DeadStoresChecker.cpp revision cfa88f893915ceb8ae4ce2f17c46c24a4d67502f
156b1f71156db11b9c8234ca621c29213a73218e0Ted Kremenek//==- DeadStoresChecker.cpp - Check for stores to dead variables -*- C++ -*-==// 21ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// 31ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// The LLVM Compiler Infrastructure 41ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 71ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// 81ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek//===----------------------------------------------------------------------===// 91ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// 10843e934ba8c6ebc00d2f6969a50af7074597e8e3Gabor Greif// This file defines a DeadStores, a flow-sensitive checker that looks for 111ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// stores to variables that are no longer live. 121ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek// 131ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek//===----------------------------------------------------------------------===// 141ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek 157dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis#include "ClangSACheckers.h" 16ce1cab9fc0b4aec9cdef1b30a14e4ccdca3ac5f1Ted Kremenek#include "clang/AST/ASTContext.h" 172fa67efeaf66a9332c30a026dc1c21bef6c33a6cBenjamin Kramer#include "clang/AST/Attr.h" 181a654b60ef40e84f3943cdb581795c4d4dae1e45Ted Kremenek#include "clang/AST/ParentMap.h" 192827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek#include "clang/AST/RecursiveASTVisitor.h" 2019948ac84f145b9ea576db2faefda1927c249e44Ted Kremenek#include "clang/Analysis/Analyses/LiveVariables.h" 2119948ac84f145b9ea576db2faefda1927c249e44Ted Kremenek#include "clang/Analysis/Visitors/CFGRecStmtDeclVisitor.h" 2219948ac84f145b9ea576db2faefda1927c249e44Ted Kremenek#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h" 2319948ac84f145b9ea576db2faefda1927c249e44Ted Kremenek#include "clang/StaticAnalyzer/Core/Checker.h" 2419948ac84f145b9ea576db2faefda1927c249e44Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h" 2519948ac84f145b9ea576db2faefda1927c249e44Ted Kremenek#include "llvm/ADT/BitVector.h" 268fe83e1df954d72c0f4ffc15d20a5222ec151c21Benjamin Kramer#include "llvm/ADT/SmallString.h" 272827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek#include "llvm/Support/SaveAndRestore.h" 281ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek 291ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenekusing namespace clang; 309ef6537a894c33003359b1f9b9676e9178e028b7Ted Kremenekusing namespace ento; 311ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek 322827f5af018c515986ffb1779ec2e7246988f150Ted Kremeneknamespace { 332827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 342827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek/// A simple visitor to record what VarDecls occur in EH-handling code. 352827f5af018c515986ffb1779ec2e7246988f150Ted Kremenekclass EHCodeVisitor : public RecursiveASTVisitor<EHCodeVisitor> { 362827f5af018c515986ffb1779ec2e7246988f150Ted Kremenekpublic: 372827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek bool inEH; 382827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek llvm::DenseSet<const VarDecl *> &S; 392827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 402827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek bool TraverseObjCAtFinallyStmt(ObjCAtFinallyStmt *S) { 412827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek SaveAndRestore<bool> inFinally(inEH, true); 422827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek return ::RecursiveASTVisitor<EHCodeVisitor>::TraverseObjCAtFinallyStmt(S); 432827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek } 442827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 452827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek bool TraverseObjCAtCatchStmt(ObjCAtCatchStmt *S) { 462827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek SaveAndRestore<bool> inCatch(inEH, true); 472827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek return ::RecursiveASTVisitor<EHCodeVisitor>::TraverseObjCAtCatchStmt(S); 482827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek } 492827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 502827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek bool TraverseCXXCatchStmt(CXXCatchStmt *S) { 512827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek SaveAndRestore<bool> inCatch(inEH, true); 522827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek return TraverseStmt(S->getHandlerBlock()); 532827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek } 542827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 552827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek bool VisitDeclRefExpr(DeclRefExpr *DR) { 562827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek if (inEH) 572827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek if (const VarDecl *D = dyn_cast<VarDecl>(DR->getDecl())) 582827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek S.insert(D); 592827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek return true; 602827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek } 612827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 622827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek EHCodeVisitor(llvm::DenseSet<const VarDecl *> &S) : 632827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek inEH(false), S(S) {} 642827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek}; 651a654b60ef40e84f3943cdb581795c4d4dae1e45Ted Kremenek 66848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek// FIXME: Eventually migrate into its own file, and have it managed by 67848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek// AnalysisManager. 