xref: /llvm-project/clang-tools-extra/clang-tidy/modernize/UnaryStaticAssertCheck.cpp (revision 528447ff265a6c58b43af6cff2a3ee0ce5784331)
1 //===--- UnaryStaticAssertCheck.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 "UnaryStaticAssertCheck.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::modernize {
16 
registerMatchers(MatchFinder * Finder)17 void UnaryStaticAssertCheck::registerMatchers(MatchFinder *Finder) {
18   Finder->addMatcher(staticAssertDecl().bind("static_assert"), this);
19 }
20 
check(const MatchFinder::MatchResult & Result)21 void UnaryStaticAssertCheck::check(const MatchFinder::MatchResult &Result) {
22   const auto *MatchedDecl =
23       Result.Nodes.getNodeAs<StaticAssertDecl>("static_assert");
24   const auto *AssertMessage =
25       dyn_cast_if_present<StringLiteral>(MatchedDecl->getMessage());
26 
27   SourceLocation Loc = MatchedDecl->getLocation();
28 
29   if (!AssertMessage || AssertMessage->getLength() ||
30       AssertMessage->getBeginLoc().isMacroID() || Loc.isMacroID())
31     return;
32 
33   diag(Loc,
34        "use unary 'static_assert' when the string literal is an empty string")
35       << FixItHint::CreateRemoval(AssertMessage->getSourceRange());
36 }
37 
38 } // namespace clang::tidy::modernize
39