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script: Stop reallocating so much when converting DOM strings to JS

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values.

`size_hint()` in `utf16_units()` seems busted, so we do it ourselves.
This commit is contained in:
Patrick Walton 2015-08-02 17:34:17 -07:00
parent 9523283c14
commit f2f91886ee
1 changed files with 2 additions and 1 deletions
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3
components/script/dom/bindings/conversions.rs
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@ -394,8 +394,9 @@ impl<T: Float + FromJSValConvertible<Config=()>> FromJSValConvertible for Finite
impl ToJSValConvertible for str {
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
let mut string_utf16: Vec<u16> = Vec::with_capacity(self.len());
unsafe {
let string_utf16: Vec<u16> = self.utf16_units().collect();
string_utf16.extend(self.utf16_units());
let jsstr = JS_NewUCStringCopyN(cx, string_utf16.as_ptr() as *const i16,
string_utf16.len() as libc::size_t);
if jsstr.is_null() {