0bf5846553
The main difference is that it's possible for multiple change observers to be installed at the same time whereas there can only be one MachineFunction delegate installed. This allows downstream targets to continue to use observers to recursively select. The target in question was selecting a gMIR instruction to a machine instruction plus some gMIR around it and relying on observers to ensure it correctly selected any gMIR it created before returning to the main loop.
59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
//===-- lib/CodeGen/GlobalISel/GISelChangeObserver.cpp --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file constains common code to combine machine functions at generic
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// level.
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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using namespace llvm;
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void GISelChangeObserver::changingAllUsesOfReg(
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const MachineRegisterInfo &MRI, Register Reg) {
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for (auto &ChangingMI : MRI.use_instructions(Reg)) {
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changingInstr(ChangingMI);
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ChangingAllUsesOfReg.insert(&ChangingMI);
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}
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}
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void GISelChangeObserver::finishedChangingAllUsesOfReg() {
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for (auto *ChangedMI : ChangingAllUsesOfReg)
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changedInstr(*ChangedMI);
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ChangingAllUsesOfReg.clear();
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}
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RAIIDelegateInstaller::RAIIDelegateInstaller(MachineFunction &MF,
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MachineFunction::Delegate *Del)
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: MF(MF), Delegate(Del) {
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// Register this as the delegate for handling insertions and deletions of
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// instructions.
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MF.setDelegate(Del);
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}
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RAIIDelegateInstaller::~RAIIDelegateInstaller() { MF.resetDelegate(Delegate); }
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RAIIMFObserverInstaller::RAIIMFObserverInstaller(MachineFunction &MF,
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GISelChangeObserver &Observer)
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: MF(MF) {
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MF.setObserver(&Observer);
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}
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RAIIMFObserverInstaller::~RAIIMFObserverInstaller() { MF.setObserver(nullptr); }
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RAIITemporaryObserverInstaller::RAIITemporaryObserverInstaller(
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GISelObserverWrapper &Observers, GISelChangeObserver &TemporaryObserver)
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: Observers(Observers), TemporaryObserver(TemporaryObserver) {
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Observers.addObserver(&TemporaryObserver);
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}
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RAIITemporaryObserverInstaller::~RAIITemporaryObserverInstaller() {
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Observers.removeObserver(&TemporaryObserver);
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}
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