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browser-based gdb frontend using Flask and JavaScript to visually debug C, C++, Go, or Rust

Project description

A browser-based frontend/gui for GDB

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:alt: gdbgui

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A modern, browser-based frontend to gdb (gnu debugger). Add breakpoints, view stack traces, and more in C, C++, Go, and Rust! Simply run ``gdbgui`` from the terminal and a new tab will open in your browser. `Screenshots <>`_ are below.

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If you are using gdbgui in a commercial setting, `consider donating to the project <>`_.

- Debug a different program in each tab (new gdb instance is spawned for each tab)
- Set/remove breakpoints
- View stack, threads
- Switch frame on stack, switch between threads
- Intuitively explore local variables when paused
- Hover over variables in source code to view contents
- Evaluate arbitrary expressions and plot their values over time
- Explore an interactive tree view of your data structures
- Jump back into the program's state to continue debug unexpected faults (i.e. SEGFAULT)
- Inspect memory in hex/character form
- View all registers
- Dropdown of files used to compile binary, with autocomplete functionality
- Source code explorer with ability to jump to line
- Show assembly next to source code, highlighting current instruction. Can also step through instructions.
- Assembly is displayed if source code cannot be found
- Notifications when new gdbgui updates are available

Why gdbgui?
- Actively developed to be compatible with current gdb releases
- Does only one thing: debugs programs. No integrated build system, no project settings, nothing to make things more complicated than they need to be.
- Design influenced by the amazing Chrome debugger
- Full gdb command line utility built-in
- The only gdb frontend built with Python and JavaScript
- Rapid development cycle and rich feature set due to ecosystem of Python and JavaScript
- Open source and free


Python versions: 2.7, 3.4, 3.5, 3.6, 3.6-dev, 3.7-dev, pypy

Operating systems: Ubuntu 14.04+, macOS, Windows (in cygwin)

Browsers: Chrome

gdb: 7.7+

Languages: C, C++, golang, rust (any language supported by gdb itself)

pip version 8 or higher. Python 2.7 or 3.4+. Python 3.x is recommended.


sudo apt-get install python-pip
python -m pip install --upgrade pip

If you cannot upgrade pip due to a system-owned installation, you can run in a virtualenv, which safely sandboxes your python environment:


python -m pip install virtualenv
virtualenv venv -p python3
source venv/bin/activate
python -m pip install --upgrade pip

macOS users should follow `these instructions <>`__ to codesign gdb for the error ``please check gdb is codesigned - see taskgated(8)``

You must also have gdb installed system-wide or have a gdb executable available.


using pip (recommended)


pip install gdbgui --upgrade

Or, to install it system wide:


sudo pip install gdbgui --upgrade

macOS users should run this for system wide installations:


sudo pip install gdbgui --upgrade --user

Windows has been tested to work with `cygwin <>`_.



git clone
cd gdbgui
[sudo] pip install -r requirements.txt [--user]


Running Locally

gdbgui [-h] [-p PORT] [--host HOST] [-r] [-g GDB] [--lldb] [-v]
[--hide_gdbgui_upgrades] [--debug] [-n]
[cmd [cmd ...]]

A new tab in your browser will open with gdbgui in it.

- If the browser did not open: open it and navigate to the ip/port that gdbgui is being served on (i.e. ``localhost:5000``)
- Type the path to the executable in the input at the top (next to "Load the Binary and Args"). The executable should already exist and have been compiled with the ``-g`` flag.
- Click ``Load the Binary and Args``. The program and symbols will load, but will not begin running. A breakpoint will be added to main automatically (this can be changed in settings)
- The source code will display if the program was compiled with debug symbols. If it's not, make sure you compiled your program with the ``-g`` flag.
- Click the ``Run`` button, which is on the top right and looks like a circular arrow.
- Step through the program by clicking the ``Next``, ``Step``, ``Continue``, etc. as desired. These are also on the top right.

Running Remotely
Because gdbgui is a server, it naturally allows you to debug programs running on other computers.

- ``ssh`` into the computer with the program that needs to be debugged.
- run ``gdbgui -r`` on the remote machine (this will serve publicly so beware of security here)
- on your local machine, open your browser and access the remote machine's ip and port
- debug the remote computer in your local browser

Positional arguments:
``command``: (Optional) The executable and arguments to run in gdb. This is a way to script the intial loading of the inferior program you wish to debug. For example ``gdbgui "./mybinary -myarg -flag1 -flag2"`` (note the quotes around the executable and arguments). Executables and arguments can also be input through the browser interface after launching (no quotes required there).