68848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenekclass ReachableCode { 69848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek const CFG &cfg; 70848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek llvm::BitVector reachable; 71848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenekpublic: 72848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek ReachableCode(const CFG &cfg) 73848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek : cfg(cfg), reachable(cfg.getNumBlockIDs(), false) {} 74848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 75848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek void computeReachableBlocks(); 76848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 77848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek bool isReachable(const CFGBlock *block) const { 78848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek return reachable[block->getBlockID()]; 79848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek } 80848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek}; 81848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek} 82848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 83848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenekvoid ReachableCode::computeReachableBlocks() { 84848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek if (!cfg.getNumBlockIDs()) 85848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek return; 86848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 875f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<const CFGBlock*, 10> worklist; 88848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek worklist.push_back(&cfg.getEntry()); 89848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 90848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek while (!worklist.empty()) { 91848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek const CFGBlock *block = worklist.back(); 92848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek worklist.pop_back(); 93848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek llvm::BitVector::reference isReachable = reachable[block->getBlockID()]; 94848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek if (isReachable) 95848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek continue; 96848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek isReachable = true; 97848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek for (CFGBlock::const_succ_iterator i = block->succ_begin(), 98848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek e = block->succ_end(); i != e; ++i) 99848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek if (const CFGBlock *succ = *i) 100848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek worklist.push_back(succ); 101848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek } 102848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek} 103848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 104bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenekstatic const Expr *LookThroughTransitiveAssignments(const Expr *Ex) { 105bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek while (Ex) { 106bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek const BinaryOperator *BO = 107bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek dyn_cast<BinaryOperator>(Ex->IgnoreParenCasts()); 108bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (!BO) 109bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek break; 110bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (BO->getOpcode() == BO_Assign) { 111bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek Ex = BO->getRHS(); 112bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek continue; 113bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek } 114bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek break; 115bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek } 116bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek return Ex; 117bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek} 118bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek 119848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremeneknamespace { 120882998923889a2fcce9b49696506c499e22cf38fTed Kremenekclass DeadStoreObs : public LiveVariables::Observer { 121848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek const CFG &cfg; 122c0508f9fe37a3afb1ccad39879348272545e55dbChris Lattner ASTContext &Ctx; 1238f2698621f5090db1dea691059bd0ebd79fb7f14Ted Kremenek BugReporter& BR; 1241d26f48dc2eea1c07431ca1519d7034a21b9bcffTed Kremenek AnalysisDeclContext* AC; 1251a654b60ef40e84f3943cdb581795c4d4dae1e45Ted Kremenek ParentMap& Parents; 126882998923889a2fcce9b49696506c499e22cf38fTed Kremenek llvm::SmallPtrSet<const VarDecl*, 20> Escaped; 1276f42b62b6194f53bcbc349f5d17388e1936535d7Dylan Noblesmith OwningPtr<ReachableCode> reachableCode; 