25 #include "llvm/ADT/FoldingSet.h" 26 #include "llvm/ADT/STLExtras.h" 27 #include "llvm/Support/Casting.h" 28 #include "llvm/Support/Compiler.h" 29 #include "llvm/Support/ErrorHandling.h" 30 #include "llvm/Support/raw_ostream.h" 33 using namespace clang;
36 void SymExpr::anchor() {}
44 getLHS()->dumpToStream(os);
47 if (getRHS().isUnsigned())
48 os << getRHS().getZExtValue();
50 os << getRHS().getSExtValue();
51 if (getRHS().isUnsigned())
56 if (getLHS().isUnsigned())
57 os << getLHS().getZExtValue();
59 os << getLHS().getSExtValue();
60 if (getLHS().isUnsigned())
65 getRHS()->dumpToStream(os);
71 getLHS()->dumpToStream(os);
75 getRHS()->dumpToStream(os);
80 os <<
'(' << ToTy.getAsString() <<
") (";
81 Operand->dumpToStream(os);
86 os <<
"conj_$" << getSymbolID() <<
'{' << T.getAsString() <<
'}';
90 os <<
"derived_$" << getSymbolID() <<
'{' 91 << getParentSymbol() <<
',' << getRegion() <<
'}';
95 os <<
"extent_$" << getSymbolID() <<
'{' << getRegion() <<
'}';
99 os <<
"meta_$" << getSymbolID() <<
'{' 100 << getRegion() <<
',' << T.getAsString() <<
'}';
103 void SymbolData::anchor() {}
106 os <<
"reg_$" << getSymbolID()
110 bool SymExpr::symbol_iterator::operator==(const symbol_iterator &X) const { 114 bool SymExpr::symbol_iterator::operator!=(const symbol_iterator &X) const { 118 SymExpr::symbol_iterator::symbol_iterator(const SymExpr *SE) { 122 SymExpr::symbol_iterator &SymExpr::symbol_iterator::operator++() { 123 assert(!itr.empty() && "attempting to iterate on an 'end
' iterator"); 128 SymbolRef SymExpr::symbol_iterator::operator*() { 129 assert(!itr.empty() && "attempting to dereference an 'end
' iterator"); 133 void SymExpr::symbol_iterator::expand() { 134 const SymExpr *SE = itr.pop_back_val(); 136 switch (SE->getKind()) { 137 case SymExpr::SymbolRegionValueKind: 138 case SymExpr::SymbolConjuredKind: 139 case SymExpr::SymbolDerivedKind: 140 case SymExpr::SymbolExtentKind: 141 case SymExpr::SymbolMetadataKind: 143 case SymExpr::SymbolCastKind: 144 itr.push_back(cast<SymbolCast>(SE)->getOperand()); 146 case SymExpr::SymIntExprKind: 147 itr.push_back(cast<SymIntExpr>(SE)->getLHS()); 149 case SymExpr::IntSymExprKind: 150 itr.push_back(cast<IntSymExpr>(SE)->getRHS()); 152 case SymExpr::SymSymExprKind: { 153 const auto *x = cast<SymSymExpr>(SE); 154 itr.push_back(x->getLHS()); 155 itr.push_back(x->getRHS()); 159 llvm_unreachable("unhandled expansion case"); 162 const SymbolRegionValue* 163 SymbolManager::getRegionValueSymbol(const TypedValueRegion* R) { 164 llvm::FoldingSetNodeID profile; 165 SymbolRegionValue::Profile(profile, R); 167 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 169 SD = (SymExpr*) BPAlloc.Allocate<SymbolRegionValue>(); 170 new (SD) SymbolRegionValue(SymbolCounter, R); 171 DataSet.InsertNode(SD, InsertPos); 175 return cast<SymbolRegionValue>(SD); 178 const SymbolConjured* SymbolManager::conjureSymbol(const Stmt *E, 179 const LocationContext *LCtx, 182 const void *SymbolTag) { 183 llvm::FoldingSetNodeID profile; 184 SymbolConjured::Profile(profile, E, T, Count, LCtx, SymbolTag); 186 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 188 SD = (SymExpr*) BPAlloc.Allocate<SymbolConjured>(); 