1 //===--- TrailingReturnCheck.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 "TrailingReturnCheck.h" 10 #include "clang/AST/ASTContext.h" 11 #include "clang/ASTMatchers/ASTMatchFinder.h" 12 #include "clang/ASTMatchers/ASTMatchersInternal.h" 13 14 using namespace clang::ast_matchers; 15 16 namespace clang { 17 namespace tidy { 18 namespace fuchsia { 19 registerMatchers(MatchFinder * Finder)20void TrailingReturnCheck::registerMatchers(MatchFinder *Finder) { 21 // Functions that have trailing returns are disallowed, except for those 22 // using decltype specifiers and lambda with otherwise unutterable 23 // return types. 24 Finder->addMatcher( 25 functionDecl(hasTrailingReturn(), 26 unless(anyOf(returns(decltypeType()), 27 hasParent(cxxRecordDecl(isLambda())), 28 cxxDeductionGuideDecl()))) 29 .bind("decl"), 30 this); 31 } 32 check(const MatchFinder::MatchResult & Result)33void TrailingReturnCheck::check(const MatchFinder::MatchResult &Result) { 34 if (const auto *D = Result.Nodes.getNodeAs<FunctionDecl>("decl")) 35 diag(D->getBeginLoc(), 36 "a trailing return type is disallowed for this function declaration"); 37 } 38 39 } // namespace fuchsia 40 } // namespace tidy 41 } // namespace clang 42