diff options
| -rw-r--r-- | compiler/rustc_middle/src/mir/interpret/allocation.rs | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/compiler/rustc_middle/src/mir/interpret/allocation.rs b/compiler/rustc_middle/src/mir/interpret/allocation.rs index 2f2c7b15416..7b18255f57a 100644 --- a/compiler/rustc_middle/src/mir/interpret/allocation.rs +++ b/compiler/rustc_middle/src/mir/interpret/allocation.rs @@ -109,26 +109,34 @@ const MAX_HASHED_BUFFER_LEN: usize = 2 * MAX_BYTES_TO_HASH; // large. impl hash::Hash for Allocation { fn hash<H: hash::Hasher>(&self, state: &mut H) { + let Self { + bytes, + provenance, + init_mask, + align, + mutability, + extra: _, // don't bother hashing () + } = self; + // Partially hash the `bytes` buffer when it is large. To limit collisions with common // prefixes and suffixes, we hash the length and some slices of the buffer. - let byte_count = self.bytes.len(); + let byte_count = bytes.len(); if byte_count > MAX_HASHED_BUFFER_LEN { // Hash the buffer's length. byte_count.hash(state); // And its head and tail. - self.bytes[..MAX_BYTES_TO_HASH].hash(state); - self.bytes[byte_count - MAX_BYTES_TO_HASH..].hash(state); + bytes[..MAX_BYTES_TO_HASH].hash(state); + bytes[byte_count - MAX_BYTES_TO_HASH..].hash(state); } else { - self.bytes.hash(state); + bytes.hash(state); } // Hash the other fields as usual. - self.provenance.hash(state); - self.init_mask.hash(state); - self.align.hash(state); - self.mutability.hash(state); - self.extra.hash(state); + provenance.hash(state); + init_mask.hash(state); + align.hash(state); + mutability.hash(state); } } |