Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- FDRRecordProducer.h - XRay FDR Mode Record Producer ----------------===//

//

// 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

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_XRAY_FDRRECORDPRODUCER_H

#define LLVM_XRAY_FDRRECORDPRODUCER_H

#include "llvm/Support/Error.h"

#include "llvm/XRay/FDRRecords.h"

#include "llvm/XRay/XRayRecord.h"

#include <memory>

namespace llvm {

namespace xray {

class RecordProducer {

public:

  /// All producer implementations must yield either an Error or a non-nullptr

  /// unique_ptr<Record>.

  virtual Expected<std::unique_ptr<Record>> produce() = 0;

  virtual ~RecordProducer() = default;

};

class FileBasedRecordProducer : public RecordProducer {

  const XRayFileHeader &Header;

  DataExtractor &E;

  uint64_t &OffsetPtr;

  uint32_t CurrentBufferBytes = 0;

  // Helper function which gets the next record by speculatively reading through

  // the log, finding a buffer extents record.

  Expected<std::unique_ptr<Record>> findNextBufferExtent();

public:

  FileBasedRecordProducer(const XRayFileHeader &FH, DataExtractor &DE,

                          uint64_t &OP)

      : Header(FH), E(DE), OffsetPtr(OP) {}

  /// This producer encapsulates the logic for loading a File-backed

  /// RecordProducer hidden behind a DataExtractor.

  Expected<std::unique_ptr<Record>> produce() override;

};

} // namespace xray

} // namespace llvm

#endif // LLVM_XRAY_FDRRECORDPRODUCER_H