1 //===--- SignedCharMisuseCheck.h - clang-tidy -------------------*- C++ -*-===// 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 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNEDCHARMISUSECHECK_H 10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNEDCHARMISUSECHECK_H 11 12 #include "../ClangTidyCheck.h" 13 14 namespace clang { 15 namespace tidy { 16 namespace bugprone { 17 18 /// Finds those ``signed char`` -> integer conversions which might indicate a 19 /// programming error. The basic problem with the ``signed char``, that it might 20 /// store the non-ASCII characters as negative values. This behavior can cause a 21 /// misunderstanding of the written code both when an explicit and when an 22 /// implicit conversion happens. 23 /// 24 /// For the user-facing documentation see: 25 /// http://clang.llvm.org/extra/clang-tidy/checks/bugprone-signed-char-misuse.html 26 class SignedCharMisuseCheck : public ClangTidyCheck { 27 public: 28 SignedCharMisuseCheck(StringRef Name, ClangTidyContext *Context); 29 30 void storeOptions(ClangTidyOptions::OptionMap &Opts) override; 31 void registerMatchers(ast_matchers::MatchFinder *Finder) override; 32 void check(const ast_matchers::MatchFinder::MatchResult &Result) override; 33 34 private: 35 ast_matchers::internal::BindableMatcher<clang::Stmt> charCastExpression( 36 bool IsSigned, 37 const ast_matchers::internal::Matcher<clang::QualType> &IntegerType, 38 const std::string &CastBindName) const; 39 40 const std::string CharTypdefsToIgnoreList; 41 const bool DiagnoseSignedUnsignedCharComparisons; 42 }; 43 44 } // namespace bugprone 45 } // namespace tidy 46 } // namespace clang 47 48 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNEDCHARMISUSECHECK_H 49