clang-tools-extra/clang-tidy/misc/UseAnonymousNamespaceCheck.cpp

   1 //===--- UseAnonymousNamespaceCheck.cpp - clang-tidy ----------------------===//
   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 #include "UseAnonymousNamespaceCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12
  13 using namespace clang::ast_matchers;
  14
  15 namespace clang::tidy::misc {
  16 namespace {
  17 AST_POLYMORPHIC_MATCHER_P(isInHeaderFile,
  18                           AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
  19                                                           VarDecl),
  20                           FileExtensionsSet, HeaderFileExtensions) {
  21   return utils::isExpansionLocInHeaderFile(
  22       Node.getBeginLoc(), Finder->getASTContext().getSourceManager(),
  23       HeaderFileExtensions);
  24 }
  25
  26 AST_MATCHER(FunctionDecl, isMemberFunction) {
  27   return llvm::isa<CXXMethodDecl>(&Node);
  28 }
  29 AST_MATCHER(VarDecl, isStaticDataMember) { return Node.isStaticDataMember(); }
  30 } // namespace
  31
  32 UseAnonymousNamespaceCheck::UseAnonymousNamespaceCheck(
  33     StringRef Name, ClangTidyContext *Context)
  34     : ClangTidyCheck(Name, Context),
  35       HeaderFileExtensions(Context->getHeaderFileExtensions()) {}
  36
  37 void UseAnonymousNamespaceCheck::registerMatchers(MatchFinder *Finder) {
  38   Finder->addMatcher(
  39       functionDecl(isStaticStorageClass(),
  40                    unless(anyOf(isInHeaderFile(HeaderFileExtensions),
  41                                 isInAnonymousNamespace(), isMemberFunction())))
  42           .bind("x"),
  43       this);
  44   Finder->addMatcher(
  45       varDecl(isStaticStorageClass(),
  46               unless(anyOf(isInHeaderFile(HeaderFileExtensions),
  47                            isInAnonymousNamespace(), isStaticLocal(),
  48                            isStaticDataMember(), hasType(isConstQualified()))))
  49           .bind("x"),
  50       this);
  51 }
  52
  53 void UseAnonymousNamespaceCheck::check(const MatchFinder::MatchResult &Result) {
  54   if (const auto *MatchedDecl = Result.Nodes.getNodeAs<NamedDecl>("x")) {
  55     StringRef Type = llvm::isa<VarDecl>(MatchedDecl) ? "variable" : "function";
  56     diag(MatchedDecl->getLocation(),
  57          "%0 %1 declared 'static', move to anonymous namespace instead")
  58         << Type << MatchedDecl;
  59   }
  60 }
  61
  62 } // namespace clang::tidy::misc