128848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek const CFGBlock *currentBlock; 129cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko OwningPtr<llvm::DenseSet<const VarDecl *> > InEH; 1301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1312cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek enum DeadStoreKind { Standard, Enclosing, DeadIncrement, DeadInit }; 1321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1331ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenekpublic: 134848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek DeadStoreObs(const CFG &cfg, ASTContext &ctx, 1351d26f48dc2eea1c07431ca1519d7034a21b9bcffTed Kremenek BugReporter& br, AnalysisDeclContext* ac, ParentMap& parents, 136882998923889a2fcce9b49696506c499e22cf38fTed Kremenek llvm::SmallPtrSet<const VarDecl*, 20> &escaped) 137590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks : cfg(cfg), Ctx(ctx), BR(br), AC(ac), Parents(parents), 138848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek Escaped(escaped), currentBlock(0) {} 1391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 140fdd225ed6f362a8550e597eb875d9c402b8a309cTed Kremenek virtual ~DeadStoreObs() {} 141b930d7adb7cb7642c9c49b39df04ebd5cbfa713aTed Kremenek 1422827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek bool isLive(const LiveVariables::LivenessValues &Live, const VarDecl *D) { 1432827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek if (Live.isLive(D)) 1442827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek return true; 1452827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek // Lazily construct the set that records which VarDecls are in 1462827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek // EH code. 1472827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek if (!InEH.get()) { 1482827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek InEH.reset(new llvm::DenseSet<const VarDecl *>()); 1492827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek EHCodeVisitor V(*InEH.get()); 1502827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek V.TraverseStmt(AC->getBody()); 1512827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek } 1522827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek // Treat all VarDecls that occur in EH code as being "always live" 1532827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek // when considering to suppress dead stores. Frequently stores 1542827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek // are followed by reads in EH code, but we don't have the ability 1552827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek // to analyze that yet. 1562827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek return InEH->count(D); 1572827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek } 1582827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek 1599c378f705405d37f49795d5e915989de774fe11fTed Kremenek void Report(const VarDecl *V, DeadStoreKind dsk, 160590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks PathDiagnosticLocation L, SourceRange R) { 161f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek if (Escaped.count(V)) 162f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek return; 163848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 164848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek // Compute reachable blocks within the CFG for trivial cases 165848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek // where a bogus dead store can be reported because itself is unreachable. 166848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek if (!reachableCode.get()) { 167848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek reachableCode.reset(new ReachableCode(cfg)); 168848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek reachableCode->computeReachableBlocks(); 169848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek } 170848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 171848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek if (!reachableCode->isReachable(currentBlock)) 172848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek return; 1738f2698621f5090db1dea691059bd0ebd79fb7f14Ted Kremenek 174f7ccbad5d9949e7ddd1cbef43d482553b811e026Dylan Noblesmith SmallString<64> buf; 1757df1234c2e62b2a23dc4417e527f941c20ebe858Jordy Rose llvm::raw_svector_ostream os(buf); 1767df1234c2e62b2a23dc4417e527f941c20ebe858Jordy Rose const char *BugType = 0; 1771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1782cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek switch (dsk) { 1792cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek case DeadInit: 180efc620c4eb14d2ff59e3ec0714602997ffeddfd7Ted Kremenek BugType = "Dead initialization"; 181b8989f27f116ff2400e92a52c067a69846119eb5Benjamin Kramer os << "Value stored to '" << *V 1827df1234c2e62b2a23dc4417e527f941c20ebe858Jordy Rose << "' during its initialization is never read"; 1832cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek break; 1841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1852cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek case DeadIncrement: 186efc620c4eb14d2ff59e3ec0714602997ffeddfd7Ted Kremenek BugType = "Dead increment"; 1872cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek case Standard: 188efc620c4eb14d2ff59e3ec0714602997ffeddfd7Ted Kremenek if (!BugType) BugType = "Dead assignment"; 189b8989f27f116ff2400e92a52c067a69846119eb5Benjamin Kramer os << "Value stored to '" << *V << "' is never read"; 1902cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek break; 1911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1922cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek case Enclosing: 19356b1f71156db11b9c8234ca621c29213a73218e0Ted Kremenek // Don't report issues in this case, e.g.: "if (x = foo())", 19456b1f71156db11b9c8234ca621c29213a73218e0Ted Kremenek // where 'x' is unused later. We have yet to see a case where 19556b1f71156db11b9c8234ca621c29213a73218e0Ted Kremenek // this is a real bug. 19656b1f71156db11b9c8234ca621c29213a73218e0Ted Kremenek return; 197f9c2a5d1b49b60962b613a1dfffa23831ca298a2Ted Kremenek } 1981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 19907189521a15d9c088216b943649cb9fe231cbb57Ted Kremenek BR.EmitBasicReport(AC->getDecl(), BugType, "Dead store", os.str(), L, R); 2001a654b60ef40e84f3943cdb581795c4d4dae1e45Ted Kremenek } 2011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2029c378f705405d37f49795d5e915989de774fe11fTed Kremenek void CheckVarDecl(const VarDecl *VD, const Expr *Ex, const Expr *Val, 2032cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek DeadStoreKind dsk, 204882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const LiveVariables::LivenessValues &Live) { 2051a654b60ef40e84f3943cdb581795c4d4dae1e45Ted Kremenek 206852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek if (!VD->hasLocalStorage()) 207852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek return; 208852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek // Reference types confuse the dead stores checker. Skip them 209852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek // for now. 210852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek if (VD->getType()->getAs<ReferenceType>()) 211852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek return; 212852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek 2132827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek if (!isLive(Live, VD) && 214590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks !(VD->getAttr<UnusedAttr>() || VD->getAttr<BlocksAttr>())) { 215590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks 216590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks PathDiagnosticLocation ExLoc = 217590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks PathDiagnosticLocation::createBegin(Ex, BR.getSourceManager(), AC); 218590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks Report(VD, dsk, ExLoc, Val->getSourceRange()); 219590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks } 2203eb817e5095d25e7bf4a8df9ed3f9b13bed6f298Ted Kremenek } 2211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2229c378f705405d37f49795d5e915989de774fe11fTed Kremenek void CheckDeclRef(const DeclRefExpr *DR, const Expr *Val, DeadStoreKind dsk, 223882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const LiveVariables::LivenessValues& Live) { 2249c378f705405d37f49795d5e915989de774fe11fTed Kremenek if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) 225882998923889a2fcce9b49696506c499e22cf38fTed Kremenek CheckVarDecl(VD, DR, Val, dsk, Live); 2262cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek } 2271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2289c378f705405d37f49795d5e915989de774fe11fTed Kremenek bool isIncrement(VarDecl *VD, const BinaryOperator* B) { 2292cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek if (B->isCompoundAssignmentOp()) 2302cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek return true; 2311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2329c378f705405d37f49795d5e915989de774fe11fTed Kremenek const Expr *RHS = B->getRHS()->IgnoreParenCasts(); 233882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const BinaryOperator* BRHS = dyn_cast<BinaryOperator>(RHS); 2341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2352cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek if (!BRHS) 2362cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek return false; 2371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 238882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const DeclRefExpr *DR; 2391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2402cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek if ((DR = dyn_cast<DeclRefExpr>(BRHS->getLHS()->IgnoreParenCasts()))) 2412cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek if (DR->getDecl() == VD) 2422cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek return true; 2431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2442cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek if ((DR = dyn_cast<DeclRefExpr>(BRHS->getRHS()->IgnoreParenCasts()))) 2452cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek if (DR->getDecl() == VD) 2462cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek return true; 2471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2482cfac226b028e5a2165af077268f70cd2ab4b1a8Ted Kremenek return false; 249a23157e6b9e2388edebd3d383dd7acfab6a4c0c0Ted Kremenek } 2501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2519c378f705405d37f49795d5e915989de774fe11fTed Kremenek virtual void observeStmt(const Stmt *S, const CFGBlock *block, 252882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const LiveVariables::LivenessValues &Live) { 2531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 254848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek currentBlock = block; 255848ec83483ca4ba52ed72c7e29ebc330f8c87252Ted Kremenek 2561c86b156ff5b6e42319add892c0b18eb12f6b32bTed Kremenek // Skip statements in macros. 