{"id":460,"date":"2020-12-06T00:00:00","date_gmt":"2020-12-05T15:00:00","guid":{"rendered":"https:\/\/roundwide.com\/?p=460"},"modified":"2021-04-17T22:43:16","modified_gmt":"2021-04-17T13:43:16","slug":"nan-boxing-in-csharp","status":"publish","type":"post","link":"https:\/\/roundwide.com\/ja\/nan-boxing-in-csharp\/","title":{"rendered":"C#\u3067NaN Boxing"},"content":{"rendered":"\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4ee5\u524dC# Tokyo\u3067\u884c\u3063\u305f<a rel=\"noreferrer noopener\" href=\"https:\/\/speakerdeck.com\/kfujieda\/nan-boxingniyorujsonpasafalsegao-su-hua\" target=\"_blank\">\u30d7\u30ec\u30bc\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/a>\u3092\u5143\u306b\u3001JSON\u30d1\u30fc\u30b6\u30fc<a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/fujieda\/DynaJson\/\" target=\"_blank\">DynaJson<\/a>\u3067\u7528\u3044\u3066\u3044\u308bNaN Boxing\u3068\u3044\u3046\u6700\u9069\u5316\u6280\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u3002\u3053\u306e\u8a18\u4e8b\u306f<a href=\"https:\/\/qiita.com\/advent-calendar\/2020\/csharplang\">C# Advent Calendar 2020<\/a>\u306e6\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">DynaJson\u306b\u3064\u3044\u3066<\/h2>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/fujieda\/DynaJson\/\" target=\"_blank\">DynaJson<\/a>\u306f<a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/neuecc\/DynamicJson\/\" target=\"_blank\">DynamicJson<\/a>\u4e92\u63db\u306e\u9ad8\u901f\u306aJSON\u30d1\u30fc\u30b6\u30fc\u3067\u3042\u308b\u3002DynamicJson\u3092\u4fbf\u5229\u306b\u5229\u7528\u3057\u3066\u3044\u308b\u304c\u3001\u51e6\u7406\u901f\u5ea6\u306b\u4e0d\u6e80\u304c\u3042\u308b\u306e\u3067\u9ad8\u901f\u306a\u3082\u306e\u3092\u958b\u767a\u3057\u305f\u3002<\/p>\n\n\n\n<p>DynaJson\u3067\u306fDynamicJson\u3068\u540c\u3058\u304f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bJSON\u6587\u5b57\u5217\u3092\u30d1\u30fc\u30ba\u3057\u305f\u7d50\u679c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092dynamic\u578b\u3067\u53d7\u3051\u53d6\u308a\u3001C#\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u540c\u69d8\u306b\u30e1\u30f3\u30d0\u30fc\u30a2\u30af\u30bb\u30b9\u6f14\u7b97\u5b50\u3067\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3002\u3053\u306e\u4ed5\u69d8\u306f\u3001\u5927\u304d\u306aJSON\u3092duck typing\u3067\u51e6\u7406\u3059\u308b\u3068\u304d\u306b\u4fbf\u5229\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<script type=\"text\/plain\" class=\"lang-csharp\">\ndynamic json = JsonObject.Parse(@\"{\n    \"\"foo\"\": \"\"json\"\",\n    \"\"nest\"\": {\"\"foobar\"\": true}\n}\");\nstring a1 = json.foo; \/\/ \"json\"\nbool a2 = json.nest.foobar; \/\/ true\n<\/script>\n\n\n\n<p>\u4ee5\u4e0b\u306bDynaJson\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\u3092\u793a\u3059\u3002\u7d041.7MB\u3042\u308bcitm_catalog.json<span