189 new (SD) SymbolConjured(SymbolCounter, E, LCtx, T, Count, SymbolTag); 190 DataSet.InsertNode(SD, InsertPos); 194 return cast<SymbolConjured>(SD); 198 SymbolManager::getDerivedSymbol(SymbolRef parentSymbol, 199 const TypedValueRegion *R) { 200 llvm::FoldingSetNodeID profile; 201 SymbolDerived::Profile(profile, parentSymbol, R); 203 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 205 SD = (SymExpr*) BPAlloc.Allocate<SymbolDerived>(); 206 new (SD) SymbolDerived(SymbolCounter, parentSymbol, R); 207 DataSet.InsertNode(SD, InsertPos); 211 return cast<SymbolDerived>(SD); 215 SymbolManager::getExtentSymbol(const SubRegion *R) { 216 llvm::FoldingSetNodeID profile; 217 SymbolExtent::Profile(profile, R); 219 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 221 SD = (SymExpr*) BPAlloc.Allocate<SymbolExtent>(); 222 new (SD) SymbolExtent(SymbolCounter, R); 223 DataSet.InsertNode(SD, InsertPos); 227 return cast<SymbolExtent>(SD); 230 const SymbolMetadata * 231 SymbolManager::getMetadataSymbol(const MemRegion* R, const Stmt *S, QualType T, 232 const LocationContext *LCtx, 233 unsigned Count, const void *SymbolTag) { 234 llvm::FoldingSetNodeID profile; 235 SymbolMetadata::Profile(profile, R, S, T, LCtx, Count, SymbolTag); 237 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 239 SD = (SymExpr*) BPAlloc.Allocate<SymbolMetadata>(); 240 new (SD) SymbolMetadata(SymbolCounter, R, S, T, LCtx, Count, SymbolTag); 241 DataSet.InsertNode(SD, InsertPos); 245 return cast<SymbolMetadata>(SD); 249 SymbolManager::getCastSymbol(const SymExpr *Op, 250 QualType From, QualType To) { 251 llvm::FoldingSetNodeID ID; 252 SymbolCast::Profile(ID, Op, From, To); 254 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 256 data = (SymbolCast*) BPAlloc.Allocate<SymbolCast>(); 257 new (data) SymbolCast(Op, From, To); 258 DataSet.InsertNode(data, InsertPos); 261 return cast<SymbolCast>(data); 264 const SymIntExpr *SymbolManager::getSymIntExpr(const SymExpr *lhs, 265 BinaryOperator::Opcode op, 266 const llvm::APSInt& v, 268 llvm::FoldingSetNodeID ID; 269 SymIntExpr::Profile(ID, lhs, op, v, t); 271 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 274 data = (SymIntExpr*) BPAlloc.Allocate<SymIntExpr>(); 275 new (data) SymIntExpr(lhs, op, v, t); 276 DataSet.InsertNode(data, InsertPos); 279 return cast<SymIntExpr>(data); 282 const IntSymExpr *SymbolManager::getIntSymExpr(const llvm::APSInt& lhs, 283 BinaryOperator::Opcode op, 286 llvm::FoldingSetNodeID ID; 287 IntSymExpr::Profile(ID, lhs, op, rhs, t); 289 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 292 data = (IntSymExpr*) BPAlloc.Allocate<IntSymExpr>(); 293 new (data) IntSymExpr(lhs, op, rhs, t); 294 DataSet.InsertNode(data, InsertPos); 297 return cast<IntSymExpr>(data); 300 const SymSymExpr *SymbolManager::getSymSymExpr(const SymExpr *lhs, 301 BinaryOperator::Opcode op, 304 llvm::FoldingSetNodeID ID; 305 SymSymExpr::Profile(ID, lhs, op, rhs, t); 307 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 310 data = (SymSymExpr*) BPAlloc.Allocate<SymSymExpr>(); 311 new (data) SymSymExpr(lhs, op, rhs, t); 312 DataSet.InsertNode(data, InsertPos); 315 return cast<SymSymExpr>(data); 