1 //===--- UndefinedArraySubscriptChecker.h ----------------------*- C++ -*--===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine 11 // that performs checks for undefined array subscripts. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "ClangSACheckers.h" 16 #include "clang/StaticAnalyzer/Core/Checker.h" 17 #include "clang/StaticAnalyzer/Core/CheckerManager.h" 18 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 19 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" 20 21 using namespace clang; 22 using namespace ento; 23 24 namespace { 25 class UndefinedArraySubscriptChecker 26 : public Checker< check::PreStmt<ArraySubscriptExpr> > { 27 mutable llvm::OwningPtr<BugType> BT; 28 29 public: 30 void checkPreStmt(const ArraySubscriptExpr *A, CheckerContext &C) const; 31 }; 32 } // end anonymous namespace 33 34 void 35 UndefinedArraySubscriptChecker::checkPreStmt(const ArraySubscriptExpr *A, 36 CheckerContext &C) const { 37 if (C.getState()->getSVal(A->getIdx()).isUndef()) { 38 if (ExplodedNode *N = C.generateSink()) { 39 if (!BT) 40 BT.reset(new BuiltinBug("Array subscript is undefined")); 41 42 // Generate a report for this bug. 43 BugReport *R = new BugReport(*BT, BT->getName(), N); 44 R->addRange(A->getIdx()->getSourceRange()); 45 R->addVisitor(bugreporter::getTrackNullOrUndefValueVisitor(N, 46 A->getIdx())); 47 C.EmitReport(R); 48 } 49 } 50 } 51 52 void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) { 53 mgr.registerChecker<UndefinedArraySubscriptChecker>(); 54 } 55
