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Add the anyref_heap_live_count function

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This is useful for debugging and writing tests that assert various operations do
not leak `JsValue`s.
This commit is contained in:
Nick Fitzgerald
2019-05-09 12:58:20 -07:00
parent f4c5532982
commit 450c9234ad
5 changed files with 132 additions and 0 deletions
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31
crates/cli-support/src/js/mod.rs
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@ -636,6 +636,37 @@ impl<'a> Context<'a> {
))
})?;
self.bind("__wbindgen_anyref_heap_live_count", &|me| {
if me.config.anyref {
// Eventually we should add support to the anyref-xform to
// re-write calls to the imported
// `__wbindgen_anyref_heap_live_count` function into calls to
// the exported `__wbindgen_anyref_heap_live_count_impl`
// function, and to un-export that function.
//
// But for now, we just bounce wasm -> js -> wasm because it is
// easy.
Ok("function() {{ return wasm.__wbindgen_anyref_heap_live_count_impl(); }}".into())
} else {
me.expose_global_heap();
Ok(format!(
"
function() {{
let free_count = 0;
let next = heap_next;
while (next < heap.length) {{
free_count += 1;
next = heap[next];
}}
return heap.length - free_count - {} - {};
}}
",
INITIAL_HEAP_OFFSET,
INITIAL_HEAP_VALUES.len(),
))
}
})?;
self.bind("__wbindgen_debug_string", &|me| {
me.expose_pass_string_to_wasm()?;
me.expose_uint32_memory();