Adding object caching support to MCJIT

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180146 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ExecutionEngine/ObjectCache.h

@@ -0,0 +1,54 @@
+//===-- ObjectCache.h - Class definition for the ObjectCache -----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_OBJECTCACHE_H
+#define LLVM_LIB_EXECUTIONENGINE_OBJECTCACHE_H
+
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace llvm {
+
+class Module;
+
+/// This is the base ObjectCache type which can be provided to an
+/// ExecutionEngine for the purpose of avoiding compilation for Modules that
+/// have already been compiled and an object file is available.
+class ObjectCache {
+public:
+  ObjectCache() { }
+
+  virtual ~ObjectCache() { }
+
+  /// notifyObjectCompiled - Provides a pointer to compiled code for Module M.
+  virtual void notifyObjectCompiled(const Module *M, const MemoryBuffer *Obj) = 0;
+
+  /// getObjectCopy - Returns a pointer to a newly allocated MemoryBuffer that
+  /// contains the object which corresponds with Module M, or 0 if an object is
+  /// not available. The caller owns the MemoryBuffer returned by this function.
+  MemoryBuffer* getObjectCopy(const Module* M) {
+    const MemoryBuffer* Obj = getObject(M);
+    if (Obj)
+      return MemoryBuffer::getMemBufferCopy(Obj->getBuffer());
+    else
+      return 0;
+  }
+
+protected:
+  /// getObject - Returns a pointer to a MemoryBuffer that contains an object
+  /// that corresponds with Module M, or 0 if an object is not available.
+  /// The pointer returned by this function is not suitable for loading because
+  /// the memory is read-only and owned by the ObjectCache. To retrieve an
+  /// owning pointer to a MemoryBuffer (which is suitable for calling
+  /// RuntimeDyld::loadObject() with) use getObjectCopy() instead.
+  virtual const MemoryBuffer* getObject(const Module* M) = 0;
+};
+
+}
+
+#endif