id='easy-footnote-1-460' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote'><a href='https:\/\/roundwide.com\/ja\/nan-boxing-in-csharp\/#easy-footnote-bottom-1-460' title='&lt;a rel=&quot;noreferrer noopener&quot; href=&quot;https:\/\/github.com\/miloyip\/nativejson-benchmark&quot; target=&quot;_blank&quot;&gt;Native JSON Benchmark&lt;\/a&gt;\u304c\u4f7f\u7528\u3057\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u4e00\u3064\u3067\u3001\u3055\u307e\u3056\u307e\u306aJSON\u30d1\u30fc\u30b6\u30fc\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306b\u7528\u3044\u3089\u308c\u3066\u3044\u3066\u3044\u308b\u3002'><sup>1<\/sup><\/a><\/span>\u306e\u30d1\u30fc\u30ba\u306b\u639b\u304b\u3063\u305f\u6642\u9593\u3092<a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/neuecc\/Utf8Json\" target=\"_blank\">Utf8Json<\/a>, <a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/kevin-montrose\/Jil\" target=\"_blank\">Jil<\/a>, <a rel=\"noreferrer noopener\" href=\"https:\/\/www.newtonsoft.com\/json\" target=\"_blank\">Newtonsoft.Json<\/a>, DynamicJson\u3068\u6bd4\u8f03\u3057\u3066\u3044\u308b\u3002\u6e2c\u5b9a\u306fAzure D2ds_v4\u306eUbuntu 18.04\u4e0a\u3067.NET Core 3.1 \u3067\u884c\u3063\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/roundwide.com\/wp-content\/uploads\/2020\/12\/benchmakr-citm-parse.png\" alt=\"\" class=\"wp-image-483\"\/><\/figure>\n\n\n\n<p>\u7d50\u679c\u3092\u898b\u308b\u3068DynaJson\u304c\u3068\u3066\u3082\u901f\u3044\u3053\u3068\u304c\u308f\u304b\u308b\u3002\u3082\u3061\u308d\u3093\u3001\u3053\u306e\u3088\u3046\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u304c\u901f\u304f\u306a\u308b\u3088\u3046\u306b\u4f5c\u3063\u305f\u306e\u3067\u901f\u3044\u306e\u306f\u5f53\u305f\u308a\u524d\u3067\u3042\u308b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NaN Boxing\u306b\u3088\u308b\u6700\u9069\u5316<\/h2>\n\n\n\n<p>\u5927\u304d\u306aJSON\u30d5\u30a1\u30a4\u30eb\u3092\u30d1\u30fc\u30ba\u3059\u308b\u3068\u3001JSON\u306e\u5024\u3092\u8868\u3059\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5927\u91cf\u306b\u751f\u6210\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3002\u305d\u3053\u3067DynaJson\u3067\u306f\u3001\u3053\u308c\u309216\u30d0\u30a4\u30c8\u306e\u69cb\u9020\u4f53\u3067\u8868\u3057\u3066\u3044\u308b\u3002\u69cb\u9020\u4f53\u306e\u5927\u304d\u3055\u309216\u30d0\u30a4\u30c8\u306b\u6291\u3048\u308b\u3068\u3001\u30b3\u30d4\u30fc\u304c128bit SIMD\u547d\u4ee4\u306e\u30ed\u30fc\u30c9\u30fb\u30b9\u30c8\u30a2\u5404\u4e00\u56de\u3067\u3059\u3080\u306e\u3067\u901f\u304f\u306a\u308b\u3002<\/p>\n\n\n\n<script type=\"text\/plain\" class=\"lang-nasm\">\nvmovdqu   xmm0,xmmword ptr [rdi]\nvmovdqu   xmmword ptr [rsp+8],xmm0\n<\/script>\n\n\n\n<p>\u4ee5\u4e0b\u306b\u793a\u3057\u305f\u306e\u304c\u305d\u306e\u69cb\u9020\u4f53\u3067\u3042\u308b\u3002Explicit\u30ec\u30a4\u30a2\u30a6\u30c8\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u91cd\u306d\u306616\u30d0\u30a4\u30c8\u306b\u7573\u3093\u3067\u3044\u308b\u3002<code>String<\/code>, <code>Array<\/code>, <code>Dictionary<\/code>\u306b\u3064\u3044\u3066\u306f\u3001<code>Type<\/code>\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u306b\u57fa\u3065\u304f\u6392\u4ed6\u5229\u7528\u306a\u306e\u3067\u91cd\u306d\u3066\u3082\u554f\u984c\u306a\u3044\u3002\u554f\u984c\u306fdouble\u306e<code>Number<\/code>\u306e\u4e0a\u4f4d4\u30d0\u30a4\u30c8\u306benum\u578b\u306e<code>Type<\/code>\u3092\u91cd\u306d\u3066\u3044\u308b\u3053\u3068\u3060\u3002\u3053\u3093\u306a\u3053\u3068\u3092\u3057\u305f\u3089<code>Number<\/code>\u304c\u58ca\u308c\u3066\u3057\u307e\u308f\u306a\u3044\u306e\u304b\u3002<\/p>\n\n\n\n<script type=\"text\/plain\" class=\"lang-csharp\">\n[StructLayout(LayoutKind.Explicit)]\ninternal struct InternalObject\n{\n    [FieldOffset(4)] public JsonType Type;\n    [FieldOffset(0)] public double Number;\n    [FieldOffset(8)] public string String;\n    [FieldOffset(8)] public JsonArray Array;\n    [FieldOffset(8)] public JsonDictionary Dictionary;\n}\n<\/script>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/roundwide.com\/wp-content\/uploads\/2020\/12\/InternalObject-layout.png\" alt=\"\" class=\"wp-image-505\"\/><\/figure>\n\n\n\n<p>\u3053\u308c\u3092\u58ca\u3055\u306a\u3044\u3088\u3046\u306b\u5b9f\u73fe\u3059\u308b\u306e\u304cNaN Boxing\u3067\u3042\u308b\u3002NaN\u306f\u6d6e\u52d5\u5c0f\u6570\u70b9\u6f14\u7b97\u306b\u304a\u3051\u308b\u30bc\u30ed\u306e\u30bc\u30ed\u9664\u7b97\u3084\u3001\u8ca0\u306e\u5e73\u65b9\u6839\u306a\u3069\u3067\u751f\u3058\u308b\u5024\u3067\u3042\u308b\u3002IEEE 754\u3067\u5b9a\u3081\u3089\u308c\u305fNaN\u306e\u30d0\u30a4\u30ca\u30ea\u8868\u73fe\u306e\u4e00\u3064\u306f0xfff8000000000000\u3067\u3042\u308b<span id='easy-footnote-2-460' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote'><a href='https:\/\/roundwide.com\/ja\/nan-boxing-in-csharp\/#easy-footnote-bottom-2-460' title='\u305d\u308c\u4ee5\u5916\u306f&lt;a rel=&quot;noreferrer noopener&quot; href=&quot;https:\/\/ja.wikipedia.org\/wiki\/NaN#%E3%82%A8%E3%83%B3%E3%82%B3%E3%83%BC%E3%83%89&quot; target=&quot;_blank&quot;&gt;Wikipedia&lt;\/a&gt;\u3092\u53c2\u7167\u3057\u3066\u307b\u3057\u3044'><sup>2<\/sup><\/a><\/span>\u3002\u3053\u306e\u3046\u3061\u4e0b\u4f4d51\u30d3\u30c3\u30c8\u306f\u4efb\u610f\u306e\u5024\u3067\u3088\u3044\u306e\u3067\u3001NaN Boxing\u306f\u3053\u3053\u306b\u30c7\u30fc\u30bf\u3092\u8a70\u3081\u8fbc\u3080\u3002<\/p>\n\n\n\n<p>enum\u578b\u306e<code>JsonType<\/code>\u306e\u5b9a\u7fa9\u3092\u4ee5\u4e0b\u306b\u793a\u3059\u3002\u307e\u305anull, true, false\u3092<code>JsonType<\/code>\u306b\u62bc\u3057\u8fbc\u3093\u3060\u4e0a\u3067\u3001\u5404\u30e1\u30f3\u30d0\u30fc\u306bNaN\u306e\u4e0a\u4f4d\u30d0\u30a4\u30c8\u3068\u3057\u3066\u6b63\u3057\u3044\u5024\u3092\u5272\u308a\u5f53\u3066\u3066\u3044\u308b\u3002\u3053\u308c\u3089\u306f\u3001\u901a\u5e38\u306edouble\u306e\u4e0a\u4f4d4\u30d0\u30a4\u30c8\u3068\u306f\u885d\u7a81\u3057\u306a\u3044\u5024\u3067\u3042\u308a\u3001\u4e0b\u4f4d4\u30d0\u30a4\u30c8\u304c\u4f55\u3067\u3042\u308cdouble\u3068\u3057\u3066\u6b63\u5f53\u306a\u5024\u306b\u306a\u308b\u3002<\/p>\n\n\n\n<script