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