Flags (all are optional):
-h, --help show this help message and exit
-p PORT, --port PORT The port on which gdbgui will be hosted. Defaults to
--host HOST The host ip address on which gdbgui serve. Defaults to
-r, --remote Shortcut to sets host to and suppress browser
from opening. This allows remote access to gdbgui and
is useful when running on a remote machine that you
want to view/debug from your local browser, or let
someone else debug your application remotely.
-g GDB, --gdb GDB Path to gdb or lldb executable. Defaults to gdb. lldb
support is experimental.
--lldb Use lldb commands (experimental)
-v, --version Print version
Hide messages regarding newer version of gdbgui.
Defaults to False.
--debug The debug flag of this Flask application. Pass this
flag when debugging gdbgui itself to automatically
reload the server when changes are detected
-n, --no_browser By default, the browser will open with gdb gui. Pass
this flag so the browser does not open.
-x GDB_CMD_FILE, --gdb_cmd_file GDB_CMD_FILE
Execute GDB commands from file.

Example code and makefiles for C, C++, go, and rust, that build and launch gdb.

See the `examples folder <>`_.

gdbgui settings can be accessed by clicking the gear icon in the top right of the frontend. Most of these settings persist between sessions for the url and port.

Keyboard Shortcuts
The following keyboard shortcuts are available when the focus is not in an input field. They have the same effect as when the button is pressed.

- Run: r
- Continue: c
- Next: n or right arrow
- Step: s or down arrow
- Up: u or up arrow
- Next Instruction: m
- Step Instruction: ,

Debugging Faults
If your program exits unexpectedly from something like a SEGFAULT, simply type ``bt`` in the gdb console widget to make gdb run a "backtrace". This will repopulate gdbgui with the state that it was in when it exited, and allow you to inspect memory and variables.


pyPI and this github page are the only official sources of gdbgui.

How Does it Work?
1. The `pygdbmi library <>`__ manages gdb as a subprocess, and returns key/value pairs (dictionaries).
2. The `Flask-SocketIO <>`__ server (Flask+websockets) serves the webpage and provides realtime interactivity. http/websocket endpoints are available for the browser. Each websocket connection (browser tab) runs a pygdbmi-managed instance of gdb. A separate coroutine/thread continuously parses and forwards gdb's output to the browser.
3. The browser manages its ui with mostly vanilla JavaScript and some libraries

There is no build system necessary to run or develop this app.

The main components of gdbgui are

1. ````: The backend consists of a single Python file, which
makes use of `pygdbmi <>`__ to
interact with a gdb subprocess, and
`Flask <>`__ to set up url routing, websockets,
and http responses.

2. ``gdbgui.pug``: HTML file that defines the frontend

3. ``gdbgui.js``: The majority of the application is contained in this file. It dynamically updates the page, and maintains gdb state. It sends AJAX requests and uses websockets to interact with gdb through the server, then gets the response and updates the DOM as necessary.

4. ``gdbgui.css``: css stylesheet

Enter the binary and args just as you'd call them on the command line. Binary is restored when gdbgui is opened at a later time.

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Intuitive control of your program. From left to right: Run, Continue, Next, Step, Return, Next Instruction, Step Instruction, send interrupt signal (SIGINT) to inferior process.

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View all threads, the full stack on the active thread, the current frame on inactive threads. Switch between frames on the stack, or threads by pointing and clicking.

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Source Code
View source, assembly, add breakpoints. All symbols used to compile the target are listed in a dropdown above the source code viewer, and have autocompletion capabilities.

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With assembly. Note the bold line is the current instruction that gdb is stopped on.

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Variables and Expressions

All local variables are automatically displayed, and are clickable to explore their fields.

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Hover over a variable and explore it, just like in the Chrome debugger.

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Arbitrary expressions can be evaluated as well.

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Expressions record their previous values, and can be displayed in an x/y plot.

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Expressions can be interactively explored in a tree view.

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Memory Viewer
All hex addresses are automatically converted to clickable links to explore memory. Length of memory is configurable. In this case 16 bytes are displayed per row.

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View all registers. If a register was updated it is highlighted in yellow.

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gdb console
Read gdb output, and write to the gdb subprocess as desired. Don't let any gdb commandline skills you've developed go to waste.

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gdbgui at launch:

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``gdbgui`` would not be possible without the work of several amazing open source libraries


- splitjs:
- awesomplete:
- vis.js:
- moment.js
- lodash
- bootstrap
- jquery


- flask:
- flask-socket-io:
- pypugjs:
- Pygments:
- gevent:
- pygdbmi:

and `contributions from the community <>`_. Thank you!


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