waPC Swift Host

This is the (incomplete) Swift implementation of the waPC standard for WebAssembly host runtimes.

Usage

Refer to the Tests for usage examples with the included "hello" sample modules.

Note

This library is not fully implemented yet. The following is an incomplete list of functionality this library requires:

• Run a WebAssembly Module originally written in Rust
• Run a WebAssembly Module originally written in TinyGo
• Run a WebAssembly Module originally written in Zig
• Run a WebAssembly Module originally written in AssemblyScript (Does not work)
• Run a WebAssembly Module originally written in Swift (Untested)
• Provide host call upon WapcHost initialization instead of predefined log implementation
• Implement __console_log Host Guest calls host to log to host’s stdout (if permitted)
• Implement __host_call Host Guest calls to request the host perform an operation
• Implement __host_response Host Tells the host the pointer address at which to store its response
• Implement __host_response_len Host Returns the length of the host’s response
• Implement __host_error Host Tells the host the pointer address at which to store its error blob
• Implement __host_error_len Host Returns the length of the host error blob
• Implement __guest_response Host Called by the guest to set the pointer and length of the guest’s response blob
• Implement __guest_error Host Called by the guest to set the pointer and length of the guest’s error blob
• Implement __guest_request Host Called by the guest to tell the host the pointer addresses of where to store the request’s operation (string) and request payload (blob) values.
• Implement __guest_call Guest Invoked by the host to tell the guest to begin processing a function call. The guest will then retrieve the parameters and set response values via host calls.
• Resolve state capturing that happens when registering handler functions, specifically with __guest_request that necessitates us to call addImportHandler only after the __guest_call function is called.