| //== ReturnUndefChecker.cpp -------------------------------------*- C++ -*--==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines ReturnUndefChecker, which is a path-sensitive |
| // check which looks for undefined or garbage values being returned to the |
| // caller. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ExprEngineInternalChecks.h" |
| #include "clang/EntoSA/BugReporter/BugType.h" |
| #include "clang/EntoSA/PathSensitive/CheckerVisitor.h" |
| #include "clang/EntoSA/PathSensitive/ExprEngine.h" |
| |
| using namespace clang; |
| using namespace ento; |
| |
| namespace { |
| class ReturnUndefChecker : |
| public CheckerVisitor<ReturnUndefChecker> { |
| BuiltinBug *BT; |
| public: |
| ReturnUndefChecker() : BT(0) {} |
| static void *getTag(); |
| void PreVisitReturnStmt(CheckerContext &C, const ReturnStmt *RS); |
| }; |
| } |
| |
| void ento::RegisterReturnUndefChecker(ExprEngine &Eng) { |
| Eng.registerCheck(new ReturnUndefChecker()); |
| } |
| |
| void *ReturnUndefChecker::getTag() { |
| static int x = 0; return &x; |
| } |
| |
| void ReturnUndefChecker::PreVisitReturnStmt(CheckerContext &C, |
| const ReturnStmt *RS) { |
| |
| const Expr *RetE = RS->getRetValue(); |
| if (!RetE) |
| return; |
| |
| if (!C.getState()->getSVal(RetE).isUndef()) |
| return; |
| |
| ExplodedNode *N = C.generateSink(); |
| |
| if (!N) |
| return; |
| |
| if (!BT) |
| BT = new BuiltinBug("Garbage return value", |
| "Undefined or garbage value returned to caller"); |
| |
| EnhancedBugReport *report = |
| new EnhancedBugReport(*BT, BT->getDescription(), N); |
| |
| report->addRange(RetE->getSourceRange()); |
| report->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, RetE); |
| |
| C.EmitReport(report); |
| } |