{"id":1320,"date":"2018-06-03T00:30:39","date_gmt":"2018-06-02T16:30:39","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1320"},"modified":"2018-06-03T00:30:39","modified_gmt":"2018-06-02T16:30:39","slug":"gdb-%e5%a6%82%e4%bd%95%e5%b7%a5%e4%bd%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1320","title":{"rendered":"gdb \u5982\u4f55\u5de5\u4f5c\uff1f"},"content":{"rendered":"

\u5927\u5bb6\u597d\uff01\u4eca\u5929\uff0c\u6211\u5f00\u59cb\u8fdb\u884c\u6211\u7684\u00a0ruby \u5806\u6808\u8ddf\u8e2a\u9879\u76ee<\/a>\uff0c\u6211\u53d1\u89c9\u6211\u73b0\u5728\u4e86\u89e3\u4e86\u4e00\u4e9b\u5173\u4e8e\u00a0gdb<\/code>\u00a0\u5185\u90e8\u5982\u4f55\u5de5\u4f5c\u7684\u5185\u5bb9\u3002<\/p>\n

\u6700\u8fd1\uff0c\u6211\u4f7f\u7528\u00a0gdb<\/code>\u00a0\u6765\u67e5\u770b\u6211\u7684 Ruby \u7a0b\u5e8f\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u5c06\u5bf9\u4e00\u4e2a Ruby \u7a0b\u5e8f\u8fd0\u884c\u00a0gdb<\/code>\u00a0\u3002\u5b83\u5b9e\u9645\u4e0a\u5c31\u662f\u4e00\u4e2a Ruby \u89e3\u91ca\u5668\u3002\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u6253\u5370\u51fa\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u7684\u5730\u5740\uff1aruby_current_thread<\/code>\u3002<\/p>\n

\u83b7\u53d6\u5168\u5c40\u53d8\u91cf<\/h3>\n

\u4e0b\u9762\u5c55\u793a\u4e86\u5982\u4f55\u83b7\u53d6\u5168\u5c40\u53d8\u91cf\u00a0ruby_current_thread<\/code>\u00a0\u7684\u5730\u5740\uff1a<\/p>\n

    \n
  1. $ <\/span>sudo<\/span> gdb<\/span> -<\/span>p <\/span>2983<\/span><\/code><\/li>\n
  2. (<\/span>gdb<\/span>)<\/span> p <\/span>&<\/span> ruby_current_thread<\/span><\/code><\/li>\n
  3. $2 <\/span>=<\/span> (<\/span>rb_thread_t<\/span> **)<\/span> 0x5598a9a8f7f0<\/span> <<\/span>ruby_current_thread<\/span>><\/span><\/code><\/li>\n<\/ol>\n

    \u53d8\u91cf\u80fd\u591f\u4f4d\u4e8e\u7684\u5730\u65b9\u6709\u5806heap<\/rt><\/ruby>\u3001\u6808stack<\/rt><\/ruby>\u6216\u8005\u7a0b\u5e8f\u7684\u6587\u672c\u6bb5text<\/rt><\/ruby>\u3002\u5168\u5c40\u53d8\u91cf\u662f\u7a0b\u5e8f\u7684\u4e00\u90e8\u5206\u3002\u67d0\u79cd\u7a0b\u5ea6\u4e0a\uff0c\u4f60\u53ef\u4ee5\u628a\u5b83\u4eec\u60f3\u8c61\u6210\u662f\u5728\u7f16\u8bd1\u7684\u65f6\u5019\u5206\u914d\u7684\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5f88\u5bb9\u6613\u7684\u627e\u51fa\u5168\u5c40\u53d8\u91cf\u7684\u5730\u5740\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b\uff0cgdb<\/code>\u00a0\u662f\u5982\u4f55\u627e\u51fa\u00a00x5598a9a87f0<\/code>\u00a0\u8fd9\u4e2a\u5730\u5740\u7684\u3002<\/p>\n

    \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b\u4f4d\u4e8e\u00a0\/proc<\/code>\u00a0\u76ee\u5f55\u4e0b\u4e00\u4e2a\u53eb\u505a\u00a0\/proc\/$pid\/maps<\/code>\u00a0\u7684\u6587\u4ef6\uff0c\u6765\u627e\u5230\u8fd9\u4e2a\u53d8\u91cf\u6240\u4f4d\u4e8e\u7684\u5927\u81f4\u533a\u57df\u3002<\/p>\n

