forked from OSchip/llvm-project
83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
//===--- MiscStringCompare.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 "StringCompareCheck.h"
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#include "../utils/FixItHintUtils.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/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 misc {
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static const StringRef CompareMessage = "do not use 'compare' to test equality "
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"of strings; use the string equality "
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"operator instead";
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void StringCompareCheck::registerMatchers(MatchFinder *Finder) {
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if (!getLangOpts().CPlusPlus)
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return;
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const auto StrCompare = cxxMemberCallExpr(
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callee(cxxMethodDecl(hasName("compare"),
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ofClass(classTemplateSpecializationDecl(
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hasName("::std::basic_string"))))),
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hasArgument(0, expr().bind("str2")), argumentCountIs(1),
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callee(memberExpr().bind("str1")));
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// First and second case: cast str.compare(str) to boolean.
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Finder->addMatcher(implicitCastExpr(hasImplicitDestinationType(booleanType()),
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has(StrCompare))
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.bind("match1"),
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this);
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// Third and fourth case: str.compare(str) == 0 and str.compare(str) != 0.
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Finder->addMatcher(
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binaryOperator(anyOf(hasOperatorName("=="), hasOperatorName("!=")),
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hasEitherOperand(StrCompare.bind("compare")),
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hasEitherOperand(integerLiteral(equals(0)).bind("zero")))
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.bind("match2"),
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this);
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}
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void StringCompareCheck::check(const MatchFinder::MatchResult &Result) {
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if (const auto *Matched = Result.Nodes.getNodeAs<Stmt>("match1")) {
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diag(Matched->getLocStart(), CompareMessage);
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return;
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}
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if (const auto *Matched = Result.Nodes.getNodeAs<Stmt>("match2")) {
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const ASTContext &Ctx = *Result.Context;
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if (const auto *Zero = Result.Nodes.getNodeAs<Stmt>("zero")) {
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const auto *Str1 = Result.Nodes.getNodeAs<MemberExpr>("str1");
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const auto *Str2 = Result.Nodes.getNodeAs<Stmt>("str2");
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const auto *Compare = Result.Nodes.getNodeAs<Stmt>("compare");
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auto Diag = diag(Matched->getLocStart(), CompareMessage);
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if (Str1->isArrow())
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Diag << FixItHint::CreateInsertion(Str1->getLocStart(), "*");
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Diag << tooling::fixit::createReplacement(*Zero, *Str2, Ctx)
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<< tooling::fixit::createReplacement(*Compare, *Str1->getBase(),
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Ctx);
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}
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}
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// FIXME: Add fixit to fix the code for case one and two (match1).
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}
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} // namespace misc
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} // namespace tidy
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} // namespace clang
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