diff options
Diffstat (limited to 'lib/compiler/src/beam_clean.erl')
| -rw-r--r-- | lib/compiler/src/beam_clean.erl | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/lib/compiler/src/beam_clean.erl b/lib/compiler/src/beam_clean.erl index 919ee3ee7d..b736d39f9c 100644 --- a/lib/compiler/src/beam_clean.erl +++ b/lib/compiler/src/beam_clean.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2000-2013. All Rights Reserved. +%% Copyright Ericsson AB 2000-2016. 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. @@ -26,6 +26,9 @@ -export([clean_labels/1]). -import(lists, [map/2,foldl/3,reverse/1,filter/2]). +-spec module(beam_utils:module_code(), [compile:option()]) -> + {'ok',beam_utils:module_code()}. + module({Mod,Exp,Attr,Fs0,_}, Opts) -> Order = [Lbl || {function,_,_,Lbl,_} <- Fs0], All = foldl(fun({function,_,_,Lbl,_}=Func,D) -> dict:store(Lbl, Func, D) end, @@ -39,6 +42,10 @@ module({Mod,Exp,Attr,Fs0,_}, Opts) -> {ok,{Mod,Exp,Attr,Fs,Lc}}. %% Remove all bs_save2/2 instructions not referenced by a bs_restore2/2. + +-spec bs_clean_saves([beam_utils:instruction()]) -> + [beam_utils:instruction()]. + bs_clean_saves(Is) -> Needed = bs_restores(Is, []), bs_clean_saves_1(Is, gb_sets:from_list(Needed), []). @@ -98,13 +105,18 @@ add_to_work_list(F, {Fs,Used}=Sets) -> %%% want to see the expanded code in a .S file. %%% --record(st, {lmap, %Translation tables for labels. - entry, %Number of entry label. - lc %Label counter +-type label() :: beam_asm:label(). + +-record(st, {lmap :: [{label(),label()}], %Translation tables for labels. + entry :: beam_asm:label(), %Number of entry label. + lc :: non_neg_integer() %Label counter }). +-spec clean_labels([beam_utils:instruction()]) -> + {[beam_utils:instruction()],pos_integer()}. + clean_labels(Fs0) -> - St0 = #st{lmap=[],lc=1}, + St0 = #st{lmap=[],entry=1,lc=1}, {Fs1,#st{lmap=Lmap0,lc=Lc}} = function_renumber(Fs0, St0, []), Lmap = gb_trees:from_orddict(ordsets:from_list(Lmap0)), Fs = function_replace(Fs1, Lmap, []), @@ -141,7 +153,7 @@ renumber_labels([{bif,is_record,{f,_}, renumber_labels(Is, Acc, St); renumber_labels([{test,is_record,{f,_}=Fail, [Term,{atom,Tag}=TagAtom,{integer,Arity}]}|Is0], Acc, St) -> - Tmp = {x,1023}, + Tmp = {x,1022}, Is = case is_record_tuple(Term, Tag, Arity) of yes -> Is0; @@ -190,17 +202,11 @@ replace([{test,Test,{f,Lbl},Ops}|Is], Acc, D) -> replace([{test,Test,{f,Lbl},Live,Ops,Dst}|Is], Acc, D) -> replace(Is, [{test,Test,{f,label(Lbl, D)},Live,Ops,Dst}|Acc], D); replace([{select,I,R,{f,Fail0},Vls0}|Is], Acc, D) -> - Vls1 = map(fun ({f,L}) -> {f,label(L, D)}; - (Other) -> Other end, Vls0), + Vls = map(fun ({f,L}) -> {f,label(L, D)}; + (Other) -> Other + end, Vls0), Fail = label(Fail0, D), - case redundant_values(Vls1, Fail, []) of - [] -> - %% Oops, no choices left. The loader will not accept that. - %% Convert to a plain jump. - replace(Is, [{jump,{f,Fail}}|Acc], D); - Vls -> - replace(Is, [{select,I,R,{f,Fail},Vls}|Acc], D) - end; + replace(Is, [{select,I,R,{f,Fail},Vls}|Acc], D); replace([{'try',R,{f,Lbl}}|Is], Acc, D) -> replace(Is, [{'try',R,{f,label(Lbl, D)}}|Acc], D); replace([{'catch',R,{f,Lbl}}|Is], Acc, D) -> @@ -241,12 +247,6 @@ label(Old, D) -> {value,Val} -> Val; none -> throw({error,{undefined_label,Old}}) end. - -redundant_values([_,{f,Fail}|Vls], Fail, Acc) -> - redundant_values(Vls, Fail, Acc); -redundant_values([Val,Lbl|Vls], Fail, Acc) -> - redundant_values(Vls, Fail, [Lbl,Val|Acc]); -redundant_values([], _, Acc) -> reverse(Acc). %%% %%% Final fixup of bs_start_match2/5,bs_save2/bs_restore2 instructions for |