19 #include "llvm/Support/raw_ostream.h" 21 using namespace clang;
24 void SymExpr::anchor() { }
32 getLHS()->dumpToStream(os);
35 if (getRHS().isUnsigned())
36 os << getRHS().getZExtValue();
38 os << getRHS().getSExtValue();
39 if (getRHS().isUnsigned())
44 if (getLHS().isUnsigned())
45 os << getLHS().getZExtValue();
47 os << getLHS().getSExtValue();
48 if (getLHS().isUnsigned())
53 getRHS()->dumpToStream(os);
59 getLHS()->dumpToStream(os);
63 getRHS()->dumpToStream(os);
68 os <<
'(' << ToTy.getAsString() <<
") (";
69 Operand->dumpToStream(os);
74 os <<
"conj_$" << getSymbolID() <<
'{' <<
T.getAsString() <<
'}';
78 os <<
"derived_$" << getSymbolID() <<
'{' 79 << getParentSymbol() <<
',' << getRegion() <<
'}';
83 os <<
"extent_$" << getSymbolID() <<
'{' << getRegion() <<
'}';
87 os <<
"meta_$" << getSymbolID() <<
'{' 88 << getRegion() <<
',' <<
T.getAsString() <<
'}';
91 void SymbolData::anchor() { }
94 os <<
"reg_$" << getSymbolID()
98 bool SymExpr::symbol_iterator::operator==(const symbol_iterator &X) const { 102 bool SymExpr::symbol_iterator::operator!=(const symbol_iterator &X) const { 106 SymExpr::symbol_iterator::symbol_iterator(const SymExpr *SE) { 110 SymExpr::symbol_iterator &SymExpr::symbol_iterator::operator++() { 111 assert(!itr.empty() && "attempting to iterate on an 'end
' iterator"); 116 SymbolRef SymExpr::symbol_iterator::operator*() { 117 assert(!itr.empty() && "attempting to dereference an 'end
' iterator"); 121 void SymExpr::symbol_iterator::expand() { 122 const SymExpr *SE = itr.pop_back_val(); 124 switch (SE->getKind()) { 125 case SymExpr::SymbolRegionValueKind: 126 case SymExpr::SymbolConjuredKind: 127 case SymExpr::SymbolDerivedKind: 128 case SymExpr::SymbolExtentKind: 129 case SymExpr::SymbolMetadataKind: 131 case SymExpr::SymbolCastKind: 132 itr.push_back(cast<SymbolCast>(SE)->getOperand()); 134 case SymExpr::SymIntExprKind: 135 itr.push_back(cast<SymIntExpr>(SE)->getLHS()); 137 case SymExpr::IntSymExprKind: 138 itr.push_back(cast<IntSymExpr>(SE)->getRHS()); 140 case SymExpr::SymSymExprKind: { 141 const SymSymExpr *x = cast<SymSymExpr>(SE); 142 itr.push_back(x->getLHS()); 143 itr.push_back(x->getRHS()); 147 llvm_unreachable("unhandled expansion case"); 150 unsigned SymExpr::computeComplexity() const { 152 for (symbol_iterator I = symbol_begin(), E = symbol_end(); I != E; ++I) 157 const SymbolRegionValue* 158 SymbolManager::getRegionValueSymbol(const TypedValueRegion* R) { 159 llvm::FoldingSetNodeID profile; 160 SymbolRegionValue::Profile(profile, R); 162 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 164 SD = (SymExpr*) BPAlloc.Allocate<SymbolRegionValue>(); 165 new (SD) SymbolRegionValue(SymbolCounter, R); 166 DataSet.InsertNode(SD, InsertPos); 170 return cast<SymbolRegionValue>(SD); 173 const SymbolConjured* SymbolManager::conjureSymbol(const Stmt *E, 174 const LocationContext *LCtx, 177 const void *SymbolTag) { 178 llvm::FoldingSetNodeID profile; 179 SymbolConjured::Profile(profile, E, T, Count, LCtx, SymbolTag); 181 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 183 SD = (SymExpr*) BPAlloc.Allocate<SymbolConjured>(); 184 new (SD) SymbolConjured(SymbolCounter, E, LCtx, T, Count, SymbolTag); 185 DataSet.InsertNode(SD, InsertPos); 189 return cast<SymbolConjured>(SD); 193 SymbolManager::getDerivedSymbol(SymbolRef parentSymbol, 194 const TypedValueRegion *R) { 196 llvm::FoldingSetNodeID profile; 197 SymbolDerived::Profile(profile, parentSymbol, R); 199 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 201 SD = (SymExpr*) BPAlloc.Allocate<SymbolDerived>(); 202 new (SD) SymbolDerived(SymbolCounter, parentSymbol, R); 203 DataSet.InsertNode(SD, InsertPos); 207 return cast<SymbolDerived>(SD); 211 SymbolManager::getExtentSymbol(const SubRegion *R) { 212 llvm::FoldingSetNodeID profile; 213 SymbolExtent::Profile(profile, R); 215 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 217 SD = (SymExpr*) BPAlloc.Allocate<SymbolExtent>(); 218 new (SD) SymbolExtent(SymbolCounter, R); 219 DataSet.InsertNode(SD, InsertPos); 223 return