6ab3ff71d2
* Add basic GuestString support to wiggle This commit adds basic `GuestString` support to `wiggle`. `GuestString` is a wrapper around `GuestArray<'_, u8>` array type which itself can be made into either an owned (cloned) Rust `String` or borrowed as a reference `&str`. In both cases, `GuestString` ensures that the underlying bytes are valid Unicode code units, throwing a `InvalidUtf8` error if not. This commit adds support *only* for passing in strings as arguments in WASI. Marshalling of the return arg has not yet been implemented. I'm not even sure it's possible without multi-value return args feature of Wasm. It's not a major setback especially since the WASI spec (and this includes even the `ephemeral` snapshot) doesn't return strings anywhere. They are only ever passed in as arguments to interface functions. It should be noted that error returned in case of invalid UTF-8 requires a lot more love as it doesn't include anything besides flagging an event that the string contained an invalid Unicode code unit. * Borrow all of string's memory including nul-byte Borrow all of string's underlying memory including the nul-byte. This perhaps might not have a tremendous impact on anything, but since the nul-byte is technically part of the WASI string, we should include it in the borrow as well. * Fill in wiggle-generate blanks for strings * Print to screen passed string in proptest * Strings are PointerLengthPairs! * Fix generation of strings in compound types * Update test with simple string strategy * Generate better test strings * Finalise proptest for strings * Fix formatting * Update crates/runtime/src/memory/string.rs Removes unnecessary comment in code * Apply Pat's suggestion to wrap Utf8Error as error
wiggle
An experimental implementation of bytecodealliance/wig crate which
generates Rust bindings from *.witx that are meant to be more idiomatic
and hopefully allowing for easier polyfilling between different WASI
snapshot versions in the future.