| //== 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 "ClangSACheckers.h" |
| #include "clang/StaticAnalyzer/Core/Checker.h" |
| #include "clang/StaticAnalyzer/Core/CheckerManager.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" |
| #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" |
| |
| using namespace clang; |
| using namespace ento; |
| |
| namespace { |
| class ReturnUndefChecker : |
| public Checker< check::PreStmt<ReturnStmt> > { |
| mutable OwningPtr<BuiltinBug> BT; |
| public: |
| void checkPreStmt(const ReturnStmt *RS, CheckerContext &C) const; |
| }; |
| } |
| |
| void ReturnUndefChecker::checkPreStmt(const ReturnStmt *RS, |
| CheckerContext &C) const { |
| |
| const Expr *RetE = RS->getRetValue(); |
| if (!RetE) |
| return; |
| |
| if (!C.getState()->getSVal(RetE, C.getLocationContext()).isUndef()) |
| return; |
| |
| ExplodedNode *N = C.generateSink(); |
| |
| if (!N) |
| return; |
| |
| if (!BT) |
| BT.reset(new BuiltinBug("Garbage return value", |
| "Undefined or garbage value returned to caller")); |
| |
| BugReport *report = |
| new BugReport(*BT, BT->getDescription(), N); |
| |
| report->disablePathPruning(); |
| report->addRange(RetE->getSourceRange()); |
| report->addVisitor(bugreporter::getTrackNullOrUndefValueVisitor(N, RetE, |
| report)); |
| |
| C.EmitReport(report); |
| } |
| |
| void ento::registerReturnUndefChecker(CheckerManager &mgr) { |
| mgr.registerChecker<ReturnUndefChecker>(); |
| } |