Add missing file from r128851.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128856 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/MCJIT/MCJITMemoryManager.h

@@ -0,0 +1,58 @@
+//===-- 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.
+  uint64_t startFunctionBody(const char *Name, uintptr_t &Size) {
+    Function *F = M->getFunction(Name);
+    assert(F && "No matching function in JIT IR Module!");
+    return (uint64_t)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, uint64_t FunctionStart,
+                       uint64_t FunctionEnd) {
+    Function *F = M->getFunction(Name);
+    assert(F && "No matching function in JIT IR Module!");
+    // The JITMemoryManager interface makes the unfortunate assumption that
+    // the address space/sizes we're compiling on are the same as what we're
+    // compiling for, so it uses pointer types for its addresses. Explicit
+    // casts between them to deal with that.
+    return JMM->endFunctionBody(F, (uint8_t*)FunctionStart,
+                                (uint8_t*)FunctionEnd);
+  }
+
+};
+
+} // End llvm namespace
+
+#endif