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compiler: Precisely name units of object size

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Co-authored-by: Ralf Jung <post@ralfj.de>
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Jubilee 2024-09-21 07:54:54 -07:00 committed by GitHub
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1 changed files with 3 additions and 3 deletions
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compiler/rustc_abi/src/lib.rs
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@ -337,15 +337,15 @@ pub fn parse_from_llvm_datalayout_string<'a>(
Ok(dl)
}
/// Returns **exclusive** upper bound on object size.
/// Returns **exclusive** upper bound on object size in bytes.
///
/// The theoretical maximum object size is defined as the maximum positive `isize` value.
/// This ensures that the `offset` semantics remain well-defined by allowing it to correctly
/// index every address within an object along with one byte past the end, along with allowing
/// `isize` to store the difference between any two pointers into an object.
///
/// LLVM uses a 64-bit integer to represent object size in bits, but we care only for bytes,
/// so we adopt such a more-constrained address space due to its technical limitations.
/// LLVM uses a 64-bit integer to represent object size in *bits*, but we care only for bytes,
/// so we adopt such a more-constrained size bound due to its technical limitations.
#[inline]
pub fn obj_size_bound(&self) -> u64 {
match self.pointer_size.bits() {