Dev tools · September 30, 2025
JPDB, GDB for Your Waveforms
hey everyone, I've been working on JPDB is a GDB like debugger for waveforms. if you give JPDB a waveform* and some other information, then you can step through the program that was executed when that waveform was created. i say GDB-like because JPDB has it's own GDB client (its called shucks), that implements the client side logic of the GDB protocol faithfully, but doesnt have all of the GDB niceties (like python integration, etc). this allows the project to be specialized on debugging waveforms specifically, when compared to another approach like connecting to a gdb client JPDB integrates…
In plain words
JPDB is a debugger designed for analyzing waveforms generated during hardware design and simulation. Users can step through the program execution that created a waveform, similar to using GDB for software debugging. It includes Shucks, a specialized GDB-compatible client focused on waveform debugging rather than general-purpose development. JPDB integrates with the Surfer waveform viewer, allowing developers to examine signals alongside execution traces. The tool is aimed at hardware designers and CPU developers working with digital simulations and waveform data.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
hey everyone, I've been working on JPDB is a GDB like debugger for waveforms. if you give JPDB a waveform* and some other information, then you can step through the program that was executed when that waveform was created. i say GDB-like because JPDB has it's own GDB client (its called shucks), that implements the client side logic of the GDB protocol faithfully, but doesnt have all of the GDB niceties (like python integration, etc). this allows the project to be specialized on debugging waveforms specifically, when compared to another approach like connecting to a gdb client JPDB integrates with the waveform viewer surfer (https://surfer-project.org/), so you can look at other signals there. this is still ongoing because the underlying protocol (WCP) is a little Fresh if you're developing your own CPU, give it a shot. Superscalar designs arent supported yet but it would be pretty straightforward, just give me your waves ( i am touching my fingers together villainously as i type this) and i will make it happen also if you want to use system with a "normal" gdb client, the dang library presents a gdbstub server, so you can run that and connect to it. here's a demo but it should work on your local machine if you follow the readme: https://www.youtube.com/watch?v=EOo1aG_wcJg
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