| 1 | //===-- llvm/Support/DJB.h ---DJB Hash --------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file contains support for the DJ Bernstein hash function. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #ifndef LLVM_SUPPORT_DJB_H |
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| 14 | #define LLVM_SUPPORT_DJB_H |
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| 15 | |
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| 16 | #include "llvm/ADT/StringRef.h" |
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| 17 | |
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| 18 | namespace llvm { |
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| 19 | |
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| 20 | /// The Bernstein hash function used by the DWARF accelerator tables. |
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| 21 | inline uint32_t djbHash(StringRef Buffer, uint32_t H = 5381) { |
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| 22 | for (unsigned char C : Buffer.bytes()) |
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| 23 | H = (H << 5) + H + C; |
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| 24 | return H; |
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| 25 | } |
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| 26 | |
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| 27 | /// Computes the Bernstein hash after folding the input according to the Dwarf 5 |
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| 28 | /// standard case folding rules. |
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| 29 | uint32_t caseFoldingDjbHash(StringRef Buffer, uint32_t H = 5381); |
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| 30 | } // namespace llvm |
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| 31 | |
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| 32 | #endif // LLVM_SUPPORT_DJB_H |
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| 33 | |
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