{"id":22855,"date":"2024-02-15T15:16:47","date_gmt":"2024-02-15T06:16:47","guid":{"rendered":"https:\/\/labs.gree.jp\/blog\/?p=22855"},"modified":"2024-02-15T16:05:36","modified_gmt":"2024-02-15T07:05:36","slug":"bpftrace%e3%81%a7c%e3%81%ae%e3%82%a2%e3%83%97%e3%83%aa%e3%82%b1%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3%e3%82%92%e3%83%88%e3%83%ac%e3%83%bc%e3%82%b9","status":"publish","type":"post","link":"https:\/\/labs.gree.jp\/blog\/2024\/02\/22855\/","title":{"rendered":"bpftrace\u3067C++\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u30c8\u30ec\u30fc\u30b9"},"content":{"rendered":"<h1>\u52d5\u6a5f\u3068\u6982\u8981<\/h1>\n<p>eBPF\u30d7\u30ed\u30b0\u30e9\u30e0\u306fLinux\u30ab\u30fc\u30cd\u30eb\u306e\u3088\u3046\u306aC\u8a00\u8a9e\u3067\u66f8\u304b\u308c\u305f\u95a2\u6570\u306e\u30c8\u30ec\u30fc\u30b9\u3092\u5f97\u610f\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001C++\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u7279\u6709\u306e\u30c8\u30ec\u30fc\u30b9\u6280\u6cd5\u304c\u3042\u307e\u308a\u516c\u958b\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u4eca\u56de\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u3067\u306feBPF\u3092\u4f7f\u3063\u305f\u30c8\u30ec\u30fc\u30b7\u30f3\u30b0\u3092\u63d0\u4f9b\u3059\u308b\u30c4\u30fc\u30eb\u3067\u3042\u308bbpftrace\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30fc\u30d0\u30fc\u306e\u79fb\u8a2d\u3092\u691c\u8a0e\u3059\u308b\u305f\u3081\u306b\u306f\u3069\u306e\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u3069\u306e\u7a0b\u5ea6\u306e\u30a2\u30af\u30bb\u30b9\u304c\u3042\u308b\u306e\u304b\u8abf\u3079\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30b0\u30ea\u30fc\u3067\u306fC++\u3067\u66f8\u304b\u308c\u305f<a href=\"https:\/\/github.com\/gree\/flare\">flare<\/a>\u3068\u3044\u3046memcached\u4e92\u63db\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u52d5\u3044\u3066\u304a\u308a\u3001flare\u3078\u306e\u30a2\u30af\u30bb\u30b9\u89e3\u6790\u306bbpftrace\u3092\u5229\u7528\u3057\u307e\u3057\u305f\u3002\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u306f\u4e00\u56de\u306e\u63a5\u7d9a\u3067\u4f55\u5ea6\u3082flare\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u308b\u305f\u3081\u3001\u63a5\u7d9a\u6570\u30d9\u30fc\u30b9\u306e\u8a08\u6e2c\u3067\u306f\u5b9f\u969b\u306e\u5229\u7528\u983b\u5ea6\u304c\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u4eca\u56debpftrace\u3092\u7528\u3044\u3066\u3069\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u3069\u3093\u306a\u7a2e\u985e\u306e\u30a2\u30af\u30bb\u30b9\u3092\u4f55\u56de\u30ea\u30af\u30a8\u30b9\u30c8\u3057\u3066\u3044\u308b\u304b\u8abf\u67fb\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u30c8\u30ec\u30fc\u30b9\u306b\u304a\u3051\u308bC++\u7279\u6709\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3057\u305f\u5f8c\u3001flare\u306e\u89e3\u6790\u306b\u4f7f\u3063\u305fbpftrace\u306e\u30b3\u30fc\u30c9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h1>C++\u7279\u6709\u306e\u554f\u984c<\/h1>\n<p>\u30c8\u30ec\u30fc\u30b9\u306b\u304a\u3051\u308bC++\u7279\u6709\u306e\u554f\u984c\u30925\u3064\u307b\u3069\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u540d\u524d\u4fee\u98fe(name