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   bool InstrEntryBBEnabled;
44   // Use raw pointer here for the incomplete type object.
45   InstrProfRecordWriterTrait *InfoObj;
46 
47 public:
48   InstrProfWriter(bool Sparse = false, bool InstrEntryBBEnabled = false);
49   ~InstrProfWriter();
50 
51   StringMap<ProfilingData> &getProfileData() { return FunctionData; }
52 
53   /// Add function counts for the given function. If there are already counts
54   /// for this function and the hash and number of counts match, each counter is
55   /// summed. Optionally scale counts by \p Weight.
56   void addRecord(NamedInstrProfRecord &&I, uint64_t Weight,
57                  function_ref<void(Error)> Warn);
58   void addRecord(NamedInstrProfRecord &&I, function_ref<void(Error)> Warn) {
59     addRecord(std::move(I), 1, Warn);
60   }
61 
62   /// Merge existing function counts from the given writer.
63   void mergeRecordsFromWriter(InstrProfWriter &&IPW,
64                               function_ref<void(Error)> Warn);
65 
66   /// Write the profile to \c OS
67   void write(raw_fd_ostream &OS);
68 
69   /// Write the profile in text format to \c OS
70   Error writeText(raw_fd_ostream &OS);
71 
72   /// Write \c Record in text format to \c OS
73   static void writeRecordInText(StringRef Name, uint64_t Hash,
74                                 const InstrProfRecord &Counters,
75                                 InstrProfSymtab &Symtab, raw_fd_ostream &OS);
76 
77   /// Write the profile, returning the raw data. For testing.
78   std::unique_ptr<MemoryBuffer> writeBuffer();
79 
80   /// Set the ProfileKind. Report error if mixing FE and IR level profiles.
81   /// \c WithCS indicates if this is for contenxt sensitive instrumentation.
82   Error setIsIRLevelProfile(bool IsIRLevel, bool WithCS) {
83     if (ProfileKind == PF_Unknown) {
84       if (IsIRLevel)
85         ProfileKind = WithCS ? PF_IRLevelWithCS : PF_IRLevel;
86       else
87         ProfileKind = PF_FE;
88       return Error::success();
89     }
90 
91     if (((ProfileKind != PF_FE) && !IsIRLevel) ||
92         ((ProfileKind == PF_FE) && IsIRLevel))
93       return make_error<InstrProfError>(instrprof_error::unsupported_version);
94 
95     // When merging a context-sensitive profile (WithCS == true) with an IRLevel
96     // profile, set the kind to PF_IRLevelWithCS.
97     if (ProfileKind == PF_IRLevel && WithCS)
98       ProfileKind = PF_IRLevelWithCS;
99 
100     return Error::success();
101   }
102 
103   void setInstrEntryBBEnabled(bool Enabled) { InstrEntryBBEnabled = Enabled; }
104   // Internal interface for testing purpose only.
105   void setValueProfDataEndianness(support::endianness Endianness);
106   void setOutputSparse(bool Sparse);
107   // Compute the overlap b/w this object and Other. Program level result is
108   // stored in Overlap and function level result is stored in FuncLevelOverlap.
109   void overlapRecord(NamedInstrProfRecord &&Other, OverlapStats &Overlap,
110                      OverlapStats &FuncLevelOverlap,
111                      const OverlapFuncFilters &FuncFilter);
112 
113 private:
114   void addRecord(StringRef Name, uint64_t Hash, InstrProfRecord &&I,
115                  uint64_t Weight, function_ref<void(Error)> Warn);
116   bool shouldEncodeData(const ProfilingData &PD);
117   void writeImpl(ProfOStream &OS);
118 };
119 
120 } // end namespace llvm
121 
122 #endif // LLVM_PROFILEDATA_INSTRPROFWRITER_H
123