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c8ec2e99bb
There's some abstraction overhead in the underlying mechanisms that were being used, and it was leading to an abundance of small but not-free copies being made. This showed up on a profile. Eliminating this and going back to a low-level byte-based implementation speeds up lld with /DEBUG between 10 and 15%. Differential Revision: https://reviews.llvm.org/D42148 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@322871 91177308-0d34-0410-b5e6-96231b3b80d8
127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
//===- RecordIterator.h -----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
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#define LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/DebugInfo/CodeView/CodeViewError.h"
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#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
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#include "llvm/DebugInfo/CodeView/TypeIndex.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/BinaryStreamRef.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include <cstdint>
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namespace llvm {
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namespace codeview {
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template <typename Kind> class CVRecord {
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public:
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CVRecord() : Type(static_cast<Kind>(0)) {}
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CVRecord(Kind K, ArrayRef<uint8_t> Data) : Type(K), RecordData(Data) {}
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bool valid() const { return Type != static_cast<Kind>(0); }
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uint32_t length() const { return RecordData.size(); }
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Kind kind() const { return Type; }
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ArrayRef<uint8_t> data() const { return RecordData; }
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StringRef str_data() const {
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return StringRef(reinterpret_cast<const char *>(RecordData.data()),
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RecordData.size());
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}
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ArrayRef<uint8_t> content() const {
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return RecordData.drop_front(sizeof(RecordPrefix));
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}
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Optional<uint32_t> hash() const { return Hash; }
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void setHash(uint32_t Value) { Hash = Value; }
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Kind Type;
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ArrayRef<uint8_t> RecordData;
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Optional<uint32_t> Hash;
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};
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template <typename Kind> struct RemappedRecord {
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explicit RemappedRecord(const CVRecord<Kind> &R) : OriginalRecord(R) {}
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CVRecord<Kind> OriginalRecord;
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SmallVector<std::pair<uint32_t, TypeIndex>, 8> Mappings;
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};
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template <typename Record, typename Func>
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Error forEachCodeViewRecord(ArrayRef<uint8_t> StreamBuffer, Func F) {
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while (!StreamBuffer.empty()) {
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if (StreamBuffer.size() < sizeof(RecordPrefix))
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return make_error<CodeViewError>(cv_error_code::corrupt_record);
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const RecordPrefix *Prefix =
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reinterpret_cast<const RecordPrefix *>(StreamBuffer.data());
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uint16_t RealLen = Prefix->RecordLen + 2;
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if (StreamBuffer.size() < RealLen)
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return make_error<CodeViewError>(cv_error_code::corrupt_record);
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ArrayRef<uint8_t> Data = StreamBuffer.take_front(RealLen);
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StreamBuffer = StreamBuffer.drop_front(RealLen);
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Record R(static_cast<decltype(Record::Type)>((uint16_t)Prefix->RecordKind),
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Data);
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if (auto EC = F(R))
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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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/// Read a complete record from a stream at a random offset.
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template <typename Kind>
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inline Expected<CVRecord<Kind>> readCVRecordFromStream(BinaryStreamRef Stream,
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uint32_t Offset) {
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const RecordPrefix *Prefix = nullptr;
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BinaryStreamReader Reader(Stream);
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Reader.setOffset(Offset);
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if (auto EC = Reader.readObject(Prefix))
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return std::move(EC);
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if (Prefix->RecordLen < 2)
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return make_error<CodeViewError>(cv_error_code::corrupt_record);
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Kind K = static_cast<Kind>(uint16_t(Prefix->RecordKind));
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Reader.setOffset(Offset);
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ArrayRef<uint8_t> RawData;
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if (auto EC = Reader.readBytes(RawData, Prefix->RecordLen + sizeof(uint16_t)))
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return std::move(EC);
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return codeview::CVRecord<Kind>(K, RawData);
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}
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} // end namespace codeview
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template <typename Kind>
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struct VarStreamArrayExtractor<codeview::CVRecord<Kind>> {
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Error operator()(BinaryStreamRef Stream, uint32_t &Len,
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codeview::CVRecord<Kind> &Item) {
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auto ExpectedRec = codeview::readCVRecordFromStream<Kind>(Stream, 0);
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if (!ExpectedRec)
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return ExpectedRec.takeError();
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Item = *ExpectedRec;
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Len = ExpectedRec->length();
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return Error::success();
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}
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};
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} // end namespace llvm
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#endif // LLVM_DEBUGINFO_CODEVIEW_RECORDITERATOR_H
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