minix/external/bsd/llvm/dist/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp
Lionel Sambuc f4a2713ac8 Importing netbsd clang -- pristine
Change-Id: Ia40e9ffdf29b5dab2f122f673ff6802a58bc690f
2014-07-28 17:05:57 +02:00

64 lines
2.1 KiB
C++

//===--- UndefinedArraySubscriptChecker.h ----------------------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine
// that performs checks for undefined array subscripts.
//
//===----------------------------------------------------------------------===//
#include "ClangSACheckers.h"
#include "clang/AST/DeclCXX.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
using namespace clang;
using namespace ento;
namespace {
class UndefinedArraySubscriptChecker
: public Checker< check::PreStmt<ArraySubscriptExpr> > {
mutable OwningPtr<BugType> BT;
public:
void checkPreStmt(const ArraySubscriptExpr *A, CheckerContext &C) const;
};
} // end anonymous namespace
void
UndefinedArraySubscriptChecker::checkPreStmt(const ArraySubscriptExpr *A,
CheckerContext &C) const {
const Expr *Index = A->getIdx();
if (!C.getSVal(Index).isUndef())
return;
// Sema generates anonymous array variables for copying array struct fields.
// Don't warn if we're in an implicitly-generated constructor.
const Decl *D = C.getLocationContext()->getDecl();
if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(D))
if (Ctor->isDefaulted())
return;
ExplodedNode *N = C.generateSink();
if (!N)
return;
if (!BT)
BT.reset(new BuiltinBug("Array subscript is undefined"));
// Generate a report for this bug.
BugReport *R = new BugReport(*BT, BT->getName(), N);
R->addRange(A->getIdx()->getSourceRange());
bugreporter::trackNullOrUndefValue(N, A->getIdx(), *R);
C.emitReport(R);
}
void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) {
mgr.registerChecker<UndefinedArraySubscriptChecker>();
}