1 //===--- StaticDefinitionInAnonymousNamespaceCheck.cpp - clang-tidy--------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "StaticDefinitionInAnonymousNamespaceCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 #include "clang/Lex/Lexer.h"
14 
15 using namespace clang::ast_matchers;
16 
17 namespace clang {
18 namespace tidy {
19 namespace readability {
20 
21 void StaticDefinitionInAnonymousNamespaceCheck::registerMatchers(
22     MatchFinder *Finder) {
23   Finder->addMatcher(
24       namedDecl(anyOf(functionDecl(isDefinition(), isStaticStorageClass()),
25                       varDecl(isDefinition(), isStaticStorageClass())),
26                 hasParent(namespaceDecl(isAnonymous())))
27           .bind("static-def"),
28       this);
29 }
30 
31 void StaticDefinitionInAnonymousNamespaceCheck::check(
32     const MatchFinder::MatchResult &Result) {
33   const auto *Def = Result.Nodes.getNodeAs<NamedDecl>("static-def");
34   // Skips all static definitions defined in Macro.
35   if (Def->getLocation().isMacroID())
36     return;
37 
38   // Skips all static definitions in function scope.
39   const DeclContext *DC = Def->getDeclContext();
40   if (DC->getDeclKind() != Decl::Namespace)
41     return;
42 
43   auto Diag =
44       diag(Def->getLocation(), "%0 is a static definition in "
45                                "anonymous namespace; static is redundant here")
46       << Def;
47   Token Tok;
48   SourceLocation Loc = Def->getSourceRange().getBegin();
49   while (Loc < Def->getSourceRange().getEnd() &&
50          !Lexer::getRawToken(Loc, Tok, *Result.SourceManager, getLangOpts(),
51                              true)) {
52     SourceRange TokenRange(Tok.getLocation(), Tok.getEndLoc());
53     StringRef SourceText =
54         Lexer::getSourceText(CharSourceRange::getTokenRange(TokenRange),
55                              *Result.SourceManager, getLangOpts());
56     if (SourceText == "static") {
57       Diag << FixItHint::CreateRemoval(TokenRange);
58       break;
59     }
60     Loc = Tok.getEndLoc();
61   }
62 }
63 
64 } // namespace readability
65 } // namespace tidy
66 } // namespace clang
67