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diff --git a/lib/ExecutionEngine/MCJIT/MCJITMemoryManager.h b/lib/ExecutionEngine/MCJIT/MCJITMemoryManager.h
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index 000000000000..e3c6fda63b48
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+++ b/lib/ExecutionEngine/MCJIT/MCJITMemoryManager.h
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+//===-- MCJITMemoryManager.h - Definition for the Memory Manager ---C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_EXECUTIONENGINE_MCJITMEMORYMANAGER_H
+#define LLVM_LIB_EXECUTIONENGINE_MCJITMEMORYMANAGER_H
+
+#include "llvm/Module.h"
+#include "llvm/ExecutionEngine/JITMemoryManager.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include <assert.h>
+
+namespace llvm {
+
+// The MCJIT memory manager is a layer between the standard JITMemoryManager
+// and the RuntimeDyld interface that maps objects, by name, onto their
+// matching LLVM IR counterparts in the module(s) being compiled.
+class MCJITMemoryManager : public RTDyldMemoryManager {
+  JITMemoryManager *JMM;
+
+  // FIXME: Multiple modules.
+  Module *M;
+public:
+  MCJITMemoryManager(JITMemoryManager *jmm) : JMM(jmm) {}
+
+  // Allocate ActualSize bytes, or more, for the named function. Return
+  // a pointer to the allocated memory and update Size to reflect how much
+  // memory was acutally allocated.
+  uint8_t *startFunctionBody(const char *Name, uintptr_t &Size) {
+    // FIXME: This should really reference the MCAsmInfo to get the global
+    //        prefix.
+    if (Name[0] == '_') ++Name;
+    Function *F = M->getFunction(Name);
+    assert(F && "No matching function in JIT IR Module!");
+    return JMM->startFunctionBody(F, Size);
+  }
+
+  // Mark the end of the function, including how much of the allocated
+  // memory was actually used.
+  void endFunctionBody(const char *Name, uint8_t *FunctionStart,
+                       uint8_t *FunctionEnd) {
+    // FIXME: This should really reference the MCAsmInfo to get the global
+    //        prefix.
+    if (Name[0] == '_') ++Name;
+    Function *F = M->getFunction(Name);
+    assert(F && "No matching function in JIT IR Module!");
+    JMM->endFunctionBody(F, FunctionStart, FunctionEnd);
+  }
+
+};
+
+} // End llvm namespace
+
+#endif