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_$" << getSymbolID() <<
'{' << T.getAsString() <<
", LC" 89 os <<
", S" << S->getID(LCtx->getDecl()->getASTContext());
92 os <<
", #" << Count <<
'}';
96 os <<
"derived_$" << getSymbolID() <<
'{' 97 << getParentSymbol() <<
',' << getRegion() <<
'}';
101 os <<
"extent_$" << getSymbolID() <<
'{' << getRegion() <<
'}';
105 os <<
"meta_$" << getSymbolID() <<
'{' 106 << getRegion() <<
',' << T.getAsString() <<
'}';
109 void SymbolData::anchor() {}
112 os <<
"reg_$" << getSymbolID()
116 bool SymExpr::symbol_iterator::operator==(const symbol_iterator &X) const { 120 bool SymExpr::symbol_iterator::operator!=(const symbol_iterator &X) const { 124 SymExpr::symbol_iterator::symbol_iterator(const SymExpr *SE) { 128 SymExpr::symbol_iterator &SymExpr::symbol_iterator::operator++() { 129 assert(!itr.empty() && "attempting to iterate on an 'end
' iterator"); 134 SymbolRef SymExpr::symbol_iterator::operator*() { 135 assert(!itr.empty() && "attempting to dereference an 'end
' iterator"); 139 void SymExpr::symbol_iterator::expand() { 140 const SymExpr *SE = itr.pop_back_val(); 142 switch (SE->getKind()) { 143 case SymExpr::SymbolRegionValueKind: 144 case SymExpr::SymbolConjuredKind: 145 case SymExpr::SymbolDerivedKind: 146 case SymExpr::SymbolExtentKind: 147 case SymExpr::SymbolMetadataKind: 149 case SymExpr::SymbolCastKind: 150 itr.push_back(cast<SymbolCast>(SE)->getOperand()); 152 case SymExpr::SymIntExprKind: 153 itr.push_back(cast<SymIntExpr>(SE)->getLHS()); 155 case SymExpr::IntSymExprKind: 156 itr.push_back(cast<IntSymExpr>(SE)->getRHS()); 158 case SymExpr::SymSymExprKind: { 159 const auto *x = cast<SymSymExpr>(SE); 160 itr.push_back(x->getLHS()); 161 itr.push_back(x->getRHS()); 165 llvm_unreachable("unhandled expansion case"); 168 const SymbolRegionValue* 169 SymbolManager::getRegionValueSymbol(const TypedValueRegion* R) { 170 llvm::FoldingSetNodeID profile; 171 SymbolRegionValue::Profile(profile, R); 173 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 175 SD = (SymExpr*) BPAlloc.Allocate<SymbolRegionValue>(); 176 new (SD) SymbolRegionValue(SymbolCounter, R); 177 DataSet.InsertNode(SD, InsertPos); 181 return cast<SymbolRegionValue>(SD); 184 const SymbolConjured* SymbolManager::conjureSymbol(const Stmt *E, 185 const LocationContext *LCtx, 188 const void *SymbolTag) { 189 llvm::FoldingSetNodeID profile; 190 SymbolConjured::Profile(profile, E, T, Count, LCtx, SymbolTag); 192 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 194 SD = (SymExpr*) BPAlloc.Allocate<SymbolConjured>(); 195 new (SD) SymbolConjured(SymbolCounter, E, LCtx, T, Count, SymbolTag); 196 DataSet.InsertNode(SD, InsertPos); 200 return cast<SymbolConjured>(SD); 204 SymbolManager::getDerivedSymbol(SymbolRef parentSymbol, 205 const TypedValueRegion *R) { 206 llvm::FoldingSetNodeID profile; 207 SymbolDerived::Profile(profile, parentSymbol, R); 209 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 211 SD = (SymExpr*) BPAlloc.Allocate<SymbolDerived>(); 212 new (SD) SymbolDerived(SymbolCounter, parentSymbol, R); 213 DataSet.InsertNode(SD, InsertPos); 217 return cast<SymbolDerived>(SD); 221 SymbolManager::getExtentSymbol(const SubRegion *R) { 222 llvm::FoldingSetNodeID profile; 223 SymbolExtent::Profile(profile, R); 225 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 227 SD = (SymExpr*) BPAlloc.Allocate<SymbolExtent>(); 228 new (SD) SymbolExtent(SymbolCounter, R); 229 DataSet.InsertNode(SD, InsertPos); 233 return cast<SymbolExtent>(SD); 236 const SymbolMetadata * 237 SymbolManager::getMetadataSymbol(const MemRegion* R, const Stmt *S, QualType T, 238 const LocationContext *LCtx, 239 unsigned Count, const void *SymbolTag) { 240 llvm::FoldingSetNodeID profile; 241 