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//===- SymbolDeserializer.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_SYMBOLDESERIALIZER_H
#define LLVM_DEBUGINFO_CODEVIEW_SYMBOLDESERIALIZER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/DebugInfo/CodeView/SymbolRecordMapping.h"
#include "llvm/DebugInfo/CodeView/SymbolVisitorCallbacks.h"
#include "llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/Error.h"
namespace llvm {
namespace codeview {
class SymbolVisitorDelegate;
class SymbolDeserializer : public SymbolVisitorCallbacks {
struct MappingInfo {
MappingInfo(ArrayRef<uint8_t> RecordData, CodeViewContainer Container)
: Stream(RecordData, llvm::support::little), Reader(Stream),
Mapping(Reader, Container) {}
BinaryByteStream Stream;
BinaryStreamReader Reader;
SymbolRecordMapping Mapping;
};
public:
template <typename T> static Error deserializeAs(CVSymbol Symbol, T &Record) {
// If we're just deserializing one record, then don't worry about alignment
// as there's nothing that comes after.
SymbolDeserializer S(nullptr, CodeViewContainer::ObjectFile);
if (auto EC = S.visitSymbolBegin(Symbol))
return EC;
if (auto EC = S.visitKnownRecord(Symbol, Record))
return EC;
if (auto EC = S.visitSymbolEnd(Symbol))
return EC;
return Error::success();
}
template <typename T> static Expected<T> deserializeAs(CVSymbol Symbol) {
T Record(static_cast<SymbolRecordKind>(Symbol.kind()));
if (auto EC = deserializeAs<T>(Symbol, Record))
return std::move(EC);
return Record;
}
explicit SymbolDeserializer(SymbolVisitorDelegate *Delegate,
CodeViewContainer Container)
: Delegate(Delegate), Container(Container) {}
Error visitSymbolBegin(CVSymbol &Record, uint32_t Offset) override {
return visitSymbolBegin(Record);
}
Error visitSymbolBegin(CVSymbol &Record) override {
assert(!Mapping && "Already in a symbol mapping!");
Mapping = std::make_unique<MappingInfo>(Record.content(), Container);
return Mapping->Mapping.visitSymbolBegin(Record);
}
Error visitSymbolEnd(CVSymbol &Record) override {
assert(Mapping && "Not in a symbol mapping!");
auto EC = Mapping->Mapping.visitSymbolEnd(Record);
Mapping.reset();
return EC;
}
#define SYMBOL_RECORD(EnumName, EnumVal, Name) \
Error visitKnownRecord(CVSymbol &CVR, Name &Record) override { \
return visitKnownRecordImpl(CVR, Record); \
}
#define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#include "llvm/DebugInfo/CodeView/CodeViewSymbols.def"
private:
template <typename T> Error visitKnownRecordImpl(CVSymbol &CVR, T &Record) {
Record.RecordOffset =
Delegate ? Delegate->getRecordOffset(Mapping->Reader) : 0;
if (auto EC = Mapping->Mapping.visitKnownRecord(CVR, Record))
return EC;
return Error::success();
}
SymbolVisitorDelegate *Delegate;
CodeViewContainer Container;
std::unique_ptr<MappingInfo> Mapping;
};
}
}
#endif
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