Enable calls to JS. Update some tests. #61
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This test relies more heavily on the runtime, which is not available from the Emscripten interpreter. Thus, I've disabled the interpreter tests and now we rely solely on the V8 tests. This change also switches to using the asynchronous WebAssembly API.
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This PR enables a few more tests that were previously xfailed or disabled during one of my recent changes.
The most significant change is that we now have a way of importing arbitrary functions from the host. See
tinycore.rsfor an example of how this works. Basically, you create anexternblock with#[link(name)]. Then mir2wasm will emit imports for each of the functions in the block from the modulename.Using this new capability,
rustrt.jsnow provides apanicfunction, which is called by Rust when code panics. Right now this just throws a Javascript error, but we could improve this significantly.Unfortunately, the binaryen interpreter doesn't give us a way to import Javascript (as far as I know), so we can't call into
rustrt.js. Because of this, I've disabled running in binaryen in the tests. This means from now on our only supported mode of execution is in a proper JS VM.This change also includes some miscellaneous cleanup and refactoring, although more is still needed. Finally, I pointed the binaryen submodule at my own fork because I need a small fix to run on one of my Linux machines, but we can't merge this into binaryen proper because of ASAN failures.