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-rw-r--r--lib/compiler/src/core_lint.erl22
-rw-r--r--lib/compiler/src/v3_core.erl78
-rw-r--r--lib/compiler/test/bs_bincomp_SUITE.erl38
3 files changed, 102 insertions, 36 deletions
diff --git a/lib/compiler/src/core_lint.erl b/lib/compiler/src/core_lint.erl
index b633f568c9..097577b371 100644
--- a/lib/compiler/src/core_lint.erl
+++ b/lib/compiler/src/core_lint.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1999-2009. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2010. 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
@@ -116,7 +116,9 @@ format_error({duplicate_var,N,{F,A}}) ->
format_error({unbound_var,N,{F,A}}) ->
io_lib:format("unbound variable ~s in ~w/~w", [N,F,A]);
format_error({undefined_function,{F1,A1},{F2,A2}}) ->
- io_lib:format("undefined function ~w/~w in ~w/~w", [F1,A1,F2,A2]).
+ io_lib:format("undefined function ~w/~w in ~w/~w", [F1,A1,F2,A2]);
+format_error({tail_segment_not_at_end,{F,A}}) ->
+ io_lib:format("binary tail segment not at end in ~w/~w", [F,A]).
-type ret() :: {'ok', [{module(), [warning(),...]}]}
| {'error', [{module(), [error(),...]}],
@@ -450,7 +452,8 @@ pattern(#c_cons{hd=H,tl=T}, Def, Ps, St) ->
pattern_list([H,T], Def, Ps, St);
pattern(#c_tuple{es=Es}, Def, Ps, St) ->
pattern_list(Es, Def, Ps, St);
-pattern(#c_binary{segments=Ss}, Def, Ps, St) ->
+pattern(#c_binary{segments=Ss}, Def, Ps, St0) ->
+ St = pat_bin_tail_check(Ss, St0),
pat_bin(Ss, Def, Ps, St);
pattern(#c_alias{var=V,pat=P}, Def, Ps, St0) ->
{Vvs,St1} = variable(V, Ps, St0),
@@ -482,6 +485,19 @@ pat_segment(#c_bitstr{val=V,size=S,type=T}, Def0, Ps0, St0) ->
pat_segment(_, Def, Ps, St) ->
{Ps,Def,add_error({not_bs_pattern,St#lint.func}, St)}.
+%% pat_bin_tail_check([Elem], State) -> State.
+%% There must be at most one tail segment (a size-less segment of
+%% type binary) and it must occur at the end.
+
+pat_bin_tail_check([#c_bitstr{size=#c_literal{val=all}}], St) ->
+ %% Size-less field is OK at the end of the list of segments.
+ St;
+pat_bin_tail_check([#c_bitstr{size=#c_literal{val=all}}|_], St) ->
+ add_error({tail_segment_not_at_end,St#lint.func}, St);
+pat_bin_tail_check([_|Ss], St) ->
+ pat_bin_tail_check(Ss, St);
+pat_bin_tail_check([], St) -> St.
+
%% pat_bit_expr(SizePat, Type, Defined, State) -> State.
%% Check the Size pattern, this is an input! Because of optimizations,
%% we must allow any kind of constant and literal here.
diff --git a/lib/compiler/src/v3_core.erl b/lib/compiler/src/v3_core.erl
index f6bb45787c..2da24b2908 100644
--- a/lib/compiler/src/v3_core.erl
+++ b/lib/compiler/src/v3_core.erl
@@ -892,25 +892,22 @@ lc_tq(Line, E, [{generate,Lg,P,G}|Qs0], Mc, St0) ->
lc_tq(Line, E, [{b_generate,Lg,P,G}|Qs0], Mc, St0) ->
{Gs,Qs1} = splitwith(fun is_guard_test/1, Qs0),
{Name,St1} = new_fun_name("blc", St0),
- {Tname,St2} = new_var_name(St1),
- LA = lineno_anno(Line, St2),
+ LA = lineno_anno(Line, St1),
LAnno = #a{anno=LA},
- HeadBinPattern = pattern(P,St2),
- #c_binary{segments=Ps} = HeadBinPattern,
- {EPs,St3} = emasculate_segments(Ps,St2),
- Tail = #c_var{anno=LA,name=Tname},
- TailSegment = #c_bitstr{val=Tail,size=#c_literal{val=all},
- unit=#c_literal{val=1},
- type=#c_literal{val=binary},
- flags=#c_literal{val=[big,unsigned]}},
- Pattern = HeadBinPattern#c_binary{segments=Ps ++ [TailSegment]},
- EPattern = HeadBinPattern#c_binary{segments=EPs ++ [TailSegment]},
+ HeadBinPattern = pattern(P, St1),
+ #c_binary{segments=Ps0} = HeadBinPattern,
+ {Ps,Tail,St2} = append_tail_segment(Ps0, St1),
+ {EPs,St3} = emasculate_segments(Ps, St2),
+ Pattern = HeadBinPattern#c_binary{segments=Ps},
+ EPattern = HeadBinPattern#c_binary{segments=EPs},
{Arg,St4} = new_var(St3),
{Guardc,St5} = lc_guard_tests(Gs, St4), %These are always flat!
