1 //== ReturnUndefChecker.cpp -------------------------------------*- C++ -*--==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines ReturnUndefChecker, which is a path-sensitive
11 // check which looks for undefined or garbage values being returned to the
14 //===----------------------------------------------------------------------===//
16 #include "ClangSACheckers.h"
17 #include "clang/StaticAnalyzer/Core/Checker.h"
18 #include "clang/StaticAnalyzer/Core/CheckerManager.h"
19 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
20 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
22 using namespace clang;
26 class ReturnUndefChecker :
27 public Checker< check::PreStmt<ReturnStmt> > {
28 mutable llvm::OwningPtr<BuiltinBug> BT;
30 void checkPreStmt(const ReturnStmt *RS, CheckerContext &C) const;
34 void ReturnUndefChecker::checkPreStmt(const ReturnStmt *RS,
35 CheckerContext &C) const {
37 const Expr *RetE = RS->getRetValue();
41 if (!C.getState()->getSVal(RetE).isUndef())
44 ExplodedNode *N = C.generateSink();
50 BT.reset(new BuiltinBug("Garbage return value",
51 "Undefined or garbage value returned to caller"));
53 EnhancedBugReport *report =
54 new EnhancedBugReport(*BT, BT->getDescription(), N);
56 report->addRange(RetE->getSourceRange());
57 report->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, RetE);
62 void ento::registerReturnUndefChecker(CheckerManager &mgr) {
63 mgr.registerChecker<ReturnUndefChecker>();