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