2571c86b156ff5b6e42319add892c0b18eb12f6b32bTed Kremenek if (S->getLocStart().isMacroID()) 2581c86b156ff5b6e42319add892c0b18eb12f6b32bTed Kremenek return; 2591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 260f4e532b5a1683a9f6c842f361c7415bf3474315fTed Kremenek // Only cover dead stores from regular assignments. ++/-- dead stores 261f4e532b5a1683a9f6c842f361c7415bf3474315fTed Kremenek // have never flagged a real bug. 262882998923889a2fcce9b49696506c499e22cf38fTed Kremenek if (const BinaryOperator* B = dyn_cast<BinaryOperator>(S)) { 263fdd225ed6f362a8550e597eb875d9c402b8a309cTed Kremenek if (!B->isAssignmentOp()) return; // Skip non-assignments. 2641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2659c378f705405d37f49795d5e915989de774fe11fTed Kremenek if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(B->getLHS())) 2661a654b60ef40e84f3943cdb581795c4d4dae1e45Ted Kremenek if (VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) { 267e12691c2a2109016df12b2cbf54d51a921e6b618Ted Kremenek // Special case: check for assigning null to a pointer. 2681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // This is a common form of defensive programming. 269bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek const Expr *RHS = LookThroughTransitiveAssignments(B->getRHS()); 270bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek 271891322002b5f5886d812f6e8df12174fb2d8e73bTed Kremenek QualType T = VD->getType(); 272891322002b5f5886d812f6e8df12174fb2d8e73bTed Kremenek if (T->isPointerType() || T->isObjCObjectPointerType()) { 273bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (RHS->isNullPointerConstant(Ctx, Expr::NPC_ValueDependentIsNull)) 27493fab7c94008d9e2b1e4ce15784544c6710945feTed Kremenek return; 275e12691c2a2109016df12b2cbf54d51a921e6b618Ted Kremenek } 27693fab7c94008d9e2b1e4ce15784544c6710945feTed Kremenek 277bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek RHS = RHS->IgnoreParenCasts(); 2783b58786f85aaa173e122f6eaff0b6efa233d59a2Ted Kremenek // Special case: self-assignments. These are often used to shut up 2793b58786f85aaa173e122f6eaff0b6efa233d59a2Ted Kremenek // "unused variable" compiler warnings. 280bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (const DeclRefExpr *RhsDR = dyn_cast<DeclRefExpr>(RHS)) 2813b58786f85aaa173e122f6eaff0b6efa233d59a2Ted Kremenek if (VD == dyn_cast<VarDecl>(RhsDR->getDecl())) 2823b58786f85aaa173e122f6eaff0b6efa233d59a2Ted Kremenek return; 2831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2843b58786f85aaa173e122f6eaff0b6efa233d59a2Ted Kremenek // Otherwise, issue a warning. 285b930d7adb7cb7642c9c49b39df04ebd5cbfa713aTed Kremenek DeadStoreKind dsk = Parents.isConsumedExpr(B) 2861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump ? Enclosing 2877f5fce7200fdbf03f7d70134a57271e584fcb766Ted Kremenek : (isIncrement(VD,B) ? DeadIncrement : Standard); 2881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 289882998923889a2fcce9b49696506c499e22cf38fTed Kremenek CheckVarDecl(VD, DR, B->getRHS(), dsk, Live); 2901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 2911ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek } 292882998923889a2fcce9b49696506c499e22cf38fTed Kremenek else if (const UnaryOperator* U = dyn_cast<UnaryOperator>(S)) { 293f4e532b5a1683a9f6c842f361c7415bf3474315fTed Kremenek if (!U->isIncrementOp() || U->isPrefix()) 294a23157e6b9e2388edebd3d383dd7acfab6a4c0c0Ted Kremenek return; 2951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 296882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const Stmt *parent = Parents.getParentIgnoreParenCasts(U); 297f4e532b5a1683a9f6c842f361c7415bf3474315fTed Kremenek if (!parent || !isa<ReturnStmt>(parent)) 298380277e46ec1d2d9abedcddf357ceea935cbe576Ted Kremenek return; 299b0f36323d9d8392075274b95816e2241f99ddb0dTed Kremenek 300882998923889a2fcce9b49696506c499e22cf38fTed Kremenek const Expr *Ex = U->getSubExpr()->IgnoreParenCasts(); 3011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3029c378f705405d37f49795d5e915989de774fe11fTed Kremenek if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Ex)) 303882998923889a2fcce9b49696506c499e22cf38fTed Kremenek CheckDeclRef(DR, U, DeadIncrement, Live); 3041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 3059c378f705405d37f49795d5e915989de774fe11fTed Kremenek else if (const DeclStmt *DS = dyn_cast<DeclStmt>(S)) 306fdd225ed6f362a8550e597eb875d9c402b8a309cTed Kremenek // Iterate through the decls. Warn if any initializers are complex 307fdd225ed6f362a8550e597eb875d9c402b8a309cTed Kremenek // expressions that are not live (never used). 