| 1 | //===--- AvoidPragmaOnceCheck.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 "AvoidPragmaOnceCheck.h" |
| 10 | |
| 11 | #include "clang/Basic/SourceManager.h" |
| 12 | #include "clang/Lex/PPCallbacks.h" |
| 13 | #include "clang/Lex/Preprocessor.h" |
| 14 | #include "llvm/ADT/StringRef.h" |
| 15 | |
| 16 | namespace clang::tidy::portability { |
| 17 | |
| 18 | class PragmaOnceCallbacks : public PPCallbacks { |
| 19 | public: |
| 20 | PragmaOnceCallbacks(AvoidPragmaOnceCheck *Check, const SourceManager &SM) |
| 21 | : Check(Check), SM(SM) {} |
| 22 | void PragmaDirective(SourceLocation Loc, |
| 23 | PragmaIntroducerKind Introducer) override { |
| 24 | auto Str = llvm::StringRef(SM.getCharacterData(SL: Loc)); |
| 25 | if (!Str.consume_front(Prefix: "#")) |
| 26 | return; |
| 27 | Str = Str.trim(); |
| 28 | if (!Str.consume_front(Prefix: "pragma")) |
| 29 | return; |
| 30 | Str = Str.trim(); |
| 31 | if (Str.starts_with(Prefix: "once")) |
| 32 | Check->diag(Loc, |
| 33 | Description: "avoid 'pragma once' directive; use include guards instead"); |
| 34 | } |
| 35 | |
| 36 | private: |
| 37 | AvoidPragmaOnceCheck *Check; |
| 38 | const SourceManager &SM; |
| 39 | }; |
| 40 | |
| 41 | void AvoidPragmaOnceCheck::registerPPCallbacks(const SourceManager &SM, |
| 42 | Preprocessor *PP, |
| 43 | Preprocessor *ModuleExpanderPP) { |
| 44 | PP->addPPCallbacks(C: std::make_unique<PragmaOnceCallbacks>(args: this, args: SM)); |
| 45 | } |
| 46 | |
| 47 | } // namespace clang::tidy::portability |
| 48 |