1 //===- Pass.cpp - LLVM Pass Infrastructure Impementation ------------------===//
3 // This file implements the LLVM Pass infrastructure. It is primarily
4 // responsible with ensuring that passes are executed and batched together
7 //===----------------------------------------------------------------------===//
9 #include "llvm/PassManager.h"
10 #include "PassManagerT.h" // PassManagerT implementation
11 #include "llvm/Module.h"
12 #include "Support/STLExtras.h"
13 #include "Support/TypeInfo.h"
15 #include <sys/resource.h>
17 #include <sys/unistd.h>
20 // IncludeFile - Stub function used to help linking out.
21 IncludeFile::IncludeFile(void*) {}
23 //===----------------------------------------------------------------------===//
24 // AnalysisID Class Implementation
27 static std::vector<const PassInfo*> CFGOnlyAnalyses;
29 void RegisterPassBase::setPreservesCFG() {
30 CFGOnlyAnalyses.push_back(PIObj);
33 //===----------------------------------------------------------------------===//
34 // AnalysisResolver Class Implementation
37 void AnalysisResolver::setAnalysisResolver(Pass *P, AnalysisResolver *AR) {
38 assert(P->Resolver == 0 && "Pass already in a PassManager!");
42 //===----------------------------------------------------------------------===//
43 // AnalysisUsage Class Implementation
46 // preservesCFG - This function should be called to by the pass, iff they do
49 // 1. Add or remove basic blocks from the function
50 // 2. Modify terminator instructions in any way.
52 // This function annotates the AnalysisUsage info object to say that analyses
53 // that only depend on the CFG are preserved by this pass.
55 void AnalysisUsage::preservesCFG() {
56 // Since this transformation doesn't modify the CFG, it preserves all analyses
57 // that only depend on the CFG (like dominators, loop info, etc...)
59 Preserved.insert(Preserved.end(),
60 CFGOnlyAnalyses.begin(), CFGOnlyAnalyses.end());
64 //===----------------------------------------------------------------------===//
65 // PassManager implementation - The PassManager class is a simple Pimpl class
66 // that wraps the PassManagerT template.
68 PassManager::PassManager() : PM(new PassManagerT<Module>()) {}
69 PassManager::~PassManager() { delete PM; }
70 void PassManager::add(Pass *P) { PM->add(P); }
71 bool PassManager::run(Module &M) { return PM->run(M); }
74 //===----------------------------------------------------------------------===//
75 // TimingInfo Class - This class is used to calculate information about the
76 // amount of time each pass takes to execute. This only happens with
77 // -time-passes is enabled on the command line.
80 EnableTiming("time-passes",
81 cl::desc("Time each pass, printing elapsed time for each on exit"));
83 static TimeRecord getTimeRecord() {
84 static unsigned long PageSize = 0;
88 PageSize = sysconf(_SC_PAGE_SIZE);
91 PageSize = sysconf(_SC_PAGESIZE);
93 PageSize = getpagesize();
101 if (getrusage(RUSAGE_SELF, &RU)) {
102 perror("getrusage call failed: -time-passes info incorrect!");
106 Result.Elapsed = T.tv_sec + T.tv_usec/1000000.0;
107 Result.UserTime = RU.ru_utime.tv_sec + RU.ru_utime.tv_usec/1000000.0;
108 Result.SystemTime = RU.ru_stime.tv_sec + RU.ru_stime.tv_usec/1000000.0;
109 Result.MaxRSS = RU.ru_maxrss*PageSize;
114 bool TimeRecord::operator<(const TimeRecord &TR) const {
115 // Primary sort key is User+System time
116 if (UserTime+SystemTime < TR.UserTime+TR.SystemTime)
118 if (UserTime+SystemTime > TR.UserTime+TR.SystemTime)
121 // Secondary sort key is Wall Time
122 return Elapsed < TR.Elapsed;
125 void TimeRecord::passStart(const TimeRecord &T) {
126 Elapsed -= T.Elapsed;
127 UserTime -= T.UserTime;
128 SystemTime -= T.SystemTime;
132 void TimeRecord::passEnd(const TimeRecord &T) {
133 Elapsed += T.Elapsed;
134 UserTime += T.UserTime;
135 SystemTime += T.SystemTime;
136 RSSTemp = T.MaxRSS - RSSTemp;
137 MaxRSS = std::max(MaxRSS, RSSTemp);
140 static void printVal(double Val, double Total) {
141 if (Total < 1e-7) // Avoid dividing by zero...
