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40ea28492e
This is part of a larger effort to get the Stream code moved up to Support. I don't want to do it in one large patch, in part because the changes are so big that it will treat everything as file deletions and add, losing history in the process. Aside from that though, it's just a good idea in general to make small changes. So this change only changes the names of the Stream related source files, and applies necessary source fix ups. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296211 91177308-0d34-0410-b5e6-96231b3b80d8
100 lines
3.4 KiB
C++
100 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::msf;
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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(StreamReader &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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StreamReader NameReader(NamesBuffer);
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NameReader.setOffset(ID);
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if (auto EC = NameReader.readZeroString(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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