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