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annotate lib/IR/PassRegistry.cpp @ 124:4fa72497ed5d

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fix
author mir3636
date Thu, 30 Nov 2017 20:04:56 +0900
parents 803732b1fca8
children c2174574ed3a
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1 //===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
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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 file implements the PassRegistry, with which passes are registered on
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11 // initialization, and supports the PassManager in dependency resolution.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/PassRegistry.h"
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16 #include "llvm/ADT/STLExtras.h"
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17 #include "llvm/PassInfo.h"
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18 #include "llvm/PassSupport.h"
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19 #include "llvm/Support/ManagedStatic.h"
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20 #include <cassert>
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21 #include <memory>
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22 #include <utility>
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23
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24 using namespace llvm;
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25
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26 // FIXME: We use ManagedStatic to erase the pass registrar on shutdown.
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27 // Unfortunately, passes are registered with static ctors, and having
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28 // llvm_shutdown clear this map prevents successful resurrection after
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29 // llvm_shutdown is run. Ideally we should find a solution so that we don't
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30 // leak the map, AND can still resurrect after shutdown.
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31 static ManagedStatic<PassRegistry> PassRegistryObj;
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32 PassRegistry *PassRegistry::getPassRegistry() {
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33 return &*PassRegistryObj;
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34 }
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35
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36 //===----------------------------------------------------------------------===//
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37 // Accessors
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38 //
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39
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40 PassRegistry::~PassRegistry() = default;
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41
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42 const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
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43 sys::SmartScopedReader<true> Guard(Lock);
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44 MapType::const_iterator I = PassInfoMap.find(TI);
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45 return I != PassInfoMap.end() ? I->second : nullptr;
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46 }
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47
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48 const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
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49 sys::SmartScopedReader<true> Guard(Lock);
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50 StringMapType::const_iterator I = PassInfoStringMap.find(Arg);
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51 return I != PassInfoStringMap.end() ? I->second : nullptr;
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52 }
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53
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54 //===----------------------------------------------------------------------===//
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55 // Pass Registration mechanism
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56 //
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57
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58 void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
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59 sys::SmartScopedWriter<true> Guard(Lock);
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60 bool Inserted =
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61 PassInfoMap.insert(std::make_pair(PI.getTypeInfo(), &PI)).second;
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62 assert(Inserted && "Pass registered multiple times!");
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63 (void)Inserted;
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64 PassInfoStringMap[PI.getPassArgument()] = &PI;
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65
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66 // Notify any listeners.
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67 for (auto *Listener : Listeners)
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68 Listener->passRegistered(&PI);
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69
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70 if (ShouldFree)
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71 ToFree.push_back(std::unique_ptr<const PassInfo>(&PI));
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72 }
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73
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74 void PassRegistry::enumerateWith(PassRegistrationListener *L) {
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75 sys::SmartScopedReader<true> Guard(Lock);
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76 for (auto PassInfoPair : PassInfoMap)
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77 L->passEnumerate(PassInfoPair.second);
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78 }
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79
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80 /// Analysis Group Mechanisms.
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81 void PassRegistry::registerAnalysisGroup(const void *InterfaceID,
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82 const void *PassID,
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83 PassInfo &Registeree, bool isDefault,
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84 bool ShouldFree) {
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85 PassInfo *InterfaceInfo = const_cast<PassInfo *>(getPassInfo(InterfaceID));
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86 if (!InterfaceInfo) {
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87 // First reference to Interface, register it now.
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88 registerPass(Registeree);
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89 InterfaceInfo = &Registeree;
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90 }
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91 assert(Registeree.isAnalysisGroup() &&
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92 "Trying to join an analysis group that is a normal pass!");
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93
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94 if (PassID) {
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95 PassInfo *ImplementationInfo = const_cast<PassInfo *>(getPassInfo(PassID));
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96 assert(ImplementationInfo &&
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97 "Must register pass before adding to AnalysisGroup!");
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98
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99 sys::SmartScopedWriter<true> Guard(Lock);
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100
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101 // Make sure we keep track of the fact that the implementation implements
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102 // the interface.
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103 ImplementationInfo->addInterfaceImplemented(InterfaceInfo);
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104
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105 if (isDefault) {
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106 assert(InterfaceInfo->getNormalCtor() == nullptr &&
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107 "Default implementation for analysis group already specified!");
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108 assert(
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109 ImplementationInfo->getNormalCtor() &&
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110 "Cannot specify pass as default if it does not have a default ctor");
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111 InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
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112 }
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113 }
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114
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115 if (ShouldFree)
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116 ToFree.push_back(std::unique_ptr<const PassInfo>(&Registeree));
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117 }
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118
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119 void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
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120 sys::SmartScopedWriter<true> Guard(Lock);
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121 Listeners.push_back(L);
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122 }
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123
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124 void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
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125 sys::SmartScopedWriter<true> Guard(Lock);
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126
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127 auto I = llvm::find(Listeners, L);
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128 Listeners.erase(I);
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129 }