diff options
Diffstat (limited to 'lib/compiler/src/beam_dead.erl')
| -rw-r--r-- | lib/compiler/src/beam_dead.erl | 56 |
1 files changed, 20 insertions, 36 deletions
diff --git a/lib/compiler/src/beam_dead.erl b/lib/compiler/src/beam_dead.erl index bb93110176..9f81a6ab43 100644 --- a/lib/compiler/src/beam_dead.erl +++ b/lib/compiler/src/beam_dead.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2002-2010. All Rights Reserved. +%% Copyright Ericsson AB 2002-2011. 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 @@ -144,9 +144,9 @@ function({function,Name,Arity,CLabel,Is0}, Lc0) -> %% Initialize label information with the code %% for the func_info label. Without it, a register %% may seem to be live when it is not. - [{label,L},{func_info,_,_,_}=FI|_] = Is1, + [{label,L}|FiIs] = Is1, D0 = beam_utils:empty_label_index(), - D = beam_utils:index_label(L, [FI], D0), + D = beam_utils:index_label(L, FiIs, D0), %% Optimize away dead code. {Is2,Lc} = forward(Is1, Lc0), @@ -162,14 +162,11 @@ function({function,Name,Arity,CLabel,Is0}, Lc0) -> %% We must split the basic block when we encounter instructions with labels, %% such as catches and BIFs. All labels must be visible outside the blocks. -%% Also remove empty blocks. split_blocks({function,Name,Arity,CLabel,Is0}) -> Is = split_blocks(Is0, []), {function,Name,Arity,CLabel,Is}. -split_blocks([{block,[]}|Is], Acc) -> - split_blocks(Is, Acc); split_blocks([{block,Bl}|Is], Acc0) -> Acc = split_block(Bl, [], Acc0), split_blocks(Is, Acc); @@ -188,6 +185,8 @@ split_block([{set,[R],As,{alloc,Live,{gc_bif,N,{f,Lbl}=Fail}}}|Is], Bl, Acc) split_block(Is, [], [{gc_bif,N,Fail,Live,As,R}|make_block(Bl, Acc)]); split_block([{set,[R],[],{'catch',L}}|Is], Bl, Acc) -> split_block(Is, [], [{'catch',R,L}|make_block(Bl, Acc)]); +split_block([{set,[],[],{line,_}=Line}|Is], Bl, Acc) -> + split_block(Is, [], [Line|make_block(Bl, Acc)]); split_block([I|Is], Bl, Acc) -> split_block(Is, [I|Bl], Acc); split_block([], Bl, Acc) -> make_block(Bl, Acc). @@ -246,30 +245,24 @@ forward([{select_val,Reg,_,{list,List}}=I|Is], D0, Lc, Acc) -> D = update_value_dict(List, Reg, D0), forward(Is, D, Lc, [I|Acc]); forward([{label,Lbl}=LblI,{block,[{set,[Dst],[Lit],move}|BlkIs]}=Blk|Is], D, Lc, Acc) -> + %% Assumption: The target labels in a select_val/3 instruction + %% cannot be reached in any other way than through the select_val/3 + %% instruction (i.e. there can be no fallthrough to such label and + %% it cannot be referenced by, for example, a jump/1 instruction). Block = case gb_trees:lookup({Lbl,Dst}, D) of - {value,Lit} -> - %% The move instruction seems to be redundant, but also make - %% sure that the instruction preceeding the label - %% cannot fall through to the move instruction. - case is_unreachable_after(Acc) of - false -> Blk; %Must keep move instruction. - true -> {block,BlkIs} %Safe to remove move instruction. - end; - _ -> Blk %Keep move instruction. + {value,Lit} -> {block,BlkIs}; %Safe to remove move instruction. + _ -> Blk %Must keep move instruction. end, forward([Block|Is], D, Lc, [LblI|Acc]); forward([{label,Lbl}=LblI|[{move,Lit,Dst}|Is1]=Is0], D, Lc, Acc) -> + %% Assumption: The target labels in a select_val/3 instruction + %% cannot be reached in any other way than through the select_val/3 + %% instruction (i.e. there can be no fallthrough to such label and + %% it cannot be referenced by, for example, a jump/1 instruction). Is = case gb_trees:lookup({Lbl,Dst}, D) of - {value,Lit} -> - %% The move instruction seems to be redundant, but also make - %% sure that the instruction preceeding the label - %% cannot fall through to the move instruction. - case is_unreachable_after(Acc) of - false -> Is0; %Must keep move instruction. - true -> Is1 %Safe to remove move instruction. - end; - _ -> Is0 %Keep move instruction. - end, + {value,Lit} -> Is1; %Safe to remove move instruction. + _ -> Is0 %Keep move instruction. + end, forward(Is, D, Lc, [LblI|Acc]); forward([{test,is_eq_exact,_,[Dst,Src]}=I, {block,[{set,[Dst],[Src],move}|Bl]}|Is], D, Lc, Acc) -> @@ -299,16 +292,12 @@ update_value_dict([Lit,{f,Lbl}|T], Reg, D0) -> Key = {Lbl,Reg}, D = case gb_trees:lookup(Key, D0) of none -> gb_trees:insert(Key, Lit, D0); %New. - {value,Lit} -> D0; %Already correct. {value,inconsistent} -> D0; %Inconsistent. {value,_} -> gb_trees:update(Key, inconsistent, D0) end, update_value_dict(T, Reg, D); update_value_dict([], _, D) -> D. -is_unreachable_after([I|_]) -> - beam_jump:is_unreachable_after(I). - %%% %%% Scan instructions in reverse execution order and remove dead code. %%% @@ -419,7 +408,7 @@ backward([{test,Op,{f,To0},Live,Ops0,Dst}|Is], D, Acc) -> end, I = {test,Op,{f,To},Live,Ops0,Dst}, backward(Is, D, [I|Acc]); -backward([{kill,_}=I|Is], D, [Exit|_]=Acc) -> +backward([{kill,_}=I|Is], D, [{line,_},Exit|_]=Acc) -> case beam_jump:is_exit_instruction(Exit) of false -> backward(Is, D, [I|Acc]); true -> backward(Is, D, Acc) @@ -484,7 +473,7 @@ shortcut_fail_label(To0, Reg, Val, D) -> shortcut_boolean_label(To0, Reg, Bool0, D) when is_boolean(Bool0) -> case beam_utils:code_at(To0, D) of - [{bif,'not',_,[Reg],Reg},{jump,{f,To}}|_] -> + [{line,_},{bif,'not',_,[Reg],Reg},{jump,{f,To}}|_] -> Bool = not Bool0, {shortcut_select_label(To, Reg, Bool, D),Bool}; _ -> @@ -602,16 +591,11 @@ count_bits_matched([{test,_,_,_}|Is], SavePoint, Bits) -> count_bits_matched([{bs_save2,Reg,SavePoint}|_], {Reg,SavePoint}, Bits) -> %% The save point we are looking for - we are done. Bits; -count_bits_matched([{bs_save2,_,_}|Is], SavePoint, Bits) -> - %% Another save point - keep counting. - count_bits_matched(Is, SavePoint, Bits); count_bits_matched([_|_], _, Bits) -> Bits. shortcut_bs_pos_used(To, Reg, D) -> shortcut_bs_pos_used_1(beam_utils:code_at(To, D), Reg, D). -shortcut_bs_pos_used_1([{bs_restore2,Reg,_}|_], Reg, _) -> - false; shortcut_bs_pos_used_1([{bs_context_to_binary,Reg}|_], Reg, _) -> false; shortcut_bs_pos_used_1(Is, Reg, D) -> |