142 fprintf(stderr, " ----- ");
144 fprintf(stderr, " %7.4f (%5.1f%%)", Val, Val*100/Total);
147 void TimeRecord::print(const char *PassName, const TimeRecord &Total) const {
148 printVal(UserTime, Total.UserTime);
149 printVal(SystemTime, Total.SystemTime);
150 printVal(UserTime+SystemTime, Total.UserTime+Total.SystemTime);
151 printVal(Elapsed, Total.Elapsed);
153 fprintf(stderr, " ");
156 std::cerr << MaxRSS << "\t";
157 std::cerr << PassName << "\n";
161 // Create method. If Timing is enabled, this creates and returns a new timing
162 // object, otherwise it returns null.
164 TimingInfo *TimingInfo::create() {
165 return EnableTiming ? new TimingInfo() : 0;
168 void TimingInfo::passStarted(Pass *P) {
169 TimingData[P].passStart(getTimeRecord());
171 void TimingInfo::passEnded(Pass *P) {
172 TimingData[P].passEnd(getTimeRecord());
174 void TimeRecord::sum(const TimeRecord &TR) {
175 Elapsed += TR.Elapsed;
176 UserTime += TR.UserTime;
177 SystemTime += TR.SystemTime;
181 // TimingDtor - Print out information about timing information
182 TimingInfo::~TimingInfo() {
183 // Iterate over all of the data, converting it into the dual of the data map,
184 // so that the data is sorted by amount of time taken, instead of pointer.
186 std::vector<std::pair<TimeRecord, Pass*> > Data;
188 for (std::map<Pass*, TimeRecord>::iterator I = TimingData.begin(),
189 E = TimingData.end(); I != E; ++I)
190 // Throw out results for "grouping" pass managers...
191 if (!dynamic_cast<AnalysisResolver*>(I->first)) {
192 Data.push_back(std::make_pair(I->second, I->first));
193 Total.sum(I->second);
196 // Sort the data by time as the primary key, in reverse order...
197 std::sort(Data.begin(), Data.end(),
198 std::greater<std::pair<TimeRecord, Pass*> >());
200 // Print out timing header...
201 std::cerr << std::string(79, '=') << "\n"
202 << " ... Pass execution timing report ...\n"
203 << std::string(79, '=') << "\n Total Execution Time: "
204 << (Total.UserTime+Total.SystemTime) << " seconds ("
205 << Total.Elapsed << " wall clock)\n\n ---User Time--- "
206 << "--System Time-- --User+System-- ---Wall Time---";
209 std::cerr << " ---Mem---";
210 std::cerr << " --- Pass Name ---\n";
212 // Loop through all of the timing data, printing it out...
213 for (unsigned i = 0, e = Data.size(); i != e; ++i)
214 Data[i].first.print(Data[i].second->getPassName(), Total);
216 Total.print("TOTAL", Total);
220 void PMDebug::PrintArgumentInformation(const Pass *P) {
221 // Print out passes in pass manager...
222 if (const AnalysisResolver *PM = dynamic_cast<const AnalysisResolver*>(P)) {
223 for (unsigned i = 0, e = PM->getNumContainedPasses(); i != e; ++i)
224 PrintArgumentInformation(PM->getContainedPass(i));
226 } else { // Normal pass. Print argument information...
