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/Host.h"
13 #include "llvm/Support/raw_ostream.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.ExplicitEmulatedTLS = true;
22 }
23 
24 Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
25   // FIXME: getProcessTriple is bogus. It returns the host LLVM was compiled on,
26   //        rather than a valid triple for the current process.
27   JITTargetMachineBuilder TMBuilder((Triple(sys::getProcessTriple())));
28 
29   // Retrieve host CPU name and sub-target features and add them to builder.
30   // Relocation model, code model and codegen opt level are kept to default
31   // values.
32   llvm::StringMap<bool> FeatureMap;
33   llvm::sys::getHostCPUFeatures(FeatureMap);
34   for (auto &Feature : FeatureMap)
35     TMBuilder.getFeatures().AddFeature(Feature.first(), Feature.second);
36 
37   TMBuilder.setCPU(std::string(llvm::sys::getHostCPUName()));
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 #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 CodeGenOpt::None:
128     OS << "None";
129     break;
130   case CodeGenOpt::Less:
131     OS << "Less";
132     break;
133   case CodeGenOpt::Default:
134     OS << "Default";
135     break;
136   case CodeGenOpt::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.
147