lib/VMCore/PassRegistry.cpp

   1 //===- PassRegistry.cpp - Pass Registration Implementation ----------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the PassRegistry, with which passes are registered on
  11 // initialization, and supports the PassManager in dependency resolution.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/PassRegistry.h"
  16 #include "llvm/PassSupport.h"
  17 #include "llvm/Support/Compiler.h"
  18 #include "llvm/Support/ManagedStatic.h"
  19 #include "llvm/Support/Mutex.h"
  20 #include "llvm/ADT/DenseMap.h"
  21 #include "llvm/ADT/SmallPtrSet.h"
  22 #include "llvm/ADT/StringMap.h"
  23 #include <vector>
  24
  25 using namespace llvm;
  26
  27 // FIXME: We use ManagedStatic to erase the pass registrar on shutdown.
  28 // Unfortunately, passes are registered with static ctors, and having
  29 // llvm_shutdown clear this map prevents successful resurrection after
  30 // llvm_shutdown is run.  Ideally we should find a solution so that we don't
  31 // leak the map, AND can still resurrect after shutdown.
  32 static ManagedStatic<PassRegistry> PassRegistryObj;
  33 PassRegistry *PassRegistry::getPassRegistry() {
  34   return &*PassRegistryObj;
  35 }
  36
  37 static ManagedStatic<sys::SmartMutex<true> > Lock;
  38
  39 //===----------------------------------------------------------------------===//
  40 // PassRegistryImpl
  41 //
  42
  43 namespace {
  44 struct PassRegistryImpl {
  45   /// PassInfoMap - Keep track of the PassInfo object for each registered pass.
  46   typedef DenseMap<const void*, const PassInfo*> MapType;
  47   MapType PassInfoMap;
  48
  49   typedef StringMap<const PassInfo*> StringMapType;
  50   StringMapType PassInfoStringMap;
  51
  52   /// AnalysisGroupInfo - Keep track of information for each analysis group.
  53   struct AnalysisGroupInfo {
  54     SmallPtrSet<const PassInfo *, 8> Implementations;
  55   };
  56   DenseMap<const PassInfo*, AnalysisGroupInfo> AnalysisGroupInfoMap;
  57
  58   std::vector<const PassInfo*> ToFree;
  59   std::vector<PassRegistrationListener*> Listeners;
  60 };
  61 } // end anonymous namespace
  62
  63 void *PassRegistry::getImpl() const {
  64   if (!pImpl)
  65     pImpl = new PassRegistryImpl();
  66   return pImpl;
  67 }
  68
  69 //===----------------------------------------------------------------------===//
  70 // Accessors
  71 //
  72
  73 PassRegistry::~PassRegistry() {
  74   sys::SmartScopedLock<true> Guard(*Lock);
  75   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(pImpl);
  76
  77   for (std::vector<const PassInfo*>::iterator I = Impl->ToFree.begin(),
  78        E = Impl->ToFree.end(); I != E; ++I)
  79     delete *I;
  80
  81   delete Impl;
  82   pImpl = 0;
  83 }
  84
  85 const PassInfo *PassRegistry::getPassInfo(const void *TI) const {
  86   sys::SmartScopedLock<true> Guard(*Lock);
  87   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  88   PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.find(TI);
  89   return I != Impl->PassInfoMap.end() ? I->second : 0;
  90 }
  91
  92 const PassInfo *PassRegistry::getPassInfo(StringRef Arg) const {
  93   sys::SmartScopedLock<true> Guard(*Lock);
  94   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
  95   PassRegistryImpl::StringMapType::const_iterator
  96     I = Impl->PassInfoStringMap.find(Arg);
  97   return I != Impl->PassInfoStringMap.end() ? I->second : 0;
  98 }
  99
 100 //===----------------------------------------------------------------------===//
 101 // Pass Registration mechanism
 102 //
 103
 104 void PassRegistry::registerPass(const PassInfo &PI, bool ShouldFree) {
 105   sys::SmartScopedLock<true> Guard(*Lock);
 106   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 107   bool Inserted =
 108     Impl->PassInfoMap.insert(std::make_pair(PI.getTypeInfo(),&PI)).second;
 109   assert(Inserted && "Pass registered multiple times!");
 110   (void)Inserted;
 111   Impl->PassInfoStringMap[PI.getPassArgument()] = &PI;
 112
 113   // Notify any listeners.
