1 //===- Pass.cpp - LLVM Pass Infrastructure Implementation -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the LLVM Pass infrastructure. It is primarily
11 // responsible with ensuring that passes are executed and batched together
14 //===----------------------------------------------------------------------===//
16 #include "llvm/PassManager.h"
17 #include "llvm/Module.h"
18 #include "llvm/ModuleProvider.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/Support/ManagedStatic.h"
21 #include "llvm/Support/TypeInfo.h"
26 //===----------------------------------------------------------------------===//
27 // Pass Implementation
30 // Force out-of-line virtual method.
35 // Force out-of-line virtual method.
36 ModulePass::~ModulePass() { }
38 bool Pass::mustPreserveAnalysisID(const PassInfo *AnalysisID) const {
39 return Resolver->getAnalysisToUpdate(AnalysisID, true) != 0;
42 // dumpPassStructure - Implement the -debug-passes=Structure option
43 void Pass::dumpPassStructure(unsigned Offset) {
44 cerr << std::string(Offset*2, ' ') << getPassName() << "\n";
47 // getPassName - Use C++ RTTI to get a SOMEWHAT intelligible name for the pass.
49 const char *Pass::getPassName() const {
50 if (const PassInfo *PI = getPassInfo())
51 return PI->getPassName();
52 return typeid(*this).name();
55 // print - Print out the internal state of the pass. This is called by Analyze
56 // to print out the contents of an analysis. Otherwise it is not necessary to
57 // implement this method.
59 void Pass::print(std::ostream &O,const Module*) const {
60 O << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
63 // dump - call print(cerr);
64 void Pass::dump() const {
65 print(*cerr.stream(), 0);
68 //===----------------------------------------------------------------------===//
69 // ImmutablePass Implementation
71 // Force out-of-line virtual method.
72 ImmutablePass::~ImmutablePass() { }
74 //===----------------------------------------------------------------------===//
75 // FunctionPass Implementation
78 // run - On a module, we run this pass by initializing, runOnFunction'ing once
79 // for every function in the module, then by finalizing.
81 bool FunctionPass::runOnModule(Module &M) {
82 bool Changed = doInitialization(M);
84 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
85 if (!I->isDeclaration()) // Passes are not run on external functions!
86 Changed |= runOnFunction(*I);
88 return Changed | doFinalization(M);
91 // run - On a function, we simply initialize, run the function, then finalize.
93 bool FunctionPass::run(Function &F) {
94 if (F.isDeclaration()) return false;// Passes are not run on external functions!
96 bool Changed = doInitialization(*F.getParent());
97 Changed |= runOnFunction(F);
98 return Changed | doFinalization(*F.getParent());
101 //===----------------------------------------------------------------------===//
102 // BasicBlockPass Implementation
105 // To run this pass on a function, we simply call runOnBasicBlock once for each
108 bool BasicBlockPass::runOnFunction(Function &F) {
109 bool Changed = doInitialization(F);
110 for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
111 Changed |= runOnBasicBlock(*I);
112 return Changed | doFinalization(F);
115 // To run directly on the basic block, we initialize, runOnBasicBlock, then
118 bool BasicBlockPass::runPass(BasicBlock &BB) {
119 Function &F = *BB.getParent();
120 Module &M = *F.getParent();
121 bool Changed = doInitialization(M);
122 Changed |= doInitialization(F);
123 Changed |= runOnBasicBlock(BB);
124 Changed |= doFinalization(F);
125 Changed |= doFinalization(M);
129 //===----------------------------------------------------------------------===//
130 // Pass Registration mechanism
133 class PassRegistrar {
134 /// PassInfoMap - Keep track of the passinfo object for each registered llvm
136 std::map<TypeInfo, PassInfo*> PassInfoMap;
138 /// AnalysisGroupInfo - Keep track of information for each analysis group.
139 struct AnalysisGroupInfo {
140 const PassInfo *DefaultImpl;
141 std::set<const PassInfo *> Implementations;
142 AnalysisGroupInfo() : DefaultImpl(0) {}
145 /// AnalysisGroupInfoMap - Information for each analysis group.
146 std::map<const PassInfo *, AnalysisGroupInfo> AnalysisGroupInfoMap;
150 const PassInfo *GetPassInfo(const std::type_info &TI) const {
151 std::map<TypeInfo, PassInfo*>::const_iterator I = PassInfoMap.find(TI);
152 return I != PassInfoMap.end() ? I->second : 0;
155 void RegisterPass(PassInfo &PI) {
157 PassInfoMap.insert(std::make_pair(TypeInfo(PI.getTypeInfo()),&PI)).second;
158 assert(Inserted && "Pass registered multiple times!");
161 void UnregisterPass(PassInfo &PI) {
162 std::map<TypeInfo, PassInfo*>::iterator I =
163 PassInfoMap.find(PI.getTypeInfo());
164 assert(I != PassInfoMap.end() && "Pass registered but not in map!");
166 // Remove pass from the map.
167 PassInfoMap.erase(I);
170 void EnumerateWith(PassRegistrationListener *L) {
171 for (std::map<TypeInfo, PassInfo*>::const_iterator I = PassInfoMap.begin(),
172 E = PassInfoMap.end(); I != E; ++I)
173 L->passEnumerate(I->second);
177 /// Analysis Group Mechanisms.
