如何在 gdb 中转储 STL 容器数据?

2022-01-24 00:00:00 containers gdb c++ stl

我无法在 gdb 中转储 STL 无序映射容器值.变量类型是std::unordered_map<>var;

I am not able to dump STL unordered map container values in gdb. variable type is std::unordered_map<> var;

我的 gdb 版本 - 7.7.1gdb 配置:

my gdb version - 7.7.1 Gdb configuration:

 configure --host=x86_64-linux-gnu --target=x86_64-linux-gnu
             --with-auto-load-dir=$debugdir:$datadir/auto-load
             --with-auto-load-safe-path=$debugdir:$datadir/auto-load
             --with-expat
             --with-gdb-datadir=/usr/local/share/gdb (relocatable)
             --with-jit-reader-dir=/usr/local/lib/gdb (relocatable)
             --without-libunwind-ia64
             --with-lzma
             --with-separate-debug-dir=/usr/local/lib/debug (relocatable)
             --with-system-gdbinit=/etc/gdb/gdbinit
             --with-zlib
             --without-babeltrace

g++ (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4

g++ (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4

打印 STL 容器值 n gdb 的正确方法是什么?

what is right way to print STL container values n gdb?

地图容器的gdb输出:

p 变量

$3 = {<std::__allow_copy_cons<true>> = {<No data fields>},                                                                                                                          [13/5219]
  _M_h = {<std::__detail::_Hashtable_base<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<ch
ar> > const, Metrics_s*>, std::__detail::_Select1st, std::equal_to<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::hash<std::basic_string<char, std::ch
ar_traits<char>, std::allocator<char> > >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >> = {<std::__detail::
_Hash_code_base<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, Metric
s_s*>, std::__detail::_Select1st, std::hash<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >

推荐答案

您的 gdb --configuration 输出缺少 --with-python 子句，所以我假设您的gdb 真的不能使用 python 扩展.根据这个 SO 答案 gdb 漂亮的打印不起作用 似乎有必要让漂亮的打印工作.

Your gdb --configuration output is missing --with-python clause, so I assume your gdb really cannot use python extensions. According to this SO answer gdb pretty printing is not working it seems to be necessary for pretty-print to work.

我在 docker 中的 ubuntu 14.04 带有漂亮的打印功能，并且 gdb 是使用 --with-python 配置的.看来，您的 gdb 安装是以某种方式定制的.您可以使用正确的选项从源重新编译 gdb，或者尝试从您的分发包中清除重新安装 gdb.

My ubuntu 14.04 in docker comes with pretty-print working as well as gdb is configured using --with-python. It seems, your gdb installation is somehow customized. You can either recompile the gdb from sources with correct options or try to clean reinstall gdb from your distribution packages.

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