1//===- FDRRecordProducer.h - XRay FDR Mode Record Producer ----------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8#ifndef LLVM_XRAY_FDRRECORDPRODUCER_H 9#define LLVM_XRAY_FDRRECORDPRODUCER_H 10 11#include "llvm/Support/Error.h" 12#include "llvm/XRay/FDRRecords.h" 13#include "llvm/XRay/XRayRecord.h" 14#include <memory> 15 16namespace llvm { 17namespace xray { 18 19class RecordProducer { 20public: 21 /// All producer implementations must yield either an Error or a non-nullptr 22 /// unique_ptr<Record>. 23 virtual Expected<std::unique_ptr<Record>> produce() = 0; 24 virtual ~RecordProducer() = default; 25}; 26 27class FileBasedRecordProducer : public RecordProducer { 28 const XRayFileHeader &Header; 29 DataExtractor &E; 30 uint64_t &OffsetPtr; 31 uint32_t CurrentBufferBytes = 0; 32 33 // Helper function which gets the next record by speculatively reading through 34 // the log, finding a buffer extents record. 35 Expected<std::unique_ptr<Record>> findNextBufferExtent(); 36 37public: 38 FileBasedRecordProducer(const XRayFileHeader &FH, DataExtractor &DE, 39 uint64_t &OP) 40 : Header(FH), E(DE), OffsetPtr(OP) {} 41 42 /// This producer encapsulates the logic for loading a File-backed 43 /// RecordProducer hidden behind a DataExtractor. 44 Expected<std::unique_ptr<Record>> produce() override; 45}; 46 47} // namespace xray 48} // namespace llvm 49 50#endif // LLVM_XRAY_FDRRECORDPRODUCER_H 51