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//===----- MIRFSDiscriminator.h: MIR FS Discriminator Support --0-- c++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file contains the supporting functions for adding Machine level IR
// Flow Sensitive discriminators to the instruction debug information. With
// this, a cloned machine instruction in a different MachineBasicBlock will
// have its own discriminator value. This is done in a MIRAddFSDiscriminators
// pass.
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/Discriminator.h"
#include <cassert>
#include <cstdint>
namespace llvm {
class MachineFunction;
using namespace sampleprof;
class MIRAddFSDiscriminators : public MachineFunctionPass {
MachineFunction *MF = nullptr;
FSDiscriminatorPass Pass;
unsigned LowBit;
unsigned HighBit;
static char ID;
/// PassNum is the sequence number this pass is called, start from 1.
MIRAddFSDiscriminators(FSDiscriminatorPass P = FSDiscriminatorPass::Pass1)
: MachineFunctionPass(ID), Pass(P) {
LowBit = getFSPassBitBegin(P);
HighBit = getFSPassBitEnd(P);
assert(LowBit < HighBit && "HighBit needs to be greater than Lowbit");
StringRef getPassName() const override {
return "Add FS discriminators in MIR";
/// getNumFSBBs() - Return the number of machine BBs that have FS samples.
unsigned getNumFSBBs();
/// getNumFSSamples() - Return the number of samples that have flow sensitive
/// values.
uint64_t getNumFSSamples();
/// getMachineFunction - Return the current machine function.
const MachineFunction *getMachineFunction() const { return MF; }
bool runOnMachineFunction(MachineFunction &) override;
} // namespace llvm