      \n
    1. $ <\/span>sudo<\/span> cat<\/span> \/<\/span>proc<\/span>\/<\/span>2983<\/span>\/<\/span>maps <\/span>|<\/span> grep<\/span> bin<\/span>\/<\/span>ruby<\/span><\/code><\/li>\n
    2. 5598a9605000<\/span>-<\/span>5598a9886000<\/span> r<\/span>-<\/span>xp <\/span>00000000<\/span> 00<\/span>:<\/span>32<\/span> 323508<\/span> \/<\/span>home<\/span>\/<\/span>bork<\/span>\/.<\/span>rbenv<\/span>\/<\/span>versions<\/span>\/<\/span>2.1<\/span>.<\/span>6<\/span>\/<\/span>bin<\/span>\/<\/span>ruby<\/span><\/code><\/li>\n
    3. 5598a9a86000<\/span>-<\/span>5598a9a8b000<\/span> r<\/span>--<\/span>p <\/span>00281000<\/span> 00<\/span>:<\/span>32<\/span> 323508<\/span> \/<\/span>home<\/span>\/<\/span>bork<\/span>\/.<\/span>rbenv<\/span>\/<\/span>versions<\/span>\/<\/span>2.1<\/span>.<\/span>6<\/span>\/<\/span>bin<\/span>\/<\/span>ruby<\/span><\/code><\/li>\n
    4. 5598a9a8b000<\/span>-<\/span>5598a9a8d000<\/span> rw<\/span>-<\/span>p <\/span>00286000<\/span> 00<\/span>:<\/span>32<\/span> 323508<\/span> \/<\/span>home<\/span>\/<\/span>bork<\/span>\/.<\/span>rbenv<\/span>\/<\/span>versions<\/span>\/<\/span>2.1<\/span>.<\/span>6<\/span>\/<\/span>bin<\/span>\/<\/span>ruby<\/span><\/code><\/li>\n
    5. <\/code><\/li>\n<\/ol>\n

      \u6240\u4ee5\uff0c\u6211\u4eec\u770b\u5230\uff0c\u8d77\u59cb\u5730\u5740\u00a05598a9605000<\/code>\u00a0\u548c\u00a00x5598a9a8f7f0<\/code>\u00a0\u5f88\u50cf\uff0c\u4f46\u5e76\u4e0d\u4e00\u6837\u3002\u54ea\u91cc\u4e0d\u4e00\u6837\u5462\uff0c\u6211\u4eec\u628a\u4e24\u4e2a\u6570\u76f8\u51cf\uff0c\u770b\u770b\u7ed3\u679c\u662f\u591a\u5c11\uff1a<\/p>\n

        \n
      1. (<\/span>gdb<\/span>)<\/span> p<\/span>\/<\/span>x <\/span>0x5598a9a8f7f0<\/span> -<\/span> 0x5598a9605000<\/span><\/code><\/li>\n
      2. $4 <\/span>=<\/span> 0x48a7f0<\/span><\/code><\/li>\n
      3. <\/code><\/li>\n<\/ol>\n

        \u4f60\u53ef\u80fd\u4f1a\u95ee\uff0c\u8fd9\u4e2a\u6570\u662f\u4ec0\u4e48\uff1f\u8ba9\u6211\u4eec\u4f7f\u7528\u00a0nm<\/code>\u00a0\u6765\u67e5\u770b\u4e00\u4e0b\u7a0b\u5e8f\u7684\u7b26\u53f7\u8868\u3002<\/p>\n

          \n
        1. sudo<\/span> nm<\/span> \/<\/span>proc<\/span>\/<\/span>2983<\/span>\/<\/span>exe <\/span>|<\/span> grep<\/span> ruby_current_thread<\/span><\/code><\/li>\n
        2. 000000000048a7f0<\/span> b ruby_current_thread<\/span><\/code><\/li>\n<\/ol>\n

