diff --git a/llvm/include/llvm/Passes/PassBuilder.h b/llvm/include/llvm/Passes/PassBuilder.h
--- a/llvm/include/llvm/Passes/PassBuilder.h
+++ b/llvm/include/llvm/Passes/PassBuilder.h
@@ -631,6 +631,13 @@
                               std::string ProfileFile,
                               std::string ProfileRemappingFile);
 
+
+  /// Returns PIC. External libraries can use this to register pass
+  /// instrumentation callbacks.
+  PassInstrumentationCallbacks *getPassInstrumentationCallbacks() const {
+    return PIC;
+  }
+
 private:
   static Optional<std::vector<PipelineElement>>
   parsePipelineText(StringRef Text);
diff --git a/llvm/unittests/IR/PassBuilderCallbacksTest.cpp b/llvm/unittests/IR/PassBuilderCallbacksTest.cpp
--- a/llvm/unittests/IR/PassBuilderCallbacksTest.cpp
+++ b/llvm/unittests/IR/PassBuilderCallbacksTest.cpp
@@ -418,6 +418,9 @@
         PB(nullptr, PipelineTuningOptions(), None, &CallbacksHandle.Callbacks),
         PM(true), LAM(true), FAM(true), CGAM(true), AM(true) {
 
+    EXPECT_TRUE(&CallbacksHandle.Callbacks ==
+                PB.getPassInstrumentationCallbacks());
+
     /// Register a callback for analysis registration.
     ///
     /// The callback is a function taking a reference to an AnalyisManager