SymbolMetadata::Profile(profile, R, S, T, LCtx, Count, SymbolTag); 243 SymExpr *SD = DataSet.FindNodeOrInsertPos(profile, InsertPos); 245 SD = (SymExpr*) BPAlloc.Allocate<SymbolMetadata>(); 246 new (SD) SymbolMetadata(SymbolCounter, R, S, T, LCtx, Count, SymbolTag); 247 DataSet.InsertNode(SD, InsertPos); 251 return cast<SymbolMetadata>(SD); 255 SymbolManager::getCastSymbol(const SymExpr *Op, 256 QualType From, QualType To) { 257 llvm::FoldingSetNodeID ID; 258 SymbolCast::Profile(ID, Op, From, To); 260 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 262 data = (SymbolCast*) BPAlloc.Allocate<SymbolCast>(); 263 new (data) SymbolCast(Op, From, To); 264 DataSet.InsertNode(data, InsertPos); 267 return cast<SymbolCast>(data); 270 const SymIntExpr *SymbolManager::getSymIntExpr(const SymExpr *lhs, 271 BinaryOperator::Opcode op, 272 const llvm::APSInt& v, 274 llvm::FoldingSetNodeID ID; 275 SymIntExpr::Profile(ID, lhs, op, v, t); 277 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 280 data = (SymIntExpr*) BPAlloc.Allocate<SymIntExpr>(); 281 new (data) SymIntExpr(lhs, op, v, t); 282 DataSet.InsertNode(data, InsertPos); 285 return cast<SymIntExpr>(data); 288 const IntSymExpr *SymbolManager::getIntSymExpr(const llvm::APSInt& lhs, 289 BinaryOperator::Opcode op, 292 llvm::FoldingSetNodeID ID; 293 IntSymExpr::Profile(ID, lhs, op, rhs, t); 295 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 298 data = (IntSymExpr*) BPAlloc.Allocate<IntSymExpr>(); 299 new (data) IntSymExpr(lhs, op, rhs, t); 300 DataSet.InsertNode(data, InsertPos); 303 return cast<IntSymExpr>(data); 306 const SymSymExpr *SymbolManager::getSymSymExpr(const SymExpr *lhs, 307 BinaryOperator::Opcode op, 310 llvm::FoldingSetNodeID ID; 311 SymSymExpr::Profile(ID, lhs, op, rhs, t); 313 SymExpr *data = DataSet.FindNodeOrInsertPos(ID, InsertPos); 316 data = (SymSymExpr*) BPAlloc.Allocate<SymSymExpr>(); 317 new (data) SymSymExpr(lhs, op, rhs, t); 318 DataSet.InsertNode(data, InsertPos); 321 return cast<SymSymExpr>(data); 324 QualType SymbolConjured::getType() const { 328 QualType SymbolDerived::getType() const { 329 return R->getValueType(); 332 QualType SymbolExtent::getType() const { 333 ASTContext &Ctx = R->getMemRegionManager()->getContext(); 334 return Ctx.getSizeType(); 337 QualType SymbolMetadata::getType() const { 341 QualType SymbolRegionValue::getType() const { 342 return R->getValueType(); 345 SymbolManager::~SymbolManager() { 346 llvm::DeleteContainerSeconds(SymbolDependencies); 349 bool SymbolManager::canSymbolicate(QualType T) { 350 T = T.getCanonicalType(); 352 if (Loc::isLocType(T)) 355 if (T->isIntegralOrEnumerationType()) 358 if (T->isRecordType() && !T->isUnionType()) 364 void SymbolManager::addSymbolDependency(const SymbolRef Primary, 365 const SymbolRef Dependent) { 366 SymbolDependTy::iterator I = SymbolDependencies.find(Primary); 367 SymbolRefSmallVectorTy *dependencies = nullptr; 368 if (I == SymbolDependencies.end()) { 369 dependencies = new SymbolRefSmallVectorTy(); 370 SymbolDependencies[Primary] = dependencies; 372 dependencies = I->second; 374 dependencies->push_back(Dependent); 377 const SymbolRefSmallVectorTy *SymbolManager::getDependentSymbols( 378 const SymbolRef Primary) { 379 SymbolDependTy::const_iterator I = SymbolDependencies.find(Primary); 380 if (I == SymbolDependencies.end()) 385 void SymbolReaper::markDependentsLive(SymbolRef sym) { 386 // Do not mark dependents more then once. 387 SymbolMapTy::iterator LI = TheLiving.find(sym); 388 assert(LI != TheLiving.end() && "The primary symbol is not live."); 389 if (LI->second == HaveMarkedDependents) 391 LI->second = HaveMarkedDependents; 393 if (const SymbolRefSmallVectorTy *Deps = SymMgr.getDependentSymbols(sym)) { 394 for (const auto I : *Deps) { 395 if (TheLiving.find(I) != TheLiving.end()) 402 void SymbolReaper::markLive(SymbolRef sym) { 403 TheLiving[sym] = NotProcessed; 404 markDependentsLive(sym); 407 void SymbolReaper::markLive(const MemRegion *region) { 408 RegionRoots.insert(region); 409 markElementIndicesLive(region); 412 void SymbolReaper::markElementIndicesLive(const MemRegion *region) { 413 for (auto SR = dyn_cast<SubRegion>(region); SR; 414 SR = dyn_cast<SubRegion>(SR->getSuperRegion())) { 415 if (const auto ER = dyn_cast<ElementRegion>(SR)) { 416 SVal Idx = ER->getIndex(); 417 for (auto SI = Idx.symbol_begin(), SE = Idx.symbol_end(); SI != SE; ++SI) 423 void SymbolReaper::markInUse(SymbolRef sym) { 424 if (isa<SymbolMetadata>(sym)) 425 MetadataInUse.insert(sym); 428 bool SymbolReaper::isLiveRegion(const MemRegion *MR) { 429 if (RegionRoots.count(MR)) 432 MR = MR->getBaseRegion(); 434 if (const auto *SR = dyn_cast<SymbolicRegion>(MR)) 435 return isLive(SR->getSymbol()); 437 if (const auto *VR = dyn_cast<VarRegion>(MR)) 438 return isLive(VR, true); 440 // FIXME: This is a gross over-approximation. What we really need is a way to 441 // tell if anything still refers to this region. Unlike SymbolicRegions, 442 // AllocaRegions don't have associated symbols, though, so we don
't actually 443 // have a way to track their liveness. 444 if (isa<AllocaRegion>(MR)) 447 if (isa<CXXThisRegion>(MR)) 450 if (isa<MemSpaceRegion>(MR)) 453 if (isa<CodeTextRegion>(MR)) 459 bool SymbolReaper::isLive(SymbolRef sym) { 460 if (TheLiving.count(sym)) { 461 markDependentsLive(sym); 467 switch (sym->getKind()) { 468 case SymExpr::SymbolRegionValueKind: 469 KnownLive = isLiveRegion(cast<SymbolRegionValue>(sym)->getRegion()); 471 case SymExpr::SymbolConjuredKind: 474 case SymExpr::SymbolDerivedKind: 475 KnownLive = isLive(cast<SymbolDerived>(sym)->getParentSymbol()); 477 case SymExpr::SymbolExtentKind: 478 KnownLive = isLiveRegion(cast<SymbolExtent>(sym)->getRegion()); 480 case SymExpr::SymbolMetadataKind: 481 KnownLive = MetadataInUse.count(sym) && 482 isLiveRegion(cast<SymbolMetadata>(sym)->getRegion()); 484 MetadataInUse.erase(sym); 486 case SymExpr::SymIntExprKind: 487 KnownLive = isLive(cast<SymIntExpr>(sym)->getLHS()); 489 case SymExpr::IntSymExprKind: 490 KnownLive = isLive(cast<IntSymExpr>(sym)->getRHS()); 492 case SymExpr::SymSymExprKind: 493 KnownLive = isLive(cast<SymSymExpr>(sym)->getLHS()) && 494 isLive(cast<SymSymExpr>(sym)->getRHS()); 496 case SymExpr::SymbolCastKind: 497 KnownLive = isLive(cast<SymbolCast>(sym)->getOperand()); 508 SymbolReaper::isLive(const Stmt *ExprVal, const LocationContext *ELCtx) const { 513 // If the reaper's location context is a parent of the expression
's 514 // location context, then the expression value is now "out of scope". 515 if (LCtx->isParentOf(ELCtx)) 520 // If no statement is provided, everything is this and parent contexts is live. 524 return LCtx->getAnalysis<RelaxedLiveVariables>()->isLive(Loc, ExprVal); 527 bool SymbolReaper::isLive(const VarRegion *VR, bool includeStoreBindings) const{ 528 const StackFrameContext *VarContext = VR->getStackFrame(); 535 const StackFrameContext *CurrentContext = LCtx->getStackFrame(); 537 if (VarContext == CurrentContext) { 538 // If no statement is provided, everything is live. 542 if (LCtx->getAnalysis<RelaxedLiveVariables>()->isLive(Loc, VR->getDecl())) 545 if (!includeStoreBindings) 548 unsigned &cachedQuery = 549 const_cast<SymbolReaper *>(this)->includedRegionCache[VR]; 552 return cachedQuery == 1; 555 // Query the store to see if the region occurs in any live bindings. 556 if (Store store = reapedStore.getStore()) { 558 reapedStore.getStoreManager().includedInBindings(store, VR); 559 cachedQuery = hasRegion ? 1 : 2; 566 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