          \u6211\u4eec\u770b\u5230\u4e86\u4ec0\u4e48\uff1f\u80fd\u591f\u770b\u5230\u00a00x48a7f0<\/code>\u00a0\u5417\uff1f\u662f\u7684\uff0c\u6ca1\u9519\u3002\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u60f3\u627e\u5230\u7a0b\u5e8f\u4e2d\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u7684\u5730\u5740\uff0c\u90a3\u4e48\u53ea\u9700\u5728\u7b26\u53f7\u8868\u4e2d\u67e5\u627e\u53d8\u91cf\u7684\u540d\u5b57\uff0c\u7136\u540e\u518d\u52a0\u4e0a\u5728\u00a0\/proc\/whatever\/maps<\/code>\u00a0\u4e2d\u7684\u8d77\u59cb\u5730\u5740\uff0c\u5c31\u5f97\u5230\u4e86\u3002<\/p>\n

          \u6240\u4ee5\u73b0\u5728\uff0c\u6211\u4eec\u77e5\u9053\u00a0gdb<\/code>\u00a0\u505a\u4e86\u4ec0\u4e48\u3002\u4f46\u662f\uff0cgdb<\/code>\u00a0\u5b9e\u9645\u505a\u7684\u4e8b\u60c5\u66f4\u591a\uff0c\u8ba9\u6211\u4eec\u8df3\u8fc7\u76f4\u63a5\u8f6c\u5230\u2026<\/p>\n

          \u89e3\u5f15\u7528\u6307\u9488<\/h3>\n
            \n
          1. (<\/span>gdb<\/span>)<\/span> p ruby_current_thread<\/span><\/code><\/li>\n
          2. $1 <\/span>=<\/span> (<\/span>rb_thread_t<\/span> *)<\/span> 0x5598ab3235b0<\/span><\/code><\/li>\n<\/ol>\n

            \u6211\u4eec\u8981\u505a\u7684\u4e0b\u4e00\u4ef6\u4e8b\u5c31\u662f\u89e3\u5f15\u7528\u00a0ruby_current_thread<\/code>\u00a0\u8fd9\u4e00\u6307\u9488\u3002\u6211\u4eec\u60f3\u770b\u4e00\u4e0b\u5b83\u6240\u6307\u5411\u7684\u5730\u5740\u3002\u4e3a\u4e86\u5b8c\u6210\u8fd9\u4ef6\u4e8b\uff0cgdb<\/code>\u00a0\u4f1a\u8fd0\u884c\u5927\u91cf\u7cfb\u7edf\u8c03\u7528\u6bd4\u5982\uff1a<\/p>\n

              \n
            1. ptrace<\/span>(<\/span>PTRACE_PEEKTEXT<\/span>,<\/span> 2983<\/span>,<\/span> 0x5598a9a8f7f0<\/span>,<\/span> [<\/span>0x5598ab3235b0<\/span>])<\/span> =<\/span> 0<\/span><\/code><\/li>\n
            2. <\/code><\/li>\n<\/ol>\n

              \u4f60\u662f\u5426\u8fd8\u8bb0\u5f97\u00a00x5598a9a8f7f0<\/code>\u00a0\u8fd9\u4e2a\u5730\u5740\uff1fgdb<\/code>\u00a0\u4f1a\u95ee\uff1a\u201c\u563f\uff0c\u5728\u8fd9\u4e2a\u5730\u5740\u4e2d\u7684\u5b9e\u9645\u5185\u5bb9\u662f\u4ec0\u4e48\uff1f\u201d\u30022983<\/code>\u662f\u6211\u4eec\u8fd0\u884c gdb \u8fd9\u4e2a\u8fdb\u7a0b\u7684 ID\u3002gdb \u4f7f\u7528\u00a0ptrace<\/code>\u00a0\u8fd9\u4e00\u7cfb\u7edf\u8c03\u7528\u6765\u5b8c\u6210\u8fd9\u4e00\u4ef6\u4e8b\u3002<\/p>\n

              \u597d\u6781\u4e86\uff01\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u89e3\u5f15\u7528\u5185\u5b58\u5e76\u627e\u51fa\u5185\u5b58\u5730\u5740\u4e2d\u5b58\u50a8\u7684\u5185\u5bb9\u3002\u6709\u4e00\u4e9b\u6709\u7528\u7684\u00a0gdb<\/code>\u00a0\u547d\u4ee4\uff0c\u6bd4\u5982\u00a0x\/40w \u53d8\u91cf<\/code>\u00a0\u548c\u00a0x\/40b \u53d8\u91cf<\/code>\u00a0\u5206\u522b\u4f1a\u663e\u793a\u7ed9\u5b9a\u5730\u5740\u7684 40 \u4e2a\u5b57\/\u5b57\u8282\u3002<\/p>\n

