1 files changed, 77 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h b/lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h
new file mode 100644
index 00000000000..86ba6e7ae7f
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+++ b/lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h
@@ -0,0 +1,77 @@
+//===-- 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()
+    {
+    }
+    
+    virtual void
+    Clear()
+    {
+        m_cursors.clear();
+    }
+
+    virtual uint32_t
+    GetFrameCount();
+
+    bool
+    GetFrameInfoAtIndex (uint32_t frame_idx,
+                         lldb::addr_t& cfa, 
+                         lldb::addr_t& pc);
+    
+    lldb_private::RegisterContext *
+    CreateRegisterContextForFrame (lldb_private::StackFrame *frame);
+
+    lldb_private::Thread &
+    GetThread();
+
+protected:
+    friend class RegisterContextMacOSXFrameBackchain;
+
+    typedef 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 (lldb_private::StackFrame *first_frame);
+
+    size_t
+    GetStackFrameData_x86_64 (lldb_private::StackFrame *first_frame);
+
+    //------------------------------------------------------------------
+    // For UnwindMacOSXFrameBackchain only
+    //------------------------------------------------------------------
+    DISALLOW_COPY_AND_ASSIGN (UnwindMacOSXFrameBackchain);
+};
+
+#endif  // lldb_UnwindMacOSXFrameBackchain_h_