Move pointee_type.h/.cc to lifetime_annotations.
A followup CL will use this in lifetime_annotations.
PiperOrigin-RevId: 432419010
diff --git a/lifetime_annotations/pointee_type.cc b/lifetime_annotations/pointee_type.cc
new file mode 100644
index 0000000..4e8866b
--- /dev/null
+++ b/lifetime_annotations/pointee_type.cc
@@ -0,0 +1,35 @@
+// Part of the Crubit project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "lifetime_annotations/pointee_type.h"
+
+namespace devtools_rust {
+
+// If `type` is a reference-like type, returns the type of its pointee.
+// Otherwise, returns a null type.
+clang::QualType PointeeType(clang::QualType type) {
+ if (type.isNull()) {
+ return clang::QualType();
+ }
+
+ // For the purposes of inference, we always use canonical types. Later, if we
+ // need to produce a lifetime annotation for a type that is actually a typedef
+ // for another type, we'll handle that there.
+ type = type.getCanonicalType();
+
+ if (auto ptr_type = type->getAs<clang::PointerType>()) {
+ return ptr_type->getPointeeType();
+ } else if (auto ref_type = type->getAs<clang::ReferenceType>()) {
+ return ref_type->getPointeeType();
+ }
+
+ // TODO(mboehme): Handle these additional cases:
+ // - For array types, recurse into the element type
+ // - Types with type parameters
+ // - Type arguments for class templates
+
+ return clang::QualType();
+}
+
+} // namespace devtools_rust
