Erlangコード最適化メモ: JSONデコード処理(2): HiPEを使う ref: http://qiita.com/sile/items/b7aa22a79ac3785736fa

file0.erl

$ erl
Erlang R16B03-1 (erts-5.10.4) [source] [64-bit] [smp:2:2] [async-threads:10] [hipe]
Eshell V5.10.4  (abort with ^G)

%% nativeをコンパイルオプションに、指定するとHiPEコンパイラが使われる
> c(hoge, [native]).
{ok, hoge}.

%% hipe:help/0 でヘルプが表示できる
> hipe:help().
The HiPE Compiler (Version 3.10.2.2)

 The normal way to native-compile Erlang code using HiPE is to
 include `native' in the Erlang compiler options, as in:
     1> c(my_module, [native]).
 Options to the HiPE compiler must then be passed as follows:
     1> c(my_module, [native,{hipe,Options}]).
 Use `help_options()' for details.

 Utility functions:
   help()
     Prints this message.
   help_options()
     Prints a description of options recognized by the
     HiPE compiler.
   help_option(Option)
     Prints a description of that option.
   help_debug_options()
     Prints a description of debug options.
   version() ->
     Returns the HiPE version as a string'.

 For HiPE developers only:
  Use `help_hiper()' for information about HiPE's low-level interface
ok

%% 最適化レベルが選べたりもする (o3が最高, デフォルトはo2)
> c(hoge, [native, {hipe, [o3]}]).
{ok, hoge}.

file1.erl

%% HiPE無しでコンパイルした場合
> json_decode_1:decode(<<"[1,2,]">>). % 不正なJSONを渡す
** exception error: bad argument
     in function  json_decode_1:value/1
        called as json_decode_1:value(<<"]">>) % 引数情報がつく
     in call from json_decode_1:array/2 (json_decode_1.erl, line 44) % 行番号もつく
     in call from json_decode_1:decode/1 (json_decode_1.erl, line 18)

%% HiPE有りでコンパイルした場合
> json_decode_1:decode(<<"[1,2,]">>).
** exception error: bad argument
     in function  json_decode_1_hipe:value/1  % 関数名のみ
     in call from json_decode_1_hipe:array/2
     in call from json_decode_1_hipe:decode/1
     in call from lists:reverse/1             % 何故か経由していないはずの関数が含まれている