227 // Print out arguments for registered passes that are _optimizations_
228 if (const PassInfo *PI = P->getPassInfo())
229 if (PI->getPassType() & PassInfo::Optimization)
230 std::cerr << " -" << PI->getPassArgument();
234 void PMDebug::PrintPassInformation(unsigned Depth, const char *Action,
235 Pass *P, Annotable *V) {
236 if (PassDebugging >= Executions) {
237 std::cerr << (void*)P << std::string(Depth*2+1, ' ') << Action << " '"
240 std::cerr << "' on ";
242 if (dynamic_cast<Module*>(V)) {
243 std::cerr << "Module\n"; return;
244 } else if (Function *F = dynamic_cast<Function*>(V))
245 std::cerr << "Function '" << F->getName();
246 else if (BasicBlock *BB = dynamic_cast<BasicBlock*>(V))
247 std::cerr << "BasicBlock '" << BB->getName();
248 else if (Value *Val = dynamic_cast<Value*>(V))
249 std::cerr << typeid(*Val).name() << " '" << Val->getName();
251 std::cerr << "'...\n";
255 void PMDebug::PrintAnalysisSetInfo(unsigned Depth, const char *Msg,
256 Pass *P, const std::vector<AnalysisID> &Set){
257 if (PassDebugging >= Details && !Set.empty()) {
258 std::cerr << (void*)P << std::string(Depth*2+3, ' ') << Msg << " Analyses:";
259 for (unsigned i = 0; i != Set.size(); ++i) {
260 if (i) std::cerr << ",";
261 std::cerr << " " << Set[i]->getPassName();
267 //===----------------------------------------------------------------------===//
268 // Pass Implementation
271 void Pass::addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU) {
272 PM->addPass(this, AU);
275 // dumpPassStructure - Implement the -debug-passes=Structure option
276 void Pass::dumpPassStructure(unsigned Offset) {
277 std::cerr << std::string(Offset*2, ' ') << getPassName() << "\n";
280 // getPassName - Use C++ RTTI to get a SOMEWHAT intelligable name for the pass.
282 const char *Pass::getPassName() const {
283 if (const PassInfo *PI = getPassInfo())
284 return PI->getPassName();
285 return typeid(*this).name();
288 // print - Print out the internal state of the pass. This is called by Analyse
289 // to print out the contents of an analysis. Otherwise it is not neccesary to
290 // implement this method.
292 void Pass::print(std::ostream &O) const {
293 O << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
296 // dump - call print(std::cerr);
297 void Pass::dump() const {
301 //===----------------------------------------------------------------------===//
302 // ImmutablePass Implementation
304 void ImmutablePass::addToPassManager(PassManagerT<Module> *PM,
306 PM->addPass(this, AU);
310 //===----------------------------------------------------------------------===//
311 // FunctionPass Implementation
314 // run - On a module, we run this pass by initializing, runOnFunction'ing once
315 // for every function in the module, then by finalizing.
317 bool FunctionPass::run(Module &M) {
318 bool Changed = doInitialization(M);
320 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
321 if (!I->isExternal()) // Passes are not run on external functions!
322 Changed |= runOnFunction(*I);
324 return Changed | doFinalization(M);
327 // run - On a function, we simply initialize, run the function, then finalize.
329 bool FunctionPass::run(Function &F) {
330 if (F.isExternal()) return false;// Passes are not run on external functions!