mangling)<\/li>\n<li>std::string<\/li>\n<li>\u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u3068\u30e1\u30f3\u30d0\u5909\u6570<\/li>\n<li>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf<\/li>\n<li>\u53c2\u7167<\/li>\n<\/ul>\n<p>bpftrace\u304b\u3089C++\u306e\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306fC\u8a00\u8a9e\u306e\u30eb\u30fc\u30eb\u3067\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001C++\u304b\u3089C\u8a00\u8a9e\u3078\u306e\u5909\u63db\u304c\u30c8\u30ec\u30fc\u30b9\u3092\u56f0\u96e3\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306fC++\u306e\u30af\u30e9\u30b9\u3092C\u8a00\u8a9e\u306e\u69cb\u9020\u4f53\u306b\u3001\u53c2\u7167\u3092\u30dd\u30a4\u30f3\u30bf\u306b\u7ffb\u8a33\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h4>\u540d\u524d\u4fee\u98fe(name mangling)<\/h4>\n<p>C++\u306e\u95a2\u6570\u540d\u306f\u540d\u524d\u4fee\u98fe\uff08\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\uff09\u3055\u308c\u3066\u304a\u308a\u3001\u540d\u524d\u4fee\u98fe\u3055\u308c\u305f\u30b7\u30f3\u30dc\u30eb\u3092\u4f7f\u3063\u3066bpftrace\u306b\u6e21\u3057\u3066\u30c8\u30ec\u30fc\u30b9\u3057\u307e\u3059\u3002<\/p>\n<p>\u540d\u524d\u4fee\u98fe\u306f<code>int DataA::getData()<\/code>\u3068\u3044\u3063\u305fC++\u306b\u304a\u3051\u308b\u30af\u30e9\u30b9<code>DataA<\/code>\u306e\u95a2\u6570<code>getData<\/code>\u306b\u5bfe\u3057\u3066\u3001<code>_ZN5DataA7getDataEv<\/code>\u306e\u3088\u3046\u306a\u30b7\u30f3\u30dc\u30eb\u3092\u5272\u308a\u5f53\u3066\u308b\u51e6\u7406\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u9006\u306e\u51e6\u7406\u306f\u30c7\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p><code>bpftrace -l<\/code>\u30b3\u30de\u30f3\u30c9\u3067\u30c8\u30ec\u30fc\u30b9\u3067\u304d\u308b\u95a2\u6570\u540d\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u305d\u3053\u3067\u306f\u540d\u524d\u4fee\u98fe\u3055\u308c\u305f\u95a2\u6570\u540d\u304c\u51fa\u3066\u304d\u307e\u3059\u3002C\u8a00\u8a9e\u304b\u3089C++\u306e\u30b7\u30f3\u30dc\u30eb\u3092\u53c2\u7167\u3059\u308b\u306a\u3089\u540d\u524d\u4fee\u98fe\u3055\u308c\u305f\u95a2\u6570\u540d\u3092\u4f7f\u3044\u307e\u3059\u3002\u4e0b\u8a18\u306b<code>\/usr\/bin\/flared<\/code>\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5bfe\u8c61\u306b\u8abf\u3079\u305f\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:sh decode:true\">$ sudo bpftrace -l 'uprobe:\/usr\/bin\/flared:*' |grep flare|head\nuprobe:\/usr\/bin\/flared:_ZNK5boost10shared_ptrIN4gree5flare6threadEEptEv.isra.0.part.0\nuprobe:\/usr\/bin\/flared:_ZNK5boost10shared_ptrIN4gree5flare19cluster_replicationEEptEv.isra.0.part.0\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare15sa_usr1_handlerEi.cold\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare15sa_term_handlerEi.cold\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6flared8shutdownEv.cold\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6flared16on_storage_errorEv.cold\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6flared19_set_resource_limitEv.cold\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6flared19_set_signal_handlerEv.cold\nuprobe:\/usr\/bin\/flared:main.cold\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6flared3runEv.cold<\/pre>\n<p><code>c++filt<\/code>\u30b3\u30de\u30f3\u30c9\u3067\u30c7\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u3066\u95a2\u6570\u306e\u540d\u524d\u3084\u5f15\u6570\u3092\u898b\u3084\u3059\u304f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