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ruby/wasm
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Yuta Saito 459bbdeb74 wasm/README.md: add manual config.guess download and autoconf steps 
Autoconf distributed with Ubuntu 22.04 is very old and doesn't support
WASI as an OS, so add instructions to download the latest config.guess,
then run `./autogen.sh`.

See also: 2297012efd
 		2022-03-15 10:25:12 +09:00
..
tests [wasm] add unit test suite for fiber, register scan, sjlj in platform dir 2022-01-19 11:19:06 +09:00
GNUmakefile.in [wasm] add unit test suite for fiber, register scan, sjlj in platform dir 2022-01-19 11:19:06 +09:00
README.md wasm/README.md: add manual config.guess download and autoconf steps 2022-03-15 10:25:12 +09:00
asyncify.h [wasm] vm.c: stop unwinding to main for every vm_exec call by setjmp 2022-02-18 18:28:18 +09:00
fiber.c
…
fiber.h
…
machine.c
…
machine.h
…
machine_core.S
…
missing.c
…
runtime.c
…
setjmp.c [wasm] vm.c: stop unwinding to main for every vm_exec call by setjmp 2022-02-18 18:28:18 +09:00
setjmp.h [wasm] vm.c: stop unwinding to main for every vm_exec call by setjmp 2022-02-18 18:28:18 +09:00
setjmp_core.S
…
wasm-opt
…

README.md

WebAssembly / WASI port of Ruby

How to cross-build

Requirement

Steps

  1. Download a prebuilt WASI SDK package from WASI SDK release page.
  2. Set WASI_SDK_PATH environment variable to the root directory of the WASI SDK package.
$ export WASI_SDK_PATH=/path/to/wasi-sdk-X.Y
  1. Download a prebuilt binaryen from Binaryen release page
  2. Set PATH environment variable to lookup binaryen tools
$ export PATH=path/to/binaryen:$PATH
  1. Download the latest config.guess with WASI support, and run ./autogen.sh to generate configure when you are building from the source checked out from Git repository
$ ruby tool/downloader.rb -d tool -e gnu config.guess config.sub
$ ./autogen.sh
  1. Configure
  • You can select which extensions you want to build.
  • If you got Out of bounds memory access while running the produced ruby, you may need to increase the maximum size of stack.
$ ./configure LDFLAGS="-Xlinker -zstack-size=16777216" \
  --host wasm32-unknown-wasi \
  --with-destdir=./ruby-wasm32-wasi \
  --with-static-linked-ext \
  --with-ext=ripper,monitor
  1. Make
$ make install

Now you have a WASI compatible ruby binary. You can run it by any WebAssembly runtime like wasmtime, wasmer, Node.js, or browser with WASI polyfill.

Note: it may take a long time (~20 sec) for the first time for JIT compilation

$ wasmtime ruby-wasm32-wasi/usr/local/bin/ruby --mapdir /::./ruby-wasm32-wasi/ -- -e 'puts RUBY_PLATFORM'
wasm32-wasi

Current Limitation

  • No Thread support for now.
  • Spawning a new process is not supported. e.g. Kernel.spawn and Kernel.system