MemProfSummary.h

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//===- MemProfSummary.h - MemProf summary support ---------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains MemProf summary support.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_PROFILEDATA_MEMPROFSUMMARY_H
#define LLVM_PROFILEDATA_MEMPROFSUMMARY_H
 
#include "llvm/ProfileData/DataAccessProf.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/Compiler.h"
 
namespace llvm {
namespace memprof {
 
class MemProfSummary {
private:
  /// The number of summary fields below, which is used to enable some forwards
  /// and backwards compatibility for the summary when serialized in the indexed
  /// MemProf format. As long as no existing summary fields are removed or
  /// reordered, and new summary fields are added after existing summary fields,
  /// the MemProf indexed profile version does not need to be bumped to
  /// accommodate new summary fields.
  static constexpr unsigned NumSummaryFields = 6;
 
  const uint64_t NumContexts, NumColdContexts, NumHotContexts;
  const uint64_t MaxColdTotalSize, MaxWarmTotalSize, MaxHotTotalSize;
 
  // MemProf v3 and prior versions don't have data access profile,
  // so record the data access profile state.
  bool HasDataAccessProfile = false;
  size_t NumHotSymbolsAndStringLiterals = 0;
  size_t NumKnownColdSymbols = 0;
  size_t NumKnownColdStringLiterals = 0;
 
public:
  MemProfSummary(uint64_t NumContexts, uint64_t NumColdContexts,
                 uint64_t NumHotContexts, uint64_t MaxColdTotalSize,
                 uint64_t MaxWarmTotalSize, uint64_t MaxHotTotalSize)
      : NumContexts(NumContexts), NumColdContexts(NumColdContexts),
        NumHotContexts(NumHotContexts), MaxColdTotalSize(MaxColdTotalSize),
        MaxWarmTotalSize(MaxWarmTotalSize), MaxHotTotalSize(MaxHotTotalSize),
        HasDataAccessProfile(false) {}
 
  static constexpr unsigned getNumSummaryFields() { return NumSummaryFields; }
  uint64_t getNumContexts() const { return NumContexts; }
  uint64_t getNumColdContexts() const { return NumColdContexts; }
  uint64_t getNumHotContexts() const { return NumHotContexts; }
  uint64_t getMaxColdTotalSize() const { return MaxColdTotalSize; }
  uint64_t getMaxWarmTotalSize() const { return MaxWarmTotalSize; }
  uint64_t getMaxHotTotalSize() const { return MaxHotTotalSize; }
  LLVM_ABI void printSummaryYaml(raw_ostream &OS) const;
  /// Write to indexed MemProf profile.
  LLVM_ABI void write(ProfOStream &OS) const;
  /// Read from indexed MemProf profile.
  LLVM_ABI static std::unique_ptr<MemProfSummary>
  deserialize(const unsigned char *&);
  /// Build data access profile summary from \p DataAccessProfile.
  /// The pointer is not owned.
  /// TODO: Remove this function after the data access profile summary is
  /// serialized.
  LLVM_ABI void
  buildDataAccessSummary(const DataAccessProfData &DataAccessProfile);
};
 
} // namespace memprof
} // namespace llvm
 
#endif // LLVM_PROFILEDATA_MEMPROFSUMMARY_H