u4e0b\u8a18\u5b9f\u884c\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002bpftrace\u306f\u540d\u524d\u4fee\u98fe\u3057\u305f\u30b7\u30f3\u30dc\u30eb\u3082\u30c7\u30de\u30f3\u30b0\u30ea\u30f3\u30b0\u3057\u305f\u30b7\u30f3\u30dc\u30eb\u3082\u6271\u3048\u307e\u3059\u3002\u30c8\u30ec\u30fc\u30b9\u3057\u305f\u3044\u30b7\u30f3\u30dc\u30eb\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u30c7\u30d0\u30c3\u30b0\u30b7\u30f3\u30dc\u30eb\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<a href=\"https:\/\/wiki.ubuntu.com\/Debug%20Symbol%20Packages\">ubuntu\u306e\u5834\u5408\u306f\u3053\u3061\u3089\u3092\u53c2\u7167\u304f\u3060\u3055\u3044\u3002<\/a><\/p>\n<p>\u4f59\u8ac7\u3067\u3059\u304c\u3001<a href=\"https:\/\/gcc.gnu.org\/onlinedocs\/gcc\/Common-Function-Attributes.html\"><code>.cold<\/code><\/a>\u3068\u3044\u3046\u306e\u306f\u5b9f\u884c\u3055\u308c\u308b\u983b\u5ea6\u304c\u4f4e\u3044\u95a2\u6570\u306b\u3064\u3051\u3089\u308c\u308bGCC\u306e\u5c5e\u6027\u3060\u305d\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"lang:sh decode:true\">$ sudo bpftrace -l 'uprobe:\/usr\/bin\/flared:*' |grep flare|head | c++filt\nuprobe:\/usr\/bin\/flared:boost::shared_ptr&lt;gree::flare::thread&gt;::operator-&gt;() const [clone .isra.0] [clone .part.0]\nuprobe:\/usr\/bin\/flared:boost::shared_ptr&lt;gree::flare::cluster_replication&gt;::operator-&gt;() const [clone .isra.0] [clone .part.0]\nuprobe:\/usr\/bin\/flared:gree::flare::sa_usr1_handler(int) [clone .cold]\nuprobe:\/usr\/bin\/flared:gree::flare::sa_term_handler(int) [clone .cold]\nuprobe:\/usr\/bin\/flared:gree::flare::flared::shutdown() [clone .cold]\nuprobe:\/usr\/bin\/flared:gree::flare::flared::on_storage_error() [clone .cold]\nuprobe:\/usr\/bin\/flared:gree::flare::flared::_set_resource_limit() [clone .cold]\nuprobe:\/usr\/bin\/flared:gree::flare::flared::_set_signal_handler() [clone .cold]\nuprobe:\/usr\/bin\/flared:main.cold\nuprobe:\/usr\/bin\/flared:gree::flare::flared::run() [clone .cold]<\/pre>\n<h4>std::string<\/h4>\n<p>\u30c8\u30ec\u30fc\u30b9\u306b\u304a\u3044\u3066\u6587\u5b57\u5217\u306e\u51fa\u529b\u306f\u74b0\u5883\u306b\u3088\u3063\u3066\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u7570\u306a\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002C++\u306e\u6587\u5b57\u5217\u3067\u3042\u308bstd::string\u306bC\u8a00\u8a9e\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f<code>std::string<\/code>\u306e\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u3092\u77e5\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30e1\u30e2\u30ea\u30ec\u30a4\u30a2\u30a6\u30c8\u306f<a href=\"https:\/\/rrmprogramming.com\/article\/small-string-optimization-sso-in-c\/\">Small String Optimization (SSO)<\/a> \u306b\u3088\u308b\u77ed\u3044\u6587\u5b57\u5217\u306e\u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066\u304c\u3042\u308b\u304b\u306a\u3044\u304b\u3067\u5909\u308f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>GCC4\u307e\u3067\u306f\u3001<code>std::string<\/code>\u306f\u6b21\u306e\u3088\u3046\u306a\u69cb\u9020\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c decode:true\">struct string{\n  char* buffer;\u3000 \/\/ \u6587\u5b57\u5217\u306e\u30d0\u30c3\u30d5\u30a1\n  size_t size;\u3000\/\/ \u6587\u5b57\u5217\u306e\u9577\u3055\n  size_t capacity; \/\/ buffer\u306e\u30ad\u30e3\u30d1\u30b7\u30c6\u30a3\n}<\/pre>\n<p>SSO\u304c\u3042\u308b\u3068GCC9\u3067\u306f\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u3084\u74b0\u5883\u306b\u3088\u308a\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002GCC\u306e\u5834\u5408\u306f<code>basic_string.h<\/code>\u306e\u30d8\u30c3\u30c0\u30fc\u3092\u898b\u3066\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"lang:c decode:true\">struct string_with_sso{\n  char* buffer;\u3000 \/\/ \u6587\u5b57\u5217\u306e\u30d0\u30c3\u30d5\u30a1\n  size_t size;\u3000\/\/ \u6587\u5b57\u5217\u306e\u9577\u3055\n  char sso_buffer[16];\n}<\/pre>\n<p>GCC\u3067\u306f\u3044\u305a\u308c\u306b\u3057\u3066\u3082\u6700\u521d\u306b\u6587\u5b57\u5217\u306e\u30d0\u30c3\u30d5\u30a1\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u304c\u3042\u308a\u3001bpftrace\u306f\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306aC\u8a00\u8a9e\u306e\u69cb\u9020\u4f53\u3092\u5b9a\u7fa9\u3059\u308c\u3070<code>buffer<\/code>\u304b\u3089\u76f4\u63a5\u6587\u5b57\u5217\u3078\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c decode:true\">struct string{\n  char* buffer;\n  size_t size;\u3000\/\/ \u6587\u5b57\u5217\u306e\u9577\u3055 \n  char dummy[16]; \/\/ \u74b0\u5883\u306b\u5408\u308f\u305b\u3066\u7a74\u57cb\u3081\u3002\n}<\/pre>\n<h4>\u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u3068\u30e1\u30f3\u30d0\u5909\u6570<\/h4>\n<p>\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306b\u306f\u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb\u306f\u4eee\u60f3\u95a2\u6570\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3092\u307e\u3068\u3081\u305f\u30c6\u30fc\u30d6\u30eb\u3067\u3001\u591a\u614b\u6027(\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0) \u3092\u5b9f\u73fe\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<p>\u4eee\u60f3\u95a2\u6570\u304c\u3042\u308b\u5834\u5408\u306f\u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u304c\u3042\u308a\u307e\u3059\u3002\u6b21\u306e\u3088\u3046\u306b\u4eee\u60f3\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b<code>DataA<\/code>\u3068\u4eee\u60f3\u30c6\u30fc\u30d6\u30eb\u304c\u306a\u3044<code>DataB<\/code>\u306e\u30af\u30e9\u30b9\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c++ decode:true\">\/\/ \u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u306e\u3042\u308bclass DataA\nclass DataA {\npublic:\n  virtual int get();\n  int getData();\n  int data;\n};\n\/\/ \u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u306e\u306a\u3044class DataB\nclass DataB {\n  int getData(); \n  int data;\n};<\/pre>\n<p>bpftrace\u3067\u306f\u6b21\u306e\u3088\u3046\u306aC\u8a00\u8a9e\u306e\u69cb\u9020\u4f53\u306b\u306a\u308a\u307e\u3059\u3002\u4eee\u60f3\u95a2\u6570\u304c\u3042\u308b<code>DataA<\/code>\u306f\u3001\u306f\u3058\u3081\u306bvtable\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u304c\u3042\u3063\u3066\u3001\u305d\u306e\u6b21\u306b\u30e1\u30f3\u30d0\u5909\u6570\u304c\u4e26\u3073\u307e\u3059\u3002\u4eee\u60f3\u95a2\u6570\u304c\u306a\u3044<code>DataB<\/code>\u306f\u3001\u306f\u3058\u3081\u306b\u30e1\u30f3\u30d0\u5909\u6570\u304c\u4e26\u3073\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c decode:true\">\/\/ \u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u306e\u3042\u308bclass DataA \nstruct DataA{\n  void* vtable; \/\/ \u3053\u3053\u304cvtable\n  