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//===--- NonConstParameterCheck.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_READABILITY_NON_CONST_PARAMETER_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_NON_CONST_PARAMETER_H
#include "../ClangTidyCheck.h"
namespace clang::tidy::readability {
/// Warn when a pointer function parameter can be const.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/readability/non-const-parameter.html
class NonConstParameterCheck : public ClangTidyCheck {
public:
NonConstParameterCheck(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context) {}
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
void onEndOfTranslationUnit() override;
std::optional<TraversalKind> getCheckTraversalKind() const override {
return TK_IgnoreUnlessSpelledInSource;
}
private:
/// Parameter info.
struct ParmInfo {
/// Is function parameter referenced?
bool IsReferenced;
/// Can function parameter be const?
bool CanBeConst;
};
/// Track all nonconst integer/float parameters.
std::map<const ParmVarDecl *, ParmInfo> Parameters;
/// Add function parameter.
void addParm(const ParmVarDecl *Parm);
/// Set IsReferenced.
void setReferenced(const DeclRefExpr *Ref);
/// Set CanNotBeConst.
/// Visits sub expressions recursively. If a DeclRefExpr is found
/// and CanNotBeConst is true the Parameter is marked as not-const.
/// The CanNotBeConst is updated as sub expressions are visited.
void markCanNotBeConst(const Expr *E, bool CanNotBeConst);
/// Diagnose non const parameters.
void diagnoseNonConstParameters();
};
} // namespace clang::tidy::readability
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_NON_CONST_PARAMETER_H
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