| //===--- StringviewNullptrCheck.h - clang-tidy ------------------*- C++ -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_STRINGVIEWNULLPTRCHECK_H |
| #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_STRINGVIEWNULLPTRCHECK_H |
| |
| #include "../utils/TransformerClangTidyCheck.h" |
| |
| namespace clang { |
| namespace tidy { |
| namespace bugprone { |
| |
| /// Checks for various ways that the `const CharT*` constructor of |
| /// `std::basic_string_view` can be passed a null argument and replaces them |
| /// with the default constructor in most cases. For the comparison operators, |
| /// braced initializer list does not compile so instead a call to `.empty()` or |
| /// the empty string literal are used, where appropriate. |
| /// |
| /// This prevents code from invoking behavior which is unconditionally |
| /// undefined. The single-argument `const CharT*` constructor does not check |
| /// for the null case before dereferencing its input. The standard is slated to |
| /// add an explicitly-deleted overload to catch some of these cases: |
| /// wg21.link/p2166 |
| /// |
| /// To catch the additional cases of `NULL` (which expands to `__null`) and |
| /// `0`, first run the ``modernize-use-nullptr`` check to convert the callers |
| /// to `nullptr`. |
| /// |
| /// For the user-facing documentation see: |
| /// http://clang.llvm.org/extra/clang-tidy/checks/bugprone-stringview-nullptr.html |
| class StringviewNullptrCheck : public utils::TransformerClangTidyCheck { |
| public: |
| StringviewNullptrCheck(StringRef Name, ClangTidyContext *Context); |
| |
| bool isLanguageVersionSupported(const LangOptions &LangOpts) const override { |
| return LangOpts.CPlusPlus17; |
| } |
| }; |
| |
| } // namespace bugprone |
| } // namespace tidy |
| } // namespace clang |
| |
| #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_STRINGVIEWNULLPTRCHECK_H |