1 files changed, 71 insertions, 0 deletions
diff --git a/include/lldb/Target/RegisterCheckpoint.h b/include/lldb/Target/RegisterCheckpoint.h
new file mode 100644
index 0000000000000..3e61e1490d4b3
--- /dev/null
+++ b/include/lldb/Target/RegisterCheckpoint.h
@@ -0,0 +1,71 @@
+//===-- RegisterCheckpoint.h ------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_RegisterCheckpoint_h_
+#define liblldb_RegisterCheckpoint_h_
+
+#include "lldb/lldb-private.h"
+#include "lldb/Core/UserID.h"
+#include "lldb/Target/StackID.h"
+
+namespace lldb_private {
+
+    // Inherit from UserID in case pushing/popping all register values can be
+    // done using a 64 bit integer that holds a baton/cookie instead of actually
+    // having to read all register values into a buffer
+    class RegisterCheckpoint : public UserID
+    {
+    public:
+        
+        enum class Reason {
+            // An expression is about to be run on the thread if the protocol that
+            // talks to the debuggee supports checkpointing the registers using a
+            // push/pop then the UserID base class in the RegisterCheckpoint can
+            // be used to store the baton/cookie that refers to the remote saved
+            // state.
+            eExpression,
+            // The register checkpoint wants the raw register bytes, so they must
+            // be read into m_data_sp, or the save/restore checkpoint should fail.
+            eDataBackup
+        };
+        
+        RegisterCheckpoint(Reason reason) :
+            UserID(0),
+            m_data_sp (),
+            m_reason(reason)
+        {
+        }
+        
+        ~RegisterCheckpoint()
+        {
+        }
+        
+        lldb::DataBufferSP &
+        GetData()
+        {
+            return m_data_sp;
+        }
+        
+        const lldb::DataBufferSP &
+        GetData() const
+        {
+            return m_data_sp;
+        }
+        
+    protected:
+        lldb::DataBufferSP m_data_sp;
+        Reason m_reason;
+        
+        // Make RegisterCheckpointSP if you wish to share the data in this class.
+        DISALLOW_COPY_AND_ASSIGN(RegisterCheckpoint);
+    };
+    
+} // namespace lldb_private
+
+#endif  // liblldb_RegisterCheckpoint_h_