forked from OSchip/llvm-project
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
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//===--- MisplacedArrayIndexCheck.cpp - clang-tidy-------------------------===//
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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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#include "MisplacedArrayIndexCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Tooling/FixIt.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace readability {
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void MisplacedArrayIndexCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(arraySubscriptExpr(hasLHS(hasType(isInteger())),
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hasRHS(hasType(isAnyPointer())))
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.bind("expr"),
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this);
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}
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void MisplacedArrayIndexCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *ArraySubscriptE =
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Result.Nodes.getNodeAs<ArraySubscriptExpr>("expr");
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auto Diag = diag(ArraySubscriptE->getLocStart(), "confusing array subscript "
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"expression, usually the "
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"index is inside the []");
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// Only try to fixit when LHS and RHS can be swapped directly without changing
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// the logic.
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const Expr *RHSE = ArraySubscriptE->getRHS()->IgnoreParenImpCasts();
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if (!isa<StringLiteral>(RHSE) && !isa<DeclRefExpr>(RHSE) &&
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!isa<MemberExpr>(RHSE))
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return;
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const StringRef LText = tooling::fixit::getText(
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ArraySubscriptE->getLHS()->getSourceRange(), *Result.Context);
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const StringRef RText = tooling::fixit::getText(
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ArraySubscriptE->getRHS()->getSourceRange(), *Result.Context);
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Diag << FixItHint::CreateReplacement(
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ArraySubscriptE->getLHS()->getSourceRange(), RText);
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Diag << FixItHint::CreateReplacement(
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ArraySubscriptE->getRHS()->getSourceRange(), LText);
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}
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} // namespace readability
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} // namespace tidy
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} // namespace clang
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