clang-tools-extra/clang-tidy/llvmlibc/ImplementationInNamespaceCheck.cpp

   1 //===--- ImplementationInNamespaceCheck.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 "ImplementationInNamespaceCheck.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::llvm_libc {
  16
  17 const static StringRef RequiredNamespace = "__llvm_libc";
  18 void ImplementationInNamespaceCheck::registerMatchers(MatchFinder *Finder) {
  19   Finder->addMatcher(
  20       decl(hasParent(translationUnitDecl()), unless(linkageSpecDecl()))
  21           .bind("child_of_translation_unit"),
  22       this);
  23 }
  24
  25 void ImplementationInNamespaceCheck::check(
  26     const MatchFinder::MatchResult &Result) {
  27   const auto *MatchedDecl =
  28       Result.Nodes.getNodeAs<Decl>("child_of_translation_unit");
  29   if (!Result.SourceManager->isInMainFile(MatchedDecl->getLocation()))
  30     return;
  31
  32   if (const auto *NS = dyn_cast<NamespaceDecl>(MatchedDecl)) {
  33     if (NS->getName() != RequiredNamespace) {
  34       diag(NS->getLocation(), "'%0' needs to be the outermost namespace")
  35           << RequiredNamespace;
  36     }
  37     return;
  38   }
  39   diag(MatchedDecl->getLocation(),
  40        "declaration must be declared within the '%0' namespace")
  41       << RequiredNamespace;
  42 }
  43
  44 } // namespace clang::tidy::llvm_libc