https://github.com/loopholelabs/wasm-toolkit

Toolkit for dealing with wasm (webassembly), including an strace like tool.
https://github.com/loopholelabs/wasm-toolkit

wasm webassembly

Last synced: about 1 month ago
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Toolkit for dealing with wasm (webassembly), including an strace like tool.

• Host: GitHub
• URL: https://github.com/loopholelabs/wasm-toolkit
• Owner: loopholelabs
• License: apache-2.0
• Created: 2023-03-24T18:35:41.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-07-04T19:16:12.000Z (5 months ago)
• Last Synced: 2024-08-03T17:15:20.440Z (4 months ago)
• Topics: wasm, webassembly
• Language: Go
• Homepage: https://loopholelabs.io
• Size: 6.3 MB
• Stars: 14
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-webassembly - loopholelabs/wasm-toolkit

README

        
# WASM Toolkit

A Toolkit for working with WebAssembly

[![License: Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-brightgreen.svg)](https://www.apache.org/licenses/LICENSE-2.0)

[![Discord](https://dcbadge.vercel.app/api/server/JYmFhtdPeu?style=flat)](https://loopholelabs.io/discord)

![Go Version](https://img.shields.io/badge/go%20version-%3E=1.18-61CFDD.svg)

[![Go Reference](https://pkg.go.dev/badge/github.com/loopholelabs/wasm-toolkit.svg)](https://pkg.go.dev/github.com/loopholelabs/wasm-toolkit)

## Features

* Encoding and decoding from `.wasm` binary (99% done)

* Encoding and decoding from `.wat` text (99% done)

* Adding strace like output to a wasm file, which gets output to `STDERR` as it runs.

  * All function calls, with arguments and return

  * All calls to imported functions, with args and return

  * Dwarf source file and line number ranges

  * Dwarf paramater names

  * Wasi preview1 call and return values

  * Function call count and timings summary

  * Watch globals by name (i32 only so far)

* wasm2wat but including dwarf debug information - line numbers, variable names, etc

* POC Embedding a file into a wasm which is then available to the module.

## Quickstart

* wasm2wat - `./wasm-toolkit wasm2wat -i something.wasm -o something.wat`

* wat2wasm - `./wasm-toolkit wat2wasm -i something.wat -o something.wasm`

* strace - `./wasm-toolkit strace -i something.wasm -o something-with-strace-stderr.wasm`

* embedfile - `./wasm-toolkit embedfile -i something.wasm -o something_embed.wasm --filename embedtest --content "This is some file data :)"`

## Strace

### Simple example

`./wasm-toolkit strace -i ../module1.wasm -o module1_strace.wasm --all --color --func '^\$IMPORT.*|\_start'`

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/screenshots/strace1.png)

### Filter functions

`./wasm-toolkit strace -i ../module1.wasm -o module1_strace.wasm --all --color --func '^\$main'`

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/screenshots/strace2.png)

### Profiling

`./wasm-toolkit strace -i ../module1.wasm -o module1_strace.wasm --all --color --func '.*' --timing true`

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/screenshots/strace3.png)

### Watch global variables

`./wasm-toolkit strace -i ../module1.wasm -o module1_strace.wasm --all --color --func '^\$main' --watch main.some_global,main.another_global`

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/screenshots/strace4.png)

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/screenshots/strace5.png)

You can also compile wasm-toolkit to wasm and add tracing to it :)

## Embed file (POC)

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/embed.png)

## Example output

On the left is an strace like output. On the right is a wat output with debugging info.

![alt text](https://raw.githubusercontent.com/loopholelabs/wasm-toolkit/master/output.png)

## TODO

* Dwarf watched globals - automatically determine type/length from dwarf data, support many types.

* Hook unreachable calls and add far more context to aid debugging. eg show all watched variables.

* Output to open telemetry standard.

* More dwarf data - check up on the rust generated data.

* Implement remainder of wasm instructions, fix bugs in wat parsing (comments etc).

* More work on linking / composability.

* Finish wasi file embed.

## Contributing

Bug reports and pull requests are welcome on GitHub at [https://github.com/loopholelabs/wasm-toolkit][gitrepo]. For more contribution information check out [the contribution guide](https://github.com/loopholelabs/wasm-toolkit/blob/master/CONTRIBUTING.md).

## License

The WASM Toolkit project is available as open source under the terms of the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0).

## Code of Conduct

Everyone interacting in the WASM Toolkit project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).

## Project Managed By:

[![https://loopholelabs.io][loopholelabs]](https://loopholelabs.io)

[gitrepo]: https://github.com/loopholelabs/wasm-toolkit

[loopholelabs]: https://cdn.loopholelabs.io/loopholelabs/LoopholeLabsLogo.svg

[loophomepage]: https://loopholelabs.io