1 //===- Pass.cpp - LLVM Pass Infrastructure 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 LLVM Pass infrastructure. It is primarily
11 // responsible with ensuring that passes are executed and batched together
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Pass.h"
17 #include "llvm/PassManager.h"
18 #include "llvm/PassRegistry.h"
19 #include "llvm/Module.h"
20 #include "llvm/ADT/StringMap.h"
21 #include "llvm/Assembly/PrintModulePass.h"
22 #include "llvm/Support/Debug.h"
23 #include "llvm/Support/PassNameParser.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/System/Atomic.h"
26 #include "llvm/System/Mutex.h"
27 #include "llvm/System/Threading.h"
30 //===----------------------------------------------------------------------===//
31 // Pass Implementation
34 Pass::Pass(PassKind K, char &pid) : Resolver(0), PassID(&pid), Kind(K) { }
36 // Force out-of-line virtual method.
41 // Force out-of-line virtual method.
42 ModulePass::~ModulePass() { }
44 Pass *ModulePass::createPrinterPass(raw_ostream &O,
45 const std::string &Banner) const {
46 return createPrintModulePass(&O, false, Banner);
49 PassManagerType ModulePass::getPotentialPassManagerType() const {
50 return PMT_ModulePassManager;
53 bool Pass::mustPreserveAnalysisID(char &AID) const {
54 return Resolver->getAnalysisIfAvailable(&AID, true) != 0;
57 // dumpPassStructure - Implement the -debug-passes=Structure option
58 void Pass::dumpPassStructure(unsigned Offset) {
59 dbgs().indent(Offset*2) << getPassName() << "\n";
62 /// getPassName - Return a nice clean name for a pass. This usually
63 /// implemented in terms of the name that is registered by one of the
64 /// Registration templates, but can be overloaded directly.
66 const char *Pass::getPassName() const {
67 AnalysisID AID = getPassID();
68 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(AID);
70 return PI->getPassName();
71 return "Unnamed pass: implement Pass::getPassName()";
74 void Pass::preparePassManager(PMStack &) {
75 // By default, don't do anything.
78 PassManagerType Pass::getPotentialPassManagerType() const {
79 // Default implementation.
83 void Pass::getAnalysisUsage(AnalysisUsage &) const {
84 // By default, no analysis results are used, all are invalidated.
87 void Pass::releaseMemory() {
88 // By default, don't do anything.
91 void Pass::verifyAnalysis() const {
92 // By default, don't do anything.
95 void *Pass::getAdjustedAnalysisPointer(AnalysisID AID) {
99 ImmutablePass *Pass::getAsImmutablePass() {
103 PMDataManager *Pass::getAsPMDataManager() {
107 void Pass::setResolver(AnalysisResolver *AR) {
108 assert(!Resolver && "Resolver is already set");
112 // print - Print out the internal state of the pass. This is called by Analyze
113 // to print out the contents of an analysis. Otherwise it is not necessary to
114 // implement this method.
116 void Pass::print(raw_ostream &O,const Module*) const {
117 O << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
120 // dump - call print(cerr);
121 void Pass::dump() const {
125 //===----------------------------------------------------------------------===//
126 // ImmutablePass Implementation
128 // Force out-of-line virtual method.
129 ImmutablePass::~ImmutablePass() { }
131 void ImmutablePass::initializePass() {
132 // By default, don't do anything.
135 //===----------------------------------------------------------------------===//
136 // FunctionPass Implementation
139 Pass *FunctionPass::createPrinterPass(raw_ostream &O,
140 const std::string &Banner) const {
141 return createPrintFunctionPass(Banner, &O);
144 // run - On a module, we run this pass by initializing, runOnFunction'ing once
145 // for every function in the module, then by finalizing.
147 bool FunctionPass::runOnModule(Module &M) {
148 bool Changed = doInitialization(M);
150 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
151 if (!I->isDeclaration()) // Passes are not run on external functions!
152 Changed |= runOnFunction(*I);
154 return Changed | doFinalization(M);
157 // run - On a function, we simply initialize, run the function, then finalize.
159 bool FunctionPass::run(Function &F) {
160 // Passes are not run on external functions!
161 if (F.isDeclaration()) return false;
163 bool Changed = doInitialization(*F.getParent());
164 Changed |= runOnFunction(F);
165 return Changed | doFinalization(*F.getParent());
168 bool FunctionPass::doInitialization(Module &) {
169 // By default, don't do anything.
173 bool FunctionPass::doFinalization(Module &) {
174 // By default, don't do anything.
