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annotate lib/ExecutionEngine/TargetSelect.cpp @ 15:66597e792247

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minor fix
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 17 Sep 2013 21:32:34 +0900
parents 9ad51c7bc036
children
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1 //===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This just asks the TargetRegistry for the appropriate target to use, and
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11 // allows the user to specify a specific one on the commandline with -march=x,
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12 // -mcpu=y, and -mattr=a,-b,+c. Clients should initialize targets prior to
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13 // calling selectTarget().
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #include "llvm/ExecutionEngine/ExecutionEngine.h"
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18 #include "llvm/ADT/Triple.h"
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19 #include "llvm/IR/Module.h"
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20 #include "llvm/MC/SubtargetFeature.h"
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21 #include "llvm/Support/CommandLine.h"
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22 #include "llvm/Support/Host.h"
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23 #include "llvm/Support/TargetRegistry.h"
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24 #include "llvm/Target/TargetMachine.h"
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25
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26 using namespace llvm;
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28 TargetMachine *EngineBuilder::selectTarget() {
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29 Triple TT;
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30
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31 // MCJIT can generate code for remote targets, but the old JIT and Interpreter
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32 // must use the host architecture.
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33 if (UseMCJIT && WhichEngine != EngineKind::Interpreter && M)
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34 TT.setTriple(M->getTargetTriple());
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35
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36 return selectTarget(TT, MArch, MCPU, MAttrs);
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37 }
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38
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39 /// selectTarget - Pick a target either via -march or by guessing the native
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40 /// arch. Add any CPU features specified via -mcpu or -mattr.
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41 TargetMachine *EngineBuilder::selectTarget(const Triple &TargetTriple,
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42 StringRef MArch,
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43 StringRef MCPU,
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44 const SmallVectorImpl<std::string>& MAttrs) {
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45 Triple TheTriple(TargetTriple);
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46 if (TheTriple.getTriple().empty())
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47 TheTriple.setTriple(sys::getProcessTriple());
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48
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49 // Adjust the triple to match what the user requested.
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50 const Target *TheTarget = 0;
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51 if (!MArch.empty()) {
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52 for (TargetRegistry::iterator it = TargetRegistry::begin(),
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53 ie = TargetRegistry::end(); it != ie; ++it) {
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54 if (MArch == it->getName()) {
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55 TheTarget = &*it;
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56 break;
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57 }
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58 }
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59
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60 if (!TheTarget) {
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61 if (ErrorStr)
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62 *ErrorStr = "No available targets are compatible with this -march, "
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63 "see -version for the available targets.\n";
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64 return 0;
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65 }
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66
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67 // Adjust the triple to match (if known), otherwise stick with the
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68 // requested/host triple.
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69 Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch);
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70 if (Type != Triple::UnknownArch)
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71 TheTriple.setArch(Type);
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72 } else {
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73 std::string Error;
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74 TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Error);
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75 if (TheTarget == 0) {
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76 if (ErrorStr)
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77 *ErrorStr = Error;
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78 return 0;
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79 }
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80 }
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81
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82 // Package up features to be passed to target/subtarget
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83 std::string FeaturesStr;
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84 if (!MAttrs.empty()) {
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85 SubtargetFeatures Features;
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86 for (unsigned i = 0; i != MAttrs.size(); ++i)
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87 Features.AddFeature(MAttrs[i]);
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88 FeaturesStr = Features.getString();
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89 }
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90
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91 // Allocate a target...
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92 TargetMachine *Target = TheTarget->createTargetMachine(TheTriple.getTriple(),
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93 MCPU, FeaturesStr,
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94 Options,
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95 RelocModel, CMModel,
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96 OptLevel);
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97 assert(Target && "Could not allocate target machine!");
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98 return Target;
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99 }