diff options
Diffstat (limited to 'lib/compiler/src/beam_asm.erl')
| -rw-r--r-- | lib/compiler/src/beam_asm.erl | 52 |
1 files changed, 35 insertions, 17 deletions
diff --git a/lib/compiler/src/beam_asm.erl b/lib/compiler/src/beam_asm.erl index 6e63c4d0f2..4a9c12dfea 100644 --- a/lib/compiler/src/beam_asm.erl +++ b/lib/compiler/src/beam_asm.erl @@ -146,8 +146,10 @@ build_file(Code, Attr, Dict, NumLabels, NumFuncs, Abst, SourceFile, Opts) -> Essentials0 = [AtomChunk,CodeChunk,StringChunk,ImportChunk, ExpChunk,LambdaChunk,LiteralChunk], - Essentials = [iolist_to_binary(C) || C <- Essentials0], - {Attributes,Compile} = build_attributes(Opts, SourceFile, Attr, Essentials), + Essentials1 = [iolist_to_binary(C) || C <- Essentials0], + MD5 = module_md5(Essentials1), + Essentials = finalize_fun_table(Essentials1, MD5), + {Attributes,Compile} = build_attributes(Opts, SourceFile, Attr, MD5), AttrChunk = chunk(<<"Attr">>, Attributes), CompileChunk = chunk(<<"CInf">>, Compile), @@ -166,6 +168,24 @@ build_file(Code, Attr, Dict, NumLabels, NumFuncs, Abst, SourceFile, Opts) -> end, build_form(<<"BEAM">>, Chunks). +%% finalize_fun_table(Essentials, MD5) -> FinalizedEssentials +%% Update the 'old_uniq' field in the entry for each fun in the +%% 'FunT' chunk. We'll use part of the MD5 for the module as a +%% unique value. + +finalize_fun_table(Essentials, MD5) -> + [finalize_fun_table_1(E, MD5) || E <- Essentials]. + +finalize_fun_table_1(<<"FunT",Keep:8/binary,Table0/binary>>, MD5) -> + <<Uniq:27,_:101/bits>> = MD5, + Table = finalize_fun_table_2(Table0, Uniq, <<>>), + <<"FunT",Keep/binary,Table/binary>>; +finalize_fun_table_1(Chunk, _) -> Chunk. + +finalize_fun_table_2(<<Keep:20/binary,0:32,T/binary>>, Uniq, Acc) -> + finalize_fun_table_2(T, Uniq, <<Acc/binary,Keep/binary,Uniq:32>>); +finalize_fun_table_2(<<>>, _, Acc) -> Acc. + %% Build an IFF form. build_form(Id, Chunks0) when byte_size(Id) =:= 4, is_list(Chunks0) -> @@ -202,7 +222,7 @@ flatten_exports(Exps) -> flatten_imports(Imps) -> list_to_binary(map(fun({M,F,A}) -> <<M:32,F:32,A:32>> end, Imps)). -build_attributes(Opts, SourceFile, Attr, Essentials) -> +build_attributes(Opts, SourceFile, Attr, MD5) -> Misc = case member(slim, Opts) of false -> {{Y,Mo,D},{H,Mi,S}} = erlang:universaltime(), @@ -210,7 +230,7 @@ build_attributes(Opts, SourceFile, Attr, Essentials) -> true -> [] end, Compile = [{options,Opts},{version,?COMPILER_VSN}|Misc], - {term_to_binary(calc_vsn(Attr, Essentials)),term_to_binary(Compile)}. + {term_to_binary(set_vsn_attribute(Attr, MD5)),term_to_binary(Compile)}. build_line_table(Dict) -> {NumLineInstrs,NumFnames0,Fnames0,NumLines,Lines0} = @@ -243,32 +263,30 @@ encode_line_items([], _) -> []. %% We'll not change an existing 'vsn' attribute. %% -calc_vsn(Attr, Essentials0) -> +set_vsn_attribute(Attr, MD5) -> case keymember(vsn, 1, Attr) of true -> Attr; false -> - Essentials = filter_essentials(Essentials0), - <<Number:128>> = erlang:md5(Essentials), + <<Number:128>> = MD5, [{vsn,[Number]}|Attr] end. +module_md5(Essentials0) -> + Essentials = filter_essentials(Essentials0), + erlang:md5(Essentials). + %% filter_essentials([Chunk]) -> [Chunk'] %% Filter essentials so that we obtain the same MD5 as code:module_md5/1 and -%% beam_lib:md5/1 would calculate for this module. +%% beam_lib:md5/1 would calculate for this module. Note that at this +%% point, the 'old_uniq' entry for each fun in the 'FunT' chunk is zeroed, +%% so there is no need to go through the 'FunT' chunk. -filter_essentials([<<"FunT",_Sz:4/binary,Entries:4/binary,Table0/binary>>|T]) -> - Table = filter_funtab(Table0, <<0:32>>), - [Entries,Table|filter_essentials(T)]; filter_essentials([<<_Tag:4/binary,Sz:32,Data:Sz/binary,_Padding/binary>>|T]) -> [Data|filter_essentials(T)]; filter_essentials([<<>>|T]) -> filter_essentials(T); filter_essentials([]) -> []. -filter_funtab(<<Important:20/binary,_OldUniq:4/binary,T/binary>>, Zero) -> - [Important,Zero|filter_funtab(T, Zero)]; -filter_funtab(<<>>, _) -> []. - bif_type(fnegate, 1) -> {op,fnegate}; bif_type(fadd, 2) -> {op,fadd}; bif_type(fsub, 2) -> {op,fsub}; @@ -310,8 +328,8 @@ make_op({test,Cond,Fail,Ops}, Dict) when is_list(Ops) -> encode_op(Cond, [Fail|Ops], Dict); make_op({test,Cond,Fail,Live,[Op|Ops],Dst}, Dict) when is_list(Ops) -> encode_op(Cond, [Fail,Op,Live|Ops++[Dst]], Dict); -make_op({make_fun2,{f,Lbl},Index,OldUniq,NumFree}, Dict0) -> - {Fun,Dict} = beam_dict:lambda(Lbl, Index, OldUniq, NumFree, Dict0), +make_op({make_fun2,{f,Lbl},_Index,_OldUniq,NumFree}, Dict0) -> + {Fun,Dict} = beam_dict:lambda(Lbl, NumFree, Dict0), make_op({make_fun2,Fun}, Dict); make_op({kill,Y}, Dict) -> make_op({init,Y}, Dict); |