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//===--- ProBoundsPointerArithmeticCheck.cpp - clang-tidy------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "ProBoundsPointerArithmeticCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace cppcoreguidelines {
void ProBoundsPointerArithmeticCheck::registerMatchers(MatchFinder *Finder) {
if (!getLangOpts().CPlusPlus)
return;
const auto AllPointerTypes =
anyOf(hasType(pointerType()),
hasType(autoType(
hasDeducedType(hasUnqualifiedDesugaredType(pointerType())))),
hasType(decltypeType(hasUnderlyingType(pointerType()))));
// Flag all operators +, -, +=, -=, ++, -- that result in a pointer
Finder->addMatcher(
binaryOperator(
hasAnyOperatorName("+", "-", "+=", "-="), AllPointerTypes,
unless(hasLHS(ignoringImpCasts(declRefExpr(to(isImplicit()))))))
.bind("expr"),
this);
Finder->addMatcher(
unaryOperator(hasAnyOperatorName("++", "--"), hasType(pointerType()))
.bind("expr"),
this);
// Array subscript on a pointer (not an array) is also pointer arithmetic
Finder->addMatcher(
arraySubscriptExpr(
hasBase(ignoringImpCasts(
anyOf(AllPointerTypes,
hasType(decayedType(hasDecayedType(pointerType())))))))
.bind("expr"),
this);
}
void ProBoundsPointerArithmeticCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("expr");
diag(MatchedExpr->getExprLoc(), "do not use pointer arithmetic");
}
} // namespace cppcoreguidelines
} // namespace tidy
} // namespace clang
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