BasicBlockSectionUtils.h

Go to the documentation of this file.

//===- BasicBlockSectionUtils.h - Utilities for basic block sections     --===//
//
// 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
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CODEGEN_BASICBLOCKSECTIONUTILS_H
#define LLVM_CODEGEN_BASICBLOCKSECTIONUTILS_H
 
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/CommandLine.h"
 
namespace llvm {
 
extern cl::opt<std::string> BBSectionsColdTextPrefix;
 
class MachineFunction;
class MachineBasicBlock;
 
using MachineBasicBlockComparator =
    function_ref<bool(const MachineBasicBlock &, const MachineBasicBlock &)>;
 
void sortBasicBlocksAndUpdateBranches(MachineFunction &MF,
                                      MachineBasicBlockComparator MBBCmp);
 
void avoidZeroOffsetLandingPad(MachineFunction &MF);
 
/// This checks if the source of this function has drifted since this binary was
/// profiled previously.
/// For now, we are piggy backing on what PGO does to
/// detect this with instrumented profiles.  PGO emits an hash of the IR and
/// checks if the hash has changed.  Advanced basic block layout is usually done
/// on top of PGO optimized binaries and hence this check works well in
/// practice.
bool hasInstrProfHashMismatch(MachineFunction &MF);
 
} // end namespace llvm
 
#endif // LLVM_CODEGEN_BASICBLOCKSECTIONUTILS_H