{"id":3897,"date":"2019-10-07T19:41:17","date_gmt":"2019-10-07T11:41:17","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3897"},"modified":"2019-10-07T19:41:17","modified_gmt":"2019-10-07T11:41:17","slug":"linux-c-gdb%e5%a6%82%e4%bd%95debug%e5%ae%8f%e5%ae%9a%e4%b9%89","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3897","title":{"rendered":"[linux c] gdb\u5982\u4f55debug\u5b8f\u5b9a\u4e49"},"content":{"rendered":"
\n
\n
<\/div>\n<\/div>\n<\/div>\n
\u539f\u6587\u5730\u5740<\/a><\/div>\n
<\/div>\n
\n
\n
\n

\u672c\u6587\u5927\u6982\u9610\u8ff0\u5982\u4f55\u8ba9gdb\u80fd\u591f\u663e\u793a\u5b8f\u5b9a\u4e49\u7684\u503c\u4ee5\u53ca\u5bf9\u5e94\u7684\u539f\u7406<\/p>\n

gcc\u9ed8\u8ba4\u7f16\u8bd1\u7684\u65f6\u5019\uff0cgdb\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u662f\u4e0d\u80fd\u770b\u5230\u5b8f\u5b9a\u4e49\u7684\uff0c”p \u5b8f\u540d” \u4f1a\u663e\u793a\u9519\u8bef,\u5982\u4e0b\uff1a<\/p>\n

(gdb) p CLIENT6_BEGIN_FLG
\nNo symbol “CLIENT6_BEGIN_FLG” in current context.
\n(gdb)<\/p>\n

\u5176\u4e2d\u00a0#define CLIENT6_BEGIN_FLG “<Client6>”<\/p>\n

\u8fd9\u6837gdb\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u5c31\u5f88\u4e0d\u76f4\u89c2\uff0c\u5c24\u5176\u662f\u5f88\u591a\u5927\u578b\u7a0b\u5e8f\u4e2d\uff0c\u5b8f\u5b9a\u4e49\u6bd4\u8f83\u590d\u6742\u7684\u65f6\u5019\u3002<\/p>\n

\u5982\u679c\u9700\u8981\u5728gdb\u4e2d\u80fd\u67e5\u770b\u5b8f\u5b9a\u4e49\uff0cgcc\u7f16\u8bd1\u7684\u65f6\u5019\u9700\u8981\u52a0\u4e0a -gdwarf-2\u548c-g3\u7684\u53c2\u6570\u3002<\/p>\n

\u4e0b\u9762\u770b\u4e00\u4e0b-gdward-2 \u548c-g3\u53c2\u6570\u7684\u610f\u601d\u3002<\/p>\n

-g3 \u53c2\u6570\u7684\u610f\u601d\uff1a<\/p>\n

man gcc\uff0c\u53ef\u4ee5\u5f97\u51fa\u5982\u4e0b\u7684\u89e3\u91ca\uff1a<\/p>\n

-glevel
\n-ggdblevel
\n-gstabslevel
\n-gcofflevel
\n-gxcofflevel
\n-gvmslevel
\nRequest debugging information and also use level to specify how much information. \u00a0The default level is 2.<\/p>\n

Level 1 produces minimal information, enough for making backtraces in parts of the program that you don\u2019t plan to debug.
\nThis includes descriptions of functions and external variables, but no information about local variables and no line numbers.<\/p>\n

Level 3 includes extra information, such as all the macro definitions present in the program. \u00a0Some debuggers support macro
\nexpansion when you use -g3.<\/p>\n

\u52a0\u4e86-g3\u7684\u53c2\u6570\u540e\uff0cgcc\u7f16\u8bd1\u7684\u65f6\u5019\uff0c\u4f1a\u5c06\u6269\u5c55\u7684debug \u4fe1\u606f\u7f16\u8bd1\u8fdb\u4e8c\u8fdb\u5236\u6587\u4ef6\u91cc\u9762\uff0c\u5305\u62ec\u5b8f\u5b9a\u4e49\u4fe1\u606f\u3002<\/p>\n

\u6240\u4ee5\uff0c\u5982\u679c\u8981\u4f7f\u7528gdb\u8c03\u8bd5\u4e8c\u8fdb\u5236\u6587\u4ef6\u91cc\u9762\u7684\u5b8f\u5b9a\u4e49\u4fe1\u606f\uff0c\u8fd9\u4e2a\u9009\u9879\u5fc5\u987b\u5f00\u542f\u3002<\/p>\n

