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[PDB] Move PDB functions to a separate file.
We are going to use the hash functions from TPI streams. Differential Revision: http://reviews.llvm.org/D21142 llvm-svn: 272223
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include/llvm/DebugInfo/PDB/Raw/Hash.h
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22
include/llvm/DebugInfo/PDB/Raw/Hash.h
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@ -0,0 +1,22 @@
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//===- Hash.h - PDB hash functions ------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGINFO_PDB_RAW_HASH_H
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#define LLVM_DEBUGINFO_PDB_RAW_HASH_H
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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namespace pdb {
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uint32_t HashStringV1(StringRef Str);
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uint32_t HashStringV2(StringRef Str);
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}
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}
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#endif
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@ -30,6 +30,7 @@ endif()
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add_pdb_impl_folder(Raw
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Raw/DbiStream.cpp
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Raw/EnumTables.cpp
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Raw/Hash.cpp
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Raw/IndexedStreamData.cpp
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Raw/InfoStream.cpp
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Raw/MappedBlockStream.cpp
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77
lib/DebugInfo/PDB/Raw/Hash.cpp
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77
lib/DebugInfo/PDB/Raw/Hash.cpp
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//===- Hash.cpp - PDB Hash Functions --------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/PDB/Raw/Hash.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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using namespace llvm::support;
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// Corresponds to `Hasher::lhashPbCb` in PDB/include/misc.h.
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// Used for name hash table and TPI/IPI hashes.
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uint32_t pdb::HashStringV1(StringRef Str) {
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uint32_t Result = 0;
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uint32_t Size = Str.size();
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ArrayRef<ulittle32_t> Longs(reinterpret_cast<const ulittle32_t *>(Str.data()),
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Size / 4);
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for (auto Value : Longs)
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Result ^= Value;
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const uint8_t *Remainder = reinterpret_cast<const uint8_t *>(Longs.end());
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uint32_t RemainderSize = Size % 4;
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// Maximum of 3 bytes left. Hash a 2 byte word if possible, then hash the
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// possibly remaining 1 byte.
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if (RemainderSize >= 2) {
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uint16_t Value = *reinterpret_cast<const ulittle16_t *>(Remainder);
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Result ^= static_cast<uint32_t>(Value);
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Remainder += 2;
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RemainderSize -= 2;
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}
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// hash possible odd byte
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if (RemainderSize == 1) {
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Result ^= *(Remainder++);
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}
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const uint32_t toLowerMask = 0x20202020;
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Result |= toLowerMask;
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Result ^= (Result >> 11);
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return Result ^ (Result >> 16);
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}
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// Corresponds to `HasherV2::HashULONG` in PDB/include/misc.h.
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// Used for name hash table.
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uint32_t pdb::HashStringV2(StringRef Str) {
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uint32_t Hash = 0xb170a1bf;
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ArrayRef<char> Buffer(Str.begin(), Str.end());
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ArrayRef<ulittle32_t> Items(
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reinterpret_cast<const ulittle32_t *>(Buffer.data()),
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Buffer.size() / sizeof(ulittle32_t));
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for (ulittle32_t Item : Items) {
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Hash += Item;
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Hash += (Hash << 10);
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Hash ^= (Hash >> 6);
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}
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Buffer = Buffer.slice(Items.size() * sizeof(ulittle32_t));
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for (uint8_t Item : Buffer) {
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Hash += Item;
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Hash += (Hash << 10);
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Hash ^= (Hash >> 6);
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}
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return Hash * 1664525L + 1013904223L;
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}
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@ -11,6 +11,7 @@
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/CodeView/StreamReader.h"
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#include "llvm/DebugInfo/PDB/Raw/Hash.h"
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#include "llvm/DebugInfo/PDB/Raw/RawError.h"
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#include "llvm/Support/Endian.h"
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@ -18,65 +19,6 @@ using namespace llvm;
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using namespace llvm::support;
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using namespace llvm::pdb;
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// Corresponds to `Hasher::lhashPbCb` in PDB/include/misc.h.
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static inline uint32_t HashStringV1(StringRef Str) {
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uint32_t Result = 0;
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uint32_t Size = Str.size();
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ArrayRef<ulittle32_t> Longs(reinterpret_cast<const ulittle32_t *>(Str.data()),
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Size / 4);
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for (auto Value : Longs)
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Result ^= Value;
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const uint8_t *Remainder = reinterpret_cast<const uint8_t *>(Longs.end());
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uint32_t RemainderSize = Size - Longs.size() * 4;
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// Maximum of 3 bytes left. Hash a 2 byte word if possible, then hash the
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// possibly remaining 1 byte.
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if (RemainderSize >= 2) {
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uint16_t Value = *reinterpret_cast<const ulittle16_t *>(Remainder);
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Result ^= static_cast<uint32_t>(Value);
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Remainder += 2;
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RemainderSize -= 2;
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}
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// hash possible odd byte
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if (RemainderSize == 1) {
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Result ^= *(Remainder++);
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}
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const uint32_t toLowerMask = 0x20202020;
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Result |= toLowerMask;
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Result ^= (Result >> 11);
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return Result ^ (Result >> 16);
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}
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// Corresponds to `HasherV2::HashULONG` in PDB/include/misc.h.
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static inline uint32_t HashStringV2(StringRef Str) {
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uint32_t Hash = 0xb170a1bf;
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ArrayRef<char> Buffer(Str.begin(), Str.end());
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ArrayRef<ulittle32_t> Items(
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reinterpret_cast<const ulittle32_t *>(Buffer.data()),
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Buffer.size() / sizeof(ulittle32_t));
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for (ulittle32_t Item : Items) {
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Hash += Item;
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Hash += (Hash << 10);
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Hash ^= (Hash >> 6);
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}
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Buffer = Buffer.slice(Items.size() * sizeof(ulittle32_t));
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for (uint8_t Item : Buffer) {
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Hash += Item;
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Hash += (Hash << 10);
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Hash ^= (Hash >> 6);
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}
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return Hash * 1664525L + 1013904223L;
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}
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NameHashTable::NameHashTable() : Signature(0), HashVersion(0), NameCount(0) {}
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Error NameHashTable::load(codeview::StreamReader &Stream) {
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