52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
//===--- TrailingReturnCheck.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 "TrailingReturnCheck.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/ASTMatchers/ASTMatchersInternal.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 fuchsia {
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namespace {
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AST_MATCHER(FunctionDecl, hasTrailingReturn) {
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return Node.getType()->castAs<FunctionProtoType>()->hasTrailingReturn();
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}
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} // namespace
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void TrailingReturnCheck::registerMatchers(MatchFinder *Finder) {
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// Requires C++11 or later.
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if (!getLangOpts().CPlusPlus11)
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return;
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// Functions that have trailing returns are disallowed, except for those
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// using decltype specifiers and lambda with otherwise unutterable
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// return types.
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Finder->addMatcher(
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functionDecl(hasTrailingReturn(),
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unless(anyOf(returns(decltypeType()),
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hasParent(cxxRecordDecl(isLambda())))))
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.bind("decl"),
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this);
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}
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void TrailingReturnCheck::check(const MatchFinder::MatchResult &Result) {
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if (const auto *D = Result.Nodes.getNodeAs<Decl>("decl"))
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diag(D->getBeginLoc(),
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"a trailing return type is disallowed for this type of declaration");
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}
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} // namespace fuchsia
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} // namespace tidy
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} // namespace clang
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