1 //===- FDRTraceWriter.cpp - XRay FDR Trace Writer ---------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // Test a utility that can write out XRay FDR Mode formatted trace files.
11 //===----------------------------------------------------------------------===//
25                        int> = 0>
26   static size_t write(support::endian::Writer &OS, Tuple &&T) {  in write()  function
27     OS.write(std::get<Index>(T));  in write()
28     return sizeof(std::get<Index>(T)) + IndexedWriter<Index + 1>::write(OS, T);  in write()
35                        int> = 0>
36   static size_t write(support::endian::Writer &OS, Tuple &&) {  in write()  function
37     return 0;  in write()
44   // we ensure this is the case when we write out the first byte of the record.  in writeMetadata()
45   uint8_t FirstByte = (static_cast<uint8_t>(Kind) << 1) | uint8_t{0x01u};  in writeMetadata()
47   // Write in field order.  in writeMetadata()
48   OS.write(FirstByte);  in writeMetadata()
49   auto Bytes = IndexedWriter<0>::write(OS, T);  in writeMetadata()
50   assert(Bytes <= 15 && "Must only ever write at most 16 byte metadata!");  in writeMetadata()
53     OS.write('\0');  in writeMetadata()
61   // We need to re-construct a header, by writing the fields we care about for  in FDRTraceWriter()
64       (H.ConstantTSC ? 0x01 : 0x0) | (H.NonstopTSC ? 0x02 : 0x0);  in FDRTraceWriter()
66   // For endian-correctness, we need to write these fields in the order they  in FDRTraceWriter()
68   OS.write(H.Version);  in FDRTraceWriter()
69   OS.write(H.Type);  in FDRTraceWriter()
70   OS.write(BitField);  in FDRTraceWriter()
71   OS.write(H.CycleFrequency);  in FDRTraceWriter()
74   OS.write(FreeFormBytes);  in FDRTraceWriter()
100   OS.write(Bytes);  in visit()
109   OS.write(Bytes);  in visit()
118   OS.write(Bytes);  in visit()
131   return writeMetadata<0u>(OS, R.tid());  in visit()
135   return writeMetadata<1u>(OS, 0);  in visit()
139   // Write out the data in "field" order, to be endian-aware.  in visit()
140   uint32_t TypeRecordFuncId = uint32_t{R.functionId() & ~uint32_t{0x0Fu << 28}};  in visit()
144   TypeRecordFuncId &= ~uint32_t{0x01};  in visit()
145   OS.write(TypeRecordFuncId);  in visit()
146   OS.write(R.delta());  in visit()