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 
14 namespace llvm {
15 namespace orc {
16 
17 JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
18     : TT(std::move(TT)) {
19   Options.EmulatedTLS = true;
20   Options.ExplicitEmulatedTLS = true;
21 }
22 
23 Expected<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 
41 Expected<std::unique_ptr<TargetMachine>>
42 JITTargetMachineBuilder::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 
59 JITTargetMachineBuilder &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