llvm dev - Aug 2019 - How to use GDB to traverse the std::list in the program coredump?

I have tried stl-views-1.0.3.gdb，but it didn't work！I found it is a llvm
implement，when I print the list variable，it shows like：



$81 = {
    <std::__1::__list_imp<LogBufferElement*,
std::__1::allocator<LogBufferElement*> >> = {
    __end_ = {
    __prev_ = 0x7ee29b5940, 
    __next_ = 0x7ee2821d40
    }, 
    __size_alloc_ = {
         <std::__1::__compressed_pair_elem<unsigned long, 0, false>>
= {
        __value_ = 0x106b
    }, 
   
<std::__1::__compressed_pair_elem<std::__1::allocator<std::__1::__list_node<LogBufferElement*,
void*> >, 1, true>> = {
        <std::__1::allocator<std::__1::__list_node<LogBufferElement*,
void*> >> = {<No data fields>}, <No data fields>}, <No
data fields>}
  }, <No data fields>}


according to the code http://llvm.org/svn/llvm-project/libcxx/branchestemplate，I
tride the following command，But it failed！
(gdb) p /x ((LogBuffer *)0x7ee280dc00).mLogElements.__end_.__next_.__value_
There is no member or method named _value.


Anybody help me？
| |
自己
|
|
邮箱：hzy0719 at 163.com
|

签名由 网易邮箱大师 定制
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You'll need a gdb pretty printer - currently libc++ doesn't provide/have
any gdb pretty printers in-tree. the Chromium project has some though,
which you could use.
https://chromium.googlesource.com/chromium/src/+/master/third_party/libcxx-pretty-printers/printers.py

On Tue, Aug 6, 2019 at 1:05 PM 自己 via llvm-dev <llvm-dev at
lists.llvm.org>
wrote:
> I have tried stl-views-1.0.3.gdb，but it didn't work！I found it is a
llvm
> implement，when I print the list variable，it shows like：
>
> $81 = {
>     <std::__1::__list_imp<LogBufferElement*,
> std::__1::allocator<LogBufferElement*> >> = {
>     __end_ = {
>     __prev_ = 0x7ee29b5940,
>     __next_ = 0x7ee2821d40
>     },
>     __size_alloc_ = {
>          <std::__1::__compressed_pair_elem<unsigned long, 0,
false>> = {
>         __value_ = 0x106b
>     },
>
>
<std::__1::__compressed_pair_elem<std::__1::allocator<std::__1::__list_node<LogBufferElement*,
> void*> >, 1, true>> = {
>        
<std::__1::allocator<std::__1::__list_node<LogBufferElement*,
> void*> >> = {<No data fields>}, <No data fields>},
<No data fields>}
>   }, <No data fields>}
>
> according to the code
> http://llvm.org/svn/llvm-project/libcxx/branchestemplate，I tride the
> following command，But it failed！
> (gdb) p /x ((LogBuffer
> *)0x7ee280dc00).mLogElements.__end_.__next_.__value_ There is no member or
> method named _value.
>
> Anybody help me？
> 自己
> 邮箱：hzy0719 at 163.com
>
>
<https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?ftlId=1&name=%E8%87%AA%E5%B7%B1&uid=hzy0719%40163.com&iconUrl=http%3A%2F%2Fmail-online.nosdn.127.net%2Fa518fb61dd72e48dc844a81b80cae9d9.jpg&items=%5B%22%E9%82%AE%E7%AE%B1%EF%BC%9Ahzy0719%40163.com%22%5D>
>
> 签名由 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail88> 定制
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