1 files changed, 74 insertions, 0 deletions
diff --git a/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h b/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h
new file mode 100644
index 000000000000..2695376fd6e0
--- /dev/null
+++ b/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h
@@ -0,0 +1,74 @@
+//===-- UnwindMacOSXFrameBackchain.h ----------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef lldb_UnwindMacOSXFrameBackchain_h_
+#define lldb_UnwindMacOSXFrameBackchain_h_
+
+// C Includes
+// C++ Includes
+#include <vector>
+
+// Other libraries and framework includes
+
+// Project includes
+#include "lldb/lldb-private.h"
+#include "lldb/Target/Unwind.h"
+
+class UnwindMacOSXFrameBackchain : public lldb_private::Unwind
+{
+public: 
+    UnwindMacOSXFrameBackchain (lldb_private::Thread &thread);
+    
+    virtual
+    ~UnwindMacOSXFrameBackchain()
+    {
+    }
+    
+protected:
+    virtual void
+    DoClear()
+    {
+        m_cursors.clear();
+    }
+
+    virtual uint32_t
+    DoGetFrameCount();
+
+    bool
+    DoGetFrameInfoAtIndex (uint32_t frame_idx,
+                         lldb::addr_t& cfa, 
+                         lldb::addr_t& pc);
+    
+    lldb::RegisterContextSP
+    DoCreateRegisterContextForFrame (lldb_private::StackFrame *frame);
+
+    friend class RegisterContextMacOSXFrameBackchain;
+
+    struct Cursor
+    {
+        lldb::addr_t pc;    // Program counter
+        lldb::addr_t fp;    // Frame pointer for us with backchain
+    };
+
+private:
+    std::vector<Cursor> m_cursors;
+
+    size_t
+    GetStackFrameData_i386 (const lldb_private::ExecutionContext &exe_ctx);
+
+    size_t
+    GetStackFrameData_x86_64 (const lldb_private::ExecutionContext &exe_ctx);
+
+    //------------------------------------------------------------------
+    // For UnwindMacOSXFrameBackchain only
+    //------------------------------------------------------------------
+    DISALLOW_COPY_AND_ASSIGN (UnwindMacOSXFrameBackchain);
+};
+
+#endif  // lldb_UnwindMacOSXFrameBackchain_h_