cast<SymbolExtent>(SD); 226 const SymbolMetadata * 227 SymbolManager::getMetadataSymbol(const MemRegion* R, const Stmt *S, QualType T, 228 const LocationContext *LCtx, 229 unsigned Count, const void *SymbolTag) { 231 llvm::FoldingSetNodeID profile; 232 SymbolMetadata::Profile(profile, R, S, T, LCtx, Count, SymbolTag); 234 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 236 SD = (SymExpr*) BPAlloc.Allocate<SymbolMetadata>(); 237 new (SD) SymbolMetadata(SymbolCounter, R, S, T, LCtx, Count, SymbolTag); 238 DataSet.InsertNode(SD, InsertPos); 242 return cast<SymbolMetadata>(SD); 246 SymbolManager::getCastSymbol(const SymExpr *Op, 247 QualType From, QualType To) { 248 llvm::FoldingSetNodeID ID; 249 SymbolCast::Profile(ID, Op, From, To); 251 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 253 data = (SymbolCast*) BPAlloc.Allocate<SymbolCast>(); 254 new (data) SymbolCast(Op, From, To); 255 DataSet.InsertNode(data, InsertPos); 258 return cast<SymbolCast>(data); 261 const SymIntExpr *SymbolManager::getSymIntExpr(const SymExpr *lhs, 262 BinaryOperator::Opcode op, 263 const llvm::APSInt& v, 265 llvm::FoldingSetNodeID ID; 266 SymIntExpr::Profile(ID, lhs, op, v, t); 268 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 271 data = (SymIntExpr*) BPAlloc.Allocate<SymIntExpr>(); 272 new (data) SymIntExpr(lhs, op, v, t); 273 DataSet.InsertNode(data, InsertPos); 276 return cast<SymIntExpr>(data); 279 const IntSymExpr *SymbolManager::getIntSymExpr(const llvm::APSInt& lhs, 280 BinaryOperator::Opcode op, 283 llvm::FoldingSetNodeID ID; 284 IntSymExpr::Profile(ID, lhs, op, rhs, t); 286 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 289 data = (IntSymExpr*) BPAlloc.Allocate<IntSymExpr>(); 290 new (data) IntSymExpr(lhs, op, rhs, t); 291 DataSet.InsertNode(data, InsertPos); 294 return cast<IntSymExpr>(data); 297 const SymSymExpr *SymbolManager::getSymSymExpr(const SymExpr *lhs, 298 BinaryOperator::Opcode op, 301 llvm::FoldingSetNodeID ID; 302 SymSymExpr::Profile(ID, lhs, op, rhs, t); 304 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 307 data = (SymSymExpr*) BPAlloc.Allocate<SymSymExpr>(); 308 new (data) SymSymExpr(lhs, op, rhs, t); 309 DataSet.InsertNode(data, InsertPos); 312 return cast<SymSymExpr>(data); 315 QualType SymbolConjured::getType() const { 319 QualType SymbolDerived::getType() const { 320 return R->getValueType(); 323 QualType SymbolExtent::getType() const { 324 ASTContext &Ctx = R->getMemRegionManager()->getContext(); 325 return Ctx.getSizeType(); 328 QualType SymbolMetadata::getType() const { 332 QualType SymbolRegionValue::getType() const { 333 return R->getValueType(); 336 SymbolManager::~SymbolManager() { 337 llvm::DeleteContainerSeconds(SymbolDependencies); 340 bool SymbolManager::canSymbolicate(QualType T) { 341 T = T.getCanonicalType(); 343 if (Loc::isLocType(T)) 346 if (T->isIntegralOrEnumerationType()) 349 if (T->isRecordType() && !T->isUnionType()) 355 void SymbolManager::addSymbolDependency(const SymbolRef Primary, 356 const SymbolRef Dependent) { 357 SymbolDependTy::iterator I = SymbolDependencies.find(Primary); 358 SymbolRefSmallVectorTy *dependencies = nullptr; 359 if (I == SymbolDependencies.end()) { 360 dependencies = new SymbolRefSmallVectorTy(); 361 SymbolDependencies[Primary] = dependencies; 363 dependencies = I->second; 365 dependencies->push_back(Dependent); 368 const SymbolRefSmallVectorTy *SymbolManager::getDependentSymbols( 369 const SymbolRef Primary) { 370 SymbolDependTy::const_iterator I = SymbolDependencies.find(Primary); 371 if (I == SymbolDependencies.end()) 376 void SymbolReaper::markDependentsLive(SymbolRef sym) { 377 // Do not mark dependents more then once. 378 SymbolMapTy::iterator LI = TheLiving.find(sym); 379 assert(LI != TheLiving.end() && "The primary symbol is not live."); 380 if (LI->second == HaveMarkedDependents) 382 LI->second = HaveMarkedDependents; 384 if (const SymbolRefSmallVectorTy *Deps = SymMgr.getDependentSymbols(sym)) { 385 for (SymbolRefSmallVectorTy::const_iterator I = Deps->begin(), 386 E = Deps->end(); I != E; ++I) { 387 if (TheLiving.find(*I) != TheLiving.end()) 394 void SymbolReaper::markLive(SymbolRef sym) { 395 TheLiving[sym] = NotProcessed; 397 markDependentsLive(sym); 400 void SymbolReaper::markLive(const MemRegion *region) { 401 RegionRoots.insert(region); 402 markElementIndicesLive(region); 405 void SymbolReaper::markElementIndicesLive(const MemRegion *region) { 406 for (auto SR = dyn_cast<SubRegion>(region); SR; 407 SR = dyn_cast<SubRegion>(SR->getSuperRegion())) { 408 if (auto ER = dyn_cast<ElementRegion>(SR)) { 409 SVal Idx = ER->getIndex(); 410 for (auto SI = Idx.symbol_begin(), SE = Idx.symbol_end(); SI != SE; ++SI) 416 void SymbolReaper::markInUse(SymbolRef sym) { 417 if (isa<SymbolMetadata>(sym)) 418 MetadataInUse.insert(sym); 421 bool SymbolReaper::maybeDead(SymbolRef sym) { 429 bool SymbolReaper::isLiveRegion(const MemRegion *MR) { 430 if (RegionRoots.count(MR)) 433 MR = MR->getBaseRegion(); 435 if (const SymbolicRegion *SR = dyn_cast<SymbolicRegion>(MR)) 436 return isLive(SR->getSymbol()); 438 if (const VarRegion *VR = dyn_cast<VarRegion>(MR)) 439 return isLive(VR, true); 441 // FIXME: This is a gross over-approximation. What we really need is a way to 442 // tell if anything still refers to this region. Unlike SymbolicRegions, 443 // AllocaRegions don't have associated symbols, though, so we don
't actually 444 // have a way to track their liveness. 445 if (isa<AllocaRegion>(MR)) 448 if (isa<CXXThisRegion>(MR)) 451 if (isa<MemSpaceRegion>(MR)) 454 if (isa<CodeTextRegion>(MR)) 460 bool SymbolReaper::isLive(SymbolRef sym) { 461 if (TheLiving.count(sym)) { 462 markDependentsLive(sym); 468 switch (sym->getKind()) { 469 case SymExpr::SymbolRegionValueKind: 470 KnownLive = isLiveRegion(cast<SymbolRegionValue>(sym)->getRegion()); 472 case SymExpr::SymbolConjuredKind: 475 case SymExpr::SymbolDerivedKind: 476 KnownLive = isLive(cast<SymbolDerived>(sym)->getParentSymbol()); 478 case SymExpr::SymbolExtentKind: 479 KnownLive = isLiveRegion(cast<SymbolExtent>(sym)->getRegion()); 481 case SymExpr::SymbolMetadataKind: 482 KnownLive = MetadataInUse.count(sym) && 483 isLiveRegion(cast<SymbolMetadata>(sym)->getRegion()); 485 MetadataInUse.erase(sym); 487 case SymExpr::SymIntExprKind: 488 KnownLive = isLive(cast<SymIntExpr>(sym)->getLHS()); 490 case SymExpr::IntSymExprKind: 491 KnownLive = isLive(cast<IntSymExpr>(sym)->getRHS()); 493 case SymExpr::SymSymExprKind: 494 KnownLive = isLive(cast<SymSymExpr>(sym)->getLHS()) && 495 isLive(cast<SymSymExpr>(sym)->getRHS()); 497 case SymExpr::SymbolCastKind: 498 KnownLive = isLive(cast<SymbolCast>(sym)->getOperand()); 509 SymbolReaper::isLive(const Stmt *ExprVal, const LocationContext *ELCtx) const { 514 // If the reaper's location context is a parent of the expression
's 515 // location context, then the expression value is now "out of scope". 516 if (LCtx->isParentOf(ELCtx)) 521 // If no statement is provided, everything is this and parent contexts is live. 525 return LCtx->getAnalysis<RelaxedLiveVariables>()->isLive(Loc, ExprVal); 528 bool SymbolReaper::isLive(const VarRegion *VR, bool includeStoreBindings) const{ 529 const StackFrameContext *VarContext = VR->getStackFrame(); 536 const StackFrameContext *CurrentContext = LCtx->getCurrentStackFrame(); 538 if (VarContext == CurrentContext) { 539 // If no statement is provided, everything is live. 543 if (LCtx->getAnalysis<RelaxedLiveVariables>()->isLive(Loc, VR->getDecl())) 546 if (!includeStoreBindings) 549 unsigned &cachedQuery = 550 const_cast<SymbolReaper*>(this)->includedRegionCache[VR]; 553 return cachedQuery == 1; 556 // Query the store to see if the region occurs in any live bindings. 557 if (Store store = reapedStore.getStore()) { 559 reapedStore.getStoreManager().includedInBindings(store, VR); 560 cachedQuery = hasRegion ? 1 : 2; 567 return VarContext->isParentOf(CurrentContext);
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
virtual QualType getType() const =0
const FunctionProtoType * T
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