308882998923889a2fcce9b49696506c499e22cf38fTed Kremenek for (DeclStmt::const_decl_iterator DI=DS->decl_begin(), DE=DS->decl_end(); 30914f8b4ff660bcaa763974b8d0fae81857c594495Ted Kremenek DI != DE; ++DI) { 3101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3119c378f705405d37f49795d5e915989de774fe11fTed Kremenek VarDecl *V = dyn_cast<VarDecl>(*DI); 312fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek 313fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek if (!V) 314fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek continue; 315852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek 316852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek if (V->hasLocalStorage()) { 317852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek // Reference types confuse the dead stores checker. Skip them 318852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek // for now. 319852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek if (V->getType()->getAs<ReferenceType>()) 320852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek return; 321852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek 322bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (const Expr *E = V->getInit()) { 323bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek while (const ExprWithCleanups *exprClean = 324bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek dyn_cast<ExprWithCleanups>(E)) 325f85e193739c953358c865005855253af4f68a497John McCall E = exprClean->getSubExpr(); 326f85e193739c953358c865005855253af4f68a497John McCall 327bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek // Look through transitive assignments, e.g.: 328bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek // int x = y = 0; 329bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek E = LookThroughTransitiveAssignments(E); 330bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek 33143f19e3136a9610eeba3cdef9f9af70d93df2f7eTed Kremenek // Don't warn on C++ objects (yet) until we can show that their 33243f19e3136a9610eeba3cdef9f9af70d93df2f7eTed Kremenek // constructors/destructors don't have side effects. 33343f19e3136a9610eeba3cdef9f9af70d93df2f7eTed Kremenek if (isa<CXXConstructExpr>(E)) 33443f19e3136a9610eeba3cdef9f9af70d93df2f7eTed Kremenek return; 335604d939ac15d1398761df313679673d30bb10f27Ted Kremenek 336fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek // A dead initialization is a variable that is dead after it 337fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek // is initialized. We don't flag warnings for those variables 338fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek // marked 'unused'. 3392827f5af018c515986ffb1779ec2e7246988f150Ted Kremenek if (!isLive(Live, V) && V->getAttr<UnusedAttr>() == 0) { 340c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // Special case: check for initializations with constants. 341c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // 342c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // e.g. : int x = 0; 343c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // 344c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // If x is EVER assigned a new value later, don't issue 345c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // a warning. This is because such initialization can be 346c6a1fafe4289da10487799fc745eedc73dd8e5bcTed Kremenek // due to defensive programming. 3470e35b4ecee380c2b4c33d75da6bc2fb6f6bc7df3Richard Smith if (E->isEvaluatable(Ctx)) 348d3098ee64c069a3eff4d2d0a5d655d968c7b5dd2Ted Kremenek return; 3491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 350bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (const DeclRefExpr *DRE = 351bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek dyn_cast<DeclRefExpr>(E->IgnoreParenCasts())) 352bb811cab1bfa91074f1992b154fcb0c288e6eda3Ted Kremenek if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) { 353ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // Special case: check for initialization from constant 354ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // variables. 355ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // 356ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // e.g. extern const int MyConstant; 357ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // int x = MyConstant; 358ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // 359d3098ee64c069a3eff4d2d0a5d655d968c7b5dd2Ted Kremenek if (VD->hasGlobalStorage() && 360ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek VD->getType().isConstQualified()) 361ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek return; 362ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // Special case: check for initialization from scalar 363ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // parameters. This is often a form of defensive 364ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // programming. Non-scalars are still an error since 365ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // because it more likely represents an actual algorithmic 366ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek // bug. 367ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek if (isa<ParmVarDecl>(VD) && VD->getType()->isScalarType()) 368ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek return; 369ebd42f40803396d63bc59b77285d088cca61f53fTed Kremenek } 3701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 371590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks PathDiagnosticLocation Loc = 372590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks PathDiagnosticLocation::create(V, BR.getSourceManager()); 373590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks Report(V, DeadInit, Loc, E->getSourceRange()); 374ce1cab9fc0b4aec9cdef1b30a14e4ccdca3ac5f1Ted