%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2015-2018. 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(beam_block_SUITE).
-export([all/0,suite/0,groups/0,init_per_suite/1,end_per_suite/1,
init_per_group/2,end_per_group/2,
get_map_elements/1,otp_7345/1,move_opt_across_gc_bif/1,
erl_202/1,repro/1,local_cse/1,second_block_pass/1]).
%% The only test for the following functions is that
%% the code compiles and is accepted by beam_validator.
-export([encode_wildcards3/4,find_operands/4]).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[{group,p}].
groups() ->
[{p,[parallel],
[get_map_elements,
otp_7345,
move_opt_across_gc_bif,
erl_202,
repro,
local_cse,
second_block_pass
]}].
init_per_suite(Config) ->
test_lib:recompile(?MODULE),
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
get_map_elements(_Config) ->
[{pred,var}] = get_map_elements([{pred,var}], #{}, []),
[{pred,var}] = get_map_elements([{pred,var}], #{pred=>[]}, []),
acc = get_map_elements([], #{pred=>[]}, acc),
ok.
get_map_elements([{Pred,Var}|Left], Map, Acc) ->
case Map of
#{Var := List} ->
case lists:keyfind(Pred, 1, List) of
false ->
get_map_elements(Left, Map, [{Pred,Var}|Acc])
end;
#{} ->
get_map_elements(Left, Map, [{Pred,Var}|Acc])
end;
get_map_elements([], _Map, Acc) ->
Acc.
%% The following code
%%
%% {get_list,{x,2},{x,0},{x,1}}.
%% {gc_bif,length,{f,0},1,[{x,0}],{x,0}}.
%% {move,{x,0},{x,1}}.
%%
%% was incorrectly optimized to
%%
%% {get_list,{x,2},{x,0},{y,0}}.
%% {gc_bif,length,{f,0},3,[{x,0}],{x,1}}.
%%
%% because beam_block:is_transparent({x,1},
%% {gc_bif,length,{f,0},3,[{x,0}],{x,1}}
%% incorrectly returned true.
-record(contextId,{cid,device_type,contextRef}).
-record(dpRef,{cid,tlli,ms_device_context_id}).
-record(qosProfileBssgp,{peak_bit_rate_msb,
peak_bit_rate_lsb,
t_a_precedence}).
-record(llUnitdataReq,{sapi,
l3_pdu_length,
pdu_life}).
-record(ptmsi,{value}).
otp_7345(_Config) ->
#llUnitdataReq{l3_pdu_length=3,pdu_life=4} =
otp_7345(#contextId{}, 0, [[1,2,3],4,5]).
otp_7345(ObjRef, _RdEnv, Args) ->
Cid = ObjRef#contextId.cid,
_ = #dpRef{cid = Cid,
ms_device_context_id = cid_id,
tlli = #ptmsi{value = 0}},
_ = #qosProfileBssgp{peak_bit_rate_msb = 0,
peak_bit_rate_lsb = 80,
t_a_precedence = 49},
[Cpdu|_] = Args,
LlUnitdataReq =
#llUnitdataReq{sapi = 7,
l3_pdu_length = length(Cpdu),
pdu_life =
id(42)
div
10},
id(LlUnitdataReq).
%% Doing move optimizations across GC bifs are in general not safe.
move_opt_across_gc_bif(_Config) ->
[0,true,1] = positive(speaking),
ok.
positive(speaking) ->
try
Positive = 0,
[+Positive, case Positive of _ -> true end, paris([], Positive)]
after
mailing
end.
paris([], P) -> P + 1.
%% See https://bugs.erlang.org/browse/ERL-202.
%% Test that move_allocates/1 in beam_block doesn't move allocate
%% when it would not be safe.
-record(erl_202_r1, {y}).
-record(erl_202_r2, {x}).
erl_202(_Config) ->
Ref = make_ref(),
Ref = erl_202({{1,2},Ref}, 42),
{Ref} = erl_202({7,8}, #erl_202_r1{y=#erl_202_r2{x=Ref}}),
ok.
erl_202({{_, _},X}, _) ->
X;
erl_202({_, _}, #erl_202_r1{y=R2}) ->
{R2#erl_202_r2.x}.
%% See https://bugs.erlang.org/browse/ERL-266.
%% Instructions with failure labels are not safe to include
%% in a block. Including get_map_elements in a block would
%% lead to unsafe code.
repro(_Config) ->
[] = maps:to_list(repro([], #{}, #{})),
[{tmp1,n}] = maps:to_list(repro([{tmp1,0}], #{}, #{})),
[{tmp1,name}] = maps:to_list(repro([{tmp1,0}], #{}, #{0=>name})),
ok.
repro([], TempNames, _Slots) ->
TempNames;
repro([{Temp, Slot}|Xs], TempNames, Slots0) ->
{Name, Slots} =
case Slots0 of
#{Slot := Name0} -> {Name0, Slots0};
#{} -> {n, Slots0#{Slot => n}}
end,
repro(Xs, TempNames#{Temp => Name}, Slots).
