Memory Management

Wyn uses an arena allocator. Strings and arrays are allocated from a per-thread arena that grows as needed.

For Short-Lived Programs

No action needed. The arena is freed when the program exits.

For HTTP Servers

Http.accept() automatically resets the arena per request. Memory stays stable.

For Long-Running Programs

Call System.gc() periodically to reset the arena:

while true {
    process_batch()
    System.gc()  // Reset arena
}

defer

Use defer to run cleanup at the end of a scope:

fn process_file(path: string) -> int {
    var content = File.read(path)
    defer File.delete("/tmp/work.txt")  // Runs when function returns

    File.write("/tmp/work.txt", content.upper())
    // ... do work ...
    return 0
}  // defer runs here

--mem-stats

Check memory usage with:

wyn run myapp.wyn --mem-stats

Shows peak resident set size after execution.

WYN_STRICT Mode

Set WYN_STRICT=1 to make the runtime exit on errors instead of continuing:

WYN_STRICT=1 wyn run myapp.wyn

This catches:

• Array out-of-bounds access
• Integer overflow (with Math.checked_add/sub/mul)