1 files changed, 39 insertions, 0 deletions
diff --git a/llvm/lib/Target/RegisterTargetPassConfigCallback.cpp b/llvm/lib/Target/RegisterTargetPassConfigCallback.cpp
new file mode 100644
index 000000000000..a80b8b825b18
--- /dev/null
+++ b/llvm/lib/Target/RegisterTargetPassConfigCallback.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 contains the registry for PassConfigCallbacks that enable changes
+/// to the TargetPassConfig during the initialization of TargetMachine.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/RegisterTargetPassConfigCallback.h"
+
+namespace llvm {
+// TargetPassConfig callbacks
+static SmallVector<RegisterTargetPassConfigCallback *, 1>
+    TargetPassConfigCallbacks{};
+
+void invokeGlobalTargetPassConfigCallbacks(TargetMachine &TM,
+                                           PassManagerBase &PM,
+                                           TargetPassConfig *PassConfig) {
+  for (const RegisterTargetPassConfigCallback *Reg : TargetPassConfigCallbacks)
+    Reg->Callback(TM, PM, PassConfig);
+}
+
+RegisterTargetPassConfigCallback::RegisterTargetPassConfigCallback(
+    PassConfigCallback &&C)
+    : Callback(std::move(C)) {
+  TargetPassConfigCallbacks.push_back(this);
+}
+
+RegisterTargetPassConfigCallback::~RegisterTargetPassConfigCallback() {
+  const auto &It = find(TargetPassConfigCallbacks, this);
+  if (It != TargetPassConfigCallbacks.end())
+    TargetPassConfigCallbacks.erase(It);
+}
+} // namespace llvm