Coverage Report

Created: 2019-03-24 22:13

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/include/llvm/Analysis/BlockFrequencyInfo.h
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//===- BlockFrequencyInfo.h - Block Frequency Analysis ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Loops should be simplified before this analysis.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
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#define LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H
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#include "llvm/ADT/Optional.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/BlockFrequency.h"
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#include <cstdint>
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#include <memory>
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namespace llvm {
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class BasicBlock;
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class BranchProbabilityInfo;
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class Function;
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class LoopInfo;
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class Module;
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class raw_ostream;
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template <class BlockT> class BlockFrequencyInfoImpl;
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enum PGOViewCountsType { PGOVCT_None, PGOVCT_Graph, PGOVCT_Text };
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/// BlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation to
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/// estimate IR basic block frequencies.
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class BlockFrequencyInfo {
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  using ImplType = BlockFrequencyInfoImpl<BasicBlock>;
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  std::unique_ptr<ImplType> BFI;
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public:
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  BlockFrequencyInfo();
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  BlockFrequencyInfo(const Function &F, const BranchProbabilityInfo &BPI,
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                     const LoopInfo &LI);
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  BlockFrequencyInfo(const BlockFrequencyInfo &) = delete;
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  BlockFrequencyInfo &operator=(const BlockFrequencyInfo &) = delete;
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  BlockFrequencyInfo(BlockFrequencyInfo &&Arg);
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  BlockFrequencyInfo &operator=(BlockFrequencyInfo &&RHS);
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  ~BlockFrequencyInfo();
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  /// Handle invalidation explicitly.
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  bool invalidate(Function &F, const PreservedAnalyses &PA,
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                  FunctionAnalysisManager::Invalidator &);
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  const Function *getFunction() const;
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  const BranchProbabilityInfo *getBPI() const;
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  void view(StringRef = "BlockFrequencyDAGs") const;
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  /// getblockFreq - Return block frequency. Return 0 if we don't have the
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  /// information. Please note that initial frequency is equal to ENTRY_FREQ. It
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  /// means that we should not rely on the value itself, but only on the
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  /// comparison to the other block frequencies. We do this to avoid using of
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  /// floating points.
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  BlockFrequency getBlockFreq(const BasicBlock *BB) const;
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  /// Returns the estimated profile count of \p BB.
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  /// This computes the relative block frequency of \p BB and multiplies it by
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  /// the enclosing function's count (if available) and returns the value.
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  Optional<uint64_t> getBlockProfileCount(const BasicBlock *BB) const;
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  /// Returns the estimated profile count of \p Freq.
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  /// This uses the frequency \p Freq and multiplies it by
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  /// the enclosing function's count (if available) and returns the value.
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  Optional<uint64_t> getProfileCountFromFreq(uint64_t Freq) const;
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  /// Returns true if \p BB is an irreducible loop header
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  /// block. Otherwise false.
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  bool isIrrLoopHeader(const BasicBlock *BB);
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  // Set the frequency of the given basic block.
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  void setBlockFreq(const BasicBlock *BB, uint64_t Freq);
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  /// Set the frequency of \p ReferenceBB to \p Freq and scale the frequencies
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  /// of the blocks in \p BlocksToScale such that their frequencies relative
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  /// to \p ReferenceBB remain unchanged.
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  void setBlockFreqAndScale(const BasicBlock *ReferenceBB, uint64_t Freq,
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                            SmallPtrSetImpl<BasicBlock *> &BlocksToScale);
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  /// calculate - compute block frequency info for the given function.
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  void calculate(const Function &F, const BranchProbabilityInfo &BPI,
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                 const LoopInfo &LI);
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  // Print the block frequency Freq to OS using the current functions entry
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  // frequency to convert freq into a relative decimal form.
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  raw_ostream &printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const;
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  // Convenience method that attempts to look up the frequency associated with
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  // BB and print it to OS.
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  raw_ostream &printBlockFreq(raw_ostream &OS, const BasicBlock *BB) const;
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  uint64_t getEntryFreq() const;
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  void releaseMemory();
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  void print(raw_ostream &OS) const;
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};
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/// Analysis pass which computes \c BlockFrequencyInfo.
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class BlockFrequencyAnalysis
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    : public AnalysisInfoMixin<BlockFrequencyAnalysis> {
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  friend AnalysisInfoMixin<BlockFrequencyAnalysis>;
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  static AnalysisKey Key;
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public:
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  /// Provide the result type for this analysis pass.
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  using Result = BlockFrequencyInfo;
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  /// Run the analysis pass over a function and produce BFI.
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  Result run(Function &F, FunctionAnalysisManager &AM);
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};
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/// Printer pass for the \c BlockFrequencyInfo results.
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class BlockFrequencyPrinterPass
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    : public PassInfoMixin<BlockFrequencyPrinterPass> {
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  raw_ostream &OS;
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public:
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  explicit BlockFrequencyPrinterPass(raw_ostream &OS) : OS(OS) {}
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  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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};
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/// Legacy analysis pass which computes \c BlockFrequencyInfo.
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class BlockFrequencyInfoWrapperPass : public FunctionPass {
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  BlockFrequencyInfo BFI;
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public:
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  static char ID;
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  BlockFrequencyInfoWrapperPass();
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  ~BlockFrequencyInfoWrapperPass() override;
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1.42M
  BlockFrequencyInfo &getBFI() { return BFI; }
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  const BlockFrequencyInfo &getBFI() const { return BFI; }
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  void getAnalysisUsage(AnalysisUsage &AU) const override;
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  bool runOnFunction(Function &F) override;
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  void releaseMemory() override;
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  void print(raw_ostream &OS, const Module *M) const override;
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};
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} // end namespace llvm
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#endif // LLVM_ANALYSIS_BLOCKFREQUENCYINFO_H