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//===- RecordIterator.h -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
#define LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/Optional.h"
#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamRef.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Error.h"
#include <cstdint>
namespace llvm {
namespace codeview {
template <typename Kind> class CVRecord {
public:
CVRecord() : Type(static_cast<Kind>(0)) {}
CVRecord(Kind K, ArrayRef<uint8_t> Data) : Type(K), RecordData(Data) {}
bool valid() const { return Type != static_cast<Kind>(0); }
uint32_t length() const { return RecordData.size(); }
Kind kind() const { return Type; }
ArrayRef<uint8_t> data() const { return RecordData; }
StringRef str_data() const {
return StringRef(reinterpret_cast<const char *>(RecordData.data()),
RecordData.size());
}
ArrayRef<uint8_t> content() const {
return RecordData.drop_front(sizeof(RecordPrefix));
}
Optional<uint32_t> hash() const { return Hash; }
void setHash(uint32_t Value) { Hash = Value; }
Kind Type;
ArrayRef<uint8_t> RecordData;
Optional<uint32_t> Hash;
};
template <typename Kind> struct RemappedRecord {
explicit RemappedRecord(const CVRecord<Kind> &R) : OriginalRecord(R) {}
CVRecord<Kind> OriginalRecord;
SmallVector<std::pair<uint32_t, TypeIndex>, 8> Mappings;
};
template <typename Record, typename Func>
Error forEachCodeViewRecord(ArrayRef<uint8_t> StreamBuffer, Func F) {
while (!StreamBuffer.empty()) {
if (StreamBuffer.size() < sizeof(RecordPrefix))
return make_error<CodeViewError>(cv_error_code::corrupt_record);
const RecordPrefix *Prefix =
reinterpret_cast<const RecordPrefix *>(StreamBuffer.data());
size_t RealLen = Prefix->RecordLen + 2;
if (StreamBuffer.size() < RealLen)
return make_error<CodeViewError>(cv_error_code::corrupt_record);
ArrayRef<uint8_t> Data = StreamBuffer.take_front(RealLen);
StreamBuffer = StreamBuffer.drop_front(RealLen);
Record R(static_cast<decltype(Record::Type)>((uint16_t)Prefix->RecordKind),
Data);
if (auto EC = F(R))
return EC;
}
return Error::success();
}
/// Read a complete record from a stream at a random offset.
template <typename Kind>
inline Expected<CVRecord<Kind>> readCVRecordFromStream(BinaryStreamRef Stream,
uint32_t Offset) {
const RecordPrefix *Prefix = nullptr;
BinaryStreamReader Reader(Stream);
Reader.setOffset(Offset);
if (auto EC = Reader.readObject(Prefix))
return std::move(EC);
if (Prefix->RecordLen < 2)
return make_error<CodeViewError>(cv_error_code::corrupt_record);
Kind K = static_cast<Kind>(uint16_t(Prefix->RecordKind));
Reader.setOffset(Offset);
ArrayRef<uint8_t> RawData;
if (auto EC = Reader.readBytes(RawData, Prefix->RecordLen + sizeof(uint16_t)))
return std::move(EC);
return codeview::CVRecord<Kind>(K, RawData);
}
} // end namespace codeview
template <typename Kind>
struct VarStreamArrayExtractor<codeview::CVRecord<Kind>> {
Error operator()(BinaryStreamRef Stream, uint32_t &Len,
codeview::CVRecord<Kind> &Item) {
auto ExpectedRec = codeview::readCVRecordFromStream<Kind>(Stream, 0);
if (!ExpectedRec)
return ExpectedRec.takeError();
Item = *ExpectedRec;
Len = ExpectedRec->length();
return Error::success();
}
};
} // end namespace llvm
#endif // LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
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