mattslaney/wasm-clang

Running Clang/LLD in WebAssembly Demo

Clang/LLD in WebAssembly

This is the demo for my CppCon 2019 talk! You can view the talk on youtube

Thing should work, but it's still very much alpha demoware. Go to https://binji.github.io/wasm-clang to see it in action.

Most of the JavaScript code can be found here. If you're interested in the implementation of the in-memory filesystem, take a look at https://github.com/binji/llvm-project/tree/master/binji.

Some notes on how I built this, sorry that they are relatively sparse: https://gist.github.com/binji/b7541f9740c21d7c6dac95cbc9ea6fca

Directory structure

Shared utilities

• clang: clang compiler, compiled to wasm w/ WASI
• lld: lld linker, compiled to wasm w/ WASI
• main.css
• memfs: WASI implementation of in-memory filesystem,
• shared.js: shared utilities for all tools (web and d8)
• shared_web.js: shared utilities for all web tools (asm.html, index.html, etc.)
• sysroot.tar: C++ standard headers and libraries
• service_worker.js: Service worker used by all web pages
• worker.js: Dedicated work used to compile/run

Assemble 6502 code

• 6502.html
• 6502.js
• vasm6502_oldstyle: vasm assembler compiled to wasm w/ WASI

Compile C++ code to x86/wasm assembly

• asm.html
• asm.js

Compile C++ code in d8 (v8's console shell)

• d8.js

Compile and run C++ code

• index.html
• web.js