116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
//===- DebugChecksumsSubsection.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/DebugChecksumsSubsection.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.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/Endian.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/MathExtras.h"
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#include <cassert>
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#include <cstdint>
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#include <cstring>
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using namespace llvm;
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using namespace llvm::codeview;
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struct FileChecksumEntryHeader {
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using ulittle32_t = support::ulittle32_t;
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ulittle32_t FileNameOffset; // Byte offset of filename in global string table.
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uint8_t ChecksumSize; // Number of bytes of checksum.
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uint8_t ChecksumKind; // FileChecksumKind
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// Checksum bytes follow.
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};
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Error VarStreamArrayExtractor<FileChecksumEntry>::
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operator()(BinaryStreamRef Stream, uint32_t &Len, FileChecksumEntry &Item) {
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BinaryStreamReader Reader(Stream);
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const FileChecksumEntryHeader *Header;
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if (auto EC = Reader.readObject(Header))
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return EC;
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Item.FileNameOffset = Header->FileNameOffset;
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Item.Kind = static_cast<FileChecksumKind>(Header->ChecksumKind);
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if (auto EC = Reader.readBytes(Item.Checksum, Header->ChecksumSize))
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return EC;
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Len = alignTo(Header->ChecksumSize + sizeof(FileChecksumEntryHeader), 4);
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return Error::success();
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}
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Error DebugChecksumsSubsectionRef::initialize(BinaryStreamReader Reader) {
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if (auto EC = Reader.readArray(Checksums, Reader.bytesRemaining()))
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return EC;
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return Error::success();
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}
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Error DebugChecksumsSubsectionRef::initialize(BinaryStreamRef Section) {
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BinaryStreamReader Reader(Section);
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return initialize(Reader);
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}
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DebugChecksumsSubsection::DebugChecksumsSubsection(
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DebugStringTableSubsection &Strings)
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: DebugSubsection(DebugSubsectionKind::FileChecksums), Strings(Strings) {}
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void DebugChecksumsSubsection::addChecksum(StringRef FileName,
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FileChecksumKind Kind,
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ArrayRef<uint8_t> Bytes) {
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FileChecksumEntry Entry;
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if (!Bytes.empty()) {
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uint8_t *Copy = Storage.Allocate<uint8_t>(Bytes.size());
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::memcpy(Copy, Bytes.data(), Bytes.size());
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Entry.Checksum = makeArrayRef(Copy, Bytes.size());
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}
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Entry.FileNameOffset = Strings.insert(FileName);
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Entry.Kind = Kind;
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Checksums.push_back(Entry);
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// This maps the offset of this string in the string table to the offset
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// of this checksum entry in the checksum buffer.
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OffsetMap[Entry.FileNameOffset] = SerializedSize;
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assert(SerializedSize % 4 == 0);
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uint32_t Len = alignTo(sizeof(FileChecksumEntryHeader) + Bytes.size(), 4);
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SerializedSize += Len;
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}
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uint32_t DebugChecksumsSubsection::calculateSerializedSize() const {
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return SerializedSize;
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}
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Error DebugChecksumsSubsection::commit(BinaryStreamWriter &Writer) const {
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for (const auto &FC : Checksums) {
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FileChecksumEntryHeader Header;
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Header.ChecksumKind = uint8_t(FC.Kind);
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Header.ChecksumSize = FC.Checksum.size();
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Header.FileNameOffset = FC.FileNameOffset;
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if (auto EC = Writer.writeObject(Header))
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return EC;
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if (auto EC = Writer.writeArray(makeArrayRef(FC.Checksum)))
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return EC;
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if (auto EC = Writer.padToAlignment(4))
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return EC;
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}
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return Error::success();
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}
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uint32_t DebugChecksumsSubsection::mapChecksumOffset(StringRef FileName) const {
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uint32_t Offset = Strings.getIdForString(FileName);
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auto Iter = OffsetMap.find(Offset);
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assert(Iter != OffsetMap.end());
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return Iter->second;
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}
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