318 QualType SymbolConjured::getType() const { 322 QualType SymbolDerived::getType() const { 323 return R->getValueType(); 326 QualType SymbolExtent::getType() const { 327 ASTContext &Ctx = R->getMemRegionManager()->getContext(); 328 return Ctx.getSizeType(); 331 QualType SymbolMetadata::getType() const { 335 QualType SymbolRegionValue::getType() const { 336 return R->getValueType(); 339 SymbolManager::~SymbolManager() { 340 llvm::DeleteContainerSeconds(SymbolDependencies); 343 bool SymbolManager::canSymbolicate(QualType T) { 344 T = T.getCanonicalType(); 346 if (Loc::isLocType(T)) 349 if (T->isIntegralOrEnumerationType()) 352 if (T->isRecordType() && !T->isUnionType()) 358 void SymbolManager::addSymbolDependency(const SymbolRef Primary, 359 const SymbolRef Dependent) { 360 SymbolDependTy::iterator I = SymbolDependencies.find(Primary); 361 SymbolRefSmallVectorTy *dependencies = nullptr; 362 if (I == SymbolDependencies.end()) { 363 dependencies = new SymbolRefSmallVectorTy(); 364 SymbolDependencies[Primary] = dependencies; 366 dependencies = I->second; 368 dependencies->push_back(Dependent); 371 const SymbolRefSmallVectorTy *SymbolManager::getDependentSymbols( 372 const SymbolRef Primary) { 373 SymbolDependTy::const_iterator I = SymbolDependencies.find(Primary); 374 if (I == SymbolDependencies.end()) 379 void SymbolReaper::markDependentsLive(SymbolRef sym) { 380 // Do not mark dependents more then once. 381 SymbolMapTy::iterator LI = TheLiving.find(sym); 382 assert(LI != TheLiving.end() && "The primary symbol is not live."); 383 if (LI->second == HaveMarkedDependents) 385 LI->second = HaveMarkedDependents; 387 if (const SymbolRefSmallVectorTy *Deps = SymMgr.getDependentSymbols(sym)) { 388 for (const auto I : *Deps) { 389 if (TheLiving.find(I) != TheLiving.end()) 396 void SymbolReaper::markLive(SymbolRef sym) { 397 TheLiving[sym] = NotProcessed; 399 markDependentsLive(sym); 402 void SymbolReaper::markLive(const MemRegion *region) { 403 RegionRoots.insert(region); 404 markElementIndicesLive(region); 407 void SymbolReaper::markElementIndicesLive(const MemRegion *region) { 408 for (auto SR = dyn_cast<SubRegion>(region); SR; 409 SR = dyn_cast<SubRegion>(SR->getSuperRegion())) { 410 if (const auto ER = dyn_cast<ElementRegion>(SR)) { 411 SVal Idx = ER->getIndex(); 412 for (auto SI = Idx.symbol_begin(), SE = Idx.symbol_end(); SI != SE; ++SI) 418 void SymbolReaper::markInUse(SymbolRef sym) { 419 if (isa<SymbolMetadata>(sym)) 420 MetadataInUse.insert(sym); 423 bool SymbolReaper::maybeDead(SymbolRef sym) { 431 bool SymbolReaper::isLiveRegion(const MemRegion *MR) { 432 if (RegionRoots.count(MR)) 435 MR = MR->getBaseRegion(); 437 if (const auto *SR = dyn_cast<SymbolicRegion>(MR)) 438 return isLive(SR->getSymbol()); 440 if (const auto *VR = dyn_cast<VarRegion>(MR)) 441 return isLive(VR, true); 443 // FIXME: This is a gross over-approximation. What we really need is a way to 444 // tell if anything still refers to this region. Unlike SymbolicRegions, 445 // AllocaRegions don't have associated symbols, though, so we don
