imported-start.js - mozsearch

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// An imported function that ends in a return call to a wider stack-argument

// signature must not leave the import wrapper reading its frame slots with a

// stale stack pointer.

const count = 32;

const args = Array.from({length: count}, (_, i) =>

  `(i64.const ${i + 1})`).join(" ");

const provider = wasmEvalText(`(module

  (global $result (export "result") (mut i64) (i64.const 0))

  (func $save (param ${"i64 ".repeat(count)})

    (global.set $result (local.get ${count - 1})))

  (func (export "start")

    ${args}

    return_call $save)

)`);

wasmEvalText(`(module

  (import "m" "start" (func $start))

  (start $start)

)`, {m: {start: provider.exports.start}});

assertEq(provider.exports.result.value, 32n);