[ORC] Add NullResolver

Summary:
This is an implementation of RuntimeDyld::SymbolResolver that simply
rejects all resolution requests; useful for clients that do not have any
cross-object symbol references.

Reviewers: lhames

Reviewed By: lhames

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10455

llvm-svn: 240288

3 files changed, 76 insertions, 12 deletions

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/NullResolver.h b/llvm/include/llvm/ExecutionEngine/Orc/NullResolver.h
new file mode 100644
index 00000000000..df1d9e8518d
--- /dev/null
+++ b/llvm/include/llvm/ExecutionEngine/Orc/NullResolver.h
@@ -0,0 +1,36 @@
+//===------ NullResolver.h - Reject symbol lookup requests ------*- C++ -*-===//

+//

+//                     The LLVM Compiler Infrastructure

+//

+// This file is distributed under the University of Illinois Open Source

+// License. See LICENSE.TXT for details.

+//

+//===----------------------------------------------------------------------===//

+//

+//   Defines a RuntimeDyld::SymbolResolver subclass that rejects all symbol

+// resolution requests, for clients that have no cross-object fixups.

+//

+//===----------------------------------------------------------------------===//

+

+#ifndef LLVM_EXECUTIONENGINE_ORC_NULLRESOLVER_H

+#define LLVM_EXECUTIONENGINE_ORC_NULLRESOLVER_H

+

+#include "llvm/ExecutionEngine/RuntimeDyld.h"

+

+namespace llvm {

+namespace orc {

+

+/// SymbolResolver impliementation that rejects all resolution requests.

+/// Useful for clients that have no cross-object fixups.

+class NullResolver : public RuntimeDyld::SymbolResolver {

+public:

+  RuntimeDyld::SymbolInfo findSymbol(const std::string &Name) final;

+

+  RuntimeDyld::SymbolInfo

+  findSymbolInLogicalDylib(const std::string &Name) final;

+};

+

+} // End namespace orc.

+} // End namespace llvm.

+

+#endif // LLVM_EXECUTIONENGINE_ORC_NULLRESOLVER_H

diff --git a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
index 1da164237a6..05fb5a30bcd 100644
--- a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
+++ b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
@@ -1,12 +1,13 @@
-add_llvm_library(LLVMOrcJIT
-  ExecutionUtils.cpp
-  IndirectionUtils.cpp
-  OrcMCJITReplacement.cpp
-  OrcTargetSupport.cpp
-
-  ADDITIONAL_HEADER_DIRS
-  ${LLVM_MAIN_INCLUDE_DIR}/llvm/ExecutionEngine/Orc
-
-  DEPENDS
-  intrinsics_gen
-  )
+add_llvm_library(LLVMOrcJIT

+  ExecutionUtils.cpp

+  IndirectionUtils.cpp

+  NullResolver.cpp

+  OrcMCJITReplacement.cpp

+  OrcTargetSupport.cpp

+

+  ADDITIONAL_HEADER_DIRS

+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/ExecutionEngine/Orc

+

+  DEPENDS

+  intrinsics_gen

+  )

diff --git a/llvm/lib/ExecutionEngine/Orc/NullResolver.cpp b/llvm/lib/ExecutionEngine/Orc/NullResolver.cpp
new file mode 100644
index 00000000000..5b91b0acbaa
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/Orc/NullResolver.cpp
@@ -0,0 +1,27 @@
+//===---------- NullResolver.cpp - Reject symbol lookup requests ----------===//

+//

+//                     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/NullResolver.h"

+

+#include "llvm/Support/ErrorHandling.h"

+

+namespace llvm {

+namespace orc {

+

+RuntimeDyld::SymbolInfo NullResolver::findSymbol(const std::string &Name) {

+  llvm_unreachable("Unexpected cross-object symbol reference");

+}

+

+RuntimeDyld::SymbolInfo

+NullResolver::findSymbolInLogicalDylib(const std::string &Name) {

+  llvm_unreachable("Unexpected cross-object symbol reference");

+}

+

+} // End namespace orc.

+} // End namespace llvm.