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Remove the module linking implementation in Wasmtime (#3958)

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* Remove the module linking implementation in Wasmtime

This commit removes the experimental implementation of the module
linking WebAssembly proposal from Wasmtime. The module linking is no
longer intended for core WebAssembly but is instead incorporated into
the component model now at this point. This means that very large parts
of Wasmtime's implementation of module linking are no longer applicable
and would change greatly with an implementation of the component model.

The main purpose of this is to remove Wasmtime's reliance on the support
for module-linking in `wasmparser` and tooling crates. With this
reliance removed we can move over to the `component-model` branch of
`wasmparser` and use the updated support for the component model.
Additionally given the trajectory of the component model proposal the
embedding API of Wasmtime will not look like what it looks like today
for WebAssembly. For example the core wasm `Instance` will not change
and instead a `Component` is likely to be added instead.

Some more rationale for this is in #3941, but the basic idea is that I
feel that it's not going to be viable to develop support for the
component model on a non-`main` branch of Wasmtime. Additionaly I don't
think it's viable, for the same reasons as `wasm-tools`, to support the
old module linking proposal and the new component model at the same
time.

This commit takes a moment to not only delete the existing module
linking implementation but some abstractions are also simplified. For
example module serialization is a bit simpler that there's only one
module. Additionally instantiation is much simpler since the only
initializer we have to deal with are imports and nothing else.

Closes #3941

* Fix doc link

* Update comments
This commit is contained in:
Alex Crichton
2022-03-23 14:57:34 -05:00
committed by GitHub
parent 6a60e8363f
commit 76b82910c9
51 changed files with 400 additions and 4555 deletions
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1
build.rs
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@@ -25,7 +25,6 @@ fn main() -> anyhow::Result<()> {
with_test_module(&mut out, "misc", |out| {
test_directory(out, "tests/misc_testsuite", strategy)?;
test_directory_module(out, "tests/misc_testsuite/multi-memory", strategy)?;
test_directory_module(out, "tests/misc_testsuite/module-linking", strategy)?;
test_directory_module(out, "tests/misc_testsuite/simd", strategy)?;
test_directory_module(out, "tests/misc_testsuite/threads", strategy)?;
test_directory_module(out, "tests/misc_testsuite/memory64", strategy)?;