178 void RegisterAnalysisGroup(PassInfo *InterfaceInfo,
179 const PassInfo *ImplementationInfo,
181 AnalysisGroupInfo &AGI = AnalysisGroupInfoMap[InterfaceInfo];
182 assert(AGI.Implementations.count(ImplementationInfo) == 0 &&
183 "Cannot add a pass to the same analysis group more than once!");
184 AGI.Implementations.insert(ImplementationInfo);
186 assert(AGI.DefaultImpl == 0 && InterfaceInfo->getNormalCtor() == 0 &&
187 "Default implementation for analysis group already specified!");
188 assert(ImplementationInfo->getNormalCtor() &&
189 "Cannot specify pass as default if it does not have a default ctor");
190 AGI.DefaultImpl = ImplementationInfo;
191 InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
197 static std::vector<PassRegistrationListener*> *Listeners = 0;
199 // FIXME: This should use ManagedStatic to manage the pass registrar.
200 // Unfortunately, we can't do this, because passes are registered with static
201 // ctors, and having llvm_shutdown clear this map prevents successful
202 // ressurection after llvm_shutdown is run.
203 static PassRegistrar *getPassRegistrar() {
204 static PassRegistrar *PassRegistrarObj = 0;
205 if (!PassRegistrarObj)
206 PassRegistrarObj = new PassRegistrar();
207 return PassRegistrarObj;
210 // getPassInfo - Return the PassInfo data structure that corresponds to this
212 const PassInfo *Pass::getPassInfo() const {
213 if (PassInfoCache) return PassInfoCache;
214 return lookupPassInfo(typeid(*this));
217 const PassInfo *Pass::lookupPassInfo(const std::type_info &TI) {
218 return getPassRegistrar()->GetPassInfo(TI);
221 void RegisterPassBase::registerPass() {
222 getPassRegistrar()->RegisterPass(PIObj);
224 // Notify any listeners.
226 for (std::vector<PassRegistrationListener*>::iterator
227 I = Listeners->begin(), E = Listeners->end(); I != E; ++I)
228 (*I)->passRegistered(&PIObj);
231 void RegisterPassBase::unregisterPass() {
232 getPassRegistrar()->UnregisterPass(PIObj);
235 //===----------------------------------------------------------------------===//
236 // Analysis Group Implementation Code
237 //===----------------------------------------------------------------------===//
239 // RegisterAGBase implementation
241 RegisterAGBase::RegisterAGBase(const std::type_info &Interface,
242 const std::type_info *Pass, bool isDefault)
243 : RegisterPassBase(Interface),
244 ImplementationInfo(0), isDefaultImplementation(isDefault) {
246 InterfaceInfo = const_cast<PassInfo*>(Pass::lookupPassInfo(Interface));
247 if (InterfaceInfo == 0) {
248 // First reference to Interface, register it now.
250 InterfaceInfo = &PIObj;
252 assert(PIObj.isAnalysisGroup() &&
253 "Trying to join an analysis group that is a normal pass!");
256 ImplementationInfo = Pass::lookupPassInfo(*Pass);
257 assert(ImplementationInfo &&
258 "Must register pass before adding to AnalysisGroup!");
260 // Make sure we keep track of the fact that the implementation implements
262 PassInfo *IIPI = const_cast<PassInfo*>(ImplementationInfo);
263 IIPI->addInterfaceImplemented(InterfaceInfo);
265 getPassRegistrar()->RegisterAnalysisGroup(InterfaceInfo, IIPI, isDefault);
269 void RegisterAGBase::setGroupName(const char *Name) {
270 assert(InterfaceInfo->getPassName()[0] == 0 && "Interface Name already set!");
271 InterfaceInfo->setPassName(Name);
275 //===----------------------------------------------------------------------===//
276 // PassRegistrationListener implementation
279 // PassRegistrationListener ctor - Add the current object to the list of
280 // PassRegistrationListeners...
281 PassRegistrationListener::PassRegistrationListener() {
282 if (!Listeners) Listeners = new std::vector<PassRegistrationListener*>();
283 Listeners->push_back(this);
286 // dtor - Remove object from list of listeners...
287 PassRegistrationListener::~PassRegistrationListener() {
288 std::vector<PassRegistrationListener*>::iterator I =
289 std::find(Listeners->begin(), Listeners->end(), this);
290 assert(Listeners && I != Listeners->end() &&
291 "PassRegistrationListener not registered!");
294 if (Listeners->empty()) {
300 // enumeratePasses - Iterate over the registered passes, calling the
301 // passEnumerate callback on each PassInfo object.
303 void PassRegistrationListener::enumeratePasses() {
304 getPassRegistrar()->EnumerateWith(this);
307 //===----------------------------------------------------------------------===//
308 // AnalysisUsage Class Implementation
312 struct GetCFGOnlyPasses : public PassRegistrationListener {
313 std::vector<AnalysisID> &CFGOnlyList;
314 GetCFGOnlyPasses(std::vector<AnalysisID> &L) : CFGOnlyList(L) {}
316 void passEnumerate(const PassInfo *P) {
317 if (P->isCFGOnlyPass())
318 CFGOnlyList.push_back(P);
323 // setPreservesCFG - This function should be called to by the pass, iff they do
326 // 1. Add or remove basic blocks from the function
327 // 2. Modify terminator instructions in any way.
329 // This function annotates the AnalysisUsage info object to say that analyses
330 // that only depend on the CFG are preserved by this pass.
332 void AnalysisUsage::setPreservesCFG() {
333 // Since this transformation doesn't modify the CFG, it preserves all analyses
334 // that only depend on the CFG (like dominators, loop info, etc...)
335 GetCFGOnlyPasses(Preserved).enumeratePasses();