================
@@ -0,0 +1,183 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Target/BorrowedStackFrame.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+char BorrowedStackFrame::ID;
+
+BorrowedStackFrame::BorrowedStackFrame(
+    StackFrameSP borrowed_frame_sp, uint32_t new_frame_index,
+    std::optional<uint32_t> new_concrete_frame_index)
+    : StackFrame(
+          borrowed_frame_sp->GetThread(), new_frame_index,
+          borrowed_frame_sp->GetConcreteFrameIndex(),
+          borrowed_frame_sp->GetRegisterContextSP(),
+          borrowed_frame_sp->GetStackID().GetPC(),
+          borrowed_frame_sp->GetStackID().GetCallFrameAddressWithoutMetadata(),
+          borrowed_frame_sp->m_behaves_like_zeroth_frame,
+          &borrowed_frame_sp->GetSymbolContext(eSymbolContextEverything)),
+      m_borrowed_frame_sp(borrowed_frame_sp),
+      m_new_frame_index(new_frame_index),
+      m_new_concrete_frame_index(new_concrete_frame_index
+                                     ? *new_concrete_frame_index
+                                     : new_frame_index) {}
+
+uint32_t BorrowedStackFrame::GetFrameIndex() const { return m_new_frame_index; 
}
+
+void BorrowedStackFrame::SetFrameIndex(uint32_t index) {
+  m_new_frame_index = index;
+}
+
+uint32_t BorrowedStackFrame::GetConcreteFrameIndex() {
+  // Inline frames don't have their own concrete frame index.
----------------
jimingham wrote:

Otherwise, you are ignoring the m_new_concrete_frame_index the user actually 
passed to the constructor of this frame if it happens to be inlined, which 
doesn't seem right.

https://github.com/llvm/llvm-project/pull/170191
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