Example: Rust Simple
This shows a simple example of compiling Rust to WASM and then to the JVM.
The root build script actually has the build commands to build it. But basically it runs
cargo build --release on this directory which compiles add_one from lib.rs into
target/wasm32-unknown-unknown/release/rust_simple.wasm. Then the build script takes that wasm file and compiles it
to asmble.generated.RustSimple in build/wasm-classes. The class is used by
Main.java. It is instantiated with a set of memory and then
add_one is invoked with 25 to return 26.
To run it yourself, you need the Gradle wrapper installed (see the root README's "Building and Testing" section, namely
gradle wrapper in the root w/ latest Gradle) and the latest Rust nightly (i.e. rustup default nightly and
rustup update) with the wasm32-unknown-unknown target installed (i.e.
rustup target add wasm32-unknown-unknown --toolchain nightly). Then run the following from the root asmble dir:
gradlew --no-daemon :examples:rust-simple:run
Yes, this does include Rust's std lib, but it's not that big of a deal (I'm keeping it around because in other examples
as part of issue #9 I'll need it). The actual method executed for add_one
looks like this decompiled:
private int $func0(final int n) {
return n + 1;
}