+ Tname = Tail#c_var.name,
{Nc,[],St6} = expr({call,Lg,{atom,Lg,Name},[{var,Lg,Tname}]}, St5),
{Bc,Bps,St7} = lc_tq(Line, E, Qs1, Nc, St6),
{Gc,Gps,St10} = safe(G, St7), %Will be a function argument!
Fc = function_clause([Arg], LA, {Name,1}),
+ {TailSegList,_,St} = append_tail_segment([], St10),
Cs = [#iclause{anno=#a{anno=[compiler_generated|LA]},
pats=[Pattern],
guard=Guardc,
@@ -922,14 +919,14 @@ lc_tq(Line, E, [{b_generate,Lg,P,G}|Qs0], Mc, St0) ->
op=#c_var{anno=LA,name={Name,1}},
args=[Tail]}]},
#iclause{anno=LAnno,
- pats=[#c_binary{anno=LA, segments=[TailSegment]}],guard=[],
+ pats=[#c_binary{anno=LA,segments=TailSegList}],guard=[],
body=[Mc]}],
Fun = #ifun{anno=LAnno,id=[],vars=[Arg],clauses=Cs,fc=Fc},
{#iletrec{anno=LAnno,defs=[{{Name,1},Fun}],
body=Gps ++ [#iapply{anno=LAnno,
op=#c_var{anno=LA,name={Name,1}},
args=[Gc]}]},
- [],St10};
+ [],St};
lc_tq(Line, E, [Fil0|Qs0], Mc, St0) ->
%% Special case sequences guard tests.
LA = lineno_anno(Line, St0),
@@ -1037,26 +1034,24 @@ bc_tq1(Line, E, [{b_generate,Lg,P,G}|Qs0], AccExpr, St0) ->
{Gs,Qs1} = splitwith(fun is_guard_test/1, Qs0),
{Name,St1} = new_fun_name("lbc", St0),
LA = lineno_anno(Line, St1),
- {[Tail,AccVar],St2} = new_vars(LA, 2, St1),
+ {AccVar,St2} = new_var(LA, St1),
LAnno = #a{anno=LA},
HeadBinPattern = pattern(P, St2),
- #c_binary{segments=Ps} = HeadBinPattern,
- {EPs,St3} = emasculate_segments(Ps, St2),
- TailSegment = #c_bitstr{val=Tail,size=#c_literal{val=all},
- unit=#c_literal{val=1},
- type=#c_literal{val=binary},
- flags=#c_literal{val=[big,unsigned]}},
- Pattern = HeadBinPattern#c_binary{segments=Ps ++ [TailSegment]},
- EPattern = HeadBinPattern#c_binary{segments=EPs ++ [TailSegment]},
- {Arg,St4} = new_var(St3),
+ #c_binary{segments=Ps0} = HeadBinPattern,
+ {Ps,Tail,St3} = append_tail_segment(Ps0, St2),
+ {EPs,St4} = emasculate_segments(Ps, St3),
+ Pattern = HeadBinPattern#c_binary{segments=Ps},
+ EPattern = HeadBinPattern#c_binary{segments=EPs},
+ {Arg,St5} = new_var(St4),
NewMore = {call,Lg,{atom,Lg,Name},[{var,Lg,Tail#c_var.name},
{var,Lg,AccVar#c_var.name}]},
- {Guardc,St5} = lc_guard_tests(Gs, St4), %These are always flat!
- {Bc,Bps,St6} = bc_tq1(Line, E, Qs1, AccVar, St5),
- {Nc,Nps,St7} = expr(NewMore, St6),
- {Gc,Gps,St8} = safe(G, St7), %Will be a function argument!
+ {Guardc,St6} = lc_guard_tests(Gs, St5), %These are always flat!
+ {Bc,Bps,St7} = bc_tq1(Line, E, Qs1, AccVar, St6),
+ {Nc,Nps,St8} = expr(NewMore, St7),
+ {Gc,Gps,St9} = safe(G, St8), %Will be a function argument!
