1 | //===--- IncorrectEnableIfCheck.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 "IncorrectEnableIfCheck.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::bugprone { |
16 | |
17 | namespace { |
18 | |
19 | AST_MATCHER_P(TemplateTypeParmDecl, hasUnnamedDefaultArgument, |
20 | ast_matchers::internal::Matcher<TypeLoc>, InnerMatcher) { |
21 | if (Node.getIdentifier() != nullptr || !Node.hasDefaultArgument() || |
22 | Node.getDefaultArgument().getArgument().isNull()) |
23 | return false; |
24 | |
25 | TypeLoc DefaultArgTypeLoc = |
26 | Node.getDefaultArgument().getTypeSourceInfo()->getTypeLoc(); |
27 | return InnerMatcher.matches(Node: DefaultArgTypeLoc, Finder, Builder); |
28 | } |
29 | |
30 | } // namespace |
31 | |
32 | void IncorrectEnableIfCheck::registerMatchers(MatchFinder *Finder) { |
33 | Finder->addMatcher( |
34 | templateTypeParmDecl( |
35 | hasUnnamedDefaultArgument( |
36 | elaboratedTypeLoc( |
37 | hasNamedTypeLoc(templateSpecializationTypeLoc( |
38 | loc(InnerMatcher: qualType(hasDeclaration(InnerMatcher: namedDecl( |
39 | hasName(Name: "::std::enable_if" )))))) |
40 | .bind("enable_if_specialization" ))) |
41 | .bind("elaborated" ))) |
42 | .bind("enable_if" ), |
43 | this); |
44 | } |
45 | |
46 | void IncorrectEnableIfCheck::check(const MatchFinder::MatchResult &Result) { |
47 | const auto *EnableIf = |
48 | Result.Nodes.getNodeAs<TemplateTypeParmDecl>(ID: "enable_if" ); |
49 | const auto *ElaboratedLoc = |
50 | Result.Nodes.getNodeAs<ElaboratedTypeLoc>(ID: "elaborated" ); |
51 | const auto *EnableIfSpecializationLoc = |
52 | Result.Nodes.getNodeAs<TemplateSpecializationTypeLoc>( |
53 | ID: "enable_if_specialization" ); |
54 | |
55 | if (!EnableIf || !ElaboratedLoc || !EnableIfSpecializationLoc) |
56 | return; |
57 | |
58 | const SourceManager &SM = *Result.SourceManager; |
59 | SourceLocation RAngleLoc = |
60 | SM.getExpansionLoc(Loc: EnableIfSpecializationLoc->getRAngleLoc()); |
61 | |
62 | auto Diag = diag(EnableIf->getBeginLoc(), |
63 | "incorrect std::enable_if usage detected; use " |
64 | "'typename std::enable_if<...>::type'" ); |
65 | if (!getLangOpts().CPlusPlus20) { |
66 | Diag << FixItHint::CreateInsertion(InsertionLoc: ElaboratedLoc->getBeginLoc(), |
67 | Code: "typename " ); |
68 | } |
69 | Diag << FixItHint::CreateInsertion(InsertionLoc: RAngleLoc.getLocWithOffset(Offset: 1), Code: "::type" ); |
70 | } |
71 | |
72 | } // namespace clang::tidy::bugprone |
73 | |