[Orc] Add error codes and a new std::error_category for remote-jit errors.

These will be used by an upcoming patch that adds remote-jit support utilities
to ORC.

llvm-svn: 257297

include/llvm/ExecutionEngine/Orc/OrcError.h

@@ -0,0 +1,37 @@
+//===------ OrcError.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.
+//
+//===----------------------------------------------------------------------===//
+//
+//   Define an error category, error codes, and helper utilities for Orc.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORC_ORCERROR_H
+#define LLVM_EXECUTIONENGINE_ORC_ORCERROR_H
+
+#include <system_error>
+
+namespace llvm {
+namespace orc {
+
+enum class OrcErrorCode : int {
+  // RPC Errors
+  RemoteAllocatorDoesNotExist = 1,
+  RemoteAllocatorIdAlreadyInUse,
+  RemoteMProtectAddrUnrecognized,
+  RemoteIndirectStubsOwnerDoesNotExist,
+  RemoteIndirectStubsOwnerIdAlreadyInUse,
+  UnexpectedRPCCall
+};
+
+std::error_code orcError(OrcErrorCode ErrCode);
+
+} // End namespace orc.
+} // End namespace llvm.
+
+#endif // LLVM_EXECUTIONENGINE_ORC_ORCERROR_H

lib/ExecutionEngine/Orc/CMakeLists.txt

@@ -4,6 +4,7 @@ add_llvm_library(LLVMOrcJIT
   NullResolver.cpp
   OrcCBindings.cpp
   OrcCBindingsStack.cpp
+  OrcError.cpp
   OrcMCJITReplacement.cpp
   OrcTargetSupport.cpp
 

lib/ExecutionEngine/Orc/OrcError.cpp

@@ -0,0 +1,57 @@
+//===---------------- OrcError.cpp - Error codes for ORC ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Error codes for ORC.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/OrcError.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
+
+using namespace llvm;
+using namespace llvm::orc;
+
+namespace {
+
+class OrcErrorCategory : public std::error_category {
+public:
+  const char *name() const LLVM_NOEXCEPT override { return "orc"; }
+
+  std::string message(int condition) const override {
+    switch (static_cast<OrcErrorCode>(condition)) {
+    case OrcErrorCode::RemoteAllocatorDoesNotExist:
+      return "Remote allocator does not exist";
+    case OrcErrorCode::RemoteAllocatorIdAlreadyInUse:
+      return "Remote allocator Id already in use";
+    case OrcErrorCode::RemoteMProtectAddrUnrecognized:
+      return "Remote mprotect call references unallocated memory";
+    case OrcErrorCode::RemoteIndirectStubsOwnerDoesNotExist:
+      return "Remote indirect stubs owner does not exist";
+    case OrcErrorCode::RemoteIndirectStubsOwnerIdAlreadyInUse:
+      return "Remote indirect stubs owner Id already in use";
+    case OrcErrorCode::UnexpectedRPCCall:
+      return "Unexpected RPC call";
+    }
+    llvm_unreachable("Unhandled error code");
+  }
+};
+
+static ManagedStatic<OrcErrorCategory> OrcErrCat;
+}
+
+namespace llvm {
+namespace orc {
+
+std::error_code orcError(OrcErrorCode ErrCode) {
+  typedef std::underlying_type<OrcErrorCode>::type UT;
+  return std::error_code(static_cast<UT>(ErrCode), *OrcErrCat);
+}
+}
+}