int data;\n};\n\/\/ \u4eee\u60f3\u95a2\u6570\u30c6\u30fc\u30d6\u30eb(vtable)\u306e\u306a\u3044class DataB \nstruct DataB{\n  int data;\n};<\/pre>\n<p>\u6b21\u306bbpftrace\u3067<code>getData<\/code>\u3092\u30c8\u30ec\u30fc\u30b9\u3057\u3066\u4e2d\u8eab\u306e<code>data<\/code>\u3092\u53d6\u308a\u51fa\u3059\u30b3\u30fc\u30c9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u7b2c\u4e00\u5f15\u6570(<code>arg0<\/code>)\u306f\u30af\u30e9\u30b9\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u306b\u306a\u3063\u3066\u304a\u308a\u3001C++\u3067\u306f<code>this<\/code>\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u540c\u3058\u3082\u306e\u3067\u3059\u3002\u30e1\u30f3\u30d0\u95a2\u6570\u306b\u5f15\u6570\u304c\u3042\u308c\u3070\u7b2c\u4e8c\u5f15\u6570(<code>arg1<\/code>)\u4ee5\u964d\u306e\u3082\u306e\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c decode:true\">struct DataA{\n  void* vtable;\n  int data;\n}\nstruct DataB{\n  int data;\n}\n\n\/\/ DataA\u306e\u30e1\u30f3\u30d0\u95a2\u6570getData\u3078\u306e\u30d7\u30ed\u30fc\u30d6\u8a2d\u5b9a\n\/\/ _ZN5DataA7getDataEv\u306fDataA\u306e\u30e1\u30f3\u30d0\u95a2\u6570getData\u3092\u540d\u524d\u4fee\u98fe\u3057\u305f\u3082\u306e\u3002\nuprove:\u30d7\u30ed\u30b0\u30e9\u30e0\u3078\u306e\u30d1\u30b9:_ZN5DataA7getDataEv{\n  \/\/ arg0\u306fc++\u306ethis\u30dd\u30a4\u30f3\u30bf\u3068\u540c\u3058\u3067\u30af\u30e9\u30b9\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002\n  printf(\"DataA-&gt;data: %d\\n\",((struct DataA*)arg0)-&gt;data);\n}\n\n\/\/ DataB\u306e\u30e1\u30f3\u30d0\u95a2\u6570getData\u3078\u306e\u30d7\u30ed\u30fc\u30d6\u8a2d\u5b9a \n\/\/ _ZN5DataB7getDataEv\u306fDataB\u306e\u30e1\u30f3\u30d0\u95a2\u6570getData\u3092\u540d\u524d\u4fee\u98fe\u3057\u305f\u3082\u306e\u3002 \nuprove:\u30d7\u30ed\u30b0\u30e9\u30e0\u3078\u306e\u30d1\u30b9:_ZN5DataB7getDataEv{\n  printf(\"DataB-&gt;data: %d\\n\",((struct DataB*)arg0)-&gt;data); \n}\n<\/pre>\n<h4>\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf<\/h4>\n<p><a href=\"https:\/\/github.com\/steinwurf\/boost\/blob\/master\/boost\/smart_ptr\/shared_ptr.hpp#L818-L819\">boost\u306eshared_ptr\u306e\u5834\u5408<\/a>\u3001\u30c7\u30fc\u30bf\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u53c2\u7167\u30ab\u30a6\u30f3\u30c8\u304b\u3089\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c decode:true\">\/\/ C\u8a00\u8a9e\u3067\u306e\u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u69cb\u9020\u4f53\nstruct shared_pr{\n  void* ptr;\n  int count;\n}<\/pre>\n<h4>\u53c2\u7167<\/h4>\n<p>C++\u306e\u53c2\u7167\u306fC\u8a00\u8a9e\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u540c\u3058\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002\u4e0b\u8a18\u306b\u4e00\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<code>DataA&amp;<\/code>\u306e\u53c2\u7167\u3092<code>struct DataA*<\/code>\u306e\u30dd\u30a4\u30f3\u30bf\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c++ decode:true\">\/\/ C++\u3067\u306e\u95a2\u6570\u306e\u5ba3\u8a00\nint getData(DataA&amp; dat){}\n\n\/\/ C\u8a00\u8a9e\u3067\u306e\u95a2\u6570\u306e\u5ba3\u8a00\nint getData(struct DataA* dat){ }\n<\/pre>\n<h1>flare\u306e\u89e3\u6790<\/h1>\n<p>\u4e0a\u8a18\u306e\u77e5\u898b\u3092\u3082\u3068\u306bflare\u3078\u30a2\u30af\u30bb\u30b9\u306e\u3042\u308bWeb\u30b5\u30fc\u30d0\u30fc\u3092bpftrace\u3092\u7528\u3044\u3066\u51fa\u529b\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308a\u3001\u89e3\u6790\u3092\u5b9f\u65bd\u3057\u307e\u3057\u305f\u3002flare\u3078\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u308bWeb\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u7a2e\u985e\uff08get,set,delete,incr\uff09\u3054\u3068\u306b\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>flare\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8aad\u307f\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u51e6\u7406\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u30d1\u30fc\u30b9\u304c\u5b8c\u4e86\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u8fd4\u3059\u51e6\u7406\u3092\u3059\u308b<code>_run_server<\/code>\u95a2\u6570\u306buprobe\u3092\u8a2d\u7f6e\u3057\u307e\u3059\u3002\u305d\u306e\u4e2d\u3067\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3001 <code>sockaddr_in<\/code>\u69cb\u9020\u4f53\u304b\u3089\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3057\u3066\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c decode:true\">\/\/ bpftrace\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u30b5\u30f3\u30d7\u30eb\n\/\/ \/usr\/include\/netinet\/in.h\u304b\u3089\u6301\u3063\u3066\u304d\u3066\u3044\u307e\u3059\u3002\nstruct sockaddr_in {\n  u_char  sin_len;\n  u_char  sin_family;\n  u_short sin_port;\n  u_int32_t sin_addr;\n  char    sin_zero[8];\n}\n\n\/\/ connection\u30af\u30e9\u30b9\u306f_addr_inet\u3068\u3044\u3046\u30e1\u30f3\u30d0\u30fc\u306bIP\u30a2\u30c9\u30ec\u30b9\u3092\u6301\u3063\u3066\u3044\u308b\u3002\nstruct connection {\n  int* vtable;\n  u_short _addr_family;\n  struct sockaddr_in _addr_inet;\n}\n\nstruct smart_ptr {\n  struct connection *ptr;\n\u3000\u3000\u3000\u3000\/\/ \u30b9\u30de\u30fc\u30c8\u30dd\u30a4\u30f3\u30bf\u306e\u53c2\u7167\u30ab\u30a6\u30f3\u30c8\u306f\u53c2\u7167\u3057\u306a\u3044\u306e\u3067\u7701\u7565\u3002\n}\n\n\/\/ \u30c8\u30ec\u30fc\u30b9\u3059\u308b\u95a2\u6570\u306e\u30af\u30e9\u30b9\u306e\u69cb\u9020\u4f53\n\/\/ \u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u3068\u306e\u63a5\u7d9a\u60c5\u5831\u3092connection\u3067\u7ba1\u7406\u3057\u3066\u3044\u308b\u3002\nstruct op{\n  int* vtable;\n  struct smart_ptr connection;\n\u3000\u3000\u3000\u3000\/\/ \u5f8c\u7d9a\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u306f\u4f7f\u308f\u306a\u3044\u306e\u3067\u7701\u7565\u3002\n}\n\n\/\/ \u30c8\u30ec\u30fc\u30b9\u3059\u308b\u95a2\u6570\u306e\u30ea\u30b9\u30c8\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6op_get11_run_serverEv,\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare6op_set11_run_serverEv,\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare7op_incr11_run_serverEv,\nuprobe:\/usr\/bin\/flared:_ZN4gree5flare9op_delete11_run_serverEv {\n  printf(\"%d %s %s\\n\",\n         nsecs,\n     probe,\n     ntop(\n          ((struct op*)arg0)-&gt;connection.ptr-&gt;_addr_inet.sin_addr\n          ));\n}<\/pre>\n<pre class=\"lang:sh decode:true\"># bpftrace\u306e\u5b9f\u884c\u4f8b\n# bpftrace\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u6e96\u5099\n$ cat &gt; flare-trace.bt\n# bpftrace\u3092\u5b9f\u884c\n$ sudo bpftrace .