-gdwarf-2 \u53c2\u6570\u7684\u610f\u601d:<\/p>\n

man gcc, \u53ef\u4ee5\u5f97\u51fa\u5982\u4e0b\u76f8\u5173\u7684\u89e3\u91ca\uff1a<\/p>\n

-gdwarf-2 does not accept a concatenated debug level, because GCC used to support an option -gdwarf that meant to generate
\ndebug information in version 1 of the DWARF format (which is very different from version 2), and it would have been too con-
\nfusing. \u00a0That debug format is long obsolete, but the option cannot be changed now. \u00a0Instead use an additional -glevel option
\nto change the debug level for DWARF2.<\/p>\n

DWARF\u662f\u4e00\u79cd\u5e94\u7528\u7684\u6bd4\u8f83\u5e7f\u6cdb\u7684elf(\u53ef\u6267\u884c\u548c\u94fe\u63a5\u683c\u5f0f)\uff0c \u76ee\u524d\u6709dwarf1, dwarf2,dwarf3 3\u79cd\u7248\u672c\uff0c<\/p>\n

\u5176\u4e2d\u7248\u672c1\u5df2\u7ecf\u662f\u6bd4\u8f83\u8001\u65e7\u7684\uff0c\u57fa\u672c\u5e9f\u5f03\u4e0d\u7528\u4e86\u3002<\/p>\n

\u8fd9\u8fb9\u7684-gdwarf-2\u610f\u601d\u662f\u4f7f\u7528\u7248\u672c2\u7684\u683c\u5f0f\uff0c<\/p>\n

\u5bf9dwarf\u683c\u5f0f\u611f\u5174\u8da3\u7684\uff0c\u53ef\u4ee5\u770b\u4e00\u4e0bibm\u7684\u5f00\u53d1\u8005\u6587\u6863\uff1a<\/p>\n

http:\/\/www.ibm.com\/developerworks\/cn\/opensource\/os-debugging\/<\/p>\n

\u91cc\u9762\u4f1a\u6709\u4e00\u4e9b\u89e3\u91ca\u3002<\/p>\n

\u52a0\u4e0a\u76f8\u5173\u53c2\u6570\u540e\uff0c\u7f16\u8bd1:<\/p>\n

gcc -gdwarf-2 -g3 test.c<\/p>\n

gdb a.out\u540e\u5c31\u80fd\u591f\u4f7f\u7528 “p \u5b8f\u540d” \u8f93\u51fa\u5b8f\u7684\u5185\u5bb9\u4e86<\/p>\n

(gdb) p CLIENT6_BEGIN_FLG
\n$1 = “<Client6>”
\n(gdb)<\/p>\n

\u9700\u8981\u67e5\u770b\u5b8f\u5b9a\u4e49\u662f\u5982\u4f55\u88ab\u5c55\u5f00\u7684\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684\u547d\u4ee4:<\/p>\n

macro expand\u00a0macro_name<\/em><\/p>\n

\u5b98\u65b9\u53c2\u8003\uff1a<\/strong><\/p>\n

\u5177\u4f53\u8be6\u7ec6\u7684\u89e3\u91ca\u548c\u5176\u4ed6\u8bf4\u660e\uff0c\u53ef\u4ee5\u53c2\u8003GDB\u5b98\u65b9\u7f51\u7ad9,\u5185\u5bb9\u8fd8\u662f\u5f88\u597d\u61c2\u7684\u3002<\/p>\n

http:\/\/sourceware.org\/gdb\/current\/onlinedocs\/gdb\/Macros.html#Macros<\/p>\n

\u6709\u4e2a\u4e2d\u6587\u7ffb\u8bd1\u7684\u7f51\u5740\uff0c\u4e0d\u8fc7\u5e94\u8be5\u4e0d\u662f\u6700\u65b0\u7684\u4e86\u3002<\/p>\n

http:\/\/www.eifr.com\/article.php?id=1298&act=print<\/p>\n

GDB\u7f51\u5740:\u00a0http:\/\/www.gnu.org\/software\/gdb\/<\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"

\u539f\u6587\u5730\u5740 \u672c\u6587\u5927\u6982\u9610\u8ff0\u5982\u4f55\u8ba9gdb\u80fd\u591f\u663e<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-3897","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/3897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=3897"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/3897\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=3897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=3897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=3897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}