 114   for (std::vector<PassRegistrationListener*>::iterator
 115        I = Impl->Listeners.begin(), E = Impl->Listeners.end(); I != E; ++I)
 116     (*I)->passRegistered(&PI);
 117
 118   if (ShouldFree) Impl->ToFree.push_back(&PI);
 119 }
 120
 121 void PassRegistry::unregisterPass(const PassInfo &PI) {
 122   sys::SmartScopedLock<true> Guard(*Lock);
 123   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 124   PassRegistryImpl::MapType::iterator I =
 125     Impl->PassInfoMap.find(PI.getTypeInfo());
 126   assert(I != Impl->PassInfoMap.end() && "Pass registered but not in map!");
 127
 128   // Remove pass from the map.
 129   Impl->PassInfoMap.erase(I);
 130   Impl->PassInfoStringMap.erase(PI.getPassArgument());
 131 }
 132
 133 void PassRegistry::enumerateWith(PassRegistrationListener *L) {
 134   sys::SmartScopedLock<true> Guard(*Lock);
 135   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 136   for (PassRegistryImpl::MapType::const_iterator I = Impl->PassInfoMap.begin(),
 137        E = Impl->PassInfoMap.end(); I != E; ++I)
 138     L->passEnumerate(I->second);
 139 }
 140
 141
 142 /// Analysis Group Mechanisms.
 143 void PassRegistry::registerAnalysisGroup(const void *InterfaceID,
 144                                          const void *PassID,
 145                                          PassInfo& Registeree,
 146                                          bool isDefault,
 147                                          bool ShouldFree) {
 148   PassInfo *InterfaceInfo =  const_cast<PassInfo*>(getPassInfo(InterfaceID));
 149   if (InterfaceInfo == 0) {
 150     // First reference to Interface, register it now.
 151     registerPass(Registeree);
 152     InterfaceInfo = &Registeree;
 153   }
 154   assert(Registeree.isAnalysisGroup() &&
 155          "Trying to join an analysis group that is a normal pass!");
 156
 157   if (PassID) {
 158     PassInfo *ImplementationInfo = const_cast<PassInfo*>(getPassInfo(PassID));
 159     assert(ImplementationInfo &&
 160            "Must register pass before adding to AnalysisGroup!");
 161
 162     sys::SmartScopedLock<true> Guard(*Lock);
 163
 164     // Make sure we keep track of the fact that the implementation implements
 165     // the interface.
 166     ImplementationInfo->addInterfaceImplemented(InterfaceInfo);
 167
 168     PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 169     PassRegistryImpl::AnalysisGroupInfo &AGI =
 170       Impl->AnalysisGroupInfoMap[InterfaceInfo];
 171     assert(AGI.Implementations.count(ImplementationInfo) == 0 &&
 172            "Cannot add a pass to the same analysis group more than once!");
 173     AGI.Implementations.insert(ImplementationInfo);
 174     if (isDefault) {
 175       assert(InterfaceInfo->getNormalCtor() == 0 &&
 176              "Default implementation for analysis group already specified!");
 177       assert(ImplementationInfo->getNormalCtor() &&
 178            "Cannot specify pass as default if it does not have a default ctor");
 179       InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
 180     }
 181   }
 182
 183   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 184   if (ShouldFree) Impl->ToFree.push_back(&Registeree);
 185 }
 186
 187 void PassRegistry::addRegistrationListener(PassRegistrationListener *L) {
 188   sys::SmartScopedLock<true> Guard(*Lock);
 189   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 190   Impl->Listeners.push_back(L);
 191 }
 192
 193 void PassRegistry::removeRegistrationListener(PassRegistrationListener *L) {
 194   sys::SmartScopedLock<true> Guard(*Lock);
 195
 196   // NOTE: This is necessary, because removeRegistrationListener() can be called
 197   // as part of the llvm_shutdown sequence.  Since we have no control over the
 198   // order of that sequence, we need to gracefully handle the case where the
 199   // PassRegistry is destructed before the object that triggers this call.
 200   if (!pImpl) return;
 201
 202   PassRegistryImpl *Impl = static_cast<PassRegistryImpl*>(getImpl());
 203   std::vector<PassRegistrationListener*>::iterator I =
 204     std::find(Impl->Listeners.begin(), Impl->Listeners.end(), L);
 205   assert(I != Impl->Listeners.end() &&
 206          "PassRegistrationListener not registered!");
 207   Impl->Listeners.erase(I);
 208 }