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1 //===--- ProBoundsPointerArithmeticCheck.cpp - clang-tidy------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "ProBoundsPointerArithmeticCheck.h"
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10 #include "clang/AST/ASTContext.h"
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11 #include "clang/ASTMatchers/ASTMatchFinder.h"
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12
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13 using namespace clang::ast_matchers;
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14
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15 namespace clang {
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16 namespace tidy {
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17 namespace cppcoreguidelines {
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18
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19 void ProBoundsPointerArithmeticCheck::registerMatchers(MatchFinder *Finder) {
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20 if (!getLangOpts().CPlusPlus)
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21 return;
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22
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23 const auto AllPointerTypes = anyOf(
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24 hasType(pointerType()), hasType(autoType(hasDeducedType(pointerType()))),
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25 hasType(decltypeType(hasUnderlyingType(pointerType()))));
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26
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27 // Flag all operators +, -, +=, -=, ++, -- that result in a pointer
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28 Finder->addMatcher(
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29 binaryOperator(
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30 hasAnyOperatorName("+", "-", "+=", "-="), AllPointerTypes,
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31 unless(hasLHS(ignoringImpCasts(declRefExpr(to(isImplicit()))))))
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32 .bind("expr"),
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33 this);
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34
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35 Finder->addMatcher(
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36 unaryOperator(hasAnyOperatorName("++", "--"), hasType(pointerType()))
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37 .bind("expr"),
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38 this);
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39
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40 // Array subscript on a pointer (not an array) is also pointer arithmetic
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41 Finder->addMatcher(
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42 arraySubscriptExpr(
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43 hasBase(ignoringImpCasts(
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44 anyOf(AllPointerTypes,
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45 hasType(decayedType(hasDecayedType(pointerType())))))))
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46 .bind("expr"),
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47 this);
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48 }
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49
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50 void ProBoundsPointerArithmeticCheck::check(
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51 const MatchFinder::MatchResult &Result) {
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52 const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("expr");
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53
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54 diag(MatchedExpr->getExprLoc(), "do not use pointer arithmetic");
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55 }
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56
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57 } // namespace cppcoreguidelines
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58 } // namespace tidy
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59 } // namespace clang
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