1 //===- InstrProfWriter.h - Instrumented profiling writer --------*- C++ -*-===//
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 //
9 // This file contains support for writing profiling data for instrumentation
10 // based PGO and coverage.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_PROFILEDATA_INSTRPROFWRITER_H
15 #define LLVM_PROFILEDATA_INSTRPROFWRITER_H
16 
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/StringMap.h"
19 #include "llvm/ProfileData/InstrProf.h"
20 #include "llvm/Support/Endian.h"
21 #include "llvm/Support/Error.h"
22 #include "llvm/Support/MemoryBuffer.h"
23 #include <cstdint>
24 #include <memory>
25 
26 namespace llvm {
27 
28 /// Writer for instrumentation based profile data.
29 class InstrProfRecordWriterTrait;
30 class ProfOStream;
31 class raw_fd_ostream;
32 
33 class InstrProfWriter {
34 public:
35   using ProfilingData = SmallDenseMap<uint64_t, InstrProfRecord>;
36   // PF_IRLevelWithCS is the profile from context sensitive IR instrumentation.
37   enum ProfKind { PF_Unknown = 0, PF_FE, PF_IRLevel, PF_IRLevelWithCS };
38 
39 private:
40   bool Sparse;
41   StringMap<ProfilingData> FunctionData;
42   ProfKind ProfileKind = PF_Unknown;
43   // Use raw pointer here for the incomplete type object.
44   InstrProfRecordWriterTrait *InfoObj;
45 
46 public:
47   InstrProfWriter(bool Sparse = false);
48   ~InstrProfWriter();
49 
50   /// Add function counts for the given function. If there are already counts
51   /// for this function and the hash and number of counts match, each counter is
52   /// summed. Optionally scale counts by \p Weight.
53   void addRecord(NamedInstrProfRecord &&I, uint64_t Weight,
54                  function_ref<void(Error)> Warn);
55   void addRecord(NamedInstrProfRecord &&I, function_ref<void(Error)> Warn) {
56     addRecord(std::move(I), 1, Warn);
57   }
58 
59   /// Merge existing function counts from the given writer.
60   void mergeRecordsFromWriter(InstrProfWriter &&IPW,
61                               function_ref<void(Error)> Warn);
62 
63   /// Write the profile to \c OS
64   void write(raw_fd_ostream &OS);
65 
66   /// Write the profile in text format to \c OS
67   Error writeText(raw_fd_ostream &OS);
68 
69   /// Write \c Record in text format to \c OS
70   static void writeRecordInText(StringRef Name, uint64_t Hash,
71                                 const InstrProfRecord &Counters,
72                                 InstrProfSymtab &Symtab, raw_fd_ostream &OS);
73 
74   /// Write the profile, returning the raw data. For testing.
75   std::unique_ptr<MemoryBuffer> writeBuffer();
76 
77   /// Set the ProfileKind. Report error if mixing FE and IR level profiles.
78   /// \c WithCS indicates if this is for contenxt sensitive instrumentation.
79   Error setIsIRLevelProfile(bool IsIRLevel, bool WithCS) {
80     if (ProfileKind == PF_Unknown) {
81       if (IsIRLevel)
82         ProfileKind = WithCS ? PF_IRLevelWithCS : PF_IRLevel;
83       else
84         ProfileKind = PF_FE;
85       return Error::success();
86     }
87 
88     if (((ProfileKind != PF_FE) && !IsIRLevel) ||
89         ((ProfileKind == PF_FE) && IsIRLevel))
90       return make_error<InstrProfError>(instrprof_error::unsupported_version);
91 
92     // When merging a context-sensitive profile (WithCS == true) with an IRLevel
93     // profile, set the kind to PF_IRLevelWithCS.
94     if (ProfileKind == PF_IRLevel && WithCS)
95       ProfileKind = PF_IRLevelWithCS;
96 
97     return Error::success();
98   }
99 
100   // Internal interface for testing purpose only.
101   void setValueProfDataEndianness(support::endianness Endianness);
102   void setOutputSparse(bool Sparse);
103   // Compute the overlap b/w this object and Other. Program level result is
104   // stored in Overlap and function level result is stored in FuncLevelOverlap.
105   void overlapRecord(NamedInstrProfRecord &&Other, OverlapStats &Overlap,
106                      OverlapStats &FuncLevelOverlap,
107                      const OverlapFuncFilters &FuncFilter);
108 
109 private:
110   void addRecord(StringRef Name, uint64_t Hash, InstrProfRecord &&I,
111                  uint64_t Weight, function_ref<void(Error)> Warn);
112   bool shouldEncodeData(const ProfilingData &PD);
113   void writeImpl(ProfOStream &OS);
114 };
115 
116 } // end namespace llvm
117 
118 #endif // LLVM_PROFILEDATA_INSTRPROFWRITER_H
119