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