95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
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//===- DebugSubsectionRecord.cpp ------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include "llvm/DebugInfo/CodeView/DebugSubsection.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/BinaryStreamWriter.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MathExtras.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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using namespace llvm;
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using namespace llvm::codeview;
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DebugSubsectionRecord::DebugSubsectionRecord() = default;
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DebugSubsectionRecord::DebugSubsectionRecord(DebugSubsectionKind Kind,
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BinaryStreamRef Data)
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: Kind(Kind), Data(Data) {}
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Error DebugSubsectionRecord::initialize(BinaryStreamRef Stream,
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DebugSubsectionRecord &Info) {
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const DebugSubsectionHeader *Header;
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BinaryStreamReader Reader(Stream);
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if (auto EC = Reader.readObject(Header))
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return EC;
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DebugSubsectionKind Kind =
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static_cast<DebugSubsectionKind>(uint32_t(Header->Kind));
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if (auto EC = Reader.readStreamRef(Info.Data, Header->Length))
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return EC;
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Info.Kind = Kind;
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return Error::success();
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}
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uint32_t DebugSubsectionRecord::getRecordLength() const {
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return sizeof(DebugSubsectionHeader) + Data.getLength();
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}
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DebugSubsectionKind DebugSubsectionRecord::kind() const { return Kind; }
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BinaryStreamRef DebugSubsectionRecord::getRecordData() const { return Data; }
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DebugSubsectionRecordBuilder::DebugSubsectionRecordBuilder(
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std::shared_ptr<DebugSubsection> Subsection)
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: Subsection(std::move(Subsection)) {}
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DebugSubsectionRecordBuilder::DebugSubsectionRecordBuilder(
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const DebugSubsectionRecord &Contents)
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: Contents(Contents) {}
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uint32_t DebugSubsectionRecordBuilder::calculateSerializedLength() const {
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uint32_t DataSize = Subsection ? Subsection->calculateSerializedSize()
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: Contents.getRecordData().getLength();
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// The length of the entire subsection is always padded to 4 bytes,
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// regardless of the container kind.
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return sizeof(DebugSubsectionHeader) + alignTo(DataSize, 4);
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}
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Error DebugSubsectionRecordBuilder::commit(BinaryStreamWriter &Writer,
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CodeViewContainer Container) const {
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assert(Writer.getOffset() % alignOf(Container) == 0 &&
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"Debug Subsection not properly aligned");
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DebugSubsectionHeader Header;
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Header.Kind = uint32_t(Subsection ? Subsection->kind() : Contents.kind());
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// The value written into the Header's Length field is only padded to the
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// container's alignment
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uint32_t DataSize = Subsection ? Subsection->calculateSerializedSize()
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: Contents.getRecordData().getLength();
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Header.Length = alignTo(DataSize, alignOf(Container));
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if (auto EC = Writer.writeObject(Header))
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return EC;
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if (Subsection) {
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if (auto EC = Subsection->commit(Writer))
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return EC;
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} else {
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if (auto EC = Writer.writeStreamRef(Contents.getRecordData()))
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return EC;
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}
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if (auto EC = Writer.padToAlignment(4))
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return EC;
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return Error::success();
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}
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