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add tests for RocStr clone

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This commit is contained in:
Folkert 2021-01-03 03:12:49 +01:00
parent 0abc1cce15
commit 6749606450
2 changed files with 24 additions and 4 deletions
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12
compiler/gen/tests/gen_str.rs
View file

@ -526,4 +526,16 @@ mod gen_str {
assert_evals_to!(r#""a" != "b""#, true, bool); assert_evals_to!(r#""a" != "b""#, true, bool);
assert_evals_to!(r#""a" == "b""#, false, bool); assert_evals_to!(r#""a" == "b""#, false, bool);
} }
#[test]
fn str_clone() {
use roc_std::RocStr;
let long = RocStr::from_slice("loremipsumdolarsitamet".as_bytes());
let short = RocStr::from_slice("x".as_bytes());
let empty = RocStr::from_slice("".as_bytes());
debug_assert_eq!(long.clone(), long);
debug_assert_eq!(short.clone(), short);
debug_assert_eq!(empty.clone(), empty);
}
} }

16
roc_std/src/lib.rs
View file

@ -443,18 +443,26 @@ impl Eq for RocStr {}
impl Clone for RocStr { impl Clone for RocStr {
fn clone(&self) -> Self { fn clone(&self) -> Self {
if self.is_small_str() { if self.is_small_str() || self.is_empty() {
Self { Self {
elements: self.elements, elements: self.elements,
length: self.length, length: self.length,
} }
} else { } else {
let capacity_size = core::mem::size_of::<usize>();
let copy_length = self.length + capacity_size;
let elements = unsafe { let elements = unsafe {
let raw = libc::malloc(self.length); let raw = libc::malloc(copy_length);
libc::memcpy(raw, self.elements as *mut libc::c_void, self.length); libc::memcpy(
raw,
self.elements.offset(-(capacity_size as isize)) as *mut libc::c_void,
copy_length,
);
raw as *mut u8 *(raw as *mut usize) = self.length;
(raw as *mut u8).add(capacity_size)
}; };
Self { Self {