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
JITTargetMachineBuilder(Triple TT)18 JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
19 : TT(std::move(TT)) {
20 Options.EmulatedTLS = true;
21 Options.ExplicitEmulatedTLS = true;
22 Options.UseInitArray = true;
23 }
24
detectHost()25 Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
26 // FIXME: getProcessTriple is bogus. It returns the host LLVM was compiled on,
27 // rather than a valid triple for the current process.
28 JITTargetMachineBuilder TMBuilder((Triple(sys::getProcessTriple())));
29
30 // Retrieve host CPU name and sub-target features and add them to builder.
31 // Relocation model, code model and codegen opt level are kept to default
32 // values.
33 llvm::StringMap<bool> FeatureMap;
34 llvm::sys::getHostCPUFeatures(FeatureMap);
35 for (auto &Feature : FeatureMap)
36 TMBuilder.getFeatures().AddFeature(Feature.first(), Feature.second);
37
38 TMBuilder.setCPU(std::string(llvm::sys::getHostCPUName()));
39
40 return TMBuilder;
41 }
42
43 Expected<std::unique_ptr<TargetMachine>>
createTargetMachine()44 JITTargetMachineBuilder::createTargetMachine() {
45
46 std::string ErrMsg;
47 auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
48 if (!TheTarget)
49 return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
50
51 if (!TheTarget->hasJIT())
52 return make_error<StringError>("Target has no JIT support",
53 inconvertibleErrorCode());
54
55 auto *TM =
56 TheTarget->createTargetMachine(TT.getTriple(), CPU, Features.getString(),
57 Options, RM, CM, OptLevel, /*JIT*/ true);
58 if (!TM)
59 return make_error<StringError>("Could not allocate target machine",
60 inconvertibleErrorCode());
61
62 return std::unique_ptr<TargetMachine>(TM);
63 }
64
addFeatures(const std::vector<std::string> & FeatureVec)65 JITTargetMachineBuilder &JITTargetMachineBuilder::addFeatures(
66 const std::vector<std::string> &FeatureVec) {
67 for (const auto &F : FeatureVec)
68 Features.AddFeature(F);
69 return *this;
70 }
71
72 #ifndef NDEBUG
print(raw_ostream & OS) const73 void JITTargetMachineBuilderPrinter::print(raw_ostream &OS) const {
74 OS << Indent << "{\n"
75 << Indent << " Triple = \"" << JTMB.TT.str() << "\"\n"
76 << Indent << " CPU = \"" << JTMB.CPU << "\"\n"
77 << Indent << " Features = \"" << JTMB.Features.getString() << "\"\n"
78 << Indent << " Options = <not-printable>\n"
79 << Indent << " Relocation Model = ";
80
81 if (JTMB.RM) {
82 switch (*JTMB.RM) {
83 case Reloc::Static:
84 OS << "Static";
85 break;
86 case Reloc::PIC_:
87 OS << "PIC_";
88 break;
89 case Reloc::DynamicNoPIC:
90 OS << "DynamicNoPIC";
91 break;
92 case Reloc::ROPI:
93 OS << "ROPI";
94 break;
95 case Reloc::RWPI:
96 OS << "RWPI";
97 break;
98 case Reloc::ROPI_RWPI:
99 OS << "ROPI_RWPI";
100 break;
101 }
102 } else
103 OS << "unspecified (will use target default)";
104
105 OS << "\n"
106 << Indent << " Code Model = ";
107
108 if (JTMB.CM) {
109 switch (*JTMB.CM) {
110 case CodeModel::Tiny:
111 OS << "Tiny";
112 break;
113 case CodeModel::Small:
114 OS << "Small";
115 break;
116 case CodeModel::Kernel:
117 OS << "Kernel";
118 break;
119 case CodeModel::Medium:
120 OS << "Medium";
121 break;
122 case CodeModel::Large:
123 OS << "Large";
124 break;
125 }
126 } else
127 OS << "unspecified (will use target default)";
128
129 OS << "\n"
130 << Indent << " Optimization Level = ";
131 switch (JTMB.OptLevel) {
132 case CodeGenOpt::None:
133 OS << "None";
134 break;
135 case CodeGenOpt::Less:
136 OS << "Less";
137 break;
138 case CodeGenOpt::Default:
139 OS << "Default";
140 break;
141 case CodeGenOpt::Aggressive:
142 OS << "Aggressive";
143 break;
144 }
145
146 OS << "\n" << Indent << "}\n";
147 }
148 #endif // NDEBUG
149
150 } // End namespace orc.
151 } // End namespace llvm.
152