Kremenek } 375fc7ff5540412f8003024e1b4940fb8408dff2ca6Ted Kremenek } 376852274d4257134906995cb252fb3dfd2d71deae8Ted Kremenek } 377fdd225ed6f362a8550e597eb875d9c402b8a309cTed Kremenek } 3781ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek } 3791ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek}; 3801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3811ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek} // end anonymous namespace 3821ed6d2e4fda310af2de2ec09cdfedfa280cce948Ted Kremenek 383d2f642b56e87493edfc3b0dab359b5e32d5f8a5eTed Kremenek//===----------------------------------------------------------------------===// 384e207558e9dbed963eebf5cf31fdb02616f1545a3Ted Kremenek// Driver function to invoke the Dead-Stores checker on a CFG. 385e207558e9dbed963eebf5cf31fdb02616f1545a3Ted Kremenek//===----------------------------------------------------------------------===// 386e207558e9dbed963eebf5cf31fdb02616f1545a3Ted Kremenek 387f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremeneknamespace { 388ba5fb5a955c896815c439289fc51c03cf0635129Kovarththanan Rajaratnamclass FindEscaped : public CFGRecStmtDeclVisitor<FindEscaped>{ 389f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek CFG *cfg; 390f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenekpublic: 391f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek FindEscaped(CFG *c) : cfg(c) {} 3921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 393f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek CFG& getCFG() { return *cfg; } 3941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 395882998923889a2fcce9b49696506c499e22cf38fTed Kremenek llvm::SmallPtrSet<const VarDecl*, 20> Escaped; 396f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek 397f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek void VisitUnaryOperator(UnaryOperator* U) { 398f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek // Check for '&'. Any VarDecl whose value has its address-taken we 399f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek // treat as escaped. 4009c378f705405d37f49795d5e915989de774fe11fTed Kremenek Expr *E = U->getSubExpr()->IgnoreParenCasts(); 4012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (U->getOpcode() == UO_AddrOf) 4029c378f705405d37f49795d5e915989de774fe11fTed Kremenek if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E)) 4039c378f705405d37f49795d5e915989de774fe11fTed Kremenek if (VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) { 404f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek Escaped.insert(VD); 405f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek return; 406f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek } 407f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek Visit(E); 408f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek } 409f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek}; 410f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek} // end anonymous namespace 4111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 412f96f16d9f529ec95c20b9a91405653554e9646d1Ted Kremenek 4137dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis//===----------------------------------------------------------------------===// 4147dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis// DeadStoresChecker 4157dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis//===----------------------------------------------------------------------===// 4167dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis 4177dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidisnamespace { 418ec8605f1d7ec846dbf51047bfd5c56d32d1ff91cArgyrios Kyrtzidisclass DeadStoresChecker : public Checker<check::ASTCodeBody> { 4197dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidispublic: 4207dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis void checkASTCodeBody(const Decl *D, AnalysisManager& mgr, 4217dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis BugReporter &BR) const { 422a5937bbfd19e61d651a58b0f0ffeef68457902a5Ted Kremenek if (LiveVariables *L = mgr.getAnalysis<LiveVariables>(D)) { 4237dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis CFG &cfg = *mgr.getCFG(D); 4241d26f48dc2eea1c07431ca1519d7034a21b9bcffTed Kremenek AnalysisDeclContext *AC = mgr.getAnalysisDeclContext(D); 4257dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis ParentMap &pmap = mgr.getParentMap(D); 4267dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis FindEscaped FS(&cfg); 4277dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis FS.getCFG().VisitBlockStmts(FS); 428590dd8e0959d8df5621827768987c4792b74fc06Anna Zaks DeadStoreObs A(cfg, BR.getContext(), BR, AC, pmap, FS.Escaped); 429882998923889a2fcce9b49696506c499e22cf38fTed Kremenek L->runOnAllBlocks(A); 4307dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis } 4317dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis } 4327dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis}; 4337dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis} 4347dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis 4357dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidisvoid ento::registerDeadStoresChecker(CheckerManager &mgr) { 4367dd445ec20e704846cfbdb132e56539280d71311Argyrios Kyrtzidis mgr.registerChecker<DeadStoresChecker>(); 437d2f642b56e87493edfc3b0dab359b5e32d5f8a5eTed Kremenek} 438