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//===- DebugSubsectionRecord.cpp -----------------------------*- C++-*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
#include "llvm/DebugInfo/CodeView/DebugSubsection.h"
#include "llvm/Support/BinaryStreamReader.h"
using namespace llvm;
using namespace llvm::codeview;
DebugSubsectionRecord::DebugSubsectionRecord()
: Container(CodeViewContainer::ObjectFile),
Kind(DebugSubsectionKind::None) {}
DebugSubsectionRecord::DebugSubsectionRecord(DebugSubsectionKind Kind,
BinaryStreamRef Data,
CodeViewContainer Container)
: Container(Container), Kind(Kind), Data(Data) {}
Error DebugSubsectionRecord::initialize(BinaryStreamRef Stream,
DebugSubsectionRecord &Info,
CodeViewContainer Container) {
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.Container = Container;
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, CodeViewContainer Container)
: Subsection(std::move(Subsection)), Container(Container) {}
uint32_t DebugSubsectionRecordBuilder::calculateSerializedLength() {
// The length of the entire subsection is always padded to 4 bytes, regardless
// of the container kind.
uint32_t Size = sizeof(DebugSubsectionHeader) +
alignTo(Subsection->calculateSerializedSize(), 4);
return Size;
}
Error DebugSubsectionRecordBuilder::commit(BinaryStreamWriter &Writer) const {
assert(Writer.getOffset() % alignOf(Container) == 0 &&
"Debug Subsection not properly aligned");
DebugSubsectionHeader Header;
Header.Kind = uint32_t(Subsection->kind());
// The value written into the Header's Length field is only padded to the
// container's alignment
Header.Length =
alignTo(Subsection->calculateSerializedSize(), alignOf(Container));
if (auto EC = Writer.writeObject(Header))
return EC;
if (auto EC = Subsection->commit(Writer))
return EC;
if (auto EC = Writer.padToAlignment(4))
return EC;
return Error::success();
}
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