              \u63cf\u8ff0\u7ed3\u6784<\/h3>\n

              \u4e00\u4e2a\u5185\u5b58\u5730\u5740\u4e2d\u7684\u5185\u5bb9\u53ef\u80fd\u770b\u8d77\u6765\u50cf\u4e0b\u9762\u8fd9\u6837\u3002\u53ef\u4ee5\u770b\u5230\u5f88\u591a\u5b57\u8282\uff01<\/p>\n

                \n
              1. (<\/span>gdb<\/span>)<\/span> x<\/span>\/<\/span>40b<\/span> ruby_current_thread<\/span><\/code><\/li>\n
              2. 0x5598ab3235b0<\/span>:<\/span> 16<\/span> -<\/span>90<\/span> 55<\/span> -<\/span>85<\/span> -<\/span>104<\/span> 85<\/span> 0<\/span> 0<\/span><\/code><\/li>\n
              3. 0x5598ab3235b8<\/span>:<\/span> 32<\/span> 47<\/span> 50<\/span> -<\/span>85<\/span> -<\/span>104<\/span> 85<\/span> 0<\/span> 0<\/span><\/code><\/li>\n
              4. 0x5598ab3235c0<\/span>:<\/span> 16<\/span> -<\/span>64<\/span> -<\/span>55<\/span> 115<\/span> -<\/span>97<\/span> 127<\/span> 0<\/span> 0<\/span><\/code><\/li>\n
              5. 0x5598ab3235c8<\/span>:<\/span> 0<\/span> 0<\/span> 2<\/span> 0<\/span> 0<\/span> 0<\/span> 0<\/span> 0<\/span><\/code><\/li>\n
              6. 0x5598ab3235d0<\/span>:<\/span> -<\/span>96<\/span> -<\/span>83<\/span> -<\/span>39<\/span> 115<\/span> -<\/span>97<\/span> 127<\/span> 0<\/span> 0<\/span><\/code><\/li>\n<\/ol>\n

                \u8fd9\u5f88\u6709\u7528\uff0c\u4f46\u4e5f\u4e0d\u662f\u975e\u5e38\u6709\u7528\uff01\u5982\u679c\u4f60\u662f\u4e00\u4e2a\u50cf\u6211\u4e00\u6837\u7684\u4eba\u7c7b\u5e76\u4e14\u60f3\u77e5\u9053\u5b83\u4ee3\u8868\u4ec0\u4e48\uff0c\u90a3\u4e48\u4f60\u9700\u8981\u66f4\u591a\u5185\u5bb9\uff0c\u6bd4\u5982\u50cf\u8fd9\u6837\uff1a<\/p>\n

                  \n
                1. (<\/span>gdb<\/span>)<\/span> p <\/span>*(<\/span>ruby_current_thread<\/span>)<\/span><\/code><\/li>\n
                2. $8 <\/span>=<\/span> {<\/span>self<\/span> =<\/span> 94114195940880<\/span>,<\/span> vm <\/span>=<\/span> 0x5598ab322f20<\/span>,<\/span> stack <\/span>=<\/span> 0x7f9f73c9c010<\/span>,<\/span><\/code><\/li>\n
                3. stack_size <\/span>=<\/span> 131072<\/span>,<\/span> cfp <\/span>=<\/span> 0x7f9f73d9ada0<\/span>,<\/span> safe_level <\/span>=<\/span> 0<\/span>,<\/span> raised_flag <\/span>=<\/span> 0<\/span>,<\/span><\/code><\/li>\n
                4. last_status <\/span>=<\/span> 8<\/span>,<\/span> state <\/span>=<\/span> 0<\/span>,<\/span> waiting_fd <\/span>=<\/span> -<\/span>1<\/span>,<\/span> passed_block <\/span>=<\/span> 0x0<\/span>,<\/span><\/code><\/li>\n
                5. passed_bmethod_me <\/span>=<\/span> 0x0<\/span>,<\/span> passed_ci <\/span>=<\/span> 0x0<\/span>,<\/span> top_self <\/span>=<\/span> 94114195612680<\/span>,<\/span><\/code><\/li>\n
                6. top_wrapper <\/span>=<\/span> 0<\/span>,<\/span> base_block <\/span>=<\/span> 0x0<\/span>,<\/span> root_lep <\/span>=<\/span> 0x0<\/span>,<\/span> root_svar <\/span>=<\/span> 8<\/span>,<\/span> thread_id <\/span>=<\/span><\/code><\/li>\n
                7. 140322820187904<\/span>,<\/span><\/code><\/li>\n<\/ol>\n

