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Add a first-class way of accessing caller's exports (#1290)

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* Add a first-class way of accessing caller's exports

This commit is a continuation of #1237 and updates the API of `Func` to
allow defining host functions which have easy access to a caller's
memory in particular. The new APIs look like so:

* The `Func::wrap*` family of functions was condensed into one
  `Func::wrap` function.
* The ABI layer of conversions in `WasmTy` were removed
* An optional `Caller<'_>` argument can be at the front of all
  host-defined functions now.

The old way the wasi bindings looked up memory has been removed and is
now replaced with the `Caller` type. The `Caller` type has a
`get_export` method on it which allows looking up a caller's export by
name, allowing you to get access to the caller's memory easily, and even
during instantiation.

* Add a temporary note

* Move some docs
This commit is contained in:
Alex Crichton
2020-03-18 16:57:31 -05:00
committed by GitHub
parent 1958e8af96
commit f63c3c814e
10 changed files with 550 additions and 509 deletions
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6
crates/api/tests/externals.rs
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@@ -62,7 +62,7 @@ fn cross_store() -> anyhow::Result<()> {
// ============ Cross-store instantiation ==============
let func = Func::wrap0(&store2, || {});
let func = Func::wrap(&store2, || {});
let ty = GlobalType::new(ValType::I32, Mutability::Const);
let global = Global::new(&store2, ty, Val::I32(0))?;
let ty = MemoryType::new(Limits::new(1, None));
@@ -84,8 +84,8 @@ fn cross_store() -> anyhow::Result<()> {
// ============ Cross-store globals ==============
let store1val = Val::FuncRef(Func::wrap0(&store1, || {}));
let store2val = Val::FuncRef(Func::wrap0(&store2, || {}));
let store1val = Val::FuncRef(Func::wrap(&store1, || {}));
let store2val = Val::FuncRef(Func::wrap(&store2, || {}));
let ty = GlobalType::new(ValType::FuncRef, Mutability::Var);
assert!(Global::new(&store2, ty.clone(), store1val.clone()).is_err());