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//===--- 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 "InternalChecks.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerVisitor.h"
using namespace clang;
using namespace ento;
namespace {
class UndefinedArraySubscriptChecker
: public CheckerVisitor<UndefinedArraySubscriptChecker> {
BugType *BT;
public:
UndefinedArraySubscriptChecker() : BT(0) {}
static void *getTag() {
static int x = 0;
return &x;
}
void PreVisitArraySubscriptExpr(CheckerContext &C,
const ArraySubscriptExpr *A);
};
} // end anonymous namespace
void ento::RegisterUndefinedArraySubscriptChecker(ExprEngine &Eng) {
Eng.registerCheck(new UndefinedArraySubscriptChecker());
}
void
UndefinedArraySubscriptChecker::PreVisitArraySubscriptExpr(CheckerContext &C,
const ArraySubscriptExpr *A) {
if (C.getState()->getSVal(A->getIdx()).isUndef()) {
if (ExplodedNode *N = C.generateSink()) {
if (!BT)
BT = new BuiltinBug("Array subscript is undefined");
// Generate a report for this bug.
EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getName(), N);
R->addRange(A->getIdx()->getSourceRange());
R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue,
A->getIdx());
C.EmitReport(R);
}
}
}
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