[LKH] Add ObjectTransformLayer2.

llvm-svn: 333128

llvm/include/llvm/ExecutionEngine/Orc/ObjectTransformLayer.h

@@ -15,7 +15,7 @@
 #define LLVM_EXECUTIONENGINE_ORC_OBJECTTRANSFORMLAYER_H
 
 #include "llvm/ExecutionEngine/JITSymbol.h"
-#include "llvm/ExecutionEngine/Orc/Core.h"
+#include "llvm/ExecutionEngine/Orc/Layer.h"
 #include <algorithm>
 #include <memory>
 #include <string>
@@ -23,6 +23,23 @@
 namespace llvm {
 namespace orc {
 
+class ObjectTransformLayer2 : public ObjectLayer {
+public:
+  using TransformFunction =
+      std::function<Expected<std::unique_ptr<MemoryBuffer>>(
+          std::unique_ptr<MemoryBuffer>)>;
+
+  ObjectTransformLayer2(ExecutionSession &ES, ObjectLayer &BaseLayer,
+                        TransformFunction Transform);
+
+  void emit(MaterializationResponsibility R, VModuleKey K,
+            std::unique_ptr<MemoryBuffer> O) override;
+
+private:
+  ObjectLayer &BaseLayer;
+  TransformFunction Transform;
+};
+
 /// Object mutating layer.
 ///
 ///   This layer accepts sets of ObjectFiles (via addObject). It

llvm/lib/ExecutionEngine/Orc/CMakeLists.txt

@@ -6,6 +6,7 @@ add_llvm_library(LLVMOrcJIT
   Legacy.cpp
   Layer.cpp
   NullResolver.cpp
+  ObjectTransformLayer.cpp
   OrcABISupport.cpp
   OrcCBindings.cpp
   OrcError.cpp

llvm/lib/ExecutionEngine/Orc/ObjectTransformLayer.cpp

@@ -0,0 +1,34 @@
+//===---------- ObjectTransformLayer.cpp - Object Transform Layer ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/ObjectTransformLayer.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace llvm {
+namespace orc {
+
+ObjectTransformLayer2::ObjectTransformLayer2(ExecutionSession &ES,
+                                             ObjectLayer &BaseLayer,
+                                             TransformFunction Transform)
+    : ObjectLayer(ES), BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
+
+void ObjectTransformLayer2::emit(MaterializationResponsibility R, VModuleKey K,
+                                 std::unique_ptr<MemoryBuffer> O) {
+  assert(O && "Module must not be null");
+
+  if (auto TransformedObj = Transform(std::move(O)))
+    BaseLayer.emit(std::move(R), std::move(K), std::move(*TransformedObj));
+  else {
+    R.failMaterialization();
+    getExecutionSession().reportError(TransformedObj.takeError());
+  }
+}
+
+} // End namespace orc.
+} // End namespace llvm.