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Tweak some logic in JsValue::drop

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While technically correct the current implementation sort of made it
only roundaboutedly so. Tweak the logic a bit and the associated comment
to ensure that stack values are never dropped and the global constants
are all skipped.
This commit is contained in:
Alex Crichton
2018-10-24 23:33:01 -07:00
parent f016ae5846
commit d70257af6c
1 changed files with 8 additions and 4 deletions
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12
src/lib.rs
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@ -534,10 +534,14 @@ impl Drop for JsValue {
#[inline]
fn drop(&mut self) {
unsafe {
// if the first bit is set then this is a stack value, so we for
// sure need to drop it. Otherwise if this is one of the special
// reserved values there's no need to drop it.
if (self.idx & 1) == 1 || self.idx >= JSIDX_RESERVED {
// The first bit indicates whether this is a stack value or not.
// Stack values should never be dropped (they're always in
// `ManuallyDrop`)
debug_assert!(self.idx & 1 == 0);
// We don't want to drop the first few elements as they're all
// reserved, but everything else is safe to drop.
if self.idx >= JSIDX_RESERVED {
__wbindgen_object_drop_ref(self.idx);
}
}