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Assign length when creating small str

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This commit is contained in:
Brendan Hansknecht 2020-10-12 19:19:03 -07:00
parent 4e0f591f8e
commit af4c0348c6
1 changed files with 6 additions and 2 deletions
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8
roc_std/src/lib.rs
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@ -243,7 +243,7 @@ impl RocStr {
pub fn empty() -> Self { pub fn empty() -> Self {
RocStr { RocStr {
// The first bit of length is 1 to specify small str. // The first bit of length is 1 to specify small str.
length: isize::MIN as usize, length: 0,
elements: core::ptr::null_mut(), elements: core::ptr::null_mut(),
} }
} }
@ -329,6 +329,10 @@ impl RocStr {
*target_ptr.offset(index) = *source_ptr.offset(index); *target_ptr.offset(index) = *source_ptr.offset(index);
} }
} }
// Write length and small string bit to last byte of length.
let mut bytes = rocstr.length.to_ne_bytes();
bytes[bytes.len() - 1] = capacity as u8 ^ 0b1000_0000;
rocstr.length = usize::from_ne_bytes(bytes);
rocstr rocstr
} else { } else {
let ptr = slice.as_ptr(); let ptr = slice.as_ptr();
@ -382,7 +386,7 @@ impl fmt::Debug for RocStr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// RocStr { is_small_str: false, storage: Refcounted(3), elements: [ 1,2,3,4] } // RocStr { is_small_str: false, storage: Refcounted(3), elements: [ 1,2,3,4] }
f.debug_struct("RocStr") f.debug_struct("RocStr")
.field("is_small_str", &false) .field("is_small_str", &self.is_small_str())
.field("storage", &self.storage()) .field("storage", &self.storage())
.field("elements", &self.as_slice()) .field("elements", &self.as_slice())
.finish() .finish()