((1 bsl N) - 1),
    <<MaskedInt:N/little>> = NumBin,

    %% Construct the binary in two different ways.
    Bin = id(<<Lpad:Bef/little,NumBin/bitstring,Rpad:(128-Bef-N)/little>>),
    Bin = <<Lpad:Bef/little,Int:N/little,Rpad:(128-Bef-N)/little>>,

    %% Further verify the result by matching.
    LpadMasked = Lpad band ((1 bsl Bef) - 1),
    RpadMasked = Rpad band ((1 bsl (128-Bef-N)) - 1),
    Rbits = (128-Bef-N),
    <<LpadMasked:Bef/little,MaskedInt:N/little,RpadMasked:Rbits/little>> = id(Bin),
    ok.

%% Test that the bs_add/5 instruction handles big numbers correctly.
bs_add(Config) when is_list(Config) ->
    Mod = bs_construct_bs_add,
    N = 2000,
    Code = [{module, Mod},
	    {exports, [{bs_add,2}]},
	    {labels, 2},

	    %% bs_add(Number, -SmallestBig) -> Number + N
	    {function, bs_add, 2, 2},
	    {label,1},
	    {func_info,{atom,Mod},{atom,bs_add},2},

	    {label,2},
	    {move,{x,0},{x,2}}] ++
	lists:duplicate(N-1, {bs_add,{f,0},[{x,2},{integer,1},1],{x,2}}) ++
	[{gc_bif,abs,{f,0},3,[{x,1}],{x,4}},	%Force GC, ignore result.
	 {gc_bif,'+',{f,0},3,[{x,2},{integer,1}],{x,0}}, %Safe result in {x,0}
	 return],

    %% Write assembly file and assemble it.
    ?line PrivDir = ?config(priv_dir, Config),
    ?line RootName = filename:join(PrivDir, atom_to_list(Mod)),
    ?line AsmFile = RootName ++ ".S",
    ?line {ok,Fd} = file:open(AsmFile, [write]),
    ?line [io:format(Fd, "~p. \n", [T]) || T <- Code],
    ?line ok = file:close(Fd),
    ?line {ok,Mod} = compile:file(AsmFile, [from_asm,report,{outdir,PrivDir}]),
    ?line LoadRc = code:load_abs(RootName),
    ?line {module,_Module} = LoadRc,

    %% Find smallest positive bignum.
    ?line SmallestBig = smallest_big(),
    ?line io:format("~p\n", [SmallestBig]),
    ?line Expected = SmallestBig + N,
    DoTest = fun() ->
		     exit(Mod:bs_add(SmallestBig, -SmallestBig))
	     end,
    ?line {Pid,Mref} = spawn_monitor(DoTest),
    receive
	{'DOWN',Mref,process,Pid,Res} -> ok
    end,
    ?line Expected = Res,

    %% Clean up.
    ?line ok = file:delete(AsmFile),
    ?line ok = file:delete(code:which(Mod)),
    ok.

     
smallest_big() ->
    smallest_big_1(1 bsl 24).

smallest_big_1(N) ->
    case erts_debug:flat_size(N) of
	0 -> smallest_big_1(N+N);
	_  -> N
    end.

otp_7422(Config) when is_list(Config) ->
    otp_7422_int(0),
    otp_7422_bin(0).

otp_7422_int(N) when N < 512 ->
    T = erlang:make_tuple(N, []),
    spawn_link(fun() ->
		       id(T),
		       %% A size of field 0 would write one byte beyond
		       %% the current position in the binary. It could
		       %% overwrite the continuation pointer stored on
		       %% the stack if HTOP was equal to E (the stack pointer).
		       id(<<0:(id(0))>>)
	       end),
    otp_7422_int(N+1);
otp_7422_int(_) -> ok.

otp_7422_bin(N) when N < 512 ->
    T = erlang:make_tuple(N, []),
    Z = id(<<>>),
    spawn_link(fun() ->
		       id(T),
		       id(<<Z:(id(0))/bits>>)
	       end),
    otp_7422_bin(N+1);
otp_7422_bin(_) -> ok.

zero_width(Config) when is_list(Config) ->
    ?line Z = id(0),
    Small = id(42),
    Big = id(1 bsl 128),
    ?line <<>> = <<Small:Z>>,
    ?line <<>> = <<Small:0>>,
    ?line <<>> = <<Big:Z>>,
    ?line <<>> = <<Big:0>>,
    
    ?line {'EXIT',{badarg,_}} = (catch <<not_a_number:0>>),
    ?line {'EXIT',{badarg,_}} = (catch <<(id(not_a_number)):Z>>),
    ?line {'EXIT',{badarg,_}} = (catch <<(id(not_a_number)):0>>),

    ok.
    
id(I) -> I.