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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
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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