aboutsummaryrefslogtreecommitdiffstats
path: root/lib/compiler/src/beam_jump.erl
diff options
context:
space:
mode:
Diffstat (limited to 'lib/compiler/src/beam_jump.erl')
-rw-r--r--lib/compiler/src/beam_jump.erl51
1 files changed, 32 insertions, 19 deletions
diff --git a/lib/compiler/src/beam_jump.erl b/lib/compiler/src/beam_jump.erl
index 3cab55c4cb..db67d24514 100644
--- a/lib/compiler/src/beam_jump.erl
+++ b/lib/compiler/src/beam_jump.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1999-2010. All Rights Reserved.
+%% 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
@@ -169,7 +169,7 @@ share_1([{label,L}=Lbl|Is], Dict0, Seq, Acc) ->
share_1(Is, Dict0, [], [Lbl,{jump,{f,Label}}|Acc])
end;
share_1([{func_info,_,_,_}=I|Is], _, [], Acc) ->
- Is++[I|Acc];
+ reverse(Is, [I|Acc]);
share_1([I|Is], Dict, Seq, Acc) ->
case is_unreachable_after(I) of
false ->
@@ -206,25 +206,35 @@ is_label(_) -> false.
move(Is) ->
move_1(Is, [], []).
-move_1([I|Is], End, Acc) ->
+move_1([I|Is], End0, Acc0) ->
case is_exit_instruction(I) of
- false -> move_1(Is, End, [I|Acc]);
- true -> move_2(I, Is, End, Acc)
+ false ->
+ move_1(Is, End0, [I|Acc0]);
+ true ->
+ case extract_seq(Acc0, [I|End0]) of
+ no ->
+ move_1(Is, End0, [I|Acc0]);
+ {yes,End,Acc} ->
+ move_1(Is, End, Acc)
+ end
end;
-move_1([], End, Acc) ->
- reverse(Acc, reverse(End)).
-
-move_2(Exit, Is, End, [{block,_},{label,_},{func_info,_,_,_}|_]=Acc) ->
- move_1(Is, End, [Exit|Acc]);
-move_2(Exit, Is, End, [{block,_}=Blk,{label,_}=Lbl,Unreachable|More]) ->
- move_1([Unreachable|Is], [Exit,Blk,Lbl|End], More);
-move_2(Exit, Is, End, [{bs_context_to_binary,_}=Bs,{label,_}=Lbl,
- Unreachable|More]) ->
- move_1([Unreachable|Is], [Exit,Bs,Lbl|End], More);
-move_2(Exit, Is, End, [{label,_}=Lbl,Unreachable|More]) ->
- move_1([Unreachable|Is], [Exit,Lbl|End], More);
-move_2(Exit, Is, End, Acc) ->
- move_1(Is, End, [Exit|Acc]).
+move_1([], End, Acc) -> reverse(Acc, End).
+
+extract_seq([{line,_}=Line|Is], Acc) ->
+ extract_seq(Is, [Line|Acc]);
+extract_seq([{block,_}=Bl|Is], Acc) ->
+ extract_seq_1(Is, [Bl|Acc]);
+extract_seq([{label,_}|_]=Is, Acc) ->
+ extract_seq_1(Is, Acc);
+extract_seq(_, _) -> no.
+
+extract_seq_1([{line,_}=Line|Is], Acc) ->
+ extract_seq_1(Is, [Line|Acc]);
+extract_seq_1([{label,_},{func_info,_,_,_}|_], _) ->
+ no;
+extract_seq_1([{label,_}=Lbl|Is], Acc) ->
+ {yes,[Lbl|Acc],Is};
+extract_seq_1(_, _) -> no.
%%%
%%% (3) (4) (5) (6) Jump and unreachable code optimizations.
@@ -454,6 +464,7 @@ is_label_used_in_2({set,_,_,Info}, Lbl) ->
{put_tuple,_} -> false;
{get_tuple_element,_} -> false;
{set_tuple_element,_} -> false;
+ {line,_} -> false;
_ when is_atom(Info) -> false
end.
@@ -487,6 +498,8 @@ rem_unused([], _, Acc) -> reverse(Acc).
initial_labels(Is) ->
initial_labels(Is, []).
+initial_labels([{line,_}|Is], Acc) ->
+ initial_labels(Is, Acc);
initial_labels([{label,Lbl}|Is], Acc) ->
initial_labels(Is, [Lbl|Acc]);
initial_labels([{func_info,_,_,_},{label,Lbl}|_], Acc) ->