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//===- PublicsStream.cpp - PDB Public Symbol Stream -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// The data structures defined in this file are based on the reference
// implementation which is available at
// https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.h
//
// When you are reading the reference source code, you'd find the
// information below useful.
//
// - ppdb1->m_fMinimalDbgInfo seems to be always true.
// - SMALLBUCKETS macro is defined.
//
// The reference doesn't compile, so I learned just by reading code.
// It's not guaranteed to be correct.
//
//===----------------------------------------------------------------------===//
#include "GSI.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
#include "llvm/DebugInfo/MSF/StreamReader.h"
#include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
#include "llvm/DebugInfo/PDB/Raw/PublicsStream.h"
#include "llvm/DebugInfo/PDB/Raw/RawError.h"
#include "llvm/DebugInfo/PDB/Raw/SymbolStream.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cstdint>
using namespace llvm;
using namespace llvm::msf;
using namespace llvm::support;
using namespace llvm::pdb;
// This is PSGSIHDR struct defined in
// https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.h
struct PublicsStream::HeaderInfo {
ulittle32_t SymHash;
ulittle32_t AddrMap;
ulittle32_t NumThunks;
ulittle32_t SizeOfThunk;
ulittle16_t ISectThunkTable;
char Padding[2];
ulittle32_t OffThunkTable;
ulittle32_t NumSections;
};
PublicsStream::PublicsStream(PDBFile &File,
std::unique_ptr<MappedBlockStream> Stream)
: Pdb(File), Stream(std::move(Stream)) {}
PublicsStream::~PublicsStream() = default;
uint32_t PublicsStream::getSymHash() const { return Header->SymHash; }
uint32_t PublicsStream::getAddrMap() const { return Header->AddrMap; }
// Publics stream contains fixed-size headers and a serialized hash table.
// This implementation is not complete yet. It reads till the end of the
// stream so that we verify the stream is at least not corrupted. However,
// we skip over the hash table which we believe contains information about
// public symbols.
Error PublicsStream::reload() {
StreamReader Reader(*Stream);
// Check stream size.
if (Reader.bytesRemaining() < sizeof(HeaderInfo) + sizeof(GSIHashHeader))
return make_error<RawError>(raw_error_code::corrupt_file,
"Publics Stream does not contain a header.");
// Read PSGSIHDR and GSIHashHdr structs.
if (Reader.readObject(Header))
return make_error<RawError>(raw_error_code::corrupt_file,
"Publics Stream does not contain a header.");
if (auto EC = readGSIHashHeader(HashHdr, Reader))
return EC;
if (auto EC = readGSIHashRecords(HashRecords, HashHdr, Reader))
return EC;
if (auto EC = readGSIHashBuckets(HashBuckets, HashHdr, Reader))
return EC;
NumBuckets = HashBuckets.size();
// Something called "address map" follows.
uint32_t NumAddressMapEntries = Header->AddrMap / sizeof(uint32_t);
if (auto EC = Reader.readArray(AddressMap, NumAddressMapEntries))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Could not read an address map."));
// Something called "thunk map" follows.
if (auto EC = Reader.readArray(ThunkMap, Header->NumThunks))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Could not read a thunk map."));
// Something called "section map" follows.
if (auto EC = Reader.readArray(SectionOffsets, Header->NumSections))
return joinErrors(std::move(EC),
make_error<RawError>(raw_error_code::corrupt_file,
"Could not read a section map."));
if (Reader.bytesRemaining() > 0)
return make_error<RawError>(raw_error_code::corrupt_file,
"Corrupted publics stream.");
return Error::success();
}
iterator_range<codeview::CVSymbolArray::Iterator>
PublicsStream::getSymbols(bool *HadError) const {
auto SymbolS = Pdb.getPDBSymbolStream();
if (SymbolS.takeError()) {
codeview::CVSymbolArray::Iterator Iter;
return make_range(Iter, Iter);
}
SymbolStream &SS = SymbolS.get();
return SS.getSymbols(HadError);
}
Error PublicsStream::commit() { return Error::success(); }
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