llvm/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/MC/TargetRegistry.h"
  12 #include "llvm/Support/raw_ostream.h"
  13 #include "llvm/TargetParser/Host.h"
  14
  15 namespace llvm {
  16 namespace orc {
  17
  18 JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
  19     : TT(std::move(TT)) {
  20   Options.EmulatedTLS = true;
  21   Options.UseInitArray = true;
  22 }
  23
  24 Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
  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   for (const auto &Feature : llvm::sys::getHostCPUFeatures())
  31     TMBuilder.getFeatures().AddFeature(Feature.first(), Feature.second);
  32
  33   TMBuilder.setCPU(std::string(llvm::sys::getHostCPUName()));
  34
  35   return TMBuilder;
  36 }
  37
  38 Expected<std::unique_ptr<TargetMachine>>
  39 JITTargetMachineBuilder::createTargetMachine() {
  40
  41   std::string ErrMsg;
  42   auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
  43   if (!TheTarget)
  44     return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
  45
  46   if (!TheTarget->hasJIT())
  47     return make_error<StringError>("Target has no JIT support",
  48                                    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 #ifndef NDEBUG
  68 void JITTargetMachineBuilderPrinter::print(raw_ostream &OS) const {
  69   OS << Indent << "{\n"
  70      << Indent << "  Triple = \"" << JTMB.TT.str() << "\"\n"
  71      << Indent << "  CPU = \"" << JTMB.CPU << "\"\n"
  72      << Indent << "  Features = \"" << JTMB.Features.getString() << "\"\n"
  73      << Indent << "  Options = <not-printable>\n"
  74      << Indent << "  Relocation Model = ";
  75
  76   if (JTMB.RM) {
  77     switch (*JTMB.RM) {
  78     case Reloc::Static:
  79       OS << "Static";
  80       break;
  81     case Reloc::PIC_:
  82       OS << "PIC_";
  83       break;
  84     case Reloc::DynamicNoPIC:
  85       OS << "DynamicNoPIC";
  86       break;
  87     case Reloc::ROPI:
  88       OS << "ROPI";
  89       break;
  90     case Reloc::RWPI:
  91       OS << "RWPI";
  92       break;
  93     case Reloc::ROPI_RWPI:
  94       OS << "ROPI_RWPI";
  95       break;
  96     }
  97   } else
  98     OS << "unspecified (will use target default)";
  99
 100   OS << "\n"
 101      << Indent << "  Code Model = ";
 102
 103   if (JTMB.CM) {
 104     switch (*JTMB.CM) {
 105     case CodeModel::Tiny:
 106       OS << "Tiny";
 107       break;
 108     case CodeModel::Small:
 109       OS << "Small";
 110       break;
 111     case CodeModel::Kernel:
 112       OS << "Kernel";
 113       break;
 114     case CodeModel::Medium:
 115       OS << "Medium";
 116       break;
 117     case CodeModel::Large:
 118       OS << "Large";
 119       break;
 120     }
 121   } else
 122     OS << "unspecified (will use target default)";
 123
 124   OS << "\n"
 125      << Indent << "  Optimization Level = ";
 126   switch (JTMB.OptLevel) {
 127   case CodeGenOptLevel::None:
 128     OS << "None";
 129     break;
 130   case CodeGenOptLevel::Less:
 131     OS << "Less";
 132     break;
 133   case CodeGenOptLevel::Default:
 134     OS << "Default";
 135     break;
 136   case CodeGenOptLevel::Aggressive:
 137     OS << "Aggressive";
 138     break;
 139   }
 140
 141   OS << "\n" << Indent << "}\n";
 142 }
 143 #endif // NDEBUG
 144
 145 } // End namespace orc.
 146 } // End namespace llvm.