lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp

   1 //===----- JITTargetMachineBuilder.cpp - Build TargetMachines for JIT -----===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ExecutionEngine/Orc/JITTargetMachineBuilder.h"
  10
  11 #include "llvm/Support/TargetRegistry.h"
  12
  13 namespace llvm {
  14 namespace orc {
  15
  16 JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
  17     : TT(std::move(TT)) {
  18   Options.EmulatedTLS = true;
  19   Options.ExplicitEmulatedTLS = true;
  20 }
  21
  22 Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
  23   // FIXME: getProcessTriple is bogus. It returns the host LLVM was compiled on,
  24   //        rather than a valid triple for the current process.
  25   JITTargetMachineBuilder TMBuilder((Triple(sys::getProcessTriple())));
  26
  27   // Retrieve host CPU name and sub-target features and add them to builder.
  28   // Relocation model, code model and codegen opt level are kept to default
  29   // values.
  30   llvm::SubtargetFeatures SubtargetFeatures;
  31   llvm::StringMap<bool> FeatureMap;
  32   llvm::sys::getHostCPUFeatures(FeatureMap);
  33   for (auto &Feature : FeatureMap)
  34     SubtargetFeatures.AddFeature(Feature.first(), Feature.second);
  35
  36   TMBuilder.setCPU(llvm::sys::getHostCPUName());
  37   TMBuilder.addFeatures(SubtargetFeatures.getFeatures());
  38
  39   return TMBuilder;
  40 }
  41
  42 Expected<std::unique_ptr<TargetMachine>>
  43 JITTargetMachineBuilder::createTargetMachine() {
  44
  45   std::string ErrMsg;
  46   auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
  47   if (!TheTarget)
  48     return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
  49
  50   auto *TM =
  51       TheTarget->createTargetMachine(TT.getTriple(), CPU, Features.getString(),
  52                                      Options, RM, CM, OptLevel, /*JIT*/ true);
  53   if (!TM)
  54     return make_error<StringError>("Could not allocate target machine",
  55                                    inconvertibleErrorCode());
  56
  57   return std::unique_ptr<TargetMachine>(TM);
  58 }
  59
  60 JITTargetMachineBuilder &JITTargetMachineBuilder::addFeatures(
  61     const std::vector<std::string> &FeatureVec) {
  62   for (const auto &F : FeatureVec)
  63     Features.AddFeature(F);
  64   return *this;
  65 }
  66
  67 } // End namespace orc.
  68 } // End namespace llvm.