1////===- SampleProfileLoadBaseUtil.h - Profile loader util func --*- 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/// \file
10/// This file provides the utility functions for the sampled PGO loader base
11/// implementation.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_TRANSFORMS_UTILS_SAMPLEPROFILELOADERBASEUTIL_H
16#define LLVM_TRANSFORMS_UTILS_SAMPLEPROFILELOADERBASEUTIL_H
17
18#include "llvm/ADT/DenseMap.h"
19#include "llvm/ProfileData/SampleProf.h"
20#include "llvm/Support/CommandLine.h"
21
22namespace llvm {
23using namespace sampleprof;
24
25class ProfileSummaryInfo;
26class Module;
27
28extern cl::opt<unsigned> SampleProfileMaxPropagateIterations;
29extern cl::opt<unsigned> SampleProfileRecordCoverage;
30extern cl::opt<unsigned> SampleProfileSampleCoverage;
31extern cl::opt<bool> NoWarnSampleUnused;
32
33namespace sampleprofutil {
34
35class SampleCoverageTracker {
36public:
37 bool markSamplesUsed(const FunctionSamples *FS, uint32_t LineOffset,
38 uint32_t Discriminator, uint64_t Samples);
39 unsigned computeCoverage(unsigned Used, unsigned Total) const;
40 unsigned countUsedRecords(const FunctionSamples *FS,
41 ProfileSummaryInfo *PSI) const;
42 unsigned countBodyRecords(const FunctionSamples *FS,
43 ProfileSummaryInfo *PSI) const;
44 uint64_t getTotalUsedSamples() const { return TotalUsedSamples; }
45 uint64_t countBodySamples(const FunctionSamples *FS,
46 ProfileSummaryInfo *PSI) const;
47
48 void clear() {
49 SampleCoverage.clear();
50 TotalUsedSamples = 0;
51 }
52 void setProfAccForSymsInList(bool V) { ProfAccForSymsInList = V; }
53
54private:
55 using BodySampleCoverageMap = std::map<LineLocation, unsigned>;
56 using FunctionSamplesCoverageMap =
57 DenseMap<const FunctionSamples *, BodySampleCoverageMap>;
58
59 /// Coverage map for sampling records.
60 ///
61 /// This map keeps a record of sampling records that have been matched to
62 /// an IR instruction. This is used to detect some form of staleness in
63 /// profiles (see flag -sample-profile-check-coverage).
64 ///
65 /// Each entry in the map corresponds to a FunctionSamples instance. This is
66 /// another map that counts how many times the sample record at the
67 /// given location has been used.
68 FunctionSamplesCoverageMap SampleCoverage;
69
70 /// Number of samples used from the profile.
71 ///
72 /// When a sampling record is used for the first time, the samples from
73 /// that record are added to this accumulator. Coverage is later computed
74 /// based on the total number of samples available in this function and
75 /// its callsites.
76 ///
77 /// Note that this accumulator tracks samples used from a single function
78 /// and all the inlined callsites. Strictly, we should have a map of counters
79 /// keyed by FunctionSamples pointers, but these stats are cleared after
80 /// every function, so we just need to keep a single counter.
81 uint64_t TotalUsedSamples = 0;
82
83 // For symbol in profile symbol list, whether to regard their profiles
84 // to be accurate. This is passed from the SampleLoader instance.
85 bool ProfAccForSymsInList = false;
86};
87
88/// Return true if the given callsite is hot wrt to hot cutoff threshold.
89bool callsiteIsHot(const FunctionSamples *CallsiteFS, ProfileSummaryInfo *PSI,
90 bool ProfAccForSymsInList);
91
92/// Create a global variable to flag FSDiscriminators are used.
93void createFSDiscriminatorVariable(Module *M);
94
95} // end of namespace sampleprofutil
96} // end of namespace llvm
97
98#endif // LLVM_TRANSFORMS_UTILS_SAMPLEPROFILELOADERBASEUTIL_H
99

source code of llvm/include/llvm/Transforms/Utils/SampleProfileLoaderBaseUtil.h