1 files changed, 40 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp b/llvm/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp
new file mode 100644
index 000000000000..62b903c30b89
--- /dev/null
+++ b/llvm/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp
@@ -0,0 +1,40 @@
+//===-- lib/CodeGen/GlobalISel/GISelChangeObserver.cpp --------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file constains common code to combine machine functions at generic
+// level.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+
+using namespace llvm;
+
+void GISelChangeObserver::changingAllUsesOfReg(
+    const MachineRegisterInfo &MRI, unsigned Reg) {
+  for (auto &ChangingMI : MRI.use_instructions(Reg)) {
+    changingInstr(ChangingMI);
+    ChangingAllUsesOfReg.insert(&ChangingMI);
+  }
+}
+
+void GISelChangeObserver::finishedChangingAllUsesOfReg() {
+  for (auto *ChangedMI : ChangingAllUsesOfReg)
+    changedInstr(*ChangedMI);
+  ChangingAllUsesOfReg.clear();
+}
+
+RAIIDelegateInstaller::RAIIDelegateInstaller(MachineFunction &MF,
+                                             MachineFunction::Delegate *Del)
+    : MF(MF), Delegate(Del) {
+  // Register this as the delegate for handling insertions and deletions of
+  // instructions.
+  MF.setDelegate(Del);
+}
+
+RAIIDelegateInstaller::~RAIIDelegateInstaller() { MF.resetDelegate(Delegate); }