                  \u592a\u597d\u4e86\u3002\u73b0\u5728\u5c31\u66f4\u52a0\u6709\u7528\u4e86\u3002gdb<\/code>\u00a0\u662f\u5982\u4f55\u77e5\u9053\u8fd9\u4e9b\u6240\u6709\u57df\u7684\uff0c\u6bd4\u5982\u00a0stack_size<\/code>\u00a0\uff1f\u662f\u4ece\u00a0DWARF<\/code>\u00a0\u5f97\u77e5\u7684\u3002DWARF<\/code>\u00a0\u662f\u5b58\u50a8\u989d\u5916\u7a0b\u5e8f\u8c03\u8bd5\u6570\u636e\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u4ece\u800c\u50cf\u00a0gdb<\/code>\u00a0\u8fd9\u6837\u7684\u8c03\u8bd5\u5668\u80fd\u591f\u5de5\u4f5c\u7684\u66f4\u597d\u3002\u5b83\u901a\u5e38\u5b58\u50a8\u4e3a\u4e8c\u8fdb\u5236\u7684\u4e00\u90e8\u5206\u3002\u5982\u679c\u6211\u5bf9\u6211\u7684 Ruby \u4e8c\u8fdb\u5236\u6587\u4ef6\u8fd0\u884c\u00a0dwarfdump<\/code>\u00a0\u547d\u4ee4\uff0c\u90a3\u4e48\u6211\u5c06\u4f1a\u5f97\u5230\u4e0b\u9762\u7684\u8f93\u51fa\uff1a<\/p>\n

                  \uff08\u6211\u5df2\u7ecf\u91cd\u65b0\u7f16\u6392\u4f7f\u5f97\u5b83\u66f4\u5bb9\u6613\u7406\u89e3\uff09<\/p>\n

                    \n
                  1. DW_AT_name <\/span>\"rb_thread_struct\"<\/span><\/code><\/li>\n
                  2. DW_AT_byte_size <\/span>0x000003e8<\/span><\/code><\/li>\n
                  3. DW_TAG_member<\/span><\/code><\/li>\n
                  4. DW_AT_name <\/span>\"self\"<\/span><\/code><\/li>\n
                  5. DW_AT_type <\/span><<\/span>0x00000579<\/span>><\/span><\/code><\/li>\n
                  6. DW_AT_data_member_location DW_OP_plus_uconst <\/span>0<\/span><\/code><\/li>\n
                  7. DW_TAG_member<\/span><\/code><\/li>\n
                  8. DW_AT_name <\/span>\"vm\"<\/span><\/code><\/li>\n
                  9. DW_AT_type <\/span><<\/span>0x0000270c<\/span>><\/span><\/code><\/li>\n
                  10. DW_AT_data_member_location DW_OP_plus_uconst <\/span>8<\/span><\/code><\/li>\n
                  11. DW_TAG_member<\/span><\/code><\/li>\n
                  12. DW_AT_name <\/span>\"stack\"<\/span><\/code><\/li>\n
                  13. DW_AT_type <\/span><<\/span>0x000006b3<\/span>><\/span><\/code><\/li>\n
                  14. DW_AT_data_member_location DW_OP_plus_uconst <\/span>16<\/span><\/code><\/li>\n
                  15. DW_TAG_member<\/span><\/code><\/li>\n
                  16. DW_AT_name <\/span>\"stack_size\"<\/span><\/code><\/li>\n
                  17. DW_AT_type <\/span><<\/span>0x00000031<\/span>><\/span><\/code><\/li>\n
                  18. DW_AT_data_member_location DW_OP_plus_uconst <\/span>24<\/span><\/code><\/li>\n
                  19. DW_TAG_member<\/span><\/code><\/li>\n
                  20. DW_AT_name <\/span>\"cfp\"<\/span><\/code><\/li>\n
                  21. DW_AT_type <\/span><<\/span>0x00002712<\/span>><\/span><\/code><\/li>\n
                  22. DW_AT_data_member_location DW_OP_plus_uconst <\/span>32<\/span><\/code><\/li>\n
                  23. DW_TAG_member<\/span><\/code><\/li>\n
                  24. DW_AT_name <\/span>\"safe_level\"<\/span><\/code><\/li>\n
                  25. DW_AT_type <\/span><<\/span>0x00000066<\/span>><\/span><\/code><\/li>\n
                  26. <\/code><\/li>\n<\/ol>\n