%%%
%%% The only test of the following code is that it compiles.
%%%
%% Slightly simplifed from megaco_binary_term_id_gen.
%% beam_block failed to note that the {gc_bif,'-'...} instruction could
%% fail, and that therefore {y,0} need to be initialized.
%% {allocate,8,6}.
%% %% {init,{y,0}} needed here.
%% {get_list,{x,1},{x,6},{x,7}}.
%% {'catch',{y,7},{f,3}}.
%% {move,{x,4},{y,1}}.
%% {move,{x,3},{y,2}}.
%% {move,{x,2},{y,3}}.
%% {move,{x,5},{y,4}}.
%% {move,{x,7},{y,5}}.
%% {move,{x,6},{y,6}}.
%% {gc_bif,'-',{f,0},8,[{x,3},{x,6}],{x,0}}.
%% {move,{x,0},{y,0}}.
encode_wildcards3([],[],_,_) -> [];
encode_wildcards3([Level|Levels],[BitsInLevel|BitsRest],LevelNo,TotSize) ->
case (catch ?MODULE:encode_wildcard(Level,BitsInLevel,TotSize-BitsInLevel,
length(Levels))) of
{'EXIT',{Reason,Info}} ->
exit({Reason,{LevelNo,Info}});
no_wildcard ->
encode_wildcards3(Levels,BitsRest,LevelNo+1,TotSize-BitsInLevel);
{level,Wl} ->
[Wl|
encode_wildcards3(Levels,BitsRest,LevelNo+1,TotSize-BitsInLevel)];
{recursive,Wr} ->
[Wr]
end.
%% Slightly simplified code from hipe_rtl_ssapre.
%% beam_block used to do the following incorrect optimization:
%%
%% {gc_bif,length,{f,0},1,[{x,0}],{x,3}}.
%% ^^^^^ Was {x,0} - changing to {x,3} is not safe.
%% {gc_bif,'+',{f,0},0,[{y,2},{integer,1}],{x,0}}.
%% ^^^ Only one register live
%% . . .
%% {call_last,4,{f,2},4}. %% beam_validator noted that {x,3} wasn't live.
find_operands(Cfg,XsiGraph,[],_Count) ->
{Cfg,XsiGraph};
find_operands(Cfg,XsiGraph,ActiveList,Count) ->
{NewCfg,TempActiveList}=?MODULE:find_operands_for_active_list(Cfg,XsiGraph,
ActiveList,[]),
NewActiveList=lists:reverse(TempActiveList),
[Count+1, length(NewActiveList), length(digraph:vertices(XsiGraph))],
find_operands(NewCfg,XsiGraph,NewActiveList,Count+1).
%% Some tests of local common subexpression elimination (CSE).
local_cse(_Config) ->
{Self,{ok,Self}} = local_cse_1(),
local_cse_2([]),
local_cse_2(lists:seq(1, 512)),
local_cse_2(?MODULE:module_info()),
{[b],[a,b]} = local_cse_3(a, b),
{2000,Self,{Self,write_cache}} = local_cse_4(),
ok.
local_cse_1() ->
%% Cover handling of unsafe tuple construction in
%% eliminate_use_of_from_reg/4. It became necessary to handle
%% unsafe tuples when local CSE was introduced.
{self(),{ok,self()}}.
local_cse_2(Term) ->
case cse_make_binary(Term) of
<<Size:8,BinTerm:Size/binary>> ->
Term = binary_to_term(BinTerm);
<<Size:8,SizeTerm:Size/binary,BinTerm/binary>> ->
{'$size',TermSize} = binary_to_term(SizeTerm),
TermSize = byte_size(BinTerm),
Term = binary_to_term(BinTerm)
end.
%% Copy of observer_backend:ttb_make_binary/1. During development of
%% the local CSE optimization this function was incorrectly optimized.
cse_make_binary(Term) ->
B = term_to_binary(Term),
SizeB = byte_size(B),
if SizeB > 255 ->
SB = term_to_binary({'$size',SizeB}),
<<(byte_size(SB)):8, SB/binary, B/binary>>;
true ->
<<SizeB:8, B/binary>>
end.
local_cse_3(X, Y) ->
%% The following expression was incorrectly transformed to {[X,Y],[X,Y]}
%% during development of the local CSE optimization.
{[Y],[X,Y]}.
local_cse_4() ->
do_local_cse_4(2000, self(), {self(), write_cache}).
do_local_cse_4(X, Y, Z) ->
{X,Y,Z}.
%% Tests previously found bugs when running beam_block the second time.
second_block_pass(_Config) ->
[#{dts:=5.0}] = second_1([#{dts => 10.0}], 2.0),
ok.
second_1(Fs, TS) ->
[F#{dts=>DTS / TS} || #{dts:=DTS} = F <- Fs].
%%%
%%% Common functions.
%%%
id(I) -> I.
