Coverage Report

Created: 2020-02-25 14:32

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/lib/StaticAnalyzer/Checkers/UndefinedArraySubscriptChecker.cpp
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//===--- UndefinedArraySubscriptChecker.h ----------------------*- C++ -*--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This defines UndefinedArraySubscriptChecker, a builtin check in ExprEngine
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// that performs checks for undefined array subscripts.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
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#include "clang/StaticAnalyzer/Core/Checker.h"
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#include "clang/StaticAnalyzer/Core/CheckerManager.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
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using namespace clang;
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using namespace ento;
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namespace {
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class UndefinedArraySubscriptChecker
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  : public Checker< check::PreStmt<ArraySubscriptExpr> > {
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  mutable std::unique_ptr<BugType> BT;
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public:
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  void checkPreStmt(const ArraySubscriptExpr *A, CheckerContext &C) const;
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};
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} // end anonymous namespace
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void
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UndefinedArraySubscriptChecker::checkPreStmt(const ArraySubscriptExpr *A,
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                                             CheckerContext &C) const {
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  const Expr *Index = A->getIdx();
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  if (!C.getSVal(Index).isUndef())
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    return;
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  // Sema generates anonymous array variables for copying array struct fields.
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  // Don't warn if we're in an implicitly-generated constructor.
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  const Decl *D = C.getLocationContext()->getDecl();
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  if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(D))
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    if (Ctor->isDefaulted())
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      return;
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  ExplodedNode *N = C.generateErrorNode();
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  if (!N)
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    return;
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  if (!BT)
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    BT.reset(new BuiltinBug(this, "Array subscript is undefined"));
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  // Generate a report for this bug.
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  auto R = std::make_unique<PathSensitiveBugReport>(*BT, BT->getDescription(), N);
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  R->addRange(A->getIdx()->getSourceRange());
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  bugreporter::trackExpressionValue(N, A->getIdx(), *R);
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  C.emitReport(std::move(R));
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}
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void ento::registerUndefinedArraySubscriptChecker(CheckerManager &mgr) {
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  mgr.registerChecker<UndefinedArraySubscriptChecker>();
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}
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bool ento::shouldRegisterUndefinedArraySubscriptChecker(const LangOptions &LO) {
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  return true;
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}