                    \u6240\u4ee5\uff0cruby_current_thread<\/code>\u00a0\u7684\u7c7b\u578b\u540d\u4e3a\u00a0rb_thread_struct<\/code>\uff0c\u5b83\u7684\u5927\u5c0f\u4e3a\u00a00x3e8<\/code>\u00a0\uff08\u5373 1000 \u5b57\u8282\uff09\uff0c\u5b83\u6709\u8bb8\u591a\u6210\u5458\u9879\uff0cstack_size<\/code>\u00a0\u662f\u5176\u4e2d\u4e4b\u4e00\uff0c\u5728\u504f\u79fb\u4e3a\u00a024<\/code>\u00a0\u7684\u5730\u65b9\uff0c\u5b83\u6709\u7c7b\u578b\u00a031<\/code>\u00a0\u300231<\/code>\u00a0\u662f\u4ec0\u4e48\uff1f\u4e0d\u7528\u62c5\u5fc3\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728 DWARF \u4fe1\u606f\u4e2d\u67e5\u770b\u3002<\/p>\n

                      \n
                    1. < 1><0x00000031> DW_TAG_typedef<\/span><\/code><\/li>\n
                    2. DW_AT_name \"size_t\"<\/span><\/code><\/li>\n
                    3. DW_AT_type <0x0000003c><\/span><\/code><\/li>\n
                    4. < 1><0x0000003c> DW_TAG_base_type<\/span><\/code><\/li>\n
                    5. DW_AT_byte_size 0x00000008<\/span><\/code><\/li>\n
                    6. DW_AT_encoding DW_ATE_unsigned<\/span><\/code><\/li>\n
                    7. DW_AT_name \"long unsigned int\"<\/span><\/code><\/li>\n
                    8. <\/code><\/li>\n<\/ol>\n

                      \u6240\u4ee5\uff0cstack_size<\/code>\u00a0\u5177\u6709\u7c7b\u578b\u00a0size_t<\/code>\uff0c\u5373\u00a0long unsigned int<\/code>\uff0c\u5b83\u662f 8 \u5b57\u8282\u7684\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u67e5\u770b\u8be5\u6808\u7684\u5927\u5c0f\u3002<\/p>\n

                      \u5982\u679c\u6211\u4eec\u6709\u4e86 DWARF \u8c03\u8bd5\u6570\u636e\uff0c\u8be5\u5982\u4f55\u5206\u89e3\uff1a<\/p>\n

                        \n
                      1. \u67e5\u770b\u00a0ruby_current_thread<\/code>\u00a0\u6240\u6307\u5411\u7684\u5185\u5b58\u533a\u57df<\/li>\n
                      2. \u52a0\u4e0a\u00a024<\/code>\u00a0\u5b57\u8282\u6765\u5f97\u5230\u00a0stack_size<\/code><\/li>\n
                      3. \u8bfb 8 \u5b57\u8282\uff08\u4ee5\u5c0f\u7aef\u7684\u683c\u5f0f\uff0c\u56e0\u4e3a\u662f\u5728 x86 \u4e0a\uff09<\/li>\n
                      4. \u5f97\u5230\u7b54\u6848\uff01<\/li>\n<\/ol>\n

                        \u5728\u4e0a\u9762\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u662f\u00a0131072<\/code>\uff08\u5373 128 kb\uff09\u3002<\/p>\n

                        \u5bf9\u6211\u6765\u8bf4\uff0c\u8fd9\u4f7f\u5f97\u8c03\u8bd5\u4fe1\u606f\u7684\u7528\u9014\u66f4\u52a0\u660e\u663e\u3002\u5982\u679c\u6211\u4eec\u4e0d\u77e5\u9053\u8fd9\u4e9b\u6240\u6709\u53d8\u91cf\u6240\u8868\u793a\u7684\u989d\u5916\u7684\u5143\u6570\u636e\uff0c\u90a3\u4e48\u6211\u4eec\u65e0\u6cd5\u77e5\u9053\u5b58\u50a8\u5728\u00a00x5598ab325b0<\/code>\u00a0\u8fd9\u4e00\u5730\u5740\u7684\u5b57\u8282\u662f\u4ec0\u4e48\u3002<\/p>\n

