From 8be4d04455f70892a94d1e0798e266c948b4750a Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Fri, 14 Aug 2026 04:33:41 +0800
Subject: [CodeGen] Match LLVM Legalizer ownership

---
 .../lib/CodeGen/GlobalISel/GISelChangeObserver.cpp | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 backend/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp

(limited to 'backend/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp')

diff --git a/backend/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp b/backend/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp
new file mode 100644
index 0000000..4ce1473
--- /dev/null
+++ b/backend/lib/CodeGen/GlobalISel/GISelChangeObserver.cpp
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rcc/CodeGen/GlobalISel/GISelChangeObserver.h"
+
+#include <algorithm>
+
+namespace rcc {
+
+void GISelObserverWrapper::addObserver(GISelChangeObserver &Observer) {
+  Observers.push_back(&Observer);
+}
+
+void GISelObserverWrapper::removeObserver(GISelChangeObserver &Observer) {
+  const auto Position = std::ranges::find(Observers, &Observer);
+  if (Position != Observers.end())
+    Observers.erase(Position);
+}
+
+void GISelObserverWrapper::clearObservers() noexcept {
+  Observers.clear();
+}
+
+void GISelObserverWrapper::erasingInstr(MachineInstr &Instruction) {
+  for (GISelChangeObserver *Observer : Observers)
+    Observer->erasingInstr(Instruction);
+}
+
+void GISelObserverWrapper::createdInstr(MachineInstr &Instruction) {
+  for (GISelChangeObserver *Observer : Observers)
+    Observer->createdInstr(Instruction);
+}
+
+void GISelObserverWrapper::changingInstr(MachineInstr &Instruction) {
+  for (GISelChangeObserver *Observer : Observers)
+    Observer->changingInstr(Instruction);
+}
+
+void GISelObserverWrapper::changedInstr(MachineInstr &Instruction) {
+  for (GISelChangeObserver *Observer : Observers)
+    Observer->changedInstr(Instruction);
+}
+
+void GISelObserverWrapper::handleInsertion(MachineInstr &Instruction) {
+  createdInstr(Instruction);
+}
+
+void GISelObserverWrapper::handleRemoval(MachineInstr &Instruction) {
+  erasingInstr(Instruction);
+}
+
+MachineFunctionDelegateInstaller::MachineFunctionDelegateInstaller(
+    MachineFunction &Function, MachineFunction::Delegate &Delegate)
+    : Function(&Function), Delegate(&Delegate) {
+  Function.setDelegate(Delegate);
+}
+
+MachineFunctionDelegateInstaller::~MachineFunctionDelegateInstaller() {
+  Function->resetDelegate(*Delegate);
+}
+
+} // namespace rcc
-- 
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