aboutsummaryrefslogtreecommitdiffstats
path: root/lib/compiler/src/beam_utils.erl
diff options
context:
space:
mode:
Diffstat (limited to 'lib/compiler/src/beam_utils.erl')
-rw-r--r--lib/compiler/src/beam_utils.erl104
1 files changed, 66 insertions, 38 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl
index 8ca368c167..68d6105cfa 100644
--- a/lib/compiler/src/beam_utils.erl
+++ b/lib/compiler/src/beam_utils.erl
@@ -3,16 +3,17 @@
%%
%% Copyright Ericsson AB 2007-2013. 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/.
+%% 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
%%
-%% 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.
+%% 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%
%%
@@ -26,6 +27,8 @@
code_at/2,bif_to_test/3,is_pure_test/1,
live_opt/1,delete_live_annos/1,combine_heap_needs/2]).
+-export([join_even/2,split_even/1]).
+
-import(lists, [member/2,sort/1,reverse/1,splitwith/2]).
-record(live,
@@ -126,8 +129,7 @@ empty_label_index() ->
%% Add an index for a label.
index_label(Lbl, Is0, Acc) ->
- Is = lists:dropwhile(fun({label,_}) -> true;
- (_) -> false end, Is0),
+ Is = drop_labels(Is0),
gb_trees:enter(Lbl, Is, Acc).
@@ -185,7 +187,7 @@ is_pure_test({test,is_lt,_,[_,_]}) -> true;
is_pure_test({test,is_nil,_,[_]}) -> true;
is_pure_test({test,is_nonempty_list,_,[_]}) -> true;
is_pure_test({test,test_arity,_,[_,_]}) -> true;
-is_pure_test({test,has_map_fields,_,[_,{list,_}]}) -> true;
+is_pure_test({test,has_map_fields,_,[_|_]}) -> true;
is_pure_test({test,Op,_,Ops}) ->
erl_internal:new_type_test(Op, length(Ops)).
@@ -194,7 +196,7 @@ is_pure_test({test,Op,_,Ops}) ->
%% Go through the instruction sequence in reverse execution
%% order, keep track of liveness and remove 'move' instructions
%% whose destination is a register that will not be used.
-%% Also insert {'%live',Live} annotations at the beginning
+%% Also insert {'%live',Live,Regs} annotations at the beginning
%% and end of each block.
%%
live_opt(Is0) ->
@@ -215,7 +217,7 @@ delete_live_annos([{block,Bl0}|Is]) ->
[] -> delete_live_annos(Is);
[_|_]=Bl -> [{block,Bl}|delete_live_annos(Is)]
end;
-delete_live_annos([{'%live',_}|Is]) ->
+delete_live_annos([{'%live',_,_}|Is]) ->
delete_live_annos(Is);
delete_live_annos([I|Is]) ->
[I|delete_live_annos(Is)];
@@ -342,14 +344,10 @@ check_liveness(R, [{call_ext,Live,_}=I|Is], St) ->
false ->
check_liveness(R, Is, St);
true ->
- %% We must make sure we don't check beyond this instruction
- %% or we will fall through into random unrelated code and
- %% get stuck in a loop.
- %%
- %% We don't want to overwrite a 'catch', so consider this
- %% register in use.
- %%
- {used,St}
+ %% We must make sure we don't check beyond this
+ %% instruction or we will fall through into random
+ %% unrelated code and get stuck in a loop.
+ {killed,St}
end
end;
check_liveness(R, [{call_fun,Live}|Is], St) ->
@@ -364,11 +362,6 @@ check_liveness(R, [{apply,Args}|Is], St) ->
{x,_} -> {killed,St};
{y,_} -> check_liveness(R, Is, St)
end;
-check_liveness({x,R}, [{'%live',Live}|Is], St) ->
- if
- R < Live -> check_liveness(R, Is, St);
- true -> {killed,St}
- end;
check_liveness(R, [{bif,Op,{f,Fail},Ss,D}|Is], St0) ->
case check_liveness_fail(R, Op, Ss, Fail, St0) of
{killed,St} = Killed ->
@@ -475,6 +468,31 @@ check_liveness(R, [{loop_rec_end,{f,Fail}}|_], St) ->
check_liveness_at(R, Fail, St);
check_liveness(R, [{line,_}|Is], St) ->
check_liveness(R, Is, St);
+check_liveness(R, [{get_map_elements,{f,Fail},S,{list,L}}|Is], St0) ->
+ {Ss,Ds} = split_even(L),
+ case member(R, [S|Ss]) of
+ true ->
+ {used,St0};
