1 files changed, 46 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Process/Utility/HistoryUnwind.h b/contrib/llvm-project/lldb/source/Plugins/Process/Utility/HistoryUnwind.h
new file mode 100644
index 000000000000..cb72b5d0a176
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Plugins/Process/Utility/HistoryUnwind.h
@@ -0,0 +1,46 @@
+//===-- HistoryUnwind.h -----------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_HISTORYUNWIND_H
+#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_HISTORYUNWIND_H
+
+#include <vector>
+
+#include "lldb/Target/Unwind.h"
+#include "lldb/lldb-private.h"
+
+namespace lldb_private {
+
+class HistoryUnwind : public lldb_private::Unwind {
+public:
+  HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
+                bool pcs_are_call_addresses = false);
+
+  ~HistoryUnwind() override;
+
+protected:
+  void DoClear() override;
+
+  lldb::RegisterContextSP
+  DoCreateRegisterContextForFrame(StackFrame *frame) override;
+
+  bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
+                             lldb::addr_t &pc,
+                             bool &behaves_like_zeroth_frame) override;
+  uint32_t DoGetFrameCount() override;
+
+private:
+  std::vector<lldb::addr_t> m_pcs;
+  /// This boolean indicates that the PCs in the non-0 frames are call
+  /// addresses and not return addresses.
+  bool m_pcs_are_call_addresses;
+};
+
+} // namespace lldb_private
+
+#endif // LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_HISTORYUNWIND_H