1 files changed, 69 insertions, 0 deletions
diff --git a/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp b/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp
new file mode 100644
index 000000000000..1d3e6db913e2
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp
@@ -0,0 +1,69 @@
+//===----- JITTargetMachineBuilder.cpp - Build TargetMachines for JIT -----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/JITTargetMachineBuilder.h"
+
+#include "llvm/Support/Host.h"
+#include "llvm/Support/TargetRegistry.h"
+
+namespace llvm {
+namespace orc {
+
+JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
+    : TT(std::move(TT)) {
+  Options.EmulatedTLS = true;
+  Options.ExplicitEmulatedTLS = true;
+}
+
+Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
+  // FIXME: getProcessTriple is bogus. It returns the host LLVM was compiled on,
+  //        rather than a valid triple for the current process.
+  JITTargetMachineBuilder TMBuilder((Triple(sys::getProcessTriple())));
+
+  // Retrieve host CPU name and sub-target features and add them to builder.
+  // Relocation model, code model and codegen opt level are kept to default
+  // values.
+  llvm::SubtargetFeatures SubtargetFeatures;
+  llvm::StringMap<bool> FeatureMap;
+  llvm::sys::getHostCPUFeatures(FeatureMap);
+  for (auto &Feature : FeatureMap)
+    SubtargetFeatures.AddFeature(Feature.first(), Feature.second);
+
+  TMBuilder.setCPU(llvm::sys::getHostCPUName());
+  TMBuilder.addFeatures(SubtargetFeatures.getFeatures());
+
+  return TMBuilder;
+}
+
+Expected<std::unique_ptr<TargetMachine>>
+JITTargetMachineBuilder::createTargetMachine() {
+
+  std::string ErrMsg;
+  auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
+  if (!TheTarget)
+    return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
+
+  auto *TM =
+      TheTarget->createTargetMachine(TT.getTriple(), CPU, Features.getString(),
+                                     Options, RM, CM, OptLevel, /*JIT*/ true);
+  if (!TM)
+    return make_error<StringError>("Could not allocate target machine",
+                                   inconvertibleErrorCode());
+
+  return std::unique_ptr<TargetMachine>(TM);
+}
+
+JITTargetMachineBuilder &JITTargetMachineBuilder::addFeatures(
+    const std::vector<std::string> &FeatureVec) {
+  for (const auto &F : FeatureVec)
+    Features.AddFeature(F);
+  return *this;
+}
+
+} // End namespace orc.
+} // End namespace llvm.