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 // These checkers print various aspects of the ExprEngine's traversal of the CFG 11 // as it builds the ExplodedGraph. 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/CallEvent.h" 20 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 21 #include "llvm/Support/raw_ostream.h" 22 23 using namespace clang; 24 using namespace ento; 25 26 namespace { 27 class TraversalDumper : public Checker< check::BranchCondition, 28 check::BeginFunction, 29 check::EndFunction > { 30 public: 31 void checkBranchCondition(const Stmt *Condition, CheckerContext &C) const; 32 void checkBeginFunction(CheckerContext &C) const; 33 void checkEndFunction(CheckerContext &C) const; 34 }; 35 } 36 37 void TraversalDumper::checkBranchCondition(const Stmt *Condition, 38 CheckerContext &C) const { 39 // Special-case Objective-C's for-in loop, which uses the entire loop as its 40 // condition. We just print the collection expression. 41 const Stmt *Parent = dyn_cast<ObjCForCollectionStmt>(Condition); 42 if (!Parent) { 43 const ParentMap &Parents = C.getLocationContext()->getParentMap(); 44 Parent = Parents.getParent(Condition); 45 } 46 47 // It is mildly evil to print directly to llvm::outs() rather than emitting 48 // warnings, but this ensures things do not get filtered out by the rest of 49 // the static analyzer machinery. 50 SourceLocation Loc = Parent->getLocStart(); 51 llvm::outs() << C.getSourceManager().getSpellingLineNumber(Loc) << " " 52 << Parent->getStmtClassName() << "\n"; 53 } 54 55 void TraversalDumper::checkBeginFunction(CheckerContext &C) const { 56 llvm::outs() << "--BEGIN FUNCTION--\n"; 57 } 58 59 void TraversalDumper::checkEndFunction(CheckerContext &C) const { 60 llvm::outs() << "--END FUNCTION--\n"; 61 } 62 63 void ento::registerTraversalDumper(CheckerManager &mgr) { 64 mgr.registerChecker<TraversalDumper>(); 65 } 66 67 //------------------------------------------------------------------------------ 68 69 namespace { 70 class CallDumper : public Checker< check::PreCall, 71 check::PostCall > { 72 public: 73 void checkPreCall(const CallEvent &Call, CheckerContext &C) const; 74 void checkPostCall(const CallEvent &Call, CheckerContext &C) const; 75 }; 76 } 77 78 void CallDumper::checkPreCall(const CallEvent &Call, CheckerContext &C) const { 79 unsigned Indentation = 0; 80 for (const LocationContext *LC = C.getLocationContext()->getParent(); 81 LC != nullptr; LC = LC->getParent()) 82 ++Indentation; 83 84 // It is mildly evil to print directly to llvm::outs() rather than emitting 85 // warnings, but this ensures things do not get filtered out by the rest of 86 // the static analyzer machinery. 87 llvm::outs().indent(Indentation); 88 Call.dump(llvm::outs()); 89 } 90 91 void CallDumper::checkPostCall(const CallEvent &Call, CheckerContext &C) const { 92 const Expr *CallE = Call.getOriginExpr(); 93 if (!CallE) 94 return; 95 96 unsigned Indentation = 0; 97 for (const LocationContext *LC = C.getLocationContext()->getParent(); 98 LC != nullptr; LC = LC->getParent()) 99 ++Indentation; 100 101 // It is mildly evil to print directly to llvm::outs() rather than emitting 102 // warnings, but this ensures things do not get filtered out by the rest of 103 // the static analyzer machinery. 104 llvm::outs().indent(Indentation); 105 if (Call.getResultType()->isVoidType()) 106 llvm::outs() << "Returning void\n"; 107 else 108 llvm::outs() << "Returning " << C.getSVal(CallE) << "\n"; 109 } 110 111 void ento::registerCallDumper(CheckerManager &mgr) { 112 mgr.registerChecker<CallDumper>(); 113 } 114