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feat(c-api) Transmute boxed vecs to Vec<Option<Box<T>>> when deleting.

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It's a safer way to handle partially uninitialized boxed vector, since
it protects against based deletion for every item.
This commit is contained in:
Ivan Enderlin
2020-12-18 11:40:27 +01:00
parent 51fe219efb
commit a68a1e67f4
1 changed files with 1 additions and 7 deletions
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8
lib/c-api/src/wasm_c_api/macros.rs
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@@ -345,13 +345,7 @@ See the [`wasm_" $name "_vec_t`] type to get an example."]
if let Some(vec) = ptr {
if !vec.data.is_null() {
let data: Vec<*mut [<wasm_ $name _t>]> = Vec::from_raw_parts(vec.data, vec.size, vec.size);
// If the vector has been initialized (we check
// only the first item), we can transmute items to
// `Box`es.
if vec.size > 0 && !data[0].is_null() {
let _data: Vec<Box<[<wasm_ $name _t>]>> = ::std::mem::transmute(data);
}
let _data: Vec<Option<Box<[<wasm_ $name _t>]>>> = ::std::mem::transmute(data);
vec.data = ::std::ptr::null_mut();
vec.size = 0;