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Expand the muli-value example for wasmtime-api to use many return values

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This should exercise the Rust-calling-Wasm code path for when there are more
return values than fit into return registers.
This commit is contained in:
Nick Fitzgerald
2019-10-29 14:24:36 -07:00
parent b3b7ce4f6b
commit a29303dedd
3 changed files with 56 additions and 6 deletions
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47
crates/api/examples/multi.rs
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@@ -51,19 +51,22 @@ fn main() -> Result<()> {
.context("Error instantiating module!")?,
);
// Extract export.
// Extract exports.
println!("Extracting export...");
let exports = Ref::map(instance.borrow(), |instance| instance.exports());
ensure!(!exports.is_empty(), "Error accessing exports!");
let run_func = exports[0].func().context("Error accessing exports!")?;
let g = exports[0].func().context("> Error accessing export $g!")?;
let round_trip_many = exports[1]
.func()
.context("> Error accessing export $round_trip_many")?;
// Call.
println!("Calling export...");
// Call `$g`.
println!("Calling export \"g\"...");
let args = vec![Val::I32(1), Val::I64(3)];
let results = run_func
let results = g
.borrow()
.call(&args)
.map_err(|e| format_err!("> Error calling function: {:?}", e))?;
.map_err(|e| format_err!("> Error calling g! {:?}", e))?;
println!("Printing result...");
println!("> {} {}", results[0].i64(), results[1].i32());
@@ -71,6 +74,38 @@ fn main() -> Result<()> {
debug_assert_eq!(results[0].i64(), 4);
debug_assert_eq!(results[1].i32(), 2);
// Call `$round_trip_many`.
println!("Calling export \"round_trip_many\"...");
let args = vec![
Val::I64(0),
Val::I64(1),
Val::I64(2),
Val::I64(3),
Val::I64(4),
Val::I64(5),
Val::I64(6),
Val::I64(7),
Val::I64(8),
Val::I64(9),
];
let results = round_trip_many
.borrow()
.call(&args)
.map_err(|e| format_err!("> Error calling round_trip_many! {:?}", e))?;
println!("Printing result...");
print!(">");
for r in results.iter() {
print!(" {}", r.i64());
}
println!();
debug_assert_eq!(results.len(), 10);
debug_assert!(args
.iter()
.zip(results.iter())
.all(|(a, r)| a.i64() == r.i64()));
// Shut down.
println!("Shutting down...");
drop(store);