/usr/include/llvm-6.0/llvm/CodeGen/LazyMachineBlockFrequencyInfo.h is in llvm-6.0-dev 1:6.0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | ///===- LazyMachineBlockFrequencyInfo.h - Lazy Block Frequency -*- C++ -*--===//
///
/// The LLVM Compiler Infrastructure
///
/// This file is distributed under the University of Illinois Open Source
/// License. See LICENSE.TXT for details.
///
///===---------------------------------------------------------------------===//
/// \file
/// This is an alternative analysis pass to MachineBlockFrequencyInfo. The
/// difference is that with this pass the block frequencies are not computed
/// when the analysis pass is executed but rather when the BFI result is
/// explicitly requested by the analysis client.
///
///===---------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_LAZYMACHINEBLOCKFREQUENCYINFO_H
#define LLVM_ANALYSIS_LAZYMACHINEBLOCKFREQUENCYINFO_H
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
namespace llvm {
/// \brief This is an alternative analysis pass to MachineBlockFrequencyInfo.
/// The difference is that with this pass, the block frequencies are not
/// computed when the analysis pass is executed but rather when the BFI result
/// is explicitly requested by the analysis client.
///
/// This works by checking querying if MBFI is available and otherwise
/// generating MBFI on the fly. In this case the passes required for (LI, DT)
/// are also queried before being computed on the fly.
///
/// Note that it is expected that we wouldn't need this functionality for the
/// new PM since with the new PM, analyses are executed on demand.
class LazyMachineBlockFrequencyInfoPass : public MachineFunctionPass {
private:
/// If generated on the fly this own the instance.
mutable std::unique_ptr<MachineBlockFrequencyInfo> OwnedMBFI;
/// If generated on the fly this own the instance.
mutable std::unique_ptr<MachineLoopInfo> OwnedMLI;
/// If generated on the fly this own the instance.
mutable std::unique_ptr<MachineDominatorTree> OwnedMDT;
/// The function.
MachineFunction *MF = nullptr;
/// \brief Calculate MBFI and all other analyses that's not available and
/// required by BFI.
MachineBlockFrequencyInfo &calculateIfNotAvailable() const;
public:
static char ID;
LazyMachineBlockFrequencyInfoPass();
/// \brief Compute and return the block frequencies.
MachineBlockFrequencyInfo &getBFI() { return calculateIfNotAvailable(); }
/// \brief Compute and return the block frequencies.
const MachineBlockFrequencyInfo &getBFI() const {
return calculateIfNotAvailable();
}
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnMachineFunction(MachineFunction &F) override;
void releaseMemory() override;
void print(raw_ostream &OS, const Module *M) const override;
};
}
#endif
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