1 //===--- StaticDefinitionInAnonymousNamespaceCheck.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 "StaticDefinitionInAnonymousNamespaceCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 #include "clang/Lex/Lexer.h"
13 
14 using namespace clang::ast_matchers;
15 
16 namespace clang {
17 namespace tidy {
18 namespace readability {
19 
20 void StaticDefinitionInAnonymousNamespaceCheck::registerMatchers(
21     MatchFinder *Finder) {
22   Finder->addMatcher(
23       namedDecl(anyOf(functionDecl(isDefinition(), isStaticStorageClass()),
24                       varDecl(isDefinition(), isStaticStorageClass())),
25                 hasParent(namespaceDecl(isAnonymous())))
26           .bind("static-def"),
27       this);
28 }
29 
30 void StaticDefinitionInAnonymousNamespaceCheck::check(
31     const MatchFinder::MatchResult &Result) {
32   const auto *Def = Result.Nodes.getNodeAs<NamedDecl>("static-def");
33   // Skips all static definitions defined in Macro.
34   if (Def->getLocation().isMacroID())
35     return;
36 
37   // Skips all static definitions in function scope.
38   const DeclContext *DC = Def->getDeclContext();
39   if (DC->getDeclKind() != Decl::Namespace)
40     return;
41 
42   auto Diag =
43       diag(Def->getLocation(), "%0 is a static definition in "
44                                "anonymous namespace; static is redundant here")
45       << Def;
46   Token Tok;
47   SourceLocation Loc = Def->getSourceRange().getBegin();
48   while (Loc < Def->getSourceRange().getEnd() &&
49          !Lexer::getRawToken(Loc, Tok, *Result.SourceManager, getLangOpts(),
50                              true)) {
51     SourceRange TokenRange(Tok.getLocation(), Tok.getEndLoc());
52     StringRef SourceText =
53         Lexer::getSourceText(CharSourceRange::getTokenRange(TokenRange),
54                              *Result.SourceManager, getLangOpts());
55     if (SourceText == "static") {
56       Diag << FixItHint::CreateRemoval(TokenRange);
57       break;
58     }
59     Loc = Tok.getEndLoc();
60   }
61 }
62 
63 } // namespace readability
64 } // namespace tidy
65 } // namespace clang
66