332 return doInitialization(*F.getParent()) | runOnFunction(F)
333 | doFinalization(*F.getParent());
336 void FunctionPass::addToPassManager(PassManagerT<Module> *PM,
338 PM->addPass(this, AU);
341 void FunctionPass::addToPassManager(PassManagerT<Function> *PM,
343 PM->addPass(this, AU);
346 //===----------------------------------------------------------------------===//
347 // BasicBlockPass Implementation
350 // To run this pass on a function, we simply call runOnBasicBlock once for each
353 bool BasicBlockPass::runOnFunction(Function &F) {
354 bool Changed = doInitialization(F);
355 for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
356 Changed |= runOnBasicBlock(*I);
357 return Changed | doFinalization(F);
360 // To run directly on the basic block, we initialize, runOnBasicBlock, then
363 bool BasicBlockPass::run(BasicBlock &BB) {
364 Function &F = *BB.getParent();
365 Module &M = *F.getParent();
366 return doInitialization(M) | doInitialization(F) | runOnBasicBlock(BB) |
367 doFinalization(F) | doFinalization(M);
370 void BasicBlockPass::addToPassManager(PassManagerT<Function> *PM,
372 PM->addPass(this, AU);
375 void BasicBlockPass::addToPassManager(PassManagerT<BasicBlock> *PM,
377 PM->addPass(this, AU);
381 //===----------------------------------------------------------------------===//
382 // Pass Registration mechanism
384 static std::map<TypeInfo, PassInfo*> *PassInfoMap = 0;
385 static std::vector<PassRegistrationListener*> *Listeners = 0;
387 // getPassInfo - Return the PassInfo data structure that corresponds to this
389 const PassInfo *Pass::getPassInfo() const {
390 if (PassInfoCache) return PassInfoCache;
391 return lookupPassInfo(typeid(*this));
394 const PassInfo *Pass::lookupPassInfo(const std::type_info &TI) {
395 if (PassInfoMap == 0) return 0;
396 std::map<TypeInfo, PassInfo*>::iterator I = PassInfoMap->find(TI);
397 return (I != PassInfoMap->end()) ? I->second : 0;
400 void RegisterPassBase::registerPass(PassInfo *PI) {
401 if (PassInfoMap == 0)
402 PassInfoMap = new std::map<TypeInfo, PassInfo*>();
404 assert(PassInfoMap->find(PI->getTypeInfo()) == PassInfoMap->end() &&
405 "Pass already registered!");
407 PassInfoMap->insert(std::make_pair(TypeInfo(PI->getTypeInfo()), PI));
409 // Notify any listeners...
411 for (std::vector<PassRegistrationListener*>::iterator
412 I = Listeners->begin(), E = Listeners->end(); I != E; ++I)
413 (*I)->passRegistered(PI);
416 void RegisterPassBase::unregisterPass(PassInfo *PI) {
417 assert(PassInfoMap && "Pass registered but not in map!");
418 std::map<TypeInfo, PassInfo*>::iterator I =
419 PassInfoMap->find(PI->getTypeInfo());
420 assert(I != PassInfoMap->end() && "Pass registered but not in map!");
422 // Remove pass from the map...
423 PassInfoMap->erase(I);
424 if (PassInfoMap->empty()) {
429 // Notify any listeners...
431 for (std::vector<PassRegistrationListener*>::iterator
432 I = Listeners->begin(), E = Listeners->end(); I != E; ++I)
433 (*I)->passUnregistered(PI);
435 // Delete the PassInfo object itself...
439 //===----------------------------------------------------------------------===//
440 // Analysis Group Implementation Code
441 //===----------------------------------------------------------------------===//
443 struct AnalysisGroupInfo {
444 const PassInfo *DefaultImpl;
445 std::set<const PassInfo *> Implementations;
446 AnalysisGroupInfo() : DefaultImpl(0) {}
449 static std::map<const PassInfo *, AnalysisGroupInfo> *AnalysisGroupInfoMap = 0;
451 // RegisterAGBase implementation
453 RegisterAGBase::RegisterAGBase(const std::type_info &Interface,
454 const std::type_info *Pass, bool isDefault)
455 : ImplementationInfo(0), isDefaultImplementation(isDefault) {
457 InterfaceInfo = const_cast<PassInfo*>(Pass::lookupPassInfo(Interface));
458 if (InterfaceInfo == 0) { // First reference to Interface, add it now.
