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wasmtime: Initial, partial support for externref

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This is enough to get an `externref -> externref` identity function
passing.

However, `externref`s that are dropped by compiled Wasm code are (safely)
leaked. Follow up work will leverage cranelift's stack maps to resolve this
issue.
This commit is contained in:
Nick Fitzgerald
2020-05-22 17:12:45 -07:00
parent 137e182750
commit a8ee0554a9
41 changed files with 545 additions and 376 deletions
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4
tests/all/linker.rs
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@@ -56,11 +56,11 @@ fn link_twice_bad() -> Result<()> {
// tables
let ty = TableType::new(ValType::FuncRef, Limits::new(1, None));
let table = Table::new(&store, ty, Val::ExternRef(ExternRef::Null))?;
let table = Table::new(&store, ty, Val::ExternRef(None))?;
linker.define("", "", table.clone())?;
assert!(linker.define("", "", table.clone()).is_err());
let ty = TableType::new(ValType::FuncRef, Limits::new(2, None));
let table = Table::new(&store, ty, Val::ExternRef(ExternRef::Null))?;
let table = Table::new(&store, ty, Val::ExternRef(None))?;
assert!(linker.define("", "", table.clone()).is_err());
Ok(())
}