My lldb toolbox

When you have learned to snatch the error code from the trap frame, it will be time for you to leave.

The Tao of Programming by Geoffrey James

This is a collection of useful actions for lldb, implemented as embedded Python scripts. Tested with lldb-10 and Python 3.6+. No third-party dependencies required except for lldb's Python module itself.

Installation

Clone this repo into $REPO_LOCATION and add the following lines to your ~/.lldbinit:

command script import $REPO_LOCATION/lldb-tbx/lldb_tbx

command script add -c lldb_tbx.ExportToJson export_to_json

You can leave out the commands you don't need.

Commands

Currently available commands:

• export_to_json : serialize an object and export it as JSON

export_to_json

For usage, type export_to_json --help.

Sample code:

#import <array>
#import <cstdint>

template <typename T> struct Bar {
  std::array<T, 2U> a{};
  std::int8_t i{};
};

int main() {
  Bar<float> bar{
      {0.1F, -0.1F},
      -5,
  };
  // break here
}

$ clang++-10 -std=c++17 -g -O0 -fstandalone-debug -Wall main.cpp
$ lldb-10 a.out
(lldb) break set -f main.cpp -l 16
(lldb) r
(lldb) export_to_json bar --indent 4

Result:

{
    "bar": {
        "@type_name": "Bar<float>",
        "@location": "0x00007fffffffdca0",
        "a": {
            "@type_name": "std::array<float, 2>",
            "@location": "0x00007fffffffdca0",
            "_M_elems": {
                "@type_name": "std::__array_traits<float, 2>::_Type",
                "@location": "0x00007fffffffdca0",
                "[0]": {
                    "@type_name": "float",
                    "@location": "0x00007fffffffdca0",
                    "@value": "0.100000001",
                    "@value_unsigned": 0,
                    "@value_signed": 0
                },
                "[1]": {
                    "@type_name": "float",
                    "@location": "0x00007fffffffdca4",
                    "@value": "-0.100000001",
                    "@value_unsigned": 0,
                    "@value_signed": 0
                }
            }
        },
        "i": {
            "@type_name": "int8_t",
            "@location": "0x00007fffffffdca8",
            "@value": "'\\xfb'",
            "@value_unsigned": 4294967291,
            "@value_signed": -5
        }
    }
}