Fc = function_clause([Arg,AccVar], LA, {Name,2}),
Body = Bps ++ Nps ++ [#iset{var=AccVar,arg=Bc},Nc],
+ {TailSegList,_,St} = append_tail_segment([], St9),
Cs = [#iclause{anno=LAnno,
pats=[Pattern,AccVar],
guard=Guardc,
@@ -1066,7 +1061,7 @@ bc_tq1(Line, E, [{b_generate,Lg,P,G}|Qs0], AccExpr, St0) ->
guard=[],
body=Nps ++ [Nc]},
#iclause{anno=LAnno,
- pats=[#c_binary{anno=LA,segments=[TailSegment]},AccVar],
+ pats=[#c_binary{anno=LA,segments=TailSegList},AccVar],
guard=[],
body=[AccVar]}],
Fun = #ifun{anno=LAnno,id=[],vars=[Arg,AccVar],clauses=Cs,fc=Fc},
@@ -1074,7 +1069,7 @@ bc_tq1(Line, E, [{b_generate,Lg,P,G}|Qs0], AccExpr, St0) ->
body=Gps ++ [#iapply{anno=LAnno,
op=#c_var{anno=LA,name={Name,2}},
args=[Gc,AccExpr]}]},
- [],St8};
+ [],St};
bc_tq1(Line, E, [Fil0|Qs0], AccVar, St0) ->
%% Special case sequences guard tests.
LA = lineno_anno(Line, St0),
@@ -1120,6 +1115,29 @@ bc_tq1(_, {bin,Bl,Elements}, [], AccVar, St0) ->
%%Anno = Anno0#a{anno=[compiler_generated|A]},
{set_anno(E, Anno),Pre,St}.
+append_tail_segment(Segs, St) ->
+ app_tail_seg(Segs, St, []).
+
+app_tail_seg([#c_bitstr{val=Var0,size=#c_literal{val=all}}=Seg0]=L,
+ St0, Acc) ->
+ case Var0 of
+ #c_var{name='_'} ->
+ {Var,St} = new_var(St0),
+ Seg = Seg0#c_bitstr{val=Var},
+ {reverse(Acc, [Seg]),Var,St};
+ #c_var{} ->
+ {reverse(Acc, L),Var0,St0}
+ end;
+app_tail_seg([H|T], St, Acc) ->
+ app_tail_seg(T, St, [H|Acc]);
+app_tail_seg([], St0, Acc) ->
+ {Var,St} = new_var(St0),
+ Tail = #c_bitstr{val=Var,size=#c_literal{val=all},
+ unit=#c_literal{val=1},
+ type=#c_literal{val=binary},
+ flags=#c_literal{val=[unsigned,big]}},
+ {reverse(Acc, [Tail]),Var,St}.
+
emasculate_segments(Segs, St) ->
emasculate_segments(Segs, St, []).
diff --git a/lib/compiler/test/bs_bincomp_SUITE.erl b/lib/compiler/test/bs_bincomp_SUITE.erl
index a64a5d590b..74f69893af 100644
--- a/lib/compiler/test/bs_bincomp_SUITE.erl
+++ b/lib/compiler/test/bs_bincomp_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2006-2009. All Rights Reserved.
+%% Copyright Ericsson AB 2006-2010. 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
@@ -24,7 +24,7 @@
-export([all/1,
byte_aligned/1,bit_aligned/1,extended_byte_aligned/1,
extended_bit_aligned/1,mixed/1,filters/1,trim_coverage/1,
- nomatch/1,sizes/1]).
+ nomatch/1,sizes/1,tail/1]).
-include("test_server.hrl").
@@ -32,7 +32,7 @@ all(suite) ->
test_lib:recompile(?MODULE),
[byte_aligned,bit_aligned,extended_byte_aligned,
extended_bit_aligned,mixed,filters,trim_coverage,
- nomatch,sizes].
+ nomatch,sizes,tail].
byte_aligned(Config) when is_list(Config) ->
@@ -270,6 +270,38 @@ sizes(Config) when is_list(Config) ->
?line cs_end(),
ok.
+tail(Config) when is_list(Config) ->
+ ?line [] = tail_1(<<0:7>>),
+ ?line [0] = tail_1(<<0>>),
+ ?line [0] = tail_1(<<0:12>>),
+ ?line [0,0] = tail_1(<<0:20>>),
+
+ ?line [] = tail_2(<<0:7>>),
+ ?line [42] = tail_2(<<0>>),
+ ?line [] = tail_2(<<0:12>>),
+ ?line [42,42] = tail_2(<<0,1>>),
+
+ ?line <<>> = tail_3(<<0:7>>),
+ ?line <<42>> = tail_3(<<0>>),
+ ?line <<42>> = tail_3(<<0:12>>),
+ ?line <<42,42>> = tail_3(<<0:20>>),
+
+ ?line [] = tail_4(<<0:15>>),
+ ?line [7] = tail_4(<<7,8>>),
+ ?line [9] = tail_4(<<9,17:12>>),
+ ok.
+
+tail_1(Bits) ->
+ [X || <<X:8/integer, _/bits>> <= Bits].
+
+tail_2(Bits) ->
+ [42 || <<_:8/integer, _/bytes>> <= Bits].
+
+tail_3(Bits) ->
+ << <<42>> || <<_:8/integer, _/bits>> <= Bits >>.
+
+tail_4(Bits) ->
+ [X || <<X:8/integer, Tail/bits>> <= Bits, bit_size(Tail) >= 8].
cs_init() ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 23:12:51 +0000