DebugSubsectionRecord.cpp
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//===- DebugSubsectionRecord.cpp ------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/DebugSubsection.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamWriter.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MathExtras.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
using namespace llvm;
using namespace llvm::codeview;
DebugSubsectionRecord::DebugSubsectionRecord() = default;
DebugSubsectionRecord::DebugSubsectionRecord(DebugSubsectionKind Kind,
BinaryStreamRef Data)
: Kind(Kind), Data(Data) {}
Error DebugSubsectionRecord::initialize(BinaryStreamRef Stream,
DebugSubsectionRecord &Info) {
const DebugSubsectionHeader *Header;
BinaryStreamReader Reader(Stream);
if (auto EC = Reader.readObject(Header))
return EC;
DebugSubsectionKind Kind =
static_cast<DebugSubsectionKind>(uint32_t(Header->Kind));
if (auto EC = Reader.readStreamRef(Info.Data, Header->Length))
return EC;
Info.Kind = Kind;
return Error::success();
}
uint32_t DebugSubsectionRecord::getRecordLength() const {
return sizeof(DebugSubsectionHeader) + Data.getLength();
}
DebugSubsectionKind DebugSubsectionRecord::kind() const { return Kind; }
BinaryStreamRef DebugSubsectionRecord::getRecordData() const { return Data; }
DebugSubsectionRecordBuilder::DebugSubsectionRecordBuilder(
std::shared_ptr<DebugSubsection> Subsection)
: Subsection(std::move(Subsection)) {}
DebugSubsectionRecordBuilder::DebugSubsectionRecordBuilder(
const DebugSubsectionRecord &Contents)
: Contents(Contents) {}
uint32_t DebugSubsectionRecordBuilder::calculateSerializedLength() const {
uint32_t DataSize = Subsection ? Subsection->calculateSerializedSize()
: Contents.getRecordData().getLength();
// The length of the entire subsection is always padded to 4 bytes,
// regardless of the container kind.
return sizeof(DebugSubsectionHeader) + alignTo(DataSize, 4);
}
Error DebugSubsectionRecordBuilder::commit(BinaryStreamWriter &Writer,
CodeViewContainer Container) const {
assert(Writer.getOffset() % alignOf(Container) == 0 &&
"Debug Subsection not properly aligned");
DebugSubsectionHeader Header;
Header.Kind = uint32_t(Subsection ? Subsection->kind() : Contents.kind());
// The value written into the Header's Length field is only padded to the
// container's alignment
uint32_t DataSize = Subsection ? Subsection->calculateSerializedSize()
: Contents.getRecordData().getLength();
Header.Length = alignTo(DataSize, alignOf(Container));
if (auto EC = Writer.writeObject(Header))
return EC;
if (Subsection) {
if (auto EC = Subsection->commit(Writer))
return EC;
} else {
if (auto EC = Writer.writeStreamRef(Contents.getRecordData()))
return EC;
}
if (auto EC = Writer.padToAlignment(4))
return EC;
return Error::success();
}