blob: 4beb4320e9e91d120f5a2a7890ed6a1504b81744 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
//===--- UnusedAliasDeclsCheck.cpp - clang-tidy----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "UnusedAliasDeclsCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace misc {
void UnusedAliasDeclsCheck::registerMatchers(MatchFinder *Finder) {
// Only register the matchers for C++11; the functionality currently does not
// provide any benefit to other languages, despite being benign.
if (!getLangOpts().CPlusPlus11)
return;
// We cannot do anything about headers (yet), as the alias declarations
// used in one header could be used by some other translation unit.
Finder->addMatcher(namespaceAliasDecl(isExpansionInMainFile()).bind("alias"),
this);
Finder->addMatcher(nestedNameSpecifier().bind("nns"), this);
}
void UnusedAliasDeclsCheck::check(const MatchFinder::MatchResult &Result) {
if (const auto *AliasDecl = Result.Nodes.getNodeAs<NamedDecl>("alias")) {
FoundDecls[AliasDecl] = CharSourceRange::getCharRange(
AliasDecl->getBeginLoc(),
Lexer::findLocationAfterToken(
AliasDecl->getEndLoc(), tok::semi, *Result.SourceManager,
getLangOpts(),
/*SkipTrailingWhitespaceAndNewLine=*/true));
return;
}
if (const auto *NestedName =
Result.Nodes.getNodeAs<NestedNameSpecifier>("nns")) {
if (const auto *AliasDecl = NestedName->getAsNamespaceAlias()) {
FoundDecls[AliasDecl] = CharSourceRange();
}
}
}
void UnusedAliasDeclsCheck::onEndOfTranslationUnit() {
for (const auto &FoundDecl : FoundDecls) {
if (!FoundDecl.second.isValid())
continue;
diag(FoundDecl.first->getLocation(), "namespace alias decl %0 is unused")
<< FoundDecl.first << FixItHint::CreateRemoval(FoundDecl.second);
}
}
} // namespace misc
} // namespace tidy
} // namespace clang
|
