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diff --git a/tools/lli/RemoteTargetMessage.h b/tools/lli/RemoteTargetMessage.h
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+++ b/tools/lli/RemoteTargetMessage.h
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+//===---- RemoteTargetMessage.h - LLI out-of-process message protocol -----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Definition of the LLIMessageType enum which is used for communication with a
+// child process for remote execution.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLI_REMOTETARGETMESSAGE_H
+#define LLI_REMOTETARGETMESSAGE_H
+
+namespace llvm {
+
+// LLI messages from parent-to-child or vice versa follow an exceedingly simple
+// protocol where the first four bytes represent the message type, the next
+// four bytes represent the size of data for the command and following bytes
+// represent the actual data.
+//
+// The protocol is not intended to be robust, secure or fault-tolerant.  It is
+// only here for testing purposes and is therefore intended to be the simplest
+// implementation that will work.  It is assumed that the parent and child
+// share characteristics like endianness.
+
+enum LLIMessageType {
+  LLI_Error = -1,
+  LLI_ChildActive = 0,        // Data = not used
+  LLI_AllocateSpace,          // Data = struct { uint_32t Align, uint_32t Size }
+  LLI_AllocationResult,       // Data = uint64_t AllocAddress (in Child memory space)
+  LLI_LoadCodeSection,        // Data = uint32_t Addr, followed by section contests
+  LLI_LoadDataSection,        // Data = uint32_t Addr, followed by section contents
+  LLI_LoadComplete,           // Data = not used
+  LLI_Execute,                // Data = Address of function to execute
+  LLI_ExecutionResult,        // Data = uint64_t Result
+  LLI_Terminate               // Data = not used
+};
+
+} // end namespace llvm
+
+#endif