clang-tools 20.0.0git
TrailingReturnCheck.cpp
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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
10#include "clang/AST/ASTContext.h"
11#include "clang/ASTMatchers/ASTMatchFinder.h"
12#include "clang/ASTMatchers/ASTMatchersInternal.h"
13
14using namespace clang::ast_matchers;
15
16namespace clang::tidy::fuchsia {
17
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
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
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.