blob: 79c44359149cbc024915b361f7ae70031a7192c0 [file] [log] [blame]
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_HASH_H_
#define RUNTIME_VM_HASH_H_
#include "platform/globals.h"
namespace dart {
inline uint32_t CombineHashes(uint32_t hash, uint32_t other_hash) {
hash += other_hash;
hash += hash << 10;
hash ^= hash >> 6; // Logical shift, unsigned hash.
return hash;
}
inline uint32_t FinalizeHash(uint32_t hash, intptr_t hashbits = kBitsPerInt32) {
hash += hash << 3;
hash ^= hash >> 11; // Logical shift, unsigned hash.
hash += hash << 15;
if (hashbits < kBitsPerInt32) {
hash &= (static_cast<uint32_t>(1) << hashbits) - 1;
}
return (hash == 0) ? 1 : hash;
}
inline uint32_t HashBytes(const uint8_t* bytes, intptr_t size) {
uint32_t hash = size;
while (size > 0) {
hash = CombineHashes(hash, *bytes);
bytes++;
size--;
}
return hash;
}
} // namespace dart
#endif // RUNTIME_VM_HASH_H_