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