1//===-- lib/CodeGen/GlobalISel/GISelChangeObserver.cpp --------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file constains common code to combine machine functions at generic
10// level.
11//===----------------------------------------------------------------------===//
12
13#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
14#include "llvm/CodeGen/MachineRegisterInfo.h"
15
16using namespace llvm;
17
18void GISelChangeObserver::changingAllUsesOfReg(
19    const MachineRegisterInfo &MRI, Register Reg) {
20  for (auto &ChangingMI : MRI.use_instructions(Reg)) {
21    changingInstr(ChangingMI);
22    ChangingAllUsesOfReg.insert(&ChangingMI);
23  }
24}
25
26void GISelChangeObserver::finishedChangingAllUsesOfReg() {
27  for (auto *ChangedMI : ChangingAllUsesOfReg)
28    changedInstr(*ChangedMI);
29  ChangingAllUsesOfReg.clear();
30}
31
32RAIIDelegateInstaller::RAIIDelegateInstaller(MachineFunction &MF,
33                                             MachineFunction::Delegate *Del)
34    : MF(MF), Delegate(Del) {
35  // Register this as the delegate for handling insertions and deletions of
36  // instructions.
37  MF.setDelegate(Del);
38}
39
40RAIIDelegateInstaller::~RAIIDelegateInstaller() { MF.resetDelegate(Delegate); }
41
42RAIIMFObserverInstaller::RAIIMFObserverInstaller(MachineFunction &MF,
43                                                 GISelChangeObserver &Observer)
44    : MF(MF) {
45  MF.setObserver(&Observer);
46}
47
48RAIIMFObserverInstaller::~RAIIMFObserverInstaller() { MF.setObserver(nullptr); }
49