clang-tools  11.0.0
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 
11 using namespace clang::ast_matchers;
12 
13 namespace clang {
14 namespace tidy {
15 namespace fuchsia {
16 
17 namespace {
18 AST_MATCHER(Expr, isConstantInitializer) {
19  return Node.isConstantInitializer(Finder->getASTContext(), false);
20 }
21 
22 AST_MATCHER(VarDecl, isGlobalStatic) {
23  return Node.getStorageDuration() == SD_Static && !Node.isLocalVarDecl();
24 }
25 } // namespace
26 
27 void StaticallyConstructedObjectsCheck::registerMatchers(MatchFinder *Finder) {
28  // Constructing global, non-trivial objects with static storage is
29  // disallowed, unless the object is statically initialized with a constexpr
30  // constructor or has no explicit constructor.
31  Finder->addMatcher(
32  traverse(ast_type_traits::TK_AsIs,
33  varDecl(
34  // Match global, statically stored objects...
35  isGlobalStatic(),
36  // ... that have C++ constructors...
37  hasDescendant(cxxConstructExpr(unless(allOf(
38  // ... unless it is constexpr ...
39  hasDeclaration(cxxConstructorDecl(isConstexpr())),
40  // ... and is statically initialized.
41  isConstantInitializer())))))
42  .bind("decl")),
43  this);
44 }
45 
46 void StaticallyConstructedObjectsCheck::check(
47  const MatchFinder::MatchResult &Result) {
48  if (const auto *D = Result.Nodes.getNodeAs<VarDecl>("decl"))
49  diag(D->getBeginLoc(), "static objects are disallowed; if possible, use a "
50  "constexpr constructor instead");
51 }
52 
53 } // namespace fuchsia
54 } // namespace tidy
55 } // namespace clang
StaticallyConstructedObjectsCheck.h
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang::ast_matchers::AST_MATCHER
AST_MATCHER(Expr, isMacroID)
Definition: PreferIsaOrDynCastInConditionalsCheck.cpp:19
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27