                        \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u4f60\u53ef\u4ee5\u4e3a\u4f60\u7684\u7a0b\u5e8f\u5355\u72ec\u5b89\u88c5\u7a0b\u5e8f\u7684\u8c03\u8bd5\u4fe1\u606f\uff0c\u56e0\u4e3a\u00a0gdb<\/code>\u00a0\u5e76\u4e0d\u5173\u5fc3\u4ece\u4f55\u5904\u83b7\u53d6\u8fd9\u4e9b\u989d\u5916\u7684\u8c03\u8bd5\u4fe1\u606f\u3002<\/p>\n

                        DWARF \u4ee4\u4eba\u8ff7\u60d1<\/h3>\n

                        \u6211\u6700\u8fd1\u9605\u8bfb\u4e86\u5927\u91cf\u7684 DWARF \u77e5\u8bc6\u3002\u73b0\u5728\uff0c\u6211\u4f7f\u7528 libdwarf\uff0c\u4f7f\u7528\u4f53\u9a8c\u4e0d\u662f\u5f88\u597d\uff0c\u8fd9\u4e2a API \u4ee4\u4eba\u8ff7\u60d1\uff0c\u4f60\u5c06\u4ee5\u4e00\u79cd\u5947\u602a\u7684\u65b9\u5f0f\u521d\u59cb\u5316\u6240\u6709\u4e1c\u897f\uff0c\u5b83\u771f\u7684\u5f88\u6162\uff08\u9700\u8981\u82b1\u8d39 0.3 \u79d2\u7684\u65f6\u95f4\u6765\u8bfb\u53d6\u6211\u7684 Ruby \u7a0b\u5e8f\u7684\u6240\u6709\u8c03\u8bd5\u4fe1\u606f\uff0c\u8fd9\u771f\u662f\u53ef\u7b11\uff09\u3002\u6709\u4eba\u544a\u8bc9\u6211\uff0c\u6765\u81ea elfutils \u7684 libdw \u8981\u597d\u4e00\u4e9b\u3002<\/p>\n

                        \u540c\u6837\uff0c\u518d\u63d0\u53ca\u4e00\u70b9\uff0c\u4f60\u53ef\u4ee5\u67e5\u770b\u00a0DW_AT_data_member_location<\/code>\u00a0\u6765\u67e5\u770b\u7ed3\u6784\u6210\u5458\u7684\u504f\u79fb\u3002\u6211\u5728 Stack Overflow \u4e0a\u67e5\u627e\u5982\u4f55\u5b8c\u6210\u8fd9\u4ef6\u4e8b\uff0c\u5e76\u4e14\u5f97\u5230\u8fd9\u4e2a\u7b54\u6848<\/a>\u3002\u57fa\u672c\u4e0a\uff0c\u4ee5\u4e0b\u9762\u8fd9\u6837\u4e00\u4e2a\u68c0\u67e5\u5f00\u59cb\uff1a<\/p>\n

                          \n
                        1. dwarf_whatform<\/span>(<\/span>attrs<\/span>[<\/span>i<\/span>],<\/span> &<\/span>form<\/span>,<\/span> &<\/span>error<\/span>);<\/span><\/code><\/li>\n
                        2. if<\/span> (<\/span>form <\/span>==<\/span> DW_FORM_data1 <\/span>||<\/span> form <\/span>==<\/span> DW_FORM_data2<\/span><\/code><\/li>\n
                        3. form <\/span>==<\/span> DW_FORM_data2 <\/span>||<\/span> form <\/span>==<\/span> DW_FORM_data4<\/span><\/code><\/li>\n
                        4. form <\/span>==<\/span> DW_FORM_data8 <\/span>||<\/span> form <\/span>==<\/span> DW_FORM_udata<\/span>)<\/span> {<\/span><\/code><\/li>\n<\/ol>\n

                          \u7ee7\u7eed\u5f80\u524d\u3002\u4e3a\u4ec0\u4e48\u4f1a\u6709 800 \u4e07\u79cd\u4e0d\u540c\u7684\u00a0DW_FORM_data<\/code>\u00a0\u9700\u8981\u68c0\u67e5\uff1f\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f\u6211\u6ca1\u6709\u5934\u7eea\u3002<\/p>\n

