[lldb-dev] LLDB gcc std lib data formatters

[Bryan Bennetts via lldb-dev]

Hi,

Apologies if this is  the wrong forum for this question - redirection to
the correct place would be appreciated...

I am running

lldb --version
lldb-900.0.64
  Swift-4.0

with binaries compiled using g++

g++-5 --version
g++-5 (Homebrew GCC 5.5.0_2) 5.5.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.(although I have tried a build from repo as well)


The website <https://lldb.llvm.org/varformats.html> implies that gcc std
library formatters should be available:

By default, several categories are created in LLDB:

   - default: this is the category where every formatter ends up, unless
   another category is specified
   - objc: formatters for basic and common Objective-C types that do not
   specifically depend on Mac OS X
   - gnu-libstdc++: formatters for std::string, std::vector, std::list and
   std::map as implemented by libstdcpp

However I see:

(lldb) type category list

       Category: default (enabled)
Category: VectorTypes (enabled, applicable for language(s): objective-c++)
Category: runtime-synthetics (enabled, applicable for language(s):
objective-c++, swift)
Category: system (enabled, applicable for language(s): objective-c++)
(lldb) type category enable gnu-libstdc++

       warning: empty category enabled (typo?)

And the std containers do not print nicely:

containerTest: cat main.cpp
#include <iostream>
#include <vector>

using namespace std;

int main()
{
    auto v = vector< unsigned >{ 0, 1, 2, 3, 4, 5, 6, 7, 9 };

    for( auto i : v )
    {
        cout << i << "\n";
    }

    return( 0 );
}
 containerTest: g++-5 -g -std=c++11  main.cpp
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:157:11:
warning: section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:157:11: note:
change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:386:11:
warning: section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:386:11: note:
change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:430:11:
warning: section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:430:11: note:
change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:683:11:
warning: section "__textcoal_nt" is deprecated
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
/var/folders/2_/07xjgwq904376gst9m3ddb100000gn/T//cctjpiwL.s:683:11: note:
change section name to "__text"
        .section __TEXT,__textcoal_nt,coalesced,pure_instructions
                 ^      ~~~~~~~~~~~~~
 containerTest: lldb ./a.out
(lldb) target create "./a.out"
Current executable set to './a.out' (x86_64).
(lldb) b main
Breakpoint 1: where = a.out`main + 13 at main.cpp:8, address =
0x0000000100001673
(lldb) run
Process 98294 launched: './a.out' (x86_64)
Process 98294 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000100001673 a.out`main at main.cpp:8
   5
   6    int main()
   7    {
-> 8        auto v = vector< unsigned >{ 0, 1, 2, 3, 4, 5, 6, 7, 9 };
   9
   10      for( auto i : v )
   11      {
Target 0: (a.out) stopped.
(lldb) n
Process 98294 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
    frame #0: 0x00000001000016bd a.out`main at main.cpp:10
   7    {
   8        auto v = vector< unsigned >{ 0, 1, 2, 3, 4, 5, 6, 7, 9 };
   9
-> 10      for( auto i : v )
   11      {
   12          cout << i << "\n";
   13      }
Target 0: (a.out) stopped.
(lldb) p v
(vector<unsigned int, allocator<unsigned int> >) $0 = {
  _Vector_base<unsigned int, allocator<unsigned int> > = {
    _M_impl = {
      _M_start = 0x0000000100402050
      _M_finish = 0x0000000100402074
      _M_end_of_storage = 0x0000000100402074
    }
  }
}
(lldb)

Anyone able to point me at either a python pretty printer or solution to
this?

Cheers, Bryan.
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