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//===--- TrailingReturnCheck.cpp - clang-tidy------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "TrailingReturnCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchersInternal.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace fuchsia {
namespace {
AST_MATCHER(FunctionDecl, hasTrailingReturn) {
return Node.getType()->castAs<FunctionProtoType>()->hasTrailingReturn();
}
} // namespace
void TrailingReturnCheck::registerMatchers(MatchFinder *Finder) {
// Requires C++11 or later.
if (!getLangOpts().CPlusPlus11)
return;
// Functions that have trailing returns are disallowed, except for those
// using decltype specifiers and lambda with otherwise unutterable
// return types.
Finder->addMatcher(
functionDecl(hasTrailingReturn(),
unless(anyOf(returns(decltypeType()),
hasParent(cxxRecordDecl(isLambda())))))
.bind("decl"),
this);
}
void TrailingReturnCheck::check(const MatchFinder::MatchResult &Result) {
if (const auto *D = Result.Nodes.getNodeAs<Decl>("decl"))
diag(D->getBeginLoc(),
"a trailing return type is disallowed for this type of declaration");
}
} // namespace fuchsia
} // namespace tidy
} // namespace clang
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