clang-tools 20.0.0git
StaticallyConstructedObjectsCheck.cpp
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1//===--- StaticallyConstructedObjectsCheck.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
10
11using namespace clang::ast_matchers;
12
13namespace clang::tidy::fuchsia {
14
15namespace {
16AST_MATCHER(Expr, isConstantInitializer) {
17 return Node.isConstantInitializer(Finder->getASTContext(), false);
18}
19
20AST_MATCHER(VarDecl, isGlobalStatic) {
21 return Node.getStorageDuration() == SD_Static && !Node.isLocalVarDecl();
22}
23} // namespace
24
26 // Constructing global, non-trivial objects with static storage is
27 // disallowed, unless the object is statically initialized with a constexpr
28 // constructor or has no explicit constructor.
29 Finder->addMatcher(
30 traverse(TK_AsIs,
31 varDecl(
32 // Match global, statically stored objects...
33 isGlobalStatic(),
34 // ... that have C++ constructors...
35 hasDescendant(cxxConstructExpr(unless(allOf(
36 // ... unless it is constexpr ...
37 hasDeclaration(cxxConstructorDecl(isConstexpr())),
38 // ... and is statically initialized.
39 isConstantInitializer())))))
40 .bind("decl")),
41 this);
42}
43
45 const MatchFinder::MatchResult &Result) {
46 if (const auto *D = Result.Nodes.getNodeAs<VarDecl>("decl"))
47 diag(D->getBeginLoc(), "static objects are disallowed; if possible, use a "
48 "constexpr constructor instead");
49}
50
51} // namespace clang::tidy::fuchsia
::clang::DynTypedNode Node
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
AST_MATCHER(Decl, declHasNoReturnAttr)
matches a Decl if it has a "no return" attribute of any kind