llvm-project

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//===--- MissingHashCheck.cpp - clang-tidy --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "MissingHashCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang::tidy::objc {
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namespace {
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AST_MATCHER_P(ObjCImplementationDecl, hasInterface,
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              ast_matchers::internal::Matcher<ObjCInterfaceDecl>, Base) {
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  const ObjCInterfaceDecl *InterfaceDecl = Node.getClassInterface();
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  return Base.matches(*InterfaceDecl, Finder, Builder);
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}
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AST_MATCHER_P(ObjCContainerDecl, hasInstanceMethod,
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              ast_matchers::internal::Matcher<ObjCMethodDecl>, Base) {
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  // Check each instance method against the provided matcher.
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  for (const auto *I : Node.instance_methods()) {
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    if (Base.matches(*I, Finder, Builder))
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      return true;
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  }
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  return false;
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}
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} // namespace
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void MissingHashCheck::registerMatchers(MatchFinder *Finder) {
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  Finder->addMatcher(
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      objcMethodDecl(
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          hasName("isEqual:"), isInstanceMethod(),
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          hasDeclContext(objcImplementationDecl(
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                             hasInterface(isDirectlyDerivedFrom("NSObject")),
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                             unless(hasInstanceMethod(hasName("hash"))))
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                             .bind("impl"))),
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      this);
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}
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void MissingHashCheck::check(const MatchFinder::MatchResult &Result) {
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  const auto *ID = Result.Nodes.getNodeAs<ObjCImplementationDecl>("impl");
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  diag(ID->getLocation(), "%0 implements -isEqual: without implementing -hash")
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      << ID;
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}
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} // namespace clang::tidy::objc
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