The demo includes the javascript GUI that was used at the time (no longer mantained) LiveOS project (https://github.com/masc-ucsc/liveos)

Two bottlenecks in the LiveHD framework still potentially hinder our goal in achieving live feedback with HDLs. First, LiveHD only interfaces one HDL, System Verilog, by using Yosys. Second, LiveHD uses LGraph as the internal low-level IR, but the semantic gap between high-level modern HDLs and the LGraph IR makes it hard to interface directly. We further propose a language-neutral abstract syntax tree (LNAST) to address these problems. LNAST is a tree-based IR that bridges modern HDLs into LiveHD; it is a higher-level representation of a design than LGraph. LGraph and LNAST representations will be seamlessly converted to each other. As a high-level IR, LNAST can capture high-level semantics from different HDLs in the common tree structure. This enables HDLs to leverage the live synthesis and simulation framework in LiveHD. Another key motivation for designing LNAST is the generation of human-readable C++ and HDLs, which will be essential infrastructure for our future research projects of hardware simulation and Pyrope compiler verification.