使用GDB打印C ++类对象 [英] Printing C++ class objects with GDB

问题描述

在调试C ++应用程序时，是否有一些默认函数在GDB上打印类似字符串的对象？像这样：toString（）;

Is there some "default function" to print an object like a string on the GDB when we are debugging C++ applications? Something like: toString();

还是我的班必须实现类似的东西？

Or my class have to implement something like that?

推荐答案

您始终可以使用 print std :: string （或其他与此相关的内容） c>命令。但是，在C ++模板容器内部进行挣扎可能并不令人愉快。在最新版本的工具链（通常在大多数用户友好的Linux发行版中作为开发软件包的一部分安装在一起的GDB + Python + Pretty Printers）中，它们会被自动识别并打印（漂亮！）。例如：

You could always have printed std::string (or anything else for that matter) using print command. However, struggling with C++ template container internals might not be pleasant. In the recent versions of toolchains (GDB + Python + Pretty Printers that are usually installed together as part of the development packages on most user-friendly Linux distros), those are automatically recognized and printed (pretty!). For example:

$ cat test.cpp 
#include <string>
#include <iostream>

int main()
{
    std::string s = "Hello, World!";
    std::cout << s << std::endl;
}

$ g++ -Wall -ggdb -o test ./test.cpp 
$ gdb ./test 

(gdb) break main
Breakpoint 1 at 0x400ae5: file ./test.cpp, line 6.
(gdb) run
Starting program: /tmp/test 

Breakpoint 1, main () at ./test.cpp:6
6       std::string s = "Hello, World!";
Missing separate debuginfos, use: debuginfo-install glibc-2.16-28.fc18.x86_64 libgcc-4.7.2-8.fc18.x86_64 libstdc++-4.7.2-8.fc18.x86_64
(gdb) next
7       std::cout << s << std::endl;
(gdb) p s
$1 = "Hello, World!"
(gdb) 

正如@ 111111指出的那样，请查看 http://sourceware.org/gdb/wiki/STLSupport 了解有关如何自行安装此软件的说明。

As @111111 pointed out, check out http://sourceware.org/gdb/wiki/STLSupport for instructions on how to get this installed yourself.

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