https://github.com/malcolmstill/zware

Zig WebAssembly Runtime Engine
https://github.com/malcolmstill/zware

wasm webassembly zig ziglang

Last synced: 30 days ago
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Zig WebAssembly Runtime Engine

• Host: GitHub
• URL: https://github.com/malcolmstill/zware
• Owner: malcolmstill
• License: mit
• Created: 2021-02-01T04:27:54.000Z (almost 4 years ago)
• Default Branch: master
• Last Pushed: 2024-06-15T13:59:58.000Z (5 months ago)
• Last Synced: 2024-10-01T03:21:18.587Z (about 1 month ago)
• Topics: wasm, webassembly, zig, ziglang
• Language: Zig
• Homepage:
• Size: 3.11 MB
• Stars: 285
• Watchers: 8
• Forks: 10
• Open Issues: 15
• Metadata Files:
  • Readme: README.md
  • Contributing: docs/CONTRIBUTING.md
  • License: LICENSE.md

Awesome Lists containing this project

• awesome-zig - zware

README

        
zware




  

  


  Zig WebAssembly Runtime Engine



## About

`zware` is a library for executing WebAssembly embedded in [Zig](https://ziglang.org) programs.

## Example

From `examples/fib`:

```zig

const std = @import("std");

const zware = @import("zware");

const Store = zware.Store;

const Module = zware.Module;

const Instance = zware.Instance;

const GeneralPurposeAllocator = std.heap.GeneralPurposeAllocator;

var gpa = GeneralPurposeAllocator(.{}){};

pub fn main() !void {

    defer _ = gpa.deinit();

    const alloc = gpa.allocator();

    const bytes = @embedFile("fib.wasm");

    var store = Store.init(alloc);

    defer store.deinit();

    var module = Module.init(alloc, bytes);

    defer module.deinit();

    try module.decode();

    var instance = Instance.init(alloc, &store, module);

    try instance.instantiate();

    defer instance.deinit();

    const n = 39;

    var in = [1]u64{n};

    var out = [1]u64{0};

    try instance.invoke("fib", in[0..], out[0..], .{});

    const result: i32 = @bitCast(@as(u32, @truncate(out[0])));

    std.debug.print("fib({}) = {}\n", .{ n, result });

}

```

## Requirements

### Compile-time

- Zig 0.12 (master)

### Run-time

- None, zig generates static binaries:

```bash

➜  zware git:(master) ✗ ldd fib

        not a dynamic executable

```

## Goals

- Embed WebAssembly programs in other zig programs

- Be fast enough to be useful

## Status

- The project is very much alpha quality

- WebAssembly 2.0 supported (apart from the vector / SIMD support which is WIP)

- The WebAssembly official testsuite passes (not including SIMD tests)

- Partial WASI support

## Running tests

Use `zig build --help` to see all the test targets, here's a summary of the important ones:

```sh

zig build test      # Run all the tests (includes unittest and testsuite)

zig build unittest  # Run the library unittests

zig build testsuite # Run all the testsuite tests

zig build test-NAME # Run the NAME testsuite test, i.e. test-type

```

## Does it run doom?

Yes, [yes it does](https://github.com/malcolmstill/zware-doom)

https://github.com/malcolmstill/zware/assets/2567177/c9acdcb2-69e7-495f-b3f1-89cf6b807a43