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| //===- TypeDeserializer.h ---------------------------------------*- 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_CODEVIEW_TYPEDESERIALIZER_H
#define LLVM_DEBUGINFO_CODEVIEW_TYPEDESERIALIZER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/TypeRecord.h"
#include "llvm/DebugInfo/CodeView/TypeRecordMapping.h"
#include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/Error.h"
#include <cassert>
#include <cstdint>
#include <memory>
namespace llvm {
namespace codeview {
class TypeDeserializer : public TypeVisitorCallbacks {
struct MappingInfo {
explicit MappingInfo(ArrayRef<uint8_t> RecordData)
: Stream(RecordData, llvm::support::little), Reader(Stream),
Mapping(Reader) {}
BinaryByteStream Stream;
BinaryStreamReader Reader;
TypeRecordMapping Mapping;
};
public:
TypeDeserializer() = default;
template <typename T> static Error deserializeAs(CVType &CVT, T &Record) {
Record.Kind = static_cast<TypeRecordKind>(CVT.kind());
MappingInfo I(CVT.content());
if (auto EC = I.Mapping.visitTypeBegin(CVT))
return EC;
if (auto EC = I.Mapping.visitKnownRecord(CVT, Record))
return EC;
if (auto EC = I.Mapping.visitTypeEnd(CVT))
return EC;
return Error::success();
}
template <typename T>
static Expected<T> deserializeAs(ArrayRef<uint8_t> Data) {
const RecordPrefix *Prefix =
reinterpret_cast<const RecordPrefix *>(Data.data());
TypeRecordKind K =
static_cast<TypeRecordKind>(uint16_t(Prefix->RecordKind));
T Record(K);
CVType CVT(Data);
if (auto EC = deserializeAs<T>(CVT, Record))
return std::move(EC);
return Record;
}
Error visitTypeBegin(CVType &Record) override {
assert(!Mapping && "Already in a type mapping!");
Mapping = std::make_unique<MappingInfo>(Record.content());
return Mapping->Mapping.visitTypeBegin(Record);
}
Error visitTypeBegin(CVType &Record, TypeIndex Index) override {
return visitTypeBegin(Record);
}
Error visitTypeEnd(CVType &Record) override {
assert(Mapping && "Not in a type mapping!");
auto EC = Mapping->Mapping.visitTypeEnd(Record);
Mapping.reset();
return EC;
}
#define TYPE_RECORD(EnumName, EnumVal, Name) \
Error visitKnownRecord(CVType &CVR, Name##Record &Record) override { \
return visitKnownRecordImpl<Name##Record>(CVR, Record); \
}
#define MEMBER_RECORD(EnumName, EnumVal, Name)
#define TYPE_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#define MEMBER_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#include "llvm/DebugInfo/CodeView/CodeViewTypes.def"
private:
template <typename RecordType>
Error visitKnownRecordImpl(CVType &CVR, RecordType &Record) {
return Mapping->Mapping.visitKnownRecord(CVR, Record);
}
std::unique_ptr<MappingInfo> Mapping;
};
class FieldListDeserializer : public TypeVisitorCallbacks {
struct MappingInfo {
explicit MappingInfo(BinaryStreamReader &R)
: Reader(R), Mapping(Reader), StartOffset(0) {}
BinaryStreamReader &Reader;
TypeRecordMapping Mapping;
uint32_t StartOffset;
};
public:
explicit FieldListDeserializer(BinaryStreamReader &Reader) : Mapping(Reader) {
RecordPrefix Pre(static_cast<uint16_t>(TypeLeafKind::LF_FIELDLIST));
CVType FieldList(&Pre, sizeof(Pre));
consumeError(Mapping.Mapping.visitTypeBegin(FieldList));
}
~FieldListDeserializer() override {
RecordPrefix Pre(static_cast<uint16_t>(TypeLeafKind::LF_FIELDLIST));
CVType FieldList(&Pre, sizeof(Pre));
consumeError(Mapping.Mapping.visitTypeEnd(FieldList));
}
Error visitMemberBegin(CVMemberRecord &Record) override {
Mapping.StartOffset = Mapping.Reader.getOffset();
return Mapping.Mapping.visitMemberBegin(Record);
}
Error visitMemberEnd(CVMemberRecord &Record) override {
if (auto EC = Mapping.Mapping.visitMemberEnd(Record))
return EC;
return Error::success();
}
#define TYPE_RECORD(EnumName, EnumVal, Name)
#define MEMBER_RECORD(EnumName, EnumVal, Name) \
Error visitKnownMember(CVMemberRecord &CVR, Name##Record &Record) override { \
return visitKnownMemberImpl<Name##Record>(CVR, Record); \
}
#define TYPE_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#define MEMBER_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#include "llvm/DebugInfo/CodeView/CodeViewTypes.def"
private:
template <typename RecordType>
Error visitKnownMemberImpl(CVMemberRecord &CVR, RecordType &Record) {
if (auto EC = Mapping.Mapping.visitKnownMember(CVR, Record))
return EC;
uint32_t EndOffset = Mapping.Reader.getOffset();
uint32_t RecordLength = EndOffset - Mapping.StartOffset;
Mapping.Reader.setOffset(Mapping.StartOffset);
if (auto EC = Mapping.Reader.readBytes(CVR.Data, RecordLength))
return EC;
assert(Mapping.Reader.getOffset() == EndOffset);
return Error::success();
}
MappingInfo Mapping;
};
} // end namespace codeview
} // end namespace llvm
#endif // LLVM_DEBUGINFO_CODEVIEW_TYPEDESERIALIZER_H
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