1 //===--- UndefinedArraySubscriptChecker.h ----------------------*- 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 defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine
11 // that performs checks for undefined array subscripts.
13 //===----------------------------------------------------------------------===//
15 #include "ClangSACheckers.h"
16 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
17 #include "clang/StaticAnalyzer/Core/Checker.h"
18 #include "clang/StaticAnalyzer/Core/CheckerManager.h"
19 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
21 using namespace clang;
25 class UndefinedArraySubscriptChecker
26 : public Checker< check::PreStmt<ArraySubscriptExpr> > {
27 mutable OwningPtr<BugType> BT;
30 void checkPreStmt(const ArraySubscriptExpr *A, CheckerContext &C) const;
32 } // end anonymous namespace
35 UndefinedArraySubscriptChecker::checkPreStmt(const ArraySubscriptExpr *A,
36 CheckerContext &C) const {
37 const Expr *Index = A->getIdx();
38 if (!C.getSVal(Index).isUndef())
41 // Sema generates anonymous array variables for copying array struct fields.
42 // Don't warn if we're in an implicitly-generated constructor.
43 const Decl *D = C.getLocationContext()->getDecl();
44 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(D))
45 if (Ctor->isImplicitlyDefined())
48 ExplodedNode *N = C.generateSink();
52 BT.reset(new BuiltinBug("Array subscript is undefined"));
54 // Generate a report for this bug.
55 BugReport *R = new BugReport(*BT, BT->getName(), N);
56 R->addRange(A->getIdx()->getSourceRange());
57 bugreporter::trackNullOrUndefValue(N, A->getIdx(), *R);
61 void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) {
62 mgr.registerChecker<UndefinedArraySubscriptChecker>();