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