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2219387eaf
This was reverted because it was breaking some builds, and because of incorrect error code usage. Since the CL was large and contained many different things, I'm resubmitting it in pieces. This portion is NFC, and consists of: 1) Renaming classes to follow a consistent naming convention. 2) Fixing the const-ness of the interface methods. 3) Adding detailed doxygen comments. 4) Fixing a few instances of passing `const BinaryStream& X`. These are now passed as `BinaryStreamRef X`. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296394 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
//===- StringTable.cpp - PDB String Table -----------------------*- 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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#include "llvm/DebugInfo/PDB/Native/StringTable.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/MSF/BinaryStreamReader.h"
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#include "llvm/DebugInfo/PDB/Native/Hash.h"
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#include "llvm/DebugInfo/PDB/Native/RawError.h"
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#include "llvm/DebugInfo/PDB/Native/RawTypes.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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using namespace llvm::pdb;
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StringTable::StringTable() : Signature(0), HashVersion(0), NameCount(0) {}
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Error StringTable::load(BinaryStreamReader &Stream) {
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const StringTableHeader *H;
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if (auto EC = Stream.readObject(H))
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return EC;
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if (H->Signature != StringTableSignature)
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return make_error<RawError>(raw_error_code::corrupt_file,
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"Invalid hash table signature");
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if (H->HashVersion != 1 && H->HashVersion != 2)
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return make_error<RawError>(raw_error_code::corrupt_file,
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"Unsupported hash version");
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Signature = H->Signature;
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HashVersion = H->HashVersion;
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if (auto EC = Stream.readStreamRef(NamesBuffer, H->ByteSize))
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return joinErrors(std::move(EC),
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make_error<RawError>(raw_error_code::corrupt_file,
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"Invalid hash table byte length"));
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const support::ulittle32_t *HashCount;
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if (auto EC = Stream.readObject(HashCount))
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return EC;
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if (auto EC = Stream.readArray(IDs, *HashCount))
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return joinErrors(std::move(EC),
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make_error<RawError>(raw_error_code::corrupt_file,
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"Could not read bucket array"));
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if (Stream.bytesRemaining() < sizeof(support::ulittle32_t))
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return make_error<RawError>(raw_error_code::corrupt_file,
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"Missing name count");
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if (auto EC = Stream.readInteger(NameCount, llvm::support::little))
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return EC;
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return Error::success();
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}
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StringRef StringTable::getStringForID(uint32_t ID) const {
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if (ID == IDs[0])
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return StringRef();
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// NamesBuffer is a buffer of null terminated strings back to back. ID is
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// the starting offset of the string we're looking for. So just seek into
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// the desired offset and a read a null terminated stream from that offset.
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StringRef Result;
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BinaryStreamReader NameReader(NamesBuffer);
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NameReader.setOffset(ID);
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if (auto EC = NameReader.readCString(Result))
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consumeError(std::move(EC));
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return Result;
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}
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uint32_t StringTable::getIDForString(StringRef Str) const {
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uint32_t Hash = (HashVersion == 1) ? hashStringV1(Str) : hashStringV2(Str);
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size_t Count = IDs.size();
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uint32_t Start = Hash % Count;
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for (size_t I = 0; I < Count; ++I) {
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// The hash is just a starting point for the search, but if it
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// doesn't work we should find the string no matter what, because
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// we iterate the entire array.
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uint32_t Index = (Start + I) % Count;
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uint32_t ID = IDs[Index];
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StringRef S = getStringForID(ID);
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if (S == Str)
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return ID;
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}
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// IDs[0] contains the ID of the "invalid" entry.
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return IDs[0];
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}
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FixedStreamArray<support::ulittle32_t> StringTable::name_ids() const {
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return IDs;
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}
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