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Clang In Browser (cib)

Try it at https://tbfleming.github.io/cib/

I'm trying to see how far wasm can go. Is it possible to compile clang to wasm and have it generate code within the browser?

Current status:

  • Works in Firefox 57 and Chrome 63

Change log:

  • Build EOS contracts: https://tbfleming.github.io/cib/eos.html
  • Integrate with user HTML
  • Load gists
  • Load header libraries in .zip files
  • The runtime now consumes much less memory with each press of the Run button
  • Standard library globals (e.g. cout)
  • Global constructors
  • Function pointers and virtual functions
  • RTTI

Currently missing:

  • Global destructors
  • Exception handling
  • stdin / cin. Waiting on browsers to restore SharedArrayBuffer.

VM for building clang

  • Create a fresh VM to build with. The build will probably fail if you already have emscripten or clang installed.
  • Consider using a high thread-count VM; e.g. an EC2 c5.9xlarge.
  • I put the repo in a dedicated volume while building; this aids using spot instances. 100 GB.

Ubuntu 16.04:

sudo apt update
sudo apt upgrade
sudo apt install build-essential cmake ninja-build python nodejs-legacy libncurses-dev unzip libboost1.58-tools-dev

Building WASM binaries

./build.py -a

This script:

  • Clones needed repos
  • Builds an llvm toolchain for targeting WASM
  • Builds emscripten
  • Invokes emscripten to:
    • set up environment
    • build emscripten's dependances
  • Uses emscripten to build llvm libraries
  • Builds the apps