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Repro for crbug 13958
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| // Build this file with: | |
| // rustc --target wasm32-unknown-unknown bigbox.rs | |
| #![crate_type = "cdylib"] | |
| type INNER = Vec<u8>; | |
| #[no_mangle] | |
| pub extern "C" fn make_big_box(len: usize) -> *mut core::ffi::c_void { | |
| let memory: Box<INNER> = Box::new(vec![0; len]); | |
| Box::into_raw(memory) as *mut core::ffi::c_void | |
| } | |
| #[no_mangle] | |
| pub unsafe extern "C" fn free_big_box(ptr: *mut core::ffi::c_void) { | |
| Box::from_raw(ptr as *mut INNER); | |
| } |
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| <!DOCTYPE html> | |
| <!-- | |
| View online at: | |
| https://storage.googleapis.com/static-493776/crbug13958/bigbox_frontend.html | |
| --> | |
| <script type="text/javascript"> | |
| let wasmInstance; | |
| async function main() { | |
| const wasmResponse = await fetch("./bigbox.wasm"); | |
| const wasmBuffer = await wasmResponse.arrayBuffer(); | |
| const wasmResult = await WebAssembly.instantiate(wasmBuffer); | |
| wasmInstance = wasmResult.instance; | |
| } | |
| main(); | |
| function updateView() { | |
| document.getElementById("wasmsize").innerText = wasmInstance.exports.memory.buffer.byteLength; | |
| } | |
| const registry = new FinalizationRegistry(({ ptr, len }) => { | |
| if (ptr) wasmInstance.exports.free_big_box(ptr); | |
| let s = ptr ? `Wasm object at ${ptr}` : `ArrayBuffer with length ${len}`; | |
| updateView(); | |
| const time = new Date().toLocaleString(undefined, { hour: "numeric", minute: "numeric", second: "numeric", fractionalSecondDigits: 3 }); | |
| document.getElementById("collected").innerHTML = `<li>${time} - ${s}</li>` + document.getElementById("collected").innerHTML; | |
| }); | |
| function createBigBox(len) { | |
| if (!wasmInstance) { | |
| alert("Please wait for the wasm instance to finish loading"); | |
| return; | |
| } | |
| const ptr = wasmInstance.exports.make_big_box(len); | |
| const obj = { _inner: ptr }; | |
| registry.register(obj, { ptr }); | |
| updateView(); | |
| return obj; | |
| } | |
| function createBigArrayBuffer(len) { | |
| const buffer = new ArrayBuffer(len); | |
| registry.register(buffer, { len }); | |
| } | |
| window.ablen = 1000000; | |
| </script> | |
| <p> | |
| Total WASM linear memory length: <span id="wasmsize"></span> | |
| </p> | |
| <p> | |
| <button onclick="createBigBox(1000000)">Make New 1MB Wasm Object</button> | |
| </p> | |
| <p> | |
| <button onclick="window.ablen++; createBigArrayBuffer(window.ablen)">Make New 1MB ArrayBuffer</button> | |
| </p> | |
| <p> | |
| Objects collected: | |
| <ul id="collected"></ul> | |
| </p> |
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