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//===--- UndefinedArraySubscriptChecker.h ----------------------*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine
// that performs checks for undefined array subscripts.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.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 std::unique_ptr<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.generateErrorNode();
if (!N)
return;
if (!BT)
BT.reset(new BuiltinBug(this, "Array subscript is undefined"));
// Generate a report for this bug.
auto R = std::make_unique<PathSensitiveBugReport>(*BT, BT->getDescription(), N);
R->addRange(A->getIdx()->getSourceRange());
bugreporter::trackExpressionValue(N, A->getIdx(), *R);
C.emitReport(std::move(R));
}
void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) {
mgr.registerChecker<UndefinedArraySubscriptChecker>();
}
bool ento::shouldRegisterUndefinedArraySubscriptChecker(const CheckerManager &mgr) {
return true;
}
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