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//===--- StringReferenceMemberCheck.cpp - clang-tidy ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "StringReferenceMemberCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace google {
namespace runtime {
void StringReferenceMemberCheck::registerMatchers(
ast_matchers::MatchFinder *Finder) {
// Only register the matchers for C++; the functionality currently does not
// provide any benefit to other languages, despite being benign.
if (!getLangOpts().CPlusPlus)
return;
// Look for const references to std::string or ::string.
auto String = anyOf(recordDecl(hasName("::std::basic_string")),
recordDecl(hasName("::string")));
auto ConstString = qualType(isConstQualified(), hasDeclaration(String));
// Ignore members in template instantiations.
Finder->addMatcher(fieldDecl(hasType(references(ConstString)),
unless(isInstantiated())).bind("member"),
this);
}
void
StringReferenceMemberCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Member = Result.Nodes.getNodeAs<FieldDecl>("member");
diag(Member->getLocStart(), "const string& members are dangerous; it is much "
"better to use alternatives, such as pointers or "
"simple constants");
}
} // namespace runtime
} // namespace google
} // namespace tidy
} // namespace clang
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