+ false ->
+ case check_liveness_at(R, Fail, St0) of
+ {killed,St}=Killed ->
+ case member(R, Ds) of
+ true -> Killed;
+ false -> check_liveness(R, Is, St)
+ end;
+ Other ->
+ Other
+ end
+ end;
+check_liveness(R, [{test_heap,N,Live}|Is], St) ->
+ I = {block,[{set,[],[],{alloc,Live,{nozero,nostack,N,[]}}}]},
+ check_liveness(R, [I|Is], St);
+check_liveness(R, [{allocate_zero,N,Live}|Is], St) ->
+ I = {block,[{set,[],[],{alloc,Live,{zero,N,0,[]}}}]},
+ check_liveness(R, [I|Is], St);
+check_liveness(R, [{get_list,S,D1,D2}|Is], St) ->
+ I = {block,[{set,[D1,D2],[S],get_list}]},
+ check_liveness(R, [I|Is], St);
check_liveness(_R, Is, St) when is_list(Is) ->
%% case Is of
%% [I|_] ->
@@ -552,7 +570,7 @@ check_killed_block(R, [{set,Ds,Ss,_Op}|Is]) ->
false -> check_killed_block(R, Is)
end
end;
-check_killed_block(R, [{'%live',Live}|Is]) ->
+check_killed_block(R, [{'%live',Live,_}|Is]) ->
case R of
{x,X} when X >= Live -> killed;
_ -> check_killed_block(R, Is)
@@ -575,7 +593,7 @@ check_used_block({x,X}=R, [{set,Ds,Ss,{alloc,Live,Op}}|Is], St) ->
end;
check_used_block(R, [{set,Ds,Ss,Op}|Is], St) ->
check_used_block_1(R, Ss, Ds, Op, Is, St);
-check_used_block(R, [{'%live',Live}|Is], St) ->
+check_used_block(R, [{'%live',Live,_}|Is], St) ->
case R of
{x,X} when X >= Live -> {killed,St};
_ -> check_used_block(R, Is, St)
@@ -615,13 +633,15 @@ is_reg_used_at_1(R, Lbl, St0) ->
end.
index_labels_1([{label,Lbl}|Is0], Acc) ->
- Is = lists:dropwhile(fun({label,_}) -> true;
- (_) -> false end, Is0),
+ Is = drop_labels(Is0),
index_labels_1(Is0, [{Lbl,Is}|Acc]);
index_labels_1([_|Is], Acc) ->
index_labels_1(Is, Acc);
index_labels_1([], Acc) -> gb_trees:from_orddict(sort(Acc)).
+drop_labels([{label,_}|Is]) -> drop_labels(Is);
+drop_labels(Is) -> Is.
+
%% Help functions for combine_heap_needs.
combine_alloc_lists(Al1, Al2) ->
@@ -676,9 +696,9 @@ live_opt([{test,bs_start_match2,Fail,Live,[Src,_],_}=I|Is], _, D, Acc) ->
%% Other instructions.
live_opt([{block,Bl0}|Is], Regs0, D, Acc) ->
- Live0 = {'%live',live_regs(Regs0)},
+ Live0 = {'%live',live_regs(Regs0),Regs0},
{Bl,Regs} = live_opt_block(reverse(Bl0), Regs0, D, [Live0]),
- Live = {'%live',live_regs(Regs)},
+ Live = {'%live',live_regs(Regs),Regs},
live_opt(Is, Regs, D, [{block,[Live|Bl]}|Acc]);
live_opt([{label,L}=I|Is], Regs, D0, Acc) ->
D = gb_trees:insert(L, Regs, D0),
@@ -756,13 +776,9 @@ live_opt([{line,_}=I|Is], Regs, D, Acc) ->
live_opt(Is, Regs, D, [I|Acc]);
%% The following instructions can occur if the "compilation" has been
-%% started from a .S file using the 'asm' option.
+%% started from a .S file using the 'from_asm' option.
live_opt([{trim,_,_}=I|Is], Regs, D, Acc) ->
live_opt(Is, Regs, D, [I|Acc]);
-live_opt([{allocate,_,Live}=I|Is], _, D, Acc) ->
- live_opt(Is, live_call(Live), D, [I|Acc]);
-live_opt([{allocate_heap,_,_,Live}=I|Is], _, D, Acc) ->
- live_opt(Is, live_call(Live), D, [I|Acc]);
live_opt([{'%',_}=I|Is], Regs, D, Acc) ->
live_opt(Is, Regs, D, [I|Acc]);
live_opt([{recv_set,_}=I|Is], Regs, D, Acc) ->
@@ -832,3 +848,15 @@ x_live([_|Rs], Regs) -> x_live(Rs, Regs);
x_live([], Regs) -> Regs.
is_live(X, Regs) -> ((Regs bsr X) band 1) =:= 1.
+
+%% split_even/1
+%% [1,2,3,4,5,6] -> {[1,3,5],[2,4,6]}
+split_even(Rs) -> split_even(Rs,[],[]).
+split_even([],Ss,Ds) -> {reverse(Ss),reverse(Ds)};
+split_even([S,D|Rs],Ss,Ds) ->
+ split_even(Rs,[S|Ss],[D|Ds]).
+
+%% join_even/1
+%% {[1,3,5],[2,4,6]} -> [1,2,3,4,5,6]
+join_even([],[]) -> [];
+join_even([S|Ss],[D|Ds]) -> [S,D|join_even(Ss,Ds)].
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-13 10:02:14 +0000