llvm/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp

   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
  16 using namespace llvm;
  17
  18 void 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
  26 void GISelChangeObserver::finishedChangingAllUsesOfReg() {
  27   for (auto *ChangedMI : ChangingAllUsesOfReg)
  28     changedInstr(*ChangedMI);
  29   ChangingAllUsesOfReg.clear();
  30 }
  31
  32 RAIIDelegateInstaller::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
  40 RAIIDelegateInstaller::~RAIIDelegateInstaller() { MF.resetDelegate(Delegate); }
  41
  42 RAIIMFObserverInstaller::RAIIMFObserverInstaller(MachineFunction &MF,
  43                                                  GISelChangeObserver &Observer)
  44     : MF(MF) {
  45   MF.setObserver(&Observer);
  46 }
  47
  48 RAIIMFObserverInstaller::~RAIIMFObserverInstaller() { MF.setObserver(nullptr); }