459 InterfaceInfo = // Create the new PassInfo for the interface...
460 new PassInfo("", "", Interface, PassInfo::AnalysisGroup, 0, 0);
461 registerPass(InterfaceInfo);
464 assert(InterfaceInfo->getPassType() == PassInfo::AnalysisGroup &&
465 "Trying to join an analysis group that is a normal pass!");
468 ImplementationInfo = Pass::lookupPassInfo(*Pass);
469 assert(ImplementationInfo &&
470 "Must register pass before adding to AnalysisGroup!");
472 // Make sure we keep track of the fact that the implementation implements
474 PassInfo *IIPI = const_cast<PassInfo*>(ImplementationInfo);
475 IIPI->addInterfaceImplemented(InterfaceInfo);
477 // Lazily allocate to avoid nasty initialization order dependencies
478 if (AnalysisGroupInfoMap == 0)
479 AnalysisGroupInfoMap = new std::map<const PassInfo *,AnalysisGroupInfo>();
481 AnalysisGroupInfo &AGI = (*AnalysisGroupInfoMap)[InterfaceInfo];
482 assert(AGI.Implementations.count(ImplementationInfo) == 0 &&
483 "Cannot add a pass to the same analysis group more than once!");
484 AGI.Implementations.insert(ImplementationInfo);
486 assert(AGI.DefaultImpl == 0 && InterfaceInfo->getNormalCtor() == 0 &&
487 "Default implementation for analysis group already specified!");
488 assert(ImplementationInfo->getNormalCtor() &&
489 "Cannot specify pass as default if it does not have a default ctor");
490 AGI.DefaultImpl = ImplementationInfo;
491 InterfaceInfo->setNormalCtor(ImplementationInfo->getNormalCtor());
496 void RegisterAGBase::setGroupName(const char *Name) {
497 assert(InterfaceInfo->getPassName()[0] == 0 && "Interface Name already set!");
498 InterfaceInfo->setPassName(Name);
501 RegisterAGBase::~RegisterAGBase() {
502 if (ImplementationInfo) {
503 assert(AnalysisGroupInfoMap && "Inserted into map, but map doesn't exist?");
504 AnalysisGroupInfo &AGI = (*AnalysisGroupInfoMap)[InterfaceInfo];
506 assert(AGI.Implementations.count(ImplementationInfo) &&
507 "Pass not a member of analysis group?");
509 if (AGI.DefaultImpl == ImplementationInfo)
512 AGI.Implementations.erase(ImplementationInfo);
514 // Last member of this analysis group? Unregister PassInfo, delete map entry
515 if (AGI.Implementations.empty()) {
516 assert(AGI.DefaultImpl == 0 &&
517 "Default implementation didn't unregister?");
518 AnalysisGroupInfoMap->erase(InterfaceInfo);
519 if (AnalysisGroupInfoMap->empty()) { // Delete map if empty
520 delete AnalysisGroupInfoMap;
521 AnalysisGroupInfoMap = 0;
524 unregisterPass(InterfaceInfo);
530 //===----------------------------------------------------------------------===//
531 // PassRegistrationListener implementation
534 // PassRegistrationListener ctor - Add the current object to the list of
535 // PassRegistrationListeners...
536 PassRegistrationListener::PassRegistrationListener() {
537 if (!Listeners) Listeners = new std::vector<PassRegistrationListener*>();
538 Listeners->push_back(this);
541 // dtor - Remove object from list of listeners...
542 PassRegistrationListener::~PassRegistrationListener() {
543 std::vector<PassRegistrationListener*>::iterator I =
544 std::find(Listeners->begin(), Listeners->end(), this);
545 assert(Listeners && I != Listeners->end() &&
546 "PassRegistrationListener not registered!");
549 if (Listeners->empty()) {
555 // enumeratePasses - Iterate over the registered passes, calling the
556 // passEnumerate callback on each PassInfo object.
558 void PassRegistrationListener::enumeratePasses() {
560 for (std::map<TypeInfo, PassInfo*>::iterator I = PassInfoMap->begin(),
561 E = PassInfoMap->end(); I != E; ++I)
562 passEnumerate(I->second);