Source code
Revision control
Copy as Markdown
Other Tools
// Casting an external value is an expected failure
let { refCast, refTest, brOnCast, brOnCastFail } = wasmEvalText(`
(module
(; give this struct a unique identity to avoid conflict with
the struct type defined in wasm.js ;)
(type (struct (field i64 i32 i64 i32)))
(func (export "refTest") (param externref) (result i32)
local.get 0
any.convert_extern
ref.test (ref 0)
)
(func (export "refCast") (param externref) (result i32)
local.get 0
any.convert_extern
ref.cast (ref null 0)
drop
i32.const 0
)
(func (export "brOnCast") (param externref) (result i32)
(block (result (ref 0))
local.get 0
any.convert_extern
br_on_cast 0 anyref (ref 0)
drop
i32.const 0
br 1
)
drop
i32.const 1
)
(func (export "brOnCastFail") (param externref) (result i32)
(block (result anyref)
local.get 0
any.convert_extern
br_on_cast_fail 0 anyref (ref 0)
drop
i32.const 1
br 1
)
drop
i32.const 0
)
)
`).exports;
for (let v of WasmNonNullExternrefValues) {
assertErrorMessage(() => refCast(v), WebAssembly.RuntimeError, /bad cast/);
assertEq(refTest(v), 0);
assertEq(brOnCast(v), 0);
assertEq(brOnCastFail(v), 0);
}