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| author | Lukas Larsson <[email protected]> | 2011-07-08 10:45:49 +0200 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2011-07-21 14:50:20 +0200 |
| commit | 6613732f28da2977c308500eacabea5fe332f5fa (patch) | |
| tree | a024d2a586312cd7e3c01bb139e8ad97f3e0fb02 /lib/asn1/src/asn1ct_constructed_per.erl | |
| parent | d39c96a320c1deef56de4d9468a98553bf004e28 (diff) | |
| download | otp-6613732f28da2977c308500eacabea5fe332f5fa.tar.gz otp-6613732f28da2977c308500eacabea5fe332f5fa.tar.bz2 otp-6613732f28da2977c308500eacabea5fe332f5fa.zip | |
Optmized decode_length by doing some calculations as compile time rather than runtime
Diffstat (limited to 'lib/asn1/src/asn1ct_constructed_per.erl')
| -rw-r--r-- | lib/asn1/src/asn1ct_constructed_per.erl | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/lib/asn1/src/asn1ct_constructed_per.erl b/lib/asn1/src/asn1ct_constructed_per.erl index c1b6aa5713..72c8a3fd9a 100644 --- a/lib/asn1/src/asn1ct_constructed_per.erl +++ b/lib/asn1/src/asn1ct_constructed_per.erl @@ -469,7 +469,8 @@ gen_decode_sof(Erules,Typename,SeqOrSetOf,D) when is_record(D,type) -> _ -> "" end, - emit({nl,"{Num,Bytes1} = ?RT_PER:decode_length(Bytes,",{asis,SizeConstraint},"),",nl}), + gen_decode_length(SizeConstraint, + is_optimized(Erules)), emit({"'dec_",asn1ct_gen:list2name(Typename), "_components'(Num, Bytes1, telltype",ObjFun,", []).",nl}), NewComponentType = @@ -480,6 +481,41 @@ gen_decode_sof(Erules,Typename,SeqOrSetOf,D) when is_record(D,type) -> end, gen_decode_sof_components(Erules,Typename,SeqOrSetOf,NewComponentType). +%% Logic copied from asn1_per_bin_rt2ct:decode_constrained_number +gen_decode_length({Lb,Ub},true) when Ub =< 65535, Lb >= 0 -> + Range = Ub - Lb + 1, + Call = if + Range == 1 -> + "{0,Bytes}"; + Range == 2 -> + "?RT_PER:getbits(Bytes,1)"; + Range =< 4 -> + "?RT_PER:getbits(Bytes,2)"; + Range =< 8 -> + "?RT_PER:getbits(Bytes,3)"; + Range =< 16 -> + "?RT_PER:getbits(Bytes,4)"; + Range =< 32 -> + "?RT_PER:getbits(Bytes,5)"; + Range =< 64 -> + "?RT_PER:getbits(Bytes,6)"; + Range =< 128 -> + "?RT_PER:getbits(Bytes,7)"; + Range =< 255 -> + "?RT_PER:getbits(Bytes,8)"; + Range =< 256 -> + "?RT_PER:getoctets(Bytes,1)"; + Range =< 65536 -> + "?RT_PER:getoctets(Bytes,2)"; + true -> + ["exit({not_supported,{integer_range,",Range,"}}"] + end, + emit({nl,"{Val,Remain} = ",Call,",",nl}), + emit({nl,"{Num,Bytes1} = {Val+",Lb,",Remain},",nl}); +gen_decode_length(SizeConstraint,_) -> + emit({nl,"{Num,Bytes1} = ?RT_PER:decode_length(Bytes,", + {asis,SizeConstraint},"),",nl}). + gen_encode_sof_components(Erule,Typename,SeqOrSetOf,Cont) -> {ObjFun,ObjFun_Var} = case Cont#type.tablecinf of |