1 //== TraversalChecker.cpp -------------------------------------- -*- 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 checker prints branch statements to llvm::outs as they are encountered. 11 // This lets us see exactly how the ExprEngine is traversing the graph. 12 // 13 //===----------------------------------------------------------------------===// 14 #include "ClangSACheckers.h" 15 #include "clang/AST/ParentMap.h" 16 #include "clang/AST/StmtObjC.h" 17 #include "clang/StaticAnalyzer/Core/Checker.h" 18 #include "clang/StaticAnalyzer/Core/CheckerManager.h" 19 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 20 21 using namespace clang; 22 using namespace ento; 23 24 namespace { 25 class TraversalDumper : public Checker< check::BranchCondition, 26 check::EndPath > { 27 public: 28 void checkBranchCondition(const Stmt *Condition, CheckerContext &C) const; 29 void checkEndPath(CheckerContext &C) const; 30 }; 31 } 32 33 void TraversalDumper::checkBranchCondition(const Stmt *Condition, 34 CheckerContext &C) const { 35 // Special-case Objective-C's for-in loop, which uses the entire loop as its 36 // condition. We just print the collection expression. 37 const Stmt *Parent = dyn_cast<ObjCForCollectionStmt>(Condition); 38 if (!Parent) { 39 const ParentMap &Parents = C.getLocationContext()->getParentMap(); 40 Parent = Parents.getParent(Condition); 41 } 42 43 // It is mildly evil to print directly to llvm::outs() rather than emitting 44 // warnings, but this ensures things do not get filtered out by the rest of 45 // the static analyzer machinery. 46 SourceLocation Loc = Parent->getLocStart(); 47 llvm::outs() << C.getSourceManager().getSpellingLineNumber(Loc) << " " 48 << Parent->getStmtClassName() << "\n"; 49 } 50 51 void TraversalDumper::checkEndPath(CheckerContext &C) const { 52 llvm::outs() << "--END PATH--\n"; 53 } 54 55 void ento::registerTraversalDumper(CheckerManager &mgr) { 56 mgr.registerChecker<TraversalDumper>(); 57 } 58