https://github.com/surma/bfwasm

A non-optimizing Brainf_ck to WebAssembly compiler
https://github.com/surma/bfwasm

Last synced: 16 days ago
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A non-optimizing Brainf_ck to WebAssembly compiler

• Host: GitHub
• URL: https://github.com/surma/bfwasm
• Owner: surma
• License: apache-2.0
• Created: 2019-08-30T14:37:47.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2019-10-04T00:18:11.000Z (about 5 years ago)
• Last Synced: 2024-10-14T12:47:51.624Z (about 1 month ago)
• Language: JavaScript
• Homepage: https://npm.im/@surma/bfwasm
• Size: 77.1 KB
• Stars: 25
• Watchers: 3
• Forks: 3
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING
  • License: LICENSE
  • Codeowners: CODEOWNERS

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README

        
# bfwasm

A non-optimizing [Brainf_ck][bf] to WebAssembly compiler. Yes, compiler. Not interpreter.

## Installation

```

npm install -g @surma/bfwasm

```

## Usage (CLI)

```

Usage: bfwasm [options]

Options:

  -o, --output   File to write compiled Wasm to

  -r, --run            Run compiled Wasm (implies --asyncify)

  --mem-dump        Dump the first N cells of memory after run

  --hex-output         Turn std out into hexadecimap

  --asyncify           Run Binaryen Asyncify pass

  --wasi               Use WASI for I/O

  -h, --help           output usage information

```

## Usage (API)

```js

import { compile } from "@surma/bfwasm";

const wasmBuffer = compile(`

  ++++++++++[>++++++++++++++++++++++

  >+++++++++++++++>++++++++++++++++>+

  <<<<-]>++++++.>+++++++.>++++.

`);

const decoder = new TextDecoder();

const importsObj = {

  env: {

    in() {

      /* Called when bf programm needs input */

      return 0;

    },

    out(v) {

      /* Called when bf programm has output */

      console.log(

        decoder.decode(new Uint8Array([v]), {stream: true})

      );

    }

  }

};

const {instance} = await WebAssembly.instantiate(wasmBuffer, importsObj);

instance.exports._start();

```

**compile(program, options)** compiles `program` to a WebAssembly module exporting a `"_start"` function.

Options:

- `exportMemory` (default: `true`) will export the memory as `"memory"`.

- `autoRun` (default: `false`) will declare `"_start"` as the module’s start function.

- `useWasi` (default: `false`) use [WASI core] for I/O.

---

License Apache-2.0

[bf]: http://www.muppetlabs.com/~breadbox/bf/

[wasi core]: https://github.com/CraneStation/wasmtime/blob/master/docs/WASI-api.md