type=\"text\/plain\" class=\"lang-csharp\">\nenum JsonType : uint\n{\n    Null = 0xfff80001,\n    True = 0xfff80002,\n    False = 0xfff80003,\n    String = 0xfff80004,\n    Array = 0xfff80005,\n    Object = 0xfff80006\n}\n<\/script>\n\n\n\n<p>\u3053\u306e<code>JsonType<\/code>\u306e\u4f7f\u7528\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3059\u3002<code>ToValue<\/code>\u306f<code>InternalObject<\/code>\u304c\u8868\u3059\u5024\u3092\u53d6\u308a\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b\u3002<code>obj.Type<\/code>\u304c<code>JsonType.Null<\/code>\u304b\u3089<code>JsonType.Object<\/code>\u306e\u3044\u305a\u308c\u3067\u3082\u306a\u3044\u5834\u5408\u306f\u3001\u901a\u5e38\u306edouble\u306e\u4e0a\u4f4d4\u30d0\u30a4\u30c8\u306a\u306e\u3067<code>obj.Number<\/code>\u3092\u8fd4\u3057\u3066\u3044\u308b\u3002\u3053\u308c\u3067<code>Number<\/code>\u3068<code>Type<\/code>\u304c\u4e0a\u4f4d4\u30d0\u30a4\u30c8\u3067\u5171\u5b58\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<script type=\"text\/plain\" class=\"language-csharp\">\nobject ToValue(InternalObject obj)\n{\n    switch (obj.Type)\n    {\n        case JsonType.Null:\n            return null;\n        case JsonType.True:\n            return true;\n        case JsonType.False:\n            return false;\n        case JsonType.String:\n            return obj.String;\n        case JsonType.Array:\n        case JsonType.Object:\n            return new JsonObject(obj);\n        default:\n            return obj.Number;\n    }\n}\n<\/script>\n\n\n\n<p>NaN Boxing\u306e\u52b9\u679c\u3092\u6e2c\u5b9a\u3057\u305f\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u4ee5\u4e0b\u306b\u793a\u3059\u3002Class\u306f<code>InternalObject<\/code>\u3092\u30af\u30e9\u30b9\u306b\u3057\u305f\u5834\u5408\u3001Struct\u306fNaN Boxing\u3092\u7528\u3044\u305a\u306b20\u30d0\u30a4\u30c8(8+8+4)\u306e\u69cb\u9020\u4f53\u306b\u3057\u305f\u5834\u5408\u3001NaN Boxing\u306fNaN Boxing\u306716\u30d0\u30a4\u30c8\u306b\u3057\u305f\u5834\u5408\u3067\u3042\u308b\u3002 20\u30d0\u30a4\u30c8\u306e\u69cb\u9020\u4f53\u306b\u3059\u308b\u3060\u3051\u306720%\u306e\u6027\u80fd\u6539\u5584\u304c\u3042\u308b\u304c\u3001NaN Boxing\u3067\u3055\u3089\u306b6.8%\u3082\u6539\u5584\u3059\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"767\" height=\"344\" src=\"https:\/\/roundwide.com\/wp-content\/uploads\/2020\/12\/benchmark-nan-boxing.png\" alt=\"\" class=\"wp-image-486\" srcset=\"https:\/\/roundwide.com\/wp-content\/uploads\/2020\/12\/benchmark-nan-boxing.png 767w, https:\/\/roundwide.com\/wp-content\/uploads\/2020\/12\/benchmark-nan-boxing-300x135.png 