wasm-run

Run arbitrary WASM/WASI files

Installation

$ npm install wasm-run -g

Usage

$ wasm-run --help        
wasm-run [options] <file> [--] [args..]

Options:
  -i, --invoke     Function to execute  [string]
  -t, --timeout    Execution timeout (ms)
      --trace      Trace imported function calls  [boolean]
      --gas-limit  Gas limit  [default: 100000]
      --version    Show version number  [boolean]
      --help       Show help  [boolean]

Run a single exported function

$ wasm-run ./test/fib32.wasm 32
[runtime] Running fib(32)...
[runtime] Result: 2178309

WAT file with multivalue support

$ wasm-run --invoke=swap_i64 ./test/swap.wat 10 12
[runtime] Converted to binary (256 bytes)
[runtime] Running swap_i64(10,12)...
[runtime] Result: 12,10

WASI support

$ wasm-run wasi-hello-world.wasm
Hello world!

Imported function tracing

$ wasm-run --trace wasi-hello-world.wasm
[runtime] wasi_snapshot_preview1!fd_prestat_get 3,65528 => 0
[runtime] wasi_snapshot_preview1!fd_prestat_dir_name 3,70064,2 => 0
[runtime] wasi_snapshot_preview1!fd_prestat_get 4,65528 => 0
[runtime] wasi_snapshot_preview1!fd_prestat_dir_name 4,70064,2 => 0
...

Gas metering/limiting

wasm-meter can be installed via npm install wasm-metering -g

$ wasm-meter fib64.wasm fib64.metered.wasm
$ wasm-run fib64.metered.wasm 8
[runtime] Running fib(8)...
[runtime] Result: 21
[runtime] Gas used: 5.1874
$ wasm-run fib64.metered.wasm 30
[runtime] Running fib(30)...
[runtime] Error: Run out of gas (gas used: 100000.0177)

Features

☑ Load wasm and wat files (using Binaryen)
☑ Run specific exported function
☑ Run wasi-snapshot-preview1 apps via --experimental-wasi-unstable-preview1 flag
☑ Run wasi-unstable apps (compatibility layer)
☑ i64 args, multi-value, bulk-memory, tail-calls support via experimental flags
☑ Generic imports tracing
☑ Gas metering/limiting
☐ Compiled wasm caching (blocked by #1)
☐ WASI API and structures decoding (generate from witx?)
☐ REPL mode