                          \u4e0d\u7ba1\u600e\u4e48\u8bf4\uff0c\u6211\u7684\u5370\u8c61\u662f\uff0cDWARF \u662f\u4e00\u4e2a\u5e9e\u5927\u800c\u590d\u6742\u7684\u6807\u51c6\uff08\u53ef\u80fd\u662f\u4eba\u4eec\u7528\u6765\u751f\u6210 DWARF \u7684\u5e93\u7a0d\u5fae\u4e0d\u517c\u5bb9\uff09\uff0c\u4f46\u662f\u6211\u4eec\u6709\u7684\u5c31\u662f\u8fd9\u4e9b\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u80fd\u7528\u5b83\u6765\u5de5\u4f5c\u3002<\/p>\n

                          \u6211\u80fd\u591f\u7f16\u5199\u4ee3\u7801\u5e76\u67e5\u770b DWARF \uff0c\u8fd9\u5c31\u5f88\u9177\u4e86\uff0c\u5e76\u4e14\u6211\u7684\u4ee3\u7801\u5b9e\u9645\u4e0a\u5927\u591a\u6570\u80fd\u591f\u5de5\u4f5c\u3002\u9664\u4e86\u7a0b\u5e8f\u5d29\u6e83\u7684\u65f6\u5019\u3002\u6211\u5c31\u662f\u8fd9\u6837\u5de5\u4f5c\u7684\u3002<\/p>\n

                          \u5c55\u5f00\u6808\u8def\u5f84<\/h3>\n

                          \u5728\u8fd9\u7bc7\u6587\u7ae0\u7684\u65e9\u671f\u7248\u672c\u4e2d\uff0c\u6211\u8bf4\u8fc7\uff0cgdb<\/code>\u00a0\u4f7f\u7528 libunwind \u6765\u5c55\u5f00\u6808\u8def\u5f84\uff0c\u8fd9\u6837\u8bf4\u5e76\u4e0d\u603b\u662f\u5bf9\u7684\u3002<\/p>\n

                          \u6709\u4e00\u4f4d\u5bf9\u00a0gdb<\/code>\u00a0\u6709\u6df1\u5165\u7814\u7a76\u7684\u4eba\u53d1\u4e86\u5927\u91cf\u90ae\u4ef6\u544a\u8bc9\u6211\uff0c\u4e3a\u4e86\u80fd\u591f\u505a\u5f97\u6bd4 libunwind \u66f4\u597d\uff0c\u4ed6\u4eec\u82b1\u8d39\u4e86\u5927\u91cf\u65f6\u95f4\u6765\u5c1d\u8bd5\u5982\u4f55\u5c55\u5f00\u6808\u8def\u5f84\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4f60\u5728\u7a0b\u5e8f\u7684\u4e00\u4e2a\u5947\u602a\u7684\u4e2d\u95f4\u4f4d\u7f6e\u505c\u4e0b\u6765\u4e86\uff0c\u4f60\u6240\u80fd\u591f\u83b7\u53d6\u7684\u8c03\u8bd5\u4fe1\u606f\u53c8\u5f88\u5c11\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u5bf9\u6808\u505a\u4e00\u4e9b\u5947\u602a\u7684\u4e8b\u60c5\uff0cgdb<\/code>\u00a0\u4f1a\u5c1d\u8bd5\u627e\u51fa\u4f60\u4f4d\u4e8e\u4f55\u5904\u3002<\/p>\n

                          gdb \u80fd\u505a\u7684\u5176\u4ed6\u4e8b<\/h3>\n

                          \u6211\u5728\u8fd9\u513f\u6240\u63cf\u8ff0\u7684\u4e00\u4e9b\u4e8b\u8bf7\uff08\u67e5\u770b\u5185\u5b58\uff0c\u7406\u89e3 DWARF \u6240\u5c55\u793a\u7684\u7ed3\u6784\uff09\u5e76\u4e0d\u662f\u00a0gdb<\/code>\u00a0\u80fd\u591f\u505a\u7684\u5168\u90e8\u4e8b\u60c5\u3002\u9605\u8bfb Brendan Gregg \u7684\u6614\u65e5 gdb \u4f8b\u5b50<\/a>\uff0c\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\uff0cgdb<\/code>\u00a0\u4e5f\u80fd\u591f\u5b8c\u6210\u4e0b\u9762\u8fd9\u4e9b\u4e8b\u60c5\uff1a<\/p>\n