clang-tools-extra/clang-tidy/objc/DeallocInCategoryCheck.cpp

   1 //===--- DeallocInCategoryCheck.cpp - clang-tidy -------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "DeallocInCategoryCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/AST/DeclObjC.h"
  12 #include "clang/ASTMatchers/ASTMatchFinder.h"
  13
  14 using namespace clang::ast_matchers;
  15
  16 namespace clang {
  17 namespace tidy {
  18 namespace objc {
  19
  20 void DeallocInCategoryCheck::registerMatchers(MatchFinder *Finder) {
  21   // Non-NSObject/NSProxy-derived objects may not have -dealloc as a special
  22   // method. However, it seems highly unrealistic to expect many false-positives
  23   // by warning on -dealloc in categories on classes without one of those
  24   // base classes.
  25   Finder->addMatcher(
  26       objcMethodDecl(isInstanceMethod(), hasName("dealloc"),
  27                      hasDeclContext(objcCategoryImplDecl().bind("impl")))
  28           .bind("dealloc"),
  29       this);
  30 }
  31
  32 void DeallocInCategoryCheck::check(const MatchFinder::MatchResult &Result) {
  33   const auto *DeallocDecl = Result.Nodes.getNodeAs<ObjCMethodDecl>("dealloc");
  34   const auto *CID = Result.Nodes.getNodeAs<ObjCCategoryImplDecl>("impl");
  35   assert(DeallocDecl != nullptr);
  36   diag(DeallocDecl->getLocation(), "category %0 should not implement -dealloc")
  37       << CID;
  38 }
  39
  40 } // namespace objc
  41 } // namespace tidy
  42 } // namespace clang