't actually 446 // have a way to track their liveness. 447 if (isa<AllocaRegion>(MR)) 450 if (isa<CXXThisRegion>(MR)) 453 if (isa<MemSpaceRegion>(MR)) 456 if (isa<CodeTextRegion>(MR)) 462 bool SymbolReaper::isLive(SymbolRef sym) { 463 if (TheLiving.count(sym)) { 464 markDependentsLive(sym); 470 switch (sym->getKind()) { 471 case SymExpr::SymbolRegionValueKind: 472 KnownLive = isLiveRegion(cast<SymbolRegionValue>(sym)->getRegion()); 474 case SymExpr::SymbolConjuredKind: 477 case SymExpr::SymbolDerivedKind: 478 KnownLive = isLive(cast<SymbolDerived>(sym)->getParentSymbol()); 480 case SymExpr::SymbolExtentKind: 481 KnownLive = isLiveRegion(cast<SymbolExtent>(sym)->getRegion()); 483 case SymExpr::SymbolMetadataKind: 484 KnownLive = MetadataInUse.count(sym) && 485 isLiveRegion(cast<SymbolMetadata>(sym)->getRegion()); 487 MetadataInUse.erase(sym); 489 case SymExpr::SymIntExprKind: 490 KnownLive = isLive(cast<SymIntExpr>(sym)->getLHS()); 492 case SymExpr::IntSymExprKind: 493 KnownLive = isLive(cast<IntSymExpr>(sym)->getRHS()); 495 case SymExpr::SymSymExprKind: 496 KnownLive = isLive(cast<SymSymExpr>(sym)->getLHS()) && 497 isLive(cast<SymSymExpr>(sym)->getRHS()); 499 case SymExpr::SymbolCastKind: 500 KnownLive = isLive(cast<SymbolCast>(sym)->getOperand()); 511 SymbolReaper::isLive(const Stmt *ExprVal, const LocationContext *ELCtx) const { 516 // If the reaper's location context is a parent of the expression
's 517 // location context, then the expression value is now "out of scope". 518 if (LCtx->isParentOf(ELCtx)) 523 // If no statement is provided, everything is this and parent contexts is live. 527 return LCtx->getAnalysis<RelaxedLiveVariables>()->isLive(Loc, ExprVal); 530 bool SymbolReaper::isLive(const VarRegion *VR, bool includeStoreBindings) const{ 531 const StackFrameContext *VarContext = VR->getStackFrame(); 538 const StackFrameContext *CurrentContext = LCtx->getStackFrame(); 540 if (VarContext == CurrentContext) { 541 // If no statement is provided, everything is live. 545 if (LCtx->getAnalysis<RelaxedLiveVariables>()->isLive(Loc, VR->getDecl())) 548 if (!includeStoreBindings) 551 unsigned &cachedQuery = 552 const_cast<SymbolReaper *>(this)->includedRegionCache[VR]; 555 return cachedQuery == 1; 558 // Query the store to see if the region occurs in any live bindings. 559 if (Store store = reapedStore.getStore()) { 561 reapedStore.getStoreManager().includedInBindings(store, VR); 562 cachedQuery = hasRegion ? 1 : 2; 569 return VarContext->isParentOf(CurrentContext); Defines the clang::ASTContext interface.
void dumpToStream(raw_ostream &os) const override
virtual void dump() const
void dumpToStream(raw_ostream &os) const override
StringRef getOpcodeStr() const
virtual void dumpToStream(raw_ostream &os) const
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
virtual QualType getType() const =0
void dumpToStream(raw_ostream &os) const override
void dumpToStream(raw_ostream &os) const override
Dataflow Directional Tag Classes.
BinaryOperator::Opcode getOpcode(const SymExpr *SE)
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
void dumpToStream(raw_ostream &os) const override
void dumpToStream(raw_ostream &os) const override
void dumpToStream(raw_ostream &os) const override
void dumpToStream(raw_ostream &os) const override