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//===- GlobalsStream.h - PDB Index of Symbols by Name -----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_PDB_NATIVE_GLOBALSSTREAM_H
#define LLVM_DEBUGINFO_PDB_NATIVE_GLOBALSSTREAM_H
#include "llvm/ADT/iterator.h"
#include "llvm/DebugInfo/CodeView/CVRecord.h"
#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
#include "llvm/Support/BinaryStreamArray.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
namespace llvm {
class BinaryStreamReader;
namespace msf {
class MappedBlockStream;
}
namespace pdb {
class SymbolStream;
/// Iterator over hash records producing symbol record offsets. Abstracts away
/// the fact that symbol record offsets on disk are off-by-one.
class GSIHashIterator
: public iterator_adaptor_base<
GSIHashIterator, FixedStreamArrayIterator<PSHashRecord>,
std::random_access_iterator_tag, const uint32_t> {
public:
template <typename T>
GSIHashIterator(T &&v)
: GSIHashIterator::iterator_adaptor_base(std::forward<T &&>(v)) {}
uint32_t operator*() const {
uint32_t Off = this->I->Off;
return --Off;
}
};
/// From https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.cpp
enum : unsigned { IPHR_HASH = 4096 };
/// A readonly view of a hash table used in the globals and publics streams.
/// Most clients will only want to iterate this to get symbol record offsets
/// into the PDB symbol stream.
class GSIHashTable {
public:
const GSIHashHeader *HashHdr;
FixedStreamArray<PSHashRecord> HashRecords;
FixedStreamArray<support::ulittle32_t> HashBitmap;
FixedStreamArray<support::ulittle32_t> HashBuckets;
std::array<int32_t, IPHR_HASH + 1> BucketMap;
Error read(BinaryStreamReader &Reader);
uint32_t getVerSignature() const { return HashHdr->VerSignature; }
uint32_t getVerHeader() const { return HashHdr->VerHdr; }
uint32_t getHashRecordSize() const { return HashHdr->HrSize; }
uint32_t getNumBuckets() const { return HashHdr->NumBuckets; }
typedef GSIHashHeader iterator;
GSIHashIterator begin() const { return GSIHashIterator(HashRecords.begin()); }
GSIHashIterator end() const { return GSIHashIterator(HashRecords.end()); }
};
class GlobalsStream {
public:
explicit GlobalsStream(std::unique_ptr<msf::MappedBlockStream> Stream);
~GlobalsStream();
const GSIHashTable &getGlobalsTable() const { return GlobalsTable; }
Error reload();
std::vector<std::pair<uint32_t, codeview::CVSymbol>>
findRecordsByName(StringRef Name, const SymbolStream &Symbols) const;
private:
GSIHashTable GlobalsTable;
std::unique_ptr<msf::MappedBlockStream> Stream;
};
} // namespace pdb
}
#endif
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