\/flare-trace.bt\n<\/pre>\n<h1>\u307e\u3068\u3081<\/h1>\n<ul>\n<li>bpftrace\u3067C++\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30c8\u30ec\u30fc\u30b9\u3057\u3066\u5f15\u6570\u306e\u4e2d\u8eab\u3084\u30e1\u30f3\u30d0\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306b\u3001C++\u8a00\u8a9e\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092C\u8a00\u8a9e\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u5909\u63db\u3059\u308b\u3084\u308a\u65b9\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/li>\n<li>\u30c8\u30ec\u30fc\u30b9\u306e\u9069\u7528\u4f8b\u3068\u3057\u3066\u30b0\u30ea\u30fc\u3067\u4f7f\u7528\u3057\u3066\u3044\u308bflare\u3078\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u308bWeb\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u30c8\u30ec\u30fc\u30b9\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u793a\u3057\u307e\u3057\u305f\u3002<\/li>\n<\/ul>\n<h1>\u53c2\u8003\u6587\u732e<\/h1>\n<ul>\n<li><a href=\"https:\/\/github.com\/bpftrace\/bpftrace\/blob\/master\/docs\/reference_guide.md\">https:\/\/github.com\/bpftrace\/bpftrace\/blob\/master\/docs\/reference_guide.md<\/a><\/li>\n<li><a href=\"https:\/\/qiita.com\/4_mio_11\/items\/aa71f18b24ab55e4cb3d\">https:\/\/qiita.com\/4_mio_11\/items\/aa71f18b24ab55e4cb3d<\/a><\/li>\n<li><a href=\"https:\/\/rrmprogramming.com\/article\/small-string-optimization-sso-in-c\/\">https:\/\/rrmprogramming.com\/article\/small-string-optimization-sso-in-c\/<\/a><\/li>\n<li><a href=\"https:\/\/joellaity.com\/2020\/01\/31\/string.html\">https:\/\/joellaity.com\/2020\/01\/31\/string.html<\/a><\/li>\n<li><a href=\"https:\/\/wiki.ubuntu.com\/Debug%20Symbol%20Packages\">https:\/\/wiki.ubuntu.com\/Debug%20Symbol%20Packages<\/a><\/li>\n<li><a href=\"https:\/\/gcc.gnu.org\/onlinedocs\/gcc\/Common-Function-Attributes.html\">https:\/\/gcc.gnu.org\/onlinedocs\/gcc\/Common-Function-Attributes.html<\/a><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u52d5\u6a5f\u3068\u6982\u8981 eBPF\u30d7\u30ed\u30b0\u30e9\u30e0\u306fLinux\u30ab\u30fc\u30cd\u30eb\u306e\u3088\u3046\u306aC\u8a00\u8a9e\u3067\u66f8\u304b\u308c\u305f\u95a2\u6570\u306e\u30c8\u30ec\u30fc\u30b9\u3092\u5f97\u610f\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001C++\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u7279\u6709\u306e\u30c8\u30ec\u30fc\u30b9\u6280\u6cd5\u304c\u3042\u307e\u308a\u516c\u958b\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u4eca\u56de\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u3067\u306feB [&hellip;]<\/p>\n","protected":false},"author":134,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9],"tags":[98,223],"class_list":["post-22855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-info","tag-c","tag-ebpf"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts\/22855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/users\/134"}],"replies":[{"embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/comments?post=22855"}],"version-history":[{"count":51,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts\/22855\/revisions"}],"predecessor-version":[{"id":22937,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/posts\/22855\/revisions\/22937"}],"wp:attachment":[{"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/media?parent=22855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/categories?post=22855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/labs.gree.jp\/blog\/wp-json\/wp\/v2\/tags?post=22855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}