//===--- UndefinedArraySubscriptChecker.h ----------------------*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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 "ClangSACheckers.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 = llvm::make_unique<BugReport>(*BT, BT->getName(), N);
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R->addRange(A->getIdx()->getSourceRange());
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bugreporter::trackNullOrUndefValue(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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