| //===-- llvm/Support/DJB.h ---DJB Hash --------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains support for the DJ Bernstein hash function. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_SUPPORT_DJB_H |
| #define LLVM_SUPPORT_DJB_H |
| |
| #include "llvm/ADT/StringRef.h" |
| |
| namespace llvm { |
| |
| /// The Bernstein hash function used by the DWARF accelerator tables. |
| inline uint32_t djbHash(StringRef Buffer, uint32_t H = 5381) { |
| for (unsigned char C : Buffer.bytes()) |
| H = (H << 5) + H + C; |
| return H; |
| } |
| |
| /// Computes the Bernstein hash after folding the input according to the Dwarf 5 |
| /// standard case folding rules. |
| uint32_t caseFoldingDjbHash(StringRef Buffer, uint32_t H = 5381); |
| } // namespace llvm |
| |
| #endif // LLVM_SUPPORT_DJB_H |