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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | ////===- SampleProfileLoadBaseUtil.h - Profile loader util func --*- C++-*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | /// \file |
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| 10 | /// This file provides the utility functions for the sampled PGO loader base |
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| 11 | /// implementation. |
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| 12 | // |
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| 13 | //===----------------------------------------------------------------------===// |
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| 14 | |||
| 15 | #ifndef LLVM_TRANSFORMS_UTILS_SAMPLEPROFILELOADERBASEUTIL_H |
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| 16 | #define LLVM_TRANSFORMS_UTILS_SAMPLEPROFILELOADERBASEUTIL_H |
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| 17 | |||
| 18 | #include "llvm/ADT/DenseMap.h" |
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| 19 | #include "llvm/ProfileData/SampleProf.h" |
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| 20 | #include "llvm/Support/CommandLine.h" |
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| 21 | |||
| 22 | namespace llvm { |
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| 23 | using namespace sampleprof; |
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| 24 | |||
| 25 | class ProfileSummaryInfo; |
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| 26 | class Module; |
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| 27 | |||
| 28 | extern cl::opt<unsigned> SampleProfileMaxPropagateIterations; |
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| 29 | extern cl::opt<unsigned> SampleProfileRecordCoverage; |
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| 30 | extern cl::opt<unsigned> SampleProfileSampleCoverage; |
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| 31 | extern cl::opt<bool> NoWarnSampleUnused; |
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| 32 | |||
| 33 | namespace sampleprofutil { |
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| 34 | |||
| 35 | class SampleCoverageTracker { |
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| 36 | public: |
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| 37 | bool markSamplesUsed(const FunctionSamples *FS, uint32_t LineOffset, |
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| 38 | uint32_t Discriminator, uint64_t Samples); |
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| 39 | unsigned computeCoverage(unsigned Used, unsigned Total) const; |
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| 40 | unsigned countUsedRecords(const FunctionSamples *FS, |
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| 41 | ProfileSummaryInfo *PSI) const; |
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| 42 | unsigned countBodyRecords(const FunctionSamples *FS, |
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| 43 | ProfileSummaryInfo *PSI) const; |
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| 44 | uint64_t getTotalUsedSamples() const { return TotalUsedSamples; } |
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| 45 | uint64_t countBodySamples(const FunctionSamples *FS, |
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| 46 | ProfileSummaryInfo *PSI) const; |
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| 47 | |||
| 48 | void clear() { |
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| 49 | SampleCoverage.clear(); |
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| 50 | TotalUsedSamples = 0; |
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| 51 | } |
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| 52 | void setProfAccForSymsInList(bool V) { ProfAccForSymsInList = V; } |
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| 53 | |||
| 54 | private: |
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| 55 | using BodySampleCoverageMap = std::map<LineLocation, unsigned>; |
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| 56 | using FunctionSamplesCoverageMap = |
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| 57 | DenseMap<const FunctionSamples *, BodySampleCoverageMap>; |
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| 58 | |||
| 59 | /// Coverage map for sampling records. |
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| 60 | /// |
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| 61 | /// This map keeps a record of sampling records that have been matched to |
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| 62 | /// an IR instruction. This is used to detect some form of staleness in |
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| 63 | /// profiles (see flag -sample-profile-check-coverage). |
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| 64 | /// |
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| 65 | /// Each entry in the map corresponds to a FunctionSamples instance. This is |
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| 66 | /// another map that counts how many times the sample record at the |
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| 67 | /// given location has been used. |
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| 68 | FunctionSamplesCoverageMap SampleCoverage; |
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| 69 | |||
| 70 | /// Number of samples used from the profile. |
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| 71 | /// |
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| 72 | /// When a sampling record is used for the first time, the samples from |
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| 73 | /// that record are added to this accumulator. Coverage is later computed |
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| 74 | /// based on the total number of samples available in this function and |
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| 75 | /// its callsites. |
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| 76 | /// |
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| 77 | /// Note that this accumulator tracks samples used from a single function |
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| 78 | /// and all the inlined callsites. Strictly, we should have a map of counters |
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| 79 | /// keyed by FunctionSamples pointers, but these stats are cleared after |
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| 80 | /// every function, so we just need to keep a single counter. |
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| 81 | uint64_t TotalUsedSamples = 0; |
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| 82 | |||
| 83 | // For symbol in profile symbol list, whether to regard their profiles |
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| 84 | // to be accurate. This is passed from the SampleLoader instance. |
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| 85 | bool ProfAccForSymsInList = false; |
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| 86 | }; |
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| 87 | |||
| 88 | /// Return true if the given callsite is hot wrt to hot cutoff threshold. |
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| 89 | bool callsiteIsHot(const FunctionSamples *CallsiteFS, ProfileSummaryInfo *PSI, |
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| 90 | bool ProfAccForSymsInList); |
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| 91 | |||
| 92 | /// Create a global variable to flag FSDiscriminators are used. |
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| 93 | void createFSDiscriminatorVariable(Module *M); |
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| 94 | |||
| 95 | } // end of namespace sampleprofutil |
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| 96 | } // end of namespace llvm |
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| 97 | |||
| 98 | #endif // LLVM_TRANSFORMS_UTILS_SAMPLEPROFILELOADERBASEUTIL_H |