178 PassManagerType FunctionPass::getPotentialPassManagerType() const {
179 return PMT_FunctionPassManager;
182 //===----------------------------------------------------------------------===//
183 // BasicBlockPass Implementation
186 Pass *BasicBlockPass::createPrinterPass(raw_ostream &O,
187 const std::string &Banner) const {
189 llvm_unreachable("BasicBlockPass printing unsupported.");
193 // To run this pass on a function, we simply call runOnBasicBlock once for each
196 bool BasicBlockPass::runOnFunction(Function &F) {
197 bool Changed = doInitialization(F);
198 for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
199 Changed |= runOnBasicBlock(*I);
200 return Changed | doFinalization(F);
203 bool BasicBlockPass::doInitialization(Module &) {
204 // By default, don't do anything.
208 bool BasicBlockPass::doInitialization(Function &) {
209 // By default, don't do anything.
213 bool BasicBlockPass::doFinalization(Function &) {
214 // By default, don't do anything.
218 bool BasicBlockPass::doFinalization(Module &) {
219 // By default, don't do anything.
223 PassManagerType BasicBlockPass::getPotentialPassManagerType() const {
224 return PMT_BasicBlockPassManager;
227 const PassInfo *Pass::lookupPassInfo(const void *TI) {
228 return PassRegistry::getPassRegistry()->getPassInfo(TI);
231 const PassInfo *Pass::lookupPassInfo(StringRef Arg) {
232 return PassRegistry::getPassRegistry()->getPassInfo(Arg);
235 Pass *PassInfo::createPass() const {
236 assert((!isAnalysisGroup() || NormalCtor) &&
237 "No default implementation found for analysis group!");
239 "Cannot call createPass on PassInfo without default ctor!");
243 //===----------------------------------------------------------------------===//
244 // Analysis Group Implementation Code
245 //===----------------------------------------------------------------------===//
247 // RegisterAGBase implementation
249 RegisterAGBase::RegisterAGBase(const char *Name, const void *InterfaceID,
250 const void *PassID, bool isDefault)
251 : PassInfo(Name, InterfaceID) {
252 PassRegistry::getPassRegistry()->registerAnalysisGroup(InterfaceID, PassID,
257 //===----------------------------------------------------------------------===//
258 // PassRegistrationListener implementation
261 // PassRegistrationListener ctor - Add the current object to the list of
262 // PassRegistrationListeners...
263 PassRegistrationListener::PassRegistrationListener() {
264 PassRegistry::getPassRegistry()->addRegistrationListener(this);
267 // dtor - Remove object from list of listeners...
268 PassRegistrationListener::~PassRegistrationListener() {
269 PassRegistry::getPassRegistry()->removeRegistrationListener(this);
272 // enumeratePasses - Iterate over the registered passes, calling the
273 // passEnumerate callback on each PassInfo object.
275 void PassRegistrationListener::enumeratePasses() {
276 PassRegistry::getPassRegistry()->enumerateWith(this);
279 PassNameParser::~PassNameParser() {}
281 //===----------------------------------------------------------------------===//
282 // AnalysisUsage Class Implementation
286 struct GetCFGOnlyPasses : public PassRegistrationListener {
287 typedef AnalysisUsage::VectorType VectorType;
288 VectorType &CFGOnlyList;
289 GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}
291 void passEnumerate(const PassInfo *P) {
292 if (P->isCFGOnlyPass())
293 CFGOnlyList.push_back(P->getTypeInfo());
298 // setPreservesCFG - This function should be called to by the pass, iff they do
301 // 1. Add or remove basic blocks from the function
302 // 2. Modify terminator instructions in any way.
304 // This function annotates the AnalysisUsage info object to say that analyses
305 // that only depend on the CFG are preserved by this pass.
307 void AnalysisUsage::setPreservesCFG() {
308 // Since this transformation doesn't modify the CFG, it preserves all analyses
309 // that only depend on the CFG (like dominators, loop info, etc...)
310 GetCFGOnlyPasses(Preserved).enumeratePasses();
313 AnalysisUsage &AnalysisUsage::addPreserved(StringRef Arg) {
314 const PassInfo *PI = Pass::lookupPassInfo(Arg);
315 // If the pass exists, preserve it. Otherwise silently do nothing.
316 if (PI) Preserved.push_back(PI->getTypeInfo());
320 AnalysisUsage &AnalysisUsage::addRequiredID(const void *ID) {
321 Required.push_back(ID);
325 AnalysisUsage &AnalysisUsage::addRequiredID(char &ID) {
326 Required.push_back(&ID);
330 AnalysisUsage &AnalysisUsage::addRequiredTransitiveID(char &ID) {
331 Required.push_back(&ID);
332 RequiredTransitive.push_back(&ID);