300w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308bNaN Boxing<\/h2>\n\n\n\n<p>NaN Boxing\u306f\u3001Mozilla\u306eSpiderMonkey\u3084WebKit\u306eJavaScriptCore\u3068\u3044\u3063\u305f\u3001JavaScript\u306e\u51e6\u7406\u7cfb\u3067<a rel=\"noreferrer noopener\" href=\"https:\/\/brionv.com\/log\/2018\/05\/17\/javascript-engine-internals-nan-boxing\/\" target=\"_blank\">\u4f7f\u308f\u308c\u3066\u3044\u308b<\/a>\u3002\u305f\u3060\u3057\u3001Google\u306eV8\u3067\u306f<a rel=\"noreferrer noopener\" href=\"https:\/\/wingolog.org\/archives\/2011\/05\/18\/value-representation-in-javascript-implementations\" target=\"_blank\">\u4f7f\u308f\u308c\u3066\u306a\u3044<\/a>\u3002\u307b\u304b\u306b\u306f<a href=\"https:\/\/luajit.org\/\">LuaJIT<\/a>\u3084<a href=\"https:\/\/github.com\/mruby\/mruby\">mruby<\/a>\u3068\u3044\u3063\u305f\u4f7f\u7528\u4f8b\u304c\u3042\u308b\u3002\u3053\u308c\u3089\u306e\u4f7f\u7528\u4f8b\u3067\u306f\u3001\u30dd\u30a4\u30f3\u30bf\u30fc\u3082double\u306b\u91cd\u306d\u30668\u30d0\u30a4\u30c8\u306b\u53ce\u3081\u3066\u3044\u308b\u3002C#\u3067\u306fmanaged pointer\u3092double\u306b\u91cd\u306d\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u306e\u3067\u3001<code>InternalObject<\/code>\u30928\u30d0\u30a4\u30c8\u306b\u3059\u308b\u3053\u3068\u306f\u6b8b\u5ff5\u306a\u304c\u3089\u3067\u304d\u306a\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4ee5\u524dC# Tokyo\u3067\u884c\u3063\u305f\u30d7\u30ec\u30bc\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u5143\u306b\u3001JSON\u30d1\u30fc\u30b6\u30fcDynaJson\u3067\u7528\u3044\u3066\u3044\u308bNaN Boxing\u3068\u3044\u3046\u6700\u9069\u5316\u6280\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u3002\u3053\u306e\u8a18\u4e8b\u306fC# Advent Calendar 202 &hellip; <a href=\"https:\/\/roundwide.com\/ja\/nan-boxing-in-csharp\/\" class=\"more-link\"><span class=\"screen-reader-text\">\"C#\u3067NaN Boxing\" \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"ja","_original_post":"https:\/\/roundwide.com\/?p=460","footnotes":""},"categories":[10,13],"tags":[],"class_list":["post-460","post","type-post","status-publish","format-standard","hentry","category-csharp","category-optimization","ja"],"_links":{"self":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts\/460","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/comments?post=460"}],"version-history":[{"count":40,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts\/460\/revisions"}],"predecessor-version":[{"id":554,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/posts\/460\/revisions\/554"}],"wp:attachment":[{"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/media?parent=460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/categories?post